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Force 2 Electrosurgical Generator

1. 3 2 Force 2 Service Manual Controls Gontrols READY POLAR POLAR gt c 2 c 4 i w z L Standby Press this button to place the electrosurgical generator in a hold mode You cannot activate the generator and all audio alarms are silenced The generator s memory retains the power settings and the display shows dashes Ready Press this button to place the generator into service with power outputs displays and alarms fully functional Monopolar Press this button to select the monopolar footswitch control for activating the Accessory receptacle Bipolar Press this button to select the bipolar output when using the monopolar footswitch Power Up Press this button to increase power in the selected mode A single press of the button increases the power setting by one watt Continuously pressing the button gradually increases the power to maximum Power Down Press this button to decrease power in the selected mode A single press of the button lowers the power setting by one watt Continuously pressing the button gradually decreases the power to minimum Pure Cut Press this button to select cut with the lowest level of hemostasis Blend 1 Press this button to select cut with minimum hemostasis Blend 2 Press this button to select cut with moderate hemostasis Blend 3 Press this button to select cut with maximum hemostasis
2. Force 2 Service Manual so 224d999H pue S10 291pu 10409 JO uonduose Indicators Indicators l7 LD Power Control Pencil Mode The power control pencil feature does not have a dedicated button to access this mode Press the READY button and while holding it press the GUT POWER DOWN button The generator sounds a single tone and the RMOTE lamp illuminates Low Voltage Coag Low voltage coag does not have a dedicated button to access this mode Press the READY button and while holding it press the GOAG POWER DOWN button The generator displays an L in the hundreds digit of the coag power setting display Standby Indicator Indicates generator is on but cannot activate outputs Ready Indicator Indicates generator is ready for use Cut Mode Indicators One of four cut mode indicators illuminates to show the selected cut mode Power Setting Display The digital power setting display is visible on the generator in the ready mode The displayed number indicates the nominal power in watts When you activate the mode the generator delivers this power to the patient In the standby mode the generator display shows dashes Output Power Indicators The indicator illuminates when that output power cut coag bipolar activates One of the two distinct mode indicator tones sound in conjunction with the visual output power indicator Low Voltage Coag Mode Indicator
3. 234 024 091 234 201 364 234 024 081 236 010 008 234 201 385 234 024 127 234 014 453 234 024 047 234 024 097 234 024 096 Force 2 Service Manual ISI Sued 99196 Interface Board Valleylab Reference Designator Description Part Number R15 5k Q trimpot 236 010 006 R44 68k Q 5 1 4W 234 024 107 R23 560k Q 5 1 4W 234 024 129 R16 100k Q trimpot 236 010 011 R24 910k 5 1 4W 234 024 134 R17 200k Q 5 1 4W 234 024 118 R25 160 5 1 4W 234 024 116 R47 10 2k 1 1 8W 234 201 386 R67 390k Q 5 1 4W 234 024 125 R27 36 200k Q 1 1 8W 234 201 510 R46 66 887 Q 1 1 8W 234 201 284 R69 19 1k Q 1 1 8W 234 201 412 R70 33k 5 1 4W 234 024 099 Capacitors C58 61 0 22 uF 10 250V 204 400 120 C16 17 59 0 0047 20 10kV 204 200 243 C60 0 0047 HF 20 6kV 204 025 050 C2 5 10 11 18 19 21 23 24 31 33 0 1 20 50V 204 200 460 36 38 41 43 48 53 56 64 69 C1 6 9 12 14 20 25 29 37 39 40 42 1 uF 20 50V 204 200 464 47 54 57 65 68 034 55 240 pF 5 500V 204 300 331 C62 66 67 1000 pF 10 100V 204 200 454 C63 71 3300 pF 10 100V 204 200 455 C30 35 70 10 20 25V 204 600 067 Force 2 Service Manual Interface Board Valleylab Reference Designator Description Part Number C22 44 0 01 pF 10 100V 204 600 457 C15 10 pF 10 20V 204 600 064 Integrated Circuits U6 7 9 10 4049B 210 210 049 U1 8 LM
4. e Variable Resistor 0 to 150 ohms e Fluke Model 8920A True RMS Meter e Pearson Model 411 Wideband Current Transformer e Dale NH250 1 Noninductive Load Resistors Line Frequency Leakage Current Test Load 1k ohm parallel 0 15 pF 30 pF 20 6kV Ceramic Capacitor Plug the generator into a grounded receptacle do not use extension cords and or adapter plugs Turn the power on using the On Off switch on the rear panel The generator will conduct an internal self test during which a tone sounds digital displays show 8 s and indicators illuminate Ensure that all digit segments mode alert and power indicators illuminate If any of these indicators do not illuminate return the generator for service In five to seven seconds following the self test the generator enters the standby mode with the digital displays showing dashes Press the READY button to place the generator into service The power setting displays indicate one watt and the MONOPOLAR FOOTSWITCH indicator illuminates Force 2 Service Manual SajJnp300Jd SJUBUAIUIEJN Calibration Galibration Galibration Procedure You obtain the best performance if each adjustment is made to the exact setting If you use substitute equipment it must meet or exceed the specifications of the recommended equipment Also the manufacturer makes all calibrations in the procedure before Quality Assurance accepts the generator If you only need to recalibrate RF ou
5. sI0 eaIpu 10409 JO uonduose Rear Panel Functions Rear Panel Functions A BIPOLAR FOOTSWITCH Z 8 e MONOPOLAR FOOTSWITCH On Off Switch Press the toggle up to turn power on and down to shut power off The Force 2 generator uses a universal type power entry module but is not voltage selectable Line fuse replacement is the following 250V 8A 110 120V generators 2 PCH 250V 63 220 240V generators 8 PCH Bipolar Footswitch Receptacle This three pin receptacle accepts a single pedal bipolar footswitch connector Monopolar Footswitch Receptacle This four pin receptacle accepts a two pedal monopolar footswitch connector Equipotential Lug You can connect this lug to earth ground with an equipotential grounding cable Audio Volume Control When the generator activates it produces cut coag and bipolar mode indicator tones You adjust the volume of the tones with this control The volume of the audio alarm is not adjustable Force 2 Service Manual Technical Specifications In this section typical refers to a specification that is within 20 of a stated value Specifications subject to change without notice Standard Conditions of Measurement Unless otherwise specified all measurements are specified at an ambient temperature of 21 C 70 F and 760 torr Operating Parameters Temperature Range Humidity Range Atmospheric Pressure 10 C 50 F to 40 C
6. HFalleylab Service Manual Force 2 Electrosurgical Generator The following service instructions are for use only by personnel qualified to repair and service the equipment described in this manual This service manual covers the installation and basic service instructions for the Force 2 Electrosurgical Generator Also included are sections covering the technical specifications circuit descriptions and the testing of the generator Instructions for use and cautions and warnings concerning electrosurgery are in the Force 2 Electrosurgical Generator User s Guide supplied with the generator Federal USA law restricts this device to sale by or on the order of a physician Equipment covered in this manual Electrosurgical Generator Vac Nominal Hertz ForcerM 2 2 PCH 110 120 50 60 ForcerM 2 8 PCH 220 240 50 60 The Force 2 Electrosurgical Generator Service Manual consists of two parts the text part 1 of 2 and a Schematics Supplement part 2 of 2 which contains the schematics Valleylab part number 945 103 106 1 of 2 Effective date October 2004 Force 2 and REM are trademarks of Valleylab The Force 2 generator is protected by one or more of the following U S patents and their foreign counterparts 4 632 109 4 658 819 4 658 820 4 827 927 5 190 517 Manufactured by Valleylab a division of Tyco Healthcare Group LP Boulder CO 80301 3299 USA Tyco Healthcare UK Ltd Gosport PO13 0AS UK For inf
7. thereby lowering the frequency A filter consisting of R7 and C4 rolls off the high frequency components of the audio signal reducing the harshness of the audio tone A large filter R19 and C20 on the power input to U1 provides decoupling from the 5V supply RF Indicators The display driver does not control the RF indicators Port lines P24 through P27 buffered by U5D USC and USE drive the Cut and Bipolar RF power indicators Q5 further controls the indicators For the RF indicators to illuminate the presence of either the LMPTST or RF SENSE signals must turn on this transistor When you turn on the generator LMPTST performs a display test that turns on all of the display digits and indicators RF SENSE coming from the PSRF board activates whenever the ECON voltage reaches a level to provide usable output The 89C54 communicates directly with the ICM7218C that is the display driver is a device on the CPU s data bus For the CPU to read from or write to its peripherals the system must generate chip selects external to the CPU The falling edge of the address latch enable ALE line on the CPU indicates that a valid address is present on the data bus A 7415374 octal D type latch U9 latches the external memory address of the selected peripherals Force 2 Service Manual Suolduosad 1119119 Monopolar Control Display External Memory There are eight external memory locations To ensure accessing o
8. 100 2 1k x 5 1 4W 234 024 073 For 2 PCH only change R22 to 1 kQ 5 1 4W 234 024 063 Force 2 Service Manual Power Supply RF Board Valleylab Reference Designator Description Part Number R35 3k Q 5 1 4W 234 024 074 R33 34 37 39 3 3k 5 1 4W 234 024 075 R111 3 6k 5 1 4W 234 024 076 R36 3 9k Q 5 1 4W 234 024 077 R40 4 1k Q 5 1 4W 234 024 079 R94 4 75k Q 1 1 8W 234 201 354 R31 119 5 1 5 1 4W 234 024 080 R121 7 5k 5 1 4W 234 024 084 R28 38 47 50 53 55 58 66 87 90 10k Q 5 1 4W 234 024 087 91 93 103 115 128 132 143 144 R24 105 24k Q 5 1 4W 234 024 096 R18 30k Q 5 1 4W 234 024 098 R77 33k Q 5 1 4W 234 024 099 R106 43k Q 5 1 4W 234 024 102 R104 117 47k Q 5 1 4W 234 024 103 R85 82k Q 5 1 4W 234 024 109 R67 68 82 102 113 116 122 100k Q 5 1 4W 234 024 111 R92 107k Q x 1 1 8W 234 201 484 R25 220k 5 1 4W 234 024 119 R112 330k Q 5 1 4W 234 024 123 R65 97 1 5 1 4W 234 024 135 R123 124 20k Q 5 8W 234 000 017 R44 45 3 234 028 001 R13 15 2 Q x 5 7W 234 300 060 R19 1k Q trimpot 236 200 076 Force 2 Service Manual 8 9 ISI Sued 99196 Power Supply RF Board Valleylab Reference Designator Description Part Number R69 76 10k trimpot 236 200 079 R61 63 20k Q trimpot 236 200 080 R101 50k Q trimpot 236 200 082 R89 20k 5 1 4W 234 024 094 J11 13 0 Q jumper 234 3
