Jvc-KDS-783-M-Service-Manual(1) 电路图 维修手册.pdf

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1、1-1 KD-S783M SERVICE MANUAL CD RECEIVER No.49764 Nov. 2002 COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD. KD-S783M KD-S783M Area Suffix UFChina Contents Safety precaution Preventing static electricity Disassembly method Adjustment method 1-2 1-3 1-4 1-11 Flow of functional operation unit TOC read Main

2、tenance of laser pickup Replacement of laser pickup Description of major ICs 1-12 1-14 1-14 1-1533 RadioFans.CN 收音机爱 好者资料库 1-2 KD-S783M ! 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.

3、 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 1-3 KD-S783M Front bracket CD mechanism control board Damper bracket CD mechanism assy FD screw Feed motor assy FD gear Pickup unit Preventing

4、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 repa

5、irs. 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 work

6、bench 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

7、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

8、 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 fl

9、exible 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 ca

10、ble 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 decompos

11、ed 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 subs

12、trate. *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 1-4 KD-S783M Press the eject button in the lower right part of the front panel. Remove the front panel assembly from the body. 1. Removing the front panel assembly (See Fig.1)

13、Prior to performing the following procedure, remove the front panel assembly. Release the four joint tabs a on both sides of the front chassis assembly and remove the front chassis assembly toward the front. 1. Removing the front chassis assembly (See Fig.2, 3) Disassembly method Fig.1 Fig.2 Fig.3 F

14、ront panel assembly Eject button Tab a Tab a Front chassis assembly Front chassis assembly Heat sinkTab a Tab a 1-5 KD-S783M Remove the three screws A on the left side of the body. 1. Removing the heat sink (See Fig.4) Prior to performing the following procedure, remove the front panel assembly, the

15、 front chassis assembly and the heat sink. Turn the body upside down. Insert a screwdriver to the two joints b and two joints c on both sides of the body and the joint d on the back of the body, then detach the bottom cover from the body. 1. 2. Removing the bottom cover (See Fig.5, 6) When disengagi

16、ng the joint d using a screwdriver, do not damage or break the board. CAUTION: Fig.4 Fig.5 Fig.6 Heat sink AA Joint b Joint c Joint d Joint c Joint b Joint d Bottom cover Bottom cover Rear panel Rear panel 1-6 KD-S783M Prior to performing the following procedure, remove the front panel assembly, the

17、 front chassis assembly, the heat sink and the bottom cover. Remove the screw B, the four screws C and the three screws D attaching the rear bracket on the back of the body. Remove the rear panel. Remove the two screws E attaching the main board on the bottom of the body. Disconnect connector CN501

18、on the main board in the direction of the arrow. 1. 2. Removing the main board (See Fig.7, 8) Prior to performing the following procedure, remove the front panel assembly, the front chassis assembly, the heat sink, the bottom cover and the main board. Remove the three screws F attaching the cassette

19、 mechanism section on the back of the top chassis. 1. Removing the CD mechanism section (See Fig.9) Fig.7 Fig.8 Fig.9 Main board E E CN501 CD mechanism section F F Top chassis F Rear panel B D D D CCC 1-7 KD-S783M Prior to performing the following procedure, remove the front panel assembly. Remove t

20、he four screws G attaching the rear cover on the back of the front panel assembly. Unjoint the eleven joints e with the front panel and the rear cover. Remove the control switch board on the back of the front panel. 1. 2. 3. Removing the control switch board (See Fig.10 12) Fig.10 Fig.11 Fig.12 G GG

21、 G Rear cover Joint e Front panel Rear cover Front panel Control switch board Joint e Joint e Joint e 1-8 KD-S783M 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 c

22、enter 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.

