Test Procedures - Sharp R-7500AT Service Manual

[1] INTERLOCK SWITCH -1 AND/OR -2 TEST
1.Disconnect the power supply cord, and then remove outer case.
2.Open the door full assy and block it open.
3.Wait for 60 seconds to discharge the high voltuge capacitor of the inverter unit.
4.Isolate the switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminal
of the switch. The meter should indicate an open circuit with the door open and a closed circuit with
the door closed. If improper operation is indicated, replace the secondary interlock switch.
5.Reconnect all leads removed from components during testing.
6.Reinstall the outer case (cabinet).
7.Reconnect the power supply cord after the outer case are installed.
8.Run the oven and check all functions.
[2] INTERLOCK SYSTEM TEST
1. DOOR SENSING SWITCH
1.Disconnect the power supply cord, and then remove outer case.
2.Open the door full assy and block it open.
3.Wait for 60 seconds to discharge the high voltuge capacitor of the inverter unit.
4. Isolate the switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminal
of the switch. The meter should indicate an open circuit with the door open and a closed circuit with
the door closed. If improper operation is indicated, replace the door sensing switch.
5.Reconnect all leads removed from components during testing.
6.Reinstall the outer case (cabinet).
7.Reconnect the power supply cord after the outer case are installed.
8. Run the oven and check all functions.
2. INTERLOCK RELAY RY1
1.Disconnect the power supply cord, and then remove outer case .
2.Open the door full assy and block it open.
3.Wait for 60 seconds to discharge the high voltuge capacitor of the inverter unit.
4.Disconnect two (2) wire leads from the male tab terminals of the Interlock Relay RY1. Check
the state of the relay contacts using a ohmmeter. The relay contacts should be open. If the relay
contacts are closed, replace the circuit board entirely .
5.Reconnect all leads removed from components during testing.

TEST PROCEDURES

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R-7500AT