Model 600 Thermometer Service Manual
Contents
1. 13 Figure 4 Printed Circuit Board Component 14 Figure 5 Final Assembly toad eodd dete du pM d d du M EE 15 Figure 6 Operating Controls and 17 2 Model 600 Technical Manual WARRANTY 1 YEAR LIMITED WARRANTY ON NEW INSTRUMENTS Instrumentation purchased new from Diatek Instruments Inc Diatek is warranted to be free from original defects in material and workmanship under normal use and service for a period of one year from the date of first shipment from Diatek This warranty shall be fulfilled by Diatek or its authorized representative repairing or replacing at Diatek s discretion any such defect free of charge for parts and labor Diatek should be notified via telephone of any defective product and the item should be immediately returned securely packaged and postage prepaid to Diatek Loss or damage in shipment shall be at purchaser s risk Diatek will not be responsible for loss associated with the use of any Diatek product that 1 has had the serial number defaced 2 has been repaired by anyone other than an authorized Diatek Service Representative 3 has been altered or 4 has been used in a manner other than in accordance with instructions The information in this manual has been carefully reviewed and is believed to be accurate however no responsibility is assumed2. Diatek A Welch Allyn Company Figure 2 Schematic 12 Model 600 Technical Manual Figure 3 Schematic earlier serial numbers Model 600 13 Diatek A Welch Allyn Company Figure 4 Printed Circuit Board Component Layout 14 Model 600 Technical Manual Figure 5 Final Assembly Model 600 15 Diatek A Welch Allyn Company 16 Model 600 Technical Manual Figure 6 Operating Controls and Components Model 600 17 Diatek A Welch Allyn Company SPECIFICATIONS Range Accuracy Battery Capacity Dimensions Visual and Audible Indicators Normal and monitor modes 28 9 to 42 2 C 84 0 F to 108 0 F 0 1 C 0 2 F when tested in a calibrated water bath disposable batteries three type AA cells up to 1000 hours of continuous use length 6 25 inches 159mm width 3 7 inches 94mm height 2 4 inches 61mm weight 10 5 ounces 298 grams case material ABS Cycolac T grade plastic digital temperature display 30 second pulse and respiration timer instrument malfunction broken probe probe position low battery out of range temperature 18 Model 600 Technical Manual OPERATING INSTRUCTIONS Set up Procedure 1 Unpack the Model 600 Thermometer and probes checking for any damage that may have occurred during shipping 2 Insert the plug of the probe to be used into the thermometer receptacle and then insert the pro
3. re Oed d Se naan 9 al FE pP EE 9 TOTIS ccu vrbe de EXEC DNE n OFER RA EX E cO S abra be Docs 9 A Na i ADAE E M DE E Se 9 Power su eem toe mE DERE OH Ems nt 10 e Mz ABC oka a 10 Pulse Timer OPEN en a A koni a my Sy ta ee ak oke kw APA ite A eet 10 SPECIFICATION Socios dio 18 Model 600 1 Diatek A Welch Allyn Company OPERATING INSTRUCTIONS 5 axe sa s s kak sikaoaonoinsoonsisaoasasensossasessoeodavanassostanonsasbsasosd pak 19 Se UP dll ee 19 Preparation for temperature 19 Normal Mode 19 Oral Temperature Measurement noie Det wy e tet ke e Fog E ERE DEP pi kob pe pi Shane 19 Rectal Temperature 20 Monitor Mode Opera toke cook LEE ME pedo EE LRQ PO Des 20 BackligbibODGOEalloria HWNT bo ea PHD Mn e PDF iade ip utet 20 Pulse ERE 20 F C ONIN act actioned AY 20 fete ve Poo Gums YR Cose D n ka Dare Dave Dar CYR YR Dau a a kn ak 21 Broken Proba tt kan tk do ke tp as 21 Low BA MON OS cro mex DO cbe i a EDD d Neben dnce a nda ta
4. error and prevent a temperature or timer display 1 A low battery condition any time during monitor mode regardless of pulse time 2 A low battery condition existing prior to starting a predict mode temperature or activating the pulse timer Note Activating the pulse timer when a low battery condition exists will cause a predict temperature in progress to be terminated Probe Position Error The probe position error is an indicator that appears whenever there is a rapid drop in temperature This can be the result of excessive probe movement or poor tissue contact No audible tone will sound for this error indication however a visual indicator will activate Temperature display is unaffected by this indicator except that it will not update until temperature rises Malfunction The Malfunction error indicator activates after the self check whenever the thermometer will not function correctly does not include probe and battery malfunctions Self Tests Initial Power Up Display A special display test is performed each time a new set of batteries is installed Upon inserting batteries all display segments are sequentially turned on for 0 4 seconds The complete test requires 25 seconds and happens only when the batteries are changed Calibration Check Each time the thermometer is turned on an internal check for proper calibration is made at 100 5 F during the display test A malfunction error will be indicated if the t
5. for extended period and not used should have the following preventative maintenance performed every 36 months 1 Replace batteries according to the procedures found on page 22 of this manual 2 Perform the Power Up Display Test Startup Display Test and Calibration Plug Procedure found on page 22 of this manual Model 600 29 WA Welch Allyn Diatek Instruments 7420 Carroll Road San Diego California 92121 800 854 2904 619 621 6600 FAX 619 621 6610 70017 000H
