JVC KD-SX8250 Service Manual

Cd receiver

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Service manual (42 pages)

Schematic diagrams (6 pages)

Instructions manual (42 pages)

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Page 1 KD-SX8250/KD-SX780 3 7 63 1515 0 SERVICE MANUAL CD RECEIVER KD-SX8250/KD-SX780 KD-SX8250 SOUND SOURCE KD-SX780 L 13942296513 SOUND SOURCE COMPACT DIGITAL AUDIO Difference point KD-SX8250 KD-SX780 SUBWOOFER LINE-OUT Area Suffix DIMMER Northern America FINDER SILVER BLACK Contents Safety precaution...
Page 2: Safety Precaution
KD-SX8250/KD-SX780 3 7 63 1515 0 Safety precaution ! CAUTION Burrs formed during molding may be left over on some parts of the chassis. Therefore, pay attention to such burrs in the case of preforming repair of this system.
Page 3: Preventing Static Electricity
KD-SX8250/KD-SX780 3 7 63 1515 0 Preventing static electricity Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laser diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs.
Page 4: Disassembly Method
KD-SX8250/KD-SX780 3 7 63 1515 0 Disassembly method Removing the front panel unit (See Fig.1) Press the release switch and remove the front panel unit in the direction of the arrow. Front panel unit Fig.1 Removing the front chassis (See Fig.2 to 4)
Page 5 KD-SX8250/KD-SX780 3 7 63 1515 0 Removing the bottom cover (See Fig.6) Joints d Prior to performing the following procedure, remove Bottom cover the front chassis and the heat sink. Turn the body upside down. Insert a screwdriver to the two joints d and two joints...
Page 6 KD-SX8250/KD-SX780 3 7 63 1515 0 Removing the CD mechanism assembly CD mechanism assembly (See Fig.9) Prior to performing the following procedure, remove the front chassis, the heat sink, bottom cover and the main amplifier board assembly. Remove the three screws F attaching the cassette mechanism assembly from the top cover.
Page 7: Removing The Top Cover
KD-SX8250/KD-SX780 3 7 63 1515 0 Removing the top cover (See Fig.1 and 2) Remove the two screws A on each side of the body. Top cover Joints a Lift the front side of the top cover and move the cover backward to release the two joints a.
Page 8 KD-SX8250/KD-SX780 3 7 63 1515 0 Removing the DET switch (See Fig.3 and 6) Extend the two tabs c of the feed sw. holder and pull out the switch. DET switch Unsolder the DET switch wire if necessary. Connector board Removing the chassis unit (See Fig.7 and 8)
Page 9 KD-SX8250/KD-SX780 3 7 63 1515 0 Removing the clamper assembly (See Fig.9 and 10) Prior to performing the following procedure, remove Clamper arm the top cover. spring Remove the clamper arm spring. Move the clamper assembly in the direction of the arrow to release the two joints d.
Page 10: Removing The Pickup Unit
KD-SX8250/KD-SX780 3 7 63 1515 0 Feed sw. holder Removing the pickup unit (See Fig.13 to 17) Joint f Prior to performing the following procedure, remove the top cover, the connector board and the chassis unit. Remove the screw D and pull out the pu.
Page 11 KD-SX8250/KD-SX780 3 7 63 1515 0 Removing the trigger arm (See Fig.18 and 19) Joint k Prior to performing the following procedure, remove the top cover, the connector board and the clamper unit. Trigger arm Turn the trigger arm in the direction of the arrow to release the joint k and pull out upward.
Page 12 KD-SX8250/KD-SX780 3 7 63 1515 0 Joint a' Link plate Joint r Removing the select arm (L) / select lock Select arm (L) Joint z Select arm (R) arm (See Fig.21 and 22) Select lock arm Prior to performing the following procedure, remove the top plate assembly.
Page 13 KD-SX8250/KD-SX780 3 7 63 1515 0 Joint a' Link plate Joint r Removing the select arm (R) / link plate Select arm (L) Joint z Select arm (R) (See Fig.21 and 22) Select lock arm Prior to performing the following procedure, remove the top plate assembly.
Page 14 KD-SX8250/KD-SX780 3 7 63 1515 0 Roller guide Removing the loading roller assembly Washer (See Fig.27 to 29) Loading roller assembly Prior to performing the following procedure, remove the clamper assembly and the top plate assembly. Roller guide Push inward the loading roller assembly on the gear side and detach it upward from the slot of the joint d’...
