Denon MC2000 Service Manual page 36

FLOW CHART NO.9 (405-MC2-3059 : I/O UNIT, 405-MC2-3058 : CONTROL UNIT)
Master output is not outputted correctly.
Is the FFC(14pin:CN300) connected correctly?
• Set the AUX IN LEVEL volume to "12:00".
Are audio signals output to 7pin(Lch),1pin(Rch) of IC100,
IC102 when an audio signal of 1 kHz 0 dBV is input externally
to the AUX IN input?
Are the audio signals outputted to 7pin(Rch), 1pin(Lch) of
IC106?
Is base terminal of Q4(MUTE control signal) +5V, and has
been base terminal of Q102, Q103, Q110, Q111 (MUTE drive
signal) L(-6.5V)?
Check periphery circuit of JK102 from 7pin(Rch), 1pin(Lch) of
IC106, and replace it if defective.
YES
YES
YES
YES
NO
Reconnect normaly
NO
Check periphery circuit of IC100 from JK100 / IC102 from
IC100, and service it if defective.
When the periphery circuit is correct, replace IC100, IC102.
Check periphery circuit of IC106 from IC102, and replace it if
NO
defective.
When the periphery circuit is correct, replace IC106.
NO
Check periphery circuit of Q4, Q102, Q103, Q110, Q111 and
replace it if defective.
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