6. for inaccuracies Furthermore this information does not convey to the purchaser of Welch Allyn or Diatek devices any license under the patent rights to the manufacturer Model 600 3 Diatek A Welch Allyn Company MODEL 600 OPERATIONAL CHARACTERISTICS The Diatek Model 600 Digital Thermometer is a portable instrument for measuring patient temperatures over the 84 F to 108 F 28 9 C to 42 2 C range The Model 600 features an LCD readout with backlight interchangeable probes disposable prove covers disposable batteries with a capacity for up to 45 000 temperatures automatic power shutdown both normal and monitor modes of operation and self calibration test capability Normal Mode Removal of the probe automatically turns on the Model 600 and places it in the predict mode when selected by the normal monitor slide switch All segments of the display except the pulse timer are lighted simultaneously for 6 seconds as a display test and the horn is tested for 0 1 seconds The display will read 84 0 28 9 with the down arrow on until the probe exceeds that temperature and will ten display a rising temperature for about 30 seconas When the readout has stabilized the horn will sound for 1 second the F or C symbol will light and the display will remain fixed indicating the end of the temperature taking cycle The displayed temperature will be the actual probe temperature plus a computed correction factor The probe tempe
7. of the 9600 and allowed to settle for 2 minutes to the final temperature The reading on the thermometer must be within the range specified on the 9600 Refer to the M9600 Operation Manual for complete instructions Note All Diatek thermometers thermistor and infrared ear thermometers can be tested in the M9600 If you are having problems with the use of the M9600 refer to the Troubleshooting section in the M9600 Operation Manual MODEL 600 TROUBLESHOOTING GENERAL SYMPTOM PROBLEM TREATMENT No Display Temp or Timer or Batteries Low or Incorrectly Replace Batteries low Battery Indication Installed No Temperature Display Timer Probe Plug Bad or Not Seated Reconnect or Replace Probe OK Probe Switch Not Activating Replace S1 Missing or Faded Display Broken LCD Frame Bad LCD Locate and Repair Segments LCD Connector Flex Strip Solder Bridge or U2 Broken Probe Indication Defective Probe Replace Probe Bad Q6 FET Replace Q6 Malfunction Indication Unit Cannot Self Calibrate or Clean Main PC Board Microprocessor has a Malfunction Replace Q3 Q4 Q5 C2 R3 R4 R5 or U2 Certain Broken Probe Replace Probe Conditions 24 Model 600 Technical Manual MODEL 600 TROUBLESHOOTING PCB ASSEMBLY No Display Processor clocks U2 59 21 Display enable U2 10 Display Voltages U2 23 24 25 Malfunction Error or Off Cal With power off measure R3 R4 and R5 Values must be within 5 ohms FET Checks If malfun
8. 0 4 S1 SWITCH PROBE 58101 000 5 LS1 HORN 58102 000 4 J2 FLEXIBLE CABLE 58103 000 4 DS2 LAMP ELECTROLUMINESCENT 58104 000 10 J1 CONNECTOR PROBE 58105 000 6 CONNECTOR ZEBRA 58112 000 10 BATTERY CONTACT COMMON 58411 000 20 BATTERY CONTACT POSITIVE 58412 000 10 BATTERY CONTACT NEGATIVE 58413 000 10 DS1 LCD DISPLAY 60011 000 10 LABEL SET 70158 000 20 SERIAL NUMBER LABEL 70437 000 10 RED WIRE 26 AWG STRANDED 80013 0002 2FT BLACK WIRE 26 AWG STRANDED 80013 001 2FT TY RAP 80038 0000 4 VINYL CORD NECK STRAP 80080 000 2 28 Model 600 Technical Manual SCREW THD ROLL 4X1 4 P PL S Z 83021 0000 4 SCREW PLASTITE 4 20 X 7 8 FLAT 83035 000 2 HEAD 82 DEG PL S Z SCREW MACH 4 40 X 1 1 16 P PL S Z 83036 0000 2 SCREW PLASTITE 4 20 X 3 4 FLAT 83037 000 4 HEAD 82 DEG PL S Z MODEL 600 PREVENTATIVE MAINTENANCE The following suggested preventative maintenance is recommended to maximize uninterrupted service with the Model 600 Thermometer Units which are in service on a regular basis should have the following preventative maintenance performed every 18 months 1 Visually inspect the thermometer and probe for physical damage which might cause future product failure 2 Clean unit if necessary and replace batteries according to the procedures found on page 22 of this manual 3 Perform the Power Up Display Test Startup Display Test and Calibration Key Procedure found on page 21 and 22 of the manual Units which are stored
9. 1 TRANSFORMER 52005 000 X1 CRYSTAL 32 768 kHz 47006 000 J1 CONNECTOR PROBE 58105 000 S1 SWITCH PROBE 58101 000 LS1 HORN PIEZO 58102 000 DS1 LCD DISPLAY 60011 000 DS2 LAMP ELECTROLUMINESCENT 58104 000 ZEBRA FRAME 25092 000 CONNECTOR ZEBRA 58112 000 C8 C9 C10 CAP 011F 100V 10 CERAMIC 46009 000 WINDOW DISPLAY 25103 000 BATTERY AA ALKALINE 53009 000 SCREW SELF TAP 4 X 7 8 CSK 82 PLASTILOK 83035 000 R14 RES 1 OHM 1 8W 595 40040 011 PCB DISPLAY 56048 000 Model 600 27 Diatek A Welch Allyn Company PCB MODEL 600 THERMOMETER 56078 000 SCREW MACH 4 40 X 1 1 16 PHD 83036 000 SCREW THD ROLL 4 X 3 4 CSK 82 PLASTILOK 2 83037 000 SCREW THD ROLL 4 X 1 4 CSK 82 PLASTILOK 2 83021 000 RECOMMENDED SPARE PARTS FOR MODEL 600 100 INSTRUMENTS PER YEAR REFERENCE DESIGNATOR DESCRIPTION DIATEK P N QUANTITY NECK STRAP ADJUSTOR 25085 000 2 FRONT CASE 25088 001 5 BACK CASE 25089 001 10 MID FRAME 25090 000 2 BATTERY DOOR 25091 001 2 ZEBRA FRAME 25092 000 15 WINDOW 25103 000 4 DIODE 1N459 44011 0000 4 C1 CAPACITOR 46090 0000 2 C2 CAP 15 10 16V 10 TANT 46123 000 2 X1 CRYSTAL 32 768 kHz 47006 000 4 Q1 Q2 Q7 TRANSISTOR 2N2222 50004 0000 4 Q8 TRANSISTOR 2N4124 50014 0000 2 Q3 Q4 Q5 Q6 FET PWR VN10KM 50021 0000 2 T1 TRANSFORMER 52005 000 1 U2 IC UPD75036 G 12 MASK ROM 54123 000 2 U1 IC MOG 3242 MONOCHIP 54124 000 2 S4 S5 SWITCH CONTACT 58096 000 4 S4 CONTACT BOTTOM 58097 000 4 S2 S3 SWITCH SLIDE 58100 00
