13
R-312AW
R-312AK
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
Remove the outer case and check voltage between Pin No. 3 of the 2 pin connector (A) and the common
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. 14.0 D.C.
Oven lamp / Turntable motor / Cooling fan motor
RY2
Approx. 12.8 D.C.
Power transformer
(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
WEIGHT
1ST STAGE
2ND STAGE
3RD STAGE
LEVEL
TIME
LEVEL
TIME
LEVEL
TIME
0.5lbs
70%
40sec.
50%
38sec.
30%
43sec.
(5) If improper operation is indicated, the control unit is probably defective and should be checked.
L
RELAY TEST
M
COMPU DEFROST TEST
c) Cooking is not possible.
Note: When defective components, the Power Unit or Key Unit are replaced, the defective part or parts
must be properly packed for return in the shipping carton, with its cushion material, in which the
new replacement part was shipped to you.
K
KEY UNIT TEST
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 (stop 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
(stop 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 a 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
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