9. 104 F 30 to 75 noncondensing 500 to 1060 millibar Storage and Shipping Temperature Range 18 C 0 F to 70 C 158 F Humidity Range 10 to 10076 noncondensing Atmospheric Pressure 500 to 2500 millibar Force 2 Service Manual 4 1 Output Waveform Output Waveform Cut 510 kHz sinusoid Blend 1 510 kHz bursts of sinusoid at 50 duty cycle recurring at 31 kHz Blend 2 510 kHz bursts of sinusoid at 37 5 duty cycle recurring at 31 kHz Blend 3 510 kHz bursts of sinusoid at 25 duty cycle recurring at 31 kHz Coag 510 kHz damped sinusoidal bursts with a repetition frequency of 31 kHz Low Volt Goag 510 kHz bursts of sinusoid at 25 duty cycle recurring at 31 kHz Bipolar 510 kHz sinusoid unmodulated PCH Generator Output Characteristics Nominal Maximum Power Crest Factor open circuit Rated Load atratedload at rated load P P voltage ohms watts typical Cut 3500 300 300 2 1 100W Blend 1 3800 300 250 3 4 100W Blend 2 4000 300 200 3 9 100W Blend 3 4000 300 150 4 7 100W Coag 7000 300 120 8 5 50W Low Voltage Coag 4000 300 99 4 7 99W Bipolar 1200 100 70 2 0 40W An indication of a waveform s ability to coagulate bleeders without a cutting effect Output Configuration Isolated output 4 2 Force 2 Service Manual Input Power Source Input Power Source Line Regulation Force 2 2 PCH Generator Maximum Operating Range 85 135 Vac Nominal Operating Range 110
10. U16 LM358AN 210 300 013 Transistors Q10 14 16 17 23 24 29 31 VN10KM 239 200 012 Diodes CR1 5 MUR8100E 239 850 033 Force 2 Service Manual 8 11 ISI Sued 99196 Power Supply RF Board Valleylab Reference Designator Description Part Number CR6 1N5817 239 700 005 8 10 11 13 15 20 25 28 1N4148 239 014 000 CR9 1N5233B 239 600 000 CR12 LM336 5 210 300 018 CR14 LM336 2 5 210 300 016 Miscellaneous F1 Force 2 2 PCH Fuse 6A 250V 215 005 039 F1 Force 2 8 PCH Fuse 6 3A 250V 215 100 041 K1 4 pole relay 230 007 002 RTI Thermistor 5 O 6A 240 003 005 L2 Inductor 0 75 mH 251 100 107 L1 Cut Inductor 251 100 108 1 Output Transformer 251 200 060 T2 Switching Transformer 251 200 061 T3 Dual Pulse Transformer 251 300 014 8 12 Force 2 Service Manual Heatsink Assembly Heatsink Assembly RF Out 202 701 789 Valleylab Reference Designator Description Part Number 01 4 Transistor FET BUZ80A 239 200 020 R6 500 500W TO 220 234 400 271 HVDC 202 701 790 Valleylab Reference Designator Description Part Number CR21 24 MUR 8100E 239 850 033 R142 150 20W TO 220 234 400 251 PS 202 701 791 Valleylab Reference Designator Description Part Number CR25 28 FET N Channel 500V 8A 239 200 022 R133 50 Q 20W TO 220 234 400 272 Bridge 400V 35A 239 700 067 Clamp 202 701 792 Valleylab Reference Designator Description Part Number Q5 FET N Channel 500V 8A 239 200 022 Q6 9 Transistor FET BUZ80A 239 200 0
11. 1 30 79 80 40 Fax 33 0 1 30 79 85 73 Tyco Healthcare Deutschland Tempelsweg 26 47918 Tonisvorst GERMANY Ph 49 0 2151 7096 92 Fax 49 0 2151 7096 67 For the UK Europe Middle East amp Africa Tyco Healthcare UK Limited Valleylab Service Centre Unit 1a Corinium Industrial Estate Raans Road Amersham Bucks HP6 6YJ UNITED KINGDOM Ph 44 0 1494 789200 FAX 44 0 1494 789239 Tyco Healthcare Italia SpA Via Gaetano Crespi 12 20134 Milano ITALY Ph 39 02 212181 Fax 39 02 2640059 Tyco Healthcare Spain S L C Fructuos Gelabert 6 8 planta 8a 08970 Saint Joan DESPI Barcelona SPAIN Ph 34 93 680 3370 Fax 34 93 680 2457 Tyco Healthcare Belgium B V Generaal De Wittelaan 9 5 B 2800 Mechelen BELGIUM Ph 32 15 298111 Fax 32 15 217987 Tyco Healthcare Austria GmbH Jochen Rindt Str 37 A 1230 Vienna AUSTRIA Ph 43 1 610 3441 Fax 43 1 615 3808 Tyco Healthcare Norden AB Denmark Finland Iceland Norway Sweden rsta ngsv gen 11 B li SE 117 43 Stockholm SWEDEN Ph 46 8 585 605 00 Fax 446 8 585 605 06 Tyco Healthcare PTY Ltd Service amp Technical Support 59 69 Halstead Street Hurstville NSW 2220 AUSTRALIA Ph 61 2 9579 6066 Toll free hotline 1800 350 702 Fax 61 2 9585 1908 Tyco Healthcare Japan Regulatory Affairs Department Technical Support Section Customer Call Center 1 2 20 Heiwajima Ota ku Tokyo to JAPAN Toll Free 0120 073 008 Ph 03 3764 07
12. An LM324 quad op amp U23 contains all of the amplifiers Capacitors C39 and C44 limit RF interference If the ECON and ICON signals do not track within a 10 window the Power Alarm circuit on the PSRF board enables an alarm signal the generator emits a constant audio tone and disables the RF output The REM indicator also comes on This alarm warns of possible CPU or DAC problems The third write memory location U6 is 74LS165 8 bit parallel in serial out shift register this register gates the principal RF clock frequency to generate the final RF drive envelope 7415374 octal D type latch U4 in the activation circuitry uses the fourth write location When the Force 2 is activated the microcontroller reads data on the bus The data identify which device is activate and in what mode It then writes this data to latch U4 Two 741585 digital comparators U7 and U10 compare this stored pattern to the ongoing activation input Any change in the activation input will cause the digital comparators to respond to the difference in inputs and subsequently to 5 4 Force 2 Service Manual Interface Interface deactivate the RF output and to begin to respond to the new activation or de activation input R27 and C29 provide time delay and moderate RF filtering to this line An 8 192 MHz crystal oscillator generates the required clock signal for 89C54 This oscillator also provides the clock drive for the RF waveform dr
13. CF Equipment per IEC 601 1 4 5 Drip Proof per IEC 601 1 4 5 Output Power vs Impedance Graphs 4 6 Section 5 Circuit Descriptions Bipolar Display 5 1 Monopolar Gontrol Display 5 1 Mode Indicators 5 2 REM and RMOTE Indicators 5 3 RF Indicators 5 3 External Memory 5 4 Interface 5 5 Power Supply 5 6 RF Output 5 7 Section 6 Maintenance Procedures Routine Maintenance and Inspections 6 1 Cleaning Instructions 6 1 General Testing Information 6 2 Recommended Test Equipment 6 3 Power Up Self Test 6 3 Calibration 6 4 Calibration Procedure 6 4 REM Test Procedure 6 7 Line Frequency 50 60 Hz Current Leakage Test Procedure 6 8 Bipolar and Monopolar Output RF Leakage Test Procedures 6 9 Typical Output Waveforms 6 10 TT on Waveforms at TP12 on PSRF Board 6 13 RF Drive Waveforms at TP7 10 on PSRF Board 6 13 Clamp Waveform at TP11 on PSRF Board 6 14 Components Replacement Guidelines 6 15 vi Force 2 Service Manual Section 7 Manufacturer Service Returning the Equipment for Service 7 1 Returning the Force 2 Generator 7 2 Returning Circuit Boards and Other Subassemblies 7 2 Section 8 Service Parts List Ordering Replacement Parts 8 1 Monopolar Control Display Board 8 2 Bipolar Display Board 8 4 Interface Board 8 5 Power Supply RF Board 8 8 Heatsink Assembly 8 13 RFOut 8 13 HVDC 8 13 PS 8 13 Clamp 8 13 Generator Base Assembly 8 14 Appendix A Warranty Schematics Supplement Assemblies and Sc
14. a one shot triggers by transformer primary voltages below 100V This one shot places a resistive load across the output and reduces high frequency risk currents The FET output is rather low impedance and the choice of DC supply voltage as the power control parameter limits its voltage compliance Above 300 ohms load the output resembles a constant voltage source Below 300 ohms load the current limit circuitry enforces a constant current characteristic All eight output FETs must be the same type The bipolar control adds an op amp to the power supply feedback path This amplifies the difference between the RF output peak voltage and the power supply set point voltage The difference is summed with the feedback supply voltage by injecting current into the feedback divider to reduce the supply under high impedance load conditions Current injection enables only in the bipolar mode 5 8 Force 2 Service Manual SECTIO Maintenance Procedures Routine Maintenance and Inspections Valleylab recommends that qualified service personnel inspect the Force 2 generator every six months Check the power cord assembly periodically for damaged insulation or connectors This service manual describes the recommended maintenance inspection testing and calibration procedures Return the generator to Valleylab for major repairs Repair parts and information are available from Valleylab Refer to Section 8 Service Parts List for addi
15. between the incremental settings is less than 150 mA Adjust R61 as needed to control leakage Increase power settings to maximum power b Select blend 3 and activate to 25 W and note leakage current Increment setting by 5 W until 45 W is reached and ensure that the hot spot between the incremental settings is less than 150 mA c Select coag and activate at 10 W and note leakage current Increment setting by 5 W until 25 W is reached and ensure that the hot spot between the incremental settings is less than 150 mA Increase to maximum power Monopolar Accessory Active RF Leakage Connect the 200 ohm load and RMS voltmeter in series from accessory active to chassis ground and connect a 30 pF capacitor between PATIENT receptacle and chassis ground Connect a variable resistance across the two pins within the Patient receptacle using a REM type connector Setthe resistance to 135 ohms and adjust R11 for the highest possible voltage on TP3 Turn R15 counterclockwise until EREM is below 4 V Turn R15 clockwise until REMFT TP5 goes high 5 V Monitor REM PW TP2 and adjust R16 until one period of square wave is 10 ms 0 5 ms Decrease the resistance to 50 ohms Increase the resistance gradually and record the value at which the REM alarm turns on 70 ohms 10 ohms Decrease the resistance and note that the REM alarm again turns off Decrease the resistance and record the value at which the REM alarm aga
