3-13
ONE POINT REPAIR GUIDE
NO BOOTING IN CD/USB FUNCTION
After you turn on power key and displayed message in the following order (HELLO
VOL XX
CD or USB) on VFD, it will not display other message on VFD, and it will not boot-up normally.
8-5. DSP (IC501)
8-5-1. Solution
Please check and replace IC501 on MAIN board.
8-5-2. How to troubleshoot (Countermeasure)
1) After check them by Previous pages about NO Booting, if the set is still no booting,
Check soldering status of IC501.
2) If below bootstrap waveform doesn’t come out, then replace IC501(DSP IC).
8-5-3. Service hint (Any picture / Remark)
R594
PGPB12
(Yellow)
R598
PAD19
(Green)
R597
PAD20
(Pink)
< Bootstrap waveform >
< MAIN board top view >
IC501
IC501
Содержание OM7550
Страница 13: ...1 12 ...
Страница 16: ...2 3 Figure 3 Step 3 Seperate Cover_Side to out direction ...
Страница 17: ...2 4 ...
Страница 21: ...2 10 ...
Страница 58: ...3 37 3 SERVO IC401 X XI XO Fig 3 2 CD 16M IC401 pin31 Fig 3 1 Crystal 16 9344 MHz X400 11 10 12 10 11 12 ...
Страница 79: ...3 75 3 76 3 MAIN VFD RMC1 P C BOARD TOP VIEW ...
Страница 80: ...3 77 3 78 4 MAIN VFD RMC1 P C BOARD BOTTOM VIEW ...
Страница 81: ...3 79 3 80 5 FRONT P C BOARD TOP VIEW 6 FRONT P C BOARD BOTTOM VIEW ...
Страница 82: ...3 81 3 82 7 TOP VOLUME_FR1 P C BOARD TOP VIEW ...
Страница 83: ...3 83 3 84 8 TOP VOLUME_FR1 P C BOARD BOTTOM VIEW ...