Disassembling The Electrical Parts Box - Mitsubishi Electric PUZ-WM50VHA Service Manual

OPERATING PROCEDURE

17. Disassembling the electrical parts box

(1) Remove the electrical parts box. (See Photo 3-1)
(2) Disconnect all the connectors on the controller circuit
board.
(3) To remove the controller circuit board, release it from the
support.
(4) Remove the cont base front fixing screws (3 for front/ 4 ×
10) to remove the cont base front.
(The cont base front is fixed to the electrical parts box
with a hook on the left side.)
(5) Disconnect all the connectors on the power circuit board.
(6) To remove the power circuit board, remove the power cir-
cuit board fixing screws (4 for front/ 3 × 12, 2 for front/ 4
× 18, and 1 for front 4 × 10), then release the board from
the support.
(7) Remove fixing screws (4 for rear/ 4 × 10) to remove the
reactor (ACL), then disconnect the connectors on reactor.
(8) Remove the thermistor <Heat sink> (TH8) fixing screws
(2 for front/ 3 × 12) to remove the thermistor <Heat sink>
(TH8).
(9) To remove the heat sink, remove the heat sink duct fixing
screws (6 for front/ 4 × 10), then slide the heat sink duct
sideways to remove the heat sink.
Note 1: When reassembling the electrical parts box, make
sure the wirings are correct.
Note 2: The reactor is attached to the rear of the electrical
parts box.
OCH727
PHOTOS/FIGURES
Photo 17
Controller circuit board
Photo 18
Thermistor <Heat sink> (TH8)
Photo 19
Reactor fixing screws
Reactor
(ACL)
Reactor fixing screws
71
Power circuit board
Cont base front
Heat sink
Electrical parts box