Sharp R-403KK Service Manual page 18

R - 4 0 5 K S
R - 4 0 3 K K
PROCEDURE
LETTER
G8 G7 G6
NIGHT
LIGHT
DEFROST
COOK
MELT
SOFTEN
R-403KK
K 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
6. After that procedure, re-connect the power supply cord.
7. Remove the outer case and check voltage between the normal open terminal of the relay RY1 and the
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.
L COMPU DEFROST TEST
WARNING : The oven should be fully assembled before following procedure.
(1) Open the door.
(2) Place one cup of water in the center of the turntable tray in the oven cavity
(3) Touch the " Defrost " pad once.
(4) Press "2", then press "5".
(5) Touch the "START " pad.
(6) The oven is in Defrost cooking condition.
(7) The oven will operate as follows
(8) If improper operation is indicated, the control unit is probably defective and should be checked.
TEST PROCEDURES
G5 G4 G3
2
REHEAT
START
TIMER
1
5
CLOCK
STOP
4
8
CLEAR
POWER
0
7
LEVEL
tape.
normal open terminal of the relay RY2 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,
RELAY SYMBOL OPERATIONAL VOLTAGE
RY1 Approx. 12.0V D.C.
RY2 Approx. 12.0V D.C.
MENU 1ST STAGE
STEAKS/CHOPS LEVEL
0.5lb 60%
COMPONENT TEST
G2 G1
WARM
9
MINUTE
3
PLUS
6
POPCORN
Key Unit
control unit is defective.
Oven lamp / Turntable motor / Cooling fan motor
Power transformer
2ND STAGE
TIME LEVEL TIME
20sec. 40% 20sec.
16
Pin Pin
NO. G1 NO. G13
Key unit (Membrane Switch) front view
CONNECTED COMPONENTS
3RD STAGE
LEVEL TIME
30% 45sec.
Key unit ribbon cable