Troubleshooting - Samsung RE-1300 Service Manual

11. Troubleshooting
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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 TRANSFORMER, DISCONNECT. ONE LEAD WIRE FROM THESE PARTS
AND THEN CHECK CONTINUITY WITHOUT THE POWER SOURCE ON. TO DO OTHERWISE Mny RESULT IN A FALSE READING ORA
DAMAGE T0 YOUR METER.
DAMAGE THIS CONTROL PANEL. ALWAYS ee GROUND WHILE WORKING ON THIS TO DISCHARGE ANY STATIC CHARGE
BUILT UP.IN YOUR BODY:
First of all operate the microwave oven by observing the correct operating procedures by time cooking in order to find the exact cause
of any trouble.
15-1. Problems not Related to Defects of the Oven
SYMPTOM
CAUSE CORRECTIONS
Check fan motor when thermal cutout is defective.
1. Open or loose lead wire harness
2. Open thermal cutout(Magnetron)
3. Open low voltage transformer
4. Defective Ass'y PCB
1 | Oven is dead.
Fuse is OK.
No display and no operation at all.
Check Ass'y PCB when LVT is defective.
Check adjustment of primary, interlock monitor,
door sensing switch.
1. Shorted lead wire hamess
2. Defective primary latch switch(NOTE 1}
3. Defective monitor switch (NOTE1}
4, Shorted HVCapacitor
5. Shorted HVTransformer (NOTE2}
No disptay and no operation at all.
Fuse is blown.
NOTE 1: All of these switches must be replaced at the same time.
(refer to adjustment instructions)
Check continuity of power relay contacts and if it has continuity, replace power
relay also.
NOTE 2: When HVTransformer is replaced, check diode and magnetron also.
1. Key input is not in-Sequence Refer to operation procedure.
2. Open or loose connection of membrane
key pad to Ass'y PCB
3. Shorted or open membrane panel
4. Defective Ass'y PCB
3 | Oven does not accept
key input(Program)
Replace PCB main.
Adjust door and latch switches.
1. Off-alignment of latch switches
2. Open or loose connection of high voltage
circuit especially magnetron filament
Circuit
NOTE: Large contact resistance will bring
lower magnetron filament voltage and
cause magnetron to lower output and/or
intermittent oscillation.
3. Defective high voltage components
H.V.transformer
H.V.Capacitor
H.V.Diode, H.V.Fuse
Magnetron
4, Open or loose wiring of power relay
5. Defective primary latch switch
6. Defective power relay or Ass'y PCB
4 | Timer starts countdown but no
microwave oscillation.
(No heat while oven lamp and
fan motor turn on.}
Check high voltage component according to
component test procedtire and replace if it is
defective.
Replace PCB main.
Troubleshooting
SYMPTOM CAUSE
CORRECTIONS
Oven Jamp and fan motor turn on 1. Misadjustment or locse wiring
of primary latch switch
2. Defective primary latch switch
Adjust door and latch switches.
Oven can program but timer
does not start.
1. Open or loose wiring of secondary
interlock switch
2. Off-alignment of primary interlock
3. Defective secondary interlock S/W
Microwave output is low.
Oven takes longer time to
cook food.
Adjust door and interlock switches.
1. Decrease in power source voltage.
2. Open or loose wiring of magnetron
filament circuit. (Intermittent oscillation)
3. Aging change of magnetron
Fan motor turns on when plugged in
Loose wiring of door sensing switch
Oven does not operate and return
to the plugged in mode.
Consult electrician.
Check wire of door sensing switch.
Defective Ass'y PCB
Loud buzzing noise can be heard.
Jumtable motor does not rotate.
Oven stops operation during cooking
1. Loose fan and fan motor
2. Loose screws on H.V.Transformer
3. Shorted H.V.Diode
1. Open or loose wiring of turntable motor.
2. Defective turntable motor.
1. Open or loose wiring of primary
interlock switch
2. Operation of thermal cutout{Magnetran)
1, Metallic ware or cooking dishes
touching on the oven wall.
2. Ceramic ware trimmed with gold or
silvér powder also causes sparks.
Uneven cooking
Uneven intensity of microwave due to
its characteristics.
Replace PCB main.
Tighten screws of fan motor.
Tighten screws of H.V.Transformer.
Replace H.V.Diode.
Replace turntable motor.
Adjust door and latch switches.
Educate your customer.
Do not use any type of cookware with
Metallic trimming.
Wrap thinner parts of the food with
aluminum foil.
Use plastic wrap or cover with a lid.
Stir once or twice while cooking
foods such as soup, cocoa, or milk,
Clock noise from the turntable motor
when it starts to operate.
The noise may result from the motor.
"1
Replace turntable motor.