10. 25092 000 CONNECTOR ZEBRA 58112 000 C8 C9 C10 CAP 01uF 100V 10 CERAMIC 46009 000 WINDOW DISPLAY 25103 000 BATTERY AA ALKALINE 53009 000 SCREW SELF TAP 4 X 7 8 CSK 82 PLASTILOK 83035 000 R14 RES 1 OHM 1 8W 596 CF 40040 01 1 PCB DISPLAY 56048 000 26 Model 600 Technical Manual PCB MODEL 600 THERMOMETER 56078 000 SCREW MACH 4 40 X 1 1 16 PHD 83036 000 SCREW THD ROLL 4 X 3 4 82 PLASTILOK 2 83037 000 SCREW THD ROLL 4 X 1 4 CSK 82 PLASTILOK 2 83021 000 PARTS LIST units with serial numbers less than 193309 REFERENCE DESIGNATOR DESCRIPTION DIATEK P N U1 IC MOG 3242 MONOCHIP 54124 000 U2 IC UPD75036 G 12 MASK ROM 54123 000 C1 CAP 47uF 6 3V 20 TANT 46090 0000 C2 CAP 15uF 10 16V 10 TANT 46098 000 C3 C6 C7 CAP 33pF MICA 46091 000 C4 CAP 47UF 35V 20 TANT 46013 000 C5 CAP 011F 100V CERAMIC 46094 0000 C11 CAP 1uF 50V 46109 0000 CR2 CR4 CR5 CR6 CR7 DIODE IN459 44011 0000 Q1 Q2 Q7 TRANSISTOR PN2222 50004 0000 Q3 Q4 Q5 FET PWR VN10KM 50021 0000 R1 R2 RES 18K 1 4W 595 40040 1840 R3 RES 6810 1 8W 1 RN50 40266 81 1 R4 RES 5760 1 8W 1 RN50 40265 761 R5 RES 4990 1 8W 1 RN50 40264 9910 R6 RES 200K 1 4W 5 40040 2050 R7 R8 9 R10 R12 R13 RES 100K 1 4W 5 40014 1050 R11 RES 4 7K 1 4W 5 40040 4730 R13 R15 RES 2M 1 4W 5 40040 206 2 3 SWITCH SLIDE 58100 000 S4 S5 SWITCH CONTACT 58096 000 S4 S5 CONTACT BOTTOM 58097 000 J2 CABLE FLEX 30 COND 58103 000 T
11. Diatek Model 600 Thermometer Technical Manual WA Welch Allyn Diatek Instruments 1996 by Diatek Instruments Inc A Welch Allyn Company All rights reserved No part of this manual may be reproduced or transmitted in any form or by any means electronic or mechanical including photocopy without prior consent in writing from Diatek Printed in the U S A Diatek is a trademark of Diatek Instruments Inc All rights reserved Model 600 Technical Manual TABLE OF CONTENTS bid non n n n en n n kn e n e a kk e n A n n n kn n kk On n a NES 3 MODEL 600 OPERATIONAL CHARACTERISTICS nennen nnne 4 Normal Mode miis daran 4 Monitor Modena anar daran daran acatar anar daran dera 4 TIMO sea a RT T T 4 er Cone Ee Pog A A ee eo 4 FETT ORI TO RN kk k or caters oka ANT ka e A ek r kob ke WY T TOT 5 Broken PO A pacts AN RO OR TRUCO qui haud du NE 5 L w Battery e at a aee etude ete ott a etae coe a tef ed a eee o ale pde den 5 Instruinnent Malfunction k es a Y a AR 5 DEM SSIS takte tt tt taa oi ii E PA a NW 5 Battery Installation Display 5 Thermometer Startup UR cedars tee asus REN 5 Display and Horn Te
12. am Technical Overview The heart of the Model 600 is comprised of two custom integrated circuits which provide the microprocessor and analog circuit functions All control and display functions are governed by the microprocessor U2 and all analog interfacing to the microprocessor probe horn and backlight is provided by U1 Probe resistance measurements are made by ratioing pulse widths generated by sequentially switching in two calibration resistors and the probe thermistor These pulse widths are measured by the microprocessor which calculates the probe resistance The actual probe temperature is then calculated from the probe resistance During monitor mode operation the actual probe temperature appears directly on the liquid crystal display which is driven by the integral LCD driver on the microprocessor During normal mode operation the shape of the rising temperature curve is monitored and a continuously computed correction factor is added to the actual probe temperature The normal mode temperature cycle is terminated when the predicted temperature remains stable All switch inputs are monitored by the microprocessor which in turn activates the required functions Inputs to the microprocessor are A D output pulse widths switches low battery detection power on reset microprocessor clock and interval timer clock Outputs from the microprocessor control the display analog IC and display power backlight horn and calibration resis
13. be shaft into the probe storage channel of the thermometer The thermometer will not turn on with the probe disconnected Insert a box of 25 probe covers into the storage well of the thermometer 4 Attach the 250 probe cover dispenser to the wall in a convenient location Preparation for temperature measurement 1 Place the carrying strap around your neck with the instrument display facing you 2 Check that sufficient probe covers remain for a round of temperature taking 3 Select the desired Fahrenheit or Celsius display by setting the F C slide switch to the appropriate position 4 Select the mode of temperature measurement Normal Mode Operation The normal mode of operation provides a rapid means of oral or rectal temperature taking under most conditions Set the normal monitor slide switch to the normal position Withdraw the probe from the storage channel and observe the 6 second display test ensuring that no display segments are missing The unit will then display 84 0 F 28 9 C with the low temperature arrow ON until the probe rises above that temperature Oral Temperature Measurement Load a probe cover onto the probe by holding the probe collar with the thumb and forefinger being careful not to hold or press the ejection button Insert the probe tip gently into patient s slightly open mouth Carefully slide probe under the tongue on either side of the mouth to reach the sublingual artery Have the pati
