JVC KD-SX787 Service Manual Download Page 5

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1-5

KD-SX787

Prior to performing the following procedure, remove
the front chassis and the heat sink.

Turn the body upside down.

Insert a screwdriver to the two joints d and two joints
e on both sides of the body and the joint f on the
back of the body, then detach the bottom cover from
the body.

Removing the bottom cover (See Fig.6)

Prior to performing the following procedure, remove
the front chassis, the heat sink and bottom cover.

Remove the nine screws C attaching the rear panel
and one screw D attaching the pine jack on the back
of the body.

Removing the rear panel (See Fig.7 )

Prior to performing the following procedure, remove
the front chassis, the heat sink, bottom cover and the
rear panel.

Remove the two screws E attaching the main
amplifier board assembly on the top cover.

Disconnect connector CN501 on the main amplifier
board assembly from the cassette mechanism
assembly.

Removing the main amplifier board assembly

(See Fig.8)

Bottom cover

Fig. 6

Fig. 7

Fig. 8

Main board assembly

Joints d

Joints e

Joint f

Rear panel

CN501

Summary of Contents for KD-SX787

Page 1: ...azil Contents Safety precaution Preventing static electricity Disassembly method Adjustment method 1 2 1 3 1 4 1 18 Flow of functional operation unit TOC read Maintenance of laser pickup Replacement of laser pickup Description of major ICs 1 19 1 21 1 21 1 22 Detachable COMPACT DIGITAL AUDIO 7 7 SOUND VOL VOL SOURCE R F U D ...

Page 2: ...ft over on some parts of the chassis Therefore pay attention to such burrs in the case of preforming repair of this system Safety precaution CAUTION Please use enough caution not to see the beam directly or touch it in case of an adjustment or operation check ...

Page 3: ...ansport and before installation both sides of the laser diode on the replacement optical pickup are shorted After replacement return the shorted parts to their original condition Refer to the text 2 Do not use a tester to check the condition of the laser diode in the optical pickup The tester s internal power source can easily destroy the laser diode 1 2 Handling the traverse unit optical pickup 1...

Page 4: ...ase the two joints a and the two joints b on the sides Release the two joints c at the bottom and remove the front chassis toward the front 1 2 3 Removing the front chassis See Fig 2 to 4 Remove the four screws B attaching the heat sink on the left side of the body and remove the heat sink 1 Removing the heat sink See Fig 5 Joint c Heat sink Fig 2 Fig 1 Fig 3 Fig 4 Fig 5 Front panel unit Front cha...

Page 5: ...om cover Remove the nine screws C attaching the rear panel and one screw D attaching the pine jack on the back of the body 1 Removing the rear panel See Fig 7 Prior to performing the following procedure remove the front chassis the heat sink bottom cover and the rear panel Remove the two screws E attaching the main amplifier board assembly on the top cover Disconnect connector CN501 on the main am...

Page 6: ...D key control switch board See Fig 10 to 12 Prior to performing the following procedure remove the front panel assembly Remove the four screws G attaching the rear cover on the back of the front panel assembly Unjoint the nine joints g with the front panel and the rear cover Remove the control switch board on the back of the front panel 1 2 3 CD mechanism assembly F F Top cover Fig 9 G G G G Fig 1...

Page 7: ...arrow to release the two joints b Unsolder the wire on the connector board if necessary 1 2 3 4 Removing the connector board See Fig 3 to 5 Before disconnecting the flexible wire from the pickup solder the short circuit point on the pickup No observance of this instruction may cause damage of the pickup CAUTION Unsolder the short circuit point after reassembling CAUTION Fig 1 Fig 2 Fig 3 Fig 4 Fig...

Page 8: ...e 1 Removing the chassis unit See Fig 7 and 8 The shape of the suspension spring L and R are different Handle them with care CAUTION When reassembling make sure that the three shafts on the underside of the chassis unit are inserted to the dampers certainly CAUTION Fig 3 Fig 6 Fig 8 Fig 7 B Connector board DET switch DET switch Pickup Short circuit Joints b Tab c Feed sw holder Tab c Suspension sp...

Page 9: ...nd 12 Prior to performing the following procedure remove the top cover Remove the clamper arm spring Move the clamper assembly in the direction of the arrow to release the two joints d 1 2 Removing the clamper assembly See Fig 9 and 10 When reassembling connect the wire from the loading feed motor assembly to the flame as shown in Fig 11 CAUTION Fig 9 Fig 10 Fig 12 Fig 11 Clamper arm spring Clampe...

