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Panasonic NN-T794SF Service Manual

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Please file and use this specified manual together with the service manual for Model NN-
S560BF/WF(ORDER NO. SIMMC0001002C3).
NN-P794 NN-T794SF
NN-T784SF NN-T774SF
NN-T764SF NN-T754SF
NN-H764 NN-S754
NN-H744 NN-S744
NN-H724
APH(USA)
CPH(CANADA)
© 2004 Shanghai Matsushita Microwave Oven Co.,
Ltd. All rights reserved. Unauthorized copying and
distribution is a violation of law.
ORDER NO.SIMMC 0401003A1
Microwave Oven
E1

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  • Page 1 ORDER NO.SIMMC 0401003A1 Microwave Oven NN-P794 NN-T794SF NN-T784SF NN-T774SF NN-T764SF NN-T754SF NN-H764 NN-S754 NN-H744 NN-S744 NN-H724 APH(USA) CPH(CANADA) Please file and use this specified manual together with the service manual for Model NN- S560BF/WF(ORDER NO. SIMMC0001002C3). © 2004 Shanghai Matsushita Microwave Oven Co., Ltd.
  • Page 2 NN-P794 NN-T794SF / NN-T784SF NN-T774SF / NN-T764SF NN-T754SF / NN-H764 NN-S754 / NN-H744 NN-S744 / NN-H724...
  • Page 3 NN-P794 NN-T794SF / NN-T784SF NN-T774SF / NN-T764SF NN-T754SF / NN-H764 NN-S754 / NN-H744 NN-S744 / NN-H724...

  • Page 4: Table Of Contents

    NN-P794 NN-T794SF / NN-T784SF NN-T774SF / NN-T764SF NN-T754SF / NN-H764 NN-S754 / NN-H744 NN-S744 / NN-H724 CONTENTS Page Page 1 SCHEMATIC DIAGRAM 4.1. EXPLODED VIEW 1.1. APH 4.2. PARTS LIST 1.2. CPH 4.3. ESCUTCHEON BASE ASSEMBLY 2 MEASUREMENTS AND ADJUSTMENTS 4.4.

  • Page 5: Schematic Diagram

    NN-P794 NN-T794SF / NN-T784SF NN-T774SF / NN-T764SF NN-T754SF / NN-H764 NN-S754 / NN-H744 NN-S744 / NN-H724 1 SCHEMATIC DIAGRAM 1.1.

  • Page 6: Cph

    NN-P794 NN-T794SF / NN-T784SF NN-T774SF / NN-T764SF NN-T754SF / NN-H764 NN-S754 / NN-H744 NN-S744 / NN-H724 1.2.

  • Page 7: Measurements And Adjustments

    NN-P794 NN-T794SF / NN-T784SF NN-T774SF / NN-T764SF NN-T754SF / NN-H764 NN-S754 / NN-H744 NN-S744 / NN-H724 2 MEASUREMENTS AND ADJUSTMENTS 2.1. Adjustment of primary latch switch, secondary latch switch and short switch. 1. Mount the Primary latch switch, the Secondary latch switch and the short switch to the door hook assembly as shown in ILL.

  • Page 8: Procedure For Measuring Microwave Energy Leakage

    NN-P794 NN-T794SF / NN-T784SF NN-T774SF / NN-T764SF NN-T754SF / NN-H764 NN-S754 / NN-H744 NN-S744 / NN-H724 3 PROCEDURE FOR MEASURING MICROWAVE ENERGY LEAKAGE 3.2.1. Measurement with the outer panel removed. Whenever you replace the magnetron, measure for radiation leakage before the outer panel is installed and after all necessary components are replaced or adjusted.

  • Page 9: Exploded View And Parts List

    NN-P794 NN-T794SF / NN-T784SF NN-T774SF / NN-T764SF NN-T754SF / NN-H764 NN-S754 / NN-H744 NN-S744 / NN-H724 4 EXPLODED VIEW AND PARTS LIST 4.1. EXPLODED VIEW...

