Daewoo NC-8112E, Руководство по обслуживанию

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MP3/CD Section
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Trouble Shooting Guide
1
2
3
1. Pick-up unit return
2. CD open and disc insert
3. Laser diode on
STOP PLAY
C 0V 1.8V
B 3.3V 2.1V
(HQ500) E 3.3V 2.8V
CD open and disc
insert
AC cord in
Function to CD
and Initializing CD
no
1.Check CN704
2.Check IC707(MCU IC) of 23/24/25/26/27/28pin
3.Check IC705 of 5/12/13pin
4. Check CN502,CW504.CN505
5. Check IC504 of 3pin:5.0V
6. Check Q501 col3.3V
7. Check +3.3V (IC500 pin8/18/23/25/38/57/85
/113/116/122)
8. Check (IC502 SA5888 of 17pin and 18pin)SP+ 4.41V ,
SP- 3.41V
9. Check SPDO +1.90V (IC500 M5675 pin123)
10. Check (IC502 SA5888 of 12pin and 11pin) SL- 3.81V,
SL+ 3.91V
11. Check CD Board(Around IC solder short,cold soldering )
CD open and disc insert
Yes
Yes
CD close and cd on
Laser diode on
Yes
Focusing operation
no
1. Check +1.8V LD on(HQ500 collector)
2. Check +2.1V (HQ500 base pin) >>>in case of play
B
E
C
no
Yes
Yes
Power ON/OFF ON
no
1. Check CN505 of 5pin.
2. Check IC502 SA5888 of 10pin
no
1. Check CN505 of 3pin.
2. Check IC502 SA5888 of 9pin
1.Check CN700
2.Check IC701 of 33pin/40pin:3.3V
3..Check IC707(MCU IC) of 32pin:(main power on)