Service Manuals, User Guides, Schematic Diagrams or docs for : Samsung Microwave SMH1816S_XAA Service Manual 5. Troubleshooting

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5. Troubleshooting

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 MAY RESULT IN A FALSE READING OR DAMAGE TO YOUR METER.
5. DO NOT TOUCH ANY PART OF THE CIRCUIT OR THE CONTROL CIRCUIT BOARD, SINCE STATIC
DISCHARGE MAY DAMAGE IT. ALWAYS TOUCH GROUND WHILE WORKING ON IT TO DISCHARGE
ANY STATIC CHARGE BUILT UP.

5-1 Electrical Malfunction

Oven is dead. (No display and no operation at all.)
Open or loose lead wire harness

Fuse is O
Open thermal cutout (Magnetron) Check fan motor when thermal cutout is defecti e.

Open low oltage transformer Check Ass y PCB when L.V.T is defecti e.

Defecti e Ass y PCB

Shorted lead wire harness

Defecti e primary latch switch (NOTE 1)
(NOTE 1)

Defecti e monitor switch (NOTE 1)
(NOTE 1) Check ad ustment of primary, interlock monitor,
power relay, door sensing switch.

Shorted H.V.Capacitor

Shorted H.V.Transformer (NOTE 2)
(NOTE 2)

NOTE 1 All of these switches must be replaced at the same time. (refer to ad ustment instructions)
Check continuity of power relay contacts and if it has continuity, replace power relay also.

NOTE 2 When H.V.Transformer is replaced, check diode and magnetron also.

Oven does not accept key input (Program)

Key input is not in-Se uence Refer to operation procedure.
Oven does not
accept key input Open or loose connection of
membrane key pad to Ass y PCB

Shorted or open membrane panel

Defecti e Ass y PCB Replace PCB main.

Off-alignment of latch switches Ad ust door and latch switches.
Timer starts 28
countdown but
no microwave Open or loose connection of high Check high oltage component according to
Oven does not
accept key input Open or loose connection of
membrane key pad to Ass y PCB

Shorted or open membrane panel
5. Troubleshooting
Defecti e Ass y PCB Replace PCB main.

Timer starts countdown but no microwave oscillation.
(No heat while oven lamp and fan motor turn on.)

Timer starts Off-alignment of latch switches Ad ust door and latch switches.
countdown but
no microwave Open or loose connection of high Check high oltage component according to
oscillation oltage circuit especially magnetron component test procedure and replace if it is
filament circuit (NOTE) defecti e.
Defecti e high oltage components
H.V.Transformer H.V. Capacitor
H.V.Diode, H.V.Fuse Magnetron

Open or loose wiring of power relay

Defecti e primary latch switch

Defecti e power relay or Ass y PCB Replace PCB main.

NOTE Large contact resistance will bring lower magnetron filament oltage and cause magnetron
to lower output and or intermittent oscillation.