  • Page 10: Parts List

    NN-P794 NN-T794SF / NN-T784SF NN-T774SF / NN-T764SF NN-T754SF / NN-H764 NN-S754 / NN-H744 NN-S744 / NN-H724 4.2. PARTS LIST NOTE: 1. When ordering replacement part(s), please use part number(s) shown in this part list. Do not use description of the part.
  • Page 11 NN-P794 NN-T794SF / NN-T784SF NN-T774SF / NN-T764SF NN-T754SF / NN-H764 NN-S754 / NN-H744 NN-S744 / NN-H724 Ref. No. Part No. Part Name & Description Pcs/Set Remarks F65856K50AP INVERTER BRACKET P794 CPH, H7*4 APH/CPH, S7*4 APH 2M75P1-21 MAGNETRON 2M261-M32G MAGNETRON B62308250AP...

  • Page 12: Escutcheon Base Assembly

    NN-P794 NN-T794SF / NN-T784SF NN-T774SF / NN-T764SF NN-T754SF / NN-H764 NN-S754 / NN-H744 NN-S744 / NN-H724 4.3. ESCUTCHEON BASE ASSEMBLY 4.3.1. NN-H7*4 APH/CPH, NN-S7*4 APH Ref. No. Part No. Part Name & Description Pcs/Set Remarks F603L6J00AP D.P.CIRCUIT (AU) H764BF/WF APH F603L6J50AP D.P.CIRCUIT (AU)
  • Page 13 NN-P794 NN-T794SF / NN-T784SF NN-T774SF / NN-T764SF NN-T754SF / NN-H764 NN-S754 / NN-H744 NN-S744 / NN-H724 4.3.2. NN-P794 APH/CPH, NN-T7*4 APH Ref. No. Part No. Part Name & Description Pcs/Set Remarks F603L6H60AP D.P.CIRCUIT (AU) P794SF/BF/WF APH F603L6H60CP D.P.CIRCUIT (AU) P794SF/BF/WF CPH F603L6H70AP D.P.CIRCUIT (AU)

  • Page 14: Wiring Materials

    NN-P794 NN-T794SF / NN-T784SF NN-T774SF / NN-T764SF NN-T754SF / NN-H764 NN-S754 / NN-H744 NN-S744 / NN-H724 Ref. No. Part No. Part Name & Description Pcs/Set Remarks F83376H70SAP MEMBRANE SHEET T794SF APH F83376H80SAP MEMBRANE SHEET T784SF APH F83376Q30SAP MEMBRANE SHEET T774SF APH...

  • Page 15: Packing And Accessories

    NN-P794 NN-T794SF / NN-T784SF NN-T774SF / NN-T764SF NN-T754SF / NN-H764 NN-S754 / NN-H744 NN-S744 / NN-H724 4.5. PACKING AND ACCESSORIES Ref. No. Part No. Part Name & Description Pcs/Set Remarks F00036J00AP INSTRUCTION MANUAL P794SF/BF/WF APH, T794SF APH, T784SF APH, T774SF APH, T764SF APH, H764BF/WF APH...

  • Page 16: Door Assembly

    NN-P794 NN-T794SF / NN-T784SF NN-T774SF / NN-T764SF NN-T754SF / NN-H764 NN-S754 / NN-H744 NN-S744 / NN-H724 4.6. DOOR ASSEMBLY Ref. No. Part No. Part Name & Description Pcs/Set Remarks F3018-1200 DOOR KEY A F302A6H60SAP DOOR A (U) P794SF APH/CPH F302A6H60BAP...

  • Page 17: Digital Programmer Circuit

    NN-P794 NN-T794SF / NN-T784SF NN-T774SF / NN-T764SF NN-T754SF / NN-H764 NN-S754 / NN-H744 NN-S744 / NN-H724 5 DIGITAL PROGRAMMER CIRCUIT 5.1. NN-P794 APH/CPH...
  • Page 18 NN-P794 NN-T794SF / NN-T784SF NN-T774SF / NN-T764SF NN-T754SF / NN-H764 NN-S754 / NN-H744 NN-S744 / NN-H724...