Page 10: ...ull out the pu shaft holder from the shaft Remove the screw E attaching the feed sw holder Move the part e of the pickup unit upward with the shaft and the feed sw holder then release the joint f of the feed sw holder in the direction of the arrow The joint g of the pickup unit and the feed rack is released and the feed sw holder comes off Remove the shaft from the pickup unit Remove the screw F a...

Page 11: ...e following procedure remove the top cover the connector board and the clamper unit Turn the trigger arm in the direction of the arrow to release the joint k and pull out upward 1 Removing the trigger arm See Fig 18 and 19 When reassembling insert the part l and m of the trigger arm into the part n and o at the slot of the chassis rivet assembly respectively and join the joint k at a time CAUTION ...

Page 12: ...ease the joint s Unsolder the wire of the select arm L marked q if necessary Turn the select lock arm in the direction of the arrow to release the two joints t The select lock arm spring comes off the select lock arm at the same time 1 2 3 Removing the select arm L select lock arm See Fig 21 and 22 When reattaching the select arm L check if the points w and x are correctly fitted and if each part ...

Page 13: ...nd joint a Move the link plate in the direction of the arrow to release the joint b Remove the link plate spring at the same time 1 2 Removing the select arm R link plate See Fig 21 and 22 When reattaching the select arm R check if the part c is correctly fitted and if each part operates properly CAUTION Reverse the above removing procedure REFERENCE Before removing the link plate remove the selec...

Page 14: ...elease the joint g from the boss of the chassis rivet assembly The roller guide springs on both sides come off 1 2 3 Removing the loading roller assembly See Fig 27 to 29 When reassembling reattach the left and right roller guide springs to the lock arm rivet assembly before reattaching the lock arm rivet assembly to the chassis rivet assembly Make sure to fit the part h of the roller guide spring...

Page 15: ...crew J attaching the loading gear bracket The loading gear 6 and 7 come off the loading gear bracket Pull out the loading gear 5 1 2 Removing the loading gear 5 6 and 7 See Fig 31 and 32 Fig 31 Fig 32 J J Loading gear bracket Loading gear bracket Loading gear 6 Loading gear 5 Loading gear 6 Loading gear 5 Loading gear 7 Loading gear 3 ...

Page 16: ... Move the hang plate rivet assembly in the direction of the arrow to release from the three shafts of the chassis rivet assembly upward Detach the loading gear plate rivet assembly from the shaft of the chassis rivet assembly upward while releasing the joint l Pull out the loading gear 4 1 2 3 4 5 6 7 8 9 10 Removing the gears See Fig 33 to 36 Fig 33 Fig 34 Fig 36 Fig 35 Slot j Slot j Joint k Feed...

Page 17: ...e chassis clamper assembly Remove the two screws K attaching the spindle motor assembly through the slot of the turn table on top of the body Unsolder the wire on the connector board if necessary 1 2 Removing the turn table spindle motor See Fig 37 and 38 Fig 37 Fig 38 K K Turn table Turn table Spindle motor ...

Page 18: ...8250 4 0 V 20k load full scale KD SX780 2 0 V 20k load full scale Output impedance 1k How to connect the extension cable for adjusting Standard volume position Balance and Bass Treble volume Indication 0 Loudness OFF FM 1 3 87 5MHz 107 9 MHz AM 530kHz 1710kHz Dummy load Exclusive dummy load should be used for AM and FM For FM dummy load there is a loss of 6dB between SSG output and antenna input T...

Page 19: ...nal eye pattern opens TOC read out Jump to the first track Play When the laser diode correctly emits Microprocessor commands SEL TC94A14FA 38 LD CN501 15 No disc display When the disc correctly rotates Microprocessor commands DMO TC94A14FA 41 Spindle motor IC561 1 Tracking Servo Loop ON RF signal Rough Servo Mode v CLV Servo Mode Program Area CLV Servo Mode Lead In Area Digital 0 Flow of functiona...

Page 20: ...moving 4V Does the S search waveform appear at IC561 pins 8 and 9 Check the circuits in the vicinity of IC561 pins 8 9 and 15 Check the pickup and its connections Is the disk rotated Does the RF signal appear at TP1 Is the RF waveform at TP1 distorted Proceed to the Tracking section Is 4V present at IC561 pins 6 and 7 Check the spindle motor and its wiring Check the circuits in the vicinity of IC5...

Page 21: ... of the whole optical block do not touch the semi fixed resistor If the laser power is lower than the specified value the laser diode is almost worn out and the laser pickup should be replaced If the semi fixed resistor is adjusted while the pickup is functioning normally the laser pickup may be damaged due to excessive current Is RF output 1 3 0 4Vp p YES NO O K Replace it Replacement of laser pi...

