16
R-305BW
R-309BW
(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 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.
MODEL
WEIGHT
1ST STAGE
2ND STAGE
3RD STAGE
LEVEL
TIME
LEVEL
TIME
LEVEL
TIME
R-305BW
0.5lbs
70%
45sec.
50%
40sec.
30%
45sec.
R-309BW
0.5lbs
70%
40sec.
50%
38sec.
30%
43sec.
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 function.
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
R-305BW
R-309BW
5
4
3
2
1
0
9
8
7
6
STOP
CLEAR
TIMER
CLOCK
Fresh
Vegetable
Reheat
Casserole
COMPU
DEFROST
Popcorn
POWER
LEVEL
Beverage
Fresh
Roll /
Muffin
START
MINUTE
PLUS
Baked
Potato
G 8
G 7
G 6
G 5
G 4
G 3
G 2
G 1
G12
G11
G10
G 9
5
4
3
2
1
0
9
8
7
6
STOP
CLEAR
TIMER
CLOCK
Fresh
Vegetable
Reheat
Casserole
Dinner
Plate
COMPU
DEFROST
Popcorn
POWER
LEVEL
Beverage
Fresh
Roll /
Muffin
Frozen
Roll /
Muffin
START
MINUTE
PLUS
Baked
Potato
G 8
G 7
G 6
G 5
G 4
G 3
G 2
G 1
G12
G11
G10
G 9
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, control
unit is defective.
RELAY SYMBOL
OPERATIONAL VOLTAGE
CONNECTED COMPONENTS
RY1
Approx. 25.0V D.C.
Oven lamp / Turntable motor / Cooling fan motor
RY2
Approx. 24.0V D.C.
Power transformer
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 function.
K
RELAY TEST
L
COMPU DEFROST TEST