  • Page 19: Nn-T794Sf Aph, Nn-T784Sf Aph, Nn-T774Sf Aph

    NN-P794 NN-T794SF / NN-T784SF NN-T774SF / NN-T764SF NN-T754SF / NN-H764 NN-S754 / NN-H744 NN-S744 / NN-H724 5.2. NN-T794SF APH, NN-T784SF APH, NN-T774SF APH...
  • Page 20 NN-P794 NN-T794SF / NN-T784SF NN-T774SF / NN-T764SF NN-T754SF / NN-H764 NN-S754 / NN-H744 NN-S744 / NN-H724...

  • Page 21: Nn-T764Sf Aph, Nn-T754Sf Aph

    NN-P794 NN-T794SF / NN-T784SF NN-T774SF / NN-T764SF NN-T754SF / NN-H764 NN-S754 / NN-H744 NN-S744 / NN-H724 5.3. NN-T764SF APH, NN-T754SF APH...
  • Page 22 NN-P794 NN-T794SF / NN-T784SF NN-T774SF / NN-T764SF NN-T754SF / NN-H764 NN-S754 / NN-H744 NN-S744 / NN-H724...

  • Page 23: Nn-H764 Aph/Cph, S754Bf/Wf Aph

    NN-P794 NN-T794SF / NN-T784SF NN-T774SF / NN-T764SF NN-T754SF / NN-H764 NN-S754 / NN-H744 NN-S744 / NN-H724 5.4. NN-H764 APH/CPH, S754BF/WF APH...
  • Page 24 NN-P794 NN-T794SF / NN-T784SF NN-T774SF / NN-T764SF NN-T754SF / NN-H764 NN-S754 / NN-H744 NN-S744 / NN-H724...

  • Page 25: Nn-H744Bf/Wf Aph, H724Bf/Wf Aph, S744Bf/Wf Aph

    NN-P794 NN-T794SF / NN-T784SF NN-T774SF / NN-T764SF NN-T754SF / NN-H764 NN-S754 / NN-H744 NN-S744 / NN-H724 5.5. NN-H744BF/WF APH, H724BF/WF APH, S744BF/WF APH...
  • Page 26 NN-P794 NN-T794SF / NN-T784SF NN-T774SF / NN-T764SF NN-T754SF / NN-H764 NN-S754 / NN-H744 NN-S744 / NN-H724...

  • Page 27: Parts List

    NN-P794 NN-T794SF / NN-T784SF NN-T774SF / NN-T764SF NN-T754SF / NN-H764 NN-S754 / NN-H744 NN-S744 / NN-H724 5.6. PARTS LIST Ref. No. Part No. Part Name & Description Pcs/Set Remarks BZ310 AEFBAT2001 BUZZER 2.0KHz C221 AECUU06F103Z CHIP CAPACITOR 0.01µF/50V C222, C486...
  • Page 28 NN-P794 NN-T794SF / NN-T784SF NN-T774SF / NN-T764SF NN-T754SF / NN-H764 NN-S754 / NN-H744 NN-S744 / NN-H724 Ref. No. Part No. Part Name & Description Pcs/Set Remarks R483, R484, R489 AERJ06J105R CHIP RESISTOR 1M, 1/10W, 5% (P794 APH/CPH, T794/T784/T774/T764SF APH, H7*4 APH/CPH)
  • Page 29 ORDER NO. SIMMC 0001002C1 Service Manual Microwave Oven MODELS Canada NN-S560BF/WF NN-S550BF/WF NN-S540BF/WF NN-L530BF NN-L530WF NN-L520WF NN-S510WF * RPH Model refer to the last page. Specifications for APH : NN-S560BF/WF NN-S550BF/WF NN-S540BF/WF NN-L530BF/WF Model: Specifications: Power Source: * 120V AC Single Phase, 60Hz Power Requirement: 1370W 1370W...
  • Page 30 5. Any serviceman who learns of any accident pertaining to microwave radiation leakage including the oven operating with open door should immediately notify the appropriate address listed below and Center for Devices and Radiological Health, DHHS. IN U.S.A. Panasonic Services Company IN PUERTO RICO (PASC) 50 Meadowland Parkway,...
  • Page 31 DANGER OF HIGH VOLTAGE AND HIGH TEMPERATURE (HOT/LIVE) OF THE INVERTER POWER SUPPLY INVERTER WARNING This Inverter board looks like a regular PCB. However, this PCB drives the magnetron tube with extremely high voltage NEW HV and high current. IT HAS: 1. Very high voltage and high current circuits. It functions the same as the high voltage transformer and high voltage capacitor in ordinary microwave ovens.

