Component Test Procedure; Primary Latch Switch (Door Switch And Power Relay B) Interlocks; Short Switch & Monitor - Panasonic NN­GS595A Service Manual

10/24/2016
5 COMPONENT TEST PROCEDURE
CAUTION NEW. H.V.
1. High voltage is present at the high voltage terminal of the High Voltage Inverter (U) including aluminum heat sink during any
cook cycle.
2. It is neither necessary nor advisable to attempt measurement of the high voltage.
3. Before touching any oven components, or wiring, always unplug the oven from its power source and discharge the high voltage
capacitors.
5.1 Primary latch switch (door switch and power relay
B) interlocks
1. Unplug lead connectors to Power Relay B and verify open circuit of the power relay B 1­2 terminals.
2. Unplug lead connectors to Primary Latch Switch and Door Switch.
3. Test the continuity of switches at door opened and closed positions with ohm meter (low scale).
Normal continuity readings should be as follows.
Primary Latch switch 0Ω (Close)
Door Switch
Power Relay B
5.2 Short switch & monitor
1. Unplug lead wires from Inverter Power Supply (U) primary terminals.
2. Connect test probes of ohm meter to the disconnected leads that were connected to Inverter Power Supply (U).
3. Test the continuity of short switch with door opened and closed positions using lowest scale of the ohm meter.
Normal continuity readings should be as follows.
Door Opened Door Closed
0Ω
5.3 Magnetron
Continuity checks can only indicate an open filament or a shorted magnetron. To diagnose for an open filament or shorted
magnetron.
1. Isolate magnetron from the circuit by disconnecting the leads.
2. A continuity check across magnetron filament terminals should indicate one ohm or less.
3. A continuity check between each filament terminal and magnetron case should read open.
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Door Closed Door Opened
Ω(Open)
Ω(Open)
0Ω (Close)
Ω (Close) Ω(Open)
Ω
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