23、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 f

24、ollowing 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

25、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

26、 b a DD D CD mechanism assembly A e h 1-9 KD-S783M 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

27、 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. Remo

28、ving 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.5 Front bracket

29、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 1-10 KD-S783M Prior to performing the following procedure, remove the CD mechanism control board, the front bracket (loading motor) and t

30、he 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

31、. 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 1

32、1) 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

33、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

34、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 1-11 KD-S783M Adjustment method Test instruments required for adjustment 1. Digital oscilloscope (100MHz) 2. AM Standard signal generator 3. FM Standard signal gene

35、rator 4. Stereo modulator 5. Electric voltmeter 6. Digital tester 7. Tracking offset meter 8. Test Disc JVC :CTS-1000 9. Extension cable for check EXTGS004-26P 1 Standard measuring conditions Power supply voltage DC14.4V(10.516V) Load impedance 4 (2 Speakers connection) Line oout impeadance 20k Outp

36、ut Level Line out 2.0V (Vol. MAX) How to connect the extension cable for adjusting 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.The loss of 6dB need not be considered since direct reading of figures are ap

37、plied in this working standard. Standard volume position Balance and Bass Digital: 0) RF signal Flow of functional operation until TOC read When the pickup correctly moves to the inner area of the disc TERMINAL Microprocessor commands FMO TC9462 53 FEED MOTOR +TERMINAL IC581 5 REST SW When the disc

38、correctly rotates Tracking Servo Loop ON Servo CLV Rough Servo AccelerationAccelerationAcceleration Microprocessor commands Spindle motor (-) IC581 7 0.5 Sec 0.5 Sec 1-13 KD-S783M Feed Section Focus Section Tracking Section Spindle Section Is the voltage output at IC521 pin 53 5V or 0V? Check the fe

39、ed motor. Is 4V present at both sides of the feed motor? Is the wiring for IC521 (90) (100) correct? Check IC581. Is 6V or 2V present at IC581 5 and 6? Is 5V present at IC581 pin 11? Check the feed motor connection wiring. Check the vicinity of IC521. Check CD 9V and 5V. YES YES YES NONO NO NO NO YE

40、S YES When the lens is moving: Check the circuits in the vicinity of IC581 pins 15 18. Check the pickup and its connections. NO YES YES YES Does the S-search waveform appear at IC581 pins 17 and 18? Is the disk rotated? Does the RF signal appear at TP1? Is 4V present at IC581 pins 7 and 8 ? Check th

41、e spindle motor and its wiring. Is 4V present at IC521 pin 55 ? Check the vicinity of IC581. Check IC501 and IC521. YES NO NO NO NONO YES YES YES Check the circuits in the vicinity of IC501 19 24 or the pickup Is the RF waveform at TP1 distorted? Proceed to the Tracking section When the disc is rota

42、ted at first: Check the circuit in the vicinity of IC501 pins 2 12. Check IC521. Check the pickup and its connections. YESYES YES Is the tracking error signal output at IC501 12? Approx. 1.2 V 4V 1-14 KD-S783M Maintenance of laser pickup (1) Cleaning the pick up lens Before you replace the pick up,

43、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. Replacement of laser pickup Is RF output 1.0 0.

44、35Vp-p? Replace it. NO YES O.K (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

45、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 curren

46、t. Turn off the power switch and,disconnect the power cord from the ac outlet. 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

47、and down. Note: Do not observe the laser beam directly. Play a disc. Check the eye-pattern at TP1. Finish. 1-15 KD-S783M Description of major ICs 1 24 2 15 16 13 3 4 5 6 78910111214172123 18 19 22 20 Buff. ON/OFF OSC circuit AMP AMP AMP Reference Counter Phase Comparator Prescaler 4-bit Swallow coun

48、ter 12-bit Programmable counter Constant power supply voltage AM CP. switch switch REG. vt FM cp + - + - a-gndvccd-gndvdd vdd2out-2out-1I/O -2I/O -1SL osc XO XI FM VCO AMVCO IFC CE DIN DOUT DIMM 20-bit BINARY COUNTER Serial Interface Resistor 1 Resistor 2 22-bit 40bit shift register I/O PORT OUTPUT

49、PORT Vdd Vcc TB2118F-X (IC31) : PLL 1. Terminal layout 2. Block diagram Pin No. Symbol I/OFunction 1 2 3 4 5 6 7 8 9 10 11 12 XOUT OSC CE DI CK DOUT SR I/01 I/02 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 - - -