- Frank`s Hospital Workshop
Contents
1. AEE EEI AE ET 16 120 SChOmMmaltE ioe ice en 20 13 0 PCB Layouts and Assemblies 34 TEO PRT MOD croan s 40 1 0 SCOPE This manual contains the necessary information to allow a qualified Service Technician to perform maintenance and repair in the field If the unit is still under warranty please refer to Section 2 0 2 0 WARRANTY The MALIS Bipolar Electrosurgical System CMC III catalog no 80 1170 is warranted for one full year from date of purchase except the Remote Control Set which is warranted for six months The MALIS CMC III is warranted to be free from defects in both materials and workmanship This warranty shall not apply where service is required due to i Buyer s failure to operate or maintain the Equipment accord ing to the Instruction Manual ii Buyer s use of unauthorized parts or consumables iii accident abuse misuse modification or misapplication or iv improper service THE ABOVE WARRANTIES ARE IN LIEU OF ALL OTHER WARRANTIES EITHER EXPRESS OR IMPLIED INCLUDING ANY WAR RANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE Suitability for use of the device for any surgical procedure shall be determined by the user Codman shall not be liable for incidental or consequential damages of any kind 3 0 SERVICE AND REPAIR For service or repairs to the MALIS CMS IIl genera tor and footpedal contact your local Codman sales representative directly or through Codman Cus2. The coag noise filter also provides proper matching between RF output transformer T501 the forceps cord and biological loading at the forceps Trans former T502 and L504 C529 and C530 are part of the Open Circuit Detector and is explained in the Mother Board description 6 2 6 4 Short Circuit Detection Two short circuit detection circuits are used one each for coag low power cut and high power cut Current through the forceps is sensed by R525 for coag low power cut or R524 for high power cut The sense current in the form of a small voltage is rectified filtered and detected by opto isolators U513 or U515 when the threshold is exceeded The outputs of U513 or U515 cause the one shot timers in U514 to operate at 100 millisecond ms intervals as long as excessive short circuit current is present The outputs of U514 are ORed together to form the signal PWRDIS During the 100 ms period voltage to the RF bridge amplifier is cut off At the end of the 100 ms period RF power is restored to test again for a shorted condition This cycle continues until the short circuit is removed The PWRDIS signal is also shared by the Open Circuit Detector An LED marked short circuit is used during testing to confirm operation The purpose of short circuit detection is to prevent excessively high RF currents from destroying the RF Power Amplifier and forceps 6 2 6 5 isolated Bias Supplies of 7 5 VDC are required for the upper halves
3. Low going signal to O indicating depression of the coag reset switch Low going signal to I O indicating selection of coag power switch Digital signal to RF Power Amplifier RFAMP representing the coagula tion waveform Low going signal to I O indicating depression of cut footswitch Low going signal to I O indicating depression of the cut reset switch Low going signal from I O indicating selection of high power cut winding of T501 via cut control relays Low going signal to I O indicating selection of cut power switch 0 to 5 VDC signal from the digital to analog converter DAC to the HVPS Bidirectional 8 Bit Data Bus Low going signal from Digitalker to external flag 3 input on pP High going signal from I O indicating depression of any footpedal High going signal from I O indicating selection of high power cut mode Low going signal from O indicating selection of high voltage mains relay located on the HVPS board High going signal from O indicating selection of irrigate LED Low going signal to I O indicating depression of the irrigation switch Digital signal from infrared receiver to uP IRRIG LPCUT LT MRD MUTELED MUTESW MWR NOHV N1 N2 N3 OCMONI PWMON PWRDIS Q1MHZ Q 1MHZ RFPWR1 RFPWR2 SCMONI TALKVOL TONEDN TONEUP TONEVOL UP DN Low going signal from I O indicating selection of external irrigator High going signal from I O indicating selection of low power cut mode L
4. modulates the voltage supplied by the High Voltage Power Supply The modulated DC voltage is filtered by L501 L502 L503 C508 and C509 into a decaying DC voltage waveform thus forming the damped sinusoidal signal through the RF bridge amplifier Cut off of DC voltage to the RF bridge amplifier is provided by U503 and the PWRDIS signal under conditions of short and open circuit at the forceps 6 2 6 3 RF Output Steering The RF output transformer T501 is prevented from saturating by a DC blocking capacitor C528 in series with the primary winding T501 s secondary comprises two separate windings one low imped ance and one high impedance Coag and low power cut modes are very low impedance lt 20 ohms high power cut is somewhat higher lt 300 ohms Switch ing secondary windings is controlled by relays K501 K502 and the CUTRLY signal When required the high power cut secondary winding is added in series with the coag low power cut winding to achieve the desired higher impedance The high power cut winding added in series with the coag low power cut winding instead of a tap type connection limits the amount of high voltage energy generated in the high power cut winding when the coagulation mode is used This excessive noise energy can create interference problems both inside and outside the metal case of the CMC III Further coag noise filtering is provided by a low pass filter consisting of L505 L506 L507 C531 and C532
5. Controls Items R and S S Coagulation Output Pedal Coagulation power is delivered to the forceps when you depress this pedal The Coag button on the remote control Item N as shown in Figure 3 also controls this function NOTE Cutting and coagulating power may also be controlled using the MALIS Bipedal Electric Footswitch catalog no 80 1149 connected to the CMC III via the Adapter Cable catalog no 80 1179 Refer to the adapter cable instructions for details 5 5 INDICATORS Figure 5 Front Panel Indicators Items T through DD T Power Output LED This green LED illuminates whenever power of any kind for either cutting or coagulation is delivered to the forceps U W Power Display Windows These three sets of windows show the power selections for high power cutting Item U microcutting Item V and coagulation Item W The power selections can be shown in either MALIS Units or watts use the Watts Display Button Item in Figure 1 to make your choice When the genera tor is initially turned on the setting 35 will appear in both the microcutting and coagulation windows The high power cutting window will be blank The following power settings are available for each operating mode POWER SETTINGS HIGH POWER COAGULATE MICROCUTTING CUTTING Malis Units Watts Malis Units Watts Malis Units Watts B 0 7 8 0 7 60 20 0 10 1 0 10 1 0 70 40 0 15 1 6 15 1 6 80 60 0 20 3 0 20 3 0 90 80 0 25 5 0 25 5 0 100 10
