Panasonic Sonic Steamer NE-3280 User manual

Mod: NE3240
Production code: NE3240
09/2012

ORDER NO. MOD0108245C2
Microwave Oven
NE-3280 / NE-3240 / NE-2180 / NE-2140
SPECIFICATIONS
2001 Matsushita Electric Industrial Co., Ltd. All rights reserved.
Unauthorized copying and distribution is a violation of law.
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1. OUTLINE DIAGRAM
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2. OPERATION PROCEDURE (NE-3280/2180)
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3. OPERATION PROCEDURE (NE-3240/2140)
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4. SCHEMATIC DIAGRAM NE-3280
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5. SCHEMATIC DIAGRAM NE-3240
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6. SCHEMATIC DIAGRAM NE-2180
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7. SCHEMATIC DIAGRAM NE-2140
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8. WIRING DIAGRAM NE-3280
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9. WIRING DIAGRAM NE-3240
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10. WIRING DIAGRAM NE-2180
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11. WIRING DIAGRAM NE-2140
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12. DESCRIPTION OF OPERATING SEQUENCE
Variable power cooking control
The coil of power relays are energized intermittently by the digital programmer circuit, when the oven is
set at any power selection except for High power position. The digital programmer circuit controls the
ON-OFF time of the power relays contacts in order to vary the output power of the microwave oven. The
relation between indications on the control panel and the output power of the microwave oven is as
shown in table.
NOTE
ON-OFF time of power relays are changed by digital programmer circuit when remaining cooking time
or selected cooking time are within 8 minutes at MED,@LOW and Defrost cooking mode.
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12.1. Defrost control
When defrost power and defrosting time is selected and Start pad is touched:
1. The digital programmer circuit (DPC) divides the total defrosting time
into 8 equal periods, consisting of four defrosting periods, each
followed by a standing period.(See figure)
2. During defrosting power periods, power relay ON-OFF time is
controlled at Low power mode by DPC.
3. During Standing periods, power relay is always open resulting in no
microwave power.
NOTE
Defrost time selected is converted into seconds by the DPC but display will show selected time in
minutes and seconds as programmed. The total number of seconds is divided into 8 time periods. The
remainder (seconds not equally divisible by 8) are added to the last standing time period.
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13. CAUTIONS TO BE OBSERVED WHEN
TROUBLESHOOTING
Unlike many other appliances, the microwave oven is high voltage, high current equipment. Though it is
free from danger in ordinary use, extreme care should be taken during repair.
CAUTION
Servicemen should remove their watches whenever
working close to or replacing the magnetron.
13.1. Check the earthing
Do not operate on a 2 wire extension cord. The microwave oven is designed to be used in a completely
earthed condition. It is imperative, therefore, to make sure it is properly earthed before beginning repair
work.
13.2. If the door lock, the door switch, the door seal or the door develops
a malfunction, be sure not to operate the oven until complete repairs are
made.
If the oven is operated with any of these parts in imperfect condition, hazardous microwave leakage
might occur.
WARNING
Never operate the oven until the following are
confirmed:
1. The door is tightly closed.
2. There is no broken hinge or door arm.
3. The door seal is not damaged.
4. The door is not bent or warped.
5. There is no other visible damage.
13.3. Warning about the electric charge in the high voltage capacitor.
For about 30 seconds after the oven is turned off, an electric charge remains in the high voltage
capacitor. When replacing or checking parts, remove the power plug from the outlet, wait 30 seconds
and short the terminal of the high voltage capacitor (terminal of lead wire from diode) to chassis ground
with an insulated jumper lead wire or an insulated handle screwdriver to discharge.
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Important Note
1. High voltage above 250 volts are existing on following parts during
operation.
-Magnetron
-High Voltage Transformer
-High Voltage Diode
-High Voltage Capacitor
Unusual attention should be paid during repair or
troubleshooting of product.
2. If the microwave oven is operated with incorrect installed door hinge
or magnetron, it can cause microwave leakage of over 5mW/square
centime-ter. Hence it is absolutely necessary to check if magnetron and
door hinge are correctly and safely installed after repairs or replacement.
WARNING
Never touch any circuit wiring with your hand nor
with an insulated tool during operation.
13.4. When parts must be replaced, always remove the power plug from
the outlet, and discharge the high voltage capacitor.
13.5. Confirm after repair
1. After repair or replacement of parts, make sure that the screws of the
oven, etc. are neither loose nor missing. Microwave might leak if
screws are not properly tightened.
2. Make sure that all electrical connections are tight before inserting the
plug into the wall outlet.
13.6. Avoid inserting nails, wire, etc. through holes in unit during
operation.
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Never insert a wire, nail or any other metal object through the lamp holes on the cavity or any other
holes or gaps, because such objects may work as an antenna and cause microwave leakage.
13.7.
CAUTION MICROWAVE RADIATION
Personnel should not be exposed to the microwave
energy which may radiate from the magnetron or
other microwave generating device if it is
improperly used or connected all input and output
microwave connections waveguides, flanges, and
gasket must be secure. Never operate the device
without a microwave energy absorbing load
attached. Never look into an open waveguide or
antenna while the device is energized.
13.8.
CAUTION
High voltage parts may become uncovered when
outer cabinet is removed.
14. DISASSEMBLY AND PARTS REPLACEMENT
PROCEDURE
CAUTION
Serviceman should remove their watches whenever
working close to or replacing the magnetron.
14.1. Magnetrons (Upper and Lower)
Upper magnetrons (Right and Left)
1. Discharge electric charge remaining on the high voltage capacitors.
2. Remove the entire rear panel by removing screws as shown in figure.
3. Disconnect all lead wires from magnetron and thermal cutout.
4. Remove the 4 screws holding magnetron.
5. Remove 2 screws holding thermal cutout.
6. Remove the mounting bracket from magnetron and install it on the new
magnetron.
Lower magnetrons (Right and Left)
1. Discharge electric charge remaining on the high voltage capacitors.
2. Remove the entire rear panel by removing screws as shown in figure.
3. Disconnect all lead wires from magnetron and thermal cutout.
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