Panasonic Nnc2000p
Panasonic Nnc2000p
Panasonic Nnc2000p
Microwave Oven
NN-C2000P
NN-C2000W
CONTENTS
Page Page
1 FEATURE CHART 4 3 OPERATION AND DIGITAL PROGRAMMER CIRCUIT TEST
2 CONTROL PANEL 5 PROCEDURE 6
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4 SCHEMATIC DIAGRAM (FOR QPQ, JPG) 7 13 EXPLODED VIEW AND PARTS LIST 30
5 SCHEMATIC DIAGRAM (FOR MNQ, YNQ, TNE, LNK, SNM, 14 PARTS LIST 31
KNQ, KKE) 8 15 DOOR ASSEMBLY 33
6 DESCRIPTION OF OPERATING SEQUENCE 9 16 ESCUTCHEON BASE ASSEMBLY 34
7 CAUTIONS TO BE OBSERVED WHEN TROUBLESHOOTING 12 17 PACKING AND ACCESORIES 35
8 DISASSEMBLY AND PARTS REPLACEMENT PROCEDURE 14 18 WIRING MATERIAL 36
9 COMPONENT TEST PROCEDURE 18 19 REF. NO. 47 H. V. INVERTER (U) 37
10 MEASUREMENTS AND ADJUSTMENTS 21 20 REF NO. E2 P. C. BOARD D (U) 37
11 TROUBLESHOOTING GUIDE (NEW H.V.) 22 21 REF NO. E3 P. C. BOARD F (U) 38
12 HOW TO CHECK THE SEMICONDUCTORS USING AN OHM 22 DIGITAL PROGRAMMER CIRCUIT 40
METER 29 23 INVERTER CIRCUIT 42
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1 FEATURE CHART
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2 CONTROL PANEL
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6.4. Combination cooking control convection, the temperatures by each program are
preprogrammed in the microprocessor as shown in Figure.
Combination cooking is accomplished by microwave and
convection cooking being done alternately during one
combination cooking cycle. One combination cooking cycle is
22 seconds.
1. During combination cooking, the digital programmer circuit
controls ON-OFF time of both power relay 1 and 7 as
shown in Figure.
2. When the power relay 1 (RY1) is turned on, heater turns off
and after the power relay 1 turns off, power relay 7 turns on.
NOTE 1: Note that the heater may not be on during a heater
on period if the preprogrammed oven temperature has
been reached. This is due to the fact that the oven is
keeping the preprogrammed oven temperature constant,
so of course the heater will only be on when it is needed
and off when it is not needed.
NOTE 2: As for temperatures of combination cooking for
As food cooks, a certain amount of steam is produced. If the 2) During the 30 second period there is no microwave activity.
food is covered, this steam builds up and eventually escapes When calculating the T2 time by using the formula below, make
from the container. In Auto Sensor Cooking, carefully designed sure this 30 seconds is subtracted from the T0 time.
instrument, called the humidity sensor element, senses this 3) T1 time To time - 30 seconds
escape of steam. Then, based upon the Auto Sensor Program 4) T2 time When the steam escapes from the cooking
selected, the unit will automatically determine the correct power container placed in the oven, the humidity sensor detects it and
level and the proper length of time it will take to cook the food. the microprocessor calculates the balance of cooking time.
NOTE: Auto Sensor Cooking is successful with the foods This T2 time is then shown in the display and begins counting
and recipes found in the Auto Sensor Cooking Guide. down.
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lamp holes on the cavity or any other holes gaps, because such
objects may work as an antenna and cause microwave
leakage.
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8.5. Heater
1. Remove lead wires from lead wire holders.
2. Remove belt from pulleys of circulation fan.
3. Remove 2 screws holding heater fan motor bracket.
4. Remove 1 screw holding exhaust guide.
5. Remove 2 screws holding oven temp sensor.
6. Disconnect 2 lead wires from heater terminals.
7. Remove 4 screws holding the both sides of heater unit and
lift it up carefully.
8. Remove 3 screws holding heater supports and detach the
heater.
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9.5. Inverter Power Supply (U) DO NOT try to REPAIR this H. V. Inverter power supply (U).
Replace as whole H. V. Inverter (U) Unit.
(NEW H.V.)
Refer to warning on page 2.
9.6. Inverter Power Supply (U) 9.7. Steam Sensor and Digital
(NEW H,V,) Programmer Circuit
DANGER HIGH VOLTAGE In order to determine if the steam sensor function of the digital
Test 1 programmer circuit is in working order or not, do the following
test.
