9
R-1880LS/LST
1. Disconnect the power supply cord, and then remove outer case.
. 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. 5 of the 3-pin connector (A) and the common
terminal of the relay RY1 on the control unit with an A.C. voltmeter. The meter should indicate 10 volts, if
not check oven circuit.
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. 4.0V D.C.
Oven lamp
RY(COOK)
Approx. 4.0V D.C.
Power transformer / Stirrer mootor
RY3
Approx. 4.0V D.C.
Heating element
RY4
Approx. 4.0V D.C.
Turntable motor
RY5
Approx. 4.0V D.C.
Fan motor
RY6
Approx. 4.0V D.C.
Damper motor
RY7
Approx. 4.0V D.C.
Convection motor
RY8
Approx. 4.0V D.C.
Hood lamp
RY9
Approx. 4.0V D.C.
Hood motor
RY10
Approx. 4.0V D.C.
Hood motor (HIGH / LOW selection)
T
TIMED DEFROST TEST
1. Place one cup of water in the center of the turntable tray in the oven cavity.
. Close the door, touch the " DEFROST " pad four times.
3. Touch the number 5 pad.
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
S
RELAY TEST
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.
1. 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.
4. Touch " START " pad.
5. The oven will operate as follows.
MENU
WEIGHT
1ST STAGE
ND STAGE
3RD STAGE
(LBS)
LEVEL TIME
LEVEL
TIME
LEVEL
TIME
CHICKEN
0.5
70%
8sec.
50%
5sec.
30%
1min.8sec.
PIECES
6. If improper operation is indicated, the control unit is probably defective and should be checked.
Содержание R-1880LS
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Страница 50: ...50 R 1880LS LST 6 4 5 1 2 3 6 4 5 1 2 3 A B C D E F G H A B C D E F G H Figure S 2 Touch Control Panel Circuit ...
Страница 51: ...51 R 1880LS LST 6 4 5 1 2 3 6 4 5 1 2 3 A B C D E F G H A B C D E F G H Figure S 3 Printed Wiring Board ...
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Страница 59: ...59 R 1880LS LST NOTES ...