5-15
(TROUBLE 3) Display shows all figures set, but oven does not start cooking while
desired program times are set and START pad is touched.
(TROUBLE 4) Oven seems to be operation but output power is low.
CONDITION
CHECK
RESULT
CAUSE
REMEDY
1.Setting time does
not count down
when touching
START pad.
2. Fan motor or
oven lamp
do not turn
on.
No continuity.
continuity.
No continuity.
Continuity.
Check the con-
nection between
connector and
P.C.B assembly.
Defective
secondary switch.
Replace
secondary switch.
Defective P.C.B
assembly.
Replace P.C.B
assembly.
Check continuity
of secondary
switch (with
door closed).
Check fan motor.
Check oven lamp.
Abnormal.
Abnormal.
Normal.
Defective fan
motor.
Defective oven
lamp.
Replace fan
motor.
Replace oven
lamp.
Loose connection.
Connection then
tightly.
CONDITION
CHECK
RESULT
CAUSE
REMEDY
Output is low.
Lower than 90% of
rating voltage.
Normal.
Normal.
Abnormal.
Abnormal.
Measure the
output power.
Disconnect the
wire leads from
relay 2 and check
on and off time
with multitester.
Defective P.C.B
assembly.
Replace P.C.B
assembly.
Decrease in power
source voltage
with load.
Suggest customer
contact local
electric power
utility co. or
qualified
electrician.
Check the
power source
voltage.
Defective
magnetron.
Replace
magnetron.
NOTE: Refer to Page 5-3 for measuring of microwave power output.
Summary of Contents for NN-ST342M
Page 9: ...SCHEMATIC DIAGRAM 4 3...
Page 29: ...6 2 DOOR PARTS D04 05 S03 D06 01 05 08 D03 D 1 2 3 4 5 6 7 8...
Page 30: ...6 3 CONTROL PANEL PARTS C 05 C18 S03 C01 C55 C 11 15 12 9 10...
Page 31: ...6 4 OVEN CAVITY PARTS 21 25 24 27 26 19 22 64...
Page 32: ...6 5 LATCH BOARD PARTS 28 29 29 30 32...
Page 33: ...INTERIOR PARTS 6 6 34 37 38 39 40 41 42 43 44 45 48...
Page 34: ...6 7 BASE PLATE PARTS 49 50 51 52 54 55 63 58 58 58 58...
Page 40: ......
