Pioneer SC-82 Service Manual page 32

1
AUDIO ASSY DIAGNOSIS

No sound in plural input modes of speaker and Preout
A
No sound in plural channels
Yes
Check of power source: Is there ±12V in JP3001 ?
Yes
7V and -7V are output from Q3001 and 3002.
Yes
MUTE signal of the relevant channel of CN2861 is "L".
Yes
When CN2861 volume is changed, the signal is
B
transmitted to 11, 12, 13pin.
Yes
Check the broken point (start with checking the relevant
channel of CN2502), and check the peripheral circuit.

No sound only in analog input
Check the path from each input terminal to IC2501.

No sound only from HEADPHONES
Check the peripheral of IC2801.

C
No sound only from ZONE 2 and ZONE 3 (Both of them, Either of them)
MUTE signal of the relevant channel of CN2861 is "L."
Yes
When CN2861 ZONE volume is changed, the signal is
transmitted to 11, 13pin.
Yes
Check the broken point (start with checking the relevant channel (34, 35, 76, 77pin of
IC2501), and check the peripheral circuit.

No sound only from ZONE 2 of FRONT USB
D
Check the path from 1, 3pin of CN2502 to IC2501.

No sound only in BT
Check the path from 1, 3pin of CN3001 to IC2501.

No sound only in Tuner
The signal is transmitted to 7, 9pin when CN3902 is in
reception state.
Yes
5V is output from Q3901.
Yes
E
When the frequency of the tuner of CN3902 is changed, the
signal is transmitted to 1, 2, 3, 4pin.
Yes
Check the signal path form CN3902 to IC2501.

No sound only from DVR/BDR OUT
Check the path and circuit between IC2501 and JA2504.
F
32
1
2
No
SC-82
2
3
Check the broken point (start with checking the
relevant channel of CN2502)
No
Check the circuit of the connection destination.
No
Check the circuit.
No
Check the circuit of the connection destination.
No
Check the circuit of the connection destination.
No
Check the circuit of the connection destination.
No
Check the circuit of the connection destination.
No
Check or repalce TUNER MODULE.
No
Check the circuit.
No
Check the signal path between
CN3902 and CN2861.
3
4
4