Daewoo NC-8112E Service Manual page 7

1
Trouble Shooting Guide
MP3/CD Section
2
4. Focusing operation
3 Focusing
operation
Yes
4
5. Spindle motor rotation
5
Spindle motor
rotation
6
Yes
7
6. Read in CD/MP3 disc operation
Yes
8
9
Read in CD/MP3
disc
Yes
7. Read in USB file and USB Encoding operation
Read in USB file
operation
Yes
USB Encoding
1. Check (IC502 SA5888 of 13pin and 14pin)
13pin 3.95V >>3.99V, pin18 3.72V >> 3.75V >>>
no
in case of play.
2. Check +1.58V(IC500 M5675 of 126pin).
1. Check SPDO +1.90V(IC500 M5675 of 123Pin)
no
in case of play。
2. Check (IC502 SA5888 of 12pin and 11pin) SL- 3.81V,
SL+ 3.91V.
3. Check (IC502 SA5888 of 17pin and 18pin)SP+ 4.41V ,
SP- 3.41V
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
no
5. Check IC504 of 3pin:5.0V
6. Check Q501 collector:+3.3V
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 )
1. Check IC500(M5675) of 52pin and 53pin.
2. Check CW507,CN707.
no
3. Check J702.
1. Check IC500 (M5675) of 52pin and 53pin.
2. Check CN502 7pin 8pin and 9pin.
3. Check IC500(M5675) 40pin,43pin input signal.
no
4. Check IC500(M5675) 33pin,36pin output signal.
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