R -3A53
R-3A53B
ASYMMETRIC RECTIFIER
The asymmetric rectifier is a solid state device that
prevents current flow in both directions. And it pre-
vents the temperature rise of the power transformer by
blowing the fuse M6.3A when the high voltage rectifier
is shorted.
.+galG” VOLTAGE RECTIFIER
The rated peak reverse voltage of Dl of the asymmetric
rectifier is 6 KV The rated peak reverse voltage of D2
of the asymmetric rectifier is 1.7 KV. Dl and D2 of the
asymmetric rectifier or high voltage rectifier are shorted
when the each peak reverse voltage goes beyond the
each rated peak reverse voltage. (The process of
blowing the fuse M6.3A.)
1. The high voltage rectifier is shorted by any causes
when microwave cooking.
2. The peak reverse voltage of D2 of the rectifier goes
beyond the rated peak reverse voltage 1.7 KV in the
voltage doubler circuit.
3. D2 of the rectifier is shorted.
4. The large electric currents flow through the high
voltage winding of the power transformer.
5. The large electric currents beyond 6.3A flow
through the primary widing of the power transfor-
mer.
6. The fuse M6.3A blows by the large electric currents.
7. The power supply to the all electrical parts is cut
off.
FUSE F M6.3A
1. The fuse M6.3A blows when the contacts (COM
- NO) of the 1 st latch switch and 2nd latch switch
remain closed with the oven door open and when
the monitor switch closes.
2. The fuse M6.3A also blows when asymmetric
rectifier, H.V. rectifier, H.V. wire harness, H.V.
capacitor, magnetron or secondary winding of
power transformer is shorted.
3. If the wire harness or electrical components are
short-circuited, the fuse M6.3A blows to prevent
an electric shock of fire hazard.
NOISE FILTER
(FOR NEW ZEALAND)
The noise filter assembly prevents radio frequency in-
terference that might flow back in the power circuit.
TEMPERATURE FUSE TFI 150°C (MG)
This fuse protects the magnetron against overheating.
If the temperature goes up higher than 150°C because
the fan motor is interrupted, the air inlet duct is blocked
or the ventilation openings are obstructed, the fuse
blows and cuts off the power supplying to the power
transformer. The defective fuse must be replaced with
new rated one.
TEMPERATURE FUSE TF2 115°C
If the temperature of the temp. fuse goes up higher
than 115°C because the ventilation openings are ob-
structed, the fuse blows and cut off the power sup-
plying to the power transformer. The defective fuse
must be replaced with new rated one.
TEMPERATURE FUSE TF3 150°C (OVEN)
The temperature fuse located on the top of the oven
cavity is designed to prevent damage to the oven if the
foods in the oven catch fire due to over heating
produced by unproper setting of cook time or failure
of timer motor.
Under normal operation, the temperature fuse remains
closed. However, when abnormally high temperatures
are reached within the oven cavity, the temperature
fuse will open at 1 50°C, causing the oven to shut
down.
TURNTABLE MOTOR TTM
The turntable motor drives the roller stay to rotate the
turntable.
FAN MOTOR FM
The fan motor drives a blade which draws external cool
air. This cool air is directed through the air vanes sur-
rounding the magnetron and cools the magnetron.
This air is channeled through the oven cavity to remove
steam and vapors given off from the heating foods. It
is then exhausted through the exhausting air vents at
the oven cavity
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