Sharp R-1405 Service Manual page 22

R-1405
R-1406
PROCEDURE
LETTER
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, RY2, RY4, and RY5 Relay Test
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.
(8) If improper operation is indicated, the control unit is probably defective and should be checked.
P FOIL PATTERN ON THE PRINTED WIRING BOARD TEST
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.
TEST PROCEDURES
RY1 on the control unit with an A.C. voltmeter.
The meter should indicate 120 volts, if not check oven circuit.
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
RELAY SYMBOL OPERATIONAL VOLTAGE
RY1 Approx. 26.6V D.C.
RY2(COOK) Approx. 26.0V D.C.
RY4 Approx. 26.6V D.C.
RY5 Approx. 26.6V D.C.
Menu 1ST STAGE
LEVEL
Steaks/Chops
0.5lbs 60% 57sec.
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.
COMPONENT TEST
is good, control unit is defective.
Oven lamp / Fan motor / Turntable motor
Power transformer
Hood motor
Hood lamp
2ND STAGE
TIME LEVEL TIME
40% 17sec.
20
CONNECTED COMPONENTS