14. be temperature rises above 84 0 F The calibration cycle is stopped at this point to reduce quantizing errors associated with the measurement of the slowly changing probe temperature The normal mode displayed temperature is the sum of the actual probe temperature and a computed correction factor which is based on the shape of the changing temperature curve at that point in time The values of the correction factor can vary from 0 F to 2 3 F with a typical value when the horn sounds of about 1 F During the display test prior to starting a normal mode temperature cycle the ambient temperature of the probe is measured and is used in the correction factor computation to adjust for differing probe starting conditions The normal mode display is peak reading and therefore the highest temperature is displayed even though the present predicted probe temperature may drop 8 Model 600 Technical Manual The normal mode temperature cycle is terminated when the predicted temperature remains stable for several seconas SELF TESTS Internal Calibration Test The calibration test is performed only once during a temperature taking cycle and occurs during the display test Upon completion of the first calibration cycle the resistance of R4 is measured and compared against limits stored in the microprocessor memory The specified limits are 5740 and 5780 ohms If the resistance calculated by the microprocessor when the pulse width of R4 is measured
15. ction error is showing check for any FET leakage by connecting the voltmeter across R3 R5 and probe with a cal plug in place The meter must not be grounded The voltage across the resistors must not be measurable 10 millivolts or less Ground the gate of Q6 and perform the same test Check for FET Turn On Malfunction error Measure the low state voltage of each FET as it turns on following a probe switch activation check Q3 Q4 and Q5 The low state voltage should be less than 20 millivolts Off Cal Check Q3 Q4 Q5 and Q6 as above If the above tests fail to show the failed component replace C2 then U1 Missing or Faded LCD Segments Loose LCD frame Dirt or oil under zebra strip Exposed PCB clad running between pads on LCD board Solder bridges Broken flex cable omom Unstable monitor cal or bad predict test 2 F add on or malfunction replace C2 Malfunction error probe switch not working correctly S1 shorted to R3 trace under S1 switch lift switch off PCB slightly Backlight Must be tested with a monitor mode temperature being displayed Weak Backlight Check transformer type or C5 No Backlight 1 Check for sguare wave on 1 or O2 collector if sguare wave is present check continuity of T1 secondary about 1K ohms 2 U1 13 and Q1 Q2 emitters must go low 3 Bad or open 5 will cause the sguare wave to be much too high in freguency should be about 400 Hz 4 01 12 must go high 5 U2 12
16. does not fall within these limits the malfunction error is displayed Internal Microprocessor Memory Test The microprocessor memory test is performed only once during a temperature taking cycle and occurs during the display test Each 8 bit byte of program memory is divided into two 4 bit nibbles which are summed The total sum of all nibbles and a special check sum compensation nibble must be O or the malfunction error is displayed Broken Probe Test Each probe resistance sample that is taken is checked to see that it lies between 2000 and 60 000 ohms A resistance value outside of these limits will cause a broken probe error to be displayed DISPLAY Display Voltage Reference Diodes CR2 CR6 Q7 R61 and R7 create the display voltage references of about V 1 volt at U2 25 V 2 volts at U2 24 and V 3 volts at U2 23 Display The liquid crystal display is of the 4 backplane multiplexed type quadraplex requires a regulated operating voltage and is driven directly by the microprocessor Horn The microprocessor provides a control signal to U1 3 which is the feedback input for the horn driver contained in U1 The horn driver output 1 drives the horn H1 at its self resonant frequency of about 6 kHz Backlight The microprocessor activates the backlight by setting U2 4 high This signal is inverted and buffered and reappears at U1 13 going low A low level on U1 13 turns on the backlight inverter circuit consisti
17. e the probe is removed from its holder all display segments except for the pulse timer are lighted for 6 seconds as a visual display test During the display test the horn sounds for 0 1 second Internal Calibration Test During each thermometer startup display test a precision resistor is used to check the thermometer calibration at 100 5 F 38 1 C A failure of the thermometer to measure the calibration resistor within 0 2 F will cause the malfunction error to flash the horn will sound with a double beep every 10 Model 600 5 Diatek A Welch Allyn Company seconds and no temperature measurement will be allowed The thermometer will automatically shut off after 5 minutes of the error display Internal Microprocessor Test During each thermometer display test a check sum of all program memory is calculated and compared against a reference stored in the program An error in the check sum will cause the malfunction error to flash the horn will sound with a double beep every 10 seconds and no temperature measurement will be allowed The thermometer will shut off after 5 minutes of the error display Battery Life Shelf Life The shelf life of carbon zinc chloride or alkaline batteries should be at least three years when stored at 70 F The storage life degrades rapidly with increased temperature Temperature Taking Without Backlight The Model 600 should operate continuously for about 2 000 hours when the backli
18. ent close lips around the probe Hold the probe during the entire temperature measurement process and keep the probe tip in contact with tissue at all times During the temperature taking cycle a continually increasing temperature should be observed on the display When the final temperature has been reached a tone will sound and an F or C will be displayed to the right of the numbers After temperature measurement is complete eject the probe cover by firmly pressing the ejection button on the probe Insert into the probe channel to clear the display in preparation for another temperature Model 600 19 Diatek A Welch Allyn Company Rectal Temperature Measurement Exchange the blue oral probe for the red rectal probe by removing the connector plug from the thermometer and the probe from the storage channel Complete the exchange by placing the rectal probe in the storage channel and plugging the connector into the thermometer Load a probe cover and observe the thermometer start up display as in the oral procedure Separate the buttocks with one hand Apply lubricant if necessary Using the other hand gently insert the probe only 1 cm 3 8 inch The insertion depth should be less in infants and small children Tilt the probe so the tip is touching tissue and continue to keep the buttocks separated Monitor Mode Operation Monitor mode operation is normally used for longer term monitoring or when difficult situati
