service information phyaction supporta
Contents
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3. 10 The Netherlands Uniphy International B V perty of Pro Beun by Drawn val Appro ts Layout Solder Side PCB 4922 componen oer Num 22 18 Page 4922LS ps 6 November 2000 Si Doc ument Jate
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5. Ei ei Dae T PER TS P ee ETE _ FMTY 0 1997 BY UNIPHY BV PCB4922 REFLOW SIDE s o m E ix CON601 col MT720 2 en J702 MT 730 2 4 S 2 CONSO1 8601 R602 R03 lo 0602 d 6 L d OH 8 8 E CONZOL 192 127 gt N am CON202 cm R 5 e 8 x in MT740 E o 228 710 R511 UL MARK 8 6227 Ror 1205 A L206 B 18 8 02041 0295 2 13 a ENS s N S H 158 N amp 1118 TR301 HE E Q ho A P 0506 04 1 3 8 329 Sa CECI TP301 2040 S 9 ale 403 PS E Iraq and 52 gt RY302 RY401 LS RERE 3 s 2 401 3 m ZN 8 5 m KE E bes U402 0404 EIE M z RY3 3 RY301 m STETSTSIS J403 Ci lt 8 3 9 MADE ING o J401 TP409 rpg TP408 J101 HOLLAND TTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTI 0 1 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 X 2 3 4
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7. GROUND WITHI CONDUCTIVE P NONCONDUCT Iv N THE APPLIED ARTS OF CABINET PARTS OF CABINET PART ARE POTEN NG ERS CARRY O 5V MAX Property of UNIPHY B V The Netherlands Drawn by N H Beun Approval Title 490 ISOLATION DIAGRAM Size Document Number B 4900150 5 Date March 5 1997 Sheet moveo CONSOLE 5387654321 7654321 TERT CON601 CON806 POAG 56 15 1 7654 3 2 1 CONSO1 PCB492 150 SIMUL J401 JP2013 SMB HDR2 JP2015 W2015 3MM CON901 PCB493 NOTICE JP801 CAN BE PLUGGED INTO CON101 CONNECTING THE BATTERY ACROSS AND VB IN THIS WAY THE BOARD IS POWERED BYPASSING SW801 AND THE SUPPLY SELECTOR CIRCUIT 000 N QUI S020 OPERATE m m V TP409 D TP408 g g Ao COLOR CODE TIMER STOP FOR SERVICE swso1 2 25Ain 4 8X0 8 F101 CON10O1 T4AL SERVICE FORCE 5V J101 H BT80O1 12V 1 7Ah NiCad BLACK BROWN Property of UNIPHY B V The Netherlands DBANGE Drawn by N H Beun YELLOW Approval CREEN S Aa tle PURPLE 490 WIRING DIAGRAM GRAY Number REV WHITE SS SCH 2 Daty Marsh 1997 4 of CONSOLE INTERFFACE USV USI USset US SD USmod UStest REFCLK RSTOUTN
8. C 1 5 22 c 18 dE 12 52 Al2N VREFB R128 512 13 26 A13 N L TEMPsns 5 19 20 3E 412 A14 y RFBB 19 L 2 aE VBsns _ 533 ances 21_ 22 KM62256CL 55 20 REF2VS 2 R129 c120 um 1 L 53k6 501 WR AGND L 1 100N Ne KTY82 AD7528 L Nt 110 4 1 TLC7528 L 32 ADCA 26 75 L F PB 14 TUE dd L ADCO 13 F 3 ADC1 PO 12 505555 1 ADG2 24 D301 3 RY301C ZN BAS AZ830 ET SD So P3 0 PO 9 i H 22 P2 1 R508 R506 DUMMY Pi F ET AME P22 Bove 4_AD6 Bese 2 4 L 70 I 3 ADS N 1 L SRY OFF 70 P2 8 5 0302 4 2 2 9 4 TADS Z Bas AZ830 F 4 P2 10 PO 3 05202 1 4 TESTO P2 11 PO 2 9 ADI is P2 12 1 99 1 H 2 224 P2 13 28 Abo N DEENERGIZE ET NUL 2 86 P3 6 Teal 1 gt L ETerror P3 15 0501 0207 RY201C 1N L go P3 14 80 166 2 po aNeas 82 P3 3 1 8102 Q2 5 2 4 i303 Q3 USHD 1 s 5 13 05 EM 1 L 18105 de D303 4 Rv303c 1910246 ZN BAS 2830 L WR 32L 1 11 6 L RD 1 ET ONLY 74HCTO2 US OFF RD S CLR GND L R210 ABE TPIC6B273 L 6 5 07 82 p3 2 6 TOOK L r 5Vmc 5 5Vmc L R502 z USIDout P3 8 RXD USIDin 89 p3 9 TXD TOK H 7 56 P3 12 4 7 ADC7 5 L R429 USquard 58 7 REF4V1 e ADCS 4 H 100E BSL EN
9. E 7 rg ETSET 22 0 OOK LMC6482 10N 1 1 1 1 1 R304 R307 C309 F 3 TK ToN al ss esL 5Vet R337 E 1 BO 8222 4 519410 F L 2 R336 L lt U303A 18k2 4 MAX474 1 I L R308 2 4 1 r 9305 L Wa 5 8 856 E N R310 1 3 L F AMF MAX 2 r R3o2 R347 100K 100K 1 296 gt 1 Te IN SETHE CON301A L 5Vet 5Vet 5Vet 6410 L PERIOD O 0 PULSE L305 L 22 45 lt 204 5 80 R340 TENS narum R341 820K 1 00 8 1 _ 23 2 1 1 CONTROL dud 6 Rx cx H54 1 ISAFETY 2 L amp IRELAY DEENERGIZE ET ONLY 14 T 22 474 ep 19 Lea22 PATIENT CIRCUIT 13 E 78 L 5 L 5546 D308 C323 4 100N 1 7 5Vet O Kp d 74HCT123 74HCT123 22K BAS R335 C321 32L 2KO5 220P 3 1 Si9925 R327 1 519926 51KO 1 TENS PULSE 5Vet ETV 9 R344 R318 R328 c316 L LIMITER 1koo 075 100K gt 1 4 1 2 1 S IP3025 2 93905A 8325 74 N OUTPUT STAGE L Property of UNIPHY The Netherlands r 74HCTO8 Drawn by N H Beun r 9 Approval 9 U307A Location L TC4W66F Title L 490 ELECTRO THERAPY CURRENT GENERATOR F Size Document Number REV 4900ETG SCH 2 3 v Date April 4 1997 Sheet 12 of 22 i 5 3 4 5 6 7 8 9 11 1
10. H 5V TA NMI c518 E POT430A 1N Redo 254 ADC9 RSTIN gt RSTOUT L 22K 68 SCL 8 2 6 es Sct 8 2 7 L US NULN 87 84 BLINK L P3 7 p3 4 84 pag ET LED L 5 LCD7 LCDCC 65 pa Boson LCD6 LCDRS 36 52 2 K L NUL reba LEDE 3251 5 21 15 46 MTX2 2 1 4 1 14 EE NN Property of UNIPHY B V The Netherlands le LLCD3 P1 25 2 sv BONN P y L LCD2 32 P1 2 P1 12 L501 0510 6501 1502 esos esos _ Drawn by Beun F 9 peni ay P1 1 10U 10U Approval 9 300 1 11 43 Keys d 16V 1 eee 51259 FA YT 71 37 p 7 Bie Title L LCDIO 7 P1 8 5Vme 490 MICROCONTROLLER CORE BL ENA C517 Size Document Number REV REMEMBER TO JUMPER J101 WHEN USING BOOTSTRAP MODE Too Troon B Si Date March 5 1997 Sheet 9 of 22 7 2 3 2 5 6 7 8 9 TO 11 12 13 xX 14 FB a 111111111410 Q 5Vmx O H MTX O 3 LA 1 7 r ET NUL R6014 2 2 2 2 2 2 R606 r 100K 1 1 1 BLINK R601B 6 4 o L 1 10 0605 MIX2 2 15 1 BC856 2K2 Q603 Q604 9602 L R332 7
11. Lene yaaa 17 5 2 Replacing the battery pack sss 17 5 3 Exchanging the 17 5 4 Replacing the main board 492 17 5 5 Exchanging the membrane panel or connector block 18 CHAPTER 6 CIRCUIT DIAGRAMIS 19 Table of contents Service information Phyaction Supporta CHAPTER 1 GENERAL INFORMATION 1 1 introduction The Phyaction Supporta is suitable for administering electrotherapy and ultrasound therapy as well as for a combination of both types of therapy There is one 2 pole medium frequency interferential current that can be applied There are also two TENS currents TENS continuous and TENS burst The ultrasound therapy can be applied with a 4 cm or 1 cm optional ultrasound head It is possible to use ultrasound therapy in combination with the interferential current or TENS continuous For detailed information about the features and operation of the device we suggest that you should read the user manual 1 2 Safety test To ensure the patient s safety a safety test has to take place every time after the equipment has been serviced The Phyaction Supporta is a class BF appliance Carry out the safety test with a safety tester that complies with the IEC 601 1 demands See section 3 2 for further details 1 GENERAL INFORMATION Serv
