Philips-FW-650-C-Schematic(1) 电路图 维修手册.pdf

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1、1466 “1” 1461 1460 “3” “7” 1464 “2” 14621463 14591458 “4” OPEN “5” “6” 1 P11 2 3 4 5 6 P1P3K0K1K2 1405 to control board 1404CDC-KEYS DECK 1 PLAYBACK DECK 2 REC/PLAYBACK 1720 1712 1711 1730 83 FFC JST WIRETRAP DIPMATE 1346 1345 TRAFO 5 8302 4 8301 18291833 79 80018002 13031301 0013 5 1 POWER 0011 001

2、4 5 8303 1304 LS 1825 8011 19 1741 1832 1742 11 1831 18281505 1553 15621830 COMBI 0007 CDC7 LIGHT 85042 8010 15 1404 6 8007 1405 CDC KEYS 1409 5 8005 CONTROL 1403 FOR ECO4/TU92 RDS WIRING DIAGRAM 1200 17 8009 KARAOKE 6(9, 4) 8004 1559 3 0004 IN/OUT 18331153 TUNER CDC7-MODULE CDC Electronic CDM 12.1

3、1800 CD INTERFACE 1801 1802 FM Frontend FM Osc. FM Mixer AM Mixer AM Osc. AM Frontend 16 18 AGC AM IF AM Det.20 24 VL AM-Osc. to Synth. VL C 1103 FRAME AERIAL B AFM 1101 (1104) 2321 VLVL FM-Osc. to Synth. 13 10.7MHz 11 IF1 9 10.7MHz 7 IF2 FM Det. 141510 450kHz450kHz AM IF AGC AM Det. AGC IF Buffer T

4、uning Ind. 126 +5V AM WAVEBAND SWITCHING LOGIC 28 4 LF Filter 29 MPX 5 Discr. RADIO IC TEA5712T / N2 Stereo Decoder left right Stereo 2 3 30 MUTE 32 VCO AM/FM 3127 VCO 121514 OUT5 1317 OUT4OUT6 MONO / STEREO AM / FM SEARCH SENSITIVITY 2 5 3 4 IF Counter OUT3 10 OUT1 119 OUT2OUT0 Version IN0 IN1 7 8

5、SHIFT REGISTER Reference Osc. 24123 Vss 7.2MHz ? :N 21 Loop filter +V VL 1 20VDD +5V 19 18 FM Osc. AM Osc. Synthesizer IC LC7218M 1153 3 3 left right +V +5V 2 1172 STSIG STEREO CE Counter Data CL TUNER BOARD ECO 4 VA mini BLOCKDIAGRAM 16 1356 T5A 1357 1358 17 16 15 14 7 6 13 12 5 4 10k 11 10 2 1 9 8

6、 1008! 180 - 220V? 30V? th. fuse NTC 6 5 4 3 2 1 1355 220/240V110/127V ! 6353 1N4004 ! 6354 1N4004 SD G STP7NA40 7351 ! 3341 2.2M! ! 6351 1N4004 ! 6352 1N4004 ! 2351 10n 1352 ! 5350 ! 1350 N ! L 3343 470k! 3349 150k 6343 1N4148 6344 1N4148 2345 10n 2344 0.22 6341 1N4148 6342 1N4148 6 5 4 1 2 3 7353

7、CQY80NG! 2343 10 6345 BZX79-C12 3351 470k 6340 1N4148 3350 270k 3346 470k 1 2 3 4 1345 1 2 3 4 0011 8301 !ITEM 1356, 1357, 1358, 1359 1 2 3 4 5 6 7 1346 1 2 3 4 5 6 7 0013 8302 . VVoltages measured during operation Voltages measured in ECO Mode (Stand by and display off). V 4V? 22V? 9V? 1V? 2362 100

8、n 2363 100n ? ? +- 27V D5SBA20 ! 2364 100n 2366 10n 6361 2361 4700 2360 4700 6384 BZX79-C12 3383 6.8k 3379 220 2379 47 3372 15k 3371 15k 2377 2.2 3382 6.8k 3370 1k 3369 1k 4.2V 2.4V 3378 10k 7369 BC558 4.8V 3386 100 1.3V 2378 220 3388 4.7k 7368 BC558 5.6V 5.8V 3384 12k 3398 33k 3380 680 NTC +5.6V 63