6. VDC 1 Amp regulated c 18 VDC 1 Amp unregulated and d 18 VDC 0 1 Amp unregulated 6 2 1 2 Infrared Remote Control Receiver The Infrared Remote Control Receiver monitors activity from the infrared remote control handheld transmitter and sends the serial data to the uP for processing 6 2 1 3 Pneumatic Footswitches Air pressure from the cut and coag footpedals pressurize their respective air switches Signals are sent to the uP for processing 6 2 1 4 Tone and Voice Volume Control Switches The Tone and Voice Volume Control Switches are located on the front of the Mother Board protruding through the front panel of the CMC III Signals from these switches are sent to the uP for processing 6 2 1 5 DC Blocking Capacitors A capacitive DC block is inserted between the output of the RF Amplifier and the forceps to limit DC circulatory current that occurs during cutting or coagulating to prevent muscle tissue reaction Digitalker is a trademark of National Semiconductor 6 2 1 6 Open Circuit Detector The Open Circuit Detector circuitry is located primarily on the Mother Board with interfacing elements on the RF Power Amplifier Board The open circuit detector helps prevent excessively high cutting voltage during periods of open forceps tips from breaking down components in the RF path It also eliminates the occurrence of AF interference This circuit is active only during the high power cut mode Op
7. can quickly reset the coagulation power to 35 Malis Units or 9 watts by pushing this button H Irrigation Mode Button When the MALIS Irrigator is properly set up and connected to the CMC lII push this button to disable and enable irrigation An additional irrigator button is located on the remote control set The Irrigation Mode Indicator Figure 5 Item AA located on the generator will illuminate when the irrigator is enabled regardless of which of the two switches is used Watts Display Button Press this button to display the power settings in watts The Watts Display Indicator Figure 5 Item CC illuminates whenever power settings show in watts J Voice Mute Button Used to prevent the voice synthesizer from announc ing the operating mode being employed and the power settings each time cutting or coagulating is performed When the voice is muted the Mute Indicator Item BB in Figure 5 illuminates K LED Test Button When you press this button all numeric LEDs should illuminate as a self diagnostic test Any numeric LED that does not illuminate signals a problem requiring attention L Supply Voltage Selector Use this control to set the generator to the same voltage as the power receptacle you are using i i l d i Figure 2 Back Panel Controls Items J through L 5 3 REMOTE CONTROL SET CONTROLS Figure 3 M Cutting Output Button When you press this button cutting power i
8. footpedal a Return for service Figure 10 Power Supply Board 4 Firmly pull the power supply board upward until it can be disengaged from the card holders on either side Do not attempt to pull the board completely out of the chassis it is still connected via the supply voltage wiring 5 Remove fuses F400 and F402 see Figure 11 replace with appropriate type and value fuses see Section 6 7 Technical Specifications l e a UU Pu f DAT a foo teow eSAT AT 220 ea0vae Fade LOGAT AT I0O 120WAC BEAT AT Z2 eeovec Figure 11 Changing Internal Fuses on Power Supply Board 6 Slide the board back into the card holders ensur ing the pins on the bottom of the board align with their connectors Push the board down firmly until the pins seat properly in the connectors 7 Replace the screw holding the board to the bracket Replace the cover and six screws and washers WARNING The supply power setting drum located on the power receptacle at the rear of the generator must also be set to the correct voltage and properly fused for the electrical outlet before turning on the generator 8 0 MAINTENANCE 8 1 Bipolar Forceps Proper care and maintenance of the bipolar forceps is essential to efficient cutting and coagulation Dr Malis states the following While some sticking and charting of the bipolar cutting and coagulation forceps is unavoidable the elimination of the initial overvoltage spike in the
9. tubing tightly wrapped around it may damage the tubing Leave sufficient slack to prevent stress on the tubing Inspect the tubing before each use and replace the footpedal upon evidence of deterioration 8 4 Electric Footswitch Storing the electric footswitch with the footswitch cord tightly wrapped around it may result in damage to the cord Leave sufficient slack to prevent stress on the cord NOTE DO NOT IMMERSE the footswitch in liquids during use The pedals should operate freely with a positive mechanical action Inspect the footswitch cord before use for deteriora tion Do not operate if the vinyl cover is damaged The vinyl covered footswitch is not a repairable item Replace the footswitch assembly as supplied by the manufacturer 8 5 Power Cord Never use extension cords three prong to two prong power plug adaptors or extra length power cords with the MALIS CMC III Before each use visually inspect the power cord and plug for frayed or broken insulation lf necessary replace the power cord with the same type length gauge and insulation 8 6 Remote Control The remote control uses two 1 5v AA alkaline batteries To open the battery compartment press down on the lower portion of the remote s rear cover and slide it down Remove the old batteries Insert new batteries as illustrated within the compartment Slide cover back on until it snaps into position 15 16 9 0 ROUTINE CLEANING The MAUS CMC lIl gen
10. 00 30 7 0 30 7 0 110 120 0 35 9 0 35 9 0 120 140 0 40 11 0 40 11 0 130 160 0 45 14 0 45 14 0 140 180 0 50 17 0 50 17 0 150 200 0 60 19 0 70 22 0 80 24 0 90 25 0 100 29 0 110 32 0 120 35 0 130 40 0 140 45 0 150 50 0 X High Power Cutting LED This yellow LED illuminates whenever cutting power in the high range 60 to 150 MALIS units or 20 to 200 watts is delivered to the forceps Y Microcutting Power LED This yellow LED illuminates when cutting power in the micro range 8 to 50 MALIS Units or 0 7 to 17 watts is delivered to the forceps Z Coagulation Power Light This blue light illuminates whenever coagulation power is delivered to the forceps AA Irrigation Mode LED Irrigation is enabled when this green light is on and a MALIS Irrigator is properly connected NOTE To avoid unintentional irrigation be sure the power on the Irrigator is switched off whenever the CMC II generator is switched off BB Mute LED When you disable the voice synthesizer by using the voice mute button Item J in Figure 2 this green LED lights up CC Watts Display Indicator If you choose watts to be displayed in the power indicator windows Items U V and W Figure 5 by pressing the watts display button item Figure 1 this green LED illuminates DD Infrared Signal Receiver Window This window receives signals from the remote control set Do not obscure the window during use Tone Indicators not shown The CMC III gen
11. 30 160 63 160 00 140 180 67 180 00 150 200 71 200 00 6 6 CALIBRATION Any one or all of the CMC III s 40 power output settings may be calibrated individually by changing the target DAC calibration value as stored in memory associated with each setting DAC value adjustments may be performed with the CMC III in the calibration mode The calibration mode may be invoked by grounding pin 4 of P203 refer to Section 6 4 4 With this pin grounded the message calibrate output power announces and two numbers appear on the front panel numeric LED windows One of the numbers is the Malis Unit setting of the previously selected mode the other corresponds to the setting s target DAC calibration value The DAC value may be increased by momentarily grounding pin 1 of P203 or decreased by momentarily grounding pin 2 of P203 as a safety precaution DAC settings may be changed by no more than 15 steps from the original factory supplied settings The output power associated with a setting s new target DAC value may be confirmed by measuring the unit s output current as described in Section 6 5 Operational Performance Note that the remote control is not functional during the calibration mode Therefore use the front panel rocker switches to change from one power output setting to the next use the footpedal to activate the output lf errors occur during calibration or if the user wishes to restore the original factory set DA