19. er by setting U2 10 low and initiates a 6 second display test which turns on all display segments except the 30 second pulse timer simultaneously During the display test the following events take place 1 The A D power control line U2 3 is set high by the microprocessor to turn on the power to U1 Model 600 7 Diatek A Welch Allyn Company 2 The low battery detector output UI 9 is tested by the microprocessor A low logic level on UI 9 indicates a low battery condition less than 3 0 volts The horn drive signal U2 11 goes high activating the horn test for 0 1 second The backlight switch normal monitor switch and F C switches are tested by the microprocessor A calibration cycle is performed The calibration test is performed The microprocessor test is performed o N O o e O The probe resistance is tested for an open or shorted condition Following the events which take place during the display test a continuous monitor mode temperature measurement or a predict mode temperature taking cycle is started Probe Temperature Measurement Q3 Q6 Q8 R3 R5 R 16 C2 and U1 comprise a unique resistance to pulse width conversion circuit which allows any one of 4 resistance s to be measured by the microprocessor The circuit allows the microprocessor to select precision resistors with equivalent temperatures at opposite ends of the temperature measurement range and measure their relative pulse widths The
20. es each display segment The entire test lasts about 25 seconds NOTE if the horn is activated by installing new batteries allow the display test to finish then activate the pulse timer to reset the horn Calibration Key Procedure 1 Remove probe plug and insert calibration key Place switch in Monitor Mode Install and remove probe from probe guide to reset thermometer Wait for the display test then observe display Display should read 36 6 0 1 or 97 3 0 2 F Install probe in probe guide to turn unit off N o a pon Remove calibration key and insert probe plug 22 Model 600 Technical Manual Test Procedure Power Up Display Test 1 Install a new set of batteries 2 Immediately upon inserting the last battery the display test will start Observe all display segments as they are sequentially lighted and then extinguished Every segment must be visible 4 If the horn sounds when the batteries are installed wait for the display test to be completed and then press the timer switch to reset the horn Startup Display Test and Calibration Check 1 Set the normal monitor switch to the monitor position 2 Insert a calibration plug into the thermometer 3 Observe the startup display test and check that all segments except the timer are lighted 4 Following the display test the unit should indicate the temperature stated on the calibration plug 5 Note also that the horn sounds for a brief period as a tes
21. ght is not used If an operating time of 2 minutes per temperature is assumed then the potential number of temperatures that can be taken should be about 2 000 hours 30 temperatures hour 60 000 temperatures Temperature Taking With Backlight The backlight uses about 20 times more power than the rest of the thermometer If 20 seconds of backlight usage is assumed for each temperature taken then the number of temperatures that can be taken should be about 17 300 temperatures C F Mode Switch The display mode may be changed between Fahrenheit and Celsius at any time prior to during or after taking a temperature by activating the C F slide switch The numbers will change as the switch is activated however the C F indicator is only visible at the end of a normal mode temperature Normal Monitor Mode Switch The selection of normal or monitor mode operation should be made prior to turning on the thermometer by setting the normal monitor switch to the desired position Once the thermometer has been turned on a change from normal to monitor mode may be made at any time however a change from monitor to normal will cause the horn to beep twice and the thermometer to shut off This error indication and shut off prevents a normal mode temperature from being started with the probe already in place 6 Model 600 Technical Manual MODEL 600 THEORY OF OPERATION Note Refer to Model 600 Thermometer Block Diagram and Model 600 Schematic Diagr
22. goes blank The horn sounds for 0 1 second at 0 15 and 30 seconds Pressing the timer switch while the timer is running causes the timer to restart The switch will not respond if pressed sooner than 1 5 seconds since the last timer activation Backlight The backlight is activated as long as the backlight switch is pressed and the thermometer function is active In the predict mode activating the backlight any time prior to the end of the temperature taking cycle will cause the backlight to turn on for 5 seconds when the final temperature has been reached and the horn sounds No backlight is available when only the pulse timer is in use 4 Model 600 Technical Manual Error Indicators Probe Position Error During normal mode operation the visual probe position error indicator will be displayed as long as tissue contact is broken and the probe temperature is falling This display indicates that a condition exists which may not provide accurate temperatures The error indicator does not affect the temperature taking cycle in any way No temperatures may be taken when any of the following error conditions exist Broken Probe A probe error will be indicated if the probe circuit is open below 10 greater than 60 000 ohms or shorted above 150 F or less than 2 000 ohms The horn sounds a double beep repeating every 10 seconds with the probe error display flashing The unit will shut off automatically after 5 minutes of error indicat
