Marantz AV7005 Service Manual page 58

4.2. Analog audio
No sound is output
Is the voltage of ±8V supplied to
SIDE CNT B'D CP6 13-16 pin?
YES
Is the voltage of +12V supplied to
emitter of Q8003, and voltage of
-12V supplied to emitter of Q8004 of
BALANCE OUT B'D?
YES
Is the voltage of +12V supplied to
the output terminal of U8001 of
BALANCE OUT B'D?
YES
Is the audio signal transmitted to
BALANCE OUT B'D N4001 and
N4002?
NO
Is the serial data for electronic volume
transmitted to FRONT CNT B'D
CP108 18,19pin?
YES
Does the output reray of preout
operate normally?
YES
Once more, checking the connection of the connector.
When can specify the trouble of the channel and function, Check signal route where it
corresponds.
NO
The power supply of ±8V is repaired.
NO
The power supply of ±12VA is
repaired.
NO
The power supply of 12V_RELAY is
repaired.
YES
The pre amplifi er is repaired.
NO
Is the connector correctly connected
with HDMI B'D?
58
NO
Connect the connectors properly.
YES
The HDMI B'D is repaired.