Panasonic NN-V659WB, Руководство по обслуживанию

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7. COMPONENT TEST PROCEDURE
7.1 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.
7.2 Short Switch & Monitor Circuit
1. Unplug lead wires from H.V. Inverter primary terminals.
2. Connect test probes of ohm meter to the disconnected leads
which were connected to H.V. Inverter.
2. 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.
7.3 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.
7.4 Push button key board
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 (schematic).
CAUTION
1. High voltage is present at the high voltage terminal of the
High Voltage Inverter(U) including aluminium 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.
Door Opened Door Closed
Primary Latch Switch
Ω
(open) 0
Ω
(close)
Secondary Latch Switch
Ω
(open) 0
Ω
(close)
Power Relay B
Ω
(open)
Ω
(close)
Door Opened Door Closed
0 Ω Ω
NEW H.V.
NEW H.V.
ANTENNA
COOLING FIN
MAGNETRON
ANTENNA
04-031M
Ω
FILAMENT
TERMINALS HIGHEST
OHM
SCALE
0
Ω − 1 Ω
RX1
SCALE
CASE
GASKET