9、96 1N4148 6397 1N4148 6368 1N4148 3373 4.7k PWI 6367 1N4148 3387 4.7k 6373 BZX79-F8V2 2373 47n 3375 4.7k 18V12V 17.2V 2375 2.2 7360 BD438 3360 220 3365 220 7363 BC548 17.1V 3361 47k 0.6V 2367 1 3374 330 2374 1n 0.6V7364 BC548 0.6V 3363 82k 3362 47k 3364 1k 6362 BZX79-B11 2368 100 6386 BZX79-C36 0V 1

10、8V 7376 BT151! +24V +16V +12V STBY +5.6V 0.6V 4.4V 4.8V 3368 18k 3367 22k 7366 BC558 3385 3.9k 7358 BD437 +16V 5.6V 6358 BZX79-B6V2 2357 1 2370 47 2371 47 6366 1N4148 6363 1N4148 6365 1N4148 6364 1N4148 Voltage Doubler 2372 47 3377 4.7k 2376 4.7n 6374 BZX79-C24 3376 470 7374 BC558 3391 220 3390 220

11、0.3V? 4.5V? 6391 BZX79-C4V7 6393 1N4148 6392 1N4148 2390 47 4.5V AC 4.5V AC -30V PWI NTC PWI NTC to/from POWER BOARD AF-Part POWER BOARD / Transformer Part 13521356135713586351-6354 T2A/22T5AT2.5AT5A1N4004GP T3A/21T6.3AT3.15AT6.3A1N5395GP T2A/37T5AT2.5AT5A1N5393GP VERSION TABLE (marked components) p

12、ositive halfwave negative halfwave Signal path 3357 0.47 2W 3344 0.22 1W ! 3345 47k 3340 22k 3342 22k 7341 BC548C 2352 100n 7342 BC558 7352 BT151! SOAR Protection 7351 1355 VOLTAGE SELECTOR for /21 only LIFE PART ! 6357 1N5395GP ! 6356 1N5395GP 2365 100n 18V 6370 BZX79-C4V7 +5.6V to POWER BOARD AF-P

13、art A B 27V 18V 12V 2391 22 5.6V VEVM T5A T2.5A 150 C? T2AH 230V 110-127VAC 220-240VAC FM IF Comp arator AM fronted 1 18 29 Vt Vt C AM FRAME AERIAL B 78 BIRDY FILTER 2616245 7 LF Filter 21 3 RADIO IC LA1851N Stereo Decoder left right Stereo 2 3 30 23 VCO 10 121517 OUT6 1314 OUT4OUT5 MONO / STEREO AM

14、 / FM 2 5 3 4 IF Counter OUT3 9 OUT0 1110 OUT2OUT1 Version IN0 IN1 7 8 SHIFT REGISTER Reference Osc. 24123 Vss 7.2MHz ? :N 21 Loop filter +V Vt 6 20VDD+5 18 19 AM Osc. FM Osc. Synthesizer IC LC7218M 1117 4 4 left right +V +5V 3 1112 MUTE STEREO CL Data Counter CE A 1110 MIXER 7 8 Osc. out 1 Ant. 5 V

15、varicap 6 Vt+FM Vcc 4 3 AGC LOCAL/DISTANCE TUNER BOARD 7116 VLoop LOCAL/ DISTANCE MW/LW 7101 FM Det. 4 AFC 1 2 3134 Vref. 96kHz 9 FM Level Det. AGC25 METER 7115 AM Mixer AM Osc. 30 SEARCH LEVEL FM SEARCH SENSITVITY SEARCH LEVEL AM AM IFAM Det. 19 IF Buffer FMIF 16 6 +V Vcc 18 Tuning Ind. FM AM MUTE

16、1712 13 456kHz Vss Vref 28 3131 CROSSTALK STSIG RDS VLoop +FM 5 1111 FM FRONTEND IF out 5105 BLOCKDIAGRAM DW_SE5/2003 1 FW650C.prn C:ArchiwumSchematySE5_2003FW650CFW650C.cdr 27 marca 2003 10:58:22 Profil kolor w: Wyczone Penokolorowy Domy lna liniatura rastra RadioFans.CN 收音机爱 好者资料库 FM IF1 37 8 8 6

17、B ANTI BIRDY FILTER 3 CONTROL 29 28 27 11 +FM A 1102 7 Osc. Out 1 Ant1 5 VT 3 AGC BLOCKDIAGRAM 5 110 AFC 7 FM FRONTED IF Out 8 Fo Fa MT MT f = f+ f oinif 4GND F 10.7MHz if 6 +B +FM STABILIZER 723 VCC1VDD VCC1VDD 35 FM-IF2 34 V Stab B 33 FM-IF2I FM IF2 38 V Stab A FM-IF1I in FM Osc. CHARGE PUMP I-Tun