Oven can program but timer does not start.
Open or loose wiring of secondary Ad ust door and interlock switches.
Oven can program interlock switch
but timer does
not start Off-alignment of primarysecondary
Open or loose wiring of interlock Ad ust door and interlock switches.
Oven can program interlock switch
but timer does Open or loose wiring of secondary
Defecti e secondary interlock S W Ad ust door and interlock switches.
not start Off-alignment of primary interlock
interlock switch
Oven can program
but timer does Open or loose wiring of secondary Ad ust door and interlock switches.
Oven not start
can program interlockeswitch
Off-alignment of primary interlock
Defecti secondary interlock S W
Microwavedoes
but timer output is low. (Oven takes longer oltage to
Decrease in power source time cook food.)
Consult electrician.
not start
Microwave Off-alignment of primary interlock
output is low Defecti e secondary interlock S W
Open or loose wiring of magnetron
Decrease in power source oltage
filament e secondary interlock S W Consult electrician.
Microwave Defecti circuit.
(Intermittent oscillation)
output is low Open or loose wiring of magnetron
Decrease in power source oltage Consult electrician.
Microwave filament circuit.
Aging of magnetron
output is low (Intermittent oscillation) magnetron
Decrease in power source oltage
Open or loose wiring of Consult electrician.
Microwave filament circuit.
output is low Aging of magnetron
(Intermittent oscillation) magnetron
Open or loose wiring of
filament circuit.
Fan motor turns (Intermittent oscillation)
Aging wiring of door Consult electrician.
Loose of magnetron sensing switch
on when plugged in
Fan motor turns on when plugged in.
Aging of magnetron
Fan motor turns Consult electrician.
Loose wiring of door sensing switch
on when plugged in
Fan motor turns Consult electrician.
Loose wiring of door sensing switch
on when plugged in
Fan motor turns
Oven does not Consult electrician.
Loose wiring of door sensing switch
operate and return in
on when plugged to Defecti e Ass y PCB Replace PCB main.
the plugged
Oven modenot
in does
operate and
not to
Oven doesreturn operate
the plugged and return Ass ythe plugged in mode. PCB main.
Replace
Defecti e to PCB
Oven modenot
in does
operate and return to Defecti e Ass y PCB Replace PCB main.
Oven does not
the plugged Loose fan and fan motor Tighten screws of fan motor.
operate and return to
in mode Defecti e Ass y PCB Replace PCB main.
Loud buzzing noise
the plugged
can be heard
in mode Loose screws on H.V.Transformer Tighten screws of H.V.Transformer.
Loose fan and fan motor Tighten screws of fan motor.
Loud buzzing noise
can be heard Shorted H.V.Diode motor
Loose screws on H.V.Transformer
fan and fan Tighten H.V.Diode. motor.
Replacescrews of H.V.Transformer.
fan
Loud buzzing noise
can be heard Loose fan and fan motor Tighten screws of fan motor.
Loose screws on H.V.Transformer
Shorted H.V.Diode Tighten H.V.Diode.
Replacescrews of H.V.Transformer.
Loud buzzing noise
can be heard Looseor loose on H.V.Transformer
Open screws wiring of Tighten turntable motor.
Replacescrews of H.V.Transformer.
Shorted H.V.Diode Replace H.V.Diode.
Turntable motor does turntable motor. 29
not rotate.
Open or H.V.Diode of
Shorted loose wiring
Defecti e turntable motor
Replace H.V.Diode.
Replace turntable motor.
Loose wiring of door sensing switch Consult electrician.
on when plugged in (Intermittent oscillation)
Aging of magnetron
Fan motor turns Consult electrician.
Loose wiring of door sensing switch
on when plugged in Aging of magnetron
Fan motor turns Consult electrician.
Loose wiring of door sensing switch
on when plugged in
5. Troubleshooting
Oven does not
Fan motor turns
operate and return to Loose e Ass y PCB
Defectiwiring of door sensing switch Consult PCB main.
Replaceelectrician.
onOven does not in
when plugged
the plugged
Fan in mode
motorreturn to
operate and turns Consult PCB main.
Replaceelectrician.
Defectiwiring of door sensing switch
Loose e Ass y PCB
onOven does not in
when plugged
the plugged
Loud buzzing noise can be heard. Ass y PCB
operate and return to
in mode Defecti e Replace PCB main.
Oven does not
the plugged
operate and return to
in mode Defecti e Ass y PCB Replace PCB main.
the plugged
Oven does not Loose fan and fan motor Tighten screws of fan motor.
in mode
Loud buzzing noise
operate and return to Replacescrews of fan motor.
Loose e and fan motor
Defectifan Ass y PCB Tighten PCB main.
Ovenbe heard
can plugged
the does not Loose screws on H.V.Transformer Tighten screws of H.V.Transformer.
Loud buzzing noise
operate and return to
in mode Replacescrews of fan motor.
Defectifan Ass y PCB
Loose e and fan motor Tighten PCB main.
can plugged
the be heard Loose screws on H.V.Transformer Tighten screws of H.V.Transformer.
Loud buzzing noise
in mode Shorted H.V.Diode Replace H.V.Diode.
can be heard Loose fan and fan motor Tighten screws of fan motor.
Loose screws on H.V.Transformer Tighten screws of H.V.Transformer.
Loud buzzing noise Shorted H.V.Diode Replace H.V.Diode.
can be heard Loose screws on H.V.Transformer
fan and fan motor Tighten screws of fan motor.
Tighten screws of H.V.Transformer.
Turntable motor does not rotate. H.V.Diode
Loud buzzing noise Shorted Replace H.V.Diode.
Tighten screws of fan motor.
can be heard Open or loose wiring of
Loose fan and fan motor Replace turntable motor.
Loose screws on H.V.Transformer
Shorted H.V.Diode
turntable motor. Tighten H.V.Diode.
Replacescrews of H.V.Transformer.
Loud buzzing noise
Turntable motor does
can be heard Open or loose wiring of Replace turntable motor.
not rotate. Loose screws on H.V.Transformer Tighten screws of H.V.Transformer.
Turntable motor does Defecti emotor.
