DOWNLOAD Sharp R-86STM (serv.man8) Service Manual ↓ Size: 191.35 KB | Pages: 5 in PDF or view online for FREE

Model
R-86STM (serv.man8)
Pages
5 Few pages! See other manuals at the bottom of the first or last page.
Size
191.35 KB
Type
PDF
Document
Service Manual
Brand
Device
Home Appliance / Microwave Oven / Test Procedures
File
r-86stm-sm8.pdf
Date

Sharp R-86STM (serv.man8) Service Manual ▷ View online

R86STM
8 – 5
[15] O: RELAY TEST
CARRY OUT 3D CHECKS.
Remove the outer case and check voltage between Pin Nos. 5 and 7 of the 4 pin connector (E) on the control unit with an A.C. voltmeter. The meter
should indicate 230-240 volts, if not check oven circuit.
Relay Test
Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation, grill operation, convection operation or dual operation.
        DC. voltage indicated ................................... Defective relay.
        DC. voltage not indicated ............................. Check diode which is connected to the relay coil. If diode is good, control unit is defective.
CARRY OUT 4R CHECKS.
[16] P: PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING
BOARD (PWB) IS OPEN
Problem: POWER ON, indicator does not light up.
CARRY OUT 3D CHECKS.
NOTE: *At the time of these repairs, make a visual inspection of the varistor for burn-
ing damage and examine the transformer with tester for the presence of layer
short circuit (check primary coil resistance).
If any abnormal condition is detected, replace the control unit.
CARRY OUT 4R CHECKS.
RELAY SYMBOL
OPERATIONAL VOLTAGE
CONNECTED COMPONENTS
RY1
APPROX. 18.0V D.C.
Oven lamp / Turntable motor
RY2
APPROX. 18.0V D.C.
High voltage transformer
RY3
APPROX. 24.0V D.C.
Grill (Top) heating element
RY4
APPROX. 24.0V D.C.
Bottom heating element
RY5
APPROX. 24.0V D.C.
Touch control transformer
RY6
APPROX. 24.0V D.C.
Fan motor
RY7
APPROX. 24.0V D.C.
Convection motor
STEPS
OCCURRENCE
CAUSE OR CORRECTION
1
The rated AC voltage is not present between Pin Nos. 5 and 7 of 
the 4-pin connector (E).
Check supply voltage and oven power cord.
2
The rated AC voltage is present at primary side of low voltage 
transformer.
Low voltage transformer or secondary circuit defective.
Check and replace the touch control transformer or the control unit.
3
Pattern at “a” is broken.
Replace the control unit. 
(CARRY OUT 3D CHECKS BEFORE REPAIR)
a
7
JP0
S1
CN-A
R86STM
8 – 5
[15] O: RELAY TEST
CARRY OUT 3D CHECKS.
Remove the outer case and check voltage between Pin Nos. 5 and 7 of the 4 pin connector (E) on the control unit with an A.C. voltmeter. The meter
should indicate 230-240 volts, if not check oven circuit.
Relay Test
Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation, grill operation, convection operation or dual operation.
        DC. voltage indicated ................................... Defective relay.
        DC. voltage not indicated ............................. Check diode which is connected to the relay coil. If diode is good, control unit is defective.
CARRY OUT 4R CHECKS.
[16] P: PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING
BOARD (PWB) IS OPEN
Problem: POWER ON, indicator does not light up.
CARRY OUT 3D CHECKS.
NOTE: *At the time of these repairs, make a visual inspection of the varistor for burn-
ing damage and examine the transformer with tester for the presence of layer
short circuit (check primary coil resistance).
If any abnormal condition is detected, replace the control unit.
CARRY OUT 4R CHECKS.
RELAY SYMBOL
OPERATIONAL VOLTAGE
CONNECTED COMPONENTS
RY1
APPROX. 18.0V D.C.
Oven lamp / Turntable motor
RY2
APPROX. 18.0V D.C.
High voltage transformer
RY3
APPROX. 24.0V D.C.
Grill (Top) heating element
RY4
APPROX. 24.0V D.C.
Bottom heating element
RY5
APPROX. 24.0V D.C.
Touch control transformer
RY6
APPROX. 24.0V D.C.
Fan motor
RY7
APPROX. 24.0V D.C.
Convection motor
STEPS
OCCURRENCE
CAUSE OR CORRECTION
1
The rated AC voltage is not present between Pin Nos. 5 and 7 of 
the 4-pin connector (E).
Check supply voltage and oven power cord.
2
The rated AC voltage is present at primary side of low voltage 
transformer.
Low voltage transformer or secondary circuit defective.
