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3800/3900/3900P Pulse Oximeter

1. Relocate the sensor to a site more shielded from light or reduce the amount of light shining on the sensor BUTTON STUCK Something is up against the front of Make sure nothing is pressing against a the oximeter button The last button you pressed has not Press the button again If it doesn t released properly or has been release cycle power If it doesn t release pressed for more than 30 seconds determine if the button pad needs to be cleaned or replaced section 5 2 Also see section 4 3 CHECK SENSOR SITE SpO readings may be invalid due to For all causes reposition or relocate the motion an unacceptable sensor site poor placement low perfusion or when the sensor is off the patient Detector failure sensor and or increase perfusion refer to the instructions for the sensor Replace sensor Clear Trend Data YES NO 3800 oximeter The alarm silence button is held down while you re turning on the 3800 pulse oximeter 3800 oximeter Press a high SpO alarm limit button or to clear trend data from memory YES Press a low pulse rate alarm limit button or to retain trend data in memory NO CONNECT UNIT TO LINE POWER The battery needs immediate recharging Plug the oximeter into the AC power supply otherwise the unit will turn itself off in 5 seconds INSUFFICIENT LIGHT Dirt on sensor emitter sensor detector or sensor site Insufficient light penetrating th
2. 1 6 phenol Sporicidin 3 4 glutaraldehyde Cidex Plus 2 Theory of Operations This chapter covers the theory of operations for the following components Power supply and power inlet module System board Switch board Oximetry board Passive filtering 3900P printer interface 21 Power supply and power inlet module The power supply converts power from an AC power source to 12 VDC It also provides the necessary isolation between the patient and the AC power supply It is connected to the system board for further conditioning The power inlet module contains the three contact power connector and the fuses Block diagram P inlet ff li itchi 12 VD To AC power supply i Ea E To system board 3800 3900 3900P Technical Reference Manual 22 System board The system board has two major components e Data management section Power management section System board functions e Condition power from the AC power supply and the battery e Charge the battery when supplied with a DC voltage from the power supply e Monitor language mode switch positions e Provide bi directional communication through the RS 232 connector e Send data to the front panel for display e Monitor front panel button presses e Allow for software upgrades e Monitor and send commands to the oximetry board via a serial interface and a few discrete digital lines e 3900 3900P Send analog SpO and pulse rate data to analog outputs 3900 390
3. NOTE Items 22 through 26 are used only in monitors without TruTrak The Sensor filter flex cable shown in section 6 8 is used in all TruTrak monitors 6 6 6 Illustrated Parts 6 2 2 Front panel assembly drawing 3800 ape 23 p 4 places d 18 20 21 4 places 2 places 2 places 15 2 places 6 7 3800 3900 3900P Technical Reference Manual 6 2 5 Front panel assembly drawing 3900 3900P 10 2 places f epe pd a ms ee 24 aue 2 places c 23 m 4 places d 25 rd T 20 4 places j 2 places 2 places 15 2 places 6 8 6 Illustrated Parts 63 Chassis assembly 6 3 1 Chassis components Item 1 Oo ON DN FW PD Description Oximeter cover with EMI seal for 3800 or 3900 Cover shield EMI used in 3800 REF 6051 0000 064 only Battery Screw ZnPl PPH M3 x 8 6 Loop fastener Interconnect from filter board Oximetry board Interconnect between system board and oximetry board Interconnect to 3900P printer board System board Interconnect to front panel board Chassis sheet metal Battery strap Extender feet 2 Hole plug not used in 3900P Feet with drive pin 2 Label serial number and product ID Nut ZnPI hex with lock washers M6 3 Equipotential ground lug Power inlet module Speaker Speaker O ring Power supply Split core cable ferrite with holder not used in 3800 REF 6051 0000 064 Hook fastener not used in 3800 REF 6051 0000 064 Loo
4. Power inlet MOCUIE cssscccsssssssssecccssssssssscccsssssssescessnnssesescessnnssssescessnnssseecconnsssseecessnsssses 6050 0005 310 Power supply 6050 0004 281 Pressure plate 3800 REF 6051 0000 064 Order Front bezel assembly 6050 0005 837 Pressure plate all monitors except 3800 REF 6051 0000 064 6050 0005 311 Pressure plate with foam Gaskets and EMI seal Attachment hardware Printer board with gasket kit 3900P eel 6050 0005 141 Printer bucket kit 3900P nette eaan im teer obe E 6050 0005 143 Printer button board kit 3900P n sssssssceccccessssssseesssesesceecesssssnsssneessssessceeseesessned 6050 0005 142 Printer cable printer to system board 3900P 6050 0005 101 Printer catch tray Kit 390OP escscccccossssessscccssnssssescccssnsseeccecssnssseeececsnnsssseeceessssees 6050 0005 046 Catch tray Nut 2 M3 locking Screw M3 x 8 STL ZnPI PPH FLH 2 Printer paper lid and tear bar kit 3900P eee 6050 0005 144 Printer upgrade kit for 3900 sssssssssccccsssssesescccssssssseececssnssseescecssnsseceeceesnnssseescesssssses 6050 0005 145 Cover with printer 3900P Printer cable Screw 2 M3 x 8 PHH FLH Catch tray Nut 2 M3 locking Upgrade instructions Printer paper 5 pk Replacement label Front bezel label 3900P Sensor connector Kit cccccsscssssssssssscsssssssssssssssssesssesssssssssssscsssssssecsscsss
5. blanks the display The user controls the contrast or viewing angle of the LCD by the position of potentiometer R6 The LED numeric displays are driven by an LED interface chip that is controlled by the system board over a synchronous serial interface The maximum intensity of the displays is set by a resistor One end of the resistor is controlled by a latch to allow the LEDs to be blanked when the latch is reset The alarm LED is bicolor red and yellow and is controlled by two bits of a latch The mains power indicator is a green LED that is lit when the oximeter is plugged into AC mains power The user interface switches are configured in a matrix and are scanned by the system board The power standby switch is a momentary contact switch that is wired through to the system board 2 Theory of Operations 24 Oximetry board The oximetry board has three major sections e Power supply Digital section e Analog section 24 1 Oximetry board power supply section The power supply section filters the V supply and provides V and Probe 5 IN is filtered by capacitors and inductors in a pi configuration V and Probe are generated on board by an inverting switching regulator This regulator uses current limited pulse frequency modulation The output is split into two supplies Probe is used to supply power to the sensor LEDs and V is used to provide power to the rest of the circuit The output is set to 5 V 2 4 2
6. e To avoid disconnecting the printer cable position the cover so that the tabs on each side of the cover are directly above the capture slots on the chassis 2 Grasp both sides of the cover near the lower front corners firmly pull outward Lower the cover until the tabs on each side of the cover drop into the slots on the chassis 3 Push the cover forward until it locks into place against the front panel 4 Reinstall the two screws that secure the cover to the rear of the chassis 5 To verify the software installation turn on the oximeter The version numbers for the installed system and oximetry software appear on the screen during the power on sequence 3900P If Model 3900 not Model 3900P is displayed when you turn on the 3900P you may have disconnected the printer cable while installing the cover To reconnect the cable e Turn off the oximeter e Remove the cover connect the cable to the printer board and reinstall the cover e Power on the oximeter and verify that Model 3900P is displayed Important Perform the Functional check section 3 1 and the Electrical safety check section 3 2 4 Troubleshooting This chapter contains 4 1 Messages An alphabetical list of the messages that may appear while using the oximeter and the 3900P printer A list of the error codes that appear with a SYSTEM FAILURE message A troubleshooting guide for the oximeter and the 3900P printer 3900 3900
7. German Italian Japanese Norwegian Portuguese Polish Spanish and Swedish French German Italian Japanese Portuguese Spanish and Swedish Averaging mode Long TruTrak 12 sec factory setting Medium 6 sec and Short 3 sec Long TruTrak 12 sec factory setting Medium 6 sec and Short 3 sec Patient mode Not applicable Adult factory setting and Neonate TruTrak monitors PI pulsatile value display Yes factory setting and No Yes factory setting and No Monitors without TruTrak SpO calibration Fractional factory setting and functional Fractional factory setting and functional EMI line frequency 60 Hz 60 Hz 1 Overview 1 3 3 Measurement SpO 2 TruTrak monitors Monitors without TruTrak Calibration Functional Fractional or Functional Range O to 100 0 to 100 Accuracy Arms 70 to 100 2 digits previously 70 to 100 3 digits during represented conditions of clinical patient by 1 SD motion with TruTrak enabled Below 70 unspecified Accuracy 1 SD 80 to 100 2 60 to 79 3 Below 60 unspecified Resolution 1 1 Pulse rate TruTrak monitors Monitors without TruTrak Range 30 to 250 bpm 20 to 255 bpm Accuracy 2 or 2 bpm whichever is 40 to 235 bpm 1 7 of assuming a greater reading constant Accuracy during conditions of pulse rate clinical patie
8. Oximetry board digital section The digital section contains the microprocessor the Flash code memory static random access memory SRAM a DAC an ADC and supporting logic All communication to the host system is through a serial interface and a few discrete digital lines Microprocessor The microprocessor is clocked at 7 3728 MHz It includes a 16 bit CPU an ADC a serial port timer counters and input output ports The high speed output port controls all oximetry timing signals RLT IRLT IR and RED for example In TruTrak monitors the microprocessor also includes Flash memory SRAM and a DAC Flash memory The Flash memory contains two major sections of code boot code and application code The application code performs oximetry In TruTrak monitors the Flash memory is internal to the microprocessor on the oximetry board SRAM The processor uses the SRAM for temporary storage of information No data are retained in this memory when power is disconnected from the board In TruTrak monitors the SRAM is internal to the microprocessor on the oximetry board DAC The D A converter is connected to an amplifier that scales and inverts the DAC output The range of the amplifier output is O to 2 5 V The DAC controls the current flow in the LEDs In TruTrak monitors the DAC is internal to the microprocessor on the oximetry board Reset circuit The reset circuit is an open collector topology to allow the microprocessor
9. PCA Drawings Service Kit 6 1 3800 3900 3900P Technical Reference Manual 6 1 Service kits 6 2 3800 3900 3900P PCA Drawings Service Kit 6050 0006 476 3800 Switch board schematic components 3900 3900P Switch board schematic components 3900P Printer board schematic components 3900P Printer button board schematic components Oximetry board schematic components Sensor filter board schematic components System board schematic components eXe im n p 6050 0004 277 Cable 3900 3900P MOdeM ANAIOG ccssssssssssssssssessesseessssssovsssnsssssscescessesstsonssssssssees 6050 0005 132 Cable 3900 3900P RS 232 serial sccccssscsssovsssssssssscescecssssssovsssussssescescessesstssnnssssssssees 6001 0000 181 Cable 3900 3900P serial analog 10 cm 4 inches black 6050 0005 131 Cable flex see Sensor filter flex cable Chassis base assembly with 3800 3900 lid sl 6050 0004 280 Cover kit 3800 and 3900 ccccssssssssccccssssessscecssssnssesescessnnsssseesessnnssssessessnnsseseesesannessseed 6050 0005 309 Cover EMI seal Replacement label Screw M3 x 8 STL ZnPI PFH 2 Cover kit 5900p 5 ototenatece teet test pete ote sse odi obedece ono 6050 0005 135 Cover EMI seal Replacement label Screw M3 x 8 STL ZnPI PFH 2 Equipotential ground connector ccssssssessecccsssssessecccsnns
10. Procedures This chapter provides procedures to e Verify that the oximeter and its buttons are functioning properly e 3900P Verify that the printer is functioning properly e Perform an electrical safety check Upgrade the software WARNING Patient safety Never test or perform maintenance on the oximeter while it is being used to monitor a patient NOTE Preventative maintenance and or calibration are not required for any 3800 3900 or 3900P monitor 3 1 Functional check WARNING Failure of operation If the oximeter fails any part of the checkout procedures or current leakage tests remove it from operation until qualified service personnel have corrected the situation WARNING Explosion hazard Do not use the monitor in the presence of any flammable anesthetic mixture WARNING Electrical shock hazard This equipment must be properly grounded e Electrical safety specifications e g current leakage and ground resistance can be assured only when the monitor is connected to a three wire grounded receptacle without the use of extension cords or adapters e If there is any doubt about the integrity of the AC power supply protective earth conductor operate the monitor on internal battery power e Because the unit is not grounded when it is operating on battery power do not connect any equipment to the RS 232 connector on the rear panel unless the unit is connected to the AC power supply 1 Inspect th
11. The printer prints a test sheet similar to the one shown below until you press the printer s stop button DATEX OHMEDA 3900P PRINTER SELF TEST PRESS STOP BUTTON TO STOP 123456789012345678901234567 ABCDEFGHIJKLMNOPQRSTUVWXYZ p0123456789 gt amp 2 Figure 3 1 Printer test sheet To stop the self test press Zu Verify that the header information prints correctly and that the text is legible If the self test was not successful replace the printer board see section 5 7 1 3 3 3800 3900 3900P Technical Reference Manual 3 1 2 Diagnostic self test The following self tests are performed during power on All external static RAM and the processors SIM RAM are completely tested for functionality FLASH ROM memory is CRC tested to verify unit software integrity User interface features switches display and audio are exercised in a prescribed manner A start up tone sequence that tests the audio circuit is followed by illumination of all display LEDs and the LCD backlight which are then blanked The alarm LED toggles between red and yellow while a numeric countdown from 9 to 0 occurs on each 7 segment LED display ending with a decimal point A battery icon appears on the mode status screen of the LCD to indicate the battery condition as follows Ww Fully charged JA low TX Depleted not installed or defective Oximeter circuit tests include supply and reference voltage checks followed by
12. and the oximetry board software can be upgraded Important 3800 If system board software version 2 0 or higher is not installed on your 3800 installation of the software upgrades listed below must be performed at a Datex Ohmeda service center only e System board software version 2 000 or higher e Oximetry board software version 3 000 or higher Upgrade kit contents The upgrade kit contains a jumper plug that is used for the 3900 3900P system software upgrade It also includes four software IC chips whose functions are described below IC Chip Software Upgrade Header J11 Model on System Board U LOADER System board YES Any 3800 3900 3900P containing this system board including all 3800 3900 3900P with TruTrak LOADER System board NO 3900 3900P without TruTrak SYS System board NO 3800 without TruTrak OXY Oximetry board Not applicable 3800 3900 3900P without TruTrak NOTE The system board in TruTrak monitors 6050 0005 742 is also used as the replacement board for any 3800 3900 3900P without TruTrak This board contains header J11 see Figure 3 2 which is not present on earlier system boards e If header J11 is on the system board in your monitor use the U LOADER chip e If header J11 is not on the system board in your 3900 3900P use the LOADER chip e f header J11 is not on the system board in your 3800 use the SYS chip Tools e Phillips screwdriver 1 e Flash IC ex
13. frequency The input stage of the circuit is a high pass filter at 5600 Hz followed by a low pass filter at 11 6 Hz Under classical filter analysis very little would be expected to pass through these filters However since this filter has a switching element frequencies that come through the high pass filter are aliased onto the low pass filter These aliased signals are amplified filtered detected and held The DC output of the circuit is compared to a fixed threshold to notify the processor of the presence of interference Multiplexed low pass filter Under normal operation the signal from the preamplifier is demultiplexed low pass filtered at 10 Hz and multiplexed A separate filter exists for each of the multiplexed signals Test circuit The signal into the multiplexed low pass filter can optionally be connected to a test signal The test signal is generated by the DAC which usually controls the LED intensity This signal is used to verify operation of the majority of the analog signal path by injecting a known signal Ambient light subtraction The signal during the dark time is subtracted from the signal while the red LED is on and while the infrared LED is on Composite gain stage The gain of this amplifier stage is controlled by the microprocessor and is optimized for the analog to digital converter The entire multiplexed signal is amplified by this stage Demultiplex and low pass filter The signals are demultiple
14. from the ground stud attached to the chassis and from the equipotential ground connector Slide the ground wires off Remove the two screws holding the power inlet module to the rear of the chassis Push the module out through the rear of the chassis Insert the new power inlet module into the rear of the chassis Reinstall the two screws that hold the module to the chassis Slide one ground wire connector from the module onto the ground stud and the other onto the equipotential ground connector Reinstall the nuts on the ground stud and equipotential ground connector e Make sure the captive washers point toward the rear of the chassis e Use the wrench to tighten the nuts securely Reconnect the blue brown primaries connector to J1 on the power supply Reconnect the green wire spade lug connector to the ground on the power supply Make sure there are two fuses in the power inlet module Replace the fuses if necessary see section 5 3 4 Reinstall the oximeter cover see section 5 1 2 Perform the Functional check section 3 1 and the Electrical safety check section 3 2 5 Repair and Replacement Procedures 5 3 4 Fuse replacement Tool Small flat blade screwdriver 5 mm 3 16 inch WARNING To protect against fire hazard replace only with fuses of the same type and voltage rating 1 2 7 Turn off the oximeter and unplug the power cord from the back of the oximeter Insert the small flat blade
