Jvc-KDSX-875-Service-Manual(1) 电路图 维修手册.pdf

SERVICE MANUAL CD RECEIVER No.49620 Feb. 2001 COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD. KD-SX975 / KD-SX875 KD-SX975 / KD-SX875 Area Suffix U - Other Areas Contents Safety precaution Preventing static electricity Location of main parts Disassembly method Adjustment method 1-2 1-3 1-4 1-5 1-10 Flow of functional operation unit TOC read Maintenance of laser pickup Replacement of laser pickup Discription of major ICs 1-11 1-13 1-13 1-14 RadioFans.CN 收音机爱 好者资料库 KD-SX975 / KD-SX875 1-2 ! 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. Safety precaution ! Please use enough caution not to see the beam directly or touch it in case of an adjustment or operation check. RadioFans.CN 收音机爱 好者资料库 KD-SX975 / KD-SX875 1-3 Front bracket CD mechanism control board Damper bracket CD mechanism assy FD screw Feed motor assy FD gearPickup unit Preventing static electricity 1.Grounding to prevent damage by 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. 2.About the earth processing for the destruction prevention by static electricity Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as CD players. Be careful to use proper grounding in the area where repairs are being performed. 2-1 Ground the workbench Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate over it before placing the traverse unit (optical pickup) on it. 2-2 Ground yourself Use an anti-static wrist strap to release any static electricity built up in your body. 3. Handling the optical pickup 1. In order to maintain quality during transport 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 testers internal power source can easily destroy the laser diode. 4.Handling the traverse unit (optical pickup) 1. Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit. 2. Cut off the shorted part of the flexible cable using nippers, etc. after replacing the optical pickup. For specific details, refer to the replacement procedure in the text. Remove the anti-static pin when replacing the traverse unit. Be careful not to take too long a time when attaching it to the connector. 3. Handle the flexible cable carefully as it may break when subjected to strong force. 4. It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it Conductive material (conductive sheet) or iron plate (caption) Anti-static wrist strap Soldering Attention when traverse unit is decomposed 1.Solder is put up before the card wire is removed from connector on the CD substrate as shown in Figure. (When the wire is removed without putting up solder, the CD pick-up assembly might destroy.) 2.Please remove solder after connecting the card wire with when you install picking up in the substrate. *Please refer to Disassembly method in the text for pick-up and how to detach the substrate. RadioFans.CN 收音机爱 好者资料库 KD-SX975 / KD-SX875 1-4 Location of main parts Control unit Main unit CD mechanism Main board 16 pin connector Power IC Main board assembly Loading motor Damper Damper Damper Spindle motor Feed motor Optical pick up unit Mechanism relay board RCA jack Connector to front PCB Antenna jack Changer control connector Front PCB Display Tuner pack KD-SX975 / KD-SX875 1-5 Disassembly method Removing the front chassis (See Fig.1) 1. Remove two screws A and insert a screwdriver to the joints a on the side of the front chassis and two joints b on the right side, then detach the front chassis toward the front side. Removing the heat sink (See Fig.2 ) 1. Remove the three screws B attaching the heat sink on the left side of the body, and remove the heat sink. Removing the bottom cover (See Fig.3 ) 1. 2. Turn the body upside down. Insert a screwdriver to the two joints c and two joints d on both sides of the body and the joint e on the back of the body, then detach the bottom cover from the body. Fig.1 Fig.2 Front chassis b a a b Heat sink B B B Fig. 3 Regulator board ed c AA KD-SX975 / KD-SX875 1-6 Removing the main amplifier board assembly (See Fig.4 and 5) 1. 2. 3. 4. 5. Remove the front chassis. Remove the bottom cover. Remove the two screws C attaching the main amplifier board assembly on the bottom of the body. Remove the three screws D attaching the main amplifier board assembly on the back of the body. Disconnect connector CN501 on the main amplifier board assembly from the CD mechanism assembly. Removing the CD mechanism assembly (See Fig.6 ) 1. 2. 3. 4. Remove the front chassis. Remove the bottom cover. Remove the main amplifier board assembly. Remove the three screws E attaching the CD mechanism assembly from the top cover. Removing the control switch board (See Fig.7 and 8 ) 1. 