9
R-1210
R-1211
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
2. Open the door and block it open.
3. To discharge high voltage capacitor, wait for 60 seconds.
4. If the display fails to clear when the STOP/CLEAR pad is depressed, first verify the flat ribbon cable
is making good contact, verify that the door sensing switch operates properly; that is the contacts are
closed when the door is closed and open when the door is open. If the door sensing switch is good,
disconnect the flat ribbon cable that connects the key unit to the control unit and make sure the door
sensing switch is closed (either close the door or short the door sensing switch connecter). Use the
Key unit matrix indicated on the control panel schematic and place a jumper wire between the pins
that correspond to the STOP/CLEAR pad making momentary contact. If the control unit responds by
clearing with a beep the key unit is faulty and must be replaced. If the control unit does not respond,
it is faulty and must be replaced. If a specific pad does not respond, 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.
8. Run the oven and check all functions.
L
RELAY TEST
1. Disconnect the power supply cord, and then remove outer case. Refer to procedure of “ REMOVAL
OF OVEN FROM WALL ” and “ OUTER CASE REMOVAL ”.
2. Open the door and block it open.
3. To discharge high voltage capacitor, wait for 60 seconds.
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. Check voltage between normal open terminal of the relay RY2 and the normal open 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, RY2, RY3 and RY4 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. -26.3V D.C.
Oven lamp / Fan motor / Turntable motor
RY2(COOK)
Approx. -25.3V D.C.
Power transformer
RY3
Approx. -26.3V D.C.
Hood lamp
RY4
Approx. -26.3V D.C.
Hood lamp
8. Disconnect the power supply cord.
9. Open the door and block it open.
G11
G12
G 9
G 8
POPCORN
BEVERAGE
SENSOR
REHEAT
CUSTOM
HELP
FRESH
VEGETABLES
POWER
LEVEL
BAKED
POTATOES
FRESH
ROLLS /
MUFFINS
FROZEN
ROLLS /
MUFFINS
SENSOR
COOK
CENTER
KEEP
WARM
PLUS
TIMER
CLOCK
HOT
WATER
DEFROST
CENTER
TASK
LIGHT
ACCENT
LIGHT
3
8
2
7
1
6
5
0
4
9
G 7
G 6
G 5
G 4
G 3
G 2
G 1
G10
STOP
CLEAR
START
MINUTE PLUS