12. R411 R416 c402 R418 419 15 7 12k1 100K L 4K64 100K 1 1 100N 5Vad L SENSE AMPLIFIER 1 2 SERVICE OPERATE 9 L L P438 R427 Raed TEST LEVEL 0 37V 6 TOOK 10K 5 180 1 TEST LEVEL 2 8V AZ830 L LMCS062A 10KO RIR m 5 5 1 120 2 50 120 33K L 5 100 2 8 E P R432 H R426 100P 27 Q401 L CURRENT BSS138 L 1 1 L L 15 3125v H R422 10mA 2080 L s lt 4 3 33mA 0694V R433 C406 TP403 O 10 50 100 L 47K ENABLE F Ton ETI POTMETER 74HCT132 L 04058 5VadO aie 2 Property of UNIPHY B V The Netherlands MR Qi3 Drawn by N H Beun RIOT 74 574060 Approval 9 T I ME AF s CK 22 74HCT132 SERVICE Location 492 0405 Title L 4 490 ELECTRO THERAPY SAFETY CIRCUIT F TP409 TP408 Size Document Number REV F 3 v 55 4900SAFE SCH 2 3 1997 Sheet 13 of 22 i 5 3 4 5 6 7 8 9 TO 13 14 FB TB 1 0 a ON OFF 1 CHARGER SUPPLY SELECTOR 5V SMPS SWITCH P 0106 L CON101D 18 1V MTBSOPO3HDL 5 6 4 d CON101E gt f C123 L104 C124 9101 R101 5566 L s 2X2 7mH 100N BCs56 9 POWER ON 63V 4A 250V 63V 0 25wW a rcd E BOOTSTRAP uo E 5
13. USerrorN gt IS V K D O RSTOUT ET NUL 4900USG SCH ET CURRENT GENERATOR 4900CIF SCH eons 4900ETG SCH ET SAFETY CIRCUIT 70246V R133 5V 150E ETI ETref REF 4V1 REF2V5 POWER SUPPLY ET NULN TESTO 7 TEST1 TEST2 ETerror SRY ON 8 SRY OFF 4900PSU SCH 4900UCC SCH 4900SAFE SCH Property of UNIPHY B V The Netherlands Drawn by Approval Location PC Y Title Document Number REV 10 Date March 5 1997 Sheet 5 of 19 4 6 x secon W2015 CON803p4 CONO ENCLOSURE 4MM SAFETY CREEPAGE ALL CIRCUITS TO CHASSIS 777 IS MORE THEN 4 mm CHASSIS EP Property of UNIPHY B V The Netherlands Drawn by Approval MUTUAL CLEARANCE ALL OTHER CIRCUITS Location Y Title IS 1 mm OR MORE 490 OUTPUT FILTER Document Number B 10 ae SCH Date March 1997 Bheet 6 st ET AND OUT TRACES RATED FOR 100mArms KEY GRID HSMY C670 HSMG C670 HP 6 Property of UNIPHY B V THE NETHERLANDS Drawn by Nico Beun Approval oc i Location 490001 Title HIS aeo MEMBRANE KEYBOARD Size Document Number REV LED GRID Date March 5 1997 Sheet 7 of 1 2 3 4 5 6 7 8 9 10 X CUP 1 1 I 1 1 1 1 COAX DB 502 DS2502 SMALE CONTACT SPRING 130 C 401 120 Vw 60 Hz f 4 9 W 1 25 PRIMARY SECONDARY CIRCUIT CIRCUIT 1
14. checks proper functioning of the safety relay and circuits and is activated every time the unit is switched on The tests are performed by the microprocessor and last for approximately 3 seconds Both intensity regulators should be in the zero position i e maximum counter clock wise This is checked at the start of the selftest If an intensity regulator is not at zero an error will be reported by graphic symbols prompting to turn ET intensity to O and or turn US intensity to 0 and an error shutdown procedure will be initiated as described below The safety relay driver circuitry is accessible to the microprocessor for 3 seconds after power up of the unit After this period the microprocessor will not be able to switch the safety relay on any more The control lines used for test purpose are only accessible by the microprocessor if the ET intensity regulator is in the zero position as an extra precaution against hard or software errors 4 TROUBLE SHOOTING Service information Phyaction Supporta Page 10 4 2 2 ERROR shutdown procedure The safety circuit will switch off the safety relay immediately in the event of an error thus disconnecting the drive signals from terminals to avoid hazards to the patient In addition to this the uC will if it detects an error either from the safety circuit or otherwise call an error function Error which will perform the following actions All interrupts are disabled ET Dac to zero no signal to the
15. intensity knob the LCD and the LEDs The power supply circuit selects the power source a battery or a mains supply and also converts this voltage to 5 Volts The device can be switched on with a switch at the back The electrotherapy circuit consists of a switch mode power supply a generator the intensity knob and the safety circuit The ultrasound circuit consists of a switch mode power supply a generator and a head identification circuit The serial service interface is used for extended service features 2 THEORY OF OPERATION Service information Phyaction Supporta Page 2 2 2 1 The microcontroller core The microcontroller used in the Phyaction Supporta is an 80C166 The 80C166 is a 16 bit RISC controller with the following features on the chip 1k byte RAM memory 5 timer counters 10 channel 10 bit AD converter 76 general 1 0 lines 2 UART for serial data transfer e g RS232 watchdog timer capture compare system Besides the microcontroller the following parts are present in the core 32 kByte RAM data memory 1 Mbit EPROM program and constant data memory 512 byte E PROM non volatile data memory HCMOS IC s for decoding and buffering purposes a power on reset circuit 2 2 2 The User Interface 2 2 2 1 The switch panel and LEDs The switch panel is a matrix of 14 metal dome membrane keys a matrix of 20 LEDs and two single LEDs The matrices of the keys and the LEDs are connected t
16. match is established ultrasonic output power is restored to the set ultrasonic power 2 2 5 7 Ultrasound head The ultrasound head converts the electric signal into ultrasonic vibrations The transducer with a diameter depending on the head size is glued in an aluminium cup that minimises electromagnetic radiation and enables the transducer to be used on the operating frequencies The aluminium cup can also be used as a second electrode for combination therapy A separate electrode needs to be connected to the safety socket for combination therapy An OTP in the connector of the head enables the uC to detect whether a head is connected and to recognise the type of head that is connected This OTP also contains specific head related information Thus enabling the uC to set the head specific frequencies and ultrasonic power 2 2 5 8 Head Identification Circuit The head identification circuit enables the uC to read the contents of the OTP in the connector of the ultrasound head If the checksum calculated by the differs from the checksum in the OTP the head will not be recognised If a head parameter necessary for the ultrasound circuit to generate the ultrasound power exceeds its limits the uC will produce an error message 2 THEORY OF OPERATION Service information Phyaction Supporta Page 7 CHAPTER 3 PERFORMANCE CHECK 3 1 Safety inspection This inspection is for technical maintenance purposes only It is recommended that this
