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<Voice output error>
+12 V DC at 1st and 2nd pins of JP1?
Signal input of 4th pin of U12 is at H level
(+5 V DC)?
Input signal of 3rd and 5th pins of U12 is normal?
Signal input at 1st and 7th pins of U12 changes
when voice volume is changed.
Signal output at 8th, 10th, 11th and 13th pins of
U12 is normal?
Check speakers and speaker cables.
• Check connection of JP1 connector.
• Check fuse F1 of Power Jack PWB.
Check mute input circuit of I/F board.
Check power supply, vo ice input and voice
input circuit of I/F board.
Check control PWB and the volume circuit
around U11.
Check amplifier circuit around U12.
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