Page 15 KD-SX8250/KD-SX780 3 7 63 1515 0 Removing the loading gear (5), (6) and Loading gear bracket (7) (See Fig.31 and 32) Loading gear (6) Prior to performing the following procedure, remove the top cover, the chassis unit and the top plate assembly.
Page 16 KD-SX8250/KD-SX780 3 7 63 1515 0 Removing the gears (See Fig.33 to 36) Prior to performing the following procedure, remove the top cover, the chassis unit, the top plate assembly and the pickup unit. Slot j' Pull out the feed gear.
Page 17 KD-SX8250/KD-SX780 3 7 63 1515 0 Removing the turn table / spindle motor Turn table (See Fig.37 and 38) Prior to performing the following procedure, remove the top cover, the connector assembly and the chassis / clamper assembly. Remove the two screws K...
Page 18: Adjustment Method
Power supply voltage DC 14.4V(11V to 16V allowance) Load impedance 4 (4 to 8 allowance) Line-out Level/Impedance KD-SX8250 : 4.0 V/20k load(full scale) L 13942296513 KD-SX780 : 2.0 V/20k load(full scale) Output impedance : 1k How to connect the extension cable for adjusting...
Page 19: Flow Of Functional Operation Unit Toc Read
KD-SX8250/KD-SX780 3 7 63 1515 0 Flow of functional operation unit TOC read Power ON When the laser diode correctly Set Function CD When the pickup correctly moves emits to the inner area of the disc Microprocessor $82 $81...
Page 20: Feed Section
KD-SX8250/KD-SX780 3 7 63 1515 0 Feed section Is the voltage output at Is the wiring for IC521 Is 3.3V present at IC561 IC521 pin "40" 5V or 0V? (56)~(64) correct? pin "20"? Check CD 8V Check the vicinity of and 5V.
Page 21: Maintenance Of Laser Pickup
KD-SX8250/KD-SX780 3 7 63 1515 0 Maintenance of laser pickup (1) Cleaning the pickup lens Before you replace the pickup,please try to clean the lens with a alcohol soaked cotton swab. (2) Life of the laser diode When the life of the laser diode has expired.
Page 22: Description Of Major Ics
KD-SX8250/KD-SX780 3 7 63 1515 0 Description of major ICs UPD784215AGC143(IC701):MAIN CPU 1.Pin layout 2.Block diagram INTP2/NMI RxD1/SI1 PROGRAMMABEL UART/IOE1 TxD1/SO1 INTP0,INTP1 INTERRUPT BAUD-RATE ASCK1/SCK1 INTP3-INTP6 CONTROLLER GENERATOR RxD2/SI2 TI00 UART/IOE2 TIMER/COUNTER TxD2/SO2 TI01 BAUD-RATE (16 BITS) ASCK2/SCK2 GENERATOR...
Page 23 KD-SX8250/KD-SX780 3 7 63 1515 0 UPD784215AGC143(1/2) Pin No. Symbol Function Non connected Non connected Detection switch of CD mechanism CD mecha position setting SW Loading motor control signal output MOTOR SEL Loading /feed motor selecting output Non connected...
Page 24 KD-SX8250/KD-SX780 3 7 63 1515 0 UPD784215AGC143(2/2) Symbol Function Pin No. Non connected Non connected SD/ST Station detector and stereo signal input. It is H and there is a bureau.It is L and a stereo. Non connected MONO Monaural ON/OFF switch output.
Page 25 KD-SX8250/KD-SX780 3 7 63 1515 0 BA3220FV-X (IC341,IC441) : Line out amp 1.Pin layout 3220 2.Block diagram OUTL OUTR RGND LGND L 13942296513 REFR REFL FILTER u163 1-25 http://www.xiaoyu163.com...
Page 26 KD-SX8250/KD-SX780 3 7 63 1515 0 HA13164 (IC961) : Regulator 1.Pin layout 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 2.Block diagram Surge Protector BIAS L 13942296513 UNIT R: note1) TAB (header of IC) connected to GND 3.Pin function...
Page 27 KD-SX8250/KD-SX780 3 7 63 1515 0 HD74HC126FP-X (IC771) : Buffer 1.Terminal layout 3.Pin function Input Output Note: H : High L : Low X : H and L Z : H.L.X 2.Block diagram Output Input L 13942296513 Output Sample as Load Circuit 1...
