Panasonic NN-T259WB Service Manual
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Panasonic NN-T259WB Service Manual

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Service Manual
Specifications:
Power Source:
Power Requirements:
Output: (IEC705-88)
Microwave Frequency:
Timer:
Oven Cavity Size:
Outside Dimensions:
Inside Dimensions:
Weight:
Inverter Power Supply
Output power:
240 V AC Single Phase, 50 Hz
Microwave: 1100W
900W
2,450Mhz
99 min. 99 sec.
20L
458mm (W) X 315mm (D) X 299mm (H)
315mm (W) X 298mm (D) X 208mm (H)
11 Kg
IEC705-88 Test procedure
Specifications subject to change without notice
ORDER NO. MOP9905002C2
Microwave Oven
NN-T259WB
NN-T259CB
© 1999 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-T259WB

  • Page 1 ORDER NO. MOP9905002C2 Service Manual Microwave Oven NN-T259WB NN-T259CB Specifications: Power Source: 240 V AC Single Phase, 50 Hz Power Requirements: Microwave: 1100W Output: (IEC705-88) 900W Microwave Frequency: 2,450Mhz Timer: 99 min. 99 sec. Oven Cavity Size: Outside Dimensions: 458mm (W) X 315mm (D) X 299mm (H)
  • Page 2 WARNING This service information is designed for experienced repair technicians only and is not designed for use by the general public. It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product. Products powered by electricity should be serviced or repaired only by experienced professional technicians.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS CONTROL PANELS ..............................4 OPERATION AND DIGITAL PROGRAMMER CIRCUIT TEST PROCEDURE ............5 SCHEMATIC DIAGRAM............................7 DESCRIPTION OF OPERATING SEQUENCE ......................9 Variable power cooking control ........................9 Autoweight defrost, autoweight cook........................ 9 CAUTIONS TO BE OBSERVED WHEN TROUBLESHOOTING................10 Check the grounding ............................

  • Page 4: Control Panels

    CONTROL PANELS Display Window Time Pads Auto Weight Microwave Program Auto Weight Defrost Programs Microwave Power Settings Delay/Stand Pad: This can be used to delay a cooking program for up to 9 hrs 99 mins., or used to time or for standing (non-cooking) time.

  • Page 5: Operation And Digital Programmer Circuit Test Procedure

    OPERATION AND DIGITAL PROGRAMMER CIRCUIT TEST PROCEDURE Operation guide on the display. To assist in programming, the next operation will appear on the display. When you are used to operating the oven, you can turn the operating guide off. To turn off: To turn on: Press 3 times Press 3 times...
  • Page 6 4. DELAY STAND OPERATION DISPLAY OPERATION DISPLAY 4. Press start 1. Set power level and time 2. Press stand STAND Delay/ SET TIME 7. TO SET CHILD SAFETY LOCK Stand OPERATION DISPLAY 3. Set standing time 1. Press start 3 times to display lock PRESS START * LOCK...

  • Page 7: Schematic Diagram

    SCHEMATIC DIAGRAM...
  • Page 8 N O T E : *W hen replacing , ch eck the lea d colou r as show n . *C olou rs show n b y ( ) indicate colours of lead w ire conne ctor housing. PRIMARY LATCH SWITCH M AG NETR O N CAUTION: HEAT SINK...

  • Page 9: Description Of Operating Sequence

    DESCRIPTION OF OPERATING SEQUENCE 4.1 Variable power cooking control VARIABLE POWER COOKING POWER OUTPUT RY-1 INVERTER HIGH VOLTAGE INVERTER POWER SUPPLY (U) controls SETTING POWER CONTROL output power by a signal from Digital Programmer Circuit (DPC). APPROX. SIGNAL Power relay 1 stays on to supply power to the inverter circuit. HIGH 900W stay ON...

  • Page 10: Cautions To Be Observed When Troubleshooting

    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. H.V. INVERTER(U) CAUTION Servicemen should remove their watches whenever working BE SURE TO HAVE PROPER close to or replacing the magnetron.

