Panasonic NN-T573SBBPQ 27 Service Manual
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Panasonic NN-T573SBBPQ 27 Service Manual

Panasonic NN-T573SBBPQ 27 Service Manual

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MOP0306003A2
Microwave Oven
NN-T573SBBPQ
27
United Kingdom
Please file and use this manual together with the service manual for
Model No. NNT591WBBPQ, Order No. MOP010060022C2.
SPECIFICATIONS

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Summary of Contents for Panasonic NN-T573SBBPQ 27

  • Page 1 MOP0306003A2 Microwave Oven NN-T573SBBPQ United Kingdom Please file and use this manual together with the service manual for Model No. NNT591WBBPQ, Order No. MOP010060022C2. SPECIFICATIONS...

  • Page 2: Description Of Operation

    1995 Matsushita Electric Industrial Co., Ltd. All rights reserved. Unauthorized copying and distribution is a violation of law. 1. Description of operation 1.1. Auto weight defrost, Auto weight Cook When an auto control feature is selected and the start pad pressed: 1.
  • Page 3 Category 1st Touch Cooking Weight Time 1.Curry 300g 3m 30s 2.Chinese Style 200g 2m 10s 3.Pasta 250g 2m 55s 4.Casserole 300g 3m 15s 5.Fresh Fish 100g 1m 30s 6.Fresh Vegetables 100g 2m 20s 7.Chilled Crispy Top 300g 8.Frozen Crispy Top 300g 9.Jacket Potatoes 200g...
  • Page 4 Important safety notice 1. Components identified by mark have special characteristics important for safety. When replacing any of these components, use only the manufacturers specified parts. Ref. No. Part No. Part Name & Description E900C6430BP Power Supply Cord E607X4L00BP Noise Filter E67597550GP Ceramic Fuse 10A E030A6C90BP...
  • Page 5 Ref. No. Part No. Part Name & Description E09250000BD Cushion Rubber E09230000AD Cushion Rubber 4. Door exploded view and parts list Ref. No. Part No. Part Name & Description E302A6C90SBP Door A Assembly E30214000AP Door Key Spring E30184L00GS Door Key E302K4V00BP Door E E30854V00BP...
  • Page 6 Ref. No. Part No. Part Name & Description E890L6C90SBP Escutcheon base assembly E80726B20SBP Door opening button E80375K00AP Door opening button spring E82566B20ABP Door opening lever E80056B20ABP PCB spacer E81896B20ABP Display window E80876B20ABP Earth spring E00076C90SBP Name plate E80246C90SBP Operation Button NOTE 1: If the part you need is not numbered in the exploded view, order E1 the complete assembly.
  • Page 7 Ref. No. Part No. Part Name & Description E01084V00BP Tray packing E06014N30BP Glass tray E290D4N00BP Roller ring E01695750BP Service center list E00036C90BP Operating instructions and cook book E01134N30BP Tray styrol E01025N20BP Carton box E01054V00BP Lower filler E01076700BP Door sheet E01069010GS Vinyl Cover E01926430GP Protector sheet...
  • Page 8 Trim model number Top and bootom strip REF 1 Qty Top and bootom strip REF 2 Remarks NN-TKV673MBBP E1603A510NBP E1601A510NBP E000QA880BP Installation guide 8. Digital Programmer Circuit...

  • Page 11: Microwave Oven

    MOP01060022C2 Microwave Oven NN-T591WB NN-T571SB NN-T551WB NN-T551CB United Kingdom www.electronicsrepair.net...

  • Page 12: Inverter Warning

    1. Inverter Warning The inverter board looks like a normal printed circuit board. However, this printed circuit board supplies the magnetron tube with very high voltage and current. The inverter PCB: 1. Produces very high voltage and current. 2. Has an Aluminium heat sink which becomes very hot. 3.
  • Page 13 2. Do not touch the aluminium heat sink as it is part of the high voltage circuit and becomes very hot. 3. Do not attempt to repair the inverter PCB as this can be very dangerous. Replace the high voltage, inverter circuit as a complete unit. 4.

  • Page 14: Feature Chart

    Inverter Layout 2. FEATURE CHART Function NN-T551WB NN-T591WBNN- NN-T551CB T571SB Microwave Sensor reheat Sensor Cook Turbo reheat Weight reheat Weight cook Weight combination Weight defrost Delay/Stand More / Less Kg - lb/oz Stage cooking Clock Word prompt English English 3. Control Panels...

  • Page 15: Setting The Clock

    4. Operation And Digital Programmer Test Procedure 4.1. Setting The Clock 1. Plug the power supply cord into the wall outlet 2. Press the clock pad 3. Enter the time of the day...

