Disassembly - Pioneer VSX-523-K Service Manual

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7. DISASSEMBLY

Note:
Even if the unit shown in the photos and illustrations in this manual may differ from your product, the procedures
described here are common.
Some connections of the housing wires or connectors may be tight. When disconnecting those wires or
connectors, be careful not to damage them.
1. Discharging
[1] MAIN Assy Capacitor (C55, C58)
[Procedures]
(1) Unplug the power cord.
(2) Disconnect the 10P connector from CP403 of the AMP5 Assy between CN3 of the MAIN Assy.
(3) Disconnect the 7P connector from CP7 of the REG Assy between W7 of the MAIN Assy.
(4) Connect B+ and B– terminal of the D7, using resistor leads with 47 - 100 ohms (2 W or higher), for discharging.
∗ Discharging time: 30 - 60 seconds, depending on the level of resistance.
(5) Check that the voltage between the B+ and B– terminals is less than 1 V, using a tester.
∗ Be sure to connect the GND terminal of the tester to the chassis.
∗ If the voltage is still 1 V or higher, repeat Step (4).
AMP5 Assy
[2] FL-30 V Capacitor (MAIN Assy C101)
[Procedures]
(1) Unplug the power cord.
(2) Connect pins 3, 4 (–30V) and pins 5, 6 (GND) of the
CN704B on the CPU Assy,
using resistor leads with 47-100 ohms (2 W or higher),
for discharging.
∗ Discharging time: 5 - 10 seconds, depending on the
level of resistance.
(3) Check that the voltage between the –30V terminal is less
than 1 V, using a tester.
∗ Be sure to connect the GND terminal of the tester to
the chassis.
∗ If the voltage is still 1 V or higher, repeat Step (2).
5
6
CP403
CP7
REG Assy
VSX-523-K
6
7
C58 C55
B– B+
D7
47 - 100 ohms
(2 W or higher)
CN704B
GND
−30V
7
8
A
B
C
MAIN Assy
D
CPU Assy
E
47 - 100 ohms
(2 W or higher)
F
31
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