  • Page 11: When The 10A Fuse Is Blown Due To The Operation Of Short Switch

    5.3 When parts must be replaced, remove 5.6 Confirm after repair the power plug from the outlet. 1. After repair or replacement of parts, make sure that the screws of the oven, etc. are neither loose nor missing. 5.4 When the 10A fuse is blown due to the Microwaves might leak if screws are not properly tightened.

  • Page 12: Disassembly And Parts Replacement Procedure

    DISASSEMBLY AND PARTS REPLACEMENT PROCEDURE 6.1 Magnetron DANGER 1. Discharge the high voltage capacitors. HIGH VOLTAGE 2. Disconnect wire terminals to the thermal cutout. AREA 3. Remove 1 screw holding the thermal cutout bracket to the magnetron. 4. Remove 1 screw holding the air guide A. AIR GUIDE 5.

  • Page 13: Digital Programmer Circuit (Dpc) And Membrane Key Board

    6.3 Digital Programmer Circuit (DPC) and 6.5 Fan Motor membrane key board. 1. Remove 2 screws and remove tie bar. 2. Disconnect 2 lead wires from fan motor terminals. NOTE: Be sure to ground any static electric charge built up on 3.

  • Page 14: Door Disassembly

    6.7 Door disassembly 6.8 Turntable motor 1. Remove door C from door E by carefully pulling outward 1. Remove the motor cover by breaking off at the 8 spots starting from upper right hand corner using a flat blade indicated by arrows. (See Figure) screwdriver.

  • Page 15: Component Test Procedure

    COMPONENT TEST PROCEDURE 7.3 Magnetron Continuity checks can only indicate an open filament or a CAUTION NEW H.V. shorted magnetron. To diagnose for an open filament or shorted 1. High voltage is present at the high voltage terminal of the magnetron.

  • Page 16: Inverter Power Supply (U)

    7.5 Inverter Power Supply (U) DO NOT try to REPAIR this H.V. Inverter power supply (U). Replace as whole H.V. Inverter(U) Unit. HIGH VOLTAGE HEAT SINK TRANSFORMER (RECTIFIER BRIDGE) CHOKE COIL FILM CAPACITORS CN 702 SAND BAR RESISTOR PRIMARY WINDINGS CUSTOM I.C.

  • Page 17: Measurements And Adjustments

    MEASUREMENTS AND ADJUSTMENTS WARNING • For continued protection against radiation hazard, replace only with identical replacement parts. • When the 10 Amp. fuse is blown due to the operation of SCREW short switch, you must replace Primary latch switch and short switch.

  • Page 18: Troubleshooting Guide

    TROUBLESHOOTING GUIDE NEW H.V. CAUTION 1. DO NOT try to REPAIR this H.V. Inverter power supply(U). Replace as whole H.V. Inverter(U) Unit. When returning H.V. Inverter(U) make sure to pack as originally packed. 2. DO NOT RE-ADJUST PRESET VOLUME on the H.V. Inverter(U). It is very dangerous to repair or adjust without sufficient test equipment because this circuit handles very large current with very high voltage.
  • Page 19 SYMPTOMS CAUSE CORRECTIONS Loud buzzing noise can be heard. 1. Loose fan and fan motor 10 Turntable motor does not rotate. 1. Open or loose wiring of turntable motor 2. Defective turntable motor 11 Oven stops operation during cooking. 1. Open or loose wiring of primary and Adjust door and latch switches.
  • Page 20 NEW H.V. Alternative way to troubleshooting oven with AC Ampare meter used. Oven shuts down after approximately 15 or 33 seconds. If the microwave oven shuts down after a short time in micropower mode, conduct the following test. The microwave oven must be set in test mode to activate the self diagnostic failure code system. SELF TEST MODE DISPLAY DELAY/...
  • Page 21 Trouble Related to Digital Programmer Circuit SYMPTOM STEP CHECK RESULT CAUSE/CORRECTIONS No display when oven is first Fuse pattern of DPC Normal STEP 2 plugged in. Open (NOTE) Shorted Circuit of ZNR, L.V.T., Oven Lamp etc. Replace DPC IC10 Pin 9 Abnormal 0V IC10 Oven is dead.