16. multiplexed display driver on the Monopolar Control Display board The Bipolar Display board displays the bipolar RF indicator and the RF circuitry generates the signals An audio alarm is also present on this board Circuitry on the Microprocessor board performs the frequency select for the alarm A potentiometer on the rear panel controls the volume In the case of an alarm condition the board bypasses the volume potentiometer and a full volume alarm sounds The Monopolar Control Display board contains this circuitry Monopolar Control Display The Monopolar Control Display board also known as the CPU board has two major functions Serve as the main control element of the generator Provide the user interface As part of its control function the CPU board supports REM monitoring The board also supports adaptive REM monitoring but only when RF is inactive When functioning as the operator generator interface the CPU board receives all operator keyboard inputs and performs the proper functional response e g increment power register and display change mode and so forth Further it accepts all activation signals after the Interface board decodes them and performs the necessary steps to produce the desired RF output Force 2 Service Manual 5 1 Monopolar Control Display When functioning as the main control element of the generator the Monopolar Control Display board produces the proper RF drive according
17. return electrode monitor resistance to a triangle wave that an oscillator generates The CPU decodes this pulse width to implement the adaptive REM feature for dual pad resistances between 5 ohms and 135 ohms The high voltage DC power supply on the Power Supply board is an off line DC DC switching converter operating at 80 KHz A bridge rectifier two hold up capacitors and four power FETs in a bridge configuration supply the input power The FETs drive the power transformer T2 primary at 320V peak and varying duty cycles A 0 75 mH inductor and two 15 pF capacitors filter the power transformer rectified secondary voltage which convert a constant amplitude variable duty cycle input to a variable DC output A 3526 IC regulator with emitter followers performs duty cycle control and drives the transformer T3 that switches the power FETs The IC contains a sawtooth oscillator pulse steering logic and a comparator The error voltage on pin 1 varies from 0 5V to 3 5V to change the output duty cycle The power transformer has snubber networks to limit voltage spikes Power supply control uses an op amp within the 3526 to amplify the difference between a feedback fraction of the DC output and a reference voltage ECON The CPU generates the reference and the reference scales as the square root of the front panel power setting There is a DC current limit implemented with a comparator and pulse stretcher The pulse Force 2 Service Manual RF Outpu
18. to the mode selected It calculates and generates the required power supply control voltage It also calculates and sets the current limit for the RF output stage The main control element on the CPU board is an 89C54 a single chip microcontroller with 16k of on board electronically programmable read only memory EPROM The firmware residing within the 89C54 implements the performance requirements of the Monopolar Control Display board This section provides a description of the Monopolar Control Display board hardware An Intersil ICM7218C display multiplexer U8 performs the major display functions of the Monopolar Control Display board The device is a universal eight digit LED driver system It contains all the circuitry necessary to interface a microcontroller to a multiple seven segment LED display e 8x 8 static memory array with storage for the displayed information e Seven segment decoders All multiplex scan circuitry Thehigh power digit and segment drivers Mode Indicators The ICM7218C is not capable of driving the mode indicators with enough power to make them fully visible through the translucent display windows The microcontroller writes a bit pattern on the ICM7218C digit drive bus the pattern corresponds to the mode displays to be illuminated Segment H the decimal point drive output of the ICM7218C gates each of the eight digit drive lines through U28 and U29 to provide external multiplexing for th
19. 00 080 J6 Force 2 2 PCH only 0 Q jumper 234 300 080 J7 Force 2 8 PCH only 0 Q jumper 234 300 080 Capacitors C13 34 100 pF 5 100V 204 200 452 C2 4 9 11 15 18 19 21 23 25 27 JA uF x 20 50V 204 200 460 28 35 36 39 43 45 47 50 51 58 61 66 71 77 80 82 84 C7 16 17 37 38 44 52 53 55 57 1 LF 20 50V 204 200 464 62 65 C54 59 033 pF 10 100V 204 200 503 C60 47 pF 5 100V 204 200 533 C1 3 8 10 22 uF 20 25V 204 600 063 C20 26 32 33 81 10 pF 20 25V 204 600 067 C14 01 uF x 10 100V 204 200 457 C64 0022 HF 20 6KV 204 025 044 C74 1500 pF 5 500V 204 300 350 C49 2200 pF 5 500V 204 300 354 C29 470 pF 5 500V 204 106 027 C22 12000 pF 5 500V 204 300 130 C6 15000 pF 5 500V 204 300 132 C76 1200 pF 5 500V 204 300 348 Force 2 Service Manual Power Supply RF Board Valleylab Reference Designator Description Part Number C72 2 10 400V 204 400 001 C73 1 LF 10 250V 204 400 138 C30 31 15 HF 10 200V 204 400 150 C63 75 1000 HF 20 200V 204 500 103 C46 48 0015 pF 10 1KV 204 079 059 C12 1000 pF 10 100V 204 200 454 C5 2700 pF 5 500V 204 105 036 Integrated Circuits U8 LM306 210 016 002 U17 LM 324N 210 022 000 U10 12 14 18 4066 210 200 022 U13 4001B 210 210 001 U7 4011B 210 210 011 U9 15 LM339AN 210 300 015 U20 3526 210 300 062 U5 74F10 210 520 090 U11 7415126 210 520 091 U6 19 1427 210 800 012 U1 4 4429 210 800 014
20. 00 1000 1200 1400 1600 1800 2000 Impedance ohms Force 2 Service Manual SUOREDIIID9dS eoiuu2a Output Power vs Impedance Graphs Figure 4 3 PCH Generator Typical Output Power vs Load Monopolar Coag Modes Output Power watts Output Power watts 120 100 o a 140 120 100 80 60 40 20 Goag Generator Power Setting 120 W 60 W 0 200 400 600 800 1000 1200 1400 1600 1800 2000 Impedance ohms Low Voltage Coag Generator Power Setting 99 W 55 W 0 200 400 600 800 1000 1200 1400 1600 1800 2000 Impedance ohms 4 8 Force 2 Service Manual Output Power vs Impedance Graphs Figure 4 4 PCH Generator Typical Output Power vs Load Bipolar Mode Bipolar measurements are made using bipolar forceps on the insulating surface referred to in IEC 601 2 2 Figure 104 Bipolar 25 Generator Power Setting 8 cu a 2 5 70 W 35 W LE ee Eos olet s 15W 0 400 800 1200 1600 2000 2400 2800 3200 3600 4000 Impedance ohms Force 2 Service Manual SUOREDIIID9dS eoruu28 Notes Force 2 Service Manual Circuit Descriptions Bipolar Display The Bipolar Display board is the numeric display for the mode s power set point and the signals for these indicators derive from the
21. 022 D2 3 4 9 10 11 HDSP7501 239 750 119 D5 6 8 HLMP2755 239 750 033 D7 13 HLMP2855 239 750 039 D12 HLMP2655 239 750 042 Miscellaneous Y1 Oscillator 8 192 MHz 250 010 025 L1 2 EMI Ferrite Bead 251 100 106 DS1 DS2 RF Indicator 12 Vdc 215 200 077 201 302 001 Valleylab Reference Designator Description Part Number LP1 RF Indicator 12 Vdc 215 200 077 LS1 Speaker Assembly 8 Q 202 701 765 1 2W D1 2 HDSP7501 239 750 119 Force 2 Service Manual Interface Board Interface Board Reference Designator Description 201 304 002 Valleylab Part Number Resistors R1 4 6 8 9 12 14 18 19 29 32 39 58 59 61 R2 R3 R7 R5 43 45 56 R73 R10 13 20 28 33 63 R42 48 52 R60 62 R21 41 53 68 R40 R22 54 76 R31 35 64 75 R30 R65 74 R11 R26 34 71 R55 57 R72 R77 R38 R37 1k Q 5 1 4W 10 x 5 1 4W 4 3k Q x 5 1 4W 3k Q x 596 1 4W 5 1k Q x 596 1 4W 11k Q x 1 1 8W 3 6k x 596 1 4W 820 Q x 5 1 4W 2 4k 5 1 4W 10k Q x 5 1 4W 3 3k Q 5 1 4W 100k Q 5 1 4W 15k Q x 5 1 4W 6 04 Q x 1 1 8W 5 6k Q 5 1 4W 20k Q trimpot 10k Q x 1 1 8W 470k x 5 1 4W 51 1k Q 1 1 8W 220 Q x 5 1 4W 27 Q 5 1 4W 24k 5 1 4W 234 024 063 234 024 015 234 024 078 234 024 074 234 024 080 234 201 389 234 024 076 234 024 061 234 024 072 234 024 087 234 024 075 234 024 111
22. 120 Vac The line frequency may vary between 45 and 65 Hz Current Idle 0 7 max Power Idle 60W max Cut 7 0A max Cut 600W max Coag 2 9A max Coag 250W max Bipolar 2 6A max Bipolar 220W max Force 2 8 PCH Generator Maximum Operating Range 170 270 Vac Nominal Operating Range 220 240 Vac The line frequency may vary between 45 and 65 Hz Current Idle 0 4A max Power Idle 60W max Cut 2 9A max Cut 500W max Coag 1 5A max Coag 250W max Bipolar 1 3A max Bipolar 220W max Force 2 2 PCH Generator Between 85 and 135 volts input output power into nominal load will vary no more than 15 or 5 watts whichever is greater Force 2 8 PCH Generator Between 170 and 270 volts input output power into nominal load will vary no more than 15 or 5 watts whichever is greater Force 2 Service Manual su01 291 199d9 EJIUUDO High Frequency Risk Parameters High Frequency Risk Parameters Bipolar RF leakage current 150 mA per IEC 601 2 2 Monopolar RF leakage current 150 mA per IEC 601 2 2 Low Frequency Leakage 50 60 Hz Force 2 2 PCH Generator All patient connected terminals tied together Source current normal polarity intact chassis ground Source current normal polarity ground open Source current reverse polarity ground open Sink current 135V applied all inputs Chassis source current ground open Force 2 8 PCH Generator 10 pA lt 25 pA lt 25 pA 150
23. 2 W 330 mA and low voltage coag at 30 W is approximately 32 W 330 mA Adjust R76 and R101 as needed Set coag power setting display to 120 W and verify output power for approximately 112 W 610 mA Ensure that R72 COAG ICON is adjusted fully clockwise 7 Bipolar Output Calibration a b Attach a 100 ohm load to the generator output Set R73 to mid setting Turn R69 fully clockwise Set the bipolar power setting display at 70 W and adjust R73 for 70 W 836 mA output Turn R69 counterclockwise until it affects bipolar output in part 7b Then turn R69 clockwise one turn Force 2 Service Manual Sajnp300Jd SJUBUAIUIEJN Calibration Procedure gt Important Use short leads on all connections Adjust R61 R62 or R63 if any reading exceeds 150 mA in the cut blend or coag modes respectively If you need to make an adjustment recheck the High 8 High Impedance Power a Attach a 4000 ohm load between the ACCESSORY and PATIENT receptacles Activate cut at maximum power setting and adjust R61 to achieve approximately 35 W 93 mA Verify the 3000 ohm output is above 170 W 238 mA Attach a 4000 ohm load between the ACCESSORY and PATIENT receptacles Activate blend 2 at maximum power setting and adjust R62 to obtain approximately 36 W 95 mA Verify the 3000 ohm output is above 120 W 190 mA Attach a 4000 ohm load between the ACCESSORY and PATIENT receptacles Activate coag at maximum powe