Page 28 KD-SX8250/KD-SX780 3 7 63 1515 0 LA47503(IC351):Power amp. 1.Terminal layout Protective circuit L 13942296513 Stand by Switch Ripple Mute Filter circuit protective circuit Muting & u163 On Time Control Circuit 1-28 http://www.xiaoyu163.com...
Page 29 KD-SX8250/KD-SX780 3 7 63 1515 0 2.Terminal layout 3.Pin function LA47503 Pin No. Symbol Function Header of IC AC CONT1 Power GND GND1 Outpur(-) for front Rch OUTFR- Stand by input STBY Output (+) for front Rch OUTFR+ Power input...
Page 30: Terminal Layout
KD-SX8250/KD-SX780 3 7 63 1515 0 LA6579H-X(IC561):CD driver 1.Terminal layout VN1_SW [H]:OP-AMP_A [L]:OP-AMP_B Signal system It is ON/OF as for all output H:ON MUTE L:OFF It is ON/OF Power sytem as for all output L 13942296513 Power sytem GND...
Page 31 KD-SX8250/KD-SX780 3 7 63 1515 0 LA6579H Symbol Description VIN1-A CH1 input AMP_A reversing input. VIN1+A CH1 input AMP_A non-reversing input. VCCP1 CH1 and CH2 power steps power supply. VO1+ CH1 output terminal (+) VO1- CH1 output terminal (-)
Page 32 KD-SX8250/KD-SX780 3 7 63 1515 0 LC75344M-X(IC252):Sub woofer 1.Terminal layout 2.Block diagram L 13942296513 3.Pin function Symbol Function Input signal connections LOUT Volume output 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.
Page 33 KD-SX8250/KD-SX780 3 7 63 1515 0 LC75412W(IC301):E.VOLUME 1.Terminal layout & block daiagram LVref Multiplexer ZERO CROSSDET LVref CONTROL INTERFACE LOGIC CIRCUITVA CIRCUIT RVref Multiplexer ZERO CROSSDET NO SIGNAL TIMMER RVref L 13942296513 2.Function Symbol Function Pin No. Single end input terminal...
Page 34 KD-SX8250/KD-SX780 3 7 63 1515 0 LC75412W Symbol Function Pin No. LF1C1 The capacitor connection terminal of the filter composition for the F1 stap of the equalizer. LF1C2 LF1C1(RF1C1)~LF1C2(RF1C2),Connect the capacitor for LF1C2(RF1C2)~LF1C3(RF1C3). LF1C3 RF1C1 RF1C2 RF1C3 LF3C1 Capacitor connection terminal of filter composition for F3 strap of equalizer.
Page 35 KD-SX8250/KD-SX780 3 7 63 1515 0 LC75873NW(IC601):LCD Driver 1.Pin layout 2.Block diagram VDD1 COMON SEGMENT DRIVER DRIVER VDD2 CLOCK SHIFT REGISTOR GENERATOR ADDRESS DETECTOR 3.Pin function Pin No. Pin name Description Segment outouts for displaying the display data DIMMER,S1 79,80 transferred by serial data input.
Page 36: Block Diagram
KD-SX8250/KD-SX780 3 7 63 1515 0 TA2157FN-X(IC501):RF amp 1.Terminal layout 2.Block diagram PEAK 50 A L 13942296513 BOTTOM PEAK 1.75k 240k 15pF x0.5 240k 15pF x0.5 180k 40pF RFGC (APC SW) (TE BAL) (AGC Gian) (TE BAL) VCTRLPIN Normal mode...
Page 37 KD-SX8250/KD-SX780 3 7 63 1515 0 3.Pin function TA2175FN-X Pin No. Symbol Function 3.3V power supply pin Main-beam amp input pin Main-beam amp input pin Sub-beam amp input pin Sub-beam amp input pin Monitor photo diode amp input pin...
Page 38 KD-SX8250/KD-SX780 3 7 63 1515 0 TB2118F-X (IC21) : PLL 1.Terminal Layout 2.Block diagram Constant power supply voltage Buff. ON/OFF AM CP. Phase OSC circuit Reference Counter Comparator switch FM IN 4-bit Prescaler Swallow counter 12-bit AMIN Programmable counter...
Page 39 KD-SX8250/KD-SX780 3 7 63 1515 0 TC94A14FA(IC521):DSP&DAC 1.Terminal layout & block daiagram Clock generator 1-bit Servo control Digital equalizer Address automatic circuit adjustment circuit Data CLV servo slicer 16 k Synchronous guarantee L 13942296513 decoder Audio out Digital circuit...