17. to be supplied to the output stage The switch signals to the uC that the operator has put the control into operation 2 2 5 2 PLL The required ultrasound frequency of 0 7 MHz to 1 0 MHz is generated by a phase locked loop PLL The PLL transforms the low frequent signal Refclk generated by the uC up to the required drive frequency which is twice the ultrasound frequency The modulator divides this frequency by two and mixes it with the desired duty cycle If the PLL is out of lock the Lock error signal USerror is used to stop the modulator in order to prevent erroneous frequencies produced by the treatment head 2 2 5 3 The modulator To obtain a symmetrical drive signal for the power stage the modulator switches its outputs with half the input frequency Synchronously the modulator mixes the duty cycle signal with the ultrasound frequency With the Lock error signal the modulator can be forced to shutdown if the PLL is out of lock 2 2 5 4 The switch mode power supply SMPS The SMPS supplies the output stage with a voltage between V and 5 V The SMPS for the ultrasound circuit is only active if the ultrasound therapy is chosen The uC de activates the SMPS via a shut down US SDyV The SMPS output voltage is linear proportional to its input voltage Usset Thus the wC can change the ultrasonic power by setting Usset proportional to the square root of the desired output power The continuously monitors the output vol
18. 10 Ultrasound generator test After the device is switched on the ultrasound generator is initialized to generate no output The dutycycle is set off and the US head frequency is set at 700 kHz 1 Intensity regulator should be at zero This is checked by means of the potentiometer switch if it is not at zero errUSPOT O 2 US errorline should be inactive The US errorline is read if it is active an 320 10 enrLINE1 is given 3 Check output O As the intensity is set a no output should be given Therefore the voltage on the USI line should be smaller than 0 2V If not 310 10 enrVUSIO is given Also the voltage on the USV line should be smaller than O 2V else 310 11 enrVUS2 is given 4 Check the PLL guard The US head frequency is set at O kHz The PLL should now detect an out of lock condition and the US errorline should become active If it does not become active 320 10 enrLINE1 5 The US head frequency is set at 700 kHz If the US errorline remains active 320 30 enrLINE3 4 TROUBLE SHOOTING Service information Phyaction Supporta Page 14 4 3 ERROR code summary message value description 100 00 Internal processor 10 External RAM 20 External ROM 30 External EEPROM 10 hardware error line active 20 05 hardware error line active O0 Potmeter not at O at start of test 10 05 supply 40 relay 12 150 comparator 10 JET limit comparator 10 Ultrasound frequenc
19. 2 will be given Check the ET errorline The safety relay is switched off An open circuit should exist else 420 30 enrETSAFETY3 The ET errorline should have become active If it hasn t 420 31 enrSAFETY4 will be given If these tests have passed the safety and dummy relay are functioning and the de energize relay has disconnected the sockets In the next test the safety relay is tested under full load conditions 1 Check the ET errorline The output is set to O mA The safety relay is set to on The ET errorline should remain inactive else 420 32 enrRELSAFETY5 is given Test if the safety relay switches under full load The DAC s are programmed for an output current of 12596 maximum operating current The safety limit check circuits should activate the ET error line causing the safety relay to open If the ET errorline is not activated 420 33 enrSAFETY6 is generated Test if the safety relay contacts open If the above test passes but a closed circuit is detected ET power supply voltage below 2 5 V 420 34 enrRELSAFETY7 is generated This test completes the verification of the safety relay 4 2 7 safety limit check In this test sequence the 15096 comparator circuits are tested The safety relay is energised and a closed output circuit is created by switching on the dummy relay 1 2 ET testline TESTY2 is activated this changes the reference voltage of the 15096 comparator If the ET error line is n
20. 2 13 x T 4 ters ti FB lp lp L401 L auum 25254 L 5 REF 4 1 INTENSITY CONTROL COMPARATORS L Q 6 4 096 L TOON 5K11 5K11 64 L 1 1 1 E 5 242492 5 NONE lt 4 1 R406 0408 i TEST LIMIT COMPARATOR U404D 5 11 5Vad ZNLM4040 2 L TEST RA S 1 U22952 22 5 Bae TEST 150 COMPARATOR U404C E 7762272 FORCE 125 OF ET SET MAXIMUM 2 CONTROL sel 1 U404B 2 1 0 FORCE 8 OF ET SET MAXIMUM 5V 5Vad L u402 To 4 1 1 TEST REFERENCE AMP U403A U404B L 3 ats R407 GUARD L 5K11 5 1 1 O TEST POTMETER U404A L 4 1 2 usoga ERROR 1 1 1 NONE B L 5 OVER 1 VOLTAGE L 3 2 GUARD 74 4051 R414 9 94046 e 5 1 R415 2 3 10KO 150 1 SAFETY RELAY POT410A 1 0 ET NUL are Lo 5 20 t 1 TLC374 RADIIS WITH LATCH r 1 I L ee aE ES L i R412 ZZ 409A 04040 7 B NUL 100K 150 4 LMC6062A 4 L 2439 R441 9 SIMUL INIT 1 1 2h 1 00 1MOO O 5Vad is Raoa U403B 2 5 0405 gt TLC2272 74HCT132 H 64K9
21. 20V gt 200mA 100 240 V 4 50 63 Hz 55 100 240 gt 18V 1 8A 230V gt 200mA 404 B 8 130 C 230 V Property of UNIPHY B V The Netherlands 10 X 27mA 50 Hz Drawn Beun Approval Title Pi as0 Acconpanvane EQUIPMENT _ Size Document Number REV 5 55 2222 ee Date March 5 1997 Sheet 8 of 22 1 2 3 4 5 6 7 8 9 10 X FB 112111111113 A tg 5 5 5 5 5 5 L U504 ADO 11 Ao 19 USO7A R120 R505 ADI 12164 A1 y A16 21 vob C506 L 100K 3 9 10K AD2 13 8 A2 N 5 u5o6 7 8 3 5Vmc AD3 15 02 2 f BY Pre 17 L _7 JJ p S DBO VDD H TSTLED Z4 P2 15 v v 18 AD4 16154 aq S44 _N b DB1 L EXTPSU 22 14 C C C C C vec 05 5 JJ 082 VREFA F 67 C C C C C511 AD6 18 1 5V SD P2 5 ae ADS 18106 DB3 A 1 54 H 07 7 be 084 F REF4V1 nana AREF Sap 25 DBS 2 ag 24 49 N 086 OUTA F VB R501 C505 x501 WR 27 WE A10 H21 A10 N DB7 L 1 100N 55 Taw 1 SMH 11 23 A11
22. 4HCT132 BC856 BC856 BC856 L 100K 35 MTX3 4 3 L C345 220 L L 3 2 407 74HCTO2 16 5 O 74HCT27 2 2 2 D603 0604 D601 D602 2 R605 R333 K K 4 K 4 4 KE L 620E L 74HCT27 BAS BAS BAS BAS LC2 55 L 100K 32L 32L 32L 32L bet 51 L LC4 20 LC3 19 ETLED 18 17 F 3 BATLED BAILED 16 3 BATLED 15 r KEY2 KR2 13 EY3 L LI 4 11 2 K Q R602G 1 Kes 10 L 1 1860316 9 C601 604 C602 2t 15 KRI 8 L 1N 1N 1N 1N 3 14 LR2 4 T 4O53 6 4 5 L 5 E LR3 2 L 6 11 LR6 j 7 10 CRS 5 L 9 7 L 150E F AMP487576 L L601 L zum L 5 5V 5Vmx 5 10U L C607 C608 F 74HCT123 10U 16 es AD O 7 EIL r 45Vet CON701 JP701 4 2p L 5267 5264 L U301B J702 702 8 LMC6482 LCD3 14 14 7 D7 t LCD2 13 guy 13 D6 7 LCD 12 4 5 12 ps 7 LCDO 11 g11 pa TIS t Hau 7 Heal MOD701 br 6 E R711 8 8 1 Took LCD g 8 H 5 lt LCD4 LCDE 6 c 16x1 12 F LCDS LCDRW 5 5 74HCT L RW 4HCT123 F SE m LCDRS 4 BOOST 2 Property of UNIPHY B V The Netherlands 5297 osc Drawn by N H Beun E OON 6 Approval 9 3 Location 492 Title L 257 87022 ICL7660S 490 CONSOLE INTERFACE H a Size Document Number REV B 4900CIF SCH 2 2 Date March 5 1997 Sheet 10 of 22 i 2 3 4 5 6 7 8 9 TO 11 12 13 x 14