24. 20 Resistor Assembly F2 PCH 207 500 198 Force 2 Service Manual 8 13 ISI Sued 99196 Generator Base Assembly Generator Base Assembly 202 701 448 Valleylab Reference Designator Description Part Number REM Adapter 202 701 063 Monopolar Keyboard 207 500 147 Bipolar Keyboard 207 500 148 8 14 Force 2 Service Manual Warranty Valleylab warrants each product manufactured by it to be free from defects in material and workmanship under normal use and service for the period s set forth below Valleylab s obligation under this warranty is limited to the repair or replacement at its sole option of any product or part thereof which has been returned to it or its Distributor within the applicable time period shown below after delivery of the product to the original purchaser and which examination discloses to Valleylab s satisfaction that the product is defective This warranty does not apply to any product or part thereof which has been repaired or altered outside Valleylab s factory in a way so as in Valleylab s judgment to affect its stability or reliability or which has been subjected to misuse neglect or accident The warranty periods for Valleylab s products are as follows Electrosurgical Generators One Year from date of shipment Mounting Fixtures all models One Year from date of shipment Footswitches all models One Year from date of shipment Patient Return Electrodes Shelf life only as stated on packag
25. 33 Fax 03 3764 0744 Auto Suture Company Canada 4490 Garand Street Ville St Laurent Quebec CANADA H4R 2A2 Ph 514 334 7602 Fax 514 331 5983 Force 2 Service Manual Table of Gontents Conventions Used in this Guide iii Valleylab Service Centers List of Figures viii Section 1 Service Warnings and Cautions Section 2 Unpacking and Installation Unpacking the Force 2 Generator 2 1 Responsibility of the Manufacturer 2 1 Preparing the Generator for Use 2 2 Power Requirements 2 2 Check the Power Connector 2 2 Ensure Proper Grounding 2 3 Perform a System Check 2 3 Section 3 Description of Controls Indicators and Receptacles Controls 3 3 Indicators 3 4 Alarms 3 5 Receptacles 3 5 Rear Panel Functions 3 6 Section 4 Technical Specifications Standard Conditions of Measurement 4 1 Operating Parameters 4 1 Storage and Shipping 4 1 Output Waveform 4 2 PCH Generator Output Characteristics 4 2 Output Gonfiguration 4 2 Input Power Source 4 3 Force 2 2 PCH Generator 4 3 Force 2 8 PCH Generator 4 3 Line Regulation 4 3 Force 2 2 PCH Generator 4 3 Force 2 8 PCH Generator 4 3 High Frequency Risk Parameters 4 4 Force 2 Service Manual Low Frequency Leakage 50 60 Hz 4 4 Force 2 2 PCH Generator 4 4 Force 2 8 PCH Generator per VDE 0750 IEC601 1 Section 19 for Class 1 Equipment 4 4 REM Contact Quality Monitor 4 5 Audio Volume 4 5 Approximate Weight 4 5 Size 4 5 Classification 4 5 Type
26. 339AN 210 300 015 U3 4013B 210 027 001 U2 79LO5AC 210 300 071 U4 4011B 210 210 011 011 4066 210 200 022 05 LM358AN 210 300 013 Transistors Q6 7 VN10KM 239 200 012 Q1 3 5 2N3904 239 015 000 02 2N2907A 239 100 012 Diodes CR1 3 5 8 11 13 15 1N4148 239 014 000 CR2 6 7 16 1N5240B 239 600 001 CR12 1N5233B 239 600 000 Optoisolators OPT1 6 OPI1264C 239 750 019 OPT7 9 4N35 239 750 002 Miscellaneous T3 Transformer RF Input 251 200 078 T1 2 IsoBloc Toroid 251 300 019 Force 2 Service Manual 8 7 ISI Sued 99196 Power Supply RF Board Valleylab Reference Designator Description Part Number K1 2 Reed Relay 10kV 230 007 007 K3 Double Pole Relay 230 012 000 Power Supply RF Board 8 PCH 202 701 918 2 PCH 202 701 917 Valleylab Reference Designator Description Part Number Resistors R12 47 5 1 2W 234 014 115 R42 82kQ x 5 1 2W 234 014 120 R43 120k 5 1 2W 234 014 124 R16 3 90 5 1 4W 234 024 005 R86 100 5 1 4W 234 024 015 R1 2 4 5 7 11 125 22 Q x 596 1 4W 234 024 023 R120 36 x 5 1 4W 234 024 028 R109 110 10 x 5 1 2W 234 014 068 R134 138 139 141 510 5 1 4W 234 024 032 R81 360 Q 5 1 4W 234 024 052 R118 560 Q 5 1 4W 234 024 057 R20 23 27 30 32 41 46 48 49 79 1k Q x 596 1 4W 234 024 063 96 108 114 127 135 137 140 R26 R83 R126 1 5k Q x 595 1 4W 234 024 067 R21 1 8k Q 5 1 4W 234 024 069 R3 22 95 107 2k x 5 1 4W 234 024 070 R17 29 60 80 84
27. 34 024 068 234 024 099 234 014 086 234 024 039 234 024 114 234 024 079 234 014 083 234 024 141 236 200 091 234 024 096 234 024 094 234 100 171 204 600 067 204 200 460 204 200 464 204 200 454 204 200 450 204 200 451 Force 2 Service Manual Monopolar Control Display Board Valleylab Reference Designator Description Part Number C7 11 100 pF 5 100V 204 200 454 C20 68 UF 20 20V 204 600 068 C26 0 033 pF 20 50V 204 200 459 C34 38 39 43 44 0 01 uF 20 50V 204 200 456 Integrated Circuits U4 9 7415374 210 520 374 U2 15 17 7415240 210 520 240 U3 89054 Programmed 210 730 211 05 27 2803A 210 800 002 U6 7415165 210 520 165 U7 10 74LS85 210520 085 U8 ICM7218 210 700 001 U11 24 MC14584B 210212 106 U12 4068B 210 210 068 U13 30 4071B 210 210 071 U14 4011B 210 210 011 U16 4001B 210 210 001 U18 25 4013B 210 027 000 U19 21 DAC0832 210 750 001 U20 4066 210 200 022 U22 4073 210 210 073 U23 LM324N 210 022 000 U26 74HC161 210 230 017 U28 29 4081 210 210 081 U1 7415273 210 520 273 06 DS1833 5 210 760 026 Force 2 Service Manual ISI Sued 99196 Bipolar Display Board Bipolar Display Board Valleylab Reference Designator Description Part Number Transistors Q1 2N2907A 239 100 012 02 3 7 VN10KM FET 239 200 012 04 2N3904 239 015 000 Q5 MPS6651 239 300 039 Diodes CR1 6 8 1N4148 239 014 000 CR12 13 LM336 210 300 016 LED s D1 HLMP2720 239 750
28. An L in the hundreds digit of the coag power setting display indicates the low voltage coag mode selection Monopolar Indicator This indicator illuminates when you select the generator s monopolar footswitch for monopolar accessory activation Bipolar Indicator This indicator illuminates when you select the generator s monopolar footswitch control to activate the bipolar output Force 2 Service Manual Alarms Alarms M Receptacles ACCESSORY 24 HANDSWITCH MICROBIPOLAR Remote Indicator This indicator illuminates and the alarm tone sounds once when the power control feature activates When this indicator illuminates you can make power changes using the power control handswitching pencil REM Alarm Indicator This indicator illuminates when the REM Contact Quality Monitoring System senses that contact between the patient return electrode and the patient is not adequate The tone sounds twice when the generator first detects the condition The generator does not produce monopolar output power when this alarm condition exists The generator clears the alarm condition when the REM Contact Quality Monitoring System senses that the patient pad contact resistance is within the acceptance range Patient Return Electrode Receptacle This two pin receptacle accepts the patient return electrode connector you use in monopolar procedures The receptacle accepts bot
29. age 11 of 13 S 38 Monopolar Control Display board page 12 of 13 S 39 Monopolar Control Display board page 13 of 13 S 40 Force 2 Service Manual Notes X Force 2 Service Manual Service Warnings and Gautions Danger Explosion Hazard Do not install the Force 2 generator in the presence of flammable anesthetics gases liquids or objects For continued protection against fire hazard replace the fuse with those having the same type and rating as the original fuse Electric Shock Hazard Always unplug the generator before cleaning Electric Shock Hazard Do not connect a wet power cord assembly into the generator or into the wall outlet Electric Shock Hazard Disconnect the power before replacing parts Electric Shock Hazard Do not touch any exposed wiring or conductive surface while the generator is disassembled and energized Never wear a grounding strap when working on an energized generator Keep the handset electrode away from personnel Use the accessory holster to hold the handset safely Use the ACCESSORY output receptacle for connecting either a handswitch three pin or footswitch one pin accessory but not both at the same time Connecting more than one accessory to the ACCESSORY output receptacle activates both accessories simultaneously Electric Shock Hazard The power FETs and other components on the supply heatsink are at line potential Use extreme caution when probing this circuitry Take approp
30. aveforms at TP12 on PSRF Board Figure 6 7 1 Cut Bipolar 2 d nd 1 3 Blend 2 Hos nd 3 LV Coag 5 Coag Sajnp300Jd eoueuajureyy Clamp Waveform at TP11 on PSRF Board Clamp Waveform at TP11 on PSRF Board Figure 6 8 pe Open Circuit 120W Coag Sus i 100 000 us 0 4 a0 8 jo o 000 us a 20 0 us div 6 14 Force 2 Service Manual Components Replacement Guidelines Components Replacement Guidelines Follow these guidelines when installing and mounting components on circuit boards 1 10 11 12 13 14 Install all nonpolarized components so that the value tolerance and part number are visible Install polarized components correctly so that the positive symbol negative symbol or other polarization markings are visible Do not remove coatings beyond the point where the lead enters the component body For example use a soldering iron to remove coating on the leads Center the component body between bends except for miniature diodes where it is desirable to leave the cathode lead longer than the anode lead for identification Line up the leads where required with the mounting holes prior to installation Position lead mounted components so that the major axis of the component is parallel to any two of the three major planes sides of the unit Mechanically support any component having a weight in excess of 14 18 g 1 2 oz by means other than the l
