LG MS-192H Service Manual page 15

(TROUBLE 2) Oven does not start even though the timer is set.
CONDITION
1. Oven does not
operate.
(TROUBLE 3) Output power is low.
CONDITION
Output is low
CHECK
Check the
continuity of the
primary switch
with door
closed.
Check the
continuity of the
secondary
switch with
secondary
switch pushed.
Check the
continuity of the
timer switch
contacts.
Check the
continuity of the
thermostat.
CHECK
Check the
power source
voltage
oscillating.
Measure the
magnetron's
output(See test
procedure).
RESULT
No continuity.
No continuity.
No continuity.
No continuity.
RESULT
Lower than 207V.
Normal
o
Less than 8.5 C.
5-14
CAUSE
Malfunction of the
primary switch.
Malfunction of the
secondary switch.
Malfunction of the
timer switch.
Faulty thermostat.
CAUSE
Decrease in power
source voltage
with load.
Faulty magnetron.
REMEDY
Adjust or replace.
Adjust or replace.
replace.
replace.
REMEDY
Suggest customer
contact local
electric power
utility co. or
qualified
electrician.
Replace.