23. hermometer calibration is in error by more than 0 2 F Model 600 21 Diatek A Welch Allyn Company Microprocessor Self Check Each time the thermometer is turned on an internal check for proper microprocessor operation including a test of the entire program is made during the display test A malfunction error will be indicated if any faults are located Cleaning and Sterilization The Model 600 unit and probes should periodically be cleaned by wiping it with an alcohol soaked cloth or pad warm water or non staining disinfectant Do not autoclave or immerse the Model 600 unit Under conditions where an alcohol wipe or germicidal wipe are inadequate the unit may be sterilized in Ethylene Oxide ETO This is to be done at no more than 100 F and 85 humidity It is to emphasized that this procedure is to be used only when absolutely necessary It is imperative that the batteries must be removed from the unit before ETO sterilization Battery Replacement Remove the battery access screw by turning it counter clockwise with a Phillips screwdriver Slide the battery access cover away from the battery access label to expose the batteries Install 3 new AA batteries paying special attention to the and marks in the battery compartment Slide the cover back into place and install the screw turning it clockwise As soon as the batteries are installed a special display test is activated which sequentially lights then extinguish
24. ion The error will be detected any time during predict or monitor mode operation Low Battery A low battery condition exists when the battery voltage drops to approximately 3 0 volts A low battery indication may occur any time during monitor mode operations but only at the start of a predict mode temperature If a low battery condition exists prior to starting the pulse timer the low battery error will be displayed when the timer is started and any normal mode temperature in progress will abort at that time The low battery error displays a flashing symbol with a double horn beep sounding every 10 seconds The unit will shut off automatically after five minutes of error indication Instrument Malfunction A malfunction error will be indicated if either the internal calibration self test or the internal microprocessor self test fails The malfunction indicator flashes with a double horn beep sounding every 10 seconds The thermometer will automatically shut off after five minutes of error indication Self Tests Battery Installation Display Test Immediately following the installation of batteries into the Model 600 a one time only display test is provided All segments of the entire display including the pulse timer and error indicators are sequentially lighted for 0 4 seconds The entire test takes 25 seconds and must occur prior to starting any temperature or timer functions Thermometer Startup Tests Display and Horn Test Each tim
25. microprocessor sets U2 16 to 19 high as required to select the appropriate resistance to be measured R3 provides a pulse width calibration at 93 2 F R5 provides calibration at 106 9 F and R3 is used for a calibration test at 100 5 F A ratiometeric calculation is used to compute the probe resistance from its pulse width relative to those provided by R3 and R5 The accuracy of each calibration resistor is 05 F A resistance to pulse width conversion is initiated by the microprocessor setting U2 64 high for approximately 0 5 seconds with the appropriate FET switch selected sometime within that period U2 64 is then set low and the time from this transition until the A D output U1 2 goes high is measured by the microprocessor The crystal X1 provides the time base for the pulse width measurements The probe temperature is computed using the probe resistance value obtained from the ratiometeric pulse width calculations Monitor Mode Operation In the monitor mode a new probe temperature measurement is completed every 1 5 seconds and a new calibration cycle is completed every 3 seconds The computed probe temperature is displayed directly on the liquid crystal display and will follow both upward and downward movement Normal Mode Operation In the normal mode a new probe temperature measurement is completed every 1 5 seconds At least one calibration cycle is performed at the start of a predict cycle and continue every 3 seconds until the pro
