Daewoo NC-8112E, Service Manual

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