Pioneer SX-20-K Service Manual page 17

5
a
Yes
Is there signal
No
in IC601 pin 3/pin 5?
(Check the C122L/R - pin.)
Yes
Is there DC+15V in IC601 pin 8?
No • R218 or R215 is defective or its
(Check the C141 + pin.)
Is there DC-15V in IC601 pin 4?
(Check the C143 - pin.)
Yes
Is there signal
No
in IC601 pin 1/pin 7?
(Check the C601L/R + pin.)
Yes
Is there signal
No
in Power Amp input?
(Check the J335, J336.)
Yes
Is there signal
No
in Power Amp output?
(Check the J122 L_HOT,
J124 FR_HOT.)
Yes
Is SPK-A/RLY High?
No
(Check the R199
SPK-A/RLY.)
Yes
• RLY302 is defective or its solder is
defective.
• Q314 is defective or its solder is
defective.
Speaker_B No sound
[Product state]
• Power cord connection (230 V/50 Hz)
• Unit POWER SW: ON
• Power ON operation by remote control
• SPEAKER-B selection
• INPUT: SACD/CD
A sound does not come out
from Speaker_B.
No
Does a sound come
out from Speaker_A?
Yes
Is SPK-B/RLY High?
No IC101 is defective or its solder is
(Check the R200
SPK-B/RLY.)
Yes
• RLY301 is defective or its solder is
defective.
• Q313 is defective or its solder is
defective.
5
6
• IC605 is defective or communication
defective or its solder is defective.
• C122L/R solder is defective.
solder is defective.
• Check the ±15 V power supply.
• IC601 is defective or its solder is
defective.
• D1000 to D1003 are defective or
those solders are defective.
• Q107 or Q113 is defective or its
solder is defective.
Is the voltage of
MAIN_MUTE 0 V?
(Check the J317 MAIN_MUTE.)
Yes
IC101 is defective or its solder is
defective.
• Power Amp block is defective .
• Check a solder of Power Amp block.
IC101 is defective or its solder is
defective.
I
See "Speaker_A No Sound".
defective.
6
7
• Q314L/R, Q316, Q317 are defective
or those solders are defective.
No
• Q315 is defective or its solder is
defective.
• C601L/R solder is defective.
SX-20-K
7
8
A
B
C
D
E
F
17
8