23. 5 EXCHANGING BOARDS AND MODULES Service information Phyaction Supporta Page 18 CHAPTER 6 CIRCUIT DIAGRAMS Index of the circuit diagrams Sheet Sheet Sheet Sheet Sheet Sheet Sheet Sheet Sheet 10 Sheet 11 Sheet 12 Sheet 13 Sheet 14 Sheet 16 Sheet 17 Sheet 18 Sheet 19a Sheet 19b Sheet 19c Sheet 19d Sheet 20 Sheet 21 Sheet 22 CO OO J O O 0 N Block diagram Isolation diagram Wiring diagram Main PCB Output filter Membrane keyboard foil Accompanying equipment Microcontroller core Console interface Ultrasound RF generator Electrotherapy current generator Electrotherapy safety circuit Power supply Connector definition Components reflow side PCB 4922 Component solder side PCB 4922 Copper layout reflow side PCB 4922 Copper layout layer 1 PCB 4922 Copper layout layer 2 PCB 4922 Copper layout solder side PCB 4922 Layout PCB 4930 Component index Label cross reference 9 pages 2 pages 5 EXCHANGING BOARDS AND MODULES Service information Phyaction Supporta Page 19 Vb SUPPLY CONTROLLED 18V 1 8A SMPS 4 TRICKLE CHARGER 200mA EXT PSU DETECTOR C 2 i ELECTRODES 2 1 1724 C i 1 i 0 I 1 i ER 6 gt 0 i 1 3 1 B ET PHA _ET PHB lt ln TE
24. 566 105 L 9102 R121 D113 R122 L TIP3O 100K 100 L 32L m3 FORCE 5v 20 F 3K01 R134 L 1 9 L 0 25 9101 L 3 R102 9111 797 3 0119 BC856 F 1K 407 L D102 SZ BAS D105 25V 14 CON101A F101 12Vnom 32L PRLL BAS L E 4 4001 32L F T4AL250V r BATTERY L 2 a 5566 D101 D104 r ZN BAS PRLL MTBSOPO3HDL L CON101H 170mA 32L 4001 L T L 1 2 C125 L105 C126 R111 L TOON sss 2X2 2mH 100N 105K 5 4 2A 250V 63V 1 R110 F BATLED 6 3KO1 6 R108 R107 R118 R135 IB 2k2 42 2 154 1M L 1 1 L 114 L 4 274K lt Sv sp 1 BATLED 7 BATsns gt 7 men L TP101 100K 1 100N U103C LM339 F 9 R104 L T cmt 14 TSTLED gt 8 TSTLED 4 dios 11 8 E rSn BC846 m 13 ExrPsuy F 103 1119 R112 R116 105K 105 105 EMSs 5 6111 1 1 Property of UNIPHY The Netherlands r E iu Yoke FOR TESTING PURPOSES POWER APPLIED Drawn by Noth Bean o AT PIN 6 AND PIN 2 OF CON101 Approval L THIS IS ALSO ACHIEVED BY PLUGGING IN THE Location 492 CHARGE INDICATOR BATTERY PACK DIRECTLY ON CON101 Title WARNING THIS WILL ALSO SHORT CIRCUIT L PIN 5 TO SW TO PIN 1 BAT SO BEWARE 490 SUPPLY OF CONNECTING ANY OTHER POWER SUPPLY Size Document Number REVI B 4900PSU SCH 2 3 v Date Ma 6 1997 Shee
25. ET SMPS US Dac to zero no signal to the US SMPS ET SMPS is switched off ET testlines are switched to inactive state ET output drive signals are switched off ET PHA ET PHB ET Safety relay is switched off the patient circuit disconnected This is a latched state that can only be exited by switching off the unit Dummy relay is switched on The output is short circuited De energize relay is switched on The US testline will be switched to inactive The US SMPS is switched off The US dutycycle is switched off An error message Err an error number and a value is displayed on the LCD display Wait in an endless loop In the endless loop the state of the power supply is observed If only a battery is connected and the power supply voltage drops to the deep discharge voltage 10 V the microprocessor will also shut down the 5V SMPS For processor kernel errors processor RAM or EPROM the processor will display the error message for 5 seconds and then shut down the 5V SMPS 4 2 3 General test description The microprocessor circuits are tested first followed by the ET and finally the US circuits In case the unit does not complete this selftest and no error message is displayed and the internal wiring is connected properly the following items are suspect Supplies mains and other Microprocessor Program EPROM Address data or control lines 4 2 4 Microprocessor test Any fault found will stop the selftes
26. GH 3 As there should not be any ET output generated the ETV signal should be very low If it is higher than 0 1V 410 10 enrETV 4 As there is ET output the signal also should be very low If it is higher than O 1V 410 20 enrETI 4 2 6 ET Relay test In the following test sequence the safety standby and dummy relays are tested for proper functioning All tests are executed with the de energize relay active the output circuit is disconnected from a possibly connected patient If the de energize relay is not open and a patient is connected an error will be given during this part of the selftest It is not tested any further if it remains open no current will reach the patient The DAC is programmed in such a way that with a test reference voltage applied via the TEST Y3 line approximately 4 mA DC will flow through the output circuit if connected either through an external connection or the dummy relay The voltage level of the ET power supply is proportional to the resistance in the output patient circuit with a given current This level is used to test the output circuit resistance When checking for an open circuit a voltage on this point below O 5V is recognised as an error Conversely a voltage above 0 1 V while testing for a closed circuit is recognised as error When the safety relay is energised the contacts in both channels are closed The dummy relay will short circuit the output channels energised The initial
27. SERVICE INFORMATION PHYACTION SUPPORTA Copyright Uniphy BV 1997 1997 Phyaction is a registered trademark of Uniphy BV Art Code 93004950 1 Phyaction is manufactured in The Netherlands by Uniphy BV P O Box 558 NL 5600 AN Eindhoven the Netherlands Tel 31 499 491802 Fax 31 499 474734 Table of contents CHAPTER GENERAL INFORMATION 1 1 1 Introduction o ated hid setae E 1 1 2 Safety uku Seu DL MI 1 CHAPTER 2 THEORY OF 2 2 1 Introduction Sau aa ed apa a e NE eae enue eee 2 2 2 General block diagram 2 CHAPTER 3 PERFORMANCE 8 3 1 Safety INSPECTION SE e besa eae 8 3 2 IEG 601 1 safety tests onem en ee ae 9 CHAPTER 4 TROUBLE 10 4 1 lrnitroduction ccc etos ee us 10 4 2 Description of the automatic selftest sees 10 4 3 List of error messages coerente RASA RN ERR NE ERR ers 15 4 4 Adjustment procedures u u in eden ete tates MUN Ren Nee es DID UP REIS 16 4 5 Jumper Settings mene ennemi nennen 16 CHAPTER 5 EXCHANGING BOARDS AND MODULES 17 5 1 Introduction