  • Page 32: Feature Chart

    FEATURE CHART NN-S560WF NN-S550WF NN-S540WF NN-S510WF MODEL FEATURE NN-S530WF NN-S520WF Three Stage Cooking Inverter Turbo Defrost Auto Reheat Inverter Auto Cook Sensor Reheat Sensor Cook Quick Min Popcorn Timer Digital Clock CONTROL PANEL NN-S560(CPH) NN-S550 NN-S560(APH) a a a a a a a a a a Inverter Auto...
  • Page 33 CONTROL PANEL NN-S540 NN-L530 NN-L520 MN-S510 Display Windows Popcorn Pad Inverter Turbo Defrost Pad (4a) Sensor Reheat Pad (4b) Auto Reheat Pad Power Level Pad Number Pads Timer Pad Clock Pad Sensor Cook Pad (10) Inverter Auto Cooking Pads (11) Quick Min Pad (12) More /Less Pad (13) Cooking Guide (14) Auto Cook Pad...

  • Page 34: Operation And Digital Programmer Circuit Test Procedure

    OPERATION AND DIGITAL PROGRAMMER CIRCUIT TEST PROCEDURE When you pluge the power supply cord into the wall outlet, microwave oven automatically enter into the state of lb / oz. If you want to use g / kg state, please press Start pad after pluging the power source. 1.
  • Page 35 8. Auto Reheat OPERATION SCROLL DISPLAY OPERATION SCROLL DISPLAY 3. Press Serving / Weight pad. (Select 4. 6. 10. 14 slices) 1. Press Auto Reheat pad twice for two servings. 4. Press Start pad. 2. Press Start pad.Auto Reheat 4.10 cycle begins time counts down.

  • Page 36: Schematic Diagrams

    SCHEMATIC DIAGRAM (APH) SCHEMATIC DIAGRAM (APH) - 7 -...
  • Page 37 SCHEMATIC DIAGRAM (CPH) SCHEMATIC DIAGRAM (CPH) - 8 -...

  • Page 38: Description Of Operating Sequence

    DESCRIPTION OF OPERATING SEQUENCE 1. Variable power cooking control Variable Power Cooking The coil of power relay B (RY1) is energized intermittently by the digital ON-OFF TIME OF OUTPUT programmer circuit, when the oven is set at any power selection except POWER RELAY B (RY1) POWER SETTING POWER(%)
  • Page 39 4. Sensor Cooking (NN-S560BFAPH/CPH NN- AUTO SENSOR COOKING/REHEAT PROCESS S560WFAPH/CPH) Auto sensor cooking 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.

  • Page 40: Cautions To Be Observed When Troubleshooting

    CAUTIONS TO BE OBSERVED WHEN TROUBLESHOOTING Unlike many other appliances, the microwave oven is high-voltage, high WARNING current equipment. Though it is free from danger in ordinary use, extreme Never touch any circuit wiring with your hand nor with an care should be taken during repair.
  • Page 41 6.Confirm after repair (A) After repair or replacement of parts, make sure that the screws of the oven, etc. are neither loose nor missing. Microwaves might leak if screws are not properly tightened. (B) Make sure that all electrical connections are tight before inserting the plug into the wall outlet.

  • Page 42: Disassembly And Parts Replacement Procedure

    DISASSEMBLY AND PARTS REPLACEMENT PROCEDURE 1. Magnetron (A) Discharge the high voltage capacitors, as mentioned and shown on page 11. (B) Remove 1 screw holding air guide c to magnetron. (C) Disconnect 2 high voltage lead wires from magnetron filament terminals. (D) Remove 4 screws holding the magnetron.
  • Page 43 5. Door assembly DOOR (A) Remove door C from door E by carefully pulling outward starting from CCREEN B upper right hand corner using a flat blade screwdriver. DOOR A (B) Separate door E from tabs on door A and remove door A. DOOR (C) Open Door E at the opening angle of approximately 10°...
  • Page 44 8. Inverter Power Supply (U) CAUTIONS WHILE REPLACING INVERTER POWER SUPPLY (U) 1. Make sure to leave the grounding plate in its place. 2. Make sure to securely tighten grounding screw from the bottom of chasis (base). 3. Securely connect 3 lead wire connectors. 4.

