LG MB-4384B Service Manual page 20

COMPONENTS
FUSE
H.V. FUSE
HEATER ELEMENT
(Wire leads removed.)
GRILL THERMOSTAT
OVEN THERMOSTAT
MAGNETRON
THERMOSTAT
TEST PROCEDURE
Check for continuity of the fuse with an
multi-meter.
NOTE: If the fuse is blown, check the primary, the secondary, and the monitor switches,
H.V.D. and H.V.C. before replacing the fuse.
If the fuse is blown by improper switch operation replace the defective switch and the
fuse at the same time. Replace just the fuse if the switches operate normally.
Check for continuity of the H.V.Fuse with
multi-meter.
Measure the resistance.
(Multi-meter scale: Rx1)
Measure the resistance with 500V-100M ohm
insulation resistance meter.
NOTE: Make sure heater is fully cooled when tested.
5-10
RESULTS
Normal Abnormal
Normal Abnormal
Normal:
*Grill heater
Approx. 38 ohm
o
(at 20 ~ 30 C)
Normal: more than 0.5 Mohm
0°C~Approx.90°C Approx.90°C
0°C~Approx.145°C Approx.145°C