Disassembly - Pioneer SX-20-K Service Manual

5

7. DISASSEMBLY

Note 1 : Even if the unit shown in the photos and illustrations in this manual may differ from your product, the procedures
described here are common.
Note 2 : As for the assembling, please perform assembling following to the opposite procedures of How to Disassemble.
If any notes are existed, please follow those instructions.
Note 3 : Discharge the electricity of the unit, before the diagnosis. (Refer to the " [1] Discharge" )
[1] Discharge
[1-1] Main Capacitor (C509, C510)
(1) Unplug the power cord.
(2) Remove the Cabinet.
(Refer to the " [2-1] Cabinet". )
(3) Connect J319(B+) of the MAIN ASSY to
J289(B-) or J290(B-), with a resistor of 47 to
100Ω , 2W or more.
∗ Discharge time: 30 to 60 sec. (according to
the resistor.)
(4) Check by a tester if the voltage of each B+
and B- terminal is 1 V or less.
∗ Connect the tester's GND terminal to a
Chassis.
∗ If the voltage is higher than 1V, repeat the
step (3).
[1-2] FL -30V
[ Method: 1 ]
(1) Unplug the power cord.
(2) Remove the Cabinet.
(Refer to the " [2-1] Cabinet". )
(3) Disconnect the connector.
(Refer to the step (1) and (2) of " [2-2] Front
Section". )
(4) Connect J138(-30V) of the MAIN ASSY to
J186(GND), with a resistor of 47 to 100Ω,
2W or more.
∗ Discharge time: 5 to 10 sec. (according to
the resistor.)
(5) Check by a tester if the voltage of -30V
terminal is 1 V or less.
∗ Connect the tester's GND terminal to a
Chassis.
∗ If the voltage is higher than 1V, repeat the
step (4).
5
6
C510 (B-)
J290 (B-)
Front
J138 (-30V)
GUIDE R ASSY
Front
SX-20-K
6
7
47 to 100Ω
2W or more
C509 (B+)
J319 (B+)
J289 (B-)
47 to 100Ω
2W or more
J186 (GND)
7
8
A
B
MAIN ASSY
C
D
E
FPC101
MAIN ASSY F
37
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