  • Page 45: Component Test Procedure

    COMPONENT TEST PROCEDURE 5. Inverter Power Supply (U)for USA only CAUTION NEW. H.V. DO NOT try to REPAIR this H.V. Inverter power supply 1. High voltage is present at the high voltage terminal of (U).Replace as whole H.V. Inverter(U) Unit. the High Voltage Inverter (U) including aluminum heat sink during any cook cycle.
  • Page 46 6. Steam Sensor and Digital Programmer Circuit In order to determine if the steam sensor function of the digital programmer circuit is in working order or not, do the following test. 1) Place a water load (150 cc) in the oven. 2) Tap Sensor Reheat pad.

  • Page 47: Measurements And Adjustments

    MEASUREMENTS AND ADJUSTMENTS WARNING * For continued protection against radiation hazard, SWITCH replace only with identical replacement parts(For touch m o d e l s P a r t N o . A N E 6 1 4 2 - 1 4 5 0 , T y p e N o . V-16G-3C26-M for Primary latch switch;...

  • Page 48: Procedure For Measuring Microwave Energy Leakage

    PROCEDURE FOR MEASURING MICROWAVE ENERGY LEAKAGE (B) Should the radiation leakage be more than 2 mW/cm (1mW/cm WARNING for Canada) after determining that all parts are in good Check for radiation leakage after every servicing. Should condition, functioning properly, and genuine replacement parts as listed in this manual have been used, immediately the leakage be more than 2 mW/cm (1mW/cm...

  • Page 49: Troubleshooting Guide

    TROUBLESHOOTING GUIDE CAUTION 1. Check grounding before checking for trouble. 2. Be careful of high voltage circuit. 3. Discharge high voltage capacitor. 4. When checking the 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 50 Oven does not operate and return to plugged in 1. Defective DPC Check tighten screws on escutcheon mode as soon as start pad is pressed. base bracket, D.P.C. board. Loud buzzing noise can be heard. 1. Loose fan and fan motor Turntable motor does not rotate.
  • Page 51 Troubleshooting of Inverter Circuit (U) and Magnetron NEW H.V. This oven is programmed with a self diagnostics failure code system which will help for troubleshooting. H97, H98, and H99 are the provided failure codes to indicate magnetron and inverter circuit problem areas. This section explains failure codes of H97, H98, and H99. First, you must program the DPC by pressing Clock , Time , Start , Power Level .
  • Page 52 Trouble Related to Digital Programmer Circuit SYMPTOM STEP CHECK RESULT CAUSE/CORRECTIONS No display when oven is first plugged in. Fuse pattern of DPC Normal STEP 2 Oven is dead. Open (NOTE) Shorted Circuit of ZNR, L.V.T., Oven Lamp etc. Replace DPC Low voltage transformer (LVT) Abnormal 0V ➝...

