Mitsubishi Electric PUHZ-SW75VHA.UK Service Manual page 77

From the previous page.
OPERATING PROCEDURE
(6) Remove the terminal cover and disconnect the compres-
sor lead wire.
(7) Remove 2 control box fixing screws (4 × 10) and detach
the control box by pulling it upward. The control box is
fixed with 2 hooks on the left and 1 hook on the right.
4. Disassembling the control box
(1) Disconnect all the connectors on the controller circuit board.
(2) Remove the 3 screws, screw 1, 2 and 3, that fix the plate
equipped with the outdoor controller circuit board, and the
control box, screw 1 from the front and the screw 2 and 3
from the bottom of the control box. (See Photo 4-1 and 4-2)
(3) Slide the plate in the direction of the arrow A and remove it.
(See Photo 5)
(4) Remove the lead wires from the clamp on the bottom of the
control box. (See Photo 4-3)
(5) Remove the 3 screws, screw 4 and 5, that fix the bottom
side of the control box and remove the bottom side plate by
sliding in the direction of the arrow B.
(See Photo 4-3 and 4-4)
(6) Remove the outdoor noise filter circuit board from the con-
trol box. Then remove the 2 screws, screw 6 and 7, that
fix the plate equipped with the noise filter circuit board and
converter circuit board. (See Photo 4-5)
Note: When reassembling the control box, make sure the
wirings are correct.
Photo 4-2
Screw2
Heatsink
Photo 4-4
Noise filter
circuit board
(N.F.)
OCH533B
Bottom plate
of control box
Screw3
Control box
B
Converter
circuit board
(CONV.B.)
Power circuit
board (P.B.)
PHOTOS & ILLUSTRATION
Photo 3-2
Photo 4-1
Photo 4-3
Screw4
Bottom plate of control box
Photo 4-5
Screw6
Noise filter circuit board (N.F.)
77
Electrical
parts box
Control box
fixing screw
Electrical
parts box
Screw1
Controller
circuit board
(C.B.)
A
Clamp
Screw5
Control box
Screw7