Pioneer SC-71 Service Manual page 28

1
NO SOUND (Except for troubles caused by setting and others)
EXT STEREO mode : 2ch signals are distributed to all channels.
OPTMUM Surr mode : Surround mode of headphones
A

No sound from speakers (Single channel - Check only the signal path of the relevant channel. Plural channels
- There may be troubles with power source, control signals: MUTE, DET and others. Bad connection of cables
and connectors should be also considered.)
No sound only from front
channels (L/R 2 channels)
Yes
Sound comes form speakers in Pure Direct by
applying a signal to analog input terminal.
Yes
B
In EXT STEREO, the signal of the
relevant channel does not exist in
D-AUDIO BRIDGE2_SS ASSY.
Yes
Check the path of the relevant
signal in DIGITAL MAIN_L ASSY.

No sound only from Preout (Single channel - Check only the signal path of the relevant channel. Plural channels
- There may be troubles with power source, control signals: MUTE, DET and others. Bad connection of cables
and connectors should be also considered.)
C
No sound from speakers additionally
Yes
In EXT STEREO, the signal of the relevant channel does not exist in
D-AUDIO BRIDGE2_SS ASSY.
Yes
Check the path of the relevant signal in DIGITAL MAIN_L ASSY.

No sound only in COAX and OPT input (Single channel - Check only the signal path of the relevant channel.
Plural channels - There may be troubles with power source, control signals: MUTE, DET and others.
D Bad connection of cables and connectors should be also considered.)
The signal of the relevant channel exists in OPT COAX_SS ASSY.
Yes
Check the path of the relevant signal in DIGITAL MAIN_L ASSY.

No sound only in AutoSurr in analog input (Single channel - Check only the signal path of the relevant channel.
Plural channels - There may be troubles with power source, control signals: MUTE, DET and others.
Bad connection of cables and connectors should be also considered.)
E
The signals of the relevant channel (FL IN, FR IN) exist in
D-AUDIO BRIDGE2_SS ASSY.
Yes
Check the path of the relevant signal in DIGITAL MAIN_L ASSY.
F
28
1
2
No
The sound of the relevant
channel does not come form Preout.
No
No
Check the path of the relevant
channel in AUDIO_SS ASSY.
2
3
No
The signal of the relevant channel
exists in IR BUFFER_SS ASSY.
Yes
Check the path of the relevant channel in D-AMP_SS ASSY.
No
Check the path of the relevant channel
in AUDIO_SS ASSY.
No
Check the path of the relevant channel
in AUDIO_SS ASSY.
No
Check the path of the relevant channel
in OPT COAX_SS ASSY.
No
Check the path of the relevant channel
in AUDIO_SS ASSY.
SC-71
3
4
No
Check the path of
the relevant
channel in
Yes
AUDIO_SS ASSY.
4