Check and replace the touch control transformer or the control unit.
3
Pattern at “a” is broken.
Replace the control unit. 
(CARRY OUT 3D CHECKS BEFORE REPAIR)
a
7
JP0
S1
CN-A
R86STM
8 – 5
[15] O: RELAY TEST
CARRY OUT 3D CHECKS.
Remove the outer case and check voltage between Pin Nos. 5 and 7 of the 4 pin connector (E) on the control unit with an A.C. voltmeter. The meter
should indicate 230-240 volts, if not check oven circuit.
Relay Test
Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation, grill operation, convection operation or dual operation.
        DC. voltage indicated ................................... Defective relay.
        DC. voltage not indicated ............................. Check diode which is connected to the relay coil. If diode is good, control unit is defective.
CARRY OUT 4R CHECKS.
[16] P: PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING
BOARD (PWB) IS OPEN
Problem: POWER ON, indicator does not light up.
CARRY OUT 3D CHECKS.
NOTE: *At the time of these repairs, make a visual inspection of the varistor for burn-
ing damage and examine the transformer with tester for the presence of layer
short circuit (check primary coil resistance).
If any abnormal condition is detected, replace the control unit.
CARRY OUT 4R CHECKS.
RELAY SYMBOL
OPERATIONAL VOLTAGE
CONNECTED COMPONENTS
RY1
APPROX. 18.0V D.C.
Oven lamp / Turntable motor
RY2
APPROX. 18.0V D.C.
High voltage transformer
RY3
APPROX. 24.0V D.C.
Grill (Top) heating element
RY4
APPROX. 24.0V D.C.
Bottom heating element
RY5
APPROX. 24.0V D.C.
Touch control transformer
RY6
APPROX. 24.0V D.C.
Fan motor
RY7
APPROX. 24.0V D.C.
Convection motor
STEPS
OCCURRENCE
CAUSE OR CORRECTION
1
The rated AC voltage is not present between Pin Nos. 5 and 7 of 
the 4-pin connector (E).
Check supply voltage and oven power cord.
2
The rated AC voltage is present at primary side of low voltage 
transformer.
Low voltage transformer or secondary circuit defective.
Check and replace the touch control transformer or the control unit.
3
Pattern at “a” is broken.
Replace the control unit. 
(CARRY OUT 3D CHECKS BEFORE REPAIR)
a
7
JP0
S1
CN-A
R86STM
8 – 5
[15] O: RELAY TEST
CARRY OUT 3D CHECKS.
Remove the outer case and check voltage between Pin Nos. 5 and 7 of the 4 pin connector (E) on the control unit with an A.C. voltmeter. The meter
should indicate 230-240 volts, if not check oven circuit.
Relay Test
Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation, grill operation, convection operation or dual operation.
        DC. voltage indicated ................................... Defective relay.
        DC. voltage not indicated ............................. Check diode which is connected to the relay coil. If diode is good, control unit is defective.
CARRY OUT 4R CHECKS.
[16] P: PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING
BOARD (PWB) IS OPEN
Problem: POWER ON, indicator does not light up.
CARRY OUT 3D CHECKS.
NOTE: *At the time of these repairs, make a visual inspection of the varistor for burn-
ing damage and examine the transformer with tester for the presence of layer
short circuit (check primary coil resistance).
If any abnormal condition is detected, replace the control unit.
CARRY OUT 4R CHECKS.
RELAY SYMBOL
OPERATIONAL VOLTAGE
CONNECTED COMPONENTS
RY1
APPROX. 18.0V D.C.
Oven lamp / Turntable motor
RY2
APPROX. 18.0V D.C.
High voltage transformer
RY3
APPROX. 24.0V D.C.
Grill (Top) heating element
RY4
APPROX. 24.0V D.C.
Bottom heating element
RY5
APPROX. 24.0V D.C.
Touch control transformer
RY6
APPROX. 24.0V D.C.
Fan motor
RY7
APPROX. 24.0V D.C.
Convection motor
STEPS
OCCURRENCE
CAUSE OR CORRECTION
1
The rated AC voltage is not present between Pin Nos. 5 and 7 of 
the 4-pin connector (E).
Check supply voltage and oven power cord.
2
The rated AC voltage is present at primary side of low voltage 
transformer.
Low voltage transformer or secondary circuit defective.
Check and replace the touch control transformer or the control unit.
3
Pattern at “a” is broken.
Replace the control unit. 
(CARRY OUT 3D CHECKS BEFORE REPAIR)
a
7
JP0
S1
CN-A
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