31. designed to operate at 110 120 Vac nominal 50 60 Hz The Force 2 8 PCH Electrosurgical Generator is designed to operate at 220 240 Vac nominal 50 60 Hz Check the Power Connector The Force 2 generator is supplied with a hospital grade power cord and a three prong power connector If using the generator in an operating room with another type of receptacle International Only The Valleylab representative in your country will equip your generator with the proper power cord for your country Domestic Only The hospital is responsible for replacing the connector on the power cord The power connector meets all requirements for safe grounding Its purpose should not be defeated by using extension cords or three prong to two prong adapters Periodically check the power cord assembly for damaged insulation or connectors Always grasp cords by the connector Do not pull on the cord itself Force 2 Service Manual Ensure Proper Grounding Ensure Proper Grounding gt Important It is the user s responsibility to ensure that the electrical installation of the relevant room complies with local codes and regulatory requirements such as IEC and BSI To ensure patient safety the Force 2 generator must be properly grounded The ground wire in the power cord connects to the unit chassis and ensures that no dangerous currents flow from the cabinet in the event of internal electrical failure Do not use extension cords or three p
32. e for assistance Have the following information ready e Hospital clinic name customer number Telephone number e Department address City state and ZIP code e Model number e Serial number Description of problem e Type of repair to be done Attach a tag with this same information to the generator when shipping it for service Force 2 Service Manual 7 1 Returning the Force 2 Generator Returning the Force 2 Generator Package the generator in the original packaging container if available If the original packaging is not available use the following guidelines for packaging Remove and retain the footswitch e Use a packing container with double wall construction Place a plastic bag over the generator e Use nonabrasive packing material that will not damage the surface of the unit Use four crossed straps to secure the box Returning Circuit Boards and Other Subassemblies When packaging circuit boards or other subassemblies use the following guidelines Place each board or subassembly in an ESD Electrostatic Discharge bag or container Provide a separate packing container for each board or subassembly 1 2 Force 2 Service Manual Service Parts List Ordering Replacement Parts When ordering replacement parts for the generator include this information Model number located on the rear of the generator e Serial number located on the rear of the generator e Valleylab
33. e mode indicator information A ULN2803A U27 boosts the resultant mode indicator drive current 5 2 Force 2 Service Manual Monopolar Control Display REM and RMOTE Indicators The ICM7218C does not control the REM and RMOTE indicators Microcontroller port lines P12 and P16 buffered by U5B and USA drive the REM and RMOTE indicators directly Pull up resistors R45 and R47 ensure that the outputs of the open collector driver pull high when its inputs are low An additional circuit in parallel with the REM LED is transistor Q1 which turns on when the REM indicator illuminates This transistor shorts out the volume control potentiometer causing the alarm tone to sound at full volume Two digit drive lines and seven segment drive lines bused from the Monopolar Control Display board to the Bipolar Display board control the bipolar display seven segment digits Integrated circuit U11C configured as a single gate oscillator R22 and C26 serve as the principal frequency determining elements R23 and CR8 change the duty cycle of the oscillator and help to fine tune the final audio output Port lines of the 89C54 P10 and P11 control the audio enable and tone frequency respectively These two control lines activate an on off analog switch which gates the audio drive signal to the audio amplifier stage comprised of U5F and U5G A second analog switch when enabled increases the net capacitance of the audio oscillator timing elements
34. eads Properly insulate all component leads which are or could be forced into a shorting condition with another component lead or circuit Do not stress component leads between mounting pins Provide an adequate strain relief to prevent damage to the component and solder pins When installing components on circuit boards with the circuitry on the component side of the board insulate the metallic bodies of the components with sleeving Mount resistors rated at 2 W or less flush to the circuit board 0 0 0 15 cm 0 0 0 06 in clearance Mount resistors greater than 2 W 0 635 cm 0 15 cm 0 25 in 0 06 in from the surface of the board Radial lead capacitors if installation requires bending the lead the bend should be no closer to the body than 0 15 cm 0 06 in Mounting height should be 0 08 0 64 cm 0 032 0 25 in from the board surface to the potting material Soldered surfaces should be clean and free of contaminants that would result in poor soldering Control soldering temperature to prevent damage to components or circuitry Use no clean wire solder for general soldering on circuit boards Force 2 Service Manual 6 15 Sajnp300Jd SJUBUAIUIEJN Notes Force 2 Service Manual Manufacturer Service Returning the Equipment for Service Before you return the generator to Valleylab call the Valleylab Service Department for a Return Authorization Number or call your Valleylab representativ
35. er setting display and observe the peak positive voltage Adjust R19 on the Power Supply board so that the maximum peak voltage is 440 V 15 V Force 2 Service Manual Calibration Procedure 4 Adjust the Pure Cut Output Calibration a b Attach a 300 ohm load to the generator output Set cut power setting display at 300 W and adjust R74 for 300 W output Attach a 100 ohm load to the generator output Verify that cut output is 290 W 325 W If not adjust R70 for the correct output R70 is the cut ICON adjustment 5 Blend Modes Output Calibration a b Attach a 300 ohm load to the generator output Set the blend 2 power setting display at 200 W and adjust R75 for 200 W output R75 is the blend ECON adjustment Attach a 100 ohm load to the generator output Set the blend 1 power setting display at 250 W Verify that blend 1 output is 210 W 260 W If not adjust R71 for correct output R71 is the blend ICON adjustment 6 Coag Output Calibration a b Adjust R61 R62 R63 and R101 fully clockwise Attach a 300 ohm load to the generator output Set coag power setting display to 30 W activate and adjust R76 ECON for approximately 37 W 350 mA Press the READY and COAG POWER DOWN buttons at the same time to enter the low voltage coag mode set low voltage coag power setting display to 30 W and adjust R101 for approximately 32 W 830 mA Verify the output power for coag at 30 W is 3
36. h REM dual section and conventional patient return electrode connectors Monopolar Active Receptacle Accessory This receptacle has two output receptacles It accepts three pin handswitching active accessories or standard one pin accessories which you can activate with the monopolar footswitch You can activate the cut and coag modes at this receptacle If you connect the handswitching pencil to this output receptacle you can activate the pencil with the footswitch Use the ACCESSORY output receptacle for connecting either a handswitch three pin or footswitch one pin accessory but not both at the same time Connecting more than one accessory to the ACCESSORY output receptacle activates both accessories simultaneously Monopolar Active Receptacle Handswitch This receptacle accepts the three pin handswitching active accessories and the Valleylab power control pencil You can only activate the power output from this receptacle by using the handswitch mechanism No power is available through use of the footswitch You can activate the cut and coag modes at this receptacle Note that the power control pencil is only functional through this receptacle Microbipolar Active Receptacle This receptacle accepts three pin handswitching bipolar accessories You can also activate these accessories with the footswitch This receptacle also accepts two pin bipolar footswitching accessories Force 2 Service Manual so 224d999H pue
37. hematics Force 2 Service Manual vii List of Figures Figure 3 1 Figure 3 2 Figure 4 1 Figure 4 2 Figure 4 3 Figure 4 4 Figure 6 1 Figure 6 2 Figure 6 3 Figure 6 4 Figure 6 5 Figure 6 6 Figure 6 7 Figure 6 8 PCH Generator Front View 3 2 PCH Generator Rear View 3 2 PCH Generator Typical Output Power vs Load Monopolar Cut Modes 4 6 PCH Generator Typical Output Power vs Load Monopolar Cut Modes continued 4 7 PCH Generator Typical Output Power vs Load Monopolar Coag Modes 4 8 PCH Generator Typical Output Power vs Load Bipolar Mode 4 9 Pure Cut 300 Q Load Bipolar 100 Q Load 6 10 Blend 1 300 Load 6 10 Blend 2 300 Q Load 6 11 Blend 3 300 Q Load Low Voltage Coag 300 Q Load 6 11 Coag 300 Q Load 6 12 1 Cut Bipolar 2 Blend 1 3 Blend 2 4 Blend 3 LV Coag 5 Coag 6 13 1 Cut Bipolar 2 Blend 1 3 Blend 2 4 Blend 3 LV Coag 5 Coag 6 13 Open Circuit 120W Coag 6 14 Schematics Supplement Schematic 1 Schematic 2 Schematic 3 Schematic 4 Schematic 5 Schematic 6 Schematic 7 Schematic 8 Schematic 9 Schematic 10 Schematic 11 System interconnect diagram S 4 Component connector locations 5 Bipolar Display board S 6 Bipolar Display board 7 Heatsink assembly RF out S 8 Heatsink assembly clamp S 9 Heatsink assembly power supply 10 Heatsink assembly HVDC 8 11 Monopolar keyboard 12 Monopolar keyboard 12 Footswitch board 13 vi
38. ify that no reading exceeds 150 mA 6 Connect the 200 ohm load and an isolated RF milliammeter between the active accessory and ground 7 Attach a 30 pF capacitor between the PATIENT receptacle and ground Record readings at maximum settings in cut and coag only 8 Select the coag mode selected and repeat steps 1 through 5 Increments of 20 W will continue to 115 W only Verify that no reading exceeds 150 mA 9 If any readings exceeds 150 mA check the RF leakage calibration steps 11 and 12 in the calibration section and repeat the test Force 2 Service Manual Sajnp300Jd SJUBUAIUIEJN Typical Output Waveforms Typical Output Waveforms Figure 6 1 Cut 3000 Load Bipolar 100 Load ER CHR Ere OOOO OOOO 10 0000 us s 10 0000 us 2 00 usrzdiv Figure 6 2 Blend 1 300 Q Load 25 0000 us oQ0000 s 25 0000 us 5 00 us diw 6 10 Force 2 Service Manual Typical Output Waveforms Figure 6 3 Blend 2 300 Q Load Figure 6 4 Blend 3 300 Q Load Low Voltage Coag 300 Load 25 0000 us 25 0000 us 5 00 us diw oO GODDA 5 us div 25 0000 us 25 0000 us Force 2 Service Manual 6 11 S9Jnpa2oJd SJUEUAIUIEJN Typical Output Waveforms Figure 6 5 Coag 300 Q Load 12 0 us sdis 6 12 Force 2 Service Manual TT on Waveforms at TP12 on PSRF Board TT on W