15. on the system board refer to Figure 3 2 for the location of J11 e f necessary loosen the oximetry board by removing the four screws that hold the board to the standoffs Slowly lift the board until you can see the part of the system board where J11 is located NOTE If J11 is present a jumper will be installed on it for the 3800 a jumper is not installed on J11 for the 3900 3900P e Reinstall the four screws that secure the oximetry board to the standoffs Check to be sure all cables are securely fastened Connect the power cord to the oximeter 3 3 2 Optional Check the installed software versions You can determine if an upgrade is needed by checking the version number of the software that is currently installed on your oximeter 1 Turn on the oximeter The version numbers are displayed below the self test bar graph in this form Version X XXX YV VYY Note the version number of the installed software X XXX System software version number YY YYY oximetry software version number Turn off the oximeter If the installed software version is below the version shown on the corresponding IC chip upgrade the software 3 Test and Upgrade Procedures Front of Monitor 3 3 3 System software upgrade using the U LOADER or LOADER chip If you are upgrading the system software select the appropriate IC chip based on your monitor and the system board it contains e U LOADER use to upgrade a 3800 3900
16. one side of the motor to a ground potential The other side of the motor is tied to 5 V which allows the motor to run When the motor control signal from the microprocessor turns off the two transistor array turns on which shunts across the motor causing it to brake and stop quickly The motor is used to sweep the printhead across the paper Block diagram To microprocessor To keypads Motor driver Tachometer shaper The input to the tachometer circuit is a sinusoidal waveform The circuit on the printer board rectifies the signal then drives a transistor stage to deliver a square wave to the microprocessor This signal is an interrupt to the microprocessor Head drivers The eight printheads are thermal elements One side of each printhead is tied to 5 V The other side is selectively switched to ground under control of the microprocessor As a head is energized it heats up and exposes the thermal paper to produce a pixel dot The duty cycle at which the head is driven determines the lightness or darkness of the dot As the head moves across a line on the paper it synchronously prints a pattern of dots to represent text or graphic images ESD protection Two devices SP720 and SP721 were added to protect the signals from the microprocessor from being damaged by ESD discharge or over voltage stress These devices do not affect the performance of the circuits to which they are connected 2 Theory of Operations Tem
17. or 3900P whose system board contains header J11 e LOADER use to upgrade a 3900 or 3900P whose system board does not contain header J11 NOTE To upgrade a 3800 whose system board does not contain header J11 go to section 3 3 4 To upgrade the system software you install the appropriate IC chip on the system board then power on the unit to download the software 1 3900 3900P Install a jumper plug on J10 on the system board NOTE A jumper is not used when upgrading the 3800 system software 2 Locate the upgrade socket U19 on the system board near the rear of the monitor Oximetry Board O System Board JA Jumper J3 3900 3900P A Figure 3 2 Jumper plug upgrade socket and LOADER U LOADER IC chip 3 Carefully align the notch on the appropriate system software upgrade chip with the notch on socket U19 Then insert the chip into the socket 3 7 3800 3900 3900P Technical Reference Manual 3 8 4 Oo ss vsu Turn on the oximeter Messages similar to those shown below are displayed System Loader VX XXX NOTE 3900 3900P only If the jumper is Testing missing or incorrectly installed you will see the normal power on screens and Updating System to VX XXX messages The system software will not Size bytes XXXXX be upgraded Power off and begin again Press to begin gt starting with
18. repair procedures Give special attention to all warnings and cautions Important After repairs are complete test the unit as directed at the end of each procedure to verify that it is functioning properly 1 5 1 Cleaning You must clean the oximeter e Before you start any procedure that involves disassembly of the oximeter e Before you send the oximeter for repair CAUTION Cleaning e Do not autoclave pressure sterilize or gas sterilize the oximeter e Use cleaning solution sparingly Do not soak or immerse the monitor in liquid Excessive solution can flow into the monitor and damage internal components e When cleaning the display area do not use abrasive cleaning compounds or other materials that could damage the screen e Do not use petroleum based solutions acetone solutions or other harsh solvents to clean the oximeter These substances may damage the oximeter and cause a malfunction e To prevent damage to the 3900P printer do not allow cleaning solution to get into the printer mechanism 1 Turn off the oximeter and disconnect it from AC mains power 2 Gently wipe the display panel with a cotton swab moistened with isopropyl alcohol 70 vol 3 To clean the outer surface of the oximeter use a soft cloth dampened with a mild soap and water solution or one of the following solutions Mild detergent solution 0 5 sodium hypochlorite bleach 70 isopropyl alcohol Quarternary germicides Virex
19. step 1 The arrow means press the pulse rate low alarm limit button either side to start the system upgrade Updating System to VX XXX Size bytes XXXXX Erasing Updating System to VX XXX Size bytes XXXXX Programming XXXX Updated to Version VX 000 SUCCESS Cycle power NOTE Contact Datex Ohmeda to obtain a new upgrade chip if the upgrade does not proceed as described above and the CRC BAD or INCOMPATIBLE error message is displayed e CRC BAD indicates an incorrect or damaged IC chip e INCOMPATIBLE means the upgrade software is not compatible with your oximeter These errors do not affect the previously installed software You can stop the system upgrade and the monitor will return to its prior operating condition You may upgrade the oximetry software if you had planned to do so If either message appears turn off the oximeter Then go to step 6 When the Cycle power message is displayed turn off the oximeter Use an IC chip extraction tool to remove the IC chip from the socket 3900 3900P Remove the jumper plug from J10 Monitors without TruTrak To upgrade the oximetry software go to section 3 3 5 or Go to section 3 3 6 to install the cover and check the installation 3 Test and Upgrade Procedures Front of Monitor 3 3 4 System software upgrade using the SYS chip If the system board in your 3800 does not contain header J11 install the SYS chip on the system bo
20. the REMOTE COMPUTER or the WAIT FOR CALL option on the oximeter SEND screen is complete The modem disconnects the phone line Press 4t to return to the SEND screen TRANSMISSION ERROR A nonrecoverable error occurred during transmission of data to a remote computer This message indicates a problem with your modem the phone line the remote modem or the remote computer Check the connections setup and function of all these components WAITING FOR CALL The modem is waiting for an incoming call You may not use the 3900P printer while the modem is active To cancel the transmission press CANCEL 3800 3900 3900P Technical Reference Manual 4 4 2 TeleOximetry troubleshooting guide The situations listed below may occur while using a modem that is connected to the 3900 or 5900P NOTE Situations related to using the TeleOximetry PC Access software on your PC are described in the instructions located on the TeleOximetry CD Situation Cause Action No communication through the modem that is connected to the oximeter Incorrect cable used to connect modem to oximeter Modem is powered off or not properly connected Phone line failure Incorrect or improperly entered modem initialization string Your phone system may require a guard tone Mismatched baud rate Modem failure Use only the Datex Ohmeda modem analog cable Refer to section 6 1 Check and correct all modem
21. through the sensor filter board The photodetector signal is conditioned and processed on the oximetry board and the output is used to determine patient oxygen saturation perfusion and pulse rate The output is sent to the system board Sensor filter board This board filters out unwanted electrical signals EMC surges noise etc These are internal signals that should not leave the unit and external signals that should not enter the unit Front panel This panel displays information sent to it by the system board saturation pulse rate plethysmographic waveform alarm messages and alarm indicators The panel also contains the primary user interface switches It displays the AC power status and contains the power standby switch 3900P printer The printer board and printer button board interface to the system board The system board controls the 3900P printer to provide printed output of current monitoring data stored trend and summary data 3800 3900 3900P Technical Reference Manual 12 Compliance with standards Compliance with standards The presence on the monitor of any symbol described below indicates compliance with the standard represented by that symbol C C Medical Device Directive 93 42 EEC of the European Union for a class I with a measuring function Ila IIb or II device 0537 LR87853 Medical electrical equipment classified in the US and Canada with SP respect to electric shock fire and mechan
22. to activate the reset line The responsibility for reset control falls primarily on the host system 3800 3900 3900P Technical Reference Manual 2 4 3 Oximetry board analog section The analog section provides analog processing of the detector signal sensor LED drive detection of interfering signals and fault monitoring of the sensor It also has components to enhance electromagnetic compatibility and protect the board from electrostatic discharge Block diagram Sensor drive NC Red LED Constant From D A current Demux Photodetector control 50D U IR LED drive IR LED Red LP filter Preamp Ambient light subtraction es circuit FIRLP Ambient light filter LP filter Red channel Low pass filter and 0 45 Hz HP LP filter buffer filter and buffer Demux Mux Demux Analog Level Low pass filter and LP filter buffer 0 45 Hz HP filter and buffer IR channel Detector preamplifier The signal from the detector is converted to a voltage with a gain of about 49 900 uV uA The amplifier is in a balanced input configuration The gain rolls off at about 14 KHz Other components are added to reduce susceptibility to RF signals 2 Theory of Operations Interference detect The interference detection circuit selectively triggers on those signals with modulations or frequencies which would cause interference by aliasing with the oximeter s multiplexing
23. 0 OTP9 J5 O TP11 OTP16 wy O TP12 OTP15 RIS TP17 O OTP18 OTP19 O TP14 T200 J6 J7 J8 O TP21 SW1 6 Illustrated Parts 66 Oximetry board NOTE See section 4 5 2 for specific test point TP functions 6 6 1 Oximetry board layout TruTrak monitors J6 J7 Connector header shrouded 0 1 pitch 10 pin TruTrak flex cable P2 Connector header shrouded 2mm 20 pin system board J6 TP6 aL E 6 D sit gs TPB a ae O l o CAESUS o C Hl i TREE TP3 O RC pr p T4 O Or r2 i 6 15 3800 3900 3900P Technical Reference Manual 6 6 2 Oximetry board layout monitors without TruTrak J1 Connector header shrouded 0 1 pitch 10 pin sensor filter board P2 J2 Connector header shrouded 2mm 20 pin system board J6 JP1 Not used open TP24 O 1f 2 TP11 TP10 OO J2 C3 C2 C1 TP200 OEE TP1O JP f C6 C5 c4 B LLLELEL EIL LLLI B O TP18 TP21 ES T20 T20 O TP5 C TP6 TP19 TP13 O TP23 c8 C7 O TP7 O TP8 O TP9 O TP3 O O O P16 P14 O TP4 TP17 TP15 L O 6 16 6 Illustrated Parts 67 Switch board J1 S1 S2 S3 S4 S5 S6 S7 S8 S9 10 11 12 13 14 15 516 17 18 19 R6 W1 Connector female single row 19 pin bottom mount display board Not used not stuffed SPSTtactile PC mount alarm silence SPSTtactile PC mount pulse beat volume down SPSTtactile PC mount
24. 00P TruTrak should assure that it is used in such an environment Immunity test IEC 60601 test level Compliance level Electromagnetic environment guidance Portable and mobile RF communications equipment should be used no closer to any part of the 3800 3900 3900P TruTrak including cables than the recommended separation distance calculated from the equation applicable for the frequency of the transmitter Recommended Separation Distance Conducted RF 3 Vrms d 0 70 P IEC 61000 4 6 150 kHz to 80 MHz d 0 70 P 80 MHz to 800 MHz Radiated RF 3 V m IEC 61000 4 3 80 MHz to 2 5 GHz d 1 40 P 800 MHz to 2 5 GHz where P is the maximum output power rating of the transmitter in watts W according to the transmitter manufacturer and d is the recommended separation distance in meters m Field strengths from fixed RF transmitters as deter mined by an electromagnetic site survey should be less than the compliance level in each frequency range Interference may occur in the vicinity of equipment marked with the following symbol 3 NOTE 1 At 80 MHz and 800 MHz the separation distance for the higher frequency range applies NOTE2 These guidelines may not apply in all situations Electromagnetic propagation is affected by absorption and reflection from structures objects and people Field strengths from fixed transmitters such as base stations for radio cellular cordless telephones and land mobile radios amateur ra
25. 0P Provide real time clock capability e 3900P Provide control for printer output 2 2 1 System board data management The digital section of the system board provides data management The digital section contains the microprocessor SRAM Flash memory a software upgrade socket the RS 232 interface mode switches alarm signal generator audio amplifier microprocessor supervision 3900 3900P real time clock capability and 3900P printer interface Block diagram 3900 3900P Real time clock Static memory Flash memory Upgrade socket Alarm tone To oximetry board Speaker Mode switches Microprocessor supervisor Background debug RS 232 connector To front panel 3900P To printer board 2 Theory of Operations Microprocessor The microprocessor is a Motorola 68332 that operates at 16 MHz It uses a crystal that operates at 32 768 KHz Several ports can be configured by software A 16 channel timer processing unit can be programmed to execute various timing functions including a serial communication port A background debug feature allows full access to the processor through a 10 pin connector Communication to the oximetry board is accomplished primarily through a dedicated serial port SRAM The static RAM is 128 K x 8 bits The SRAM is powered when the unit is in standby mode which allows data to be retained when the digital system is powered down Flash memory and softw
26. 0P REF 6051 0000 124 6050 0005 023 Bezel with label foot strip EMI seal Attachment hardware Front bezel assembly 3900P with TruTrak REF 6051 0000 167 6050 0006 537 Bezel with label foot strip EMI seal Attachment hardware Fuse T2 0AH 250V 5 mm x 20 mm 1 teeteeeennnnnnnnncnd 6090 0409 019 Hardware Kit ettet reote ecce oce ice e voee 6050 0005 136 Fuse 2 Battery strap Foot strip Rear feet 2 Screw STL ZnPI PFH M3 x 8 9 Screw STL ZnPI PPH M3 x 8 10 Screw STL ZnPI PPH M3 x 16 6 Serial jack nut 2 Spacer 2 Nut SST Kep M6 3 Nut M3 locking 2 6 3 3800 3900 3900P Technical Reference Manual 6 4 IC chip extraction tool PLCC extractor sssssssssssssssssssssssssssssssssssssssssssssssssssssssssssse 0380 1500 124 Keypad button kit 3800 cccccsssssssssecccssssesseccessnsssssscccsnnssesescesssnssssescesnnssseecessesssees 6050 0003 759 Volume Limits Alarm and Power buttons Keypad button kit 3900 3900P sssssssssssssssssssssessessssseseereeseeseeseeseeeeesensensensensensense 6050 0005 139 Volume Menu Limits Alarm Power and Printer buttons CD assemibly eiie i ibis tede ss dua 6050 0004 279 Oximetry board monitors without TruTrak eel 6050 0005 022 Oximetry board TruTrak monitors ee ee treeeeennsnoceeee 6050 0006 532 Power DUTON ces laetus m duet uc ECL S al 6050 0003 750
27. 1 3 7 RS 232 connector Connector type 9 pin standard D female 3900 3900P pins 1 and 4 are not used 3800 pins 1 4 6 and 9 are not used Serial output RS 232 2 oximeter receives data 1 3 oximeter transmits data 2 5 signal ground o Cy o 7 RTS Request To Send 8 CTS Clear To Send Data output every 2 seconds auto output mode or 6 seconds trend output mode All monitors SpO2 pulse rate alarm limit violation messages and displayed alarm messages 3900 3900P Relative Perfusion Index time stamp and custom patient label Baud rate 3800 9600 baud 3900 3900P 9600 19 2 K 38 4 K or 57 6 K baud Full duplex no parity 8 bits per character 1 start bit 1 stop bit Handshaking CTS RTS 3900 3900P Analog output RS 232 9 7 signal ground Ca 6 SpO 0 to 1 Vdc 20 mV 0 to 10096 2 0 o Gey o 9 Pulse rate 0 to 1 Vdc 20 mV 0 to 255 bpm 2 0 1 13 3800 3900 3900P Technical Reference Manual 14 Precautions Two types of precautions appear in this manual Warnings and cautions e AWARNING indicates the possibility of injury to the patient or operator e ACAUTION indicates a condition that may cause equipment damage or malfunction 3900 3900P If you connect a modem refer to the precautions contained in the instructions that accompanied your modem 14 1 Warnings Battery replacement To ensure proper operation replace only with the recommended battery Fai
28. 5 C 4 to 113 F Relative humidity 20 to 95 5 to 95 noncondensing Pressure 1060 to 697 hPa 1060 to 188 hPa Approximate 378 to 3048 m 378 to 12 2 km elevation 1240 to 10 000 ft 1240 to 40 000 ft 1 5 6 Electrical Power Consumption typical 15 watts 3900P 20 watts Input voltage range 90 to 264 VAC at 47 63 Hz Current typical 0 45 Arms at 100 V 0 37 Arms at 120 V 0 25 Arms at 220 230 240 V Current leakage With power on forward or reverse polarity 100 microamperes maximum Ground resistance less than 0 1 Q Fuse T2 0AH 250V 5mm OD x 20 mm Length 1 12 1 Overview Battery Tupe 8 volt sealed lead acid Capacity 3 2 ampere hours Operation time for a new battery at normal operating temperatures At least 5 1 2 hours with all functions operative from a fully charged battery 3900P approximately 4 hours when printing Low battery indicator LOW BATTERY indicates the remaining battery capacity is between 5 and 15 minutes Important To prevent permanent damage to the battery recharge a discharged battery within eight hours after LOW BATTERY is displayed Charge time 4 hours 8096 capacity 8 hours 100 capacity Life several hundred charge discharge cycles Shelf life 6 months maximum if not recharged when stored at room temperature batteries stored for extended periods of time should be recharged every six months to maintain the charging capacity
