Sharp R-308CK Service Manual page 18

R-3 0 8CK
R-308CW
R -310 CK
R-310CW
PROCEDURE
LETTER
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 9
G10
Frozen
G11
entrees
G12 BEVERAGE
G13
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
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 twice.
(3) Touch the Number pad " 5 " and then touch the " START " pad.
(4) The oven is in Compu Defrost cooking condition.
(5) The oven will operate as follows
TEST PROCEDURES
G 8 G 7 G 6 G 5 G 4 G 3
MINUTE
3 2 1
5 4
PLUS
Fresh
0 9 8 7 6
vegetables
Timer
Power
Casserole
POPCORN START
Level Clock
Stop Baked Frozen
Clear potatoes vegetables
R-308CK/CW
OPERATIONAL VOLTAGE
RY1 Approx. 11.8V D.C.
RY2 Approx. 10.7V D.C.
1ST STAGE
WEIGHT
LEVEL
0.5lb 60%
COMPONENT TEST
G 2 G 1 G 8
Rolls/
5
G 9
muffins
0
G10
COMPU Dinner Frozen
G11
DEFROST entrees
Plate
G12 BEVERAGE
G13
G14
control unit is defective.
Oven lamp / Turntable motor / Cooling fan motor
Power transformer
2ND STAGE
TIME LEVEL TIME
42sec. 40% 32sec.
16
G 7 G 6 G 5 G 4 G 3
MINUTE
3 2 1
4
PLUS
Fresh Microwave
9 8 7 6
vegetables
Power Timer COMPU
Casserole POPCORN START
Level
Clock DEFROST
Stop Frozen
Baked
Clear potatoes vegetables
R-310CK/CW
CONNECTED COMPONENTS
G 2 G 1
Rolls/
muffins
pizza
Dinner
Plate
Ground
meat