39. ii Force 2 Service Manual Schematic 12 Schematic 13 Schematic 14 Schematic 15 Schematic 16 Schematic 17 Schematic 18 Schematic 19 Schematic 20 Schematic 21 Schematic 22 Schematic 23 Schematic 24 Schematic 25 Schematic 26 Schematic 27 Schematic 28 Schematic 29 Schematic 30 Schematic 31 Schematic 32 Schematic 33 Schematic 34 Schematic 35 Schematic 36 Schematic 37 Power Supply board layout page 1 of 2 8 15 Power Supply board layout page 2 of 2 8 16 Power Supply board page 1 of 6 S 17 Power Supply board page 2 of 6 S 18 Power Supply board page 3 of 6 S 19 Power Supply board page 4 of6 S 20 Power Supply board page 5 of 6 S 21 Power Supply board page 6 of 6 S 22 Interface board layout 8 23 Interface board page 1 of 3 S 24 Interface board page 2 of 3 8 25 Interface board page 3 of 3 S 26 Monopolar Control Display board layout S 27 Monopolar Control Display board page 1 of 13 Monopolar Control Display board page 2 of 13 Monopolar Control Display board page 3 of 13 Monopolar Control Display board page 4 of 13 Monopolar Control Display board page 5 of 13 Monopolar Control Display board page 6 of 13 Monopolar Control Display board page 7 of 13 Monopolar Control Display board page 8 of 13 Monopolar Control Display board page 9 of 13 28 29 30 31 32 33 34 35 36 Monopolar Control Display board page 10 of 13 S 37 Monopolar Control Display board p
40. in turns on 5 ohms 2 ohms Repeat above test setup not using a REM type connector Set the variable resistance to 5 ohms Note that the REM alarm is off Gradually increase resistance and record value at which the REM alarm turns on less than 24 ohms The REM alarm should remain off below this value and turn on again if above this value Force 2 Service Manual 6 7 S9Jnpa2oJd SJUBUAIUIEJN Line Frequency 50 60 Hz Current Leakage Test Procedure Line Frequency 50 60 Hz Current Leakage Test Procedure gt Important When you activate the generator it is difficult to make a 50 60 Hz leakage measurement because of the extreme difference in magnitude of the 50 60 Hz leakage current in the RF signals When you activate the generator there can be as much as 7000 V peak to peak of RF compared to 20 mV of 50 60 Hz This ratio 110 db of voltages would require the use of sophisticated measuring techniques In practice the 50 60 Hz leakage currents do not change significantly when you activate the generator This test measures potentially dangerous 50 60 Hz leakage currents The Force 2 generator is left on but not active To indirectly measure the current observe the voltage across a 1k ohm resistor to ground from each front panel receptacle 0 015 pF capacitor connects in series with the 10k ohm resistor to remove any trace of oscillator high frequency noise inside the generator This capacitor has little effect
41. ing Sterile Disposables Sterility only as stated on packaging This warranty is in lieu of all other warranties express or implied including without limitation the warranties of merchantability and fitness for a particular purpose and of all other obligations or liabilities on the part of Valleylab Valleylab neither assumes nor authorizes any other person to assume for it any other liability in connection with the sale or use of any of Valleylab s products Notwithstanding any other provision herein or in any other document or communication Valleylab s liability with respect to this agreement and products sold hereunder shall be limited to the aggregate purchase price for the goods sold by Valleylab to customer There are no warranties which extend beyond the terms hereof Valleylab disclaims any liability hereunder or elsewhere in connection with the sale of this product for indirect or consequential damages Force 2 Service Manual 1 This warranty and the rights and obligations hereunder shall be construed under and governed by the laws of the State of Colorado USA The sole forum for resolving disputes arising under or relating in any way to this warranty is the District Court for the County of Boulder State of Colorado Valleylab its dealers and representatives reserve the right to make changes in equipment built and or sold by them at any time without incurring any obligation to make the same or similar changes on eq
42. ing the generator work at a static control workstation Wear a grounding strap when handling electrostatic sensitive components Handle the circuit boards by their nonconductive edges Use an antistatic container for transport of electrostatic sensitive components and circuit boards When testing follow proper testing procedures in order to duplicate manufacturer test data Keep test leads as short as possible Lead inductance and stray capacitance can affect meter readings adversely Use of uncompensated scope probes may cause large errors in measurements When measuring microampere leakage currents accidental capacitive or inductive coupling may cause order of magnitude error in the observed values Perform the leakage current and ground resistance tests before returning the generator to clinical use 6 2 Force 2 Service Manual Recommended Test Equipment Recommended Test Equipment Power Up Self Test You will need the following equipment to perform the checks and calibration described in this section If you use substitute equipment it must meet or exceed the specifications of the recommended equipment Tektronix type 465 Oscilloscope or equivalent with 50 MHz or greater band width e Tektronix type P6015A High Voltage Probe Tektronix type P6009 100X Probe Simpson Model 1339 RMS RF Ammeter 0 250 mA e Wattmeter 0 500 W 300 ohm load and 100 ohm load with reactive phase angle of less than 20 degrees at 500 KHz
43. ive circuitry giving a stable RF output frequency During RF T on and T off drive generation U26 divides the crystal frequency from 8 192 MHz to 510 KHz One half of U18 serves as a toggle flip flop to divide the clock further to 255 KHz Two analog gates of U20 controlled by the microcontroller port P15 select the frequency of the RF drive pulse trains The microcontroller loads 74L5165 parallel in serial out shift U6 with a pattern that corresponds to the grouping of RF drive pulses for the desired mode of activation Since the 8 bit shift register cyclically loads itself while data shifts out the drive frequency of modulation is 255 8 31 88 KHz An AND gate U22 processes the selected clock frequency with the serial output of the shift register U6 to produce the RF on drive This generator does not use RFT1 the RF off drive R36 C41 compensate for timing skews on the clock generation circuitry and provide a means for adjusting the RF output power To avoid RF interference problems the microprocessor goes into an idle mode when the generator is activated A latch U18A sets when the generator is activated and resets when the activation ends The Q output of this latch goes to an interrupt input Port 33 of the microcontroller Resetting this latch awakens the microcontroller from its idle mode state allowing it to respond to the change in the activation status The occurrence of a REM alarm except when Bipolar mode is ac
44. llator protected Drip Proof per IEC 601 1 The Force 2 generator enclosure will prevent reasonable amounts of falling liquid from interfering with the generator s safe and satisfactory operation monopolar output measurements are made using the setup referred to in IEC 601 22 Figure 104 Force 2 Service Manual su01 291 199d9 EJIUUJ9 Output Power vs Impedance Graphs Output Power vs Impedance Graphs monopolar output measurements are made using the setup referred to in IEC 601 22 Figure 104 Figure 4 1 PCH Generator Typical Output Power Pure Cut 360 vs Load Monopolar Cut Modes Generator 320 Power Setting 280 g 240 W 200 n 160 a 120 150 W 80 40 0 0 200 400 600 800 1000 1200 1400 1600 1800 2000 Impedance ohms Blend 1 Generator Power Setting B 250 W o amp 125 W amp 5 O 200 400 600 800 1000 1200 1400 1600 1800 2000 Impedance ohms 4 6 Force 2 Service Manual Output Power vs Impedance Graphs Figure 4 2 PCH Generator Typical Output Power vs Load Monopolar Cut Modes continued Output Power watts Output Power watts Generator Power Setting 200 W 100W 200 400 600 800 1000 1200 1400 1600 1800 2000 Impedance ohms Blend 3 Generator Power Setting 200 400 600 8
45. nly one peripheral at a time all external memory locations have addresses with all bits high except one The address latch U9 is continuously active with addresses on the address data bus latched with every negative transition of ALE When it accesses an external device it qualifies the latched address byte with a RDN or WMA signal as appropriate causing the selected device to be strobed with a negative true read or write signal Three of the external memory locations are read only and five are write only Previously the text described one of the write only locations U8 the ICM7218C display controller The following text covers the other seven locations starting with the read locations Three Read Only Locations The three read locations enter the 22 user inputs Fourteen are the keyboard inputs Eight are decoded activation inputs The signals are grouped logically into activation inputs mode selection and power UP DOWN control Tri state inverting buffers U2 U15 and U17 gate these signals onto the CPU data bus Four Write Only Locations There are two 8 bit digital analog converters DACs on the data bus U21 and U19 These are write only devices The U21 DAC generates the power supply control voltage ECON The U19 DAC generates the RF current limit analog voltage ICON The buffered outputs of the two DACS are further amplified by a gain of 2 4 The final output range of the two analog signals is approximately 0V to 5V
