Mitsubishi Electric EHST20C-VM6HA Service Manual page 57

DISASSEMBLY PROCEDURE
3. How to remove the electrical parts
(Steps (1) through (3) are applied to all the following parts.)
<Control box cover> (Photo 3-1)
(1) Remove the front panel. (Refer to Procedure 1).
(2) Remove the 4 screws holding the control box cover.
(3) Slightly lift and pull out the control box cover.
<Earth leakage breaker> (Photo 3-2)
(4) Disconnect all the lead wires from the earth leakage
breaker.
(5) Remove the 2 screws on the earth leakage breaker.
Note:
To avoid dropping of the breaker, hold the breaker by
hand when removing the last screws.
<Contactor> (Photo 3-2)
(4) Disconnect all the lead wires from the contactors.
(5) Remove the 2 screws on each contactor.
Note:
To avoid dropping of the contactors, hold the contac-
tors by hand when removing the last screws.
<Terminal block> (Photo 3-2)
(4) Disconnect all the lead wires from the terminal block. (To
disconnect the S1, S2 and S3 lead wires, disengage the
locks by pressing on the claws.)
(5) Remove the screw on the terminal block.
Note: To avoid dropping of the terminal block, hold the
terminal block by hand when removing the screw .
<Controller board> (Photo 3-3)
(4) Disconnect all the lead wires from the controller board.
(5) Remove the controller board from the 7 board supports.
Photo 3-1
Control box
cover
Photo 3-2
Controller
board
CNBHT
connector
THW3
connector
w The photos shown are of the EHST20C-VM6HA model.
Photo 3-3
57
PHOTOS
Control box cover
fixing screws
Control box cover
fixing screws
Earth leakage breakers
Control box
(ECB1, ECB2)
Terminal block (TB1)
Controller
board
Contactors