Pioneer SC-99 Service Manual page 27

5

No sound only in POWERD HD ZONE
Speaker setting is correct ?
Yes
Is there signal in the CN9702-22, 24, 25, 26pin of
DIGITAL MAIN ASSY ?
Yes
Is there signal in the IC2038-1, 2, 3, 4pin of
DAC HIGH ASSY ?
Yes
Is there signal in the IC2038-10, 11pin of DAC HIGH ASSY ?
Yes
Is there signal in the CN2003-1, 3pin of DAC HIGH ASSY ?
Yes
Check the VOL IC(IC2501, IC3273) peripheral circuit of
AUDIO ASSY.

No sound by MEDIA SERVER, INTERNET RADIO, FRONT USB, BT and Wi-Fi
Check the connection between DIGITAL MAIN ASSY and
Network Module (AXX7293)
Yes
Check the degital audio signal output (CN9203 - 26, 28, 30, 32, 34pin)
of DIGITAL MAIN ASSY
No
Remove the Network Module (AXX7293) from DIGITAL MAIN ASSY
and check the following voltages of CN9203 - 1pin or 3pin :1.2V / 2pin
or 4pin : 2.5V / 7pin or 9pin : 1.8V / 8pin or 10pin : 3.3V
Yes
Replace the Network Module(AXX7293)
5
6
No
Set the Speaker setting correctly.
No
Check the peripheral circuit of IC1818.
Check the path from IC1602.
No
Check the peripheral path.
No
Check the peripheral circuit of IC2038.
No
Check the peripheral circuit of IC2039.
No
Reconnect the Network Module(AXX7293) to
DIGITAL MAIN ASSY.
Yes
Check the digital audio signal lines or
replace the DIGITAL MAIN ASSY
No
Check the Power IC for problem voltage or
replace the DIGITAL MAIN ASSY
SC-99
6
7
7
8
A
B
C
D
E
F
27
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