18、e 2 AM-RF C Ripple AM OSC. AM FRONTEND AM-Osc. AM MIXER FM GND 4172642 RF GNDIF GNDDig. GND RF GND 40 AM-MIX Out 450kHz 41 IF-AM 5111 AM-IF1 in FM DET 18 FM-Demod 10.7MHz AGC 44 AGC AM IF AM DET 450kHz IF-AM 5112 36 AM-IF2 450kHz AM-DET 5114 32 AM-AFC 19 AFC- 20 AFC+ 21 AF-Out 21 Fieldstrength Indc.

19、 XTAL OSC WRITE Enable DATA CLOCK 31 39 30 P1 FM/AM P0 STEREO DECODER MPX-In 912 VCOLPF 24 Mono/ Stereo 14 Left 13 Mute 15 16 Right PILOT Filter 3142 VCO 25 75kHz RDS 22 VCC2 VCC2 TEA5762 VCC1 VDD VCC2 4 VCC 3 RIGHT 1 LEFT 2 GND 41124 3 ENABLE 1121 3 4 DATA 5 CLOCK 6 STEREO 2 1 RDS GND RDS 5123 MW 5

20、122 LW AM-OSC MW/LW - SELECTION 5102 MW 5103 LW 2106 AM-RF 10.7MHz 10.7MHz PLAY BACK DECK A REC/PB DECK B 13 12 erase head S3 S2 S1 S0 S4 SELECTOR HEF4952 REC LINE-IN Mode STOP PB deck A PB deck B REC (line) DUBBING S0 0 1 0 0 1 S1 1 0 0 1 0 S2 S3 S4 ERASE OSC. BIAS GEN. BIAS LEVEL BIAS SYMM. REC EQ

21、UALIZ. PB EQUALIZ. FILTER PB-LEVEL DECK A PB-LEVEL DECK B REC-IN REC LINE-OUT DETECT. REC-OUT REC-LEVEL Vref 1011 TAPE FUNCTIONAL DIAGRAM TAPE PART MOTOR DRIVER MOTOR SPEED REGULAT. HS TAPE SPEED HS / NS SOLENOID DRIVER SOL-B EOT-B VCC-B SOLENOID DRIVER SOL-A solenoid deck A EOT-A hall-IC deck A VCC

22、-A CRO2-A COMBI BOARDTape logic / P part FM frontend FM Osc. FM Mixer AM Mixer AM Osc. AM frontend 43 2 VLOOP C 1103 AM-FRAME AERIAL B AFM 1101 (1102) 339 10.7MHz 37 IF1 35 10.7MHz 33 IF2 FM Det. 404136 450kHz450kHz Multi- plexer 32 2 LF Filter 18 Discr. RADIO IC TEA5757T Stereo Decoder right left s

23、tereo 15 14 24 25 1124 4 4 right left TUNER BOARD ECO5 systems 5 6 AM-RF AM-Osc. FM-Osc. VLOOP VLOOP Charge pump 8 1 38VSt a bA 34VSt a bB VLOOP 237 VddVcc1 VSt a bAVSt a bB 22 Vcc2 AM IF AGC AM Det. 44 Pre- scaler VSt a bA VLOOP FM-RF VSt a bB 1011 5 9 VCO AFC 450kHz VSt a bB 19 AFC- 20 AFC+ Refere

24、nce Oscillator CONTROL 75kHz P0 30 P1 31programmable output ports clock 27 data enable 28 29 MW/LW AM-RF AM-Osc. 4 1 Vcc Vcc2 Vdd Vcc1 1126 4 1 Version stereo clock enable data 3 AM-FRAME. AERIAL 4 6 3 1 5140 312211821101 AM/IF 2 16151413121110987654321 FM RF in AM IF1 in AM MIXER out FM MIXER out V

25、 Stab A FM IF1 in AM IF2 FM IF1 out V Stab B FM IF2 in IF GND FM DEMOD PILOT FILTER R out L out IF count 0.8V 1.4V 1.4V 1V 1.4V 0.7V 1.4V 0.7V 1.4V 0.7V 1V 1V 0.6V 0.6V 1.7V FM Frontend 17181920212223242526272829303132 FM RF GND AM RF in RIPPLE AGC FM RF out SUB GND FM OSC AM OSC VCC TUNING INDIC AM

