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Panasonic NN-S252BF APH, Service Manual

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Panasonic NN-S252BF APH Service Manual Download Page 45

Ref. No.

Part No.

Part Name & Description

Pcs/Set

Remarks

71

F03345H20CP

MENU LABEL

1

S252BF/WF CPH

16. DOOR ASSEMBLY

Ref. No.

Part No.

Part Name & Description

Pcs/Set

Remarks

D1

F3018-1200

DOOR KEY A

1

D2

 

F302A5H00AP

DOOR A (U)

1

S262SF

D2

 

F302A5H00BAP DOOR A (U)

1

S262BF, S252BF

D2

 

F302A5H00HAP DOOR A (U)

1

S262WF, S252WF

D3

 

F302K5H00AP

DOOR E (U)

1

D4

F30214000AP

DOOR KEY SPRING

1

D5

 

F30855H00AP

DOOR C

1

D6

 

F31455H00AP

DOOR SCREEN A

1

D7

F02459660AP

DHHS LABEL

1

APH

D7

F04114180CP

DHHS LABEL

1

CPH

17. WIRING MATERIALS

43

Summary of Contents for NN-S252BF APH

Page 1: ...ORDER NO SIMMC 0203005C1 E2 Microwave Oven NN S262SF NN S262BF NN S262WF NN S252BF NN S252WF APH USA CPH CANADA SPECIFICATIONS 2002 Shanghai Matsushita Microwave Oven Co Ltd All rights 1 ...

Page 2: ... wire etc through any holes in the unit during operation 18 8 6 Confirm after repair 19 9 DISASSEMBLY AND PARTS REPLACEMENT PROCEDURE 20 9 1 Magnetron 20 9 2 Digital programmer circuit DPC and membrane key board 20 9 3 Low voltage transformer and or power relays RY1 RY2 21 9 4 Inverter power supply U 22 9 5 Door assembly 24 9 6 Stirrer motor 25 9 7 Blower motor U 25 9 8 Fan motor A for H V inverte...

Page 3: ...acturer 33 13 TROUBLESHOOTING GUIDE 34 13 1 Trouble related to digital programmer circuit 36 13 2 Troubleshooting of inverter circuit U and magnetron NEW H V 38 13 3 How to check the semiconductors using an OHM meter 38 14 EXPLODED VIEW AND PARTS LIST 39 15 PARTS LIST 39 16 DOOR ASSEMBLY 43 17 WIRING MATERIALS 43 18 ESCUTCHEON BASE ASSEMBLY 44 19 PACKING AND ACCESORIES 45 20 DIGITAL PROGRAMMER CIR...

Page 4: ...reserved Unauthorized copying and distribution is a violation of law 2 ...

Page 5: ...3 ...

Page 6: ...4 ...

Page 7: ...5 ...

Page 8: ...ive Stage Cooking O O Inverter Turbo Defrost O O Sensor Reheat O Sensor Cooking O Auto Reheat O Inverter Auto Cooking O Quick Min O O Popcorn O O Digital Clock O O Timer O O Child Safety Lock O O Vent Fan O O Cooktop Light O O 2 CONTROL PANEL APH 6 ...

Page 9: ...3 CONTROL PANEL CPH 7 ...

Page 10: ...4 OPERATION AND DIGITAL PROGRAMMER CIRCUIT TEST PROCEDURE 4 1 To set clock 8 ...

Page 11: ... TOD has now been resistered into the digital programmer circuit and will count up by minutes 4 2 Time cooking for two stage OPERATION SCROLL DISPLAY 1 Place a water load in the oven 2 Press Power Level pad once to set High power 1st stage 3 Set for 5 seconds by pressing Number pads 5 sec 5 4 Press Power Level pad 6 times to set Medium power 2nd stage 5 Set for 1 minute by pressing Number pads 1 M...

