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Only for training and service purposes.
ONE POINT REPAIR GUIDE
PRIMARY UNIT
NO SOUND
2-2. OPTICAL
2-2-1. Solution
Replace JACK board.
2-2-2. How to troubleshoot (Countermeasure)
1) Please check 3.3 VA at pin3 of JK201.
2) If 3.3 VA is ok, please check OPT_IN signal at pin1 when OPTICAL mode.
3) If signal is abnormal, replace JACK board.
2-2-3. Service hint (Any picture / Remark)
< JACK board top view >
JK201
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