12. C targets momentarily ground pin 5 of P203 to reload the standard DAC calibration values When calibration is complete remove the ground from pin 4 The unit announces calibration off and then reinitializes at Malis Unit settings of 35 in both microcut and coagulate modes 6 7 TECHNICAL SPECIFICATIONS Power Requirements 100 10 VAC with 100 selected on the supply voltage selector 120 10 VAC with 120 selected on the supply voltage selector 220 10 VAC with 220 selected on the supply voltage selector 240 10 VAC with 240 selected on the supply voltage selector 50 60Hz 400 Watts Fuses External For 100 or 120 VAC operation Two 4 0 Amp Type T MDL 125 VAC For 220 or 240 VAC operation Two 2 5 Amp Type T MDL 250 VAC Internal Mother Board Two F600 F601 3 0 Amp Type F AGC 250 VAC One F602 0 5 Amp Type F AGC 250 VAC High Voltage Power Supply Board F400 4 0 Amp Type T MDL 250 VAC for 100 120V operation 2 5 Amp Type T MDL 250 VAC for 220 240V operation F401 2 0 Amp Type F AGC 250 VAC F402 1 0 Amp Type T MDL 250 VAC for 220 240V operation 0 6 Amp Type T MDL 250 VAC for 220 240V operation AC Leakage Current Less than 10 pA with power ON or OFF polarity normal or reversed with ground open or connected Output Waveforms Coagulate Damped Aperiodic centered at 1 MHz Cut Sinusoidal 1 MHz Output Power Range Coagulate 20 settings 72 50 watts into 50 ohm noninduc
13. MAUS CMC IIl waveform greatly reduces the inci dence of sticking and charring Coupled with addi tional waveform modifications the MALIS CMC III can be used with less irrigation or no irrigation at all if required while reducing sticking and charring to levels lower than heavily irrigated spark gap and solid state generators Because the generator is effective at lower settings pitting of the forceps tips which normally occurs is greatly reduced Remove coagulum deposits as often as necessary to keep working surfaces clean This ensures the flow of current between forceps tips We recommend Johnson amp Johnson Medical s Electro Surgical Tip Cleaner J amp J Medical catalog no 3415 If tips become pitted or misaligned return the forceps to Codman Repair Service for repair or replacement 8 2 Bipolar Cord Low or erratic performance may be due to poor con tact between the bipolar forceps cord plugs and isolated bipolar output jacks on the generator Badly oxidized surfaces impede current flow Use an abra sive cloth to gently clean plug surfaces Inspect the bipolar cord before each use replace it upon evi dence of deterioration NOTE Pulling plugs from the jacks of the MALIS CMC III by grasping the cord may damage the cords and cause intermittent operation Disconnect the plugs by holding the plug with one hand and the generator with the other 8 3 Pneumatic Footpedal Storing the pneumatic footpedal with the pneumatic
14. NNECTIONS Figures 6 and 7 EE isolated Bipolar Output Jacks These jacks accept the banana type plugs of either the reusable or disposable bipolar cords Figure 6 Front Panel Connections item EE FF Pneumatic Footpedal Receptacle Accepts the connector of the pneumatic footpedal GG Irrigator Receptacle You may plug the CMC II Adapter Cable catalog no 80 1179 into the generator here to use the MALIS Irrigation Module catalog no 80 1164 and or the MALIS Bipedal Electric Footswitch catalog no 80 1149 along with the CMC III Refer to the set up instructions in the manual supplied with the adapter cable for more information NOTE To avoid unintentional irrigation be sure the power on the Irrigation Module is switched to the OFF position whenever the power switch on the CMC II generator is in the OFF position HH Power Receptacie This receptacle accepts the three prong power cord plug and also contains the supply voltage selector and external fuses See Technical Specifications ll Equipotential Connector Use this terminal to connect a potential equalization conductor to a busbar in rooms where potential equalization is required mj wi 1 i il pren ail E nm emm o Figure 7 Back Panel Connections Items FF through Il 6 0 TECHNICAL DESCRIPTION 6 1 PRINTED CIRCUIT BOARDS PCBs 6 1 1 Mother Board The Mother Board consists of low voltage power supplies an infrared remote c
15. RF power waveform from saturating T502 and interfering with the low level detection circuitry 6 2 2 Display Board 6 2 2 1 Front Panel Numeric LEDs LED101 through LED108 are driven by U101 through U108 r ively Data from the 8 Bit Data Bus DB 0 7 are latched into U101 U108 from control signals supplied by U109 U110 and U111 The latched information is decoded hexa decimal to 7 segments and drives the numeric LED displays Steering logic consisting of U109 through U111 supply control signals to U101 through U108 The N1 signal selects the most significant byte of the Cut and Coag displays the decimal points used on the Microcut and Coag displays as well as the two least significant bytes on the Cut Microcut and Coag displays The N1 N2 HPCUT LPCUT and COAG signals combine respectively to select the proper numeric LED display The HPCUT LPCUT COAG BLINK and FTPDON signals combine to flash the selected numeric LED display when RF power output is requested 6 2 2 2 Front Panel Single LEDs The HPCUT LPCUT COAG and FTPDON signals are combined selectively to tum on the HPCUT LPCUT or COAG mode display LED lamp The FTPDON signal turns on the Generator LED when RF output power is requested The MUTELED signal turns on the Mute LED when voice muting is requested The IRGLED signal turns on the Irrigate LED when irrigation is requested The WATTSLED signal turns on the Watts LED when the watts display mode
16. TPB signals are synchronous 6 2 3 7 Selectin Data to be input to the 8 bit data bus are transmitted through U216 U217 U218 U219 U237 and U238 when the N3 N5 N6 and MWR signals are syn chronous 6 2 3 8 Digital to Analog Converter DAC The DAC takes information from the 8 bit data bus and converts it to analog voltage information used by the High Voltage Power Supply Eight bits of hexa decimal data corresponds to 256 units of decimal data as is applied to the DAC HEX data are loaded into the DAC when the N4 and MRD signals are synchronous The value of the 4 75 VDC reference output from the DAC will be N 256 4 75 VDC with N hexadecimal value input to DAC 6 2 3 9 Randomizer Control While pseudorandomization data ary for coagulation is primarily maintained by a data table in the EPROM and controlled by the uP U225 assists the uP by providing delays not otherwise obtainable by the uP itself When N7 is asserted data from the 8 bit data bus are loaded into an 8 bit binary down counter U225 U225 is clocked down at 1 Mhz Therefore each data byte latched into the counter inputs represents a delay in one microsecond increments us e g hex 10 10 ps hex 3B 59 us The delay is used to control the start of the coagula tion waveform bursts When U225 is finished down counting a given data byte it signals the P via the EF 1 flag line input 6 2 3 10 Coagulation Waveform Control The coag waveform gener