26. must go low Horn 1 12 64 must go high 2 RN1 D or E Model 600 25 Diatek A Welch Allyn Company PARTS LIST units with serial numbers equal to or greater than 193309 REFERENCE DESIGNATOR DESCRIPTION DIATEK P N U1 IC MOG 3242 MONOCHIP 54124 000 U2 IC UPD75036 G 12 MASK ROM 54123 000 C1 CAP 47 6 20 TANT 46090 0000 C2 CAP 15uF 10 16V 10 TANT 46123 000 C3 C6 C7 CAP 33pF MICA 46091 000 C4 CAP 47UF 35V 20 TANT 46013 000 5 CAP O1uF 100V CERAMIC 46094 0000 C11 CAP 1 50V 46109 0000 CR2 CR4 5 CR6 CR7 DIODE IN459 44011 0000 Q1 Q2 Q7 TRANSISTOR PN2222 50004 0000 Q3 Q4 Q5 Q6 FET PWR VN10KM 50021 0000 Q8 TRANSISTOR SIGNAL 2N4124 50014 0000 R1 R2 RES 18K 1 4W 5 40040 1840 R3 RES 6810 1 8W 1 RN50 40266 811 R4 RES 5760 1 8W 1 RN50 40265 761 R5 RES 4990 1 8W 1 RN50 40264 9910 R6 RES 200K 1 4W 5 40040 4730 R7 RES 33K 1 4W 5 40040 3340 R8 R9 R12 RES 100K 1 4W 5 40014 000 R10 RES 4 3 OHM 1 4W 5 40040 430 R11 RES 10K 1 4W 5 40040 1040 R13 R15 RES 2M 1 4W 5 40040 206 RN1 RES SIP 100K 1 10W 40259 000 52 53 SWITCH SLIDE 58100 000 54 55 SWITCH CONTACT 58096 000 54 S5 58097 000 CABLE FLEX 30 COND 58103 000 T1 TRANSFORMER 52005 000 X1 CRYSTAL 32 768 kHz 47006 000 J1 CONNECTOR PROBE 58105 000 S1 SWITCH PROBE 58101 000 LS1 HORN PIEZO 58102 000 DS1 LCD DISPLAY 60011 000 DS2 LAMP ELECTROLUMINESCENT 58104 000 ZEBRA FRAME
27. ng of Q1 Q2 R1 R2 C5 and T1 The inverter supplies an AC voltage of about 80 volts and 300 Hz to the Electroluminescent panel BP1 CR7 blocks negative voltage spikes from entering U1 13 Model 600 9 Diatek A Welch Allyn Company Power Consumption Without the thermometer or pulse timer active the average battery current should be under 50 microamperes When the thermometer function is active the average battery current should be about 1 milliamp Maximum battery current with the backlight on should be about 25 milliamperes Low Battery Detection When the battery voltage is reduced to 3 2 volts UI 9 goes low indicating a low battery condition to the microprocessor which in turn causes the low battery indication to be displayed Pulse Timer Operation Pressing the pulse timer switch activates the microprocessor interrupt to U2 63 starting the pulse timer display The pulse timer input is independent from the temperature taking functions and may be activated at any time Starting the pulse timer causes the microprocessor to turn on the horn for 0 1 seconds at 0 15 and 30 seconds and light one additional clock segment each second until the display is fully lighted at 30 seconds at which time the clock display blanks The timer cannot be restarted for 1 5 seconds following the last press of the timer switch but may be restarted at any later time 10 Model 600 Technical Manual Figure 1 Block Diagram Model 600 11
28. ons prevent accurate temperatures from being taken in the predict mode The probe must be in place against tissue for at least 3 minutes for accurate temperature measurement Because of ambient temperature influence and other factors monitoring temperatures may not be identical to predict temperatures The fluctuation in temperature is the important standard to be observed during monitoring To take a temperature in the monitor mode set the normal monitor switch to the monitor position Insert the continuous monitor probe connector Connect the desired sensor type to the thermometer causing the 6 second display test to appear Verify that no display symbols are missing and then attach the probe to the patient as required Once the temperature readout has been allowed 3 minutes to stabilize the patient may be continuously monitored as long as is necessary The symbol M on the display indicates that the unit is operating in monitor mode The Model 600 will turn off after 5 minutes if a temperature above 84 0 F 28 9 C is not sensed Backlight Operation The display backlight is used to allow the display to be read in poorly lighted areas This function should not be used unnecessarily as it will shorten the thermometer battery life Pressing the backlight switch any time the thermometer function is active will cause the backlight to turn on as long as the button is being pressed In the predict mode activating the backlight prior to the horn s
29. ounding causes the backlight to activate for 5 seconds after the horn sounds Pulse Timer The pulse timer may be used to determine a patient s pulse or respiration rate Press the pulse timer switch once the pulse or breath has been located The timer will beep at 0 15 and 30 seconds The number of pulses or breaths noted in 15 seconds should be multiplied by 4 to obtain the pulse or respiration rate per minute The number of pulses or breaths noted in 30 seconds should be multiplied by 2 for the pulse or respiration rate per minute The timer may be restarted at any time by pressing the pulse timer switch F C Conversion The F C switch may be changed at any time to allow reading in Fahrenheit or Celsius scales 20 Model 600 Technical Manual Error Indicators When any of the following errors occur a tone will sound twice for 1 seconds and the appropriate error indicator will be flashing on and off 5 seconds Except for probe position error no temperature will be displayed while in the error mode and the unit will shut off in 5 minutes Horn will repeat the double beep every 10 seconds if error is not rectified Broken Probe This error is intended to indicate that the probe will not function correctly and should be replaced Low Batteries The purpose of the low battery indication is to preclude an improper reading and to notify the user to change batteries The following conditions will display a low battery