26、/FM SWITCH R VCO AM/FM OUT MPX IN STEREO LED LOOP FILTER M/ST SWITCH MUTE 0V 2.1V 0.7V 0V 0V 0V 5V 1V 0.7V 1.3V 0V 0.8V 0.7V 0V 1.2V 1.1V 1.3V 0.2V 5V 1.6V 0.1V FM MIXER FM OSC FM IF1 AM IF FM IF2 FM DET IF AMP MATRIX AM/FM/IF COUNT AMP FM IF AM IF SYNCH DET SOFT MUTE 38kHz SDS PILOT PRES DET PHASE

27、DET SWITCH CONTROL AM/FM SWITCH MONO/ST SWITCH LED DRIVER VCO DIVIDER MUTE 18/19/38kHz AM FM V/S CONV AM/FM INDIC MUTE AM DET STABILIZER V Stab AV Stab B IF GND +5V AM OSC AM MIXER AGC AM Frontend 7140 TEA5712T 2141 2.2 5145 CDA10.7MC40 FM/IF SFE10.7MS3 2147 10n FM/IF SFE10.7MS3 5144 5143 T012 4 6 3

28、 1 5142 F7MCS-12216N AM/IF 2 3231 0 3151 1.5k +5V printed T002 2 A100p C 2150 10 2151 10 0V 0V 7105 2SA838B 0.7V 3157 27k +5V 2107 1n printed Q-MULTIPLIER 5109 RF1.5T x2115 3-11p FM-RF 6109 1SV228 3108 100k 9134z 3206 220 only for /01 T009 9199 2142 1 3159 56k MONO = Low STEREO = Low Tuned = Low AM

29、= High T010 T011 4 2167 100n AM = HIGH 2169 330p 3248 0 BIRDY FILTER 6140 1N4148 3147 180k 3149 56k 3148 100k VCO152kHz 9105z 5125 0.47 only for /01 5120 RF1.5T printed 2121 15p 6124 1SV228 2120 470p 3120 5.6k FM-OSC 2143 0.47 2144 0.47 3142 2.2k LOOP FILTER STEREO DECODER 3235 0 FM, MW, LW EUROPE F

30、M, MW, LW EAST EUROPE FM, MW USA/17 FM, MW OVERSEA /01 FM, MW, LW, SW FM, MW, SW X = DIODE MOUNTED 6121 X X X X 61226123 X X XX X VERSION PROGRAMMING DIODES 0V2 PC74HCU04T 7172 FM/AM SWITCH 1 1 0V 5VFM/AM 3144 10k +5V 3153 68k 6170 1N4148 3186 100k +5V 7168 BC858B 0V 0.7V Autostore with 1-level sear

31、ch TUNED = Low T040 Tuning-Indic STEREO = Low MONO = Low AM FM 0V V 0 5V IF 200mVpp 0 5V Found strong signal during SEARCH 6 4 1 3 2 5123MW 110H 2136 27p 6 4 1 3 2 5122xLW 110H 3243o 0 3241o 0 2125x 27p 2129x 390p 1% 7123x BC848C 3129x 4.7k LW 0.7V 0V 2122 1n 7120 2SC1047 3121 100k 3119 470 3122 470

32、 2123 1n +5V FM OSC AMP 2124 10n 3.4V 0.7V 3106 100k 2185 100n 1 2.7 6105 HV1V02H 2112 100n AM OSCILLATOR 3244 0 3238x 0 7121x BC848C 0V 0.7V 3124x 2.2k LW/MW LW 3107x 2.2k 2126x 100n 7102x BC817-40 3222o 0 3221 0 0V 0.7V LW/MW 71042x BC848C T005 3245o 0 2114x 100p 5% 2110o 22p 2113 4-20p 61 2 43510

33、8x LW T006 654 123 MW 5107 2 1105 1 B MW/LW-RF 3242 0 3132 4.7k 3.65 6105 HV1V02H 3224 0 2138o 33p 2135 560p 1% 3226o 0 3229o 0 2139xB 2.2n 3128 10k 3174 10k LW LW/MW 3125x 4.7k 0.7V 0V 7128x BC848C Tuned down Tuned up 3173 15k T015 1 2173 47 3193 2.2k +V 7170 BC848C 0.6V 7171 BC848C 3175 100k +5V 5