28. ST SELECTOR YV V V V V SRY ON SRY OFF SRY STBY ETerror Vb USset CONTROLLED lo 3 lo 1 m lo zl lo n lo 3 D lo 3 lo 3 N x 9 2 1 US HEAD CONTRAST USHDtype USIDout USIDin SOC 166 CONTROLLER TEMPsns ADC USguard TEMPERATURE y 8 Property of UNIPHY B V The Netherlands SENSOR Drawn by N H Beun k_usrer 4 91 pproval pes US NUL ont 490 BLOCK DIAGRAM Size Document Number REV c 4900BLK SHT 2 ONLY ONE OF THE UNITS BELOW CAN BE CONNECTED AT ONE TIME CON806 5 801 i I gt ELECTRODES gt e e 5 e 2 U U I oO ac mm LJ 1 u ul UJ i 1 v gt cE OO 1 I POWER SUPPLY i RY3O1 i R901 DEENFRGIZE 2 SkV OFENFRGIZE _ _ _ _ _ J 2 RY302 c901 ET ONLY 220222222 ene RY303 _ USHDtype CONSO BY US HEAD TRICKLE TT CHARGER YYYY Z lt T MATCH i I MAINS APPLIED m PLUG LH LAN lt gt C data l PART es SURFACE OF US HEAD LEGEND METAL SHA S OF IS GROUND OF A P SYMBOLISES THE CABINET POTEN ERS
29. Serror WHEN UStest IS HIGH ACTIVE L Q 0205 74HCT4046A 7 REFCLK 85234 3 7 R222 14 COMP CLK U208A REFCLK SIGN 5 2 6 56K INH p 22n 2 pe1 R227 neo 4 L 13 v C 1 1 L 220 15 252 x x R 74HCT132 MicroLAN INTERFACE 1N PC36 1 2 1 2 DEM 100K F 74HCT132 L R236 S 6 7 1 7 c224 0 5Vul L 8 100N USIDin R234 CON201 C223 2E 2 L 120P R225 R226 1 US ID f D205 R223 49k9 75 L WY BAS32L 47K 1 1 6410 TO CON2 224 F __ Property of UNIPHY B V The Netherlands r Drawn by N H Beun r 9 Approval 9 Location PCB 492 Title E 490 ULTRASOUND RF GENERATOR 74HCTO2 Size Document Number REV B 4900056 SCH 2 3 v Date April 4 1997 Sheet 11 of 22 1 2 3 4 5 6 7 8 9 10 11 12 13 44 21 aaa uasa aaa i tg L301 L302 L o a wm TET L M T CONTROLLED SMPS 2 SA 10U 3 C302 1U5 100 C303 L 9301 1 16 8342 4 514412 P 519410 L R312 3 li 0305 v W L 4 A REF 32k L 2 5 ETT 1M mE R343 c318 L C308 2313 470 407 100 5 syne 100N 16 1 CONTROL LX 0 1 67 2 5 R309 304 aaa een L TP301
30. The most frequent service operations will be the exchanging of boards or modules because it would be too time consuming and costly to do component level service in the field When exchanging boards or modules there are a few things that should be noticed These attention points will be described in this chapter If you want to exchange a module or a board you will have to open the appliance It is probably most convenient to place the appliance on its front side with the bottom side up Open the battery compartiment by removing the two Allen screws Disconnect and remove the battery Inside the battery compartment are three Phillips screws Unscrew the three screws and lift the bottom part off by tilting it slightly using the side of the handle as a pivot If you have exchanged a board or module always test all the functions of the appliance This functional test starts with switching the device on checking all the LED s and the LCD If no error messages appear check the output currents and the ultra sound heads After this you should run a safety test A short description is given in section 3 1 and 3 2 In general it is stressed that you should take the necessary precautions to prevent electrostatic discharges to the delicate electronic circuits of the unit These precautions implicate that you should ground the unit use a grounded desk overlay ground the tools such as solder irons and you should be connected to ground by the usual wrist or an
31. ain board Before removing the membrane panel flatcable first unlock the connector and carefully pull the flatcable out of the socket 5 EXCHANGING BOARDS AND MODULES Service information Phyaction Supporta Page 17 Unscrew the 5 Philips screws that tighten the main board to the front panel These screws are located one in each corner of the main board and one in the middle Now you can lift the main board from the front panel After replacing the main board place the 5 screws back and connect the output and power cables Carefully place the membrane flatcable in the connector and tighten the cable by locking the connector After closing the unit mount the two intensity knobs Perform a functional and safety test as described in section 5 1 5 5 Exchanging the membrane panel or connector block To exchange the membrane panel first open the appliance as described in section 5 1 and take the necessary precautions to prevent electrostatic discharges Remove the main board as described in section 5 3 Take out the four plastic rings before removing the membrane panel from the plastic front part Now you can pull the connector block from the carrier plate of the membrane panel To assemble the front slide the connector block firmly on the membrane panel Place the membrane panel on the plastic front part followed by the four plastic rings Replace the main board as described in section 5 4 and close the appliance as described in section 5 1
32. condition of these relays prior to test is safety relay off and dummy relay on 1 Test if the safety relay is off A low current approximately 4 mA is applied to the output circuit If a closed circuit is detected 420 10 enrRELSAFETY will occur 2 Test if the ET errorline becomes activated if the safety relay is switched on The output is set to testline TEST is disabled The ET safety relay is switched on If the errorline is activated it means that the safety circuit has activated it and 420 11 enrRELSAFETY 1 will occur 3 Test if the safety relay makes contact The testline TESTY3 is enabled a low current 4 mA is applied to the output circuit The ET errorline should still be inactive otherwise 420 40 enrETERROR will occur With the safety relay on and the dummy relay on a closed circuit should exist an open circuit will result in 420 12 enrRELSAFETY2 4 TROUBLE SHOOTING Service information Phyaction Supporta Page 12 Test for external patient connections The dummy relay is switched off The ET errorline should still be inactive otherwise 420 40 enrETERROR will occur The output circuit should be open again A closed circuit suggests an external load and will result in 420 20 enrRELDUMM Y Test if the dummy relay makes contact The dummy relay is energized The ET errorline should still be inactive otherwise 420 40 enrETERROR will occur The outputs should be shorted else 420 22 enrRELDUMMY
