Jvc KWXC 828 Service Manual

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1-2 KW-XC828 ! 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. Safety precaution ! CAUTION Please use enough caution not to see the beam directly or touch it in case of an adjustment or operation check.

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1-3 KW-XC828 Remove the four screws A on both sides of the body. Release four joints a on both sides of the body using a screwdriver and remove the front panel assembly toward the front. The connector which connects the front panel assembly with the rear section comes off. 1. 2. Disassembly method Removing the front panel assembly (See Fig.1 ~ 3) When reassembling, make sure that connector CN501 on the front panel assembly is securely connected to CN701 on the main board (See Fig.3). CAUTION: A A A A CN701 CN501 Joint a Joint a Front panel assembly Fig.1 Fig.2 Joint a Joint a Front panel assembly Fig.3 Front panel assembly

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1-20 KW-XC828 Check the mode is set to EJECT. Push down the front part of the cassette holder and move in the direction of the arrow to release the joint c. Move the rear part of the cassette hanger assembly in the direction of the arrow to release it from the two joint bosses d. Release the holder stabilizer spring from the hooks e and f, then pull out from the cassette hanger assembly. Bring up the rear side of the cassette hanger assembly to release the joint g and h. Pull out the cassette catch from the cassette hanger assembly. 1. 2. 3. 4. 5. Removing the cassette hanger assembly / cassette holder (See Fig.4 to 7) Fig.4 Fig.5 Fig.7 Fig.6 Cassette holder assembly Cassette holder assembly Side bracket Joints c Cassette holder assembly Cassette hanger assembly Cassette hanger assemblyCassette hanger assembly Boss d Boss d Cassette hanger assembly Cassette stabilizer spring Hook f Hook hHook e Hook g Cassette holder assembly Cassette catch

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1-33 KW-XC828 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. the following symptoms will appear.. (1) The level of RF output (EFM output:amplitude of eye patterrn) 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? YESNO O.KReplace it. Replacement of laser pickup Turn of 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.

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KW-XC828 3-20 Item Parts number Parts name Ar ea Electrical parts list (CD mecha control board) Remarks Block No. 03 A R 626 NRSA63J-474X MG RESISTOR R 627 NRSA63J-103X MG RESISTOR R 628 NRSA63J-225X MG RESISTORR 629 NRSA63J-103X MG RESISTOR R 630 NRSA63J-101X MG RESISTOR R 631 NRSA63J-101X MG RESISTORR 632 NRSA63J-0R0X MG RESISTOR R 633 NRSA63J-0R0X MG RESISTOR R 634 NRSA63J-0R0X MG RESISTORR 635 NRSA63J-101X MG RESISTOR R 636 NRSA63J-101X MG RESISTOR R 637 NRSA63J-105X MG RESISTOR R 638 NRSA63J-472X MG RESISTOR R 639 NRSA63J-472X MG RESISTOR R 640 NRSA63J-472X MG RESISTOR R 641 NRSA63J-472X MG RESISTOR R 642 NRSA63J-103X MG RESISTOR R 651 NRSA63J-104X MG RESISTOR R 652 NRSA63J-474X MG RESISTOR R 653 NRSA63J-474X MG RESISTOR R 654 NRSA63J-470X MG RESISTOR R 655 NRSA63J-0R0X MG RESISTOR R 656 NRSA63J-0R0X MG RESISTOR R 657 NRSA63J-0R0X MG RESISTORR 658 NRSA63J-474X MG RESISTOR R 659 NRSA63J-474X MG RESISTOR R 660 NRSA63J-474X MG RESISTORR 661 NRSA63J-474X MG RESISTOR R 662 NRSA63J-474X MG RESISTOR R 663 NRSA63J-474X MG RESISTORR 664 NRSA63J-474X MG RESISTOR R 665 NRSA63J-474X MG RESISTOR R 666 NRSA63J-474X MG RESISTORR 667 NRSA63J-474X MG RESISTOR R 668 NRSA63J-0R0X MG RESISTOR R 669 NRSA63J-474X MG RESISTOR R 670 NRSA63J-474X MG RESISTOR R 671 NRSA63J-474X MG RESISTOR R 672 NRSA63J-474X MG RESISTOR R 673 NRSA63J-474X MG RESISTOR R 674 NRSA63J-331X MG RESISTOR R 675 NRSA63J-331X MG RESISTOR R 677 NRSA63J-105X MG RESISTOR R 681 NRSA63J-682X MG RESISTOR R 682 NRSA63J-682X MG RESISTOR R 683 NRSA63J-472X MG RESISTOR R 684 NRSA63J-153X MG RESISTOR R 685 NRSA63J-333X MG RESISTORR 686 NRSA63J-822X MG RESISTOR R 687 NRSA63J-0R0X MG RESISTOR R 688 NRSA63J-303X MG RESISTORR 689 NRSA63J-223X MG RESISTOR TH501 NAD0022-103X N THERMISTOR X 501 NAX0430-001X CRYSTALX 571 NAX0375-001X CRYSTAL