Samsung Electronics
6. Troubleshooting
6-1
PRECAUTION
1. CHECK GROUNDING BEFORE CHECKING FOR TROUBLE.
2. BE CAREFUL OF THE HIGH VOLTAGE CIRCUIT.
3. DISCHARGE THE HIGH VOLTAGE CAPACITOR.
4. WHEN CHECKING THE CONTINUITY OF THE SWITCHES OR TRANSFORM ER, DISCONNECT ONE LEAD WIRE FROM THESE
PARTS AND THEN CHECK CONTINUITY WITHOUT THE POWER SOURCE ON. TO DO OTHERWISE M AY RESULT IN A FALSE
READING OR DAM AGE TO YOUR M ETER.
5. DO NOT TOUCH ANY PART OF THE CIRCUIT OR THE CONTROL CIRCUIT BOARD, SINCE STATIC DISCHARGE M AY DAM AGE IT.
ALWAYS TOUCH GROUND WHILE WORKING ON IT TO DISCHARGE ANY STATIC CHARGE BUILT UP.
6-1 Electrical Malfunction
SYMPTOM
CAUSE
CORRECTIONS
Oven is dead.
1. Open or loose lead w ire harness
Check fan motor when thermal cutout is defective.
Fuse is OK.
2. Open thermal cutout (M agnetron)
No display and no operation at all.
3. Open low voltage transformer
Check Ass'y PCB w hen LVT is defective.
4. Defective Ass'y PCB
No display and no operation at all.
1. Shorted lead w ire harness
Check adjustment of primary, interlock monitor,
Fuse is blow n.
2. Defective primary latch sw itch (NOTE 1)
pow er relay, door sensing sw itch.
3. Defective monitor sw itch (NOTE1)
4. Shorted HVCapacitor
5. Shorted HVTransformer (NOTE2)
NOTE 1: All of these sw itches must be replaced at the same time.
(refer to adjustment instructions)
Check continuity of pow er relay contacts and if it has continuity, replace pow er
relay also.
NOTE 2: When HVTransformer is replaced, check diode and magnetron also.
Oven does not accept
1. Key input is not in-Sequence
Refer to operation procedure.
key input (Program)
2. Open or loose connection of membrane
key pad to Ass'y PCB
3. Shorted or open membrane panel
4. Defective Ass'y PCB
Replace PCB main.
1. Off-alignment of latch sw itches
Adjust door and latch sw itches.
2. Open or loose connection of high voltage
circuit especially magnetron filament
circuit
NOTE: Large contact resistance w ill bring
low er magnetron filament voltage and
Timer starts countdow n but no
cause magnetron to low er output and/ or
microw ave oscillation.
intermittent oscillation.
(No heat w hile oven lamp and
3. Defective high voltage components
Check high voltage component according to
fan motor turn on.)
H.V.Transformer
component test procedure and replace if it is
H.V.Capacitor
defective.
H.V.Diode,H.V.Fuse
M agnetron
4. Open or loose w iring of pow er relay
5. Defective primary latch sw itch
6. Defective pow er relay or Ass'y PCB
Replace PCB main.