33. e to limit the power loss Because the losses in the FETs are very low no heat sink is needed A third FET is used exclusively for TENS generation operating as a gated current source 2 2 4 4 Switch mode power supply The SMPS supplies the output stage with a voltage between V and 5 V In case of MF current the control circuit regulates the voltage of the SMPS in such a way that the set current ETset flows independent of the patient resistance the patient resistance is too high the voltage will clip at 5V In case of TENS current the SMPS is set to maximum because the control circuit is too slow to follow the TENS pulses 2 2 4 5 Intensity control The electrotherapy intensity is set by a potentiometer with a switch The switch signals to the that the operator has put the control into operation The position of the sweeper of the potentiometer is a direct measure for the set value of the current The sweeper is the reference voltage ETref for the signal DAC Also it is used for comparison with the read value of the current by the safety circuit 2 2 4 6 Safety circuit In this circuit the primary output current is used to monitor whether the output exceeds the limit of 100 mApeak or 150 of the set value by the intensity control Also the intensity control is monitored for interruptions of the ground and guard terminal All the safety functions are achieved by comparators fully independent of the uC In case of a fault the com
34. full description of these tests we refer to the IEC 601 1 1988 for Class Il Type BF equipment Here is just a short reminder list of the tests and the test limits Measurements limits Insulation resistance applied part gt 2 0 MO Enclosure leakage current normal lt 100 uA Enclosure leakage current open lead lt 500 Enclosure leakage current reverse lt 100 uA Enclosure leakage current open lead lt 500 pA Patient leakage current normal lt 100 uA Patient leakage current open lead lt 500 uA Patient leakage current reverse lt 100 pA Patient leakage current open lead lt 500 uA Mains on applied part normal lt 5000 uA Mains on applied part reverse lt 5000 Dielectric strength CASE to MAINS gt 1500 Vims Dielectric strength MAINS CASE to A P gt 1500 Vims These tests need only be executed if repairs have been made in the mains part or in the output circuits 3 PERFORMANCE CHECK Service information Phyaction Supporta Page 9 4 TROUBLE SHOOTING 4 1 Introduction If a Phyaction Supporta is defective in most cases the unit will detect an error in the automatic self test A full description of this test will therefore help the service technician in finding the fault In the next section you will find this description In section 4 3 you will find a list of all possible error messages and possible causes 4 2 Description of the automatic selftest 4 2 1 General The selftest
35. ice information Phyaction Supporta Page 1 CHAPTER 2 THEORY OF OPERATION 2 1 Introduction In this chapter the electronics of the Phyaction Supporta will be explained A description on the level of functional block diagrams will be used The electronics will be described in more depth when safety aspects are concerned The Phyaction Supporta is a device for ultrasound electro and combinationtherapy The user the physical therapist can set a number of parameters The parameters are converted in electric signals for the ultrasound and electrotherapy circuits by a microcontroller The microcontroller continuously checks whether the ultrasound circuit produces the proper amount of ultrasound power The microcontroller also checks the safety circuit each time the Supporta is switched on Further it checks the patient resistance during treatment to verify the patient current 2 2 General block diagram The block diagram of the Phyaction Supporta is shown in the figure below Charger Power Suppl r Service interface Mains 2 2 2 2 2 3 supply Electro Micro Ultrasound controller therapy core therapy 2 2 4 224 2 2 5 Current Outputs Ultrasound head The microcontroller core uC controls the complete device interactions between the device and the user are executed via the user interface The user interface contains the switch panel the ultrasound
36. kle strap You should also take precautions when you store or sent circuit boards by using special ESD protective packaging materials 5 2 Replacing the battery To exchange the battery you first remove the two Allen screws on the bottom side Remove the battery lid Disconnect the battery connector and replace the battery Connect the battery connector and close the battery compartment with the two screws For the life of the battery it is best if you charge the battery completely every time you charge it i e connecting it to the charger for 14 hours It is not allowed to dispose of the battery with domestic refuse Instead it must be discarded as small chemical waste for recycling 5 3 Exchanging the software or the main board PCB 492 If you want to exchange the software or the main board of the appliance you first open the appliance as described in section 5 1 and take the necessary precautions to prevent electrostatic discharges The software eprom is mounted on and can be replaced without soldering The software version is printed on the label of the Eprom i e V1 02 After replacing the Eprom close the appliance Carry out the functional and safety test as described in section 5 1 5 4 Exchanging the software or the main board PCB 492 To exchange the main board you first open the appliance as described in section 5 1 Remove the two intensity knobs Remove the power cable and the output cables from the m
37. l m Joera 21 ss Toro er E ps ia a 71 O 21 8 C 5 4 dE mpm pen 21 5 9172 5 L 4 60 21 fect lt TE mm qa 517 3 zr US L EJ zol N j a amp 21 gt a a 7 we EFFI SS zi 2 a x amp N 4 el CT J Z m SE E FTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTI o gt 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11
38. o the uC via a tail The user can use the keys to set and change a number of parameters such as pulse width duty cycle and treatment time The top layer of the switch panel is made of polyester 2 2 2 2 The ultrasound intensity control See section 2 2 5 1 2 2 2 3 LCD An alpha numerical LCD with LED backlight is used for the display During battery operation the backlight will be switched off by the uC for power saving when no keys are pressed The LCD displays the treatment time and some parameter settings of the electrotherapy The contrast is controlled by the uC through a switched capacitor voltage inverter 2 2 3 The power supply circuit 2 2 3 1 The supply selector If present the device is powered by the battery unless an active mains supply is connected The supply selector determines whether the battery or the mains supply is to be used 2 2 3 2 The Battery The battery consists of ten rechargeable NiCd cells with a capacity of 1 7Ah The battery voltage is typical 12 V with a maximum of 15 V The battery voltage is monitored by the uC and it Switches the device off if the voltage drops to 10 V 2 THEORY OF OPERATION Service information Phyaction Supporta Page 3 2 2 3 3 The charger The battery can be charged with an external charger which fully charges the battery in 14 hours The charger is a transformer and rectifier without smoothing capacitor generating a DC current of 200 mA average The open circuit voltage is app