17. The MALIS Bipolar Electrosurgical System CMC III Service Manual PROFESSIONAL INC RAYNHAM MA 02767 0350 USA Malis is a trademark of Leonard Malis M D CMC is a registered trademark of Johnson amp Johnson Professional inc TABLE OF CONTENTS 116 SUNS aeaa aman IFC 20 Watan cnrs a IE 3 0 Service and Repair ccccsceesecssssens IFC 4 0 Warnings and Cautions 008 IFC 5 0 Functional Description of Controls and Indicators 1 5 1 Product Description sssessssssicesssassssseseonse 1 5 2 Generator Controls E E AAEE 1 5 3 Remote Control Set Controls 2 5 4 Footpedal Controls rn SS MOCNO snc 5 6 Connections E A E E A A E E AEN 4 6 0 Technical Description osssssesessssssssnsesassss 4 6 1 Printed Circuit Boards c0 0000 4 6 2 Theory of Operation PPE E PEPEE 5 6 3 Master List of Card Connector Signals ceccssssesssessseees 10 6 4 Test Points AA EE A N AREER A I 6 5 Operational Paclormane EE 12 6 6 CAIO sicincissccccicccinascasicensecenenaaaesis 12 6 7 Technical Specifications Siena 13 6 8 Trouble Shooting Guide 14 7 0 Replacing Internal Fuses 14 5 0 MERWNGROS snn 15 9 0 Routine Cleaning e ssssssasssorssisssssssssssacsases TO 10 0 Sterilizati n ji tisiscccssccninniiaincanmeava 1 11 0 Block Diagrams
18. arator U401A s trip point is modified by U404A At DAC reference voltages up to 3 VDC U404A acts linearly above 3 VDC U404A clamps The purpose of this circuit is to prevent excessive high DC voltage overshoot during periods of light or no load while output DC voltages are less than 125 VDC With DAC voltages above 3 VDC greater than 125 VDC at the output the overshoot problem is minimal Additional over current protection is provided by U409 When current exceeds 10 amps at the output of the high voltage power supply the PWM controller U403 shuts down and a signal SCMONI is transmit ted to the uP for error contro handling error code 02 The purpose of this additional circuit is to prevent destruction of the power supply and RF Amplifier 6 2 5 4 Isolated FET Q400 Drive The PWM controller s clock provides an isolated bias voltage for FET driver U402 Clock signal SYNC drives U406 Q404 and T403 T403 provides isolation between off line and post off line sides The A drive signal from the output of U403 drives Q401 T402 U402 and FET Q400 T402 also provides isolation 6 2 5 5 The flyback transformer T400 operates in the discontinuous mode for light loads That is T400 s primary current starts at zero and secondary current drops to zero during each cycle The flyback trans former operates in the continuous mode for heavier or transient load conditions The continuous mode of operation is characterized by no
19. ator consists of two 8 bit shift registers U226 and U227 wired together to form a 16 bit word After receiving a start pulse to the Shift Load input pin 15 from the randomizer control U226 and U227 output pulses from pin 13 at a 0 5 ps rate due to a 2 Mhz signal to the clock input The logic level of the output pulses is deter mined by the fixed inputs A through H of U226 and U227 The final digital waveform is used by the RF Power Amplifier to form a damped coagulation waveshape Timing is as follows a 2 0 us low e 1 0 us low b 0 5 us high A 1 0 us high c 1 5 us low g 0 5 us low d 1 0 us high U226 and U227 are locked out during the cutting mode since they are not required 6 2 3 11 8 Mhz Shifter The coagulation waveform requires that the base frequency of 1 Mhz be shifted approximately 4 The base waveform is synthesized with a phase locked loop PLL U228 whose voltage controlled oscillator VCO output is approximately 8 Mhz The 8 Mhz from the VCO is divided down by U229 and fed back to one reference input of the PLL The second reference input is connected to a 62 5 Khz reference clock The U229 divider has been de signed to divide at a ratio that provides a near 62 5 Khz output When the U229 divider ratio is changed and shifted by a 488 Hz clock the output of the PLL VCO U228 is 8 Mhz 4 at a change rate of 488 Hz Further division of the shifted 8 Mhz waveform is handled by the 1 Mh
20. both the AC and off line DC voltages simultaneously for safety A line voltage auto switch mechanism is employed to select proper connection to either 100 120 or 220 240 VAC Relay K400 has a 120 VAC coil connected across the primary of low voltage transformer T701 so that when T701 is operated at 220 240 VAC no AC voltage is presented to K400 and the diode bridge DB400 operates as a full wave bridge rectifier When T701 is operated at 100 120 VAC K400 energizes and forces the diode bridge DB400 and capacitors C401 and C402 to operate as a voltage doubler system Relay K400 initially defaults to the 220 240 mode for safety RT400 and RT401 provide inrush current limiting R400 and R401 provide voltage balancing due to unequal leakage currents in C401 and C402 R402 provides a shorter discharge time for C401 and C402 when K401 is de energized Unloaded off line voltage is approximately 330 VDC High DC voltage monitoring is provided by opto isolator U400 Two separate DC grounding systems are maintained isolated for off line and earth for post off line and chassis Unregulated high DC voltage is transferred from the off line side isolated to the post off line side earth ground referenced via FET Q400 and flyback transformer T400 Q400 is controlled by pulse width modulation PWM controller U403 and pulses T400 by PWM at 125 Khz During Q400 s off time flyback energy is transferred from T400 s primary to T400 s isolated secon
21. dary winding R404 R405 C403 and C404 comprise two snubber circuits to prevent destructive voltages from destroying Q400 Flyback energy is rectified by D402 and filtered by C405 Regulated DC voltage is now available to the RF Power Amplifier R449 and C440 provide snubber protection for D402 Input to the PWM controller U403 is derived from several sources and combined before being input to U403 pin 9 The purpose of U403 is to maintain voltage regulation from several volts to as much as 225 VDC DAC voltage from the controller board is first buffered by U404B and then is applied to two locations U404A and U401B 6 2 5 2 Voltage Sensing U401B compares DAC voltage and scaled down high DC voltage from C405 The resultant output signal from U401B VCNTL is applied to the data input on flip flop U405A VCNTL is combined with SYNC from the PWM controller U403 The output of flip flop U405A is then applied to U403 pin 9 the shutdown input Scaled down high DC voltage that exceeds the DAC reference voltage causes shutdown of the PWM controller U403 Synchronizing SYNC is used to preclude sporadic duty cycle pulses from occurring and causing premature shutdown of U403 6 2 5 3 Current Sensing DC pulse current through Q400 and T400 is isolated and monitored through current transformer T401 and then applied to U401A If peak current exceeds the reference set by the DAC voltage the PWM controller U403 is shutdown Comp
