Sharp R-520DK Service Manual page 19

PROCEDURE
LETTER
the above method may be used (after clearing the control unit) to determine if the control unit or key
pad is at fault.
5. Reconnect all leads removed from components during testing.
6. Re-install the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
G 8
5
G 9
0
G10
MINUTE
G11
PLUS
FROZEN
ROLLS &
G12
MUFFINS
GROUND MEAT
G13
(COMPU DEFROST)
G14
K RELAY TEST
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the leads to the primary of the power transformer.
5. Ensure that these leads remain isolated from other components and oven chassis by using insulation
tape.
6. After that procedure, re-connect the power supply cord.
7. Remove the outer case and check voltage between Pin No. 1 of the 2 pin connector (A) and the
common terminal of the relay RY1 on the control unit with an A.C. voltmeter.
The meter should indicate 120 volts, if not check oven circuit.
RY1 and RY2 Relay Test
These relays are operated by D.C. voltage
Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation.
DC. voltage indicated ................. Defective relay.
DC. voltage not indicated ........... Check diode which is connected to the relay coil. If diode is good,
RELAY SYMBOL
RY1
RY2
8. Disconnect the power supply cord, and then remove outer case.
9. Open the door and block it open.
10. Discharge high voltage capacitor.
11. Reconnect all leads removed from components during testing.
12. Re-install the outer case (cabinet).
13. Reconnect the power supply cord after the outer case is installed.
14. Run the oven and check all functions.
L COMPU DEFROST TEST
WARNING : The oven should be fully assembled before following procedure.
(1) Place one cup of water in the center of the turntable tray in the oven cavity.
(2) For R-520DK/DW, close the door, touch the " STEAKS / CHOPS " pad once.
For R-530DK/DW, close the door, touch the Compu Defrost pad thtee times and touch the number
pad 5. And then touch the Start pad.
TEST PROCEDURES
G 7 G 6 G 5 G 4 G 3
CHICKEN
3 2 1
4
PIECES
STEAKS/
9 8 7 6
CHOPS
CHICKEN KITCHEN
CLOCK
START
BREAST
TIMER
FRESH
STOP
POWER FRESH
BEVERAGE ROLLS &
CLEAR LEVEL VEGETABLES
MUFFINS
CUSTOM FROZEN REHEAT
HELP ENTREES SENSOR
R-520DK/DW
OPERATIONAL VOLTAGE
Approx. 24.0V D.C.
Approx. 23.0V D.C.
COMPONENT TEST
G 8
G 2 G 1
5
G 9
BAKED 0
G10
POPCORN
POTATOES
Minute
FROZEN
G11
RICE
Plus
VEGETABLES
One Dish
GROUND MEAT
FISH/
G12
Dinners
(SENSOR COOK)
SEAFOOD
G13 Popcorn
G14
control unit is defective.
CONNECTED COMPONENTS
Oven lamp / Turntable motor / Cooling fan motor
Power transformer
17
G 7 G 6 G 5 G 4 G 3
Beverage
3 2 1
4
center
Compu
9 8 7 6
Defrost
Start
Frozen Kitchen
Clock
snacks Timer Touch On
Stop Power Breakfast Fish/
Lunch on
Clear Level seafood vegetables
the Run Bar
Sensor Baked Custom Super
potatoes
reheat Help Defrost
R-530DK/DW
R -520DK
R-520DW
R -530DK
R-530DW
G 2 G 1
Fresh
Rice
vegetables
Ground
Poultry
meat
Frozen Frozen
entrees