Page 12: ...eeps 5 times and shuts off Time of day or colon if set appears in the display 4 3 Inverter turbo defrost OPERATION SCROLL DISPLAY 1 Press Inverter Turbo Defrost Pad INVERTER TURBO DEFROST SET WEIGHT 2 Set the weight for 1 lb by pressing Number pads 1 Ib 1 0 3 Press Start pad 4 Press Stop Reset Pad twice Oven shuts off Time of day or colon if set appears in the display 4 4 Inverter auto cooking 10 ...

Page 13: ...ing time has elapsed Oven beeps 5 times and shuts off Time of day or colon if set appears in the display 4 5 Popcorn OPERATION SCROLL DISPLAY 1 Press Popcorn pad once for 3 5 oz serving Select 3 5 3 0 2 85 2 65 1 75 oz 2 Press Start pad When cooking time has elapsed Oven beeps 5 times and shuts off Time of day or colon if set appears in the display 4 6 Auto reheat 11 ...

Page 14: ...s elapsed Oven beeps 5 times and shuts off Time of day or colon if set appears in the display 4 7 Power level Press Power Level Power Level Display Window once P10 HIGH P10 twice P9 P9 3 times P8 P8 4 times P7 MED HIGH P7 5 times P6 MEDIUM P6 6 times P5 P5 7 times P4 P4 8 times P3 MEDIUM LOW P3 9 times P2 P2 10 times P1 LOW P1 5 SCHEMATIC DIAGRAM APH 12 ...

Page 15: ...6 SCHEMATIC DIAGRAM CPH 13 ...

Page 16: ...er cooking control High Voltage Inverter Power supply U controls output power by the signal from Digital Programmer Circuit DPC Power relay stays ON for P4 to P10 and For P1 to P3 both inverter drive signal and power relay to control output power NOTE 14 ...

Page 17: ...V 60Hz is rectified to DC voltage immediately 2 DC voltage will be supplied to the switching devices called IGBT These devices will be switched ON OFF by the 20 to 40 kHz PWM pulse width modulation signal from the microcomputer in the DPC 3 This drives the High voltage transformer to increase up to 2 000V AC and approximately 3V AC by means of transformer 4 Then the half wave doubler voltage recti...

Page 18: ...cuit Inverter Turbo Defrost WEIGHT SELECTED COOKING TIME 1 0LB 5 min 28 sec 8 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 CAUTION Servicemen should remove their watches whenever working close to or replacing the magnetron 8...

Page 19: ...cing and replacing WARNING OF INVERTER POWER SUPPLY U GROUNDING Check the High Voltage Inverter Power Supply circuit grounding This High Voltage Inverter Power Supply circuit board must have a proper chassis ground by the grounding 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 g...

Page 20: ...G When the 18 Amp fuse if blown due to the operation of short switch you must replace Primary latch switch and short switch Also replace power relay B RY1 when the continuity check reads shorted contacts 1 2 1 This is mandatory Refer to Measurements and Adjustments for these switches 2 When replacing the fuse confirm that it has the appropriate rating for these models 3 When replacing faulty switc...

Page 21: ...rews are not properly tightened 2 Make sure that all electrical connections are tight before inserting the plug into the wall outlet 3 Check for microwave energy leakage Refer to procedure for measuring microwave energy leakage CAUTION MICROWAVE RADIATION DO NOT BECOME EXPOSED TO RADIATION FROM THE MICROWAVE GENERATOR OR OTHER PARTS CONDUCTING MICROWAVE ENERGY 19 ...

Page 22: ...e the high voltage capacitor 2 Disconnect 2 connectors from fan motor B 3 Remove 4 screws holing fan motor B U assembly 4 Remove 3 screws which holding exhaust guide U onto oven 5 Tilt exhaust guide U 6 Remove 1 screw holding air guide A and then remove air guide A 7 Remove 2 high voltage lead wires from magnetron filament terminal 8 Remove 4 screws holding magnetron NOTE After replacing the magne...

