Pioneer SX-20-K Service Manual page 18

1
Phones No sound
A
[Product state]
• Power cord connection (230 V/50 Hz)
• Unit POWER SW: ON
• Power ON operation by remote control
• INPUT: SACD/CD
A sound does not come out
from phones.
B
Does a sound come
out from Speaker_A?
Yes
Is there signal in
RLY303?
(Check the R343L/R.)
Yes
Is H/P_RLY High?
(Check the J107 H/P_RLY.)
C
Yes
• RLY301 is defective or its solder is defective.
• Q313 is defective or its solder is defective.
• Connection of CP301 is defective.
• JACK401 is defective or its solder is defective.
NETWORK No sound
[Product state]
• Power cord connection (230 V/50 Hz)
• Unit POWER SW: ON
D
• Power ON operation by remote control
• SPEAKER-A selection
• INPUT: NETWORK
A sound does not come out
from NETWORK input.
Does a sound come
out from SACD/CD input?
E
Yes
Is there signal in
IC605 pin 2/pin 31?
(Check the C106L/R + pin.)
Yes
IC605 is defective or communication
defective or its solder is defective.
F
18
1
2
No
I
See "Speaker_A No Sound".
No R343L or R343R is defective or its
solder is defective.
No IC101 is defective or its solder is
defective.
No
I
See "Speaker_A No Sound".
No • JACK102 solder is defective.
• C106L or C106R solder is defective.
2
3
RECODER IN No sound
[Product state]
• Power cord connection (230 V/50 Hz)
• Unit POWER SW: ON
• Power ON operation by remote control
• SPEAKER-A selection
• INPUT: RECODER IN
A sound does not come out
from RECODER input.
Does a sound come
out from SACD/CD input?
Yes
Is there signal in
IC605 pin 3/pin 30?
(Check the C109L/R + pin.)
Yes
IC605 is defective or communication
defective or its solder is defective.
SX-20-K
3
4
No
I
See "Speaker_A No Sound".
No • JACK101 solder is defective.
• C109L or C109R solder is defective.
4