2. 3. Remove the front chassis. Remove the four screws F attaching the rear cover on the back of the front panel unit. Remove the control switch board from the front panel unit. Fig.4 Fig. 5 D D CD mechanism assembly E E E Top cover Fig. 6 C C CN501Main amplifier board FF FF Fig. 7 Fig. 8 Control switch board KD-SX975 / KD-SX875 1-7 Unsolder the part a and b on the CD mechanism control board. Remove the stator fixing the CD mechanism control board and the damper bracket (To remove the stator smoothly, pick up the center part). Remove the screw A attaching the CD mechanism control board. Remove the CD mechanism control board in the direction of the arrow while releasing it from the two damper bracket slots d and the front bracket slot e. Disconnect the flexible wire from connector on the pickup unit. 1. 2. 3. 4. 5. Removing the CD mechanism control board (See Fig.1 and 2) Turn the FD gear in the direction of the arrow to move the entire pickup unit to the appropriate position where the flexible wire of the CD mechanism unit can be disconnected easily. (Refer to Fig.2) ATTENTION: Prior to performing the following procedure, remove the CD mechanism control board. Remove the two springs f attaching the CD mechanism assembly and the front bracket. Remove the two screws B and the front bracket while pulling the flame outward. Remove the belt and the screw C from the loading motor. 1. 2. 3. Removing the loading motor (See Fig.3 to 5) Fig.2 Fig.3 Fig.4 Shift the lock Flexible wire Pickup unit FD gear CD mechanism control board Loading motorFront bracket Front bracket Pull outward Pull outward Flame f B f B Fig.5 C Loading motor Belt Fig.1 Front bracket CD mechanism control board Damper bracket h c d b a DD D CD mechanism assembly A e h KD-SX975 / KD-SX875 1-8 Prior to performing the following procedure, remove the CD mechanism control board and the front bracket (loading motor). Remove the three screws D and the damper bracket. Raise the both sides fix arms and move the fix plates in the direction of the arrow to place the four shafts g as shown in Fig.8 and 9. Remove the CD mechanism assembly and the two springs h attaching the flame. Remove the two screws E and both sides rear damper brackets from the dampers. Detach the CD mechanism assembly from the left side to the right side. 1. 2. 3. 4. Removing the CD mechanism assembly (See Fig.1, 6 to 9) The CD mechanism assembly can be removed if only the rear damper bracket on the left side is removed. ATTENTION: Fig.6 Fig.7 Fig.8 Fig.9 Rear damper bracket Fix arm (R) Damper DD Damper bracket CD mechanism assembly Flameh h D D Fig.1 Front bracket CD mechanism control board Damper bracket h c d b a DD D CD mechanism assembly A e Fix plate (L) g g Rear damper bracket Fix arm (L) Damper E Fix plate(R) E g g h KD-SX975 / KD-SX875 1-9 Prior to performing the following procedure, remove the CD mechanism control board, the front bracket (loading motor) and the CD mechanism assembly. Remove the two screws F and the feed motor assembly. 1. Removing the feed motor assembly (See Fig.10) Prior to performing the following procedure, remove the CD mechanism control board, the front bracket (loading motor), the CD mechanism assembly and the feed motor assembly. Detach the FD gear part of the pickup unit upward. Then remove the pickup unit while pulling out the part i of the FD screw. 1. Remove the screw G attaching the nut push spring plate and the pickup mount nut from the pickup unit. Pull out the FD screw. 2. Removing the pickup unit (See Fig.10 and 11) When reattaching the pickup unit, reattach the part j of the pickup unit, then the part i of the FD screw. ATTENTION: Prior to performing the following procedure, remove the CD mechanism control board, the front bracket (loading motor), the CD mechanism assembly and the feed motor assembly. Turn up the CD mechanism assembly and remove the two springs k on both sides of the clamper arms. Open the clamper arm upward. Turn the turn table, and remove the two screws H and the spindle motor. 1. 