39. ot activated 430 12 enrET15OREF is given With the ET testline TESTY4 an output of 8 mA is simulated As this is above the 3 3 mA the ET errorline should become active If it doesn t 430 11 1 is given This completes the 15096 comparator check 4 TROUBLE SHOOTING Service information Phyaction Supporta Page 13 4 2 8 Maximum current safety limit check This comparator checks for currents above the maximum allowable output current and should report an error if the output current rises above 110 of the maximum allowable The maximum current is simulated by a testline connected to the comparator network 1 Test the maximum current safety limit Activate testline TESTY1 this changes the voltage of the limit comparator If the ET errorline does not become active 440 10 enrETLIMIT is given This completes the maximum current safety limit check 4 2 9 ET Intensity regulator guard test 1 Test the ET intensity regulator ground guard The testline TESTY6 is activated this changes the regulator guard voltage If the ET errorline does not become active 450 20 enrETPOT is given 2 Test the ET intensity regulator reference guard The testline TESTY5 is activated this changes the reference voltage of the guard circuit If the ET errorline does not become active 450 10 enrETREF is given This completes the check of the ET intensity regulator guard All testlines are deactivated and the output is set to mA 4 2
40. parators switch the safety relay off which interrupts the patient current Even in case of maximum intensity this will happen so fast that the energy contents of the resulting pulse will be below the allowed limit Once the safety relay has been switched off it remains in this state and the device must be switched off 2 2 4 7 Reference voltages There are two reference voltages in the safety circuit 4 096 V used for the safety comparators and 2 50 V used for the ET potentiometer and ET and US signal generation The reference voltage ETref for the DAC is derived from the 2 50 V via the electrotherapy potentiometer 2 2 4 8 Test control circuit During the selftest of the device the safety circuit is tested guard and ground connection of the potentiometer 15096 and the limit to ensure that the safety circuit works 2 THEORY OF OPERATION Service information Phyaction Supporta Page 5 During a fixed time the uC can activate the safety relay After this time has expired the uC can only switch off the safety relay e g when an error has been detected The relay De energize ensures that no current can flow through the patient during the selftest 2 2 5 Ultrasound circuits 2 2 5 1 The ultrasound intensity control The ultrasound intensity is set by a potentiometer with a switch Both the potentiometer and switch are directly connected to the uC From the position of the potentiometer the uC calculates the amount of power that is
41. roximately 24 Vdc The charger comes in 3 different models model 401 100 120 V with an American style mains plug model 403 220 240 V with an European style mains plug model 404 220 240 V with a British style mains plug The charge current can only reach the pcb if a battery is connected because this current is routed through the battery connector which contains a shorting link 2 2 3 4 The mains supply The mains supply is a switch mode power supply with a voltage of 18 V typical and a maximum average DC current of 1 8 A The voltage supplied to the pcb must never exceed 20 V due to limited component voltages The voltage should be 16 V minimum because at lower voltages the internal power source selector will not operate properly 2 2 3 5 Internal battery charger When the mains supply is connected and a battery is present a current source serves as internal battery charger charging the battery with approximately 170 mA 2 2 3 6 The 5 V power supply The voltage from the supply selector is converted to 5 V by a switch mode power supply SMPS This SMPS can be switched off by the controller in case of a low battery voltage with the signal 5V SD active low After power up there is a limited time in which the uC should take over the SMPS enable signal from the bootstrap circuit For fault finding purposes jumper J101 force 5V is provided Shorting this jumper will keep the 5V up even if the uC fails to assert
42. t 14 of 22 0 1 2 3 4 5 6 7 8 9 10 11 12 13 44 CON806 TST ENN RESETN RXD BSL ENN CONSO1 CON201 m io CON202 L803 4 CON901 CON805 G904 G905 CONSOLE CON601 e 204 USFRQ 2 USmod PCB493 NOTICE PCB492 P306 P303 150 SIMUL J401 5Vad TP409 e TP301 ETSET P438 ETerror COLOR CODE JP801 CAN BE PLUGGED INTO CON101 CONNECTING THE BATTERY ACROSS BAT AND IN THIS WAY THE BOARD IS POWERED BYPASSING SW801 AND THE SUPPLY SELECTOR CIRCUIT BLACK BROWN RED ORANGE YELLOW GREEN BLUE PURPLE GRAY WHITE 0 00 M40 Ul UNO ETI SENSE CON701 e 5 BL DRV F101 E T4AL250V CON101 CON802 TR CHRG 7 4 5 WO20 TP403 ETI a m TIMER g Z 520s TP4029 REF SVS TP401 REF4V1 UNIPHY B V N H Property of The Netherlands Drawn by Beun Approval Title Size Document Number REV Poe C eoo ser Date March 5 1997 Sheet 16 of m o lt 0 1 2 5 4 5 6 7 8 9 10 11 12 15 14 15 16 17 18 19 20 21 22 25 24 25 26 i JT T Fn Gt