29. 5 cycles 596U gt 95 96 dip in U for 5 sec 6 kV contact x 8 kV air 2 kV for power supply lines 1 kV for input output lines x 1 kV differential mode x 2 kV common mode 596U gt 95 96 dip in U for 0 5 cycle 40 96 U 60 96 dip in U for 5 cycles 70 96 U 30 96 dip in U for 25 cycles 596U gt 95 96 dip in U for 5 sec Floors should be wood concrete or ceramic tile If floors are covered with synthetic material the relative humidity should be at least 30 Mains power quality should be that of a typical commercial or hospital environment Mains power quality should be that of a typical commercial or hospital environment Mains power quality should be that of a typical commercial or hospital environment If the user of the 3800 3900 3900P TruTrak requires continued operation during power mains interruptions it is recommended that the 3800 3900 3900P TruTrak be powered from an uninterruptible power supply or a battery Power frequency magnetic fields should be at levels characteristic of a typical location in a typical commercial or hospital environment NOTE U is the a c mains voltage prior to application of the test level 1 Overview Table 1 3 Guidance and manufacturer s declaration electromagnetic Immunity The 3800 3900 3900P TruTrak is intended for use in the electromagnetic environment specified below The customer or the user of the 3800 3900 39
30. 7 str 2mm P PCB system board J9 J2 Connector header 1 x 5 rt angle PCB mt printer tach motor connector J3 Connector header shrouded 1 x 9 str 0 1 in P flex ckt th printer head leads J4 Connector header shrouded 1 x 2 rt angle 2mm P PCB mt printer button board P1 Q O J4 J3 J1 J2 O O 6 9 2 3900P Printer button board J1 Connector 0 1 pitch not stuffed hard soldered wires to P1 P1 Connector 2 wire 2mm printer board J4 6 19 3800 3900 3900P Technical Reference Manual 6 20
31. AC signal Red DC signal Infrared DC signal LED sense RED LIGHT LED sense RED DARK LED sense IR LIGHT LED sense IR DARK Filtered preamp output Analog ground Plus V supply rail Reference voltage Detector preamp output Analog ground Minus V supply rail m nim Q Oo0 o0 o u Alwin e Anodes 2 10 2 Theory of Operations LED drive The LED drive currents are controlled by a DAC connected to the microprocessor The anodes of the LEDs are common and connected to ground through a current sense resistor and switch Each LED has a drive transistor that controls the current in the LED The current for the LED being driven is part of a feedback loop that holds the current relatively constant The voltages across the LEDs during different phases of drive are fed into the analog multiplexor These voltages are monitored for various fault conditions that may exist in the sensor Sensor monitor The LED current is monitored by the sensor monitor The voltage across the resistor that connects the anodes to ground is amplified by a factor of 50 and low passed at 2 Hz The overall LED current is monitored by the microprocessor The LEDs can be disconnected from ground by the microprocessor via the FET in series with the anodes Sensor identification Certain LED characteristics are identified via a resistor in the sensor This resistor value is determined by a res
32. Button pad replacement If a button pad has become torn too dirty to properly clean or otherwise damaged you can replace the button pad However if a button switch on the switch board is broken you must replace the switch board see section 5 2 6 Each button pad power alarm volume and limits sits on small posts that hold it against the front bezel 1 Gently pull the button pad straight up until it is free of the posts 2 To install the new button pad align the small holes in the pad with the matching posts and firmly press it into place 5 Repair and Replacement Procedures 5 2 6 Switch board replacement NOTE These instructions are not applicable to the 3800 REF 6051 0000 064 1 2 8 Make sure the button pads are properly seated on their retaining posts Make sure the viewing contrast slider on the switch board is pushed to the far edge of the board Insert the viewing contrast slider carefully down through the slot in the front bezel above the power button Place the new switch board flush against the front bezel Place the two standoffs between the pressure plate and the switch board Then place the pressure plate over the switch board with the foam side against the board Before reinstalling the screws on either side of the pressure plate which also secure the switch board turn the bezel over and make sure the viewing contrast slider is through the slot and visible on the outside of the bezel
33. Ces a eei pesa esaet delent adde Background debug 3900 3900P Real time clock 3900P Printer interface System board power management e ssttteeentttttnnnnnettns 525 M SU D DUIS e ede tee tete tete eed e t ten bte tute E Battery charger Battery monitor AC monitor PAR UDDU icto ER aren d t teen dise ated ique e mites Power on standbi Cir CultrU eee eee est aee redet 244 Oximetru bodrd eit n ee o es leb lae epe pesce a 2 4 1 2 4 2 2 4 5 25 Passive filtering sensor filter board or flex cable Oximetry board power supply section eee Oximetry board digital section steer MIEKOPEOCESS OM utt teorie tete eet eee etel dolens Flash memory Oximetry board analog section seeeeettttentnnttnn Detector prearmiplifier ete tee ee eR tes Interference detect oe ettet pee itn Multiplexed low pass filter TOS CIRCUIT oett ep Ee ORDRE AERA ERIT QUA HERBA eR ee Ambient light s btraction eet tette eite Comiposite galn Stage diet tie ee dte ti ete dere dtd Demultiplex and low pass filter eerte High pass filter and multiplex AC galnistage couette t ibd tela de e etn De tri ltiplex OW DOSSs cs itecto e rented be nite eines Analog multiplexor and buffer Multiplexor LED drive E T aL To Bie nroin iro Sensor Identification as oet aee ael 2 6 3900P Printer interface uu sccs
34. GE Healthcare 3800 3900 3900P Pulse Oximeter With Without TruTrak Technical Reference Manual 3800 5 o ine TruTrak oO TruTrak GE Healthcare 3800 3900 3900P Pulse Oximeter With Without TruTrak Technical Reference Manual 3800 5 o ine TruTrak JO TruTrak 6050 0006 404 March 2005 Important Rx Only USA Attention Consult the accompanying instructions including all safetu precautions before using or servicing this device Responsibility of the manufacturer The safety reliability and performance of this device can be assured only under the following conditions e Fittings extensions readjustments changes or repairs are carried out by authorized personnel e The electrical installation complies with relevant standards and regulations e The device is used according to the accompanying operating instructions and is serviced and maintained in accordance with this manual Service and repair Service and repair procedures must be performed by authorized service personnel Repair this device or its parts only in accordance with instructions provided by the manufacturer To order replacement parts or for assistance contact an authorized service office When shipping the monitor for repair clean the monitor allow it to dry completely and pack it for shipment in the original shipping
35. P TeleOximetry messages and troubleshooting guide Test points on the System and Oximetry boards The following chart alphabetically lists the messages that may appear on the oximeter why the message appears and the action s to take if the message indicates a problem NOTE Messages that may be displayed while using the 3900 3900P TeleOximetry feature are described in section 4 4 Message Cause Action X Appears in the graphic display alarm limit area The all mute feature is activated No action required Press the alarm silence button once to deactivate vi Appear on status screen Indicates a fully charged battery Indicates a low charged battery during power on sequence and on right side of LCD during battery operation No action required To recharge plug the unit into AC mains power XJ Appears on status screen Indicates battery failure a depleted battery or a missing battery during power on sequence To recharge plug the unit into AC mains power If the condition persists the unit requires service ES Appears in the graphic display message area The alarm or pulse tone volume is being adjusted No action required To adjust audio volume refer to the User s Manual 4 1 3800 3900 3900P Technical Reference Manual Message Cause Action AMBIENT LIGHT Excessive ambient light
36. Reinstall the two screws going through the standoffs that hold the pressure plate and switch board to the front bezel Check all button pads for proper orientation alignment and function 5 2 7 Front panel reassemble and reinstall NOTE Reassembly depends on the part s you replaced Assuming you completely disassembled the front panel all the steps needed to reassemble the panel and attach it to the chassis are provided below begin where appropriate Complete steps 1 through 8 if the switch board is not installed otherwise start with step 9 1 Make sure the button pads are properly seated on their retaining posts 2 Make sure the viewing contrast slider on the switch board is pushed to the far edge of the board 3 Insert the viewing contrast slider carefully down through the slot in the front bezel above the power button 4 Place the switch board flush against the front bezel 5 Place the two standoffs between the pressure plate and the switch board Then place the pressure plate over the switch board with the foam side against the board 6 Before reinstalling the screws on either side of the pressure plate which also secure the switch board turn the bezel over and make sure the viewing contrast slider is through the slot and visible on the outside of the bezel 7 Reinstall the two screws going through the standoffs that hold the pressure plate and switch board to the front bezel Check all button pads for prop
37. a test signal generated by the sensor LED drive circuit which is routed through the oximetry signal path to check for errors and verify calibration The resultant calculated value which is sensitive to both offset and phase errors in the circuitry is compared to established criteria 3 2 Electrical safety check Perform this test after removing the oximeter cover to perform any service procedure 3 4 WARNING Measure the leakage current in accordance with applicable standards after completing any repair procedure 1 With the power cord connected only to the oximeter measure the resistance from the power plug ground connector to all exposed metal on the chassis The measured resistance must not exceed 0 15 Q Measure the leakage current following the instructions supplied with the leakage current tester Record the results for reference in future resistance leakage tests A significant change may indicate a pending failure 3 Test and Upgrade Procedures 3 3 Software upgrade An IC integrated circuit chip is used to upgrade software The IC chip is inserted into a Socket on the system board During the upgrade the software is sent from the IC chip to the system board or oximetry board for monitors without TruTrak e TruTrak4 monitors The system board software can be upgraded An oximetry board software upgrade is not available for TruTrak monitors e Monitors without TruTrak The system board software
38. action tool to remove the IC chip from the socket To upgrade the oximetry software go to section 3 3 5 or Go to section 3 3 6 to install the cover and check the installation 3 Test and Upgrade Procedures 3 3 5 Oximetry software upgrade monitors without TruTrak To upgrade the oximetry software you install the OXY Y YYY IC chip on the system board and power on the unit to download the software to the oximetry board Front of Monitor 1 Locate the upgrade socket U19 on the system board near the rear o Oximetry Board Figure 3 4 Upgrade socket and OXY IC chip f the monitor O System Board J4 J3 mas i J10 IC Chip U19 JT J8 2 Carefully align the notch on upgrade chip OXY Y VYY with the notch on socket U19 Then insert the chip into the socket 3 Turn on the oximeter Messages similar to those listed below are displayed Oximetry Download in Progress Progress Erasing Retries XX Oximetry Download in Progress Progress XX96 Retries XX CYCLE POWER Progress 10096 Retries XX Updated to Ver Y VYY 3900 3900P If a jumper is installed on J10 an alarm sounds and the screen remains blank The jumper is for 3900 3900P system software upgrades only and should not be used for oximetry software upgrades To correct this situation Turn off the oximeter Remove
39. and memory tests during monitoring The software continuously monitors the patient sensor and if a failure is detected discontinues power to the sensor 1 Overview 12 2 Electromagnetic compatibility EMC The 3800 3900 and 3900P pulse oximeters comply with the requirements of EN 60601 1 2 Electromagnetic compatibility Requirements and tests Emissions EN 55011 Group Class 8 The 3800 3900 and 3900P oximeters were tested with no peripheral devices when operating on battery power The 3800 pulse oximeter was tested with an RS 232 cable attached when operating on AC power The 3900 and 3900P pulse oximeters were tested with an RS 232 cable and analog output cables attached when operating on AC power A USRobotics Sportster Fax Modem was connected to the 3900 when Electrical Safety and EMC testing was performed The analog output was measured using a fiber optic link during testing When installing and using this monitor take precautions to ensure electromagnetic compatibility Table 1 1 Guidance and manufacturer s declaration electromagnetic emissions The 3800 3900 3900P TruTrak is suitable for use in the electromagnetic environment specified below The customer or the user of the 3800 3900 3900P TruTrak should assure that it is used in such an environment Emissions test Compliance Electromagnetic environment guidance The 3800 3900 3900P TruTrak uses RF energy only for its RF emissions T internal function T
40. ard then power on to download the software 1 Locate the upgrade socket U19 on the system board near the rear of the monitor Oximetry Board O System Board J4 J3 IC Chip U19 JT J8 Figure 3 3 Upgrade socket and SYS IC chip 2 Carefully align the notch on upgrade chip SYS X XXX with the notch on socket U19 Then insert the chip into the socket 3 Turn on the oximeter Messages similar to those shown below are displayed System Download in Progress Erasing System Download in Progress Progress XX Retries XX CYCLE POWER Progress 10096 Retries XX Updated to Ver Y VYY 3 9 3800 3900 3900P Technical Reference Manual NOTE Contact Datex Ohmeda to obtain a new upgrade chip if the upgrade does not proceed as described above and the CRC BAD or INCOMPATIBLE error message is displayed e CRC BAD indicates an incorrect or damaged IC chip e INCOMPATIBLE means the upgrade software is not compatible with your oximeter These errors do not affect the previously installed software You can stop the system upgrade and the monitor will return to its prior operating condition You may upgrade the oximetry software if you had planned to do so If either message appears turn off the oximeter Then go to step 5 When the Cycle power message is displayed turn off the oximeter Use an IC chip extr
41. are upgrade socket The Flash memory 512 K x 8 bits contains the application code software which runs the oximeter An upgrade socket allows download of revisions to the application code software The software upgrade socket accepts a memory chip with the same pinout as the onboard Flash memory A super cap provides flash memory backup while the battery is disconnected RS 232 connector interface This port which operates at 9600 baud 3800 or 9600 19 2K 38 4K or 57 6K baud 3900 3900P allows for transmission of oximetry data to other serial devices It has optoisolators and an isolated power supply so that there is no ohmic connection between the connector and the digital system 3900 3900P Two analog outputs allow SpO and pulse rate outputs in analog form at O to 1 volt full scale Mode switch The mode switch settings determine the modes of operation for the oximeter such as the averaging mode for example The switches are ESD protected by a 14 channel dual SCR chip connected to the power supply The positions of the switches are read directly through 8 of the TPU channels Alarm signal and pulse tone generator This is a sawtooth generator The circuit produces a signal that is rich in harmonics A resistor in the feedback loop controls the slope of the rising edge while another resistor controls the slope of the falling edge The frequency is set to about 800 Hz Volume is controlled by the microprocessor using pulse widt
42. arefully remove the used battery pack from its tray in the unit 5 Place the new battery pack in the battery tray with the connector toward the rear of the unit and near the system board 6 Firmly secure the battery pack with the hook and loop straps 7 Press the battery wire connector firmly into the connector on the system board The connector is constructed so it will only go on one way with the white flange toward the power entry module 8 After checking that no wires are out of place or could be pinched reinstall the cover see section 5 1 2 9 Perform the Functional check section 3 1 and the Electrical safety check section 3 2 3900 3900P Turn on the oximeter and check the settings time alarm limits etc before using for patient monitoring 5 10 5 Repair and Replacement Procedures 54 Speaker replacement Tool Phillips screwdriver 1 1 2 10 11 Remove the cover observe all warnings and cautions see section 5 1 1 Remove the power supply e Disconnect the green wire spade lug on the power inlet module from the ground on the power supply Disconnect the blue brown primaries from the power inlet module from J1 on the power supply e Release the toroid from the rear panel and remove the toroid from the secondaries e Disconnect the secondaries from J8 on the system board e Remove the two screws from the inner side of the power supply e While rotating slightly to release the pow
43. ation Lower the printer lid onto the printer bucket Plug the new printer button board connector in the printer board Reinstall the four screws that hold the printer board to the oximeter cover Reinstall the cover see section 5 1 2 Perform the Functional check section 3 1 and the Electrical safety check section 3 2 5 15 3800 3900 3900P Technical Reference Manual 5 16 6 IMlustrated Parts This chapter contains the following information List of available service kits and other orderable parts Front panel parts list and assembly drawing Oximeter chassis parts list and assembly drawings System board components and layout Oximetry board components and layout Switch board components and layout Sensor filter board components and layout 3900P Printer board components and layout 3900P Printer button board components and layout Important e Section 6 1 contains part numbers for individual items and for service kits that contain multiple items If a part number is not listed for an item that item is not available for order separately e The item number in each list of parts identifies the part in the associated drawing e 3800 Replacement parts for two versions of the 3800 are listed 6051 0000 163 and 6051 0000 064 an earlier version Please check the order number REF of your 3800 before ordering parts e Board schematics and component lists can be obtained by ordering the 3800 3900 3900P
