Monitor Switch Test; Fuse F10A Test - Sharp AX-1500J Service Manual

AX1500J(S)
8. Disconnect the wire leads from the fan thermal cut out.
9. Connect the ohmmeter to the red/red terminal of the convection heater and one of the terminal of the convection thermal cut-out. By doing so, the
state of the relay contacts using a ohmmeter can be checked. The meter should indicate an open circuit. Because the relay contacts should be
open. If the relay contacts are closed, replace the circuit board entirely or the relay itself.
10.Reconnect all leads removed from components during testing.
11.Reinstall the outer case and the back plate assembly.
12.Reconnect the power supply cord after the outer case and the back plate assembly are installed.
13.Run the oven and check all function.

[3] MONITOR SWITCH TEST

1. Disconnect the power supply cord, and then remove the outer case and the back
plate assembly.
2. Open the door and block it open.
3. Wait for 60 seconds to discharge the high voltage capacitors of the inverter unit.
4. Disconnect the high voltage wire from the magnetron terminal with insulated pli-
ers.
5. Make the terminal (metal part) of the high voltage wire contact to the magnetron
body with insulated pliers.
6. Now, the capacitors of the inverter unit are discharged.
7. Reconnect the high voltage wire to the magnetron terminal after discharging.
WARNING: Use the pliers that the portions of their handles are insulated completely to avoid an electric shock.
8. Before performing this test, make sure that the secondary interlock switch and the primary interlock relay are operating properly, according to the
above Switch Test Procedure. Disconnect the wire lead from the monitor switch (COM) terminal. Check the monitor switch operation by using the
ohmmeter as follows. When the door is open, the meter should indicate a closed circuit. When the monitor switch actuator is pushed by a screw
driver through the right latch hole on the front plate of the oven cavity with the door opened (in this condition the plunger of the monitor switch is
pushed in), the meter should indicate an open circuit. If improper operation is indicated, the switch may be defective. After testing the monitor
switch, reconnect the wire lead to the monitor switch (COM) terminal and check the continuity of the monitor circuit.
9. Reconnect all leads removed from components during testing.
10.Reinstall the outer case and the back plate assembly.
11.Reconnect the power supply cord after the outer case and the back plate assembly are installed.
12.Run the oven and check all function.

[4] FUSE F10A TEST

1. Disconnect the power supply cord, and then remove the outer case and the back plate assembly.
2. Open the door and block it open.
3. Wait for 60 seconds to discharge the high voltage capacitors of the inverter unit.
4. Disconnect the high voltage wire from the magnetron terminal with insulated pliers.
5. Make the terminal (metal part) of the high voltage wire contact to the magnetron body with insulated pliers.
6. Now, the capacitors of the inverter unit are discharged.
7. Reconnect the high voltage wire to the magnetron terminal after discharging.
WARNING: Use the pliers that the portions of their handles are insulated completely to avoid an electric shock.
8. If the fuse is blown when the door is opened, check the primary interlock relay, secondary interlock switch and monitor switch according to the
"TEST PROCEDURE" for those switches before replacing the blown fuse.
CAUTION: BEFORE REPLACING A BLOWN FUSE, TEST THE PRIMARY INTERLOCK RELAY, SECONDARY INTERLOCK SWITCH, DOOR
SENSING SWITCH AND MONITOR SWITCH FOR PROPER OPERATION.
9. Reconnect all leads removed from components during testing.
10.Reinstall the outer case and the back plate assembly.
11.Reconnect the power supply cord after the outer case and the back plate assembly are installed.
12.Run the oven and check all function.
MONITOR
SWITCH
6 – 3
N.C.
COM.