22. e remote control set C Coagulation Power Control Switch Increases and decreases the power settings for coagulation Coagulation power control buttons are also found on the remote control set D Tone Volume Control Used to control the volume of the tones which indicate cutting or coagulation power is being delivered to forceps You can change the tone volume at any time during the operation of the CMC III except while cutting or coagulating While you are using these controls the tone volume settings appear in the Microcut Power Display Window Item V in Figure 5 Afterwards the display window again shows the actual microcut power setting Figure 1 Front Panel Controls Items A through E Voice Volume Control Used to increase or decrease the volume of the voice synthesizer which announces the operating mode being employed and changes in the power settings You can increase or decrease the voice volume at any time while using the CMC IIl except during cutting or coagulating While you are using these controls the voice volume settings appear in the Microcut Power Display Window Item V in Figure 5 Afterwards the display window again shows the actual microcut power setting F Cutting Reset Button By pushing this button you can immediately reset the cutting power to 35 Malis Units or 9 watts CODMAN is a registered trademark of Johnson amp Johnson Professional linc G Coagulation Reset Button You
23. emory error a Two front panel setting controls pressed simultaneously 9 Voice indicator announces Error 10 Voice indicator announces Footpedal error a Two footpedals pressed simultaneously 11 Voice indicator announces a Operating malfunction Internal power error 7 0 REPLACING INTERNAL FUSES Significant changes in the supply voltage setting such as from 110 120V to 220 240V require a change in two internal fuses Fuses F400 and F402 are located on the power supply board Figure 10 shows the location of the power supply board in the CMC IIl chassis 1 Disconnect the generator from the power supply 2 Remove the six Phillips head screws and wash ers holding the cover in place Remove the cover 3 Remove the Phillips head screw Item A in Figure 10 that holds the power supply board to the metal bracket Correction a Replace fuse b Check plug for wiring c Check electrical service a Adjust to 120 220 or 240 volts nominal as appropriate b Use 50 ohm noninductive load for coag and microcut 400 ohm for regular cut c Return for service and recalibration a Gently clean plug surfaces with abrasive cloth b Replace forceps cord a Replace forceps cord a Check for shorting to core case Return for service and recalibration a Return for service and recalibration a Replace internal fuse a Return for service a Use care when pressing controls a Use care when depressing
24. eration is as follows A small lt 3 V P P audio signal of approximately 20 Khz is generated by U602 in the form of a sine wave buffered by Q600 and capacitor coupled to transformer T502 and C529 This is the 2OKHZOUT signal The primary of T502 and capacitor C529 form a parallel resonant circuit Signal 2OKHZIN is a path to a filter buffer U603B detector and threshold comparator U603A Providing there is essentially an open across the secondary winding of T502 forceps open the parallel resonant circuit acts to impede the flow of the 20 Khz sine wave from 20KHZOUT to 20 KHZIN During this period of open forceps U603A toggles on and asserts the PWRDIS signal to U503 on the RF Amplifier Board thereby shutting off RF power If the forceps should see resistance under 5000 ohms the secondary winding of T502 acts to reflect this impedance back to the primary winding of T502 and lower the Q of the parallel resonant circuit thereby allowing the 20 Khz sine wave to pass from 20 KHZOUT to 20 KHZIN This signal level is detected by D600 and D601 causing comparator U603A to change state and allow the RF amplifier to operate Time delay is built into the detector circuit to allow continuous application of RF power during short periods of open circuit After approximately 0 5 seconds of open circuit at the forceps RF power is extinguished L504 and C530 on the RF Amplifier Board is a senes resonant circuit that acts to prevent the 1 Mhz
25. erator cabinet may be cleaned with a damp cloth or sponge Use alcohol or mild cleaning solutions to remove stains or adhesives that stick to the cabinet DO NOT immerse the MAUS CMC III generator or remote control in any liquid Subjecting the generator to excessive mois ture may damage the electronic components and violate the warranty The CMC IIl footpedal may be washed with normally used hospital cleaning liquids Do not allow liquid to enter the white plastic footpedal connector 10 0 STERILIZATION Never sterilize the MALIS CMC IIl generator pneu matic footpedal electric footswitch remote control or connecting cable Place the remote into a sterile plastic bag similar to those supplied for operating room cameras The Integrated Irrigation Tubing and Cord Set is a single use device sold sterile Do not resterilize 11 0 BLOCK DIAGRAMS
26. erator produces a tone whenever power is delivered to the forceps Two different tones are employed to differentiate between coagu lation and cutting A low frequency major chord indicates coagulation A higher frequency minor chord indicates cutting You can control the volume of the tone indicator with the tone volume control Item D in Figure 10 Voice Indicator not shown The voice indicator enables you to check or adjust the power setting and mode of operation without removing your eyes from the surgical site As you change the power setting the voice indicator announces each new setting When you use the Cut switch on either the remote control set or the footpedal the voice announces either Microcut or Cutting It also announces the power setting before the generator delivers either cutting or coagulating power to the forceps You can use the voice volume control Item E in Figure 1 to change In addition the voice indicator functions as part of the self diagnostic feature for the five conditions shown below Internal Fuse Indicates an internal fuse must be replaced Operating malfunction indicates the two front panel power setting controls were pressed simultaneously Indicates that both footpedals were pressed simultaneously Memory Error Error Footpedal Error Internal Power Error Operating malfunction Refer to the Section 6 8 Troubleshooting Guide for further information 5 6 CO
27. g selection of cut or coag power control high for up and low for down VOICEDN Low going signal to I O indicating depression of the Voice Volume Down switch Low going signal to O indicating depression of the Voice Volume Up switch Digital signal to volume controls on sound board representing volume direction VOICEUP VOLUPDN WATTSLED High going signal from I O indicating selection of watts LED Low going signal to O indicating depression of the Watts switch 20 Khz approximate sine wave from output of open circuit detector filter 20 Khz approximate sine wave to input of open circuit detector filter 0 to 225 VDC 2 Amps from HVPS to RF AMP 6 4 TEST POINTS Eleven test points are available to facilitate trouble shooting All test pins are easily accessed at the top of the controller board on P203 Figure 8 Activate test functions by grounding momentarily or con stantly refer to each section for details the appropri ate pin Note that some test points provide dual function capability WATTSW 20KHZIN 20KHZOUT 200V 6 4 1 Pin 1 Display Test Power Up Momentarily grounding this pin provides a complete sequential test of all LEDs lamps and numeric LEDs For Power Up see 6 4 4 Calibrate On Off Pin 1 P203 t Re 4 e i lt ysl F e uit THETA Figure 8 Controller Board Layout 6 4 2 Pin 2 Sound Test Power Down Momentarily grounding this point provides a complete sequential test