1. Place 1 liter of water load into oven cavity.
1. Place a water load (150 cc) in the oven.
2. Unplug 2 pin H. V. lead wire connector CN703 from
magnetron tube. 2. Tap Sensor Reheat pad.
3. Program oven at High power for 1 minute and press start. 3. Tap Start Pad.
a. After approx. 23 seconds, oven stops. 4. Steam Sensor detects steam about 1.5 to 4 minutes after
the Start Pad is tapped.
b. During oven operation, input current is approx. at 0.5 to
1.0A . If input current is OK, please proceed to test 2. 5. T1 time cooking automatically switches to remaining time
cooking (T2).
6. The remaining cooking time (T2) appears in display
window. If the following cooking time appears, Steam
Sensor function is normal.
Test 2
Continued from Test 1
1. Unplug 3 pin connector, CN701 CN703 remaisn unplug.
2. Set oven at High power for 1 minute and start.
9.8. Oven temp sensor thermistor
a. After approx. 3 seconds, oven.
This sensor monitors the heat produced by the heater circuit
b. During oven operation, input current should be less than
and maintains the oven temperature the user had selected.
0.4A.
Normal room 10°C to 30°C. The reading across the oven
sensor thermistor should be within 100K ohm to 300K ohm
when reading in an area with the 50°F to 90°F room
temperature range.
If the resistance reading is out of the range stated here, the
sensor is detective and must be replaced.
If both 1 and 2 are OK, the Inverter Power Supply (U) can be
determined OK. NOTE 1: When measuring resistance disconnect the 3-pin
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connector (CN6) from the DPC otherwise a false reading the microwave oven has been operating, the sensor of
may be indicated. course won't be room temperature. In this case the sensor
NOTE 2: If checking an oven sensor thermistor just after must be removed and allowed to cool down to the 50°F to
the microwave oven has been operating, the sensor of 90°F range.
course won't be room temperature. In this case the sensor
must be removed and allowed to cool down to the 10°C to
30°C range.
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1. Discharge high voltage before touching Inverter PCB. 2. Remove inverter PCB from oven before troubleshooting.
1. Unplug oven and leave it for more than 30 seconds before Refer to related service manual for inverter PCB removal.
removing outer cabinet. 1. Visual check:
2. Use insulated lead wire to short across D701 Anode to a. PCB board: Any crack on board, burnt printed copper
D702 Cathode or short across magnetron filament foil pattern? Any cockroach, bugs excrements, any mark
terminals to the chassis ground. Please refer to service of wet?
manual for detail of the specified model.
b. Components: Any damaged components? Any burnt,
broken or missing?
3. Check component by circuit tester.
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7. Apply extra solder onto Q701 and Q702 legs and printed
foil pattern to be able to hold main large current of more
than 15A.
Service hint:
For easy removal of solder, apply some solder first than suck it
all.
8. How to test repaired Inverter PCB.
WARNING:
1. Do not test Inverter PCB with using any extention cable
Open gounding of inverter PCB is so DANGER.
2. Make sure to check no Bridge solder nor cold solder joint.
1. Install Inverter PCB into oven with screws securely, plug in
5. Screw must be tighten securely.
CN701, CN702 and CN703.
6. Install the heatsink onto the PCB by a screw and make
2. Insert AC plug through the Amper meter with specified
sure to apply extra solder between legs and PCB pattern
voltage.
so that it's able to flow 15A or more main current.
NOTE: Current will be changed by the input AC voltage.
3. Operate the oven at High power setting for 1 minute.
4. Read input current which should be within oven
specification.
NOTE: Input current will be decreased after a certain
cooking period.
5. Adjustment is not necessary when replacing transistors
You may adjust the preset volume control VR701 to meet
the specified input current when Transformer is replaced.
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14 PARTS LIST
When ordering replacement part(s) please use part number(s) shown in this parts list.
Do not use description of the part.
Important safety notice:
Components identified by mark have special characteristics important for safety.
When replacing any of these components, use only manufacturer's specified parts.
Alphabet marks in Remarks colums (l. e. HNE etc.) indicate parts applicable to only specified country models as follows.
HNE: For Hong Kong, JPG: For New Zealand, KKE: For U.A.E., Egypt, Iran,
KNQ: For Kuwait, Doha, Qatar, Oman, Baharain, Pakistan, LNK: For Philippines,
MNQ: For Malaysia, QPQ: For Australia, SNM: For Saudi Arabia,
TNE: For Thailand, Indonesia, YNQ: For Singapore
Parts without these marks can be used for all models.
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15 DOOR ASSEMBLY
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18 WIRING MATERIAL
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23 INVERTER CIRCUIT
SCHEMATIC DIAGRAM
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