Page 22: ...P120 P127 P100 P103 P90 P95 P80 P87 P70 P72 P60 P67 P50 P57 P40 P47 P30 P37 P20 P27 P10 P17 P00 P06 WAIT ASTB WR RD A16 A19 A8 A15 A0 A7 AD0 AD7 SCK0 SO0 SI0 ASCK2 SCK2 TxD2 SO2 RxD2 SI2 ASCK1 SCK1 TxD1 SO1 RxD1 SI1 ANO0 ANO1 AV REF1 AV SS TIMER COUNTER 16 BITS TIMER COUNTER1 8 BITS TIMER COUNTER2 8 BITS 78K IV CPU CORE ROM RAM TIMER COUNTER5 8 BITS TIMER COUNTER6 8 BITS TIMER COUNTER7 8 BITS TIME...

Page 23: ...n pulse judgment to relation V1 Input for rotation volume detection pulse judgment to relation V2 Key control signal input 0 Key control signal input 1 Key control signal input 2 Level meter input Pul down S METER level input GND connection Non connected Non connected 5V connection J BUS data input J BUS data output J BUS clock I O J BUS data I O terminal Data output for LCD driver Clock output fo...

Page 24: ... input It is L or H and MUTE ACTIVE depends on the PSM setting Non connected ex AMP KILL output GND connection Dimmer detection input At L dimmer ON POWER SAVE 1 ACC and syschronization POWER SAVE L At operation H POWER ON OFF switch outut At POWER ON H The CD power supply control signal output At CD H Mute output At mute ON L Non connected Non connected Non connected 5V connection Non connect Dat...

Page 25: ...1 25 KD SX787 REFR REFL FILTER 8 9 10 11 12 13 14 1 2 3 4 5 6 7 INR NFR FIL NFL CL Vcc INL CL LGND OUTL OUTR RGND CR CR 1 7 8 3220 14 BA3220FV X IC341 IC441 Line out amp 1 Pin layout 2 Block diagram ...

Page 26: ... VCC 1 V when M or H level to CTRL pin and H level to ANT CTRL Connected to ACC Regular 5 7V Output voltage is 5V when M or H level applies to CTRL pin Output for ACC detector L ANT output OFF H ANT output ON Connected to VCC Low battery detect Output voltage is 9V when M or H level applied to CTRL pin L BIAS OFF M BIAS ON H CD ON Output voltage is 8V when H level applied to CTRL pin Adjustment pi...

Page 27: ...Sample as Load Circuit 1 Sample as Load Circuit 1 Sample as Load Circuit 1 1k 1k S1 CL Input Output C L H H A X L H Y Z H L 1 2 3 4 5 6 7 14 13 12 11 10 9 8 HD74HC126FP X IC771 Buffer 1 Terminal layout 2 Block diagram 3 Pin function 1C 1A 1Y 2C 2A 2Y GND Vcc 3C 3A 3Y 4C 4A 4Y Note H High L Low X H and L Z H L X ...

Page 28: ...ting On Time Control Circuit protective circuit Mute circuit Protective circuit Ripple Filter Stand by Switch 11 16 14 13 25 15 10 4 1 12 22 17 19 18 21 23 24 2 3 5 8 7 9 20 6 LA47503 IC351 Power amp 1 Terminal layout ...

Page 29: ... input Front Rch input Signal GND Front Lch input Rear Lch input Power on time control Output for rear Lch Power GND Output for rear Lch Power input Output for front Muting control input Output for front Power GND No connection AC CONT1 GND1 OUTFR STBY OUTFR Vcc1 2 OUTRR GND2 OUTRR VREF INRR INFR SGND INFL INRL ONTIME OUTRL GND3 OUTRL Vcc3 4 OUTFL MUTE OUTFL GND4 NC AC CONT1 GND1 OUTFR STBY OUTFR ...

Page 30: ...3k 33k 33k 33vreg pnptRExternal Signal system power supply Power sytem GND Power sytem GND It is ON OF as for all output MUTE It is ON OF as for all output Signal system GND 16 15 H ON L OFF Level sift Level sift Level sift Level sift H L VN1_SW H OP AMP_A L OP AMP_B LA6579H X IC561 CD driver 1 Terminal layout ...

Page 31: ...stment External PNP transistor base connection 3 3VREG output terminal and external PNP transistor collector connection Signal system power supply Standard voltage impression terminal Output ON OFF terminal CH1 input OP_AMP switch terminal Signal system GND CH1 AMP_B non reversing input terminal CH1 AMP_B reversing input terminal CH1 input terminal and input OP_AMP output terminal 1 Frame FR at th...

