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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.
4-4. SDRAM (IC502)
4-4-1. Solution
Please check and replace IC502 on MAIN board.
4-4-2. How to troubleshoot (Countermeasure)
1) Check below waveform & soldering status of SDRAM (IC502) on MAIN board.
If pin17(#CAS), pin18(#RAS), pin19($CS), pin38(CLK), pin29(address), pin2(DQ) doesn't come out,
check damping resistor (R508,R506,R504,R507).
2) If resistor is OK, then replace IC502(SDRAM).
3) After change IC502, if It is still not below waveform, check IC501(DSP IC).
4-4-3. Service hint (Any picture / Remark)
< Signal check point >
ONE POINT REPAIR GUIDE
3-17
< Signal waveform >
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