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 1-2terminals.
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.
Door Closed
Door Opened
Primary Latch switch
0
Ω
(Close)
Ω
(Open)
Door Switch
0
Ω
(Close)
Ω
(Open)
Power Relay B
Ω
(Close)
Ω
(Open)
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 which 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
0
Ω
Ω
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.
5.4. Membrane key board
(Membrane switch assembly)
Check continuity between switch terminals, by tapping an
appropriate pad on the key board. The contacts assignment of
the respective pads on the key board is as shown in digital
programmer circuit. (Refer to Mini Manual)
5 COMPONENT TEST PROCEDURE
16
NN-T695 NN-T685SF
Summary of Contents for INVERTER NN-H665
Page 2: ...2 NN T695 NN T685SF ...
Page 3: ...3 NN T695 NN T685SF ...
Page 5: ...1 SCHEMATIC DIAGRAM 1 1 APH 5 NN T695 NN T685SF ...
Page 6: ...1 2 CPH 6 NN T695 NN T685SF ...
Page 7: ...1 3 RPH 7 NN T695 NN T685SF ...
Page 24: ...9 EXPLODED VIEW AND PARTS LIST 9 1 EXPLODED VIEW 24 NN T695 NN T685SF ...
Page 35: ...10 DIGITAL PROGRAMMER CIRCUIT 10 1 NN T695SF APH CPH T695SF SM RPH 35 NN T695 NN T685SF ...
Page 36: ...36 NN T695 NN T685SF ...
Page 37: ...10 2 NN T685SF APH CPH T675SF APH 37 NN T695 NN T685SF ...
Page 38: ...38 NN T695 NN T685SF ...
Page 39: ...10 3 NN T665SF APH T655SF APH T664SFR APH 39 NN T695 NN T685SF ...
Page 40: ...40 NN T695 NN T685SF ...
Page 41: ...10 4 NN H665 APH CPH H635 APH S655 APH S645 APH S615 CPH 41 NN T695 NN T685SF ...
Page 42: ...42 NN T695 NN T685SF ...
Page 44: ...44 NN T695 NN T685SF ...
