Checkout Procedures - LG LMV1314B Service Manual

COMPONENTS
RELAY2
NOTES:
• A MICROWAVE ENERGY TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR ANY
REASON.
• MAKE SURE THE WIRE LEADS ARE IN THE CORRECT POSITION.
• WHEN REMOVING THE WIRE LEADS FROM THE PARTS, BE SURE TO GRASP THE CONNECTOR, NOT
THE WIRES.
B. CHECKOUT PROCEDURES
(1) CHECKOUT PROCEDURES FOR FUSE BLOWING
CAUTION:REPLACE BLOWN FUSE WITH 20 AMPERE FUSE.
Fuse blows immediately after
the door is closed.
Fuse blows immediately after
the door is opened.
Fuse blows when the door is closed and START
key is touched.
NOTES:
• If the fuse is blown by an improper switch operation, replace the defective switches and the fuse at the same
time. After replacing the defective switches with new ones, make sure that they are correctly connected.
• Check for microwave energy leakage according to INTERLOCK ADJUSTMENT PROCEDURES on page 7-11
when the primary interlock, secondary interlock switches and/or the interlock monitor switches are adjusted or
replaced.
TEST PROCEDURES
Check for continuity of relay 2 with an
ohm-meter.
(Remove wire leads from relay 2 and
operate the unit.)
Relay 2
Figure 28
PROBLEMS
POWER
LEVEL
10
Improper operation of the primary interlock, secondary
interlock switches and/or the interlock monitor switch.
Malfunction of the high voltage transformer; the high
voltage capacitor including the diode, the magnetron,
the blower motor or the circuit board.
7-17
RESULTS
1 4 sec
2 6 sec
3 8 sec
4 10 sec
5
12 sec
6 14 sec
7 16 sec
8 18 sec
9 20 sec
22 sec
CAUSES
18 sec
16 sec
14 sec
12 sec
10 sec
8 sec
6 sec
4 sec
2 sec
0