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.
4-2. CRYSTAL (X500)
4-2-1. Solution
Replace X500 on MAIN board.
4-2-2. How to troubleshoot (Countermeasure)
1) If 3.3 VA & 1.2 VA is normal, check reset 'High' of IC501 pin T12 on MAIN board.
If MAIN_RESET isn't high, check MICOM (IC101) pin40.
2) If MAIN_RESET is high, check the soldering status of 24 MHz crystal (X500).
3) If the crystal (X500) doesn't oscillate, check R508, C502, C503 around crystal (X500).
If there's no defective component, then replace X500.
4-2-3. Service hint (Any picture/ Remark)
< MAIN board top view >
ONE POINT REPAIR GUIDE
IC501
IC501
X500
X500
X X I
XO
< Signal waveform >
3-7
X500