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.
10.1. Primary latch switch,
secondary (secondary latch
switch and power relay B)
interlocks.
1. Unplug the lead connectors to Power Relay B and verify
continuity of the power relay B 1-2 terminals.
2. Unplug lead connectors to Primary Latch Switch and
Secondary Latch 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.
10.2. 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.
10.3. 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.
10.4. 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.
10 COMPONENT TEST PROCEDURE
18
NN-S262SF / NN-S262BF / NN-S262WF / NN-S252BF / NN-S252WF
Summary of Contents for NNS252BF - MICROWAVE OVEN/OTR
Page 2: ...2 NN S262SF NN S262BF NN S262WF NN S252BF NN S252WF ...
Page 3: ...3 NN S262SF NN S262BF NN S262WF NN S252BF NN S252WF ...
Page 6: ...3 CONTROL PANEL CPH 6 NN S262SF NN S262BF NN S262WF NN S252BF NN S252WF ...
Page 9: ...5 SCHEMATIC DIAGRAM APH 9 NN S262SF NN S262BF NN S262WF NN S252BF NN S252WF ...
Page 10: ...6 SCHEMATIC DIAGRAM CPH 10 NN S262SF NN S262BF NN S262WF NN S252BF NN S252WF ...
Page 27: ...14 EXPLODED VIEW AND PARTS LIST 27 NN S262SF NN S262BF NN S262WF NN S252BF NN S252WF ...
Page 34: ...34 NN S262SF NN S262BF NN S262WF NN S252BF NN S252WF ...