Page 40 KD-SX8250/KD-SX780 3 7 63 1515 0 TC94A14FA Symbol Description EFM and PLCK phase difference signal output pin. TMAX TMAX detection result output pin. TMAX Detection Result TMAX Output Longer than fixed period "PV " Within fixed period "HiZ" "AV "...
Page 41 KD-SX8250/KD-SX780 3 7 63 1515 0 IC-PST600M/G/-W (IC702) : System reset NJM4565M-WE (IC251) : Ope. amp A OUTPUT B OUTPUT A INPUT L 13942296513 A INPUT B INPUT B INPUT RPM7138-V4(IC602):Remote control receiver Comparator Limiter Detection crimp u163 1-41...
Page 42 KD-SX8250/KD-SX780 3 7 63 1515 0 L 13942296513 u163 VICTOR COMPANY OF JAPAN, LIMITED MOBILE ELECTRONICS DIVISION PERSONAL & MOBILE NETWORK BUSINESS UNIT. 10-1,1Chome,Ohwatari-machi,Maebashi-city,371-8543,Japan 200202 (No.49690) http://www.xiaoyu163.com...
Page 43 KD-SX8250/KD-SX780 3 7 6 3 1 5 1 5 0 CD Mechanism ENC 1,2 VOLUME JOG CD PICKUP UNIT MECHA.SWITCH SYSTEM EN601 CONTROLLER SW1~2 IC701 REMOCON SPINDLE/FEED REMOTE CONTROL VOL CL MOTOR RECEIVER VOL DA SPINDLE IC602 FEED TRACKING...
Page 44 KD-SX8250/KD-SX780 3 7 63 1515 0 < M E M O > L 13942296513 u163 http://www.xiaoyu163.com...
Page 45: Standard Schematic Diagrams
KD-SX8250/KD-SX780 Standard schematic diagrams 3 7 6 3 1 5 1 5 0 Receiver & System control section D951 R952 C952 0.047 1SS133 C951 1/50 IC351 LA47503 QAU0258-001 C351 2.2/50 R351 4.7u R352 R324 R201 C203 1/50 C352 R101 R323 2.2/50...
Page 46 KD-SX8250/KD-SX780 KD-SX8250/KD-SX780 3 7 6 3 1 5 1 5 0 Mecha control circuit section R564 R562 8.2k R592 R595 FEED- R563 4.7k C592 R594 R591 C593 CD.L R593 C561 120p SPD+ FEED+ 4.7/25 R566 47/6.3 SPD- 8.2k( 1/10W)
Page 47 KD-SX8250/KD-SX780 3 7 6 3 1 5 1 5 0 LCD driver & Operation switch section LCD1 IC602 RPM7138-V4 ACC5V CN601 R660 QNZ0006-001 LCD1 QLD0217-001 1 3 9 4 2 2 9 6 5 1 3 R661 EN601 ENC1...
Page 48: Printed Circuit Boards
KD-SX8250/KD-SX780 KD-SX8250/KD-SX780 3 7 6 3 1 5 1 5 0 Printed circuit boards Main board(Forward side) Main board(Reverse side) IC961 D962 C964 C964 D963 C914 C965 J931 C371 C963 C960 C960 R966 C372 C914 C965 D961 D960 C966...
Page 49: Parts List
KD-SX8250/KD-SX780 3 7 63 1515 0 PARTS LIST [ KD-SX8250 ] [ KD-SX780] * All printed circuit boards and its assemblies are not available as service parts. Area suffix J -------------- Northern America L 13942296513 - Contents - 3- 2 Exploded view of general assembly and parts list (Block No.M1)
Page 50: Exploded View Of General Assembly And Parts List
KD-SX8250/KD-SX780 3 7 63 1515 0 Exploded view of general assembly and parts list Block No. L 13942296513 u163 http://www.xiaoyu163.com...
