LG LMVM1945 Service Manual

IMPORTANT NOTES:

UNIT MUST BE DISCONNECTED FROM ELEC­TRICAL OUTLET WHEN MAKING REPAIRS, RE­PLACEMENTS, ADJUSTMENTS AND CONTIN­UITY CHECKS.
WHEN RECONNECTING THE WIRE LEADS TO
ANY PART, MAKE SURE THE WIRING CONNE­CTIONS AND LEAD COLORS ARE CORRECTLY
MATCHED ACCORDING TO THE OVERALL CIR­CUIT DIAGRAM. (ESPECIALLY SWITCHES AND
HIGH VOLTAGE CIRCUIT.)

A. REMOVING POWER AND CONTROL

CIRCUIT BOARD (Figures 1, 2 and 3)

(1) Remove a screw securing the control panel

assembly to the oven cavity.
(2) Remove the control panel with pushing it upward.
(3) Remove the connector (CN1) and wire leads

(Relay2) from the circuit board.

(4) Remove 3 screws securing the circuit board.

(5) Remove the circuit board from the control bracket

carefully.

7-4

Figure 2

Control Bracket

Figure 3

Circuit Board

DISASSEMBLY INSTRUCTIONS

Figure 1

Control Panel

Screw

(CN2)

(CN4)

(CN5)

(RY2)

(CN1)

(CN6)

(CN7)

Power
Transformer

B. REMOVING THE OUT CASE(Figure 4)

(1) Remove the vent grille by removing two screws

securing it to the out case.
(2) Remove two screws securing it to the air duct.
(3) Remove the mounting plate by turning the screws

(1 or 2 screws) securing it to the out case.
(4) Remove two screws on the left central edge and

two screws on the right central edge of Base plate.

Remove the Mount, All from the out case by

removing one screw securing it to the out case.
(5) Remove the outcase with disconnecting power

cord connector.

Vent Grille

Controller

Door

Mounting
Plate

(1 or 2 screws)

Out Case

Mount,All

Figure 4

7-5

7-6

C REMOVING THE DOOR INTERLOCK

SWITCHES (Figures 5, 6)

(1) Disconnect the wire leads from the interlock

switches.
(2) Remove two screws securing the Latch Board.
(3) Make necessary replacements and check

microwave energy leakage according to

“ADJUSTMENT PROCEDURES” on page 7-11.

Latch Board

Secondary

Interlock Switch

Interlock
Monitor Switch

Interlock Switch

Primary

Latch Board

WH

(from Inverter)
YL(from Turntable Motor)
PK(from Cooktop lamp)

BL(from Oven Thermostat)

Secondary Interlock Switch

Monitor Interlock Switch

Primary Interlock Switch

PK(from P.C.B)
BL(from P.C.B)

WH(from Inverter)

RD(

from Inverter)

Figure 5

Figure 6

WIRE COLOR

SYMBOL COLOR

WH
BK
BR
RD

BL

PK

GY

N.P.

WHITE
BLACK
BROWN
RED

YL

YELLOW

BLUE

PINK

GREY

GN

GREEN
Not Provided