Panasonic Sonic Steamer NE-3280 User manual

©2001 Matsushita Electric Industrial Co., Ltd. All
rights reserved. Unauthorized copying and
distribution is a violation of law.
NE-3280
NE-3240
NE-2180
NE-2140
Microwave Oven
ORDER NO. MOD0108245C2

1 OUTLINE DIAGRAM 3
2 OPERATION PROCEDURE (NE-3280/2180) 5
3 OPERATION PROCEDURE (NE-3240/2140) 8
4 SCHEMATIC DIAGRAM NE-3280 9
5 SCHEMATIC DIAGRAM NE-3240 10
6 SCHEMATIC DIAGRAM NE-2180 11
7 SCHEMATIC DIAGRAM NE-2140 12
8 WIRING DIAGRAM NE-3280 13
9 WIRING DIAGRAM NE-3240 14
10 WIRING DIAGRAM NE-2180 15
11 WIRING DIAGRAM NE-2140 16
12 DESCRIPTION OF OPERATING SEQUENCE 16
13 CAUTIONS TO BE OBSERVED WHEN TROUBLESHOOTING
18
14 DISASSEMBLY AND PARTS REPLACEMENT PROCEDURE 19
15 COMPONENT TEST PROCEDURE 22
16 MEASUREMENTS AND ADJUSTMENTS 24
17 TROUBLESHOOTING GUIDE 25
18 EXPLODED VIEW AND PARTS LIST 28
19 PARTS LIST 29
20 DOOR ASSEMBLE 35
21 ESCUTCHEON BASE ASSEMBLE 36
22 PACKING AND ACCESSORIES 38
23 WIRING MATERIAL 39
24 DIGITAL PROGRAMMER CIRCUIT 43
25 DIGITAL PROGRAMMER CIRCUIT 44
CONTENTS
Page Page
2
NE-3280 / NE-3240 / NE-2180 / NE-2140

1 OUTLINE DIAGRAM
3
NE-3280 / NE-3240 / NE-2180 / NE-2140

4
NE-3280 / NE-3240 / NE-2180 / NE-2140

2 OPERATION PROCEDURE (NE-3280/2180)
5
NE-3280 / NE-3240 / NE-2180 / NE-2140

6
NE-3280 / NE-3240 / NE-2180 / NE-2140

7
NE-3280 / NE-3240 / NE-2180 / NE-2140

3 OPERATION PROCEDURE (NE-3240/2140)
8
NE-3280 / NE-3240 / NE-2180 / NE-2140

4 SCHEMATIC DIAGRAM NE-3280
9
NE-3280 / NE-3240 / NE-2180 / NE-2140

5 SCHEMATIC DIAGRAM NE-3240
10
NE-3280 / NE-3240 / NE-2180 / NE-2140

6 SCHEMATIC DIAGRAM NE-2180
11
NE-3280 / NE-3240 / NE-2180 / NE-2140

7 SCHEMATIC DIAGRAM NE-2140
12
NE-3280 / NE-3240 / NE-2180 / NE-2140

8 WIRING DIAGRAM NE-3280
13
NE-3280 / NE-3240 / NE-2180 / NE-2140

9 WIRING DIAGRAM NE-3240
14
NE-3280 / NE-3240 / NE-2180 / NE-2140

10 WIRING DIAGRAM NE-2180
15
NE-3280 / NE-3240 / NE-2180 / NE-2140

11 WIRING DIAGRAM NE-2140
12 DESCRIPTION OF OPERATING SEQUENCE
16
NE-3280 / NE-3240 / NE-2180 / NE-2140

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
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.
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.
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.
17
NE-3280 / NE-3240 / NE-2180 / NE-2140

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.
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 CAUTIONS TO BE OBSERVED WHEN
TROUBLESHOOTING
18
NE-3280 / NE-3240 / NE-2180 / NE-2140

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.
Never insert a wire, nail or any other metal object through the
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.
4. Remove the 4 screws holding magnetron.
5. Remove 2 screws holding thermal cutout.
6. Remove the air guide from magnetron and install it on the
new magnetron.
NOTE
To prevent microwave leakage, tighten mounting
screws properly making sure there is no gap between
the waveguide and the magnetron.
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.
CAUTION
When connecting 2 filament lead wires to the magnetron terminals, be
sure to connect the lead wires in the correct position. The lead wire
with blue connector should be connected to “FA terminal” and white
one should be connected to “F terminal”. (See Figure)
14 DISASSEMBLY AND PARTS REPLACEMENT
PROCEDURE
19
NE-3280 / NE-3240 / NE-2180 / NE-2140

14.2. Digital programmer circuit
board
1. Remove grounding screw for membrane switch and D.P.C.
ground.
2. Remove 2 screws holding control panel assembly to detach
it from main unit then remove connectors.
3. Remove 2 screws holding the D.P.C. board and remove the
board by freeing catch hooks.
NOTE
Please use care in handling the power supply P.C.B.
and D.P.C. board to avoid damage.
14.3. Low voltage transformer
and/or power relays
NOTE
Be sure to ground any static electric charge built up on
your body before handling the DPC.
1. Using solder wick or a desoldering tool and 30W soldering
iron, carefully remove all solder from the terminal pins of the
low voltage transformer and/or power relays.
NOTE
Do not use a soldering iron or desoldering tool of
more than 30 watts on DPC contacts.
2. With all the terminal pins cleaned and separated from DPC
contacts, remove the defective transformer/power relays
and install new transformer/power relays making sure all
terminal pins are inserted completely. Resolder all terminal
contacts carefully.
14.4. Disassembly of door assembly
1. Detach the door spring ends from right and left door arms.
2. Remove the arm lever right and left by removing 2 screws
each on both sides.
3. Remove the sashes right and left by removing 1 screw each
on both sides.
4. By holding the door assembly, remove the right and left
sides door hinge pins. The door assembly is now free from
the oven.
5. Remove 3 screws holding the door A.
6. Remove the door C by using a flat screwdriver as figure.
7. Remove 4 screws holding door handle.
8. Separate door A and door E.
9. Remove the door arms by removing 1 pin each on both
sides.
20
NE-3280 / NE-3240 / NE-2180 / NE-2140