44. before returning the unit for patient monitoring Tool Phillips screwdriver 1 5 1 1 Removing the cover WARNING Electrical shock hazard Before cleaning or repairing the oximeter turn it off and disconnect it from AC mains power CAUTION Static sensitivity Internal electronic components are susceptible to damage by electrostatic discharge To avoid damage when disassembling the oximeter observe the standard precautions and procedures for handling static sensitive components 1 Turn off the oximeter and disconnect the power cord from the rear of the chassis 2 Remove the two screws that secure the cover to the rear of the chassis 3 Firmly press down on the cover and push it away from the front panel until it slips out of the locks on each side of the chassis 4 To release the cover from the slots on the chassis grasp both sides of the cover near the lower front corners and pull firmly outward 5 Lift the cover up keep the sides free of the oximeter chassis 6 3900P Disconnect the printer cable from the printer board 7 Remove the cover 5 1 2 Replacing the cover I 3900P Position the cover above the chassis and connect the printer cable to the printer board 3900P To avoid disconnecting the printer cable position the cover so that the tabs on each side of the cover are directly above the capture slots on the chassis Grasp both sides of the cover near the lower front corners and firmly pull ou
45. brown primaries from the power inlet module from J1 on the power supply Release the toroid from the rear panel and remove the toroid from the secondaries Disconnect the secondaries from J8 on the system board Remove the two screws from the inner side of the power supply While rotating slightly to release the power supply from the chassis bracket lift the power supply out of the chassis Place the new power supply in the chassis making sure it is secure in the chassis bracket Reinstall the two screws that hold the power supply to the chassis bottom Clamp the toroid around the secondaries and fasten to the rear panel Connect the secondaries to J8 on the system board Connect the blue brown primaries from the power inlet module to J1 on the new power supply Connect the green wire spade lug from the power inlet module to the ground on the power supply Reinstall the cover see section 5 1 2 Perform the Functional check section 3 1 and the Electrical safety check section 3 2 5 3 2 Equipotential ground connector replacement Tools Phillips screwdriver 1 10 mm open ended wrench Needle nose pliers Remove the cover observe all warnings and cautions see section 5 1 1 To disconnect the ground wire green yellow from the power inlet module to the equipotential ground connector e Use the open ended wrench to remove the end nuts hex M6 with captive washers from the equipotential ground connector e Slide
46. c warnings and cautions you must follow when servicing the oximeter e Safety procedures you must follow when handling or repairing equipment that may be contaminated Related information For a detailed description of your monitor s components functions general operating guidelines and RS 232 interface see the 3900 3900P Pulse Oximeter User s Manual or the 3800 Pulse Oximeter User s Manual If you need to reference printed circuit board schematics and component lists purchase and refer to the information contained in the 3800 3900 3900P PCA Drawings Service Kit See chapter 6 for a description and order number For information related to sensors sensor application and cleaning for example refer to the instructions for the sensor Technical competence CAUTION Only qualified service personnel should perform the procedures described in this manual Only trained service personnel or competent individuals who are experienced with servicing medical devices of this nature should perform the procedures described in this service manual 3800 3900 3900P Technical Reference Manual 11 General description The 3800 3900 and 3900P pulse oximeters are noninvasive arterial oxygen saturation and pulse rate monitors Through the use of a sensor applied to the patient and connected to the monitor these pulse oximeters measure the absorption of selected wavelengths of light to calculate pulse rate and arterial oxygen saturati
47. connections Power on the modem Check the phone line Check initialization string entry Verify the accuracy of the string 3900 3900P User s Manual Enter a guard tone if needed Refer to the 3900 3900P User s Manual For some older modems the oximeter s baud rate must be set to match the modem s baud rate To set the oximeter s baud rate refer to the 3900 3900P User s Manual Contact the modem manufacturer for assistance Data transmission from the oximeter is very slow or fails repeatedly The data transfer rate of the modem connected to the oximeter is too low Use a 56K modem or fax modem 4 14 4 Troubleshooting 4 5 Test points 4 5 1 System board test points See section 6 5 for the placement of test points on the system board NOTE TP2 TP3 TP4 TP7 and TP8 are not used Test point Signal name Description TP1 LOWBAT Battery voltage has dropped below 7 3 V TP5 ISOLATED GND Isolated circuit reference TP6 RECHRG Battery voltage has dropped below 7 0 V reset by mains power applied TP9 AUDIO AMP IN Sawtooth alarms square wave pulse TP10 SAWTOOTH OUT Sawtooth waveform at approx 8 kHz TP11 RXD Received oximeter board data TP12 TXD Data transmitted to oximeter board TP13 DGND Digital ground reference TP14 VSW If on battery then battery voltage 0 3 V else 11 5 V unit operating TP15 VRAM 5 V with unit operat
48. container if possible Trademarks Datex amp Ohmeda OxyTip TruTrak PerfTrak amp TeleOximetry and Pl are the property of GE Healthcare Finland Oy All other product and company names are the property of their respective owners CC 0537 GE Healthcare Finland Oy Helsinki Finland 358 10 394 11 www gehealthcare com 2005 General Electric Company All rights reserved Contents 1 Overview Related information Technical competence 11 General description rst eere te AAR 1 2 111 Major components block interconnect diagram 1 2 1 1 2 General subassembly description 1 2 Power inletimodule imt tite e retia ded 1 2 POWer SUppll ce bb Nd te d et Np ed tls 13 Battery S stem Dod utet ee ete eee e e e eet 13 OxItmetrg DOGFGS rer t e Ern e UR vH Ret ae rcc eret a cot 1 5 Sensor filter board 1 3 Erontspariel Locate tope RR dated n NUR S 13 3900P DFIPIEeT uie te tee eee ede e tes 1 3 12 Compliance with standards o 0 ssssssssccccsssssssecccesssssessscesssnsssssccesnsssssescessnnssesescecsnnssssescecsnssssess 1 4 1 41 General safety requirements u ccseccccssssesscscsssssescsssssseesssssssuesessssssnueesssssssneesssessaneees 1 4 Sarety checks TORSORWON Cre cic teen od eee d eed 1 4 1 2 2 Electromagnetic compatibility EMC ttn Electromagnetic e Tett o ode MU Aerei tte a oerte cM L5 Specifications sete tette setius pere RE tees sedent c
49. d Printer button board failure Printer board failure System board failure To unlock refer to the 3900 3900P User s Manual Reconnect the printer cable Remove the printer bucket see section 5 7 2 Check that there are no broken wires on J1 of the printer button board or that J4 on the printer board has not come unplugged Replace the printer button board see section 5 7 2 Remove the cover see section 5 1 1 Check that J9 is plugged into the system board Replace the printer board see section 5 7 1 Replace the system board see section 5 5 3800 3900 3900P Technical Reference Manual 4 4 3900 3900P TeleOximetry messages and troubleshooting 4 4 1 TeleOximetry status messages These messages may be displayed on the oximeter when you send data to a remote computer or to a fax machine using a modem or fax modem connected to the oximeter The meaning and response if applicable for each message is included NOTE For status messages and error messages related to using the TeleOximetry PC Access software refer to the instructions located on the TeleOximetry CD Status message oximeter Meaning Response BUSY The fax machine or phone line is busy The modem redials the number until the fax machine or phone line is no longer busy or until you press CANCEL CONNECTING The FAX machine has answered the phone CONNECTION FAILURE The modem cannot contact the fax machine or rem
50. dio AM and FM radio broadcast and TV broadcast cannot be predicted theoretically with accuracy To assess the electromagnetic environment due to fixed RF transmitters an electromagnetic site survey should be considered If the measured field strength in the location in which the 3800 3900 3900P TruTrak is used exceeds the applicable RF compliance level above the 3800 3900 3900P TruTrak should be observed to verify normal operation If abnormal performance is observed additional measures may be necessary such as re orienting or relocating the 3800 3900 3900P TruTrak Over the frequency range 150 kHz to 80 MHz field strengths should be less than 5 V m 3800 3900 3900P Technical Reference Manual Electromagnetic effects Electromagnetic interference including interference from portable and mobile radio frequency RF communications equipment can affect this monitor Table 1 4 Recommended Separation Distances between Portable and Mobile RF Communications Equipment and the 3800 3900 3900P TruTrak The 3800 3900 3900P TruTrak is intended for use in an electromagnetic environment in which RF disturbances are controlled The customer or the user of the 3800 3900 3900P TruTrak can prevent electromagnetic interference by maintaining a minimum distance between portable and mobile RF communications equipment transmitters and the 3800 3900 3900P TruTrak as recommended below according to the maximum output power of the communications equipm
51. e tissue site due to dark pigmentation or incorrectly positioned sensor Fingernail polish present Detector failure Sensor connector failure Clean the sensor if reusable or sensor site Reposition the sensor or select a different site Remove polish or select a new site Replace the sensor See section 4 3 INTERFERENCE DETECTED The signal is too erratic to be processed Possible cause is strong radio frequency RF interference generated by electrosurgery No action required Readings do not change during interference Readings change to dashes if interference persists Signal processing resumes when interference ends 4 2 4 Troubleshooting Message Cause Action LOW BATTERY 5 to 15 minutes of battery operation remain i e battery voltage 7 3 V Plug oximeter into the AC power supply to recharge the battery Important To prevent permanent damage to the battery recharge a discharged battery within eight hours after the LOW BATTERY message is displayed LOW QUALITY SIGNAL Sensor off patient Perfusion insufficient for valid readings Motion at sensor site electrical noise or incorrect sensor placement Reattach the sensor Check patient and oximeter setup reposition or relocate sensor Check patient and oximeter setup eliminate source of motion noise Model 3800 Pulse Oximeter or Model 3900 Pulse Oximeter or Model 3900P Pulse Oxim
52. e assy ribbon 20 cond 2mm IDC bd mt IDC fem oximetry board J2 Connector header str locking 2 row 4 pin battery Header 1 row 4 pin shrouded power supply Connector header shrouded 2 x 17 rt angle 2mm P PCB printer board J1 TruTrak monitors 3900 3900P without TruTrak and replacement system boards only Header str open 2 pin programming jumper TruTrak monitors and replacement system boards only Jumper NOTE Jumper is installed for 3800 not installed for 3900 3900P Switch dip 8 position rt angle user settable Microprocessor Socket for software upgrade IC chip 6 5 2 System board layout all monitors except 3800 without TruTrak J11 J1 Ui TP5O x J3 OO Ex TP10 PY io J5 SW1 O TP12 ur S O OTP13 Onis omi Ot TP6 O O TP17 TP19 TP11O TP14 O 1P200 J9 Important This board is used in all TruTrak monitors It is also the replacement system board for any 3800 3900 or 3900P monitor with or without TruTrak JT J8 TP21 6 15 6 14 3800 3900 3900P Technical Reference Manual 6 5 3 System board layout 3800 REF 6051 0000 064 and 6051 0000 163 OTP1 O TP5 A O TP6 J4 J3 O TP1
53. e oximeter case for damage Make sure the display area is clean 2 Connect the power cord to the rear panel connector and to AC mains power Important TruTrak monitors For TruTrak performance the rear panel Mode Switch for SpO averaging must be set to Long 12 seconds 3 Before connecting a sensor verify that it is approved for use with the oximeter For example only OxyTip sensors can be used with TruTrak monitors 3 1 3800 3900 3900P Technical Reference Manual 3 2 If you re using a reusable sensor make sure it opens and closes smoothly Remove substances that may interfere with the transmission of light between the sensor light source and detector WARNING Sensors e Discard a damaged sensor immediately Do not repair a damaged sensor or use a sensor repaired by others e Toprevent patient injury or equipment damage use only Datex Ohmeda oximeter sensors approved for use with this oximeter For complete information about the safe and appropriate use of a sensor consult the instructions for that sensor CAUTION Do not apply tension to the sensor cable sensor damage may result Connect the sensor cable to the sensor connector Make sure the connection is firm and that the sensor cable is not twisted sliced or frayed Verify oximeter operation e Press the power button to turn on the oximeter Verify that the model name that is displayed on the screen Model 3800 Model 3900 or Mode
54. eep pitch modulation reflects changing SpO levels Adjustable volume alarm tone Alarm silence 120 seconds all mute continuous silence Out of limits alarms for SpO and pulse rate Sensor condition system failure and recharge battery alarms Dimensions and weight 3800 3900 height x width x depth 9 4 cm 3 7 in x 24 4 cm 9 5 in x 22 5 cm 8 9 in 3900P height x width x depth 10 4 cm 4 1 in x 24 4 cm 9 5 in x 22 5 cm 8 9 in Weight 3800 3900 2 9 kg 6 5 Ibs 3900P 3 2 kg 7 0 Ibs 1 9 3800 3900 3900P Technical Reference Manual 1 10 1 3 2 Factory settings Parameter 3900 3900P 3800 High SpO limit OFF lappears as OFF appears as Low SpOp limit 8596 8596 High pulse rate 130 bpm Adult mode 130 bpm Neonate mode 200 bpm Low pulse rate 40 bpm Adult mode 40 bpm Neonate mode 100 bpm Alarm volume 3 3 Pulse volume 2 2 Save limits No Not applicable Data output mode SpO2 Not applicable printer and modem Data output resolution 6 second Not applicable All mute Yes Not applicable Serial transmission 9600 Not applicable baud rate Analog 0 0 V Not applicable Print contrast 5 Not applicable Date format DD MM YY Not applicable Time format HH MM Not applicable Mode switches Switch 3900 3900P options 3800 options Language Danish Dutch English English factory setting factory setting Finnish French
55. ent Separation distance according to the frequency of the transmitter Rated maximum output m power of transmitter 150 kHz to 80 MHz 80 MHz to 800 MHz 800 MHz to 2 5 GHz d 0 70 JP d 0 70 JP d 1404 P For transmitters rated at a maximum output power not listed above the recommended separation distance d in meters m can be estimated using the equation applicable to the frequency of the transmitter where P is the maximum output power rating of the transmitter in watts W according to the transmitter manufacturer NOTE1 At80 MHz and 800 MHz the separation distance for the higher frequency range applies NOTE2 These guidelines may not apply in all situations Electromagnetic propagation is affected by absorption and reflection from structures objects and people Indications that the monitor is experiencing electromagnetic interference include the following e Variations in the PerfTrak waveform display e Sudden increases or decreases in the waveform height that do not correlate to the physiological condition of the patient Sensor related messages that are not resolved by the instructions found in this manual e The display of dashes on numeric LEDs when a valid physiological signal is present e 3900P Printed output that is garbled solid black or missing This interference may be intermittent and careful correlation between the effect and its possible source is important Indications of interference sh
56. er orientation alignment and function Make sure the 9 pin connector from the sensor filter board or flex cable is firmly connected to the back of the sensor connector on the front panel 10 Connect the switch board ribbon cable to J1 on the system board 3800 3900 3900P Technical Reference Manual 11 12 13 14 15 16 17 Monitors without TruTrak Connect the sensor filter board connector P2 to J1 on the oximetry board TruTrak monitors Connect the sensor filter flex cable P2 to J6 on the oximetry board Slide the front panel assembly onto the oximeter chassis until it is in place Reinstall the two screws that hold the front panel assembly to the sides of the chassis Monitors without TruTrak Make sure the two loop fasteners used with the sensor filter board are each wrapped around two small ferrites and pressed against the hook and loop fastener on the side of the chassis Reinstall the cover see section 5 1 2 Perform the Functional check section 3 1 and the Electrical safety check section 3 2 5 Repair and Replacement Procedures 5 3 Power related components 5 3 1 Power supply replacement Tool Phillips screwdriver 1 1 2 NOW 9 10 11 12 13 14 15 Remove the cover observe all warnings and cautions see section 5 1 1 Disconnect the green wire spade lug on the power inlet module from the ground on the power supply Disconnect the blue
57. er supply from the chassis bracket lift the power supply out of the chassis Disconnect the speaker connector from J3 on the system board Remove the O ring that secures the speaker within the three retaining pins that hold the speaker in place Lift the speaker straight up Put the new speaker in place make sure it is properly seated within the three retaining pins Reinstall the O ring around the outside of the three retaining pins Connect the speaker connector to J3 on the system board Reinstall the power supply e Place the new power supply in the chassis making sure it is secure in the chassis bracket e Reinstall the two screws that hold the power supply to the chassis bottom e Clamp the toroid around the secondaries and fasten to the rear panel e Connect the secondaries to J8 on the system board Connect the blue brown primaries from the power inlet module to J1 on the new power supply e Connect the green wire spade lug from the power inlet module to the ground on the power supply Reinstall the cover see section 5 1 2 Perform the Functional check section 3 1 and the Electrical safety check section 3 2 5 11 3800 3900 3900P Technical Reference Manual 55 System board replacement The bank of mode switches and the RS 232 connector are part of the system board If either needs to be replaced you must replace the entire system board 5 12 Tool Phillips screwdriver 1 Important Bef
