Denon PMA-710AE - No Sound Output (Single Channel)

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PMA-710AE
2.4.
3. The power turned on, but a sound does not output normally. (Single channel)
Power indicator LED is lit normally (green or
orange).
Check each connector.
Is the fuse (F901) normal?
Check the voltage of each
department.
Check the operation of the
switching relay, switching IC
and speaker relay.
Check the Signal line.
Power indicator LED is lit normally (green or
orange).
Check each connector.
Check the voltage of each
department.
Check the operation of the
switching relay, switching IC
and speaker relay.
Check the Signal line.