Daewoo NC-8913 Service Manual page 8

Trouble Shooting Guide
1
MP3/CD Section
3
1. Pick-up unit return
AC cord in
3
4
Power ON/OFF ON
5
6
Function to CD
and Initializing
7
8
CD open and disc insert
9 9
2. CD open and disc insert
CD open and disc
insert
CD close and cd on
3. Laser diode on
Laser diode on
Focusing operation
Yes
no
Yes
1. Check CN704
2. Check IC701 of 38pin and 39pin and 40pin
no
41pin and 44pin.
3. Check CN502,CW504.CN505
4. Check IC504 of 3pin:5.0V
Yes
5. Check Q501 collector:+3.3V
6. Check +3.3V (IC500 pin8/18/23/25/38/57/85/113/116/122)
7. Check (IC502 SA5888 of 17pin and 18pin)SP+ 4.41V ,
8. Check SPDO +1.90V (IC500 M5673 or M5675 pin123)
9. Check (IC502 SA5888 of 12pin and 11pin) SL- 3.81V,
SL+ 3.91V
10. Check CD Board(Around IC solder short,cold soldering )
no
Yes
no
no
Yes
B
(HQ500)
1.Check F980，F981
2.Check PT903
3.Check RF982，RF983
4.Check CN902,CN701
5.Check IC900 of 3pin:9V ,
IC704 of 2pin:3.3V
6.IC701 of 22pin:3.3V
SP- 3.41V
1. Check CN505 of 5pin.
2. Check IC502 SA5888 of 10pin
1. Check CN505 of 3pin.
2. Check IC502 SA5888 of 9pin
1. Check +1.8V LD on(HQ500 collector)
2. Check +2.1V (HQ500 base pin) >>>in case of play
E
C
STOP PLAY
C 0V 1.8V
B 3.3V 2.1V
E 3.3V 2.8V
1
3
3
4
5
6
7
8
9