58. erence 3800 3900 3900P Technical Reference Manual 4 18 5 Repair and Replacement Procedures This chapter contains e Oximeter cover removal and replacement e Replacement of front panel components Front panel Sensor connector Monitors without TruTrak Sensor filter board TruTrak monitors Sensor filter flex cable Switch board LCD Button pads Switch board e Replacement of power related components Power supply Equipotential ground connector Power inlet module Fuses Battery e Speaker replacement e System board replacement e Oximetry board replacement e Replacement of 3900P printer components Printer board Printer button board CAUTION Only qualified service personnel should perform the procedures described in this manual 3900 3900P Datex Ohmeda does not warrant or service modems Contact the manufacturer of your modem for service Refer to chapter 6 for service kit contents part numbers assembly drawings and board ayout drawings Important If the cover is removed for any test or repair procedure always perform the Functional check section 3 1 and the Electrical safety check section 3 2 before returning the unit for patient monitoring 3800 3900 3900P Technical Reference Manual 5 1 Oximeter cover Important If the cover is removed for any test or repair procedure always perform the Functional check section 3 1 and the Electrical safety check section 3 2
59. etel Deere AONE 6 13 6 5 1 System board components shown eeetttttenntntnees 6 13 6 5 2 System board layout all monitors except 3800 without TruTrak 6 13 6 5 3 System board layout 3800 REF 6051 0000 064 and 6051 0000 163 6 14 6 6 OximetrU DOG is ertet N echt 6 15 6 6 1 Oximetry board layout TruTrak Monitors 6 15 6 6 2 Oximetry board layout monitors without TruTrak sss 6 16 TAE ceder p 6 17 68 Sensor filter flex cable TruTrak monitors t ttcnas 6 18 6 9 Sensor filter board monitors without TruTrak ettet 6 18 6 9 3900P Printer boards ttti anisina ii inisinia 6 19 6 9 1 5900P Pririter DOQOE Q ctis etit et etl t b m t dee 6 19 6 9 2 3900P Printer button board eee 6 19 1 Overview This manual provides instructions for servicing all Model 3800 Model 3900 and Model 3900P pulse oximeters This includes models with TruTrak technology the patented technology for enhanced performance during conditions of clinical patient motion Important Only OxyTip sensors can be used with TruTrak monitors The 3900P is identical to the 3900 except that it contains an integral printer All references to printer functions and components are for the 3900P only This chapter contains e A general description of the oximeter and its main components e Oximeter specifications e Precautions including specifi
60. eter on product identification screen Version X XXX YY YYY on second power up screen Appears briefly when you power on the oximeter e XXXX represents the current system software version e YY YYY represents the current oximetry software version 3900P If Model 3900 not Model 3900P is displayed the printer cable may be disconnected No action required 3900P Reconnect the printer cable e Turn off the oximeter e Remove the cover reconnect the cable and reinstall the cover Power on the oximeter and verify that Model 3900P is displayed NO SENSOR also see CHECK SENSOR SITE Sensor not fully inserted into the sensor connector May be an incorrect sensor Insert sensor plug into the connector Refer to the instructions for the sensor PRINTER FAILURE 3900P printer Printer paper jam Printer has failed 3900P printer Remove the jammed paper Refer to the 3900 3900P User s Manual Service printer see section 5 7 4 3 3800 3900 3900P Technical Reference Manual Message Cause Action SENSOR FAILURE The connected sensor is not an OxyTip sensor Oximeter can t identify the connected sensor Inoperative LEDs or broken sensor cable wire the sensor has failed Oximeter s sensor circuitry has failed Use only OxyTip sensors Replace the sensor Refer to the instructions for the sensor Replace sensor Replace the oximetry b
61. h modulation PWM Another PWM channel on the microprocessor generates pulse tones the microprocessor controls the frequency of this tone Discrete logic is incorporated to produce an alarm tone at full volume in the event that the microprocessor is not operating Microprocessor supervisor This chip monitors the power supply contains a watchdog has battery switchover circuitry generates reset pulses and disables the SRAM during power down If the power supply voltage is too low this circuit holds the reset on the processor until the correct voltage is restored It also switches the SRAM supply power to the Vbatt input and disables RAM when the supply voltage is low If the microprocessor does not pulse the watchdog input occasionally the chip issues a reset pulse It also enables the alarm tones if the watchdog is active 3800 3900 3900P Technical Reference Manual Audio amplifier This is a single chip that amplifies the audio tones It has a bipolar output that allows for maximum volume with a single supply The amplifier has a low pass pole at 17 5 KHz to reduce noise which may be picked up at the input to the amplifier Front panel interface Switches on the front panel are read via various discrete 1 0 lines on the processor They are scanned via an output port on the front panel circuit board the switch board The numeric displays on the front panel are sent data via the serial peripheral interface of the processor Backgr
62. herefore its RF emissions are very low CISPR 11 P and are not likely to cause any interference in nearby electronic equipment RF emissions Class B CISPR 11 The 3800 3900 3900P TruTrak is suitable for use in all Harmonie emissions establishments including domestic establishments and Class A those directly connected to the public low voltage power IEC 61000 3 2 supply network that supplies buildings used for domestic Voltage fluctuations flicker emissions purposes Complies IEC 61000 3 3 3800 3900 3900P Technical Reference Manual Table 1 2 Guidance and manufacturer s declaration electromagnetic immunity The 3800 3900 3900P TruTrak is intended for use in the electromagnetic environment specified below The customer or the user of the 3800 3900 3900P TruTrak should assure that it is used in such an environment Immunity test IEC 60601 1 2 test level Compliance level didis i DE Electrostatic discharge ESD IEC 61000 4 2 Electrical fast transient burst IEC 61000 4 4 Surge IEC 61000 4 5 Voltage dips short interruptions and voltage variations on power supply input lines IEC 61000 4 11 Power frequency 50 60 Hz magnetic field IEC 61000 4 8 6 kV contact x 8 kV air 2 kV for power supply lines 1 kV for input output lines 1 kV differential mode 2 kV common mode 596U gt 95 96 dip in U for 0 5 cycle 40 96 U 60 dip in U for 5 cycles 70 96 U 30 96 dip in U for 2
63. ical hazards only in c Us accordance with the Canadian Standards Association CAN CSA C22 2 No 601 1 and Underwriters Laboratories Inc UL 2601 1 LR87833 Medical electrical equipment classified with respect to electric shock SP fire and mechanical hazards only in accordance with the Canadian Standards Association CAN CSA C22 2 No 601 1 ESELA Medical electrical equipment classified with respect to electric shock i fire and mechanical hazards only in accordance with Underwriters Laboratories Inc UL 2601 1 71273 1 2 1 General safety requirements The 3800 3900 and 3900P pulse oximeters comply with the requirements of EN 60601 1 Part 1 General requirements for safety of medical electrical equipment Type BF applied part Type of protection against electric shock Class l Internal electrical power source Degree of protection against ingress of liquids Ordinary IPXO Mode of operation Continuous The oximeter also complies with the following EN 865 Pulse oximeters Particular requirements EN 475 Medical devices Electrically generated alarm signals Safety checks for software Software design controls include performance of a risk analysis using methods consistent with EN 1441 Medical devices Risk analysis To ensure proper operation of the software the monitor employs three separate watchdog circuits for the microprocessors power on self tests including memory checksum and calibration verification
64. ing 4 V in standby mode TP16 VR 4 V in standby mode TP17 ON High when unit is on low when unit is in standby TP18 RST Normally high low when processor is being reset TP19 RECHRG Battery voltage is above 7 V TP20 5D 5V TP21 DGND Digital ground reference 3800 3900 3900P Technical Reference Manual 4 5 2 Oximetry board test points See section 6 6 for the placement of test points on the oximetry board s Oximetry board in TruTrak monitors REF 6050 0006 066 Test point Signal name Description TP1 PRE Detector preamp output TP2 TEST SIG Test signal amplifier output TP3 LPF1OUT LP filtered detector or test signal TP4 INTF Output of interference detection amplifier and integrator TPS COMP GAIN OUT Multiplexed detector signal after composite gain varies based on detector signal TP6 RDC Red composite signal after LP filter TP IRDC Infrared composite signal after LP filter TP8 IRDCHP IRDC after HP filter TP9 RDCHP RDC after HP filter TP10 RESET Normally low high when processor being reset TP11 AC GAIN IN Input to AC gain amplifier multiplexed ROCHP and IRDCHP TP12 AC GAIN OUT Output of AC gain amplifier multiplexed RAC and IRAC TP13 RAC Red photoplethysmographic waveform TP14 IRAC Infrared photoplethysmographic waveform TP15 AD MUX OUT A D multiplexed signal for all channels scaled by 0 78 TP16 AMUX A D multiplexor output scaled b
65. interface menus messages etc are in English only 6 5 3800 3900 3900P Technical Reference Manual 62 Front panel assembly 6 2 1 Front panel components Item Oo ON DN FW hn FP PPP PPP PB NOOB hoo 18 19 20 21 22 23 24 25 26 27 28 Description Front bezel label Sensor connector Front bezel Silicone alarm button Silicone volume button 3800 Silicone volume menu button 3900 3900P Sensor connector ferrite toroid Sensor connector nut Switch board Interconnect to system board LCD foam 2 LCD assembly Silicone alarm limits buttons Silicone power button Foot strip elastomer Standoff 2 Pressure plate foam Pressure plate sheet metal Plate shown in section 6 2 2 is used in 3800 REF 6051 0000 064 only e Plate shown in section 6 2 3 is used in the 3800 REF 6051 0000 163 and the 3800 with TruTrak Foam corner seal 2 NOTE Not used or needed in monitors that have EMI seal in cover Foam sedl strip 2 NOTE Not used or needed in monitors that have EMI seal in cover Screw ZnPl PPH M3 x 16 2 Filter board insulator film Interconnect to oximetry board see NOTE below Split shell cable ferrite 4 J see NOTE below Loop fastener 2 see NOTE below Screw ZnPl PPH M3 x 8 4 see NOTE below Sensor filter board see NOTE below Plastic ferrite end clip 2 used in 3800 REF 6051 0000 064 only Ferrite half 2 used in 3800 REF 6051 0000 064 only
66. istor divider circuit that is connected to the ADC reference of the microprocessor The middle of the resistor divider is connected to a buffer which then goes directly to the ADC 25 Passive filtering sensor filter board or flex cable Passive filtering components provide the interface between the oximetry board and the sensor connector on the front panel Passive filtering to the sensor connections is intended to protect the oximeter electronics from electromagnetic interference The components used for passive filtering depend on the oximetry used by the monitor e The Sensor filter board is used only in monitors without TruTrak oximetry e The Sensor filter flex cable is used only in monitors with TruTrak oximetry Important The Sensor filter board and the Sensor filter flex cable are not interchangeable 2 11 3800 3900 3900P Technical Reference Manual 2 6 3900P Printer interface 2 12 2 6 1 Printer board The printer board contains the motor driver tachometer shaper head drivers and temperature sensor keypad decoder The printer interface provides the circuitry required to drive the printer mechanism with outputs from the microprocessor It also provides signal condition for handshake signals going to the microprocessor HDI TI Tachometer shaper Printer mechanism Temperature sensor keypad decoder ESD protection The motor control signal from the microprocessor turns on a FET transistor that shorts
67. it from AC mains power Fire explosion hazard Replace fuses only with fuses of the same type and voltage rating Do not use the monitor in the presence of any flammable anesthetic mixture 1 14 1 Overview Patient safety Never test or perform maintenance on the oximeter while it is being used to monitor a patient Sensors To prevent injury or equipment damage use only oximeter sensors approved for use with this oximeter For complete information about the safe and appropriate use of a sensor consult the instructions for that sensor Discard a damaged sensor immediately Do not repair a damaged sensor or use a sensor repaired by others 14 2 Cautions General US Federal law restricts this device to sale by or on the order of a licensed medical practitioner Only qualified service personnel should perform the procedures described in this manual Handle the monitor with care Improper handling can cause damage or inaccurate results Static sensitivity Internal electronic components are susceptible to damage by electrostatic discharge To avoid damage when disassembling the oximeter observe the standard precautions and procedures for handling static sensitive components 3900P To avoid damage to the print head from electrostatic discharge take special care when servicing the 3900P printer Sensors Do not apply tension to the sensor cable sensor damage may result Cleaning Do not autoclave pressure ste
68. it is disconnected from AC power System board failure Replace the system board see section 5 5 Unit will not enter standby mode Switch board failure System board failure Remove the cover see section 5 1 1 To check the power button on the switch board e Remove the front panel assembly see section 5 2 Unplug the switch board s ribbon cable from the system board e Check power button switch on pins 16 and 44 on the ribbon cable e Replace the switch board see section 5 2 Replace the system board see section 5 5 4 10 4 Troubleshooting Situation Cause Action No communication through the RS 232 port Cable failure Connector failure Check the signal voltages and the wiring on the cable from the oximeter to the connected device pin assignments are shown in section 1 3 7 Check the RTS Request To Send and CTS Clear To Send lines for voltage pins 7 and 8 respectively Replace the system board see section 5 5 3900 3900P Times in reports do not match Reports generated at different times or different ways No action required Times stated in reports i e PC downloads printouts InstaReports may vary depending on when how the report is generated however the clinical information including duration is accurate 3900P Printer buttons do not initiate an action Button may be locked print trend button only Printer cable may be disconnecte
69. l oximetry software see section 3 3 Replace the oximetry board see section 5 6 157 Oximeter value failure System board receives invalid data from oximeter board Check cable connection between system and oximeter board If the error occurs only occasionally may be random causes e g static discharge Monitors without TruTrak Upgrade oximetry software if error occurs repeatedly see section 3 3 If the error persists replace the oximetry board see section 5 6 4 7 3800 3900 3900P Technical Reference Manual 4 3 Troubleshooting guide The following chart lists situations that may occur while using the oximeter and the 3900P printer These situations do not generate a message Follow the recommended action s in the order listed until the cause is isolated and corrected NOTE Situations that may occur while using the 3900 3900P TeleOximetry feature are described in section 4 4 Situation Cause Action Unit does not power on Battery discharged Fuses blown Power supply failure Battery failure Switch board failure System board failure Plug the unit into AC power verify that the green power light is on Check the fuses Replace if necessary see section 5 3 4 Remove the cover see section 5 1 1 Check the power connection to the system board Check for 12 V at J8 pin 4 to J8 pind Check the battery connections Measure the voltages between the power supp
70. l 3900P matches your oximeter If it does not match refer to section 4 3 e Check that the red LED on the sensor is on e Attach the sensor to a finger or an ear as appropriate for the sensor Verify that the following appears on the screen during the power on sequence 3900 3900P If the saved low SpO alarm limit is below 8096 a message shows the saved alarm limit or OFF and the saved alarm volume setting See below for examples of the screen that shows the modes in effect the progress of the self test and an icon that indicates the battery charge status 3800 3900 3900P Averaging Mode Long Averaging Mode Long Patient Mode Adult SpO Calibration Functional Self test in progress Self test in progress gm 0 gm 0 V Below the bar graph the software version numbers appear as X XXX YY YYY X XXX represents the system software version YY YYY represents the oximetry software version As the self test progresses verify that all LEDs illuminate and that a beep sounds During the diagnostic self test which lasts for about 10 seconds electronics battery status analog signal path integrity and calibration are checked and the default parameters are set For details see section 3 1 2 Upon successful completion of all self tests the monitor is considered to be in calibration and begins normal operation This message is displayed for all monitors except the 3800 without TruTrak Test pa
