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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.
4-3. SERIAL FLASH (IC503)
4-3-1. Solution
Please check and replace IC503 on MAIN board.
4-3-2. How to troubleshoot (Countermeasure)
1) If the crystal (X500) does oscillate, check serial flash (IC503) on MAIN board.
Check pin8 (VCC), pin6 (CLK), pin1 (CS), pin2 (DO), pin5 (DI) of below waveform.
2) If pin1, 2, 5, 6 doesn't come out, check registers (R563, R564, R534, R535, R536, R5E4) of IC503.
If registers of IC503 is OK, then replace IC503. (it need to download program.)
3) After change IC503, if It is still not below waveform, check IC501 (DSP IC).
4-3-3. Service hint (Any picture/ Remark)
IC503
IC503
< MAIN board bottom view >
ONE POINT REPAIR GUIDE
VCC
CS#
CLK
DO
< Signal waveform >
3-8
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