46. on the 50 60 Hz leakage current To calculate the leakage current use the formula I E R where 1k ohms and E is the voltage across the resistor The maximum acceptable voltage across the 1k ohm resistor for 10 leakage is 0 010 V 10m V Input Circuit 0 015 uF 10k ohms 1000 ohms Measure third wire leakage current by opening the green grounding wire at the plug and connecting the 1k ohm resistor from chassis to ground The maximum voltage across the 1k ohm resistor for 350 pA leakage would be 350mV You may use commercially available leakage testers for this test The typical value of 50 pA is valid for manufacturer installed 3 m 1 0 mm 2 line cords Do not use longer line cords or extension cords They increase the third wire leakage With the Force 2 generator power off the third wire leakage should be less than 10 pA The line frequency sink leakage is the current that passes into the PATIENT leads when there is a 120 V 50 60 Hz potential between a PATIENT lead and the chassis The voltage source should be a 120 V isolation transformer with a 120k ohm current limiting resistor in series with a secondary To calculate the current measure the voltage across a 1k ohm resistor in series with the AC volt source and the PATIENT or active receptacles This current should be less than 10 pA Force 2 Service Manual Bipolar and Monopolar Output RF Leakage Test Procedures Bipolar and Monopolar Output RF Leakage Tes
47. ormation call 1 800 255 8522 1 303 530 2300 2004 Valleylab All rights reserved Made in USA Printed in USA Force 2 Service Manual Gonventions Used in this Guide gt Important Indicates an operating tip or maintenance suggestion Br gt gt Indicates a potentially hazardous situation which if not avoided could result in death or serious injury Indicates a hazardous situation which if not avoided may result in minor or moderate injury Notice Indicates hazard which may result in product damage Controls indicators and receptacles on the unit appear in bold capital letters like this PURE CUT ATTENTION Refer to the accompanying documents Type CF equipment Low Leakage Suitable for cardiac use Defibrillator proof Drip Proof CAUTION To reduce the risk of electric shock do not remove cover Refer servicing to qualified service personnel The generator is high frequency isolated per IEC 601 2 2 DANGER Explosion Hazard Do not use in the presence of flammable anaesthetics Force 2 Service Manual Valleylab Service Centers Valleylab Boulder Colorado 80301 3299 USA Ph 303 530 2300 Toll Free 800 255 8522 Tyco Healthcare Nederland B V Technical Service Center De Beverspijken 37 5221 EE s Hertogenbosch THE NETHERLANDS Ph 073 6312412 Fax 073 6314540 Auto Suture France S A 2 rue Denis Diderot La Clef de Saint Pierre 78990 Elancourt FRANCE Ph 33 0
48. pA 100 pA per VDE 0750 IEC601 1 Section 19 for Class 1 Equipment Measured with radio frequency output inactive Type CF Normal Single Fault Current Path Condition Condition Earth Leakage Current 0 5 mA 1 0 mA Enclosure Leakage Current 0 01 mA 0 5 mA Patient Leakage Current 0 01 mA 0 05 mA Patient Leakage Current mains on the applied part 0 01 mA 0 05 mA Patient Auxiliary Current 0 01 mA 0 05 mA 4 4 Force 2 Service Manual REM Contact Quality Monitor REM Gontact Quality Monitor Audio Volume Approximate Weight Size Glassification Measurement Frequency 140 kHz 20 kHz Measurement Current 3 0 mA maximum Acceptable Resistance Single area pad nominally 24 ohms Ranges Dual area REM nominal range 5 135 ohms If impedance measured is outside the acceptance range a REM alarm will occur In the REM mode if resistance increases by more than 40 above the reference value or above 135 ohms an alarm will be generated The mode indicator tones are adjustable from 45 to 65 dBA at 1 meter The alarm tones are set to a level of gt 65 dBA at 1 meter and are not adjustable 10 kg 22 Ibs 20 x 33 53 8x 13 x 21 in Type CF Equipment per IEC 601 1 The Force 2 generator provides a high degree of protection against electrical shock particularly regarding allowable leakage current and has a CF type isolated floating applied part The applied part may be used on the heart Defibri
49. part number components must be replaced with parts of identical construction and value Replacement part ratings and tolerances must be equal or better than original Generator performance can be adversely affected by substitution of lower grade parts All items referenced in this section are found in the Schematics Supplement Force 2 Service Manual 8 1 Monopolar Control Display Board Monopolar Control Display Board Reference Designator Description 201 496 000 Valleylab Part Number Resistors R24 27 39 44 R2 8 22 R5 21 31 34 R7 R9 46 48 R1 3 4 6 10 13 14 25 26 45 47 R11 R12 R14 R15 18 R19 R23 R20 29 49 R32 33 37 41 R35 43 R36 R40 R42 RA1 4 Capacitors C1 3 C5 6 10 12 13 15 18 19 21 24 27 28 30 33 35 36 40 45 46 48 51 C4 8 17 29 42 C2 16 25 C9 C14 41 10k Q x 5 1 4W 100k Q 5 1 4W 1k Q 5 1 4W 51 x 5 1W 330 Q 5 1 4W 3 3kQ 5 1 4W 750 Q 5 1 4W 1 6k 5 1 4W 33k 5 1 4W 75 Q x 596 1 2W 100 Q x 5 1 4W 130k Q 5 1 4W 4 1K Q x 5 1 4W 51 x 5 1 2W 1 8M 5 1 4W 10k Q 10 SW Trimpot 24k 5 1 4W 20k 5 1 4W 10k Q resistor array 10 uF 20 25V 0 1 uF 20 50V 1 pF 20 50V 1000 pF 10 100V 22 pF 5 100V 33 pF 5 100V 234 024 087 234 024 111 234 024 063 234 204 112 234 024 051 234 024 075 234 024 060 2
50. r setting and adjust R63 until power increases from approximately 20 W 70 mA to 58 W 120 mA Discontinue activation and adjust R63 1 4 turn counterclockwise Activate the generator and observe output reading Continue this inactivated activated calibration in 1 4 turn increments until the output is approximately 20 W 26 W 70 mA 80 mA Verify the 3000 ohm output is above 60 W 141 mA 9 High Frequency Leakage Bipolar RF Leakage a Connect the 200 ohm load and RMS voltmeter in series from the right MICROBIPOLAR receptacle to chassis ground Impedance power b Connect a 30 pF capacitor between the left MICROBIPOLAR receptacle and chassis ground c Activate MICROBIPOLAR at 70 W and note the results for the right MICROBIPOLAR receptacle d Reverse the load and capacitor connections at the MICROBIPOLAR receptacles e Activate MICROBIPOLAR at 70 W and note the results for the left MICROBIPOLAR receptacle 6 6 Force 2 Service Manual REM Test Procedure gt Important Use short leads on all connections Record readings at maximum power settings in cut and coag REM Test Procedure Monopolar Patient Return RF Leakage Connect the 200 ohm load and RMS voltmeter in series from PATIENT receptacle to chassis ground connect a 30 pF capacitor between active accessory and chassis ground a Activate cut at 15 W and note leakage current Increment the setting by 5 W until 25 W is reached and ensure that the hot spot
51. riate precautions such as use of isolated tools and equipment use of the one hand rule etc when taking measurements or troubleshooting the generator Force 2 Service Manual This generator contains electrostatic sensitive components When repairing the generator work at a static control workstation Wear a grounding strap when handling electrostatic sensitive components Handle the circuit boards by their nonconductive edges Use an aniistatic container for transport of electrostatic sensitive components and circuit boards Electric Shock Hazard Special caution should be used when working on the exposed Power Supply board as the heatsinks and many of the components are floating at potentially harmful voltage potentials Use the footswitching ACCESSORY receptacle for generator output on the Force 2 8 PCH and Force 2 2 PCH generators 1 2 Force 2 Service Manual Unpacking and Installation Unpacking the Force 2 Generator Notify Valleylab to arrange for repair or replacement of any parts damaged from shipping All returns must have approval from the Valleylab Customer Service Department The return authorization number must be displayed on the package label Refer to Section 7 Manufacturer Service for further information Carefully remove the Force 2 generator from the shipping package Save the carton and packing materials to use when transporting the generator or when returning it for service If you have any q
52. rong or two prong electrical adapters Undesirable leakage currents are affected by the polarization of the 50 60 Hz input power It is the responsibility of the user to ensure proper polarity and grounding of the power outlets supplying power to the unit If required use the equipotential ground cable supplied with the generator The equipotential ground connector is located on the rear panel of the generator Perform a System Check Before placing the Force 2 generator into clinical use perform a system check as described in Section 6 Power Up Self Test Force 2 Service Manual uoneieisu pue Guryoedun Notes 2 4 Force 2 Service Manual Description of Gontrols Indicators and Receptacles This section describes the controls indicators and receptacles for accessories located on the front panel of the Force 2 generator Force 2 Service Manual 3 1 Figure 3 1 PCH Generator Front View 9885 A in us e la JE 4 a J A MONO poan FOOTSWITCH SELECTOR Falleylab 6 Figure 3 2 PCH Generator Rear View MONOPOLAR FOOTSWITCH ZIZI Z A BIPOLAR FOOTSWITCH w FOREIGN EQUIVALENTS AND 250V F8 0A 110 120 U S PATENTS 4416276 4416277 250V F6 3A 220 240 4632109 4658819 4658820 4827927 WARNING RISK OF FIRE REPLACE FUSE AS MARKED
53. s each with its own transformer winding for power This generator has three possible RF output receptacles Single pole normally open high voltage relays make the selection of the receptacle The CPU turns on the relays through bipolar drivers on the Interface board ACPU controlled delay between relay closure and initiation of RF drive reduces contact wear Note the 0 0047 pF capacitors in series with the RF output and return These are the primary patient protection against electrocution and must be high voltage parts The REM circuitry measures the pad to pad resistance of dual pad patient return electrodes or the wiring resistance of single pad electrodes A microswitch in the connector opens for dual pad patient return electrodes and selects one of two alarm signal paths in the alarm logic string The load on the REM transformer secondary is the measured resistance The secondary resonates by two 0 22 pF capacitors and a synchronous detector senses the reflected primary load Four clocked CMOS switches perform synchronous detection A potentiometer tunes the oscillator to the transformer The detector output amplifies and inputs to four comparators Two comparators provide hard wired alarm limits at 5 ohm and 135 ohm alarm limit for dual pad patient return electrodes The third comparator provides a hard wired alarm limit at 20 ohms for single pad electrodes The fourth comparator generates a pulse width modulated waveform by comparing the
