Special Servicing Precautions (Continued); Special High Voltage Precautions - Samsung GE87W Service Manual

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 flame resistance and
dielectric strength specifications. A replacement
part that does not have the same safety charac-
teristics as the original might create shock, fire or
other hazards.

1-3 Special High Voltage Precautions

1. High Voltage Warning
Do not attempt to measure any of the high volt-
ages --this includes the filament 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 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 adjustments. If the high voltage exceeds the
specified limits, check each of the special compo-
nents.
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.
NOTE : Connect the oven to a 20A. When connect-
ing the oven to a 15A, make sure that circuit
breaker can operate.
H. V. Capacitor
Short
Touch chassis ground first 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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H. V. Diode