Diagnosis; Troubleshooting - Pioneer SX-20-K Service Manual

1

5. DIAGNOSIS

5.1 TROUBLESHOOTING

Speaker_A No sound
A
[Product state]
• Power cord connection (230 V/50 Hz)
• Unit POWER SW: ON
• Power ON operation by remote control
• SPEAKER-A selection
• INPUT: SACD/CD
A sound does not come out
from Speaker_A.
I
B
Is power ON?
Yes
C
D
After power ON, does
Protection Relay (RLY501) do
ON? (sound occurs click)
Yes
Does the sound
output from RECORDER OUT
terminal?
E
Yes
F
a
16
1
2
No
Does the STANDBY LED
lit?
Yes
A protection circuit works.
(See "6. SERVICE MODE".)
Is there DC +3.3V
in 3V3 line?
(Check the J361 (3V3).)
Yes
Is the "POWER_DOWN" line
Low (DC0V)?
(Check the J361.)
Yes
When pressed the "STANDBY/ON"
button of the remote control unit, is
there remote control signal wave?
(Check the R270.)
Yes
Is there DC +3.3V
No
in FL_SW/RLY line?
(Check the J182.)
Yes
• RLY501 is defective or its solder
is defective.
• Q502 is defective or its solder is
defective.
Is there DC+9.0V
No
in +9V line?
(Check the J152.)
Yes
Is there signal
in IC605 pin 6/pin 27?
(Check the C114L/R + pin.)
Yes
Is the voltage of
REC_MUTE 0 V?
(Check the J310 REC_MUTE.)
Yes
IC101 is defective or its solder is
defective.
2
3
Is a DC wave
No No
(rectification waveform DC +8V)
in the D516 cathode side?
Yes
IC301 is defective or its solder is
defective.
• D515 or D523 is defective or its solder is defective.
No
• DZ502 is defective or its solder is defective.
• Q300 is defective or its solder is defective.
• REM401 is defective or its solder is defective.
No
• Connection between CN403 - CP403 is defective.
• Connection between CN402 - CP402 is defective.
• Connection between FPC400 - FPC101 is defective.
No
IC101 is defective or its solder is
defective.
• IC104 is defective or its solder is
No
defective.
• Check the +15 V power supply.
Is there signal
No
in IC605 pin 1/pin 32?
(Check the C103L/R + pin.)
Yes
IC605 is defective or communication
defective or its solder is defective.
• Q552 or Q553 is defective or its
No
solder is defective.
• Q551 is defective or its solder is
defective.
SX-20-K
3
4
Is a AC wave
No
in the D516 anode side?
Yes
D516 to D519 are defective
or Those solders are defective.
• F101 is defective.
• T502 is defective or its solder is
defective.
• JACK102 solder is defective.
No
• C103L or C103R solder is
defective.
4
No