54. t RF Output stretcher shuts down the supply s control IC for about 1 3 of a second and then soft starts the supply The R C network on the 3526 pin 7 provides a power on reset A separate switching power supply on the rear of the chassis supplies the low voltages It supplies regulated 5Vdc 12Vdc and 12Vdc to the Power Supply board where all voltages filter with 10 pF capacitors The 12Vdc voltage converts to 5Vdc using a LM336 regulator The supply voltages transfer to the Interface board and Monopolar Control Display board through the 40 pin ribbon cable The power FETs and other components on the supply heatsink are at line potential Use extreme caution when probing this circuitry This circuitry resides on the Power Supply board and amplifies the CPU signal T on RFT 0 to the level the front panel power setpoint requires T off RFT 1 is not a requirement and therefore terminates at the ribbon cable with a 10k ohm resistor Current limiting and peak voltage limiting circuits prevent damage under extreme load conditions Varying the supply voltage controls the power Both DC supply and RF current limit levels calibrate for each mode cut coag blend and bipolar The output tuning and transformer turns ratio is different for cut and coag waveforms and a relay performs the selection Eight power FETs act as RF switching elements Acurrent sampling resistor at the sources provides input to a current limit circuit Gate dri
55. t Procedures gt Important The following procedure is meantto Test Setup approximate the test procedure found in the IEC Standard 601 2 2 1 Sub Clause 19 101b In applications where you perform the IEC test do not use this procedure as a direct substitute Place the Force 2 generator on a wooden table with no exposed metal on the surface or within one meter of the table surface 2 When testing the Force 2 8 PCH generator use active accessory and activate it using the footswitch Bipolar Procedure 1 Set Microbipolar to 70 W Connect a 200 ohm load and the isolated RF milliammeter between the left MICROBIPOLAR receptacle and ground 2 Attach a 30 pF capacitor between the right MICROBIPOLAR receptacle and ground 3 Activate Microbipolar output and note results 4 Repeat process by attaching a meter to the right MICROBIPOLAR receptacle and attaching the 30 pF to the left MICROBIPOLAR receptacle No reading shall exceed 150 mA gt Important Use short leads Monopolar Procedure 1 Connect the 200 ohm load and an isolated RF milliammeter between PATIENT receptacle and ground 2 Attach a 30 pF capacitor between active accessory and ground 3 Activate the generator at 5 W in pure cut and note results 4 Increase settings at 10 W increments until you reach 35 W Verify that no reading exceeds 150 mA 5 Increase settings at 20 W increments until you reach 195 W Subsequently increase to maximum output Ver
56. tional information Cleaning Instructions Clean the Force 2 generator using standard hospital procedures Use a mild detergent and damp cloth to clean the cover control panel footswitch and cord Do not allow fluids to enter the chassis Do not use caustic corrosive or abrasive cleaning materials The generator and all components must be completely dry before use Do not sterilize the Force 2 generator Electric Shock Hazard Do not install a wet power cord assembly into the generator or into the wall outlet Force 2 Service Manual 6 1 General Testing Information General Testing Information ee gt Important When removing the Power Supply board please refer to Schematic 1 for proper hardware installation Use a star washer in the location indicated for grounding The Force 2 generator rating is not for continuous duty operation The recommended duty cycle is 50 15 seconds on 15 seconds off Maximum ON time at a power setting of 100 is two minutes Take appropriate precautions such as use of isolated tools and equipment use of the one hand rule etc when taking measurements or troubleshooting the generator Electric Shock Hazard Do not touch any exposed wiring or conductive surface while the generator is disassembled and energized Never wear a grounding strap when working on an energized generator Notice The generator contains electrostatic sensitive components When repair
57. tivated also resets the latch Enabling the generation of RF drive pulses requires the inverse of the signal that awakens the microcontroller RF EN WAKEUP Consequently RF drive trains and RF output can only occur when the microcontroller is in the idle state 7415374 latch UI buffers Port 2 of the 89C54 microcontroller Port 2 controls the RF enable and RF relay signals The latch has an asynchronous reset that forces the output signals to an inactive state during the power up reset period The Interface board mounts vertically at the front panel shield It contains the patient circuit module functions activation output receptacle selection and patient return contact quality monitoring This board has isolated high voltage patient connected circuitry and you must use exactly equivalent parts for component replacement The activation circuits comprise an isolated power source comparators to detect switch closure and optical couplers The power source is two flyback converters and toroid transformers The handswitch circuits use three comparators to sense active to cut active to coag cut to coag and active to cut to coag connections These codes for cut and coag increase power and reduce power respectively The remaining activation circuits Force 2 Service Manual Suolduosad 1119115 Power Supply Power Supply simply have resistors in series with the opto couplers to limit current There are four isolated circuit
58. tput power proceed directly to step 4 of the procedure Take special care in step 3 Calibrate the 100X probe and the oscilloscope together before using 1 Remove the cover from the Force 2 generator to expose the internal controls and test points 2 12 V Supply Connect the digital multimeter between pins 5 or 6 and pins 1 or 2 on the 40 pin interconnect cable The meter should read 12 V 0 3 V 5 V Supply Connect the digital multimeter between pins 3 or 4 and pins 1 or 2 on the 40 pin interconnect cable The meter should read 5 V 025 V 5 V Supply Connect the digital multimeter between pin 7 and pins 1 or 2 on the 40 pin interconnect cable The meter should read 4 75 V 0 2 V Special caution should be used when working on the exposed Power Supply board as the heatsinks and many of the components are floating at potentially harmful voltage potentials Use the footswitching ACCESSORY receptacle for generator output on the Force 2 8 PCH and Force 2 2 PCH generators 3 Adjust the High Voltage Clamp a Set the coag power setting display to 30 W b Attach a 300 ohm load from the generator output to the PATIENT receptacle c Activate the generator in coag Output power should be 30 W 5 W d Remove the 300 ohm load e Adjust the coag power setting display to 1 f Attach an oscilloscope with a 100X probe between the anode of CRI TP11 and ground Activate the generator in coag Slowly increase the coag pow
59. uestions concerning the contents contact Valleylab Customer Service at 1 800 255 8522 or your Valleylab representative Responsibility of the Manufacturer Valleylab is responsible for the safety reliability and performance of the equipment only within the limits of the warranty and other applicable laws if Installation procedures in this manual are followed Assembly operations extensions re adjustments modifications or repairs are carried out by persons authorized by Valleylab Theelectrical installation of the relevant room complies with local codes and regulatory requirements such as IEC and BSI Theequipment is used in accordance with the Valleylab instructions for use Force 2 Service Manual 2 1 Preparing the Generator for Use Preparing the Generator for Use Power Requirements The electrosurgical generator may be placed on a mounting cart available from Valleylab or any sturdy table or platform It is recommended that carts have conductive wheels Refer to hospital procedures or local codes for detailed information Provide at least four to six inches of space around the sides and top of the generator for convection cooling Under continuous use for extended periods of time it is normal for the top and rear panel to be warm Explosion Hazard Do not install the Force 2 generator in the presence of flammable anesthetics gases liquids or objects The Force 2 2 PCH Electrosurgical Generator is
60. uipment previously built and or sold by them A 2 Force 2 Service Manual
61. ve is direct at a 12V level The drains have diodes in series to allow the output transformer primary voltage to swing negative in coag The cut waveform drive is at a 50 duty cycle with a 1 ps ON time Turning on the FETs for 2 us every 32 us generates the coag drive waveform RF control uses a RS flip flop to control the T on pulse to the output stage The RS flip flop can be reset by feedback circuits to reduce output drive pulses for control of RF output Excessive output current compared to ICON or excessive negative going voltage compared to the ECON setting can generate this pulse reduction pulse wacking Comparing output transformer primary voltage to ECON controls the RF leakage and high impedance power The signal from the primary attenuates and then compares to a reference level proportional to the ECON setting This attenuation is mode specific for cut blend and coag When the negative going voltage from the primary exceeds the reference level this removes wacks the RF drive pulses and adds a resistive load in parallel to the primary to dampen the output waveform The CPU supplies the current limit reference ICON and varies as the square root of power with an offset at low powers When peak voltage limiting occurs the reference voltage to the LM306 current limit com parator reduces which in turn reduces the output pulse width At high Force 2 Service Manual 5 7 suondiose 1119119 RF Output load impedances

Force 2 Electrosurgical Generator

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