17
DMO2420B
DMO2420R
DMO2420S
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
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.
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. 24.0V D.C. Oven lamp / Turntable motor / Cooling fan motor
RY2 Approx. 23.0V 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 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 Auto Defrost pad and touch the number pad 5. And touch the number pad
5 again. And then touch the Start pad.
(3) The oven is in Auto Defrost cooking condition.
(4) The oven will operate as follows.
L COMPU DEFROST TEST
G 1 G 2 G 3 G 4 G 5 G 6 G 7 G 8
G 9
G10
G11
G12
G13
G14
FRESH
VEGETABLES
BEVERAGE
BREAKFAST
LUNCH
POPCORN
SNACKS
MICROWAVE
RECIPES
START
INSTANT ON
FISH
SEAFOOD
POWER
LEVEL
KEEP
WARM
15
MINUTE
DINNER
AUTO
DEFROST
HELP
GUIDE
BAKED
POTATOES
REHEAT
EASY
MINUTE
VEGETABLES
RICE
1
6
2
7
3
8
4
9
5
0
POULTRY
GROUND
MEAT
ENTREES
TIMER
CLOCK
STOP
CLEAR
To Next Page
Loading...
Need help?
General