30. rature is sensed about 4 seconds from turn on to correct for ambient probe temperature variations If the temperature measurement cycle is not completed within 5 minutes from turn on the thermometer will turn off at that time A temperature in excess of 108 F 42 2 C will cause an error condition to be indicated by the horn beeping twice every 10 seconds and the up arrow blinking Five minutes of this error condition causes the thermometer to turn off Returning the probe to its holder and then removing it will restart the thermometer Note The normal mode display is peak reading and will not read down Monitor Mode Removal of the probe automatically turns on the Model 600 and places it in the monitor mode when selected by the normal monitor slide switch All segments of the display except the pulse timer are lighted simultaneously for 6 seconds as a display test and the horn is tested for 0 1 seconds The display will then indicate the actual probe temperature updating every 1 5 seconds as long as it remains within the 84 F to 108 F 28 9 C to 42 2 C range and will show the appropriate up or down arrow when outside this range Five minutes of operation outside the operating range will cause the thermometer to turn off Pulse Timer Pressing the pulse timer switch at any time causes the 30 second clock type display to start One additional segment is turned on each second until 30 seconds has been reached at which time the timer display
31. st iia rte epp eden ponn eee pe pk ales d rade 5 Internal Calibration Testi e ok ter od ya va ven a te CD ha det LY AA D ns 5 Internal Microprocessor Tesista e thre de aep ok ka ie ER OPER COUR FO Bn karo pea 6 equa 6 Eu e oca tet aa pice edu a kal ek a aa al a a eh ids bin bt ARR EYN as FAN 6 Temperature Taking Without Backlight ooooooooccccnnnnnncccnnoncccncncnnnnnanncnnnonnnonnnnnnnnnnn cnn nnne 6 Temperature Taking With BackligHt or ree kn ket et RI WERE 6 OA Mode SWINGIN ni niei cado cecus GG e dud dug a 6 Normal Monitor Mode o WE apa toes e ELE IEEE LE ELE LAXE MAA OR AA YR NA AO AAA FAAN NA ont 6 MODEL 600 THEORY OF OPERATION cional 7 Technical OVBTVIGW eto idet acs Ped Meg tud but d tud M tad ds F Temperature Measurement and 7 Probe Temperature 8 Monitor Mode Operalloli e e e 8 Normal Mode Operation sau EE 8 SELETES Tiana oe 9 Internatealibration Testi A ias 9 Internal Microprocessor Memory 9 Broken Probe ndo tes doo da 9 DISPLAY ET ee on a CH YH a cee Y DIR S a cans ee AA De UB UO au 9 Display Vellage Belenencan ek e eve A ad ee eda
32. t Switch Tests With the thermometer on and the calibration plug installed activate the F C backlight and timer switches and observe that the proper response is obtained Insert and remove a probe to test the probe switch action Placing the normal monitor switch in the normal mode should cause the M to not be displayed when the unit is turned on Low Battery Indicator 1 Seta variable DC power supply to 5 volts and then connect it to the thermometer in place of the batteries 2 With a calibration plug installed and a temperature being displayed slowly reduce the power supply voltage until the low battery condition is indicated The power supply voltage must be 3 0 3 volts Power Consumption 1 Set power supply at 5 volts 2 Remove cal plug and let timer run out so that no display is showing 3 The average current should be less than 50 microamperes 4 Set switch to monitor mode 5 Install probe or calibration plug 6 The average current should be less than 1 5 milliamperes M9600 Procedure The M9600 Calibration Tester provides a convenient means of testing the entire thermometer system instrument and probe The 9600 must be warmed up and stable at one of the two available Model 600 23 Diatek A Welch Allyn Company temperature settings The thermistor based instrument under test must be in Monitor mode and no probe cover loaded The probe is inserted into the small hole in the dry heat well
33. tor selection To extend battery life the power to both the analog IC U1 and the LCD reference are turned off and the microprocessor is put to sleep when possible Power to the thermometer is always connected and is not turned on and off by the probe or pulse switch functions Temperature Measurement and Display When batteries are installed in the thermometer C4 and RN1 B provide a power on reset pulse to the microprocessor U2 56 C3 and RN1 A set the microprocessor clock frequency at approximately 200 kHz Following the high going reset pulse the microprocessor initiates the power on display test which causes display segments DS1 to be sequentially lighted for 0 4 seconds and then extinguished After the completion of the display test which lasts approximately 25 seconds the microprocessor then goes into a sleep mode awaking 8 times per second to test the probe switch S1 If the probe is in the thermometer S1 open or the probe is disconnected then the microprocessor returns to sleep for another 1 8 of a second The pulse timer switch S5 is connected to an interrupt input on the microprocessor U2 63 and will wake up the microprocessor and start the 30 second pulse timer In the sleep mode and even when only the pulse timer is active the 200 kHz clock U2 59 will be seen to turn on for about 2 milliseconds every 1 8 of a second If when tested the probe switch circuit is found to be active the microprocessor turns on display pow
34. tur CED A 21 Probe Position ETTO riada a kote OED pi recetas Din REPRE YC BUE Qe pr Ege abra das Lbs TER bank dak 21 AA GU at EE HEEL 21 MOGI KE SIS et Tr 21 Initial Power Lp Display socia cack e enn ae ko FR eke Hp n an kk ki pa ka n ek ek a 21 et kt ea dap Men n a YR a toos Do tk n a ke a ka Wey e e 21 Microprocessor Self NEC Kits ad 22 cisaning and ere 22 Battery 22 Gallbration Key Procedure eds cade ka iu dd A 22 Test OCICS ae e e ea E is 23 M9600 Procedure kwa kd sito kak DD UH UG kk ka kk kk kek kab kk kak 24 MODEL 600 TROUBLESHOOTIN Ge ik n ki a n on ka w pa n e exc ka cerco ccc cerne cce ke k n ann 24 PARTS LIST units with serial numbers equal to or greater than 193309 26 PARTS LIST units with serial numbers less than 193309 27 RECOMMENDED SPARE PARTS FOR MODEL 600 28 MODEL 600 PREVENTATIVE MAINTENANCE 29 TABLE OF FIGURES Figure sleek DIagr alfa kinn eon e err Hao oto ya ay YA dad abo 11 Figure 2 na du end ndd alse obl ee M ett at ik y t 12 Figure 3 Schematic earlier serial
Download Pdf Manuals
Related Search