Sharp R-430CK Service Manual page 19

PROCEDURE
LETTER
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.
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
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) Close the door, touch the " Compu Defrost " pad three times and touch the number pad 5. And then
touch the start pad.
(3) The oven is in Compu Defrost cooking condition.
(4) The oven will operate as follows
TEST PROCEDURES
G 8 G 7 G 6
5 3
4
G 9
0 9 8
G10
Kitchen
Frozen
Minute
G11
Clock
Plus Snacks
One Dish Lunch on
Stop
G12
Dinners the Run
Clear
Baked
Custom
Sensor
Popcorn
G13
Potatoes
Reheat
G14
Key Unit
control unit is defective.
OPERATIONAL VOLTAGE
RY1 Approx. 24.3V D.C.
RY2 Approx. 23.4.V D.C.
1ST STAGE
WEIGHT
LEVEL TIME
0.5lb 60% 27sec.
COMPONENT TEST
G 5 G 4 G 3 G 2 G 1
Beverage
2 1
Center
COMPU
Fresh
7 6
Rice
Vegetables
DEFROST
Start
Ground
Poultry
Touch On Meat
Timer
Power Frozen Frozen
Breakfast Fish/
Vegetables entrees
Level
Bar Seafood
Super
Help Defrost
CONNECTED COMPONENTS
Oven lamp / Turntable motor / Cooling fan motor
Power transforme
2ND STAGE
LEVEL TIME
40% 17sec.
17
R-430CK
R-430CW
R-430CD