28. is latched into U207 and U208 U201D and U233C provide enabling disabling signals to all the memory devices to avoid conflicting with one another 6 2 3 3 Clock Generator The clock generator includes a stable 8 Mhz crystal and two ripple dividers U202 and U203 Ripple dividing provides continual phase coherent division from 4 Mhz to 25Hz in divide by two steps Ap proximately eight taps are used by devices on the controller board 6 2 3 4 Watchdog Timer The watchdog timer U206 provides a reset pulse to the pP when one of the following occurs a power up or b no signal to U206 pin 6 watchdog input WDI within 1 to 2 5 seconds continually This guards against unit malfunctioning due to pP hang ups and temporary low supply voltage condi tions 6 2 3 5 Clock Synchronizer The uP internal clock divider is synchronized with the external clock generator A flip flop U231B whose output changes only with a rising clock edge on the clock input is supplied with a 500 Khz clock The 500 Khz clock is the equivalent of the intemal clock frequency of the pP When the watchdog timer signals a clear to both the synchro circuit U231B and the pP the rising edges of both the 4 Mhz and 500 Khz clocks are aligned and the uP starts running synchronously with the master clock generator 6 2 3 6 Select Out Data to be output from the 8 bit data bus are latched into U212 U213 U214 and U215 when the N5 N6 MRD and
29. is requested 6 2 2 3 Front Panel Switches The UP DN signal is produced by the RF power control rocker switches 101 and S102 The CUTSTREB signal is produced by the Cut RF power control switch S101 The COAGSTRB signal is produced by the Coag RF power control switch 102 The IRIGSW signal is produced by the Irrigator control switch S103 The WATTSW signal is produced by the Watts switch S104 The CUTRST signal is produced by the Cut Reset switch S105 The COAGRST signal is produced by the Coag Reset switch 106 6 2 2 4 On Card Signals LPDP High going signal indicating selection of the microcut decimal point CGDP High going signal indicating selection of the coag decimal point 6 2 3 Controller Board 6 2 3 1 Microprocessor The microprocessor has an 8 bit bidirectional data bus DB 0 7 16 bit memory addressing 64k and appropriate timing indicators TPA TPB MRD MRW 8 device I O selection N lines 4 external flag line inputs EF1 to EF 4 external interrupt INT internal countdown timer and 64 byte random access memory RAM An N line decoder U205 provides one of eight operation of I O devices N1 to N7 6 2 3 2 Memory The memory circuit has fully demultiplexed 16 bit addressing to allow 64k bytes of data Memory consists of one 27128 EPROM 16k bytes one 2805 EEPROM 0 5k bytes and a 64 byte RAM in the uP Upper 8 bit addressing of 16 bits occurs during the Timing Pulse A TPA period and
30. n the isolated output and in the lower power requirements The output of the bipolar generator should be isolated from ground as much as possible so all current flow takes place between the two tips of the separated forceps There should be virtually no current flow from either side of the forceps to ground The current geometry will now be depen dent upon the tip size and the angle at which the tips meet as well as the medium in which they are immersed If the forceps blades are virtually paral lel and the forceps are deep in saline there will be major shunting in the saline If the forceps are bowed or angled so the tips almost meet while the blades are still well separated the current flow will be mainly between the tips with little shunting The lowest possible generator output impedance pro vides the best maintenance of power at the forceps tips with the least decrease in coagulation due to shunting The MALIS Bipolar Electrosurgical System CMC III provides the higher energy output needed for rapid cutting of all tissues including dense fibrous layers shifting the low impedance of the micro cutting automatically to match the power requirements of the high power cut settings 5 2 GENERATOR CONTROLS Figures 1 and 2 A Power Switch Controls the power supplied to the coagulator B Cutting Power Control Switch Used to increase or decrease the power settings for cutting Cutting power control buttons are also located on th
31. nd the user insure MAXIMUM PHYSI CAL SEPARATION of this unit from any other electrosurgical device and its cables 5 0 FUNCTIONAL DESCRIPTION OF CONTROLS AND INDICATORS 5 1 PRODUCT DESCRIPTION The MALIS Bipolar Electrosurgical System CMC III catalog no 80 1170 includes 1 The Generator 2 Awireless Remote Control for changing power settings as well as operating the cutting and coagu lation functions 3 An Adapter Cable to allow the use of a MALIS Irrigator and or a MALIS Bipedal Electric Footswitch with the CMC III The generator is compatible with both a pneumatic footswitch catalog no 80 1173 and an electric footswitch catalog no 80 1149 both available separately The generator is equipped with a voice synthesizer that provides an audible indication of changes to the power settings At the surgeon s option it also announces the operating mode and power setting each time cutting or coagulation is pertormed With the exception of the generator all the above system components may also be ordered separately MALIS Bipolar Cutting Forceps and standard insulated and noninsulated forceps are available separately as are reusable and disposable bipolar cords The System may be used with the MALIS Irrigation Module catalog no 80 1164 The CODMAN Floorstand for MALIS CMC II III is designed to accommodate the CMC III Generator and the Irrigator together In bipolar coagulation the electrical difference is only i
32. nzero primary current at the start of each cycle where the primary current immediately steps up then ramps linearly i e ramp on pedestal waveform Normal Operation Flyback Mode 6 2 5 6 On Card Signals ACIN_ 120 240 VAC input to diode bridge DACOUT Buffered DAC output voltage PWM Pulse width modulated signal from PWM controller to power FET SYNC Buffered clock signal from PWM control ler U403 VCNTL Signal from output of voltage sense comparator 15V ISO Isolated 15 volt bias supply for power FET driver 6 2 6 RF Power Amplifier Board 6 2 6 1 RF Bridge Amplifier The RF Bridge Amplifier is of the H bridge design Each vertical half leg of the H is an FET suitably driven at 1 Mhz The drive signals are Q1Mhz and Q iMhz See description under Controller Board Each alternate half leg i e top left bottom right bottom left top right is driven in phase Voltage is supplied from the coag waveform generator to the top half legs of the bridge amp top left top right marked BRIDGE The load T501 is placed as the horizontal bridge across the middle of the two vertical elements 6 2 6 2 Coag Waveform Generator DC voltage to power the RF Bridge Amplifier is controlled by the coag waveform signal driving Q501 When in the cut mode Q501 is fully satu rated and allows pass through of the voltage from the High Voltage Power Supply During the coag mode the coag waveform signal see description in Controller Board