  • Page 16: Microwave Cooking

    4. Press the clock pad 4.2. Microwave Cooking 1. Place a water load in the oven 2. Press Micro power once to set high power 3. Set time at 10 sec. by pressing 10 sec. pad once 4. Press Micro power pad 3 times to set medium power 5.

  • Page 17: Turbo Reheat

    7. When the first stage cooking has elapsed oven automatically switches to second stage 8. When second stage cooking has elapsed oven bleeps 5 times and shuts off 4.3. Turbo Reheat 1. Place water load in the oven 2. Press the Turbo reheat button once 3.

  • Page 18: Delay Stand

    3. Enter the weight by pressing the Up & Down or more less pads. 4. Press Start 4.5. Delay Stand 1. Set power level and time 2. Press Stand 3. Set standing time 4. Press Start 4.6. Delay Start...
  • Page 19 1. Press delay 2. Set delay time 3. Set power level and time 4. Press start pad 4.7. Auto Weight Cook Programs NN-T551 1. Select the desired auto weight cook program 2. Press to select grams or pounds and ounces 3.

  • Page 20: Schematic And Wiring Diagram

    2. Press start 4.9. Demonstration Mode 1. Set demonstration mode by pressing the clock pad three times 2. Cancel demonstration mode by pressing the clock pad three times 4.10. Child Lock 1. Set the child lock by pressing the start pad three times 2.
  • Page 23 Variable power cooking Setting Output On Time Off Time Turbo 1000W High 900W Defrost 440W Medium 600W 440W Simmer 440W Warm 440W NOTE 1. The ON/OFF time ratio does not corespond with the percentage of microwave power since approximately 2 seconds are required to heat the magnetron filament.
  • Page 24 6.3. One touch Auto sensor cooking NN-T591 NN-T571 Auto sensor cook is a revolutionary way to cook by microwave without setting a power level or selecting a time. All that is necessary is to select an auto sensor program before starting to cook. Understanding Auto sensor cooking.

  • Page 25: Cautions To Be Observed When Troubleshooting

    Catergory K FACTOR POWER POWER STANDARD fresh HIGH HIGH vegetables frozen HIGH HIGH vegetables Figure 1 Auto sensor cooking 7. Cautions to Be Observed When Troubleshooting Unlike many other appliances, the microwave oven is a high voltage, high current device. Though it is free from danger in ordinary use, extreme care should be taken during repair.

  • Page 26: Inverter Warnings

    Do not operate on a two wire extension cord. The microwave oven is designed to be used when grounded. It is imperative, therefore, to ensure the appliance is properly grounded before beginning repair work. 7.2. Inverter Warnings DANGER, HIGH VOLTAGE AND HIGH TEMPERATURE (HOT/LINE) OF THE INVERTER POWER SUPPLY (U) This high voltage inverter power supply handles very high voltage and current for the magnetron tube.
  • Page 27 grounded it will expose very high voltages and cause extreme DANGER! Be sure that the inverter circuit is properly grounded via the inverter earth bracket. Figure 2 Grounding of the inverter circuit board WARNING! DISCHARGE THE HIGH VOLATGE CAPACITORS For about 30 seconds after the oven is turned off, an electric charge remains in the high voltage capacitors in the inverter power supply circuit board.

  • Page 28: Part Replacement

    Discharging the high voltage capacitors WARNING There is high voltage present with high current capabilities in the circuits of the primary and secondary windings, choke coil and heat sink of the inverter. It is extremely dangerous to work on or near these circuits with the oven energized. DO NOT measure the voltage in the high voltage circuit including the filament voltage of the magnetron.
  • Page 29 WARNING When the 10A 250V fuse is blown due to the operation of the short switch, the primary latch switch and short switch must be replaced. It is also important to change the power relay 1 (RY1) when the continuity test shows shorted contacts. 1.

  • Page 30: Sharp Edges

    When the appliance is operated with the door hinges or magnetron fixed incorrectly, the microwave leakage can reach more than 5mW/cm . After repair or exchange, it is very important to check if the magnetron and the door hinges are correctly fixed. 7.7.

  • Page 31: Inverter Power Supply (U)

    Removal of the magnetron 8.2. Inverter power supply (U) 1. Discharge the high voltage capacitors. 2. Remove two screws holding the tie bar. 3. Unplug the H.V. Lead wires from the magnetron. 4. Remove the one screw holding the earth wire to the magnetron. 5.
  • Page 32 3. Securely connect the 3 lead wire connectors. 4. Make sure that the heat sink has enough space (gap) from the oven. Take care not to touch any lead wire to the aluminium heat sink because it is hot. Figure 2 Removal of the inverter PCB.

