Pioneer SC-99 Service Manual page 25

5

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.)
Apply a signal to COAX and OPT input terminal but not output
from preout and SPEAKER in AutoSurr.
Yes
Return to AutoSurr of analog input but DIRDATO, DIRBCK, DIRLRCK,
DIRMCKI and DIRMCKO of D-DAC BRIDGE ASSY are not existed.
Yes
Check the path of the relevant signal in DIGITAL MAIN ASSY.

No sound from HEADPHONES (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.)
If it is impossible to change to HEADPHONE, check the path of XHPDET signal.
Sound comes from HEADPHONE
in Pure Direct by applying a signal
to analog input terminal.
Yes
In AutoSurr with removing
HEADPHONE, the signal of the
relevant channel does not exists 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.

No sound only from ZONE (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 ZONE SW - Check the relevant path in AUDIO ASSY.
Sound comes from ZONE2 or ZONE3 OUT by applying the signal to
analog input terminal.
Yes
If music content is replayed with Front USB terminal, sound does
not from ZONE2.
Yes
In AutoSurr, the signal of the relevant channel exist in
A-DAC BRIDGE ASSY.
Yes
The signal(ZFDA, ZBCK, ZLRCK, ZMCK) of the relevant
channel does not exist in D-DAC BRIDGE ASSY.
Yes
Check the path of the relevant signal in DIGITAL MAIN ASSY.
Yes
Check the path of the relevant signal in FRONT HDMI USB ASSY.
5
6
No
No
Check the path of the relevant
channel in AUDIO ASSY.
No
Check the path of the relevant
channel in DAC HIGH ASSY.
SC-99
6
7
No
Check the path of the relevant channel
in DAC HIGH ASSY.
No
Check the path of the relevant channel
in DAC HIGH ASSY.
No
Sound comes from
Preout in PureDirect.
Yes
No
HP signal exists in
FRONT BRIDGE ASSY.
Yes
No
HP signal exists in
FB CONNECT ASSY.
Yes
No
HP signal exists in
INTERFACE_M ASSY.
Yes
No
HP signal exists in
F-IN BRIDGE ASSY.
Yes
Check the HP signal
path in MIC HP ASSY.
No
Check the path of the relevant channel
in AUDIO ASSY.
Check the path of the relevant channel
No
in AUDIO ASSY.
Check the path of the relevant channel
No
(ZONE2 DAC) in DAC HIGH ASSY.
7
8
Check the path of the relevant
channel in AUDIO ASSY.
Check the path of the relevant
channel in AUDIO ASSY.
Check the path of the relevant
channel in FRONT BRIDGE
ASSY.
Check the path of the relevant
channel in FB CONNECT
ASSY.
Check the path of the relevant
channel in INTERFACE_M
ASSY.
25
8
A
B
C
D
E
F