Sharp Carousel R-1405, Carousel R-1406, Service Manual

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R-1405
R-1406
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
7. After that procedure, re-connect the power supply cord.
8. Check voltage between normal open terminal of the relay RY2 and the normal open 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, RY2, RY4, and RY5 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. 26.6V D.C. Oven lamp / Fan motor / Turntable motor
RY2(COOK) Approx. 26.0V D.C. Power transformer
RY4 Approx. 26.6V D.C. Hood motor
RY5 Approx. 26.6V D.C. Hood lamp
9. Disconnect the power supply cord.
10. Open the door and block it open.
11. To discharge high voltage capacitor, wait for 60 seconds.
12. Reconnect all leads removed from components during testing.
13. Re-install the hood intake duct R.
14. Re-install the outer case (cabinet).
15. Reconnect the power supply cord after the outer case is installed.
16. Run the oven and check all functions.
O DEFROST CENTER TEST
(1) Open the door.
(2) Place one cup of water in the center of the turntable tray in the oven cavity.
(3) Close the door.
(4) Touch the " DEFROST" pad once.
(5) Touch the number pad "2".
(6) Touch the number pad "5".
(7) Touch the " START " button.
(8) The oven is in Defrost center cooking condition.
(9) The oven will operate as follows.
Menu 1ST STAGE 2ND STAGE
Steaks/Chops
LEVEL TIME LEVEL TIME
0.5lbs 60% 57sec. 40% 17sec.
(8) If improper operation is indicated, the control unit is probably defective and should be checked.
To protect the electronic circuits, this model is provided with a fine foil pattern added to the primary on the
PWB, this foil pattern acts as a fuse.
1. Foil pattern check and repairs.
1) Disconnect the power supply cord.
2) Open the door and block it open.
3) To discharge high voltage capacitor, wait for 60 seconds.
4) Remove the control unit, referring to the procedure of " CONTROL PANEL ASSEMBLY, CONTROL
UNIT AND KEY UNIT REMOVAL ".
5) Follow the troubleshooting guide given below for repair.
P FOIL PATTERN ON THE PRINTED WIRING BOARD TEST