Service manual

R-55TS-F
19
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
4.7K
A
B
C
R50
R51
R52
R53
4.7K
100K
100K
4321
11
10
9
5 6
WH-B
13P HARNESS
12
7 8
Switch Unit
BAKE
MICRO
SW1
ENCODER
TOAST
SW13
BAKE
SW9
REHEAT
SW5
START/
MINUTEPLUS
SW1
SW2
STOP/
CLEAR
TIMER/
CLOCK
SW6
SW10
SNACKS
SW14
SW15
POP-
CORN
SW7
FROZEN
ENTREE
SW8
GRILL
SW11
EXPRESS
DEFROST
SW3
BEVERAGE
SW12
FRESH
VEGETABLES
SW4
O 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 Pin Nos. 1 and 3 of the 7 pin connector (A) on the
control unit with an A.C. voltmeter.
The meter should indicate 120 volts, if not check oven circuit.
Shut off, Cook and Heater 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, grill cooking
operation, or bake 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. 24.2V D.C. Oven lamp/ Turntable motor
RY2 Approx. 23.4V D.C. Power transformer
RY3 Approx. 23.4V D.C. Upper heater
RY4 Approx. 23.4V D.C. Lower heater
RY5 Approx. 24.2V D.C. Fan motor
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.
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 “ Express Defrost “ pad once and touch the "START" pad.
(3) The oven is in Express Defrost cooking condition.
(4) The oven will operate as follows
WEIGHT
1ST STAGE 2ND STAGE 3RD STAGE 4TH STAGE
LEVEL TIME LEVEL TIME LEVEL TIME LEVEL TIME
0.5lb 70% 1min. 2sec. 0% 1min. 2sec. 50% 32sec. 30% 50sec.
(5) If improper operation is indicated, the control unit is probably defective and should be checked.
P EXPRESS DEFROST TEST
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.