  • Page 33: Digital Programmer Circuit (Dpc) And Membrane Key Board

    Disconnecting the PCB lock connector. 8.3. Digital Programmer Circuit (DPC) and membrane key board. NOTE: Ground any static electric built up on your body before handling the DPC. 1. Disconnect all connectors from the DPC. 2. Remove the two screws holding the escutcheon base and slide the escutcheon base upward slightly.
  • Page 34 Removal of DPC AU and DPC DU Figure 6...

  • Page 35: Low Voltage Transformer And/Or Power Relays (Ry1)

    Grounding of the stainless facia 8.4. Low voltage transformer and/or power relays (RY1) Note Be sure to ground your body to discharge any static before handling the DPC. 1. Using a solder wick or a de-soldering tool and a 30W soldering iron, carefully remove all solder from the terminal pins of the low voltage transformer and/or power relays.

  • Page 36: Fan Motor

    2. With all of the terminal pins cleaned and separated from the DPC contacts, remove the defective transformer/power relays and install the new components making sure that the terminal pins are inserted completely. Carefully re solder all terminal contacts carefully. Note Do not use a soldering iron or de soldering tool of more than 30 watts on DPC contacts...

  • Page 37: Door Disassembly

    Removing the fan motor. 8.6. Door disassembly 1. Remove door C from door E by carefully pulling outward starting from the upper right hand corner using a flat blade screwdriver. 2. Remove four screws holding the door E to the door A assembly. 3.
  • Page 38 2. Adjust so that the door has no play between the inner door surface and the oven front surface. If the door assembly is not mounted properly, microwave power may leak from the clearance between the door and oven. 3. Perform the microwave leakage test. Figure 7 Disassembly of the door.

  • Page 39: Turntable Motor

    Adjusting the door hinge. 8.7. Turntable Motor 1. Remove the motor cover by breaking off at the 8 spots indicated by the arrows. 2. Disconnect the two lead wires connected to the turntable motor. 3. Remove the turntable motor by removing the two screws. Note: After breaking off the motor cover, make sure that cut-off portions are properly trimmed off or bent inside so that no sharp edges are exposed.
  • Page 40 Removing the turntable motor cover. Figure 10...
  • Page 41 Removing the two scews fixing the turntable motor. 8.8. Steam Sensor NN-T591 NN-T571 1. Remove 1 screw holding the steam sensor unit 2. Disconnect CN7 connector for the digital programmer circuit board. 3. Remove the exhaust guide from the steam sensor unit. 4.
  • Page 42 Removing the steam sensor...

  • Page 43: Component Test Procedure

    Fitting the new sensor 9. Component Test Procedure Caution 1. High voltage is present at the high voltage terminal of the inverter unit, including the aluminium heat sink. 2. It is not necessary or advisable to attempt to measure this high voltage. 3.
  • Page 44 3. Test the continuity of the switches with the door open and closed with an ohm meter on the lowest scale. Normal continuity readings should be as followed. Door Open Door Closed Primary Latch infinite (Close) Switch (Open) Secondary infinite (Close) Latch switch (Open)

  • Page 45: Push Button Keyboard

    9.4. Push Button Keyboard Check the continuity between the switch terminals, by tapping an appropriate pad on the keyboard. The keypad matrix is shown on P.28. 9.5. Inverter Power Supply Caution DO NOT try to repair this inverter power supply). Replace as a whole H.V. Inverter Unit.

  • Page 46: Steam Sensor And Digital Programmer Circuit

    Figure 3 9.6. Inverter Power Supply Unit Warning Do not attempt to make any measurements in the high voltage circuitry of the inverter or magnetron. See troubleshooting of the inverter circuit and magnetron on P.19 to determine if the inverter power supply is still functioning. 9.7.

  • Page 47: Measurements And Adjustments

    5. T1 cooking switches the cooking time T2. 6. The cooking time T2 appears in the display window. If the following times appear the steam sensor is functioning normally. T1 TIME T2 TIME 1 MIN 30 SEC - 4 MIN 8 SEC - 23 SEC 10.
  • Page 48 recommended to test the magnetron using the simple method outlined below. Necessary equipment: 1 litre beaker. Glass thermometer. Wrist watch or stop watch. NOTE: Check the line voltage under load. Low voltage will lower the magnetron output. Take the temperature readings and heating time as accurate as possible. 1.

