- 2 -
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
indicated in the circuit diagram by shading,
or .
19. Use replacement components that have the same
ratings, especially for flame resistance and
dielectric strength specifications. A replacement part
that does not have the same safety
characteristics as the original might create shock,
fire or other hazards.
1. High Voltage Warning Do not attempt to measure-
any of the high voltages--this includes the filament
voltage of the magnetron. High voltage is present
during any cook cycle. Before touching any com-
ponents 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 nega-
tive terminal of the high-voltage capacitor to to the
oven chassis. (Use a screwdriver.)
3. High voltage is maintained within specified limits by
close-tolerance, safety-related components and ad-
justments. If the high voltage exceeds the specified
limits, check each of the special components.
H. V. Diode
Short
H. V. Capacitor
Fig. 1-1 Discharging High Voltage Capacitor
Touch chassis ground first then short to the high
voltage capacitor terminal by using screwdriver or
jumper wire.
PRECAUTION
There exists HIGH VOLTAGE ELECTRICITY with
high current capabilities in the circuits of the HIGH
VOLTAGE TRANSFORMER secondary and fila-
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 filament voltage of magnetron.
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.
1-3 Special High Voltage Precautions
