Disassembly And Parts Replacement Procedure - LG MH-1355M Service Manual

DISASSEMBLY AND PARTS REPLACEMENT
PROCEDURE
CAUTION
Before touching any oven component or wiring, first of all, disconnect the power supply cord and wait for about
5 minutes (in order to discharge the high voltage capacitor).
A. REMOVING OUTER CASE (FIG. 14)
(1) Remove four screws from the side section.
(2) Remove seven screws from the rear section.
(3) Push the outer case back about 1 inch (3cm)
to free it from the front plate.
(4) Lift the case from the set.
B. REMOVING CONTROL PANEL ASSEM-
BLY AND PCB ASSEMBLY (FIG. 15)
(1) Disconnect the wire leads (from relay 3, 4),
power trans connector (5-pin), thermistor con-
nector (2-pin), temperature probe jack connec-
tor (8-pin) and I/O connector (5-pin).
(2) Remove one screw securing the P.C.B. earth
wire lead and key pad earth bend to the front
plate.
(3) Remove two screws securing the control panel
to the front plate.
(4) Lift the control panel slightly and remove from
the front plate.
(5) Remove the F.P.C. connector the terminal
socket.
(6) Remove three screws securing the P.C.B.
assembly to the control panel.
NOTE:
Remove the wire leads and connector VERY
CAREFULLY Be sure to grasp the connector and
not the wires.
C. REMOVING DOOR ASSEMBLY (FIG. 16)
(1) Remove three tap tite screws securing the
hingeplate-U to the hinge supporte.
(2) To remove the door, tilt the top of the door
towards you and lift the door up.
NOTES:
1. After replacing the door, be sure to check that
the primary switch, monitor switch, oven lamp
switch and secondary switch operate normally.
2. After replacing the door, check for microwave
energy leakage with a survey meter.
(Refer to the test procedure on page 43.)
KEY PAD
– 26 –
CONTROL PANEL
RELEASE BUTTON
HINGE PLATE-U
Fig. 14
PCB SUB
ASM
Fig. 15
Fig. 16