71. lure of operation If the oximeter fails any part of the checkout procedures or current leakage test remove it from operation until qualified service personnel have corrected the situation Data validity Conditions that may cause inaccurate readings and impact alarms include interfering substances excessive ambient light electrical interference excessive motion low perfusion low signal strength incorrect sensor placement poor sensor fit and movement of the sensor on the patient To prevent erroneous readings do not use an inflated blood pressure cuff or arterial blood pressure measurement device on the same limb as the oximeter sensor Electrical shock hazard Measure the oximeter s leakage current in accordance with applicable standards after completing any repair procedure This equipment must be properly grounded e Electrical safety specifications e g current leakage and ground resistance can be assured only when the oximeter is connected to a three wire grounded receptacle without the use of extension cords or adapters e If there is any doubt about the integrity of the AC power supply protective earth conductor operate the oximeter on internal battery power e Because the unit is not grounded when it is operating on battery power do not connect any equipment to the RS 232 port on the rear panel unless the unit is connected to the AC power supply Before cleaning or repairing the monitor turn it off and disconnect
72. ly and the battery see section 4 5 1 Replace the battery see section 5 3 5 To check the power button on the switch board e Remove the front panel assembly see section 5 2 e Unplug the switch board ribbon cable from the system board e Check the power button switch on pins 16 and 44 on the ribbon cable Replace the switch board see section 5 2 Replace the system board see section 5 5 Unit powers on but the graphic display is blank or black Viewing contrast incorrect LCD failure Switch board failure System board failure Adjust viewing contrast slider Remove the front panel assembly see section 5 2 Check the resistance of the viewing contrast potentiometer at J1 must be between 0 and 50 kQ Check the LCD connector pins and the switch board LCD connector for damage Replace the switch board LCD see section 5 2 Replace the switch board see section 5 2 Replace the system board see section 5 5 4 8 4 Troubleshooting Situation Cause Action Unit powers on an audible beep sounds but there are no displays Switch board failure System board failure Remove the front panel assembly see section 5 2 Check the ribbon cable from the switch board to the system board for proper seating in the connector for bent pins or for damage On the system board check at J1 pin 1 to pin 4 for 45 V Replace the switch board see section 5 2 Replace the system boa
73. mber correctly and the remote equipment fax machine modem and or computer is powered on NO DATA You tried to send a fax that covered only hours during which no numeric data were collected For example if numeric data were collected two hours earlier but not during the last hour of operation you can send two or more hours of data but not one This eliminates the possibility of sending an InstaReport that contains no numeric data 4 Troubleshooting Status message oximeter Meaning Response NO DIAL TONE The modem cannot find a dial tone when attempting to call the number Verify that the modem is properly connected to the correct phone line NOT FOUND CONNECT MODEM The oximeter modem was not detected by the oximeter Check and correct all connections between the oximeter and modem Power on the modem If the message persists refer to section 4 4 2 SEARCHING The oximeter is searching for the modem you selected MODEM at the MENU screen SENDING FAX The connection process is complete and the fax is being sent SENDING DATA REMOTE COMPUTER option Data is being sent to a remote computer or WAIT FOR CALL option Your modem received the call and is sending data to the remote computer TRANSMISSION CANCELED You canceled a remote computer transmission This message is transmitted to the remote computer TRANSMISSION DONE Transmission to a remote computer using
74. nnector from J3 e Battery locking connector from J7 e Secondaries on the power supply from J8 e 3900P Printer cable from J9 Slide the system board toward the front of the oximeter and lift straight up 5 Repair and Replacement Procedures 10 11 12 13 14 15 16 17 18 19 Check header J11 on the new system board e 3800 Verify that a jumper is installed on J11 e 3900 3900P Verify that a jumper is not installed on J11 Holding the new system board as far toward the front of the oximeter as possible position the board s holding slots over the standoffs place it down on the chassis and slide back to hold in place Connect the following to the system board e Secondaries on the power supply to J8 e Battery s locking connector to J7 e Speaker s locking connector to J3 e 3900P Printer cable to J9 Reinstall the screw that holds the heat sink to the rear chassis Reinstall the two jack screws on the RS 232 connector Place the oximetry board on the system board and reinstall the four screws that hold them to the standoffs on the chassis Connect the oximetry board ribbon cable to J6 on the system board Reinstall the front panel assembly e Connect the switch board ribbon cable to J1 on the system board e Monitors without TruTrak Connect the sensor filter board connector to J1 on the oximetry board TruTrak monitors Connect the sensor filter flex cable to J6 on the o
75. nt motion unspecified Resolution 1 bpm 1 bpm TruTrak monitors Pir pulsatile value and 3900 3900P without 3800 without TruTrak TruTrak Range 0 00 to 9 99 Not applicable Averaging 12 seconds Not applicable interval Resolution 0 01 Not applicable Interfering substances Carboxyhemoglobin may erroneously increase readings The level of increase is approximately equal to the amount of carboxyhemoglobin present Dyes or any substances containing dyes that change usual arterial pigmentation may cause erroneous readings Sensor emitter wavelength ranges Red LED peak wavelength range 650 to 670 nm Infrared IR LED peak wavelength range 930 to 950 nm Average power lt 1 mW 1 11 3800 3900 3900P Technical Reference Manual 1 3 4 Alarms Audible alarms Setting levels available Alarm 1 through 5 Pulse beep OFF and 1 through 5 Volume intensity at 1 meter distance Setting of 1 45 decibels minimum Setting of 5 85 decibels maximum Alarm limits SpO alarm limit range High 50 to 100 or OFF Low OFF or 50 to 10096 Pulse rate alarm limit range in beats per minute bpm TruTrak monitors Monitors without TruTrak High 30 to 235 or OFF High 40 to 235 or OFF Low OFF or 30 to 235 Low OFF or 40 to 235 1 5 5 Environmental Parameter Operating Transport and Storage Temperature 0 to 50 C 32 to 122 F 40 to 70 C 40 to 158 F 3900P with printer paper 20 to 4
76. oard see section 5 6 SENSOR OFF Sensor off patient Oximeter s sensor circuitry failed Reattach the sensor Replace sensor If the condition persists replace the oximetry board see section 5 6 SYSTEM FAILURE XXx SERVICE UNIT Internal component has failed XXX error code for the type of system failure See section 4 2 TruTrak OFF TruTrak monitors TruTrak is not active the averaging mode is not set to Long TruTrak monitors Set the Mode Switch to the Long averaging mode refer to the User s Manual for instructions WAITING FOR SOFTWARE DOWNLOAD Monitors without TruTrak Software upgrade is in progress Oximetry board has no software the software download was not completed Monitors without TruTrak No action required Reload the oximetry board software see section 3 3 4 4 4 Troubleshooting 4 2 System failure error codes 4 2 1 Nonfatal errors the system continues running Error code Meaning Cause Action 4 Erase flash failure Software could not erase a Replace system board see section 5 5 sector of the system board Flash memory 20 Buffer full failure Software buffer overflow No action necessary 21 Queue full failure Software buffer overflow Check the connection between the unit and communicating device Verify serial communication setup baud rate stop start bit and parity 52 Oximeter respon
77. on The light generated in the sensor passes through the tissue and is converted into an electronic signal by a photodetector in the sensor The electronic signal passes to the oximeter and is amplified Analog and digital signal processing convert the light intensity information into SpOa and pulse rate values Both models feature two easy to read displays that present patient data and status information e The numeric LEDs light emitting diodes show the SpO2 and pulse rate values e The LCD liquid crystal display shows alarm messages the plethysmographic waveform or data and the high and low SpO2 and pulse rate limit settings This display also shows the Relative Perfusion Index PI pulsatile value and menus as appropriate for the monitor 1 1 1 Major components block interconnect diagram Power inlet Power supply 3900P 3900P Printer module 12V Printer board button board Mode switches Front panel RS 232 port Sensor filter Oximetry board sensor AC Power System board Oximetry board 1 1 2 General subassembly description The descriptions that follow discuss the interaction of major components within the pulse oximeter More detailed information for each component is found in chapter 2 Power inlet module The primary function of the power inlet module is to allow the oximeter to be connected to an AC power source It also serves as a filter for electromagnetic compatibility EMC compliance and contains f
78. onnect it from the back of the sensor connector on the front panel NOTE If you are replacing only the sensor filter board or flex cable you do not need to remove the metal pressure plate or the switch board go to section 5 2 2 7 To remove the metal pressure plate on the back of the front panel remove the screw on each side of the plate and lift the plate off Retain the screws and the standoffs that sit between the plate and the switch board for reinstallation NOTE If you are replacing only the switch board LCD you do not need to remove the switch board go to section 5 2 3 Continue below if you plan to replace the sensor connector button pads or switch board Important The viewing contrast slider may be damaged if the switch board is not removed from the bezel correctly 8 When removing the switch board from the front panel e To avoid breaking the viewing contrast slider make sure the viewing contrast slider which is inserted through a slot just above the power button is as close to the nearest edge of the switch board as possible e Gently grasp the ribbon cable at the top of the switch board e Pull the top of the board back slightly and lift while easing the viewing contrast slider up and out of the slot 3800 3900 3900P Technical Reference Manual 5 2 2 Sensor filter replacement board or flex cable Sensor filter board 1 Remove the four screws that hold the sensor filter board to the pressure
79. ore installing the system board check J11 on the new board 3800 Verify that a jumper is installed on J11 Install a jumper if necessary 3900 3900P Verify that a jumper is not installed on J11 If a jumper is installed remove it Remove the cover observe all warnings and cautions see section 5 1 1 3900P Remove the catch tray e Remove the two nuts from the screws that hold the catch tray to the chassis Remove the two screws from the catch tray and chassis e Slowly pull the catch tray straight up and remove it from the unit Remove the front panel assembly e Remove the two screws on the sides of the chassis that hold the front panel assembly in place and slide the assembly off the chassis e Monitors without TruTrak Disconnect the sensor filter board connector from J1 on the oximetry board e TruTrak monitors Disconnect the sensor filter flex cable from J6 on the oximetry board e Disconnect the switch board ribbon cable from J1 on the system board Remove the oximetry board e Disconnect the ribbon cable from J6 on the system board e Remove the four screws that secure the oximetry and system boards to the standoffs on the chassis e Lift the oximetry board off the system board Remove the two jack screws on the outside of the rear chassis from the RS 232 connector Remove the screw holding the heat sink against the rear chassis On the system board disconnect the following e Speaker locking co
80. ote computer Verify that the phone number was entered correctly and the remote equipment fax machine modem and or computer is powered on If the message persists the phone system used by the oximeter modem may require a guard tone To set the guard tone see the 3900 3900P User s Manual DIAL REMOTE COMPUTER The modem is dialing the number of the modem associated with the remote computer DIALING REMOTE FAX The modem is dialing the number you entered for the fax machine FAX CANCELED When you cancel a fax transmission this message is displayed on the screen and transmitted to the fax machine FAX DONE Fax transmission is complete The modem disconnects the phone line Press lt t to return to the SEND screen FAX ERROR A nonrecoverable error occurred during transmission of a fax This message indicates a problem with your modem the phone line or the fax machine Check the connection setup and function of all these components Verify that you are faxing to a Group 3 fax machine FOUND The oximeter detected the modem that is connected to the oximeter INITIALIZATION STRING FAILURE The modem rejected the initialization string Make sure you entered the initialization string correctly see the 3900 3900P User s Manual If the entry is correct consult the instructions for your modem NO ANSWER There is no answer after the number is dialed Verify that you entered the nu
81. ould not occur if the monitor is used within its intended electromagnetic environment 1 Overview 13 Specifications Unless otherwise indicated all specifications are nominal and are subject to change without notice 1 3 1 General Circuitry Microprocessor controlled Automatic self test of oximeter when powered on Automatic setting of default parameters Automatic alarm messages 3800 Up to 12 hours of stored trend data output through the RS 232 serial port for SpO2 pulse rate and alarm messages 3900 3900P Real time data output or up to 24 hours of stored trend data output through the RS 232 port for SpO 2 pulse rate Pl pulsatile value and alarm messages SpO and pulse rate output through two analog channels Displays The displayed SpO 2 pulse rate and Pl values are updated every second The plethysmographic waveform sweep is updated every 4 seconds Numeric display Light Emitting Diodes LEDs Arterial oxygen saturation SpO 2 reading Pulse rate reading Graphic display Liquid Crystal Display LCD Plethysmographic waveform High and low SpO and pulse rate alarm limits settings Sensor condition alarms Messages alarm messages and system operational status messages Contrast adjustment All monitors except 3800 without TruTrak Pl pulsatile value 3900 3900P SpO real time or stored data graph 3900 3900P PI pulsatile value real time or stored data graph Audio indicators Adjustable volume pulse b
82. ound debug A 10 pin connector allows direct connection to the microprocessor All microprocessor functions can be accessed through this interface Boot code and application code can be downloaded via this connector 3900 3900P Real time clock This is a single chip connected to the microprocessor It provides time month day and year for the display and for printed trend data A super cap provides backup while the battery is disconnected 3900P Printer interface A connector and port allow the microprocessor to control printer functions Handshaking lines synchronize the printer to the microprocessor The microprocessor directly controls the printhead patterns for text and graphic images 2 2 2 System board power management The power management section generates 5 V switches between the 12 V and battery supplies charges and monitors the battery voltage and controls power on and standby modes Block diagram 12V input Switchover circuit VR regulator Battery charger Paley E 5 V switching input regulator Battery voltage monitor Power on standby control 5V supply 5 Vis generated by a buck switching regulator that operates at 52 KHz The input voltage is between about 6 7 and 12 V This supplies power to the digital section the front panel and the oximetry board Microprocessor supervisor Front panel switch 2 Theory of Operations Battery charger The bat
83. p fastener not used in 3800 REF 6051 0000 064 Screw ZnPl PFH M3 x 8 7 6 9 3800 3900 3900P Technical Reference Manual 6 3 2 Chassis assembly drawing 1 7 places 4 6 places j 9 Lo 26 3 Um lt gt 17 e c 16 nd m ec A Ij 15 6 10 6 Illustrated Parts 64 Printer cover assembly 3900P 6 4 1 Printer cover components Item 1 Oo ON DN FW PY PPP PP eB Ui e UNEO Description Paper cover lid Removable tear bar Printer bucket bezel with insulator film Silicone printer buttons Printer button board Interconnect to printer board Oximeter cover with EMI seal for printer Printer board gasket Printer board Screw ZnPl PPH M3 x 12 4 Screw ZnPl PPH FLH M3 x 8 2 Nut M3 Locking 2 Catch tray Interconnect from system board Printer cable 6 11 3800 3900 3900P Technical Reference Manual 6 4 2 Printer cover assembly drawing 4 places 11 2 places 2 places 6 12 6 Illustrated Parts 65 System board NOTE See section 4 5 1 for specific test point TP functions 6 5 1 System board components shown J1 J2 J3 J4 J5 J6 J7 J8 J9 J1 J1 0 SW1 U1 U19 Connector header R A shrouded 2mm 2 row 44 pin switch board W1 Not used open Header 3 pin locking speaker Connector 9 pin D 90 deg PC RS 232 analog outputs Connector dual row 10 pin LW prf socket strip background debug port Cabl
84. perature sensor keypad decoder The LT1392 has a built in temperature sensor and a built in A D converter Both of these values are read by the microprocessor through a serial link The microprocessor uses the temperature to determine the proper contrast setting to drive the printhead The A D converter decodes which button has been pressed on the keypad Pressing one of the four buttons on the printer button board selects a different resistor to change the ratio of a voltage divider The analog voltage generated by the voltage divider is converted by the A D converter and the microprocessor interprets the button that was pressed 2 6 2 Printer button board The printer button board has four buttons and four resistors This board connects to the printer board which in turn communicates which button was pressed to the microprocessor Block diagram P ob P a EEL Two wires go off the button board Each of the four button switches selects one of four resistors with different values to be applied across the two output wires On the printer board this resistor becomes the bottom leg of a voltage divider with another resistor on the printer board The four different analog levels produced by the four switch closures are converted by an A D converter on the printer board thot is tied to the microprocessor The microprocessor determines which switch was selected 2 15 3800 3900 3900P Technical Reference Manual 2 14 3 Test and Upgrade