  • Page 49: Troubleshooting Guide

    Adjustment of latch switch assembly RATED OUTPUT TEMPERATURE RISE 1000W 8°C 11. Troubleshooting guide Caution 1. Do not try to repair this H.V. Inverter power supply. Replace as a whole unit. When returning the inverter unit pack in the original inverter box. 2.
  • Page 50 or adjust without sufficient test equiptment, this circuit handles very high volatge and current. 3. Ensure a good ground connection before beginning any troubleshooting. 4. Be careful of the high voltage circuit and take necessary precautions when troubleshooting. 5. Discharge the high voltage capacitors on the inverter. 6.

  • Page 56: Main Parts List

    Troubleshooting Inverter by Microwave Oven Input Current 12. Digital Programmer Circuit Troubleshooting Guide Figure 2 How to test the semiconductors 13. Main Parts List 1. Part numbers are indicated on most mechanical parts. Please use these part numbers for part orders. Do not use the description of the part. Important safety notice 1.

  • Page 59: Exploded View

    Part Number Part name and description Remarks Ref. No. E65854V00BP INVERTOR SUPPORT BRACKET E1008-1180 RUBBER FOOT E09020000AH CUSHION RUBBER E110D5D20HBP OUTER PANEL NN-T591WB NN-T551WB E110D5V00SBP OUTER PANEL NN-T571SB E110D4V00BP OUTER PANEL NN-T551CB E63268960JP TT MOTOR AEE2177-F80 PULLEY SHAFT WASHER E21315540AP PULLY SHAFT E30074L00GS BOTTOM HINGE...

  • Page 62: Escutcheon Base

    16. Escutcheon Base Ref. No. Part No. Part Name & Description Remarks E80724L10HBP DOOR OPENING BUTTON NN-T591WB NN-T551WB E80725D00SBP DOOR OPENING BUTTON NN-T571SB E80724L10BP DOOR OPENING BUTTON NN-T551CB E80378AOAG SPRING E80344L10HBP ESCUTCHEON BASE NN-T591WB NN-T551WB E80344L10BP ESCUTCHEON BASE NN-T551CB E800S5D30SBP ESCUTCHEON BASE ASSY NN-T571SB E81274L10BP...

  • Page 65: Key Board Matrix

    Ref. No. Part No. Part Name & Description Remarks E06014N30BP GLASS TRAY E290D5D20BP ROLLER RING UNIT E00035D20BP COOK BOOK E01695750BP SERVICE CENTER LIST E01134N30BP TRAY STYROL E01084N30BP TRAY PACKING E01025D30HBP CARTON BOX NN-T591WB E01025D30SBP CARTON BOX NN-T571SB E01025D20HBP CARTON BOX NN-T551WB E01025D20BP CARTON BOX...
  • Page 70 21.1. E603L5D30BP DPC AU Remarks Ref. No. Part No. Part Name & Description R180 ERDS2TJ361T 360R Carbon Resistor D40,D41 AESS133T-77 Diode D180-D182 AESQTLGE260T Green LED CX320 EF0EC8004T4 Ceramic Resonator SW40-SW50 EVQ11L05R Push Switch SW53-SW63 C110 C20 C40- AECU1F103Z50 10nF Chip Capacitor C220 C221 AECU1F104Z25 100nF Chip Capacitor...
  • Page 71 Remarks Ref. No. Part No. Part Name & Description ZD10 AESZMTZ5R6B Zener Diode D223 AESS133T-77 Silicon Diode AESS133T-77 Silicon Diode D220 AESS1N4003E Silicon Diode C330 ECBT1H681KB5 680PF Capacitor R25,R26 ERDS1FJ563T 56K 1/2 Watt Resistor R220 R232 ERDS2TJ103T 10K Resistor R11 R228 ERDS2TJ104T 100K Resistor R231 ERDS2TJ102T...
  • Page 72 Remarks Ref. No. Part No. Part Name & Description R180 ERDS2TJ361T 360R Carbon Resistor D40,D41 AESS133T-77 Diode D180-D182 AESQTLGE260T Green LED CX320 EF0EC8004T4 Ceramic Resonator SW41-SW44 EVQ11L05R Push Switch SW46-SW63 C110 C20 C40- AECU1F103Z50 10nF Chip Capacitor C220 C221 AECU1F104Z25 100nF Chip Capacitor C222 C224 C22 R111-113 R20...
  • Page 73 Ref. No. Part No. Part Name & Description Remarks E03525D00BP 3-Wire Inverter Connection IC25 AEICP25011HL Photocoupler IC AESTS1WBA60B Diode Bridge (600V) ECA2WHG220E 22uF 450V Electrolytic Capacitor BZ310 EFBAH20C001 2KHz Buzzer ERZV10D511CS Varistor 510V IC10 ETXMJ197X1BG Switching Power Supply...

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