15
R-310HK
R-310HW
2) Open the door and block it open.
3) Discharge high voltage capacitor.
4) Reconnect all leads removed from components during testing.
5) Re-install the outer case (cabinet).
6) Reconnect the power supply cord after the outer case is installed.
7) Run the oven and check all functions.
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
J
KEY UNIT 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.
Using an ohmmeter and referring to the key unit matrix indicated on the control unit circuit, check the circuit
between the pins of the key unit that correspond to the STOP/CLEAR pad. When the pad is pressed, the
ohmmeter should indicate short circuit. When the pad is released, the ohmmeter should indicate open
circuit. If incorrect readings are obtained, the key unit is faulty and must be replaced. About the other pads,
the above method may be used.
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.
Pin
NO. G12
Pin
NO. G1
Key unit ribbon cable
Key unit (Membrane Switch) front view
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 the normal open terminal of the relay RY1 and the
normal open terminal of the relay RY2 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. -12.0V D.C.
Oven lamp / Turntable motor / Cooling fan motor
RY2
Approx. -11.0V 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.
START
MINUTE PLUS
G6
G7
G8
G3
G10
G11
G12
G4
G5
G9
G2
G1
4
7
5
8
9
KEEP WARM
POPCORN
BAKED
POTATOES
RICE
1
3
6
2
0
REHEAT
FROZEN
VEGETABLES
FROZEN
ENTREES
FRESH
VEGETABLES
STEAKS/
CHOPS
GROUND
MEAT
BONE-IN
POULTRY
BONELESS
POULTRY
HOT WATER
TIMER
CLOCK
STOP
CLEAR
POWER
LEVEL
(DEFROST CENTER)
GROUND MEAT
