Panasonic NN-T259WB Service Manual Download Page 1

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ORDER NO. MOP9905002C2

© 1999 Matsushita Electric Industrial Co., Ltd.
All rights reserved. Unauthorized copying and
distribution is a violation of law.

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:

20L

Outside Dimensions:

458mm (W) X 315mm (D) X 299mm (H)

Inside Dimensions:

315mm (W) X 298mm (D) X 208mm (H)

Weight:

11 Kg

Inverter Power Supply

Output power:

IEC705-88 Test procedure

Specifications subject to change without notice

Summary of Contents for NN-T259WB

Page 1: ...pecifications 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 20L Outside Dimensions...

Page 2: ...energy 3 Very high voltage may remain in the circuitry even when the oven is off High voltages may remain in the capacitors on the board DO NOT 1 Do not touch the circuitry as it becomes very hot high...

Page 3: ...transformer and or power relays RY1 13 6 5 Fan Motor 13 6 6 Temp sensor thermal protector 13 6 7 Door disassembly 14 6 8 Turntable motor 14 7 COMPONENT TEST PROCEDURE 15 7 1 Primary Latch Switch Secon...

Page 4: ...me or for standing non cooking time 7 Clock Pad Press the clock pad Using the minute and second pads set the clock 12 hr clock Press clock pad again to stop colons flashing 8 lb oz Conversion Pad 9 We...

Page 5: ...11 25 OPERATION DISPLAY 1 Place water load in oven 2 Press High once to set High Power HIGH SET TIME 3 Set time at 5 sec by pressing 1 sec pad 5 times 4 Press Medium to set Medium Power Once Once Twic...

Page 6: ...elect auto weight program CHILLED MEAL SET WEIGHT 2 Press to select grams or pounds and ounces LB OZ CHILLED MEAL SET WEIGHT 3 Enter the weight 1LB OZ PRESS START Delay Stand H 1 00 PRESS START MIN SE...

Page 7: ...7 3 SCHEMATIC DIAGRAM...

Page 8: ...colours of leadwire connector housing MAGNETRON HIGH VOLTAGE INVERTER SYMBOL COLOUR OR ORANGE BL BLUE BR BROWN W WHITE Y YELLOW R RED GR GREY BK BLACK PRIMARY LATCH SWITCH TOP SECONDARY LATCH SWITCH...

Page 9: ...ermines the power level and cooking time to complete cooking and indicates the operating state in the display The table shows the corresponding cooking times for respective weight by categories 2 When...

Page 10: ...unding bracket to the chassis ground otherwise this H V Inverter circuit board will expose very high voltage and cause extreme DANGER Be sure to have proper grounding by the grounding plate and screws...

Page 11: ...nto the wall outlet 3 Check for microwave energy leakage Refer to procedure for measuring microwave energy leakage 5 7 Sharp edges WARNING When the 10A 250V fuse is blown due to the operation of short...

Page 12: ...4 Remove 1 screw and remove the inverter PCB plus support base from the oven 5 Remove 1 screw to disconnect earth wire to magnetron 6 Remove 4 screws holding inverter power supply board to the Invert...

Page 13: ...he 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 solderin...

Page 14: ...hinge in the direction necessary for proper alignment 2 Adjust so that the door has no play between the inner door surface and oven front surface If the door assembly is not mounted properly microwav...

Page 15: ...d magnetron 1 Isolate magnetron from the circuit by disconnecting the leads 2 A continuity check across magnetron filament terminals should indicate one ohm or less 3 A continuity check between each f...

Page 16: ...the cavity reaches 257 F 125 C The device is connected to the DPC on touch control models When the thermal protector exceeds its temperature it will turn off the power to oven cavity and display will...

Page 17: ...using the simple method outlined below Necessary Equipment 1 litre beaker Glass thermometer Wrist watch or stopwatch NOTE Check the line voltage under load Low voltage will lower the magnetron output...

Page 18: ...operation at all Fuse is blown 1 Shorted lead wire harness 2 Defective primary latch switch NOTE 1 3 Defective short switch NOTE 1 4 Defective Inverter power supply U Refer to component test procedur...

Page 19: ...IONS NEW H V CLOCK DELAY STAND START HIGH POWER DISPLAY 4L1BPQ H97 H98 appears in the Check magnetron filament OK Check Inverter input AC AC 240V Check Inverter control signal Approx AC 3V refer to co...

Page 20: ...efer to component less than 0 4A Open DANGER Magnetron DPC board Power Delay Loose wiring Latch switch DO NOT try to REPAIR this Inverter Power Supply U display window pares measure at oven plug conti...

Page 21: ...n even though the program has been set and the start pad is tapped 1 IC 1 pin 11 voltage while operation Abnormal IC 1 Normal 5V Step 2 2 Short circuit between pin 6 and pin 16 of IC 2 Still not turn...

Page 22: ...22 10 EXPLODED VIEW AND PARTS LIST 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42...

Page 23: ...E 1 14 E400A4760JP FAN MOTOR 1 15 E42094L00GS LOWER ORIFICE 1 16 E4008 1640 FANBLADE 1 17 E40314L00GS AIR GUIDE C 1 18 XTWANE4 12B SCREWS 4 FOR MAGNETRON 19 2M236 M42E2 MAGNETRON 1 20 E030E4L00GS H V...

Page 24: ...D7 Ref No Part No Part Name Description Pcs Set Remarks D1 E302A4L10HBP DOOR A SCREEN B ASSEMBLY 1 NN T259WB D1 E302A4L10BP DOOR A SCREEN B ASSEMBLY 1 NN T259CB D2 E30214000AP DOOR KEY SPRING 1 D3 E3...

Page 25: ...NING BUTTON 1 NN T259CB E2 E80378AOAG DOOR BUTTON SPRING 1 E3 E80344L10HBP ESCUTCHEON BASE 1 NN T259WB E3 E80344L10BP ESCUTCHEON BASE 1 NN T259CB E4 E81274L10BP ESCUTCHEON BACK PLATE 1 E5 E603L4L10BP...

Page 26: ...Pcs Set Remarks P1 E290D4060AP ROLLER RING 1 P2 E202K4080BP ROLLER BEAD ASSEMBLY 3 Note 1 P3 E06014L00BP GLASS TRAY 1 P4 E00034L20BP INSTRUCTION BOOK 1 P5 E01695750BP SERVICE CENTER LIST 1 P6 E01084L0...

Page 27: ...t No Description Qty Remarks R1 ERG1SJ753P RESISTOR 1 75K 1W C1 C2 AECQJ5225KX1 CAPACITOR 2 2 2 f C3 C4 ECKMNA472ME CAPACITOR 2 4700pF 250V AC L1 E621A4J00XN FILTER COIL 1 2 4mH GND E03594080BP EARTH...

Page 28: ...28 15 DIGITAL PROGRAMMER CIRCUIT...

Page 29: ...29...

Page 30: ...3GSYJ683V CHIP RESISTOR 9 68K Ref No Part No Description Qty Remarks CN5 AEEM19FEBVKN 19 PIN CONNECTOR 1 CN1 AEEMMD05507W 7 PIN CONNECTOR 1 RY1 AEGG5G1A12 RELAY 2 12V RY2 RY3 AEBGG5N1A12 RELAY 2 12V D...

Page 31: ...31 NOTES...

Page 32: ...32 NOTES SM K PEN S 4L10BP Printed in the UK...

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