Sharp R-21JV-F Service Manual page 18

R-21HT-F
R-21JV-F
PROCEDURE
LETTER
make sure the door sensing switch is closed (either close the door or short the door sensing switch
connecter). Use the Key unit matrix indicated on the control panel schematic and place a jumper wire
between the pins that correspond to the STOP/CLEAR pad making momentary contact. If the control
unit responds by clearing with a beep the key unit is faulty and must be replaced. If the control unit does
not respond, it is faulty and must be replaced. If a specific pad does not respond, 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.
G 9
G10
G11
G12
L 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 Pin Numbers. 3 and 7 of the connector (A) on the
control unit with an A.C. voltmeter.
The meter should indicate 120 volts, if not check oven circuit.
RY2 and RY3 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.
RELAY SYMBOL
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.
TEST PROCEDURES
G 1 G 2 G 3 G 4
7
8
9
0
R-21JV-F
DC. voltage indicated ....................... Defective relay.
DC. voltage not indicated ................. Check diode which is connected to the relay coil. If diode is good,
OPERATIONAL VOLTAGE
RY2 Approx. 12.0V D.C.
RY3 Approx. 12.0V D.C.
COMPONENT TEST
G 5 G 6 G 7 G 8
DOUBLE
START SET
QUANTITY
SELECTA EXPRESS STOP/
CHECK
TIME CLEAR
DEFROST
5 3 1
SIGNAL
6 4 2
G 1 G 2 G 3
G 9
G10
G11
G12
R-21HT-F
control unit is defective.
Power transformer
Oven lamp / Antenna motor / Cooling fan motor
16
G 4 G 5 G 6 G 7
17
DOUBLE
SELECTA
7
START
POWER QUANTITY
18
SELECTA EXPRESS STOP/
8
TIME DEFROST CLEAR
19 15 13 11
9 5 3 1
20 16 14 12
0 6 4 2
CONNECTED COMPONENTS
G 8
SET
CHECK
SIGNAL