Marantz SR-12S1 Service Manual page 56

No Sound
No sound from SPK
no
Main in or
Pre out is OK ?
yes
no
7.1ch input
is OK ?
yes
no
Digital input
is OK ?
yes
no
Analog input
is OK ?
yes
Confirm
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Power amp circuit P114,154,
Relay Driver circuit P124,P164
has some problem
Audio SW-QS70 (PS54),
Volume, mute Tr (PG04)
has some problem.
DIG SEL:QA03,04,07(PD04),
no
Encode status
DIR:QR50(P604),DSP:Q610,640
shows ?
yes
P654 Connection has problem
yes
no
Test Tone is
DSP:Q610,640,DAC:QD01-04
OK ?
(PD04) has some problem.
P654 Connection has problem
yes
DSP:Q610,640(P604)
has some problem ?
no
TAPE or VCR
OUT is OK ?
yes
Audio/Visual Function SW
is OK
ADC (QK51,52:PD04) has
some problem
76
has some problem.
DIG.SEL, DIR is OK
Audio Function SW
(QS01,02- PS04)
Visual Function SW
(QQ01,02-PQ04)
has some problem