Page 23: ...e key board completely from escutcheon base NOTE 1 The membrane key board is attached to the escutcheon base with double faced adhesive tape Therefore applying hot air such as using a hair dryer is recommended for smoother removal 2 When installing new membrane key board make sure that the surface of escutcheon base is cleaned sufficiently so that any problems shorted contacts or uneven surface ca...

Page 24: ...TIONS 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 Make sure the heat sink has enough space gap from the oven Take special care not to touch any lead wire to the aluminum heat sink because it is hot 1 Remove 1 screw holding orif...

Page 25: ... make Inverter bracket flat and then remove orifice 9 Release 2 tabs on the Inverter bracket and make flat 10 Unplug 3 connector on H V Inverter U 11 Remove 3 screws holding H V Inverter U onto Inverter bracket 12 Remove 1 screw holding grounding Plate on the H V Inverter U 23 ...

Page 26: ...y spring 5 Open Door E at the opening angle of approximately 10 Note The door cannot be removed if the opening angle is greater than 10 6 Remove the door E from its hinges by pushing the door E s bottom upward and out 7 Replace other components NOTE Door alignment is critical If door is misaligned apply pressure until alignment is achieved NOTE After replacement of the defective component parts of...

Page 27: ...g stirrer motor 7 Release from retainer tab by turn spinning certain angle remove stirrer motor 9 7 Blower motor U 1 Disconnect 1 connector from blower motor U 2 Remove 2 screws which holding blower motor U on the oven 3 Remove blower motor U 9 8 Fan motor A for H V inverter U cooling Disassembly procedure step 1 8 same as above H V Inverter U 9 Pull out fan blade 10 Remove 2 screws which holding ...

Page 28: ... lead wires from fan motor B terminals 2 Remove 4 screws holing fan motor B U Assembly 3 Remove 4 screws which holding fan case installation plate on the fan case C 4 From interior of fan case C remove 2 screws holding fan motor B 9 10 Turntable motor 26 ...

Page 29: ...nts or wiring always unplug the oven from its power source and discharge the high voltage capacitors 10 1 Primary latch switch secondary secondary latch switch and power relay B interlocks 1 Unplug the lead connectors to Power Relay B and verify continuity of the power relay B 1 2 terminals 2 Unplug lead connectors to Primary Latch Switch and Secondary Latch Switch 3 Test the continuity of switche...

Page 30: ...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 filament terminal and magnetron case should read open 10 4 Membrane key board Membrane switch assembly Check continuity between switch terminals by tapping an appropriate pad on the key board The contacts assignment of the respective pads on ...

Page 31: ... wire connector CN703 from magnetron tube 4 Program oven at High power for 1 minute and press start A After approximately 23 seconds oven stops B During oven operation input current is approximately 0 5 to 1A If both a and b are OK please proceed to test 2 INPUT AMPERE FAILURE CODE Unplug CN703 0 5 to 1A Oven stops in 23 seconds after started Test2 Continued from Test 1 1 Unplug 3 pin connector CN...

Page 32: ...h and the short switch to the door hook assembly as shown in table NOTE No specific adjustment during installation of Primary latch switch Secondary latch switch and short switch to the door hook is necessary 2 When mounting the door hook assembly to the oven assembly adjust the door hook assembly by moving it in the direction of arrow in the illustration so that the oven door will not have any pl...

Page 33: ...t watch or stopwatch NOTE Check the line voltage under load Low voltage will lower the magnetron output Take the temperature readings and heating time as accurately as possible 1 Fill the beaker with exactly one liter of tap water Stir the water using the thermometer and record the beaker s temperature recorded as T1 2 Place the beaker on the center of glass cook plate Set the oven for High power ...

Page 34: ...rnment standard is 5 mW cm2 while in the customer s home 2mW cm2 stated here is our own voluntary standard 1mW cm2 for Canada 12 1 Equipment Electromagnatic radiation monitor Glass thermometer 212 F or 100 C 600cc glass beaker 12 2 Procedure for measuring radiation leakage Note before measuring Do not exceed meter full scale deflection Leakage monitor should initially be set to the highest scale T...