34、V 1V 2172 1.5 3172 4.7k2171 4.7n 2170 4.7n T036 3170 4.7k 2177x 100n 7179x BC848C LW=high 0V 0.7V 3177x 10k LOOP FILTER 121110987654321 0V 0V 0V 0V 0V 0V 0V 0V 0V 2.4V 131415161718192021222324 5V 0V 0V 0V 2.6V 5V 1V 2.7V 0.8V 0V 0V OUT3 OUT2 OUT1 OUT0 IN1 IN0 SYNC DATA out CLOCK DATA in CE Xin SHIFT

35、 REGISTER LATCH OUT4 OUT5 LOW CTR HIGH CTR OUT6 AMin FMin VDD PD1 PD2 VSS Xout UNIVERSAL COUNTER PROGR. DIVIDER COUNTER REFERENCE DIVIDER 1/2 PHASE DET. Charge pump 7173LC7218M SYNTHESIZER T038 6123 1N4148 6122 1N4148 6121 1N4148 3184 22k 3183 22k VERSION PROGR DIODES 5170 7.2MHz 2180 27p 2181 12p 7

36、.2MHz 1 2 3 4 5 6 1172 CL DATA COUNTER/DATA CE STEREO STSIG 2 T027 T028 T029 T030 T031 T032 31921.8k 31911.8k 31901.8k 31891.8k 3171100R 4 3 2 1 1153 AF_left GND AF_right +V T020 T021 T022 T023 3 11-16V +V to 3193 3194 3195 3197 7175 TO/FROM CONTROL BOARD TO/FROM CONTROL BOARD Tuning_indic 3176 100R

37、 L=valid_signal 5V 0V Weak signal Strong signal 5V 0V 152kHz 150mVpp stereostereomono to 2193 3110 3111 3112 3113 3116 3122 3123 3135 3144 3151 3157 3160 3161 3175 3180 3182 3185 3186 3187 7140 7167 7172 7174 +V 11-14V 3240 47R 3194 330R 3195 330R 3197 330R 4.8V +V 5.1V 2184 100 6174 BZX79-B5V1 3167

38、 0R STABILIZING CIRCUIT +5V 0V V 0V=no communications FM/AM VCO KILLER IF 2179 100p 2178 1n 2134 1n 3112 10 2183 100n +5V 4 PC74HCU04T 7172 3 1 0V 5V IF-COUNT = HIGH 3156 10k 6154 1N4148 3141 220R IF IF T013 2155 18n/27n* 9191 3163 1k 2161 1 2154 18n/27n* 9190 T014 3162 1k 2160 1 11 PC74HCU04T 7172

39、10 1 MW/LW 5V 0V 3123 22k +5V 0V 5V LW/MW 0V 5V 9 PC74HCU04T 7172 8 1 5V 0V LW = Low AM-WAVEBAND SWITCHING LOGIC (MINI) 2 1 4 3 7 8 5 6 6105 HN1V02H 141312111098 1234567 VCC GND +5V 5V 7172 PC74HCU04T ofor 2-band version only xfor LW version only *, y for USA version only znot for all versions FM AM

40、 AF SIGNAL PATH V V Vdc MW mode Vdc LW mode Vdc FM mode stereo VEVM T007 DISCRIMINATOR 3109 2.2k 3236o 0 3188 1k AM IF FM IF AM OSC PADDING DW_SE5/2003 2 FW650C.prn C:ArchiwumSchematySE5_2003FW650CFW650C.cdr 27 marca 2003 10:58:25 Profil kolor w: Wyczone Penokolorowy Domy lna liniatura rastra RadioF

41、ans.CN 收音机爱 好者资料库 FB FB SOFT- CLIPP. FB VOL1 lound. l fte BASS left TREB l fte VOL2 l fte LOGIC CONTROL VOL1 lound. right BASS right TREB right VOL2 right FB FB SOFT- CLIPP. FB SOURCE SELECTOR AUX-L TAPE-L TUNER-L CD-L CD-R TUNER-R TAPE-R AUX-R LINEAR OUT-L short-circuit only for sets without Karaok

42、e feature LINEAR OUT-R short-circuit only for sets without Karaoke feature I C INTERFACE 2 TEA6321 IIC-SCL IIC-SDA FRONT L REAR L REAR R FRONT R INCRED. STEREO L INCRED. STEREO R MUTE L-INL-OUT HEADPHONE L-AUDIO R-AUDIO RAMOSC MAIN CONTORL DACLPFADCLPF DIG. ECHO M65844P MIC AMP. MIC/ECHO MIX +6V MIC

