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Panasonic NN-E251W Service Manual

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Table of Contents

Service Manual
Specifications:
Power Source
Power Requirement
Microwave Energy
Microwave Frequency
Timer
Cavity
Outside Dimensions
Inside Dimensions
Weight
230V AC Single Phase, 50Hz
Microwave: 1200W
800W (IEC-705)
2,450MHz
59min. 90sec.
19L
465mm(W) X 346mm(D) X 279mm(H)
290mm(W) X 306mm(D) X 220mm(H)
12.5 kg
Specifications subject to change without notice
Order number: MOP0105003C2

Microwave Oven

NN-E251W
© 2001 Matsushita Electric Industrial Co., Ltd.
All rights reserved. Unauthorized copying and
distribution is a violation of law.

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Summary of Contents for Panasonic NN-E251W

  • Page 1: Microwave Oven

    Order number: MOP0105003C2 Service Manual Microwave Oven NN-E251W Specifications: Power Source 230V AC Single Phase, 50Hz Power Requirement Microwave: 1200W Microwave Energy 800W (IEC-705) Microwave Frequency 2,450MHz Timer 59min. 90sec. Cavity Outside Dimensions 465mm(W) X 346mm(D) X 279mm(H) Inside Dimensions...

  • Page 2: Table Of Contents

    11. DOOR ASSEMBLY ..............................18 12. ESCUTCHEON BASE ASSEMBLY .......................... 19 13. PACKING AND ACCESSORIES ..........................20 14. DIGITAL PROGRAMMER CIRCUIT .......................... 21 15. SCHEMATIC DIAGRAM ............................. 22 FEATURE CHART FEATURES NN-E251W Microwave Auto Weight Cook Auto Weight Defrost Stage Cooking 3 stage More/Less kg/lb.oz...

  • Page 3: Control Panel

    1. CONTROL PANEL (10) (1) Display Window (9) Stop/Cancel Pad: BEEP SOUND (2) Time Pads Before cooking: One press clears When a pad is touched correctly (3) Microwave Power Levels your instructions. a beep will be heard. If a pad is (4) Auto Weight Programs During cooking: touched and no beep is heard,...

  • Page 4: Operating Procedure

    2.OPERATING PROCEDURE 2.1 Setting the Clock When the oven is fist plugged in “88:88” appears in the display window Example: to set 11:25pm. Press 11times -- -- Press twice Press 5 times -- Press Clock pad. Press Time pads. Press Clock pad. Display will show "12H"...

  • Page 5: Description Of Operating Sequence

    4. DESCRIPTION OF OPERATING SEQUENCE 4.1 Variable power cooking control POWER OUTPUT ON TIME OF OFF TIME OF SETTING POWER POWER RELAY B POWER RELAY B The coil of power relay B(RY 1) is energized intermittently APPROX. ON(SEC) OFF(SEC) by the digital programmer circuit, when the oven is set at any power selection except for high power position.

  • Page 6: Cautions To Be Observed When Troubleshooting

    5. CAUTIONS TO BE OBSERVED WHEN TROUBLESHOOTING Unlike many other appliances, the microwave oven is high- IMPORTANT NOTE voltage, high-current equipment. Though it is free from dan- High voltage above 250 volts exists on the following parts ger in ordinary use, extreme care should be taken during during operation.

  • Page 7: Parts Replacement Procedure

    6. PARTS REPLACEMENT PROCEDURE 6.1 Magnetron 1. Discharge the high voltage capacitor. MAGNETRON 2. Disconnect 2 high voltage lead wires from the magnetron filament terminals. 3. Remove 1 screw holding the magnetron. NOTE: After replacement of the magnetron, tighten mounting screws properly making sure trhere is no gap between the waveguide and the mag- netron to prevent microwave leakage.
  • Page 8 6.5 Fan motor NOISE FILTER 1. Disconnect 2 lead wires from fan motor terminals. EARTH SCREW 2. Remove a screw holding earth of noise filter. 3. Remove a screw which secure the wind guide assembly. 4. Draw forward the wind guide assembly. 5.

  • Page 9: Component Test Procedure

    7. COMPONENT TEST PROCEDURE CAUTION 1. High voltage is present at the high voltage terninal of the high voltage transformer during any cook cycle. 2. It is neither necessary nor advisable to attempt mea- surement of the high voltage. 3. Before touching any oven components, or wiring, always unplug the oven from its power source and dis- charge the high voltage capacitor.
  • Page 10 7.6 Oven thermostat A oven thermostat is mounted on bottom of the oven cavity at the center. Its purpose is to automatically shut off the oven is case the cavity overheats for any reason. The thermal protector will operate at 167˚F(75˚C). When the thermal protector exceeds its temperature it will turn off the power to oven cavity and display will go to reset mode.

  • Page 11: Measurements And Adjustments

    8. MEASUREMENTS AND ADJUSTMENTS 8.1 Installation of primary latch switch, sec- ondary latch switch and short switch 1. When mounting primary latch switch, secondary latch switch and short switch to door hook assembly, mount the primary latch switch, the secondary latch switch and the short switch to the door hook assembly as shown in the illustration.

  • Page 12: Troubleshooting Guide

    9. TROUBLESHOOTING GUIDE CAUTION 1. Check the unit is grounded before commencing any troubleshooting. 2. Do not take measurements in the high voltage circuit. 3. Discharge the high voltage capacitor. 4. When checking then continuity of the switches or the high voltage transformer, disconnect one lead wire from these parts and then check continuity with the AC plug removed.
  • Page 13 9.2 (TROUBLE 2) Fuse is blown SYMPTOMS CAUSE CORRECTIONS Fuse is blown. 1. Shorted lead wire harness. 2. Defective short switch. (NOTE 1) 3. Defective primary latch switch (NOTE 1) 4. Shorted H.V. capacitor 5. Shorted H.V. diode. Replace H.v. diode and HV Fuse (NOTE 2) 6.

  • Page 14: Digital Programmer Circuit

    9.4 (TROUBLE 4) Trouble related to digital programmer circuit SYMPTIOM STEP CHECK RESULT CAUSE/CORRECTIONS No display when oven is first Low voltage transfrmer (LVT) Abnormal 0V plugged in secondary voltage Normal Step 2 IC-1 pin 42 voltage Abnormal VL 1 Normal=5V Step 3 IC-1 pin 10 voltage...

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