  • Page 23: Parts Lists

    INVERTER EARTH BRACKET E65854L00GS INVERTER SUPPORT BRACKET E606Y4L10GP INVERTER E10014L00GS BASE PLATE E10614L00GS WATER SHEILD E1008-1180 RUBBER FOOT E110D4L00HBP OUTER PANEL NN-T259WB E110D4L00BP OUTER PANEL NN-T259CB E63268960JP TURNTABLE MOTOR E21774L00GS PULLEY SHAFT WASHER E21315870GP PULLEY SHAFT E30074L00GS LOWER HINGE E20554L00GS...

  • Page 24: Door Assembly

    12. DOOR ASSEMBLY Ref. No. Part No. Part Name & Description Pcs/Set Remarks E302A4L10HBP DOOR A SCREEN B ASSEMBLY NN-T259WB E302A4L10BP DOOR A SCREEN B ASSEMBLY NN-T259CB E30214000AP DOOR KEY SPRING E30184L00GS DOOR KEY A E302K4L00GS DOOR E AND SCREEN A UNIT...

  • Page 25: Escutcheon Base Assembly

    13. ESCUTCHEON BASE ASSEMBLY Ref. No. Part No. Part Name & Description Pcs/Set Remarks E80724L10HBP DOOR OPENING BUTTON NN-T259WB E80724L10BP DOOR OPENING BUTTON NN-T259CB E80378AOAG DOOR BUTTON SPRING E80344L10HBP ESCUTCHEON BASE NN-T259WB E80344L10BP ESCUTCHEON BASE NN-T259CB E81274L10BP ESCUTCHEON BACK PLATE...

  • Page 26: Packing And Accessories

    E06014L00BP GLASS TRAY E00034L20BP INSTRUCTION BOOK E01695750BP SERVICE CENTER LIST E01084L00GS TRAY PACKING E01054L00BP LOWER FILLER E01024L10HBP CARTON BOX NN-T259WB E01024L10BP CARTON BOX NN-T259CB E01078990BP DOOR SHEET AEE01066Q0BP VINYL COVER E01927550GP PROTECTOR SHEET E01044L00BP UPPER FILLER Note 1 When ordering P2 Roller bead assembly, 3 rollers will be supplied. Please replace all rollers to ensure smooth rotation of the...
  • Page 27 E607X4L00BP - Noise Filter Assembly Ref. No. Part No. Description Remarks ERG1SJ753P RESISTOR 75KΩ 1W C1&C2 AECQJ5225KX1 CAPACITOR 2.2µf C3&C4 ECKMNA472ME CAPACITOR 4700pF 250V AC E621A4J00XN FILTER COIL 2.4mH E03594080BP EARTH WIRE E62316010BP FUSE HOLDER 10A 250V AC...

  • Page 28: Digital Programmer Circuit

    15. DIGITAL PROGRAMMER CIRCUIT...

  • Page 30: Digital Programmer Circuit - Parts List

    16. DIGITAL PROGRAMMER CIRCUIT - PARTS LIST DPC AU - E603L4L10BP Ref. No. Part No. Description Remarks AEEM19FESVKN 19PIN CONNECTOR DISP AEDDHLC4L2BP IC220 AN6747B CUSTOM IC D180-D182 AESQTLGE260T GREEN LED CX320 EF0MC8004T4 CERAMIC RESONATOR SW40-42 EVQ11L05R PUSH SWITCH SW44-47 SW50-63 R182 ERDS2TJ361T RESISTOR...
  • Page 31 NOTES:...
  • Page 32 NOTES: S - 4L10BP Printed in the UK...

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Nn-t259cb

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