43、 AMP. MIC 1 MIC 2 +6V MIC SENSE 0V . if no mic connected 2V . if mic connected but no signal on input 2.5V . mic & signal KARAOKE BOARD(not for all versions) HIGH if no mic connected SWITCHING NETWORKLOGIC VOC. FADER BA3837 L-OUTL-IN R-OUT R-IN VOCAL A VOCAL B VOCAL C FUNCTIONAL DIAGRAM AF-PART LOGI

44、C CONTROL VOLUME1 LOUDN. RIGHT BASS RIGHT TREBLE RIGHT VOLUME2 RIGHT SOURCE SELECTORI C 2 7553TEA6321 161514131211 4.5V 4.5V 4.5V 4.5V 8.9V 4.5V INPUT A LEFT INPUT B LEFT INPUT MONO INPUT C LEFT INPUT D LEFT MUTE 10 4.5V 3511 15k 3531 1k 2579 1 2559 10n A 357568k + - 2 3 4.5V 4.5V 8 9.0V +9V 1 4.5V

45、7507 NJM4560M 2535 10p 3547 150k 3505 100k REF_SOUND 2843 0.47 3527 47k 3559 3.3k 2557 0.22 AUX-L CD-L TAPE-L L-IN L-EQUL-EQU L-REC 459 NEQ 6 4599 NK 1 2 3 4 1553 A from/to TUNER +12V 171819202122 4.5V 4.5V 8.9V 4.5V 4.5V 4.5V INPUT A RIGHT INPUT B RIGHT RIPPLE IN INPUT C RIGHT INPUT D RIGHT 23 4.5V

46、 3512 15k 35321k2580 1 2561 47 A 357668k + - 6 5 4.5V 4.5V 4 7 4.5V 7507 NJM4560M 253610p 3548 150k 2558 0.22 3560 3.3k 3528 47k 2844 0.47 AUX-R CD-R TAPE-R R-IN R-EQU R-REC 4595 NEQ 4597 NK REF_SOUND 2555 220n 2556 220n A 3506 100k 2560 47 REF_SOUND REF_SOUND to 3505 3506 RIPPLE IN 24 4.5V 25 4.5V

47、26 4.5V 27 4.5V 28 4.5V 29 4.5V 30 4.5V Front Rear 32 0.2V 31 9.0V VCC 2506 0.22 2504 0.47 3502 22k 2502 8.2n 2538 100p 3594470R AA 35042.2k 2514 5.6n A 12 3 6552 BAV99 21 3 6554 BAV99 2508 270n 2512 330n 2518 470n AA 3508 4.7k 3534 5.6k VOLUME1 LOUDN. LEFT BASS LEFT TREBLE LEFT VOLUME2 LEFT 9 4.5V

48、8 4.5V 7 4.5V 6 4.5V 5 4.5V 4 4.5V 3 4.5V Front Rear 1 4.9V 2 2505 0.22 2503 0.47 2501 8.2n A 2513 5.6n A 21 3 6553BAV99 12 3 6551BAV99 2507 270n 2511 330n 2517470n AA 3507 4.7k 3533 5.6k A 3577 1k 3543 1k A 35032.2k 2537100p 3501 22k 3593 470 1716151413121110987654321 1830 R-REC R-IN L-REC L-IN MIC

49、-SENSE VOCAL-C KEY-DATA VOCLA-B KEY-CLOCK VOCAL-A KEY-STROBE KEY-SENSE KEY-ON n.c +12V R-REC R-IN GND-A L-REC L-IN MIC-SENSE VOCAL-C KEY-DATA VOCAL-B KEY-CLOCK VOCAL-A KEY-STROBE GND-DIG KEY-SENSE KEY-ON TO/FROM KARAOKE BOARD +12V AD + - 2 3 4.5V 4.5V 4 12.9V 1 4.5V 7506 NJM2058M +12V 3557 47k 2527100p 3555 47k 3553 47k REF 2525 470p REF 3551 120k 3565 4.7k 3567 3.3k + - 7506 NJM2058M 6 5 4.5V 4.5V 7 4.5V 2531 1.5n 3583 6.8k 3591 6.8k3597 6.8k REF 3573 4.7k 3509 10k 2515 33n 3585 270k HPREF 2583 33n 3595 270k A 2585 100p + - 2 3 4 1 7501 NJM4556AM 8.2V A 3529 39k 8.2V 3513 100k 351