33. of all Digitalker words tones and voice tone volume control functions For Power Down see Calibrate On Off 6 4 3 Pin 3 Deactivate PWM Grounding this point turns off the PWM controller IC on the High Voltage Power Supply The message output power is off announces and LED 201 turns on This test mode allows full functioning of the CMC IIl except for output power Its purpose is to zero out the high voltage available to the RF Power Amplifier Unregulated high voltage DC however remains on the High Voltage Power Supply board and must be approached with caution Removing the ground turns off LED 201 and the unit announces output power is on 6 4 4 Pin 4 Calibrate ON OFF Grounding this pin enables the calibration function by announcing calibrate output power Refer to Section 6 6 Calibration for details 6 4 5 Pin 5 Factory Profile This test point can be activated only when there is a problem with the EEPROM This can occur during first time power up with a blank EEPROM or when the EEPROM malfunctions When momentarily grounded the unit announces recycle memory and reprograms the EEPROM Transferring data is seen in the coag display When finished the unit an nounces memory is correct assuming no EEPROM problems and then reinitializes the CMC III With an error condition the unit announces internal memory error and flashes 01 in the microcut display 6 4 6 Pin 6 RAM Read Grounding this test poin
34. of the RF bridge amplifier and the coag waveform generator These stages float with respect to earth ground when operating and must have the Isolated Bias Supplies 6 2 6 6 On Card Signals BRIDGE Modulated DC voltage during coag from coag waveform generator filter to RF bridge amplifier isolated 7 5 VDC bias power supplies to RF bridge amplifier and coag waveform generator Isolated grounds of bias power sup plies to RF bridge amplifier and coag waveform generator Signal from output of short circuit detectors to disable RF output Isolated Bias Supplies ISO 7V n ISOGND n PWRDIS 10 SCRES1 SCRES2 SCRESS3 SCRES4 Short circuit current through R525 to input of coag low power cut short circuit detector Short circuit current through R525 to input of coag low power cut short circuit detector Short circuit current through R524 to input of high power cut short circuit detector Short circuit current through R524 to input of high power cut short circuit detector 6 3 MASTER LIST OF CARD CONNEC TOR SIGNALS A DIN BLINK COAG COAGFTSW COAGRST COAGSTRB COAGWVFM CUTFTSW CUTRST CUTRLY CUTSTRB DAC DB O 7 EF3 FTPDON HPCUT HVALY IRIGLED IRIGSW IRRECV 0 to 5 VDC signal to the analog to digital converter ADC 1 Hz signal 75 on 25 off High going signal from I O indicating selection of coag mode Low going signal to O indicating depression of coag footswitch
35. ontrol receiver open circuit detector pneumatic footswitches tone and voice volume control switches RF output DC blocking Capacitors and all cardedge connectors necessary for joining the printed circuit boards 6 1 2 Display Board The Display Board consists of numeric Light Emitting Diode LED displays single LEDs pushbutton and rocker type switches 6 1 3 Controller Board The Controller Board houses an 8 bit RCA HARRIS 1805 microprocessor uP Also included are clocks watchdog timer clock synchronizer and input output I O control N lines 6 1 4 Sound Board The Sound Board consists of a Digitalker EPROM digital tone generators steering logic audio filters amplifiers and two electronic volume controls for voice and tones 6 1 5 High Voltage Power Supply Board The High Voltage Power Supply Board is an off line switching type power supply utilizing the flyback principle of voltage transfer and isolation from power line mains sources 6 1 6 RF Power Amplifier Board The RF Amplifier Board consists of a bridge type RF amplifier coagulation waveform generator RF output steering short circuit detection and isolated bias supplies 6 2 THEORY OF OPERATION NOTE Refer to each board s block diagram and schematic Sections 8 0 and 9 0 respectively Mother Board Low Voltage Power Supplies 6 2 1 6 2 1 1 Four low voltages are supplied on the mother board a 5 VDC 2 Amps regulated b 15
36. ow going signal to Display board indicating selection of LED test mode High going signal from uP indicating a memory read function High going signal from I O indicating selection of mute LED Low going signal to O indicating depression of the mute switch High going signal from uP indicating a memory write function Low going signal to O indicating unregulated high voltage DC is present on the High Voltage Power Supply HVPS board Output select for displays on display board Output select for Digitalker and volume controls input select for O Low going signal to I O indicating an open forceps condition Low going signal to HVPS indicating selection of pulse width modulator PWM IC to start output voltage supply to RFAMP Additional low going signal from output of open circuit detector to RF AMP to disable RF output Digital 1 Mhz signal with a 37 on duty cycle Same as Q1MHZ but 180 out of phase RF output power to patient output jacks RF output power to patient output jacks Low going signal to I O indicating an overcurrent condition on the HVPS Low going signal to volume controls on Sound board indicating selection of voice volume control Low going signal to I O indicating depression of the Tone Volume Down switch Low going signal to I O indicating depression of the Tone Volume Up switch Low going signal to volume controls on Sound board indicating selection of tone volume control Signal to I O indicatin
37. ry address bytes TPB High going signal from P indicating selec tion of low order memory address bytes 6 2 4 Sound Board 6 2 4 1 Digitalker The Digitalker U301 is started by a write pulse to U301 pin 4 from N3 and simultaneous data from the 8 bit data bus Information written to the Digitalker determines which word is to be selected from the word list The word list is stored in the EPROM U203 Digital voice audio from U301 pin 39 is buffered and filtered by U303 6 2 4 2 Tone Generator Tone generators consist of U305 U306 and U307 One tone 390 Hz is shared by both cut and coag modes U305D determines which of the two other tone oscillators are used The tones are squeiched whenever there is no footpedal activity or the Digitalker is accessed 6 2 4 3 Volume Control U309 and U310 are electronic volume control devices The TONEVOL and TALKVOL signals determine selection of either U309 tone or U310 voice The VOLUPDN signal determines the direction of volume either up or down The N3 signal strobes U309 and U310 for volume control function The outputs of U309 and U310 are fed to U304 for final amplification to the speaker The DLY signal provides a small time delay upon power up to quiet down the Digitalker and tone generators U301 pin 6 generates an interrupt to external flag line 3 EF3 of the uP when the Digitalker is active 6 2 5 High Voltage Power Supply Board 6 2 5 1 General Relay K401 breaks
38. s deliv ered to the forceps The Cut pedal on the footpedal Item R in Figure 4 also controls this function N Coagulation Output Button By pressing this button you cause coagulation power to be delivered to the forceps The Coag pedal on the footpedal Item S in Figure 4 also controls this function O Coagulation Power Control Button Use this button to increase or decrease the power setting for coagulation The Coag Power Control Switch on the generator Item C in Figure 1 controls the same function P Cutting Power Control Button Increase or decrease the power setting for cutting by means of this button The Cutting Power Control Switch on the generator Item B in Figure 1 controls the same function Q Irrigation Mode Button When the MALIS Irrigator is properly set up and connected to the CMC III push this button to disable and enable irrigation An additional irrigator button is located on the generator The Irrigation Mode Indicator Figure 5 Item AA located on the genera tor illuminates when the irrigator is enabled regard less of which of the two switches is used Figure 3 Remote Control Items M through Q 5 4 FOOTPEDAL CONTROLS Figure 4 R Cutting Output Pedal When you depress this pedal cutting power is delivered to the forceps The Cut button on the remote control Item M as shown in Figure 3 also controls this function COAG Cat nO 60 1173 Figure 4 Pneumatic Footpedal