2. Removing the spindle motor (See Fig.12 and 13) Fig.10 Fig.11 Fig.12 Fig.13 Spindle motor k k Pickup unit Part i FD screw Feed motor assembly FD gear Pickup unit Part j F Nut push spring plate Pickup mount nut Pickup unit FD screw G H H KD-SX975 / KD-SX875 1-10 Adjustment method Test instruments required adjustment 1.Digital oscilloscope (100MHz) 2.AM Standard signal generator 3.FM Standard signal generator 4.Stereo modulator 5.Electric voltmeter 6.Digital tester 7.Tracking offset meter 8.Test Disc JVC : CTS-1000 9.Extension cable for check Standard measuring conditions Power supply voltage DC14.4V(10.5 16V) Load impedance 4 (4 to 8 allowance) How to connect the extension cable for adjusting Standard volume position Balance and Bass Digital: 0) Flow of functional operation unit TOC read $83$82 $81 0V 6V 4V 2V OFF ON 5V Hi-Z FEO TA2109 14 2.2V $84 5V 0V 4V 0V 57 55 $84$86$ A200 5V 2.2V 0V 6V 3.2 2V Rough Servo AccelerationServo CLV 0.5 Sec 0.5 Sec 1 KD-SX975 / KD-SX875 1-12 Feed section Focus section Spindle section Tracking section Is the voltage output at IC521 pin 53 5V or 0V? Is the wiring for IC521 (90)(100) correct? Is 5V present at IC581 pin 20? Check CD 9V and 5V. Check the vicinity of IC521. Check the feed motor connection wiring. Is 6V or 2V present at IC581 6 and 7 ? Check IC581. Is 4V present at both sides of the feed motor? Check the feed motor. YES YES NOYESNO YES NO NO NO NO NO NO NO NO YES YES YES YES YES YES YES YESYES YES YES When the lens is moving: 4V Does the S-search waveform appear at IC581 pins 8 and 9? Check the circuits in the vicinity of IC501 pins 8,9and15. 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 IC581 pins 4 and 5? Check the spindle motor and its wiring Check the circuits in the vicinity of IC501 19 24 or the pickup Is 4V present at IC521 pins 55 ? Check IC501 and IC521. Check the vicinity of IC581. When the disc is rotated at first: Approx. 1.2V Is the tracking error signal output at IC501 12? Check IC521. Check the circuit in the vicinity of IC501 pins 212. Check the pickup and its connections. NO KD-SX975 / KD-SX875 1-13 Maintenance of laser pickup (1) Cleaning the pick up lens Before you replace the pick up,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, the following symptoms will appear. (1) The level of RF output (EFM output:ampli- tude of eye pattern) will be low. (3) Semi-fixed resistor on the APC PC board The semi-fixed resistor on the APC printed circuit board which is attached to the pickup is used to adjust the laser power. Since this adjustment should be performed to match the characteristics 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 pickup Turn off the power switch and,disconnect the power cord. Replace the pickup with a normal one.(Refer to Pickup Removal on the previous page) Plug the power cord in, and turn the power on. At this time, check that the laser emits for about 3seconds and the objective lens moves up and down. Note: Do not observe the laser beam directly. Play a disc. Check the eye-pattern at TP1. Finish. KD-SX975 / KD-SX875 1-14 UPD178078GF-543 (IC701): SYSTEM CPU 1.Terminal layout 2.Block diagram 1 30 80 51 100 81 31 50 8-bit TIMER/ EVENT COUNTER 1 8-bit TIMER/ EVENT COUNTER 0 WATCHDOG TIMER BASIC TIMER SERIAL INTERFACE 0 TO0/VTR-CONT TI00/POWER TI01/CD-ON TI50/MUTE TO50/NC TI51/STAGE TO51/NC SI0/SB0/SDA0/NC SO0/SB1/SDA1/VOL-DA SCK0/SCL/VOL-CLK SI1/JBUS-SI SO1/JBUS-SO SCK1/JBUS-SCK STB/NC BUSY/NC SI3/NC SO3/LCD-DA SCK3/SCL/LCD-CLK RESET CPU PERIPHERAL VOSC VCPU TXD0/LM1 RXD0/LM0 INTP0/NC INTP7/NC VM45/VTR-LOGIC REGOSC REGCPU GND0 GND1 BEEP0/BUZZER BUZ/NC RESET X1 X2 VDDPORT GNDPORT VDD SERIAL INTERFACE 1 SERIAL INTERFACE 3 UART0 8 INTERRUPT CONTROL BUZER OUTPUT SYSTEM CONTROL VOLTAGE REGULATOR PLL VOLTAGE REGULATOR PLL FREQUENCY COUNTER A/D CONVERTER PORT 13 PORT 12 PORT10 PORT 7 PORT 6 PORT 5 PORT 4 PORT 3 PD178078 :3Kbyte PD178076 :2Kbyte RAM PD178078 :60Kbyte PD178076 :48Kbyte ROM 78k/0 CPU CPRE 16-bit TIMER/ EVENT COUNTER PORT 0 PORT 1 PORT 2 8 8 8 8 8 8 8 8 8 8 3 5 NC,JBUS-INT,SW1, REMOCON,PS1,PS2, DETACH,NC KEY0,KEY1,KEY2,LEVEL, SM,OPEN.NC, JBUS-SI,JBUS-SO, JBUS-SCK,NC,VOL-DA, VOL-CLK VTR-LOGIC,VTR-CONT, POWER,CD-ON,MUTE, NC.BUZZER.NC NC NC,LCD-CE,SW2,SW3, SW4,RST-SW,ENC1,ENC2 MONO,SEEK/STOP, FM/AM.DIM IN.ANTENNA. TEL MUTING.STAGE1.STAGE2 NC,LCD-DA,LCD-CLK, JBUS-/O,LM0,LM1,BUCK, CCE SD/ST,NC,IFC BUS0,BUS1,BUS2,BUS3, RST NC AN10/KEY0 AN17/NC AMIFC/NC FMIFC/IFC EO1 EO0 VCOL VCOH VDDPLL GNDPLL IC GND2 AVDD AVSS Description of major ICs KD-SX975 / KD-SX875 1-15 UPD178078GF(1/2) Pin NO. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 - I I O O - - - O O - O O O - O I I I I I I I I I I - I I - - - - - - I - - I - - I - I - - O O - I NC JBUS-INT JBUS-SI JBUS-SO JBUS-SCK NC NC NC VOL-DA VOL-CLK NC LCD-DA LCD-CLK JBUS-I/O NC LCD-CE SW2 SW3 SW4 RST-SW ENC1 ENC2 KEY0 KEY1 KEY2 LEVEL AVDD SM OPEN NC NC AVSS REGCPU VD