Pioneer SC-99 Service Manual page 24

1
NO SOUND (Except for troubles caused by setting and others)
EXT STEREO mode : 2ch signals are distributed to all channels.
OPTIMUM 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 from speakers in Pure Direct by
applying a signal to analog input terminal.
B Yes
In EXT STEREO, the signal of the
relevant channel does not exist in
A-DAC BRIDGE ASSY.
Yes
The signal (DATA, BCK, LRCK) of
the relevant channel does not exist
in D-DAC BRIDGE ASSY.
Yes
Check the path of the relevant
signal in DIGITAL MAIN ASSY.
C

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.)
No sound only in DVROUT or PHONO - Check the relevant path in AUDIO ASSY .
No sound from speakers additionally
Yes
In EXT STEREO, the signal of the relevant channel does not exist in
A-DAC BRIDGE ASSY.
D
Yes
The signal (DATA, BCK, LRCK) of the relevant channel does not exist
in D-DAC BRIDGE ASSY.
Yes
Check the path of the relevant signal in DIGITAL MAIN 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.
Bad connection of cables and connectors should be also considered.)
E
Apply a signal to analog input terminal but not output from preout
and SPEAKER in AutoSurr.
Yes
Return to COAX and OPT input but DIRDATO, DIRBCK,
DIRLRCH and DIRMCKO of D-DAC BRIDGE ASSY are not existed.
Yes
Check the path of the relevant signal in DIGITAL MAIN ASSY.
F
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1
2
No
The sound of the relevant
channel does not come from Preout.
No
No
Check the path of the relevant
channel in AUDIO ASSY.
No
Check the path of the relevant
channel in DAC HIGH ASSY.
2
3
No
The signal of the relevant channel
exists in PRE BRIDGE_S ASSY.
Yes
Check the signal path of the relevant channel in
IR BUFFER_M ASSY, or check the path of the power supply
to the relevant channel.
Check the signal path of the relevant channel in
IR INTERFACE_M ASSY, or check the path of the power
supply to the relevant channel.
Check the path of the relevant channel in
D AMP ASSY.
No
Check the path of the relevant channel
in AUDIO ASSY.
No
Check the path of the relevant channel
in AUDIO ASSY.
Check the path of the relevant channel
No
in DAC HIGH ASSY.
No
Check the path of the relevant channel
in DAC HIGH ASSY.
No
Check the path of the relevant channel
in DAC HIGH ASSY.
SC-99
3
4
No
Check the path of
the relevant
channel in AUDIO
Yes
ASSY.
OK
OK
4