85. plate 2 Press the 9 pin connector on the bottom of the sensor filter board firmly but carefully into the back of the sensor connector on the front panel 3 Position the new sensor filter board over the pressure plate and install the four screws that hold the board to the pressure plate Sensor filter flex cable 1 Remove the two screws that hold the sensor filter flex cable to the pressure plate 2 Press the 9 pin connector at the end of the flex cable firmly but carefully into the back of the sensor connector on the front panel 3 Position the new sensor filter flex cable over the pressure plate and install the two screws that hold it to the pressure plate 5 2 5 Sensor connector replacement Tool Needle nose pliers or sensor socket wrench 1 Use the needle nose pliers to remove the nut on the back of the sensor connector that secures it to the front bezel 2 Remove the toroid from the back of the connector Then push the connector out through the front of the bezel 3 Insert the new connector 4 Place the toroid on the back of the connector and secure the connector to the front bezel with the nut 5 2 4 Switch board LCD replacement The switch board LCD connects to the switch board on the right side looking down on the back of the switch board through a 19 pin connector 1 Lift the LCD straight up off the switch board and the connector 2 Put the new LCD in place carefully do not bend the connector pins 5 2 5
86. pulse beat volume up SPSTtactile PC mount alarm volume down SPSTtactile PC mount alarm volume up 3900 3900P not used in 3800 SPSTtacti 3900 3900P not used in 3800 SPSTtacti 3900 3900P not used in 3800 SPSTtactil 3900 3900P not used in 3800 SPSTtacti e PC mount waveform screen e PC mount menu screen e PC mount SpO trend screen e PC mount PI trend screen SPSTtactile PC mount SpO high alarm limit down SPSTtactile PC mount SpO high alarm limit up SPSTtactile PC mount SpO low alarm SPSTtactile PC mount SpO low alarm imit down limit up SPSTtacti SPSTtacti SPSTtacti e PC mount pulse high alarm limit down e PC mount pulse high alarm limit up e PC mount pulse low alarm limit down SPSTtactile PC mount pulse low alarm SPSTtactile PC mount power ON OFF Display contrast Cable assy ribbon 44 cnd 2mm system board J1 limit up 6 17 3800 3900 3900P Technical Reference Manual 68 Sensor filter flex cable TruTrak monitors P1 9 Pin socket patient sensor P2 Socket 10 pin center key oximetry board J6 69 Sensor filter board monitors without TruTrak JP1 through 4 Wire buss 24 AWG uninsulated board stiffeners P1 9 Pin socket patient sensor P2 Socket 10 pin center key oximetry board J1 6 18 6 Illustrated Parts 69 3900P Printer boards 6 9 1 3900P Printer board J1 Connector header shrouded 2 x 1
87. ray e Remove the two nuts from the screws that hold the catch tray to the chassis Remove the two screws from the catch tray and chassis e Slowly pull the catch tray straight up and remove it from the unit Monitors without TruTrak Disconnect the sensor filter board connector from J1 on the oximetry board TruTrak monitors Disconnect the sensor filter flex cable from J6 on the oximetry board Disconnect the system board ribbon cable from the oximetry board Remove the four screws that hold the oximetry board and system board to the standoffs on the chassis Lift the oximetry board off of the system board Place the new oximetry board on the system board and reinstall the four screws that hold the boards to the chassis Connect the system board ribbon cable to the oximetry board e Monitors without TruTrak Connect the ribbon cable to J2 e TruTrak monitors Connect the ribbon cable to J7 Connect the sensor filter to the oximetry board e Monitors without TruTrak Connect the sensor filter board connector to J1 e TruTrak monitors Connect the sensor filter flex cable to J6 3900P Replace the catch tray e Place the catch tray s tube directly over the hole in the bottom of the chassis e Align the holes in the catch tray with the holes in the chassis Reinstall the two screws through the chassis and the catch tray Make sure the tube remains in the chassis hole e Reinstall the two nuts to the screws
88. rd see section 5 5 Unit powers on but no audible beep Speaker disconnected Speaker failure System board failure Remove the cover see section 5 1 1 Check speaker connection to system board see section 5 4 Replace the speaker see section 5 4 Replace the system board see section 5 5 Model name displayed at power on is not correct 3900P Printer cable is disconnected Model ID jumper on system board is is not installed for model Turn off oximeter remove cover reconnect printer cable and reinstall cover Verify that Model 3900P is displayed at power on Check J11 on system board for presence absence of jumper e Model 3800 jumper should be installed on J11 e Models 3900 and 3900P jumper should not be installed on J11 Continuous speaker tone System board failure Replace the system board see section 5 5 BUTTON STUCK message or button s not working Dirty worn buttons Switch board failure System board failure Remove the front panel assembly see section 5 2 Check button pads Clean the button pads check for damage replace if necessary see section 5 2 Replace the switch board see section 5 2 Replace the system board see section 5 5 Fuses fail shortly after replacement Shorts or power supply failure System board failure Remove the cover see section 5 1 1 Disconnect the power inlet module from the power supply see section 5 3 3 Check for sho
89. rilize or gas sterilize this oximeter Use cleaning solution sparingly Do not soak or immerse the oximeter in liquid Excessive solution can flow into the oximeter and damage internal components When cleaning the display area do not use abrasive cleaning compounds or other materials that could damage the screen Do not use petroleum based solutions acetone solutions or other harsh solvents to clean the oximeter These substances may damage the oximeter and cause a malfunction 3900P Do not allow cleaning solution to get into the printer mechanism Disposal Dispose of this medical device and its packaging according to local requirements Dispose of the battery which contains lead and acid through an approved hazardous materials disposal facility 1 15 3800 3900 3900P Technical Reference Manual 15 Safety guidelines 1 16 Before you start any procedure that involves disassembly of the oximeter review these guidelines to ensure the proper and safe completion of the procedure WARNING Patient safety Never test or perform maintenance on the oximeter while it is being used to monitor a patient WARNING Electrical shock hazard Before cleaning or repairing the monitor turn it off and disconnect it from AC mains power Power off and disconnect the unit from the AC power supply Disconnect the sensor from the unit Clean the unit see section 1 5 1 FON GIN E gt Read and follow each step of all test and
90. rror code Meaning Cause Action 150 Oximeter error count failure Too many errors in oximeter communications Check cable connection between system and oximeter board If the error occurs only occasionallu may be random causes e g static discharge Monitors without TruTrak Upgrade oximetry software if error occurs repeatedly see section 3 3 If the error persists replace the oximetry board see section 5 6 151 Oximeter command failure System board attempted to transmit an invalid command to the oximetry board Check cable connection between system and oximeter board If the error occurs only occasionally may be random causes e g static discharge If it occurs repeatedly upgrade system board software see section 3 3 If the error persists replace the system board see section 5 5 154 Oximeter sysfail failure Oximetry board detected an internal error and halted operation Check cable connection between system and oximeter board If the error occurs only occasionally may be random causes e g static discharge Monitors without TruTrak Upgrade oximetry software if error occurs repeatedly see section 3 3 If the error persists replace the oximetry board see section 5 6 156 Oximeter reset failure Oximetry board fails to communicate at all Check cable connection between system and oximeter board Monitors without TruTrak Reinstal
91. rts between the wires from the power inlet module Replace the power supply see section 5 3 1 Replace the system board see section 5 5 4 9 3800 3900 3900P Technical Reference Manual Situation Cause Action No response or wrong response from dip switch setting s Dip switch failure Replace the system board see section 5 5 Battery won t charge Battery failure System board failure Plug the unit into AC power verify that the green power light is on Remove the cover see section 5 1 1 Check battery connections Measure the battery voltages across 1 red and 1 black wire should be between 6 5 and 9 5 volts Replace the battery see section 5 3 5 Replace the system board see section 5 5 Green power light remains off when unit is connected to AC power Fuses blown Power cord failure Power supply failure Switch board failure System board failure Check the fuses Replace if necessary see section 5 3 4 Check the power cord replace if necessary Remove the cover see section 5 1 1 Check the power supply voltages see section 4 5 1 Replace power supply see section 5 3 1 Remove the front panel assembly see section 5 2 Disconnect the ribbon cable from the system board Test for voltage on J1 on the ACLED pin pin 14 on the system board Replace the switch board see section 5 2 Replace the system board see section 5 5 Green power light remains on when un
92. screwdriver into the center slot of the fuse holder Gently pry loose and remove the fuse holder Fuse holder Fuses To remove the fuses from the fuse holder use the edge of the screwdriver blade to pry against the bottom of the metal portion of the fuse where it is secured to the glass portion of the fuse Place the new fuse s T2 0AH 250V in the fuse holder Slide the fuse holder back into the power entry module and press firmly to make sure it is fully inserted Perform the Functional check see section 3 1 NOTE If the fuses blow shortly after replacement the unit requires additional service see section 4 3 3800 3900 3900P Technical Reference Manual 5 3 5 Battery replacement Tool Phillips screwdriver 1 1 2 gt 19 3 gt 4 gt A L1 S B8 FN LIEN 6 7 8 9 1 Front of unit 6 Ground connector 2 Battery pack 7 Battery wire connector 3 Hook and loop strap 8 System board 4 Power supply 9 Oximetry board 5 Power entry module 10 Ribbon cable to front panel 1 Remove the cover observe all warnings and cautions see section 5 1 1 2 Undo the hook and loop straps to release the battery pack 3 Remove the battery wire connector red and black wires to a white connector from the system board at the rear of the oximeter 4 Being careful to contact no other internal components c
93. scsssssssssssssssssssssssssssssssssssessssssesescssssssessssssecsssssssecsssssssscesssssseceseees Contents 26 1e Pinter Doar e ME Motor driver Tachometer shaper Head drivers ESDDEFOTGGEOD e ettet i to ete eed e einer e Temperature sensor keypad decoder 2 13 26 2 Printer Dutton DOGEG ep EH bee 2 13 3 Test and Upgrade Procedures 3 1 Functionality te Stinson 3 1 3 14 7 Printer test 5900D tte been belle tb redeat 3 3 5 12 Diagnostic seles secet teet t dece t edis 3 4 3 27 Electrical safety check a oerte eet dessine bn te cid etu rris 3 4 33 Software upgrade ee ad sq tees ta dice ede te EN 3 5 3 3 1 Remove the cover and identify the system board 3 6 3 3 2 Optional Check the installed software versions 3 6 3 3 3 System software upgrade using the U LOADER or LOADER chip 3 7 3 3 4 System software upgrade using the SYS chip 3 9 3 3 5 Oximetry software upgrade monitors without TruTrak 3 11 3 3 6 Install the cover and check the installation 3 12 4 Troubleshooting LS IMOSSOGES AE A REPE 4 1 42 System failure error COCES rssssccccssssssssscccsssssseeececsssssseescecsssssseeceessssssceeccessssssseeccssssssssescessnssssess 4 5 4 2 1 Nonfatal errors the system continues running ssss 4 5 4 2 2 Fatal errors the system sounds an alarm tone and halts wu eee 4 6 45 gt Troubleshooting guide au ee rettet teceiteestte
94. se Communications error Upgrade system and or oximetry software failure between system and as applicable for your monitor see section oximetry boards 3 3 53 Oximeter timeout Oximetry board failed to Check the connection between the oximetry failure respond within the board and the system board appropriate amount of Monitors without TruTrak Upgrade time oximetry software see section 3 3 Replace oximetry board see section 5 6 55 Oximeter user error Improper communications Upgrade system and or oximetry software failure from system to oximetry as applicable for your monitor see board section 3 3 Incompatible system and oximetry software versions 57 Oximeter value Communications error Upgrade system and or oximetry software failure between system and oximetry boards Incompatible system and oximetry software versions as applicable for your monitor see section 3 3 4 5 3800 3900 3900P Technical Reference Manual 4 2 2 Fatal errors the system sounds an alarm tone and halts Error code Meaning Cause Action 4 6 101 Appl CRC failure System board application Reinstall system board software see code corrupted or not section 3 3 programmed Replace system board see section 5 5 102 Boot CRC failure Invalid system boot code Replace system board see section 5 5 103 RAM failure Error in system board fthe error occurs only occasionally may RAM be random causes e g sta
95. sessscssssesescssssesesssed 6050 0003 760 Sensor receptacle Pins 9 Toroid Sensor filter board monitors without TruTrak eee 6050 0004 284 Sensor filter flex cable TruTrak monitors 6050 0006 530 Software upgrade kit all monitors e esee eeeesennnd 6050 0006 528 Speaker assembly with O ring cssssssssccccsssssssssccessssnseseceesessusessccesersuseseccesessnseseeeeseed 6050 0004 286 6 Illustrated Parts Switch board 3800 REF 6051 0000 064 Order Front bezel assembly 6050 0005 837 Switch board with ribbon cable all monitors except 3800 REF 6051 0000 064 etr teteeseeeeeennnnnnnnoconstsettsestnsnnns 6050 0005 312 System board all monitors e essere rseeeesennaooteeeonna uut 6050 0006 531 TeleOximetry cable interface kit 2 cables 3900 3900P 6050 0005 833 Datex Ohmeda modem analog cable 61 cm 2 ft dark gray cable with one RS 232 connector and two analog connectors 1 red 1 white RS 232 serial cable DB 9 male female 1 8 m 6 ft TeleOximetry PC Access Software 3900 3900P 6050 0006 529 This PC program available at no charge lets users access trend data stored on a 3900 3900P and transfer the data to their PC The user can view the transferred data file or use it to generate a report The software a demonstration program and instructions are provided on a compact disk CD The instructions and
96. si tec ree beetle entree teo ides 4 8 44 3900 3900P TeleOximetry messages and troubleshooting 4 12 4 4 1 TeleOximetry status messages ttt 44 2 TeleOximetry troubleshooting guide LUMINE 4 5 1 System board test points eene tttttennnnitttn 452 OXIME board test pomis s e ette tete es Oximetry board in TruTrak monitors Oximetry board in monitors without TruTrak ss 4 17 5 Repair and Replacement Procedures bil Oximetet COVOT aoe tiere Dit hos cntuaven sob osvasd feb oec bc Foe opea ona 5 2 5 1 1 Removing tie COVer insekton ep eletto Ot 5 2 5 12 Replacing the OVE Oei taie enden tee landed 5 2 5 2 Front panel dssembly pectet AEGA 5 3 5 2 1 Front panel remove and disassemble see 5 3 5 2 2 Sensor filter replacement board or flex cable 5 4 Sehsottilter DOOI1 ecce EAR NER E 5 4 Sensor filter flex CAS sass set RR ERR NR ARE RR HE 5 4 523 Sensor connector replacements e e eden 5 4 5 24 Switch board LCD replacement eec 5 4 52 5 Buttons pad replacement ae ede e ee t eed 5 4 Contents 5 2 6 Switch board replacement merenrannan Ae 5 5 5 2 7 Front panel reassemble and reinstall 5 5 5 3 Power related COMPONENKG sssccccsssssseseccessssssesececssssuseseceesessusececessessuseseccesersusseecessessnseseeeestees 5 7 5 3 1 Power supply replacement sete ttttteenttttttnnnnntttts 5 7 5 3 2 Equipotential ground connector replacemen
97. ssed In calibration 3 Test and Upgrade Procedures 10 11 12 If a problem is discovered during the self test the monitoring screen will not appear and the monitor is inoperable To identify the problem see chapter 4 Verify that the SpOz pulse rate and Pl pulsatile values and alarm limits display within 15 seconds after the self test is complete Dashes may appear for the values until the readings have stabilized and for alarm limits set to OFF NOTE The audible alarm feature for all alarm conditions is silenced for the first two minutes after powering on When two minutes have elapsed since you powered on remove the sensor from the finger or ear and verify that the SENSOR OFF or CHECK SENSOR SITE message appears the alarm tone sounds and an alarm light flashes Press the alarm silence button and verify that the alarm is silenced Randomly adjust an alarm limit and a volume limit to verify button function To verify oximeter operation on battery power power off the oximeter and disconnect it from AC mains power Then repeat steps 5 through 11 NOTE If the remaining battery power is not sufficient to power on the unit a low battery icon is displayed and the monitor shuts off Recharge the battery and continue with the checkout 3 1 1 Printer test 3900P 1 Power on the oximeter and hold down the left most button on the printer until the Datex Ohmeda logo oximeter identification screen appears
98. sssseccessnssseescessnnssssesceesssssees 6050 0003 755 Ground lug Nut SST Hex M6 2 Extender feet kit 5e better dertistereca iecore a 6050 0005 045 Extender foot 2 Nut M3 locking 2 Ferrite KIUu muse terrent clapet n egeat rueecpu R i 6050 0005 313 Ferrite half small 4 Hook loop fastener 5 Sensor connector ferrite Split core cable ferrite with holder 6 Illustrated Parts Front bezel assembly 3800 REF 6051 0000 004 6050 0005 837 NOTE Upgrades the 3800 REF 6051 0000 064 to the 3800 REF 6051 0000 163 Bezel with label foot strip sensor connector toroid switch board with ribbon cable and these buttons Volume Limits Alarm and Power Pressure plate with foam EMI seal Replacement serial number label Attachment hardware Front bezel assembly 3800 REF 6051 0000 163 6050 0003 756 Bezel with label foot strip volume button EMI seal Attachment hardware Front bezel assembly 3800 with TruTrak REF 6051 0000 169 6050 0006 535 Bezel with label foot strip volume button EMI seal Attachment hardware Front bezel assembly 3900 REF 6051 0000 122 6050 0005 138 Bezel with label foot strip EMI seal Attachment hardware Front bezel assembly 3900 with TruTrak REF 6051 0000 168 6050 0006 536 Bezel with label foot strip EMI seal Attachment hardware Front bezel assembly 390