turntableH.V.Diode motor
Shorted turntable Replace H.V.Diode.
Open or loose wiring of Replace turntable motor.
not rotate.
Turntable motor does Defecti emotor.
turntableH.V.Diode motor
Shorted turntable Replace H.V.Diode.
Open or loose wiring of Replace turntable motor.
not rotate.
Turntable motor does Defecti emotor.
turntable turntable motor
not rotate. Open or loose wiring of primary
Open or loose wiring of Replace turntable motor.
Ad ust door and latch switches.
stops operation during cooking. motor
Oven stops operation
Turntable motor does
Oven
turntable turntable
Defecti emotor.
interlock switch
Open or loose wiring of primary Replace turntable motor.
Open or loose wiring of
duringrotate.
not cooking
turntable motor.
Defecti eswitch
Ad ust door and latch switches.
Turntable motor does
Oven stops operation Operation turntable motor (Magnetron)
interlock of thermal cutout
not rotate. Open or loose wiring of primary Ad ust door and latch switches.
during cooking
Oven stops operation Operation turntable motor (Magnetron)
Defecti eswitch
interlock of thermal cutout
Open or loose wiring of primary Ad ust door and latch switches.
during cooking
Oven stops operation interlock switch
Operation of thermal cutout (Magnetron)
during cooking Open or loose wiring of primary
Metallic ware or cooking dishes Ad ust door and latch switches.
Operation of thermal cutout (Magnetron) Inform the customer Do not use any type of
Oven stops operation interlock switch
touching loose wiring of primary
Open or on the o en wall cookware with metallic trimming
Sparks
during cooking Metallic ware or cooking dishes Ad ust door and latch switches.
Inform the customer Do not use any type of
Sparks. operation
Oven stops interlock switch
touching on thermal wall
Operation ofthe o en cutout (Magnetron)
Ceramic ware trimmed with gold or cookware with metallic trimming
Sparks
during cooking sil er powder or cooking dishes
Metallic ware also causes sparks Inform the customer Do not use any type of
Operation ofthe o en cutout gold or
touching on thermal wall
Ceramic ware trimmed with (Magnetron) cookware with metallic trimming
Sparks sil er powder or cooking dishes
Metallic ware also causes sparks Inform the customer Do not use any type of
touching on the o en wall
Ceramic ware trimmed with gold or cookware with metallic trimming
Sparks sil er powder or cooking dishes
Metallic ware also causes sparks Inform the customer Do not use any type of
Ceramicintensity of microwagold or
Une en ware trimmed with e due
Uneven cooking touching on the o en wall Wrap thinner parts of the food with aluminum foil.
cookware with metallic trimming
Sparks sil its characteristics
Metallic ware also causes sparks
to er powder or cooking dishes Inform the customer Do not use any type of
Uneven cooking Ceramicintensity of microwagold or
Une en ware trimmed with e due
touching on the o en wall Wrap thinner parts of the food with aluminum foil.
cookware with metallic trimming
Sparks sil its characteristics
to er powder also causes sparks se plastic wrap or co er with a lid.
Uneven cooking.
Uneven cooking Ceramicintensity of microwagold or
Une en ware trimmed with e due Wrap thinner parts of the food with aluminum foil.
sil its characteristics
to er powder also causes sparks se plastic wrap or co er with a lid.
Une en intensity of microwa e due Stir once or twice while cooking foods such as
Uneven cooking Wrap thinner parts of the food with aluminum foil.
to its characteristics se plastic wrap milk.
soup, cocoa, or or co er with a lid.
Stir once or twice while cooking foods such as
Uneven cooking Une en intensity of microwa e due Wrap cocoa, parts of
soup, thinner or or co the food with aluminum foil.
se plastic wrap milk. er with a lid.
to its characteristics Stir once or twice while cooking foods such as
Uneven cooking Une en intensity of microwa e due Wrap cocoa, parts of
soup, thinner or milk. the food with aluminum foil.
Noise from the to its characteristics Stirplastic or twice while cooking foods such as
se once wrap or co er with a lid.
turntable motor when Noise may result from the motor soup, cocoa, or milk.
Replace turntable motor.
Noise from the
it starts to operate. se plastic wrap or co er with a lid.
Stir once or twice while cooking foods such as
turntable motor when Noise may result from the motor Replace turntable motor.
soup, cocoa, or milk.
Noise from the
it starts to operate. Stir once or twice while cooking foods such as
turntable motor when Noise may result from the motor Replace turntable motor.
soup, cocoa, or milk.
Noise from the
it starts to operate.
Noise from the turntable
turntable motor when motor when itfrom the motor operate.
Noise may result starts to Replace turntable motor.
it starts to operate.
Noise from the
turntable motor when Noise may result from the motor Replace turntable motor.
Noise from the
it starts to operate.
turntable motor when Noise may result from the motor Replace turntable motor.
it starts to operate.

30
5. Troubleshooting

5-2 Error Code List

Gas Sensor
Error Code Cause and conuntermeasure
-SE- Key short error(10 sec.). Replace assy control panel or smart board.
Sensor open error. Check unplugged sensor, wiring or smart board. If necessary, replace
E-11
sensor. If error code appears when starting sensor function, replace smart board.
Sensor short error. Check shorted sensor or smart board.
E-12 If necessary, replace sensor. If error code appears when starting sensor function, replace smart
board.
Sensor T1 max time error. Check sensor.
E-13 If necessary, replace sensor. If error code appears when starting sensor function, replace smart
board.

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