Mitsubishi Electric PUZ-SWM60VAA Service Manual page 76

OPERATING PROCEDURE
6. Disassembling the electrical parts box
(S(H)WM140V model only)
(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 the hooks on the left
side.)
(5) Disconnect all the connectors on the noise filter circuit
board. (Remove the lead wire fixing bolts (4 for front/ 6 ×
12) on board.)
(6) To remove the noise filter circuit board, release it from
the support.
(7) Remove the cont base fixing screws (3 for front/ 4 × 10)
to remove the cont base. (The cont base is fixed to the
electrical parts box with the hooks on the left side.)
(8) Disconnect all the connectors on the power circuit board.
(Remove the lead wire fixing bolts (2 for front/ 6 × 12) on board.)
(9) Remove the PB fixture fixing screws (4 for front/ 3 ×12)
to remove the PB fixture.
(10) To remove the power circuit board, remove the power
circuit board fixing screws (4 for front/ M3 x 12 and 2
for front/ M4 x 12), then release the board from the PB
holder.
(11) Disconnect the connectors on reactor, then remove the
reactors (DCL1, DCL2, DCL3) fixing screws (6 for rear/ 4
× 10) to remove the reactors.
(12) Remove the thermistor <Heat sink> (TH8) fixing screw (1 for
front/ M3 × 8) to remove the thermistor <Heat sink> (TH8).
(13) To remove the heat sink, remove the heat sink fixing
screws (4 for front/ 4 ×10), then release the heat sink
from the PB holder.
Note 1: When reassembling the electrical parts box, make
sure the wirings are correct.
7. Removing the thermistor <2-Phase Pipe> (TH6)
(1) Remove the service panel. (See Photo 1)
(2) Remove the top panel. (See Photo 1)
(3) Disconnect the connector TH7/6 (RD) on the controller
circuit board in the electrical parts box. (See Photo 3-1)
(4) Loosen the fasteners for the lead wire in the electrical
parts box.
(5) Loosen the clamp for the lead wire on the rear of electri-
cal parts box.
(6) Pull out the thermistor <2-phase pipe> (TH6) from ther-
mistor clip.
Note 1: The wiring of thermistor <Liquid>(TH3), thermistor
<2-phase pipe> (TH6) and thermistor <Ambient>
(TH7), are fixed with a band.
When replacing the thermistor, cut the band.
8. Removing the thermistor <Ambient> (TH7)
(1) Remove the service panel. (See Photo 1)
(2) Remove the top panel. (See Photo 1)
(3) Disconnect the connector TH7/6 (RD) on the controller
circuit board in the electrical parts box. (See Photo 3-1)
(4) Loosen the fasteners for the lead wire in the electrical
parts box.
(5) Loosen the clamps for the lead wire on rear of electrical
parts box.
(6) Remove the sensor holder fixing screw (1 for rear/ 5 ×
12) to remove the sensor holder.
(7) Pull out the thermistor <Ambient> (TH7) from sensor holder.
Note 1: The wiring of thermistor <Liquid>(TH3), thermistor
<2-phase pipe> (TH6) and thermistor <Ambient>
(TH7) are fixed with a band.
When replacing the thermistor, cut the band.
OCH809A
PHOTOS/ FIGURES
Photo 6-1
Cont base front
Controller circuit board
Power circuit board
Photo 6-3
PB fixture
Photo 6-5
PB holder
Heat sink Thermistor <Heat sink>
(TH8)
Photo 7
Photo 8
Thermistor <Ambient> (TH7) and sensor holder
76
Photo 6-2
Cont base
Noise filter circuit board
Photo 6-4
Reactors
Thermistor
<2-Phase Pipe>
(TH6)