  • Page 53: Exploded View And Parts List

    EXPLODED VIEW AND PARTS LIST - 24 -...
  • Page 54 PARTS LIST NOTE 1: When ordering replacement part(s), please use part number(s) shown in this part list. Do not use description of the part. 2: Important safety notice: Components identified by mark have special characteristics important for safety. When replacing any of these components, use only manufacture’s specified parts. Pcs/ Ref.No.
  • Page 55 Pcs/ Ref.No. Part No. Part name & Description Remarks AC120V, SINGLE PHASE, 60Hz F400A4T00AP FAN MOTOR F40084T00AP FAN BLADE F40254T00AP AIR GUIDE A F41444T00AP ORIFICE F64505540AP EXHAUST GUIDE B S560*F*PH A707S4T00AP STEAM SENSOR S560*F*PH F65434T00AP SENSOR BRACKET C S560*F*PH F612E9660AP INCANDESCENT LAMP(U) 125V, 60Hz, 20W ANE6142-1450...
  • Page 56 DOOR ASSEMBLY (S-4T0) Pcs/ Ref.No. Part No. Part name & Description Remarks B3018-1480 DOOR KEY ==#A DOOR A F30014T00BAP ****BF*PH F30014T00HAP DOOR A ****WF*PH F302K4T00AP DOOR E (U) DOOR KEY SPRING B30214000AP F30854T00AP DOOR C F31454T00AP DOOR SCREEN A F31464T00BAP DOOR SCBEEN B ****BF*PH DOOR SCREEN B...
  • Page 57 ESCUTHEON BASE ASSEMBLY (S-4T0) Part name & Description Pcs/ Ref.No. Part No. Remarks S560BFAPH/S560WFAPH RTL (W/COMPONENT) F603L4T00AP D.P.CIRCUIT S560BFCPH/S560WFCPH RTL (W/COMPONENT) F603L4T00CP D.P.CIRCUIT S550BFAPH/S550WFAPH RTL (W/COMPONENT) F603L4T10AP D.P.CIRCUIT D.P.CIRCUIT S540BFAPH/S540WFAPH RTL (W/COMPONENT) F603L4T20AP F603L4T20CP D.P.CIRCUIT S540BFCPH/S540WFCPH RTL (W/COMPONENT) L530BF/WFAPH RTL (W/COMPONENT) F603L4T30AP D.P.CIRCUIT L530WF/L520WFCPH...
  • Page 58 PACKING AND ACCESORIES OVEN WALL TRAY PAD Cut into three parts when packing. FRONT VIEW ROLLER RING(U) Cut into two parts when packing. (S-4T0) Pcs/ Ref.No. Part No. Part name & Description Remarks S560BFAPH/S560WFAPH INSTRUCTION MANUAL F00034T00AP S560BFCPH/S560WFCPH INSTRUCTION MANUAL F00034T00CP S550BFAPH/S550WFAPH INSTRUCTION MANUAL...
  • Page 59 WIRING MATERIAL (S-4T0) Pcs/ Ref.No. Part No. Part name & Description Remarks LEAD WIRE HARNESS F030A4T20AP ******APH F030A4T00CP LEAD WIRE HARNESS ******CPH F030E4T00AP H.V. LEAD WIRE ******APH H.V. LEAD WIRE F030E4T00CP ******CPH - 30 -...
  • Page 60 DIGITAL PROGRAMMER CIRCUIT (NN-S560BFAPH/CPH,S560WFAPH/CPH) PARTS LIST Pcs/ Ref.No. Part No. Part name & Description Remarks BZ310 AEFB22EP20TL BUZZER 2.0KHz C12,C290,C291,C300,C301 AECUB2F104ZK CAPACITOR 0.1µF/25V C330 AECUB5C102KK CAPACITOR 0.1µF/50V C340 AECUB5F103ZK CAPACITOR 0.01µF/50V ECEA1VM471B ELECTROLYTIC CAPACITOR A 470µF/35V ECEA1CKA100B ELECTROLYTIC CAPACITOR A 10µF/16V AEEMXF01505W CONNECTOR...
  • Page 61 DIGITAL PROGRAMMER CIRCUIT (NN-S530BFAPH/CPH,S540BFAPH/CPH,S540WFAPH/CPH,L530BFAPH/CPH, L530WFAPH/CPH,L520WFAPH/CPH,L510WFAPH/CPH) PARTS LIST Pcs/ Ref.No. Part No. Part name & Description Remarks BZ310 AEFB22EP20TL BUZZER 2.0KHz C12,C290,C291,C300,C301 AECUB2F104ZK CAPACITOR 0.1MF/25V C330 AECUB5C102KK CAPACITOR 0.1MF/50V C340 AECUB5F103ZK CAPACITOR 0.01MF/50V ECA1VM471B ELECTROLYTIC CAPACITOR AL 470MF/35V ECEA1CKA100B ELECTROLYTIC CAPACITOR AL 10MF/16V AEEMXF01505W CONNECTOR...
  • Page 62 -33-...
  • Page 63 -34-...
  • Page 64 Model for Latin America & Mexico MODELS Mexico Latin America NN-S540BF/WF NN-540BF/WF * This product is based on NN-S540BF/WF APH model, the different parts are listed as followings: * Any serviceman who has any quiries or order service parts, please contact own area’s service company Pcs/ Ref.No.

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