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1-2 Special Servicing Precautions (Continued)
17. When checking the continuity of the witches or
transformer, always make sure that the power is
OFF, and one of the lead wires is disconnected.
18. Components that are critical for safety are indi-
cated in the circuit diagram by
shading,
or
19. Use replacement components that have the
same ratings, especially for fl ame resistance and
dielectric strength specifi cations. A replacement
part that does not have the same safety charac-
teristics as the original might create shock, fi re or
other hazards.
1-3 Special High Voltage Precautions
1. High Voltage Warning Do not attempt to mea-
sure any of the high voltages --this includes the
fi lament voltage of the magnetron. High voltage
is present during any cook cycle. Before touch-
ing any components or wiring, always unplug the
oven and discharge the high voltage capacitor
(See Figure 1-1)
2. The high-voltage capacitor remains charged
about 30 seconds after disconnection. Short the
negative terminal of the high-voltage capacitor to
to the oven chassis. (Use a screwdriver.)
3. High voltage is maintained within specifi ed limits
by close-tolerance, safety-related components
and adjustments. If the high voltage exceeds the
specifi ed limits, check each of the special com-
ponents.
PRECAUTION
There exists HIGH VOLTAGE ELECTRICITY with
high current capabilities in the circuits of the HIGH
VOLTAGE TRANSFORMER secondary and fi la-
ment terminals. It is extremely dangerous to work
on or near these circuits with the oven energized.
DO NOT measure the voltage in the high voltage
circuit including fi lament voltage of magnetron.
.
Touch chassis ground fi rst then short to the high voltage
capacitor terminal by using screwdriver or jumper wire.
Fig. 1-1 Discharging High Voltage Capacitor
PRECAUTION
Never touch any circuit wiring with your hand nor
with uninsulated tool during operation.
PRECAUTION
Servicemen should remove their watches when-
ever working close to or replacing the magnetron.
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