Sharp R-310BK, Service Manual

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16
R-310BK
R-310BW
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 " COMPU DEFROST " pad twice and touch the Number pad "5". And then
touch the "START" pad.
(3) The oven is in Compu Defrost cooking condition.
(4) The oven will operate as follows
WEIGHT 1ST STAGE 2ND STAGE 3RD STAGE
LEVEL TIME LEVEL TIME LEVEL TIME
0.5lb 50% 27sec. 30% 60sec. 10% 50sec.
the above method may be used (after clearing the control unit) to determine if the control unit or key
pad is at fault.
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.
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT 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 Pin No. 1 of the 2 pin connector (A) and the
common 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 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, control unit is defective.
RELAY SYMBOL OPERATIONAL VOLTAGE CONNECTED COMPONENTS
RY1 Approx. 25.0V D.C. Oven lamp / Turntable motor / Cooling fan motor
RY2 Approx. 24.0V D.C. Power transformer
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.
K RELAY TEST
L COMPU DEFROST TEST
G 8 G 7
5 4 3
POPCORN
2 1
0 9 8 7 6
START
MINUTE
PLUS
POWER
LEVEL
BAKED
POTATO
DINNER
PLATE
TIMER
CLOCK
COMPU
DEFROST
BEVERAGE
FROZEN
ROLL/
MUFFIN
FRESH
ROLL/
MUFFIN
FRESH
VEGETABLE
REHEAT
CASSEROLE
G 6 G 5 G 4 G 3 G 2 G 1
G12
G11
G10
G 9
STOP
CLEAR