99. t 5 7 5 3 3 Power inlet module replacement tenentes 5 8 5 544 FUSE replacement ee ea tete fite deeds 5 9 5 55 Battergrepldcernents de ecce t e e De Rs 5 10 5 4 Speaker replacement 5 5 System board replacement u cssssssssssssesssssessceccsesssnssnsesseseesceeceessssnsunnessseeeseceeseesessnsunnessssess 5 12 5 66 Oximetry board replaceMent sscccssssssssscecssssneseseecsesnnessseesessnnesssessessnnesseeecsssnnesseeeseesnnesseeess 5 14 5 7 1 5900P Printer repair ener ioter redet e o dedisse t ded S NASEN 5 15 5 7 1 Printer board replacement we 5 15 5 7 2 Printer button board replacement senes 5 15 6 Illustrated Parts 6 1 SerVic dj cree asensin iane asiasia desain aisian Taanis is R 6 2 6 2 Front panel assembly 6 6 6 2 1 Front panel components uu ccsssssssscsccsssseeesccssssnsecccesssusecssssssssecsesssssuseecsesssuseeesesssneeeees 6 6 6 2 2 Front panel assembly drawing 3800 nnns 6 7 6 2 3 Front panel assembly drawing 3900 3900P s 6 8 6 57 Chassis assembly tete eret t ceste bod etate eee eae asthe cid 6 9 6 54L Chassis componentsass ets e e RA E e reed e hende 6 9 6 3 2 Chassis assembly drawing eiseni Aa 6 10 64 Printer cover assembly 3900P e ttt ttt tts ttsttstest 6 11 6 4 1 Printer cover compolierits tete te teda 6 11 6 4 2 Printer cover assembly drawing nennt 6 12 GS SUSE DOC aide etes teorie ed
100. t oe Enea ros us tat Gehieral i b apo e oe A Ge e es eiret iugi P U DISDIOUS duse ette ede teet eee ettet Audio indicators Dimensions and weight 1 3 2 Factory settings Mode Switches teta ipe e bt epe nid deu ed da git 1 555 Measuremetit nece tea e etie pde ee teer dis PIr pulsatile value IriterferiigssubStalde E ode e e t Rc ege Sensor emitter wavelength ranges 1 11 1 5 4 1 5 5 1 5 6 BObterb uos e MM oe M tM ae erede e He ER EN 1 15 1 5 7 RS3232 COMME COM usto pe ter te ee eee ete ER 1 13 1 4 Precautions e RE etr ERR RIA e e EUR ER d eee t Ne Ae SEAS 1441 Warnings 14 2 GOUT OM Se uns eei eleme ede 15 Safet guidelines ete reete A 1 16 151 Cledhnifig ox ee eene ene ete Re en Tree 1 16 Contents 2 Theory of Operations 21 Power supply and power inlet module e e eeeeesnnnrrtteesonnnus 2 1 2 2 lt Systemiboard 5s eet Cae ea ee oe ae ee 2 2 S stemiboafd TUNCHOMS 23 see ete ttti edere ehe red 2 2 System board data management eet 2 2 MIGFOPROCESSOR it rele tb e tbe pete etre Pete eto 2 3 2 2 1 2 5 Switch board Flash memory and software upgrade socket sss 2 3 RS 232 connector interface seen ttti Mode SWIECh siet bee tein Alarm signal and pulse tone generator Microprocessor supervisor sss Audio ampliflera 2 oie ti moet e i seb tees Front panel interta
101. tery charger is designed specifically for lead acid batteries If the battery voltage is less than 6 52 V the circuit charges the battery at a low current After the battery reaches voltage 6 52 V it charges the battery at 625 mA When the battery reaches 9 8 V the charger changes to a constant voltage charger When the charging current is less than 31 mA the charger goes into a float state holding the battery voltage at 9 4 V Battery monitor The battery is monitored for low voltage and recharge The low voltage trip point is set at 7 3 V and the recharge battery voltage trip point is set at 7 0 V The low battery signal is sent to the microprocessor The recharge battery signal is latched with discrete logic In the event that a recharge battery condition is reached the unit must be connected to AC mains power to reset the recharge battery latch AC monitor 12 V is used to indicate that the unit is connected to AC mains power This signal is level shifted to 5 V and sent to the processor VR supply VR is generated by a low power linear regulator set as about 4 V This voltage is routed to the microprocessor supervisor Vbatt input It supplies power to the power on standby circuitry SRAM and the recharge battery latch when the unit is in standby mode It also supplies power to the real time clock This supply is backed up by a super cap during periods when the battery is disconnected Power on standby circuitry The input
102. the ground wire off Use the needle nose pliers to loosen the equipotential ground connector ring from the rear chassis insert the ends of the pliers into the two grooves on the inside of the ring remove the equipotential ground connector 3800 3900 3900P Technical Reference Manual Place the new equipotential ground connector through the hole in the rear chassis with the green yellow ring on the outside Use the needle nose pliers to tighten the equipotential ground connector ring against the rear chassis Slide the ground wire green uellow from the power inlet module over the equipotential ground connector Place the two nuts with captive washers washers toward the rear of the chassis on the equipotential ground connector and tighten with the open ended wrench Reinstall the cover see section 5 1 2 Perform the Functional check section 3 1 and the Electrical safety check section 3 2 5 3 3 Power inlet module replacement Tools 1 O ND WY 11 12 13 14 15 Phillips screwdriver 1 10 mm open ended wrench Remove the cover observe all warnings and cautions see section 5 1 1 Disconnect the green wire spade lug connector from the ground on the power supply Disconnect the blue brown primaries connector from J1 on the power supply To disconnect the ground wires green yellow from the equipotential ground connector Use the open ended wrench to remove the end nuts with captive washers
103. the jumper from J10 Turnon the oximeter 3800 3900 3900P Technical Reference Manual NOTE Contact Datex Ohmeda to obtain a new upgrade chip if the upgrade does not proceed as described above and the CRC BAD or INCOMPATIBLE error message is displayed e CRC BAD indicates an incorrect or damaged IC chip e INCOMPATIBLE means the upgrade software is not compatible with your oximeter These errors do not affect the previously installed software You can stop the system upgrade and the monitor will return to its prior operating condition You may upgrade the oximetry software if you had planned to do so If either message appears turn off the oximeter Then go to step 5 4 When the CYCLE POWER message is displayed turn off the oximeter 5 Use an IC chip extraction tool to remove the IC chip from the socket Then go to section 3 3 6 to install the cover and check the installation 3 3 6 Install the cover and check the installation 1 3900P Replace the catch tray and connect the printer cable Place the catch tray tube directly over the hole in the bottom of the chassis e Align the holes in the catch tray with the holes in the chassis Reinstall the two screws through the chassis and the catch tray Make sure the tube remains in the chassis hole Reinstall the two nuts to the screws to anchor the catch tray to the chassis Position the cover above the chassis and connect the printer cable to the printer board
104. tic discharge f it occurs repeatedly replace system board see section 5 5 110 Execution failure Error in system board fthe error occurs only occasionally may RAM or the data address be random causes e g static discharge buses f it occurs repeatedly replace system board see section 5 5 111 Reset failure System board processor fthe error occurs only occasionally may was reset due to a bus be random causes e g static discharge error f it occurs repeatedly replace system board see section 5 5 112 Unused interrupt failure Error in system board fthe error occurs only occasionally may RAM or the data address be random causes e g static discharge buses f it occurs repeatedly replace system board see section 5 5 113 Watchdog failure System board software Upgrade system board software see 114 Guard dog failure timing failure section 3 3 Replace system board see section 5 5 120 Buffer full failure Internal system software Upgrade the system board software see 122 Value failure check failed section 3 3 130 Event signal failure 131 Event wait failure 132 Mail create failure 133 Mail send failure 134 Mail wait failure 135 Resource get failure 136 Resource release failure 137 Resource reserve failure 138 Task create failure 139 Task stack failure 140 Task trig failure 141 Task wait failure 142 Timer create failure 143 Timer start failure 144 Timeout failure 4 Troubleshooting E
105. to anchor the catch tray to the chassis Reinstall the cover see section 5 1 2 Perform the Functional check section 3 1 and the Electrical safety check section 3 2 5 Repair and Replacement Procedures 5 7 3900P Printer repair Tool Phillips screwdriver 1 5 7 1 Printer board replacement 1 2 o ND uc e Remove the cover observe all warnings and cautions see section 5 1 1 Remove the four screws that hold the old printer board to the oximeter cover one at each corner Lift up the old printer board and disconnect the printer button board cable that is plugged into the printer board Remove the old printer board Plug the printer button board connector into the new printer board Reinstall the four screws that hold the printer board to the oximeter cover Reinstall the cover see section 5 1 2 Perform the Functional check section 3 1 and the Electrical safety check section 3 2 5 7 2 Printer button board replacement 1 2 Remove the cover observe all warnings and cautions see section 5 1 1 Remove the four screws that hold the old printer board to the oximeter cover one at each corner Lift up the old printer board and disconnect the printer button board cable that is plugged into the printer board Lift the printer bucket plastic away from the printer lid to expose the printer button board Lift out the old printer button board Install the new printer button board in the same loc
106. to the 5 V switching regulator is controlled by a P channel FET The gate of the FET is controlled by a transistor whose base is connected to a flip flop The state of this flip flop determines the on or standby state of the unit The circuit senses when the front panel power switch is depressed When this switch is closed a flip flop is toggled If the unit was in standby the unit changes to the on state If the unit is on the circuit generates a power down request This signal then goes to the microprocessor After the microprocessor finishes any tasks deemed necessary the microprocessor issues a power down command This signal then clears both flip flops and puts the unit in the standby mode In the event that the microprocessor does not respond with a power down command within about 800 ms the circuit times out and clears the flip flops 3800 3900 3900P Technical Reference Manual 2 5 Switch board The switch board provides the interface between the system board and the liquid crystal display LCD the drive electronics for the light emitting diode LED numeric displays and the user interface switches It also interfaces the bicolor alarm LED the power standby switch and the LCD contrast adjustment potentiometer Block diagram Alarm indicator Saturation display Graphic display To system board AC power indicator Pulse rate display The LCD is controlled by the system board over the data bus A hardware line RESET
107. traction tool PLCC extractor REF 0380 1500 124 3 5 3800 3900 3900P Technical Reference Manual 3 6 3 3 1 Remove the cover and identify the system board WARNING Electrical shock hazard Before cleaning or repairing the oximeter turn it off and disconnect it from AC mains power CAUTION Static sensitivity Internal electronic components are susceptible to damage by electrostatic discharge To avoid damage when disassembling the oximeter observe the standard precautions and procedures for handling static sensitive components 1 2 5 re Turn off the oximeter and disconnect the power cord from the rear of the chassis Remove the two screws that secure the cover to the rear of the chassis Firmly press down on the cover and push it away from the front panel until it slips out of the locks on each side of the chassis To release the cover from the slots on the chassis grasp both sides of the cover near the lower front corners and pull firmly outward Lift the cover up keep the sides free of the chassis 3900P Continue with the following steps e Disconnect the printer cable from the printer board Set the cover aside e Remove the two nuts from the screws that hold the catch tray to the chassis Remove the two screws from the catch tray and chassis e Slowly pull the catch tray straight up and remove it from the unit If you know whether or not your system board contains J11 skip this step Look for J11
108. tward Lower the cover until the tabs on each side of the cover drop into the slots on the chassis Push the cover forward until it locks into place against the front panel Reinstall the 2 screws that secure the cover to the rear of the chassis 5 Repair and Replacement Procedures 5 2 Front panel assembly The front panel assembly contains the following replaceable parts e Front bezel pressure plate and sensor connector Monitors without TruTrak Sensor filter board TruTrak monitors Sensor filter flex cable e Switch board switch board LCD and button pads Important The procedures in section 5 2 2 through section 5 2 6 assume the front panel assembly has been disassembled partially or completely as directed in section 5 2 1 then reassembled as directed in section 5 2 7 5 2 1 Front panel remove and disassemble Tool Phillips screwdriver 1 1 Remove the cover observe all warnings and cautions see section 5 1 1 2 Remove the two screws on the sides of the chassis that hold the front panel assembly in place and slide the front panel assembly away from the chassis 3 Monitors without TruTrak Disconnect the sensor filter board connector from J1 on the oximetry board 4 TruTrak monitors Disconnect the sensor filter flex cable from J6 on the oximetry board 5 Disconnect the switch board ribbon cable from J1 on the system board 6 Gently pull back on the 9 pin connector to disc
109. uses to limit the current flow This module is connected to the power supply 1 Overview Power supply The power supply converts power from any AC source between 90 and 264 VAC at 47 to 63 Hz to 12 VDC It also provides the necessary isolation between the patient and the mains The 12 VDC is connected to the system board for further conditioning Battery Power for the unit when it is not connected to the AC mains power is supplied by the battery The nominal battery voltage is 8 V The battery is connected to the system board which conditions the battery and charges the battery when the unit is connected to the AC mains power System board This board conditions power from the 12 V power supply and the battery It charges the battery when supplied with a DC voltage from the power supply On power up it reads the position of the mode switches on the back panel It communicates through the RS 232 port The board sends data to the front panel for display and monitors the button switches An upgrade socket on the board provides a means of upgrading the software The board monitors and sends commands to the oximetry board via a serial interface and a few discrete digital lines The board communicates printer functions to the 3900P printer board It also contains a real time clock for use in 3900 3900P monitors Oximetry board This board drives the LEDs in the oximetry sensor and receives the photodetector signals The signals pass
110. xed into red and infrared channels The channels are low pass filtered at 11 6 Hz These signals are inputs to the analog multiplexor as Red DC and Infrared DC and also to the AC gain process High pass filter and multiplex The red and infrared channels are normally high pass filtered at 0 47 Hz This pole can be changed by the microprocessor to 16 Hz This allows the filters to stabilize rapidly if the overall composite levels of the red and infrared signals have a large change The channels are then multiplexed together for further amplification AC gain stage The signal path for both the red and infrared channels is through the same amplifier This amplifier is microprocessor controlled to optimize the range of the ADC This stage amplifies the AC component of the red and infrared signals 3800 3900 3900P Technical Reference Manual Demultiplex low pass The red and infrared channels are demultiplexed low pass filtered at 1160 Hz and fed into low pass filters These are switched filters with the pole at 10 Hz The outputs of these filters go to the analog multiplexor Analog multiplexor and buffer The LED drive signals preamp red channels infrared channels and power supply voltages are multiplexed into an amplifier that shifts the signals from a range of 5 V to 5 V to 0 to 5 V 5VOLTS GROUND 5 VOLTS Multiplexor Channel hex Signal description 0 Infrared AC signal Red
111. ximetry board e Slide the front panel assembly onto the oximeter chassis until it is in place e Reinstall the two screws that hold the front panel assembly to the sides of the chassis e Monitors without TruTrak Make sure the two loop fasteners used with the sensor filter board are each wrapped around two small ferrites and pressed against the hook and loop fastener on the side of the chassis 3900P Replace the catch tray e Place the catch tray tube directly over the hole in the bottom of the chassis e Align the holes in the catch tray with the holes in the chassis Reinstall the two screws through the chassis and the catch tray Make sure the tube remains in the chassis hole e Reinstall the two nuts to the screws to anchor the catch tray to the chassis Reinstall the cover see section 5 1 2 Perform the Functional check section 3 1 and the Electrical safety check section 3 2 NOTE When you power on the monitor if the model that displays Model 3800 Model 3900 or Model 3900P does not match your oximeter the presence or absence of a jumper on J11 may be the cause If your system board contains J11 a jumper should be installed on it for Model 3800 only 5 13 3800 3900 3900P Technical Reference Manual 56 Oximetry board replacement Tool Phillips screwdriver 1 5 14 1 2 10 11 12 13 Remove the cover observe all warnings and cautions see section 5 1 1 3900P Remove the catch t
112. y 0 39 and level shifted TP17 VREF 4 1 volt reference voltage 4 Troubleshooting Oximetry board in monitors without TruTrak REF 6050 0003 745 Test point Signal name Description TP1 COMP GAIN OUT Multiplexed detector signal after composite gain varies based on detector signal TP2 IRDC Infrared composite signal after LP filter TP3 IRDCHP IRDC after HP filter with variable pole TP4 RDCHP RDC after HP filter with variable pole TPS RDC Red composite signal after LP filter TP6 AD MUX OUT A D multiplexed signal for all channels TP7 IRAC nfrared photoplethysmographic waveform TP8 SCCLOCK Switched capacitor filter clock 1 kHz TP9 AC GAIN OUT Multiplexed RDCHP and IRDCHP after gain TP10 LP PREA LP filtered detector or test signal TP11 TEST SIG Test signal amplifier output TP12 MUX3 Low when U16 A D MUX is selected TP13 RAC Red photoplethysmographic waveform TP14 AC GAIN IN nput to AC gain amplifier multiplexed TP15 AGND Analog ground reference TP16 RESET Normally high low when processor being reset TP17 SRAM_CE Low when static ram is enabled TP18 BUFF AD MUX OUT Buffered A D multiplexor output TP19 DAC CE Low when D A converter is enabled TP20 AGND Analog ground reference TP21 PGM High when flash memory is being programmed TP22 INST High during instruction fetches TP23 A16 Address bus line 16 TP24 AGND Analog ground ref

3800/3900/3900P Pulse Oximeter

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