17
R -540DK
R-540DW
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
switch connector). 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 after the outer
case is installed.
8. Run the oven and check all functions.
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. 24.8V D.C.
Oven lamp / Turntable motor / Cooling fan motor
RY2
Approx. 23.9V 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 functions.
K
RELAY 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 Defrost pad and select compu Defrost. Then select Steaks/Chops/Fish.
L
COMPU DEFROST TEST
Set Up
Pasta
Grains
Beverage
Center
Frozen
Food
START
Vegetables
MINUTE
PLUS
Defrost
3+6
More from
Your
Microwave
Baked
Potatoes
Reheat
Poultry
Fish /
Seafood
Meat
Popcorn
STOP
CLEAR
G 1
G 5
G 6
G13
G12
G11
G15
G 2
G 3
G14