Page 32: ...Power supply Serial data and clock inputs used for IC control Chip enable Data is writen to the internal latch when this pin goes from high to low The internal analog switches operate at this point Data transfer is enabled when this pin is high Connection to the 0 5 x VDD voltage generator circuit used as the analog signal ground To a power supply ripple countermeasure application must connect a c...

Page 33: ...11 12 13 14 15 16 1 2 3 4 5 6 7 8 LC75412W IC301 E VOLUME 1 Terminal layout block daiagram 2 Function Pin No 54 53 52 51 55 59 60 61 62 58 50 49 63 64 48 1 46 3 47 2 L1 L2 L3 L4 L6 R1 R2 R3 R4 R6 L5M L5P R5M R5P LSELO RSELO LCT RCT LVRIN RVRIN Single end input terminal Differential motion input terminal Input selector output terminal Then terminal for roudness CR for a high region amends is connec...

Page 34: ... LSI Connects with GND and uses usually Equalizer output terminal The fader block input terminal Drive by low impedance The fader output terminal A rear reception desk side side can be separately narrowed respectively L R of the amount of attenuation is the same VDD 2voltage generation part Connect the capacitor of about several 10 F as a counter measure for ripple of power supply between Vref AVS...

Page 35: ...resistor and capacitor to this pin Serial data transfer inputs Connected to the controller CE Chip enable CL Synchronization clock DI Transfer data Display off control input INH L VSS Display forced off Used for applying the LCD drive 2 3 bias voltage externally Must be connected to VDD2 when a 1 2 bias drive scheme is used Used for applying the LCD drive 1 3 bias voltage externally Must be connec...

Page 36: ...4k 50k 20k 20k 20k 40k 50k PEAK 15k 40k 2k 1 75k 1 3V 2k 1k 180k 3k 12k 12k 20k 40k 30k 10pF 50 A BOTTOM PEAK K 1 x0 5 x2 x0 5 x2 PIN SEL APC SW TEB TE BAL TEB TE BAL RFGC AGC Gian VCTRLPIN VCC HiZ GND 50 0 50 12dB 6dB 0dB Normal mode 0dB Normal mode 0dB CD RW mode 12dB APC ON APC ON APC OFF LDO H TA2157FN X IC501 RF amp 2 Block diagram 1 Terminal layout 24 13 1 12 ...

Page 37: ... generation amp output pin Combining TEO signal RFRP signal with TC94A14F FA configures tracking search system RF signal peak detection output pin AGC FE TE amp gain change pin Reference voltage VRO output pin VRO 1 2VCC When VCC 3 3V Focus error signal generation amp output pin Focus error signal generation amp negative phase input pin Signal amp output pin for track count Combining RFRP signal a...

Page 38: ...CK DOUT SR I O1 I O2 OUT1 OUT2 VDD2 Crystal oscillator pin Non connect Chip enable input Serial data input Clock input Serial data output Register control pin I O ports I O ports Non connect Non connect Single power supply for REF frequency block O I I I O O I O I O Pin No Symbol I O Function 13 14 15 16 17 18 19 20 21 22 23 24 IFC VDD FMIN AMIN DGND FMCP VT AMCP VCC RF AGND XIN IF signal input Po...

Page 39: ...LCK DATA SFSY SBSY HSO UHSO PVDD3 O O O O O O O O O O I O Bit clock output pin 32fs 48fs or 64fs selectable by command L R channel clock output pin L for L channel and H for R channel Output polarity can be inverted by command Audio data output pin MSB first or LSB first selectable by command Digital data output pin Outputs up to double speed playback Correction flag output pin When set to H AOUT ...

Page 40: ...s input pin Focus equalizer output pin Tracking equalizer output pin Analog reference power supply voltage pin RF amplitude adjustment control signal output pin Tracking balance control signal output pin APC circuit ON OFF signal output pin At laser on high impedance with UHS L H output with UHS H Analog 3 3V power supply voltage pin Feed equalizer output pin Disc equalizer output pin Digital GND ...

Page 41: ... Co1 IC PST600M G W IC702 System reset 8 7 6 5 4 3 2 1 V B OUTPUT B INPUT B INPUT A INPUT A INPUT A OUTPUT V NJM4565M WE IC251 Ope amp VCC 22K ROUT Comparator Limiter AMP I V Detection crimp BPF RPM7138 V4 IC602 Remote control receiver ...

Page 42: ...KD SX787 VICTOR COMPANY OF JAPAN LIMITED MOBILE ELECTRONICS DIVISION PERSONAL MOBILE NETWORK BUSINESS UNIT 10 1 1Chome Ohwatari machi Maebashi city 371 8543 Japan No 49736 200204 ...

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