Panasonic NN-P994 Service Manual
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Panasonic NN-P994 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-P994 NN-T994SF
NN-T984SF NN-T964SF
NN-H964 NN-H944
NN-H934 NN-H924
NN-H914 NN-S954
NN-S944 NN-S934
NN-S924 NN-S914
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 0401005A1
Microwave Oven
E1

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  • Page 1 ORDER NO.SIMMC 0401005A1 Microwave Oven NN-P994 NN-T994SF NN-T984SF NN-T964SF NN-H964 NN-H944 NN-H934 NN-H924 NN-H914 NN-S954 NN-S944 NN-S934 NN-S924 NN-S914 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-P994 NN-T994SF...
  • Page 3 NN-P994 NN-T994SF...

  • Page 4: Table Of Contents

    4.6. DOOR ASSEMBLY 2.2. Measurement of microwave output 5 DIGITAL PROGRAMMER CIRCUIT 3 PROCEDURE FOR MEASURING MICROWAVE ENERGY 5.1. NN-P994 APH/CPH LEAKAGE 5.2. NN-T994SF APH, T984SF APH 3.1. Equipment 5.3. NN-T964SF APH 3.2. Procedure for measuring radiation leakage 5.4.

  • Page 5: Schematic Diagram

    NN-P994 NN-T994SF 1 SCHEMATIC DIAGRAM 1.1.

  • Page 6: Cph

    NN-P994 NN-T994SF 1.2.

  • Page 7: Measurements And Adjustments

    NN-P994 NN-T994SF 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-P994 NN-T994SF 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. Special care should be taken in measuring around the magnetron.

  • Page 9: Exploded View And Parts List

    NN-P994 NN-T994SF 4 EXPLODED VIEW AND PARTS LIST 4.1. EXPLODED VIEW...

  • Page 10: Parts List

    NN-P994 NN-T994SF 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. 2. Important safety notice: Components identified by mark have special characteristics important for safety.
  • Page 11 NN-P994 NN-T994SF Ref. No. Part No. Part Name & Description Pcs/Set Remarks F612E4W00AP INCANDESCENT LAMP (U) 125V, 60Hz, 20W J61424T00AP MICRO SWITCH (PRIMARY LATCH SWITCH) (V-15G-3C25) J61414T00AP MICRO SWITCH (SECONDARY LATCH SWITCH) (D3V-16G-3C25) F61455L00CP THERMAL CUTOUT 105°C F66264W00AP THERMAL CUTOUT...

  • Page 12: Escutcheon Base Assembly

    NN-P994 NN-T994SF 4.3. ESCUTCHEON BASE ASSEMBLY 4.3.1. NN-H9*4 APH/CPH, NN-S9*4 APH Ref. No. Part No. Part Name & Description Pcs/Set Remarks F603L6G30AP D.P.CIRCUIT H964BF/WF APH F603L6G60AP D.P.CIRCUIT H944BF/WF/BFW/WFW APH, H924BF/WF/BFW/WFW APH F603L6G30CP D.P.CIRCUIT H964BF/WF CPH F603L6G40AP D.P.CIRCUIT S954BF/WF APH F603L6G70AP D.P.CIRCUIT...
  • Page 13 NN-P994 NN-T994SF 4.3.2. NN-P994 APH/CPH, NN-T9*4 APH Ref. No. Part No. Part Name & Description Pcs/Set Remarks F603L6G00AP D.P.CIRCUIT (AU) P994 APH F603L6G00CP D.P.CIRCUIT (AU) P994 CPH F603L6G10AP D.P.CIRCUIT (AU) T994SF APH, T984SF APH F603L6Q00AP D.P.CIRCUIT (AU) T964SF APH F800L4M60BCP...

  • Page 14: Wiring Materials

    NN-P994 NN-T994SF Ref. No. Part No. Part Name & Description Pcs/Set Remarks F800L6G00BAP CONTROL PANEL (AU) P994BF APH F800L6G00HAP CONTROL PANEL (AU) P994WF APH F800L6G00SCP CONTROL PANEL (AU) P994SF CPH F800L6G00BCP CONTROL PANEL (AU) P994BF CPH F800L6G00HCP CONTROL PANEL (AU)

  • Page 15: Packing And Accessories

    NN-P994 NN-T994SF 4.5. PACKING AND ACCESSORIES Ref. No. Part No. Part Name & Description Pcs/Set Remarks F00036J00AP INSTRUCTION MANUAL P994SF/BF/WF APH, T9*4SF APH, H964BF/WF APH F00036J00CP INSTRUCTION MANUAL P994SF/BF/WF CPH, H964BF/WF CPH F00036J30AP INSTRUCTION MANUAL S954BF/WF APH F00036J50AP INSTRUCTION MANUAL...

  • Page 16: Door Assembly

    NN-P994 NN-T994SF Ref. No. Part No. Part Name & Description Pcs/Set Remarks F01026H30BAP PACKING CASE, PAPER S924BF APH F01026H30HAP PACKING CASE, PAPER S924WF APH F01026H50BAP PACKING CASE, PAPER S914BF APH F01026H50HAP PACKING CASE, PAPER S914WF APH F01026H10BAP PACKING CASE, PAPER...

  • Page 17: Digital Programmer Circuit

    NN-P994 NN-T994SF 5 DIGITAL PROGRAMMER CIRCUIT 5.1. NN-P994 APH/CPH...
  • Page 18 NN-P994 NN-T994SF...

  • Page 19: Nn-T994Sf Aph, T984Sf Aph

    NN-P994 NN-T994SF 5.2. NN-T994SF APH, T984SF APH...
  • Page 20 NN-P994 NN-T994SF...

  • Page 21: Nn-T964Sf Aph

    NN-P994 NN-T994SF 5.3. NN-T964SF APH...
  • Page 22 NN-P994 NN-T994SF...

  • Page 23: H964Bf/Wf Aph, H964Bf/Wf Cph, S954Bf/Wf Aph

    NN-P994 NN-T994SF 5.4. H964BF/WF APH, H964BF/WF CPH, S954BF/WF APH...
  • Page 24 NN-P994 NN-T994SF...

  • Page 25: H944Bf(W)/Wf(W) Aph, H934Bf/Wf Aph, H924Bf(W)/Wf(W) Aph, S944Bf(W)/Wf(W) Aph, S924Bf(W)/Wf(W) Aph, S914Bf/Wf Aph

    NN-P994 NN-T994SF 5.5. H944BF(W)/WF(W) APH, H934BF/WF APH, H924BF(W)/WF(W) APH, S944BF(W)/WF(W) APH, S924BF(W)/WF(W) APH, S914BF/WF APH...
  • Page 26 NN-P994 NN-T994SF...

  • Page 27: Parts List

    NN-P994 NN-T994SF 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 AECUU06F103Z CHIP CAPACITOR 0.01µF/50V (P994 APH/CPH, T994/T984SF APH) C484 AECUU06F103Z CHIP CAPACITOR 0.01µF/50V (P994 APH/CPH, T9*4SF APH, H9*4 APH/CPH)
  • Page 28 NN-P994 NN-T994SF Ref. No. Part No. Part Name & Description Pcs/Set Remarks R488, R491 AERJ06J202R CHIP RESISTOR 2K, 1/10W, 5% (P994 APH/CPH, T9*4SF APH, H9*4 APH/CPH) 22Ω Ω Ω Ω , 1/10W, 5% R320 AERJ06J220R CHIP RESISTOR 22Ω Ω Ω Ω , 1/10W, 5% (P994 APH/CPH, T9*4SF APH,...
  • 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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