43. t and an error message will be displayed The following tests are performed 1 Microprocessor internal check Some ALU instructions are executed and verified against the known results Also verified is whether the contents of some special function registers which should be O after a RESET are indeed O In case of a failure 100 xx errCPU 2 Internal RAM The internal RAM will be tested with a write read test In case of a failure 100 00 errCPU 100 10 enrCPU IRAM 3 External data storage The external 32K RAM will be tested with a write read test This also checks most address data and read write control lines In case of a failure 110 xx errXMEM 4 TROUBLE SHOOTING Service information Phyaction Supporta Page 11 4 External program storage By means of a checksum test on the accessible part of the 128K EPROM the data integrity of the program stored is tested In case of a failure 110 20 enrXMEM_ROMO A small part of the EPROM memory space is overlapped by processor internal addresses These are not checked After these tests it can be assumed that the processor kernel operates correctly 4 2 5 ET Initial Test The following power up conditions are checked 1 ET ERROR line should be active If not 420 40 enrETERROR 2 Intensity regulator should be at zero checked by means of the potentiometer switch and analog input If switch not at zero 400 10 enrSWNOTO If analog input larger than 0 16V 10 400 20 enrTOHI
44. tage USV of the SMPS If the output voltage is too high e g due to a hardware failure the uC will shut down the ultrasound circuit and give an error message 2 2 5 5 The power stage The power stage is a switched half bridge The generated output is controlled by USV generated by the SMPS The above mentioned modulator controls whether the power stage is active Power MOSFETs are used as switching elements The MOSFETs are driven by with a small delay in the on ramp to prevent them of being active simultaneously 2 2 5 6 Impedance matching The ultrasound transducer shows mainly a capacitive load Its impedance differs among other things with the size of the transducer and its operating frequency For this reason the can match the impedance by switching one or two inductors in series depending on the head being 2 THEORY OF OPERATION Service information Phyaction Supporta Page 6 used ensure that all devices give the same output the coils for both the large head and the small head are each adjusted to a specific inductance Do not change this adjustment The uC monitors the match of inductor s and head by checking the current USI through the MOSFETs This current is proportionally to the current through the head If there is a mismatch due to bad acoustic coupling USI will increase and signal the wC to decrease the ultrasonic power The duty cycle is set for the ultrasonic output power not to exceed 0 2 W cm When the
45. test is carried out once a year If the appliance is serviced the full IEC 601 1 tests have to be carried out A short description of these tests is given in section 3 2 3 1 1 Visual inspection Passed when all applicable items are answered with YES Is the user manual there Is the casing of the appliance undamaged Is the label well readable Are the controls display lights and connectors all right Are the power input and the equipotentiality busbar all right Are ultrasound treatment heads cables and connectors undamaged Pay special attention to possible leaks in the treatment heads such as cracks or loosened seems Are the labels on the ultrasound treatment heads readable 3 1 2 Functional test Passed when all applicable items are answered with YES or not applicable Is the automatic selftest executed successfully at power on Is the appliance able to detect both treatment heads 1 cm 4 cm Is the ultrasound output correct for both treatment heads 1 cm at maximum intensity 4 cm lt lt o o 2 2 3 1 3 Test of the electrical safety according to VDE 0751 Enclosure leakage current Patient leakage current 3 PERFORMANCE CHECK Service information Phyaction Supporta Page 8 Also register the measured values the device records and compare them with the values measured in the past to alert for a possible potentially dangerous tendency 3 2 IEC 601 1 safety tests For the
46. the 5V SD signal 2 2 3 7 The charge indicator When the battery is charged the charge indication LED on the console is activated The circuit driving the LED is independent of the 5 V SMPS see paragraph 2 2 3 6 because the circuit and the LED should also work when the device is switched off 2 2 4 Electrotherapy circuits 2 2 4 1 General To ensure the safety of the patient both the wC and the safety circuit monitor the generated current against the set value and limit value allowed by the IEC standard 2 2 4 2 Signal generator The 4 kHz carrier wave of the MF signal is a square wave not a sine wave generated directly by the uC The amplitude modulation is done by 8 bit multiplying DAC This DAC is controlled by 2 THEORY OF OPERATION Service information Phyaction Supporta Page 4 the with DMA control The reference voltage for the DAC is directly derived from the wiper voltage of the current control potentiometer The TENS pulses are also generated by the uC There is an additional hardware TENS pulse limiter ensuring the pulse width not to exceed 200 ws and that the pulse frequency not to exceed 400 Hz 2 2 4 3 Output stage The signal from the signal generator drives the output stage This circuit has two adjustments one for the maximum current of 100 mA peak and one for the minimum current of less than The output stage consists of a transformer driven by 2 FETs with a very low on resistanc
47. y 20 Tens frequency 30 base frequency 40 Spectrum frequency 111 ET waveform 00 Potmeter 20 Display timeout 30 timeout 20 System temperature to low 30 System temperature to high 10 Battery deep discharge 50 US head record incorrect 20 ET Dose regulator l C 1 B ET 4 TROUBLE SHOOTING Service information Phyaction Supporta Page 15 4 4 Adjustment procedures There are no adjustments that can be carried out in the field All adjustments should be carried out by Uniphy because of the need for special test and measurement equipment 4 5 Jumper Settings Supporta J101 not placed to force the 5V power supply on normally activated by the microcontroller not placed to verify the level of the 150 safety circuit electrotherapy p2 3 p4 5 to connect the safety circuits to the safety relay driver and the microcontroller In alternate position p1 2 p3 4 the safety circuit is disabled TP408 TP409 not connected if connected the timer that disables the safety relay on control line is stopped so the microcontroller will be able to set the relay on as long as the test points are connected Note The shunt should be applied before power on 4 TROUBLE SHOOTING Service information Phyaction Supporta Page 16 5 EXCHANGING BOARDS AND MODULES 5 1 Introduction
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