39. t causes an instantly calcu lated checksum of the EEPROM to be compared with the checksum stored within the EEPROM The compared values show on the high power cut and coag displays If the compared sums are equal the unit announces internal memory is correct When this test point is ungrounded the unit reinitializes 6 4 7 Pin 7 Factory Test Grounding this test point causes the unit to announce internal power recycle on This mode is available for factory use only It is recommended that this test point NOT BE ACCESSED 6 4 8 Pin 8 DAC Reference Voltmeter test point DAC reference input voltage should be 4 75 VDC 05 volts 6 4 9 Pin 9 DAC Output Voltmeter test point DAC output voltage When in calibrate mode this voltage can be compared against the displayed DAC value shown on the numeric LED display The DAC output voltage should be DAC display 255 DAC reference voltage 6 4 10 Pin 10 ADC Input Not used 6 4 11 Pin 11 NOHV Bypass Grounding this test point allows operation of the CMC III with the High Voltage Power Supply board removed It requires that the two High Voltage Power Supply board connectors J403 and P404 be con nected together to provide AC power to the low voltage power supply transformer T701 This test point must be ungrounded for normal operation with the High Voltage Power Supply connected 11 12 6 5 OPERATIONAL PERFORMANCE The MALIS Bipolar Electrosurgical System CMC III ma
40. tive resistor load Micro Cut 10 settings 72 16 8 watts into 50 ohm noninductive resistor load Cutting 10 settings 20 200 watts into 400 ohm non inductive resistor load Output Setting Indications Visual Three digit indicators except micro cut which is two digit Aural Voice annunciator synthesizer Power Controls AC ON OFF Switch RF Output Panel mounted three position rocker types Panel Connectors Bipolar Two high voltage jacks Cooling Convection no fan Weight 21 Ib 10 4kg Dimensions 8 2H x 12 W x 17D inches 21 6H x 32 4W x 43 2D centimeters Minimum Operating Temperature 50 F 10 C Remote Control Power Source Two 1 5v AAA alkaline batteries 13 14 6 8 TROUBLE SHOOTING GUIDE Symptoms Probable Cause a Blown fuse b Loose wire at power cord plug c No power at wall outlet 1 Unit does not operate Power on indicator light 2 Low power output a Low line voltage b Incorrect test load c Internal calibration change a Loose or dirty connections between forceps cord and jacks b Intermittent break in forceps cord 3 Erratic power output 4 No power output a Broken wire in forceps cord 5 Excessive leakage current a Shorted output transformer 6 Excessive power output a Internal calibration change 7 Voice indicator announces a Blown internal fuse Internal fuse Power Setting Display flashes OO 8 Voice indicator announces a Operating malfunction M
41. tomer Service 1 800 225 0460 The sales representative coordinates the return to Codman Repair Service c o Johnson amp Johnson Professional Inc 4969 Wakefield Street Philadelphia PA 19144 Include with the unit a repair purchase order number the serial number of the generator and a written description of the problem The MALIS CMC III Remote Control is not repairable Replacements are available from Johnson amp Johnson Professional Inc 325 Paramount Drive Raynham MA 02767 0350 4 0 WARNINGS AND CAUTIONS 4 1 WARNINGS Do not attempt to bypass the grounding prong on the generator by using a 3 prong to 2 prong adaptor The generator must be properly grounded to ensure operator and patient safety Grounding reliability can be achieved only when connected to a recep tacle marked Hospital Only or Hospital Grade Always replace the system s fuse with the appropri ate type and value fuse see Technical Specifica tions The unit should not be modified in any way by any user Unauthorized modifications to the unit may cause it to malfunction or fail in use 4 2 CAUTIONS Continuous power output by either footpedal or remote control must be limited to 20 seconds with a 40 second rest period Close proximity of this unit and its cables with some Electrosurgical Units producing EXCESSIVE RF CURRENT RADIATION may cause this unit to produce voice annunciation and possibly output power We recomme
42. y be tested for operational performance using 50 ohm and 400 ohm noninductive test loads and RF ammeter or equivalent electrosurgical analyzer A test set up in the accompanying figure shows typical values for each power setting It should be noted that these are typical values and that output power may vary depending on line voltage load resistor tolerances and meter accuracy Figure 9 Test Set Up Typical Output vs Power Setting Coag Output into 50 ohms For reference only Power Setting Mode Malis Units Watts 0 7 1 0 1 6 3 5 7 9 11 14 IA 19 22 24 25 29 32 35 40 45 50 Use a 50 ohm 100 watt non inductive resistor for coag and micro cut modes Use a 400 ohm 250 watt non inductive resistor for high power cut mode Output Current RF amp 0 12 15 18 BERSSESRBRR Output Power Watts 0 72 1 1 1 6 2 9 5 1 7 2 9 3 11 5 14 1 16 8 19 2 21 3 23 3 25 2 28 9 32 0 35 3 39 6 45 1 50 0 Cut Output Power Setting Output Current Output Power Mode RF Amp Watts Malis Units Watts 8 07 12 0 72 i 40 15 1 1 15 16 18 1 6 3 24 29 Micro 25 5 32 5 1 Into Cut W 7 38 72 50 Ohms S B 43 93 a 4 48 11 5 45 14 53 14 1 50 17 58 16 8 60 20 22 20 0 FO 40 32 40 0 80 60 39 60 0 9 80 45 s0 N Cut 100 100 50 100 00 Into 1o 120 55 120 00 400 Ohms 120 140 59 140 00 1
43. z Split Phase Dead Zone Generator The 8 Mhz shifter circuit is locked to one frequency near 8 Mhz during the cutting mode 6 2 3 12 1 Mhz Split Phase Dead Zone Generator The RF Power Amplifier bridge field effect transistors FETs require a 1 Mhz signal However due to the turn off delay propagation nature of FETs a some what shorter duty cycle 37 on 63 off is required to prevent both halves of the bridge from turning on at the same time and reducing efficiency Eight Mhz from the 8 Mhz shifter circuit is sequentially divided by two through U230A U230B and U231A to 1 Mhz The outputs of U230A and U230B are ANDed together through U233D and delayed through U234A and U234B They are combined ORed with the 1 Mhz and 1Mhz outputs of U231A through U232A and U232C to form two 37 duty cycle waveforms Q1Mhz and Q 1Mhz The Q1Mhz and Q 1Mhz rising edges are shifted 180 from each other for proper RF bridge amplifier operation 6 2 3 13 On Card Signals EF1 Low going signal from the randomizer con troller U225 to external flag 1 input on uP EF2 Low going signal from A to D converter to external flag 2 input on pP ME Low going signal to uP indicating selection of internal 64 byte RAM N4 I O select of DAC or ADC N5 I O select N6 I O select N7 Output select of randomizer controller RLYDLY High going signal after delay to control high voltage relay TPA High going signal from pP indicating selec tion of high order memo
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