- 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 fl ame resistance and
dielectric strength specifi cations. A replacement
part that does not have the same safety
characteristics as the original might create
shock, fi re or other hazards.
1. High Voltage Warning
Do not attempt to measureany of the high
voltages--this includes the fi lament voltage of the
magnetron. High voltage is present during any
cook cycle. Before touching 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
components.
H. V. Diode
Short
H. V. Capacitor
Fig. 1-1 Discharging High Voltage Capacitor
Touch chassis ground fi rst 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 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.
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