Page 35: ... around the magnetron WARNING Avoid contacting any high voltage parts 12 2 2 Measurements with a fully assembled oven After all components including outer panel are fully assembled measure for radiation leakage around the door periphery the door viewing window the exhaust opening and air inlet openings 12 3 Record keeping and notification after measurement After any adjustment or repair to a micro...

Page 36: ...13 TROUBLESHOOTING GUIDE 34 ...

Page 37: ...operating procedures in order to find the exact cause of any trouble SYMPTOM CAUSE CORRECTIONS 1 Oven is dead 1 2 3 4 Open or loose lead wire harness Open thermal cutout Magnetron Open low voltage transformer Defective DPC Check fan motor when thermal cutout is defective Fuse is OK No display and no operation at all 2 No display and no operation at all Fuse is blown 1 2 Shorted lead wire harness D...

Page 38: ...latch switch Adjust door and latch switches 3 Defective secondary latch switch 7 Microwave output is low Oven takes longer time to cook food 1 Decrease in power source voltage Consult electrician 2 Open or loose wiring of magnetron filament circuit Intermittent oscillation 3 Aging change of magnetron 8 Fan motor turns on and turntable rotates when door is opened 1 Shorted primary latch switch 9 Ov...

Page 39: ...e time of these repairs make visual inspection of the varistor for burning damage and examine the transformer with tester for the presence of layer short circuit check primary coil resistanc If any abnormal condition is detected replace the defective parts No key input 1 Membrane switch continuity Abnormal Membrane switch Normal IC 1 No beep sound 1 IC 1 pin 8 voltage Abnormal IC 1 Normal BUZZER Q...

Page 40: ...is 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 Timer Start Power Level Program unit for operation H97 H98 H99 appears in display window a...

Page 41: ...13 3 How to check the semiconductors using an OHM meter 14 EXPLODED VIEW AND PARTS LIST 39 ...

Page 42: ...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 40 ...

Page 43: ...1 E3136 8000BP HOOK LEVER A 1 12 E31374830AP HOOK LEVER B 1 13 E31384830AP HOOK LEVER C 1 14 F40015H00AP FAN MOTOR A 1 FOR INVERTER U COOLING 15 F40085H00AP FAN BLADE 1 FOR INVERTER U COOLING 16 F40255H00AP ORIFICE 1 17 F401W5H00AP BLOWER MOTOR U 1 18 F42485H00AP FAN CASE C 1 19 F41585H00AP FAN CASE INSTALLATION PLATE 1 20 F42505H00AP SIROCCO FAN C 1 21 F42675H00AP FAN MOTOR B 1 FOR MAGNETRON COOL...

Page 44: ...ECONDARY LATCH SWITCH L 3C2 2 50 A61785180AP MICROSWITCH 1 SHORT SWITCH L 2C2 2 51 F61455H00AP THERMAL CUTOUT 1 52 F61455E60XN THERMAL CUTOUT 3 53 A606Y4T00AP H V INVERTER U 1 APH 53 A606Y4T00CP H V INVERTER U 1 CPH 54 2M261 M32F MAGNETRON 1 APH 54 2M261 M32G MAGNETRON 1 CPH 55 B62308250AP FUSE 1 18A 125V 56 B62314000AP FUSE HOLDER 1 APH 57 J692Y4T00CP NOISE FILTER U 1 CPH 58 F82605H00AP NOISE FIL...

Page 45: ...Set Remarks D1 F3018 1200 DOOR KEY A 1 D2 F302A5H00AP DOOR A U 1 S262SF D2 F302A5H00BAP DOOR A U 1 S262BF S252BF D2 F302A5H00HAP DOOR A U 1 S262WF S252WF D3 F302K5H00AP DOOR E U 1 D4 F30214000AP DOOR KEY SPRING 1 D5 F30855H00AP DOOR C 1 D6 F31455H00AP DOOR SCREEN A 1 D7 F02459660AP DHHS LABEL 1 APH D7 F04114180CP DHHS LABEL 1 CPH 17 WIRING MATERIALS 43 ...

