Daewoo NC-8011 Service Manual page 8

Trouble Shooting Guide
1
MP3/CD Section
3
1. Pick-up unit return
AC cord in
3
Yes
4
5
Power ON/OFF ON
6
Yes
7
Function to CD
8
and Initializing
Yes
9 9
CD open and disc insert
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
no
1. Check CN704
no
2. Check IC701 of 38pin and 39pin and 40pin
3. Check CN502,CW504.CN505
4. Check IC504 of 3pin:5.0V
5. Check Q501 collector:+3.3V
6. Check +3.3V (IC500 pin8/18/23/25/38/57/85
7. Check (IC502 SA5888 of 17pin and 18pin)SP+ 4.41V ,
8. Check SPDO +1.90V (IC500 M5675 pin123)
9. Check (IC502 SA5888 of 12pin and 11pin) SL- 3.81V,
10. Check CD Board(Around IC solder short,cold soldering )
no
Yes
no
no
Yes
(HQ500)
*Only NC-8011DE
1.Check F980，F981
2.Check PT903
3.Check RF982，RF983
4.Check CN902,CW902
5.Check CW401 of 4pin(main power on)
6.Check IC900 of 3pin:9V
7.Check Q902 collector:9V
8.Check IC704 of 2pin:3.3V
9.Check IC701 of 22pin:3.3V
*Only NC-8015/8016DE
1.Check F901
2.Check PT901
3.Check CN902 of 6pin:5V
4.Check CN902 of 7pin:(main power on)
5.Check IC911 of 3pin:9V.
6.Check IC704 of 2pin:3.3V
7.Check IC701 of 22pin:3.3V
41pin and 44pin.
/113/116/122)
SP- 3.41V
SL+ 3.91V
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
B
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