Sharp R-326FS Service Manual page 19

PROCEDURE
LETTER
5. Reconnect all leads removed from components during testing.
6. Re-install the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
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
tape.
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 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
RY1
RY2
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 DEFROST CENTER TEST
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 " DEFROST" pad once And then touch the number pad 2.
(3) Touch the number pad 5 and then touch the Start pad.
(4) The oven is in Defrost cooking condition.
(5) The oven will operate as follows
TEST PROCEDURES
COMPONENT TEST
G8 G7 G6
3
SENSOR
COOK
POWER
8 SENSOR
LEVEL
REHEAT
7
BEVERAGE
2
TIMER
1
CLOCK
control unit is defective.
OPERATIONAL VOLTAGE
Approx. 24.0V D.C.
Approx. 23.0V D.C.
17
G5 G4 G3
MINUTE
4 9
START
DEFROST POPCORN
FROZEN
ROLLS
MUFFINS
FRESH
ROLLS
MUFFINS
STOP/
6
CLEAR
CONNECTED COMPONENTS
Oven lamp / Turntable motor / Cooling fan motor
Power transformer
R- 326FS
G2 G1
5
PLUS
0