Page 46: ...ion Pcs Set Remarks W1 F030A5H00AP LEAD WIRE HARNESS 1 APH W1 F030A5H00CP LEAD WIRE HARNESS 1 CPH W2 F030E5H00AP H V LEAD WIRE 1 APH W2 F030E5H00CP H V LEAD WIRE 1 CPH W3 F03535H00AP LEAD WIRE HARNESS U 1 18 ESCUTCHEON BASE ASSEMBLY 44 ...

Page 47: ... 1 S252WF CPH E3 F80345H10BAP ESCUTCHEON BASE 1 S262BF S252BF E3 F80345H10HAP ESCUTCHEON BASE 1 S262WF S252WF E4 F80725H10BAP DOOR OPENING BUTTON 1 S262BF S252BF E4 F80725H10HAP DOOR OPENING BUTTON 1 S262WF S252WF E5 F80375950AP OPENING BUTTON SPRING 1 E6 F82565H00AP DOOR OPENING LEVEL 1 E7 F81275H00AP BACK PLATE 1 E8 F00075H00AP NAME PLATE 1 S262SF APH E8 F00075H10BAP NAME PLATE 1 S262BF APH E8 F...

Page 48: ...10HCP PACKING CASE PAPER 1 S262WF CPH P2 F01025H20BCP PACKING CASE PAPER 1 S252BF CPH P2 F01025H20HCP PACKING CASE PAPER 1 S252WF CPH P3 F01045H00AP UPPER FILLER 1 P4 F01055H00AP LOWER FILLER 1 P5 F01065H00AP P E BAG 1 P6 F01075H00AP DOOR SHEET 1 P7 A06015H00AP COOKING TRAY 1 P8 F01175H00AP TRAY PACKING B 1 S262SF BF WF P9 F01485H00AP REINFORCE BRACKET 2 P10 F01085H00AP TRAY PACKING 1 P11 F01925H0...

Page 49: ...20 DIGITAL PROGRAMMER CIRCUIT SCHEMATIC DIAGRAM 47 ...

Page 50: ...21 DIGITAL PROGRAMMER CIRCUIT PARTS LIST 48 ...

Page 51: ... 77 DIODE 5 D585 AEDNRB721Q DIODE 1 D312 AEDNRB721Q DIODE 1 S262SF BF WF D25 AERZ271KD10A VARISTOR 1 D26 D27 AERZ102KD10A VARISTOR 2 CPH D28 AERZ241KD07A ZENER DIODE 1 D180 D181 D182 D183 D184 D185 D186 D187 D188 D189 AESQSML210MT CHIP LED 10 IC1 MN101C54CDW L S I 1 IC220 AEICU2004GR IC 1 IC480 AEICUPC358G2 IC 1 S262SF BF WF IC25 AEICR29MF1 IC 1 IC10 AEIC78L05J T IC 1 IC221 AEICBU2090F IC 1 S262SF...

Page 52: ...85 AERJ06J471R CHIP RESISTOR 1 470 1 16W 5 S262SF BF WF R360 AERJ06J472R CHIP RESISTOR 1 4 7K 1 16W 5 R593 AERJ06J472R CHIP RESISTOR 1 4 7K 1 16W 5 S262SF BF WF R592 AERJ06J473R CHIP RESISTOR 1 47K 1 16W 5 R574 AERJ06J624R CHIP RESISTOR 1 620K 1 16W 5 S262SF BF WF R571 AERJ06J753R CHIP RESISTOR 1 75K 1 16W 5 S262SF BF WF R14 R180 AERDY2TJ103T CARBON FILM RESISTOR 2 10K 1 4W 5 R228 R290 AERDY2TJ104...

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