Pioneer SX-20-K Service Manual page 19

5
PHONO No sound
[Product state]
• Power cord connection (230 V/50 Hz)
• Unit POWER SW: ON
• Power ON operation by remote control
A sound does not come out
fromPHONO input.
No
Does a sound come
out from SACD/CD input?
Yes
Is there signal in
No • JACK103 solder is defective.
IC700 pin 3/pin 5?
(Check the C703L/R + pin.)
Yes
Is there signal in
No
IC700 pin 1/pin 7?
(Check the C708L/R + pin.)
Yes
Is there signal in
No C708L, C708R, C710L, C710R
IC605 pin 4/pin 29?
(Check the C710L/R + pin.)
Yes
IC605 is defective or communication
defective or its solder is defective.
TUNER No sound
[Product state]
• Power cord connection (230 V/50 Hz)
• Unit POWER SW: ON
• Power ON operation by remote control
A sound does not come out
from TUNER input.
No
Does a sound come
out from SACD/CD input?
Yes
Is there signal in
No
PACK101 pin 7/pin 8?
(Check the C113L/R - pin.)
Yes
Is there signal in
No
IC605 pin 5/pin 28?
(Check the C113L/R + pin.)
Yes
IC605 is defective or communication
defective or its solder is defective.
5
6
• SPEAKER-A selection
• INPUT: PHONO
I
See "Speaker_A No Sound".
• C703L or C703R solder is defective.
Is there DC+6V in IC700 pin 8?
(Check the R708R.)
Is there DC-6V in IC700 pin 4?
(Check the R708L.)
Yes
IC700 is defective or its solder is
defective.
are defective or those solders are
defective.
• SPEAKER-A selection
• INPUT: TUNER (FM/AM)
• Tuner setting: FM
I
See "Speaker_A No Sound".
C113L or C113R is defective or its
solder is defective.
6
7
• IC105 or IC106 is defective or its
No
solder is defective.
• Check the ±15 V power supply.
Is there DC+5V in PACK101
pin 5? (Check the R708R
for +6 V, R708L for -6 V.)
Yes
Is there communication waveform
in TUNER_SCLK and TUNER_SDIO?
(Check the J405 for TUNER_SCLK,
J406 for TUNER_SDIO.)
Yes
PACK101 is defective or its solder is
defective.
SX-20-K
7
8
• IC103 is defective or its solder is
defective.
No
• BD121 solder is defective.
• D520 is defective or its solder is
defective.
• Check the ±15 V power supply.
• IC101 is defective or its solder is
No
defective.
• PACK101 solder is defective.
8
A
B
C
D
E
F
19