Denon DN-MC6000 - Master Output Troubleshooting

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Master output is not outputted correctly.
・
Set the channel input source switch to "LINE".
・
Set the CROSS FADER CONTOUR to "THRU".
・
Set the input level volume to "12
：
00".
・
Set the Cannel FADER to "MAX".
・
Set the master level volume to "14
：
00".
Are audio signals output to 25pin(Lch),17pin(Rch) of
IC600 when an audio signal of 1 kHz 0 dBV is input
externally to the LINE input?
However, current output.
Check the input signal of IC600(4,5,6,7pin),
and replace it if defective.
When the input signal is correct, replace IC600.
Are the audio signals outputted to 7pin and 1pin of
IC601(Lch),IC602(Rch),IC603(Rch),IC604(Lch)?
Check periphery circuit of IC601,IC602,IC603,IC604
from 25pin,17pin of IC600, and service it if
defective.
When the periphery circuit is correct, replace
IC601,IC602,IC603 or IC604.
Is base terminal of Q708(MUTE control signal)
+5V,and has been base terminal of Q600
～
Q603(MUTE drive signal) L(-15V)?
Check periphery circuit of Q708,Q600
～
Q603 and
replace it if defective.
Check periphery circuit of JK600,JK601 from 7pin
and 1pin of IC603,IC604, and replace it if defective.
FLOW CHARTNo.11 (405-MC6000-2783 : I/O UNIT)