Page 51 2 CHASSIS+MAIN PWB QYSDST2612Z SCREW 2 SIDE PANEL+IC BKT QYSDSF2006M SCREW 2 F.CHASSIS+CONECTOR GE10049-003A FRONT CHASSIS 1 KD-SX780 GE10049-004A FRONT CHASSIS 1 KD-SX8250 MINI SCREW QYSPSPT2020Z LIGHT LENS GE30381-001A VKZ4777-001 MINI SCREW 1 L.LENS+F.CHASSIS GE30378-001A OPEN LEVER FSKS3015-001 LOCK LEVER(O.L)
Page 52 1 FOR EJECT BUTTON GE30116-001A DETACH BUTTON VKW3001-330 COMP.SPRING 1 FOR DETACH BUTTON REAR COVER 1 KD-SX780 GE10042-001A GE10042-002A REAR COVER 1 KD-SX8250 FSYH4036-078 SHEET 1 REAR COVER VKZ4777-001 MINI SCREW 3 FRONT+REAR VKZ4777-001 MINI SCREW 1 RIM COVER GE30355-002A...
Page 53: Cd Mechanism Assembly And Parts List
KD-SX8250/KD-SX780 3 7 63 1515 0 CD mechanism assembly and parts list Block No. TN-2001-1001 Grease TNG-87 L 13942296513 u163 http://www.xiaoyu163.com...
Page 54 KD-SX8250/KD-SX780 3 7 63 1515 0 Parts list (CD mechanism) Block No. MBMM Item Description Parts number Parts name Q'ty Area 30320101T FRAME 30320102T TOP COVER 30320109T DAMPER F 30320110T DAMPER R 303205501T CHASSIS RIVET A CHANGE P. RVT A...
Page 55 KD-SX8250/KD-SX780 3 7 63 1515 0 Parts list (CD mechanism) Block No. MBMM Item Description Parts number Parts name Q'ty Area 30321103T LOADING GEAR 3 30321104T LOADING GEAR 4 30321105T LOADING GEAR 5 30321106T LOADING GEAR 6 30321107T LOADING GEAR 7...
Page 56 KD-SX8250/KD-SX780 3 7 63 1515 0 Electrical parts list (Main board) Block No. 01 Item Parts number Parts name Remarks Area Item Parts number Parts name Remarks Area BZ871 QAN0002-001Z BUZZER C 323 QERF1CM-226Z E CAPACITOR 22MF 20% 16V...
Page 57 KD-SX8250/KD-SX780 3 7 63 1515 0 Electrical parts list (Main board) Block No. 01 Item Parts number Parts name Remarks Area Item Parts number Parts name Remarks Area C 523 NDC31HJ-470X C CAPACITOR C 715 NCS31HJ-101X C CAPACITOR C 524...
Page 58 KD-SX8250/KD-SX780 3 7 63 1515 0 Electrical parts list (Main board) Block No. 01 Item Parts number Parts name Remarks Area Item Parts number Parts name Remarks Area D 471 1SS355-X DIODE Q 351 UN2211-X TRANSISTOR D 472 1SS355-X...
Page 59 KD-SX8250/KD-SX780 3 7 63 1515 0 Electrical parts list (Main board) Block No. 01 Item Parts number Parts name Remarks Area Item Parts number Parts name Remarks Area R 269 NRSA63J-181X MG RESISTOR KD-SX8250 R 503 NRSA63J-823X MG RESISTOR...
Page 60 KD-SX8250/KD-SX780 3 7 63 1515 0 Electrical parts list (Main board) Block No. 01 Item Parts number Parts name Remarks Area Item Parts number Parts name Remarks Area R 685 NRSA63J-105X MG RESISTOR R 767 NRSA63J-473X MG RESISTOR R 686...
Page 61 KD-SX8250/KD-SX780 3 7 63 1515 0 Electrical parts list (Front board) Block No. 02 Item Parts number Parts name Remarks Area Item Parts number Parts name Remarks Area C 601 NBE20JM-475X TS E CAPACITOR R 622 NRSA02J-122X MG RESISTOR...
Page 62: Packing Materials And Accessories Parts List
KD-SX8250/KD-SX780 3 7 63 1515 0 Packing materials and accessories parts list Block No. Block No. A1~A8 L 13942296513 KIT:A9~A13 u163 3-14 http://www.xiaoyu163.com...
Page 63 1 FOR SCREW KIT FSYH4036-068 SHEET 1 MIRAMA SHEET QPA01003003 POLY BAG 1 FOR HARD CASE QPC03004315P POLY BAG 1 FOR SET PACKING CASE 1 KD-SX8250 GE30407-024A PACKING CASE 1 KD-SX780 GE30407-026A GE10047-001A ESP CUSHION Parts list (Accessories) Block No. M5MM Item Description...

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JVC KD-SX8250 Service Manual

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