Panasonic NE-1257CR Service Manual Download | Manualshive

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32 DIGITAL PROGRAMMER CIRCUIT

SCHEMATIC DIAGRAM

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NE-1257R/NE-1257CR / NE-1757R/NE-1757CR / NE-2157R/NE-2157CR / NE-1258R

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Summary of Contents for NE-1257CR

Page 1: ...ctric Industrial Co Ltd All rights reserved Unauthorized copying and distribution is a violation of law NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258R Commercial Microwave Oven ORDER NO MOD0009238C1 E10 ...

Page 2: ...AM NE 1257CR 12 6 SCHEMATIC DIAGRAM NE 1757R 13 7 SCHEMATIC DIAGRAM NE 1757CR 14 8 SCHEMATIC DIAGRAM NE 2157R 15 9 SCHEMATIC DIAGRAM NE 2157CR 16 10 WIRING DIAGRAM NE 1257R NE 1258R 17 11 WIRING DIAGRAM NE 1257CR 18 12 WIRING DIAGRAM NE 1757R 19 13 WIRING DIAGRAM NE 1757CR 20 CONTENTS Page Page 2 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258R ...

Page 3: ...32 21 PROCEDURE FOR MEASURING MICROWAVE ENERGY LEAKAGE 33 22 TROUBLESHOOTING GUIDE 35 23 EXPLODED VIEW AND PARTS LIST 36 24 PARTS LIST 37 25 DOOR ASSEMBLY 40 26 ESCUTCHEON BASE ASSEMBLY 41 27 PACKING AND ACCESSORIES 42 28 WIRING MATERIAL 43 29 REF NO 89 L V TRANSFORMER U 44 30 REF NO 58 NOISE FILTER U 44 31 REF NO E2 P C BOARD U 45 32 DIGITAL PROGRAMMER CIRCUIT 46 33 DIGITAL PROGRAMMER CIRCUIT 48 ...

Page 4: ...1 OUTLINE DIAGRAM 4 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258R ...

Page 5: ...2 OPERATION PROCEDURE 5 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258 ...

Page 6: ...6 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258R ...

Page 7: ...7 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258 ...

Page 8: ...8 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258R ...

Page 9: ...9 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258 ...

Page 10: ...voltage selector connector on the back of the oven is set for your power supply Connecting oven to 230 volt line with 208 voltage setting is dangerous and may result in overheating of the electrical components thus shortening their life expectancy or possibly causing a fire or other accident Connecting oven to 230 volt line with 208 voltage will lower the power output of the oven resulting in slow...

Page 11: ...4 SCHEMATIC DIAGRAM NE 1257R NE 1258R 11 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258 ...

Page 12: ...5 SCHEMATIC DIAGRAM NE 1257CR 12 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258R ...

Page 13: ...6 SCHEMATIC DIAGRAM NE 1757R 13 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258 ...

Page 14: ...7 SCHEMATIC DIAGRAM NE 1757CR 14 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258R ...

Page 15: ...8 SCHEMATIC DIAGRAM NE 2157R 15 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258 ...

Page 16: ...9 SCHEMATIC DIAGRAM NE 2157CR 16 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258R ...

Page 17: ...10 WIRING DIAGRAM NE 1257R NE 1258R NOTE When replacing check the lead wire color as shown 17 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258 ...

Page 18: ...11 WIRING DIAGRAM NE 1257CR NOTE When replacing check the lead wire color as shown 18 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258R ...

Page 19: ...12 WIRING DIAGRAM NE 1757R NOTE When replacing check the lead wire color as shown 19 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258 ...

Page 20: ...13 WIRING DIAGRAM NE 1757CR NOTE When replacing check the lead wire color as shown 20 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258R ...

Page 21: ...14 WIRING DIAGRAM NE 2157R NOTE When replacing check the lead wire color as shown 21 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258 ...

Page 22: ...15 WIRING DIAGRAM NE 2157CR NOTE When replacing check the lead wire color as shown 22 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258R ...

Page 23: ...rcuit controls the ON OFF time of the power relay A and B contacts in order to vary the output power of the microwave oven One complete ON and OFF cycle of the power relay is 44 seconds The relation between indications on the control panel and the output power of the microwave oven is as shown in Figure 16 DESCRIPTION OF OPERATING SEQUENCE 23 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157C...

Page 24: ... operated with any of these parts in imperfect condition hazardous microwave leakage might occur 17 3 Warning about the electric charge in the high voltage capacitor For about 30 seconds after the oven is turned off an electric charge remains in the high voltage capacitor When replacing or checking parts remove the power plug from the outlet wait 30 seconds and short the terminal of the high volta...

Page 25: ...all electrical connections are tight before inserting the plug into the wall outlet 17 6 Avoid inserting nails wire etc through holes in unit during operation Never insert a wire nail or any other metal object through the lamp holes on the cavity or any other holes or gaps because such objects may work as an antenna and cause microwave leakage 25 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2...

Page 26: ... on the high voltage capacitors 2 Remove the entire rear panel by removing screws as shown 3 Carefully place the unit on its left side H V Capacitor side 4 Remove the cover by removing 2 screws 5 Remove the 4 screws holding magnetron by inserting screwdriver through the 4 openings on bottom plate 6 Remove 2 screws holding thermal cutout 7 Remove the mounting bracket from magnetron and install it o...

Page 27: ...ove the power supply P C B together with its mounting bracket by first removing the 2 bracket holding screws 3 The power supply P C B can be separated from mounting bracket by removing the 2 L V T holding screws and unfastening the plastic clips 18 3 Replacement of digital programmer circuit board 1 Remove grounding screw for membrane switch and D P C ground 2 Remove 3 screws holding control panel...

Page 28: ...n clockwise to unhook the tabs and pull off 18 5 Replacement of floor shelf and lower antenna 1 To remove the floor shelf insert a screwdriver through the small opening on the left side of the oven cavity and carefully lift the floor shelf 2 For removal of lower antenna use the same procedure as upper antenna 18 6 Replacement of temperature sensor Thermal protector 1 Cut 2 lead wires at the top of...

Page 29: ... E by carefully freeing catch hooks 5 Remove door key door key lever door key spring and handle pins from door E 6 Assemble the door by taking the above steps in a reverse order Replacement 1 When mounting the door to the oven be sure to adjust the door parallel to the bottom line of the oven face plate by moving the upper hinge and lower hinge in the direction necessary for proper alignment 2 Adj...

Page 30: ...om the circuit by disconnecting the leads 2 With the ohmmeter set on the highest resistance scale measure the resistance across the diode terminals Reverse the meter leads and again observe the resistance reading Meter with 6V 9V or higher voltage batteries should be used to check the front to back resistance of the diode otherwise an infinite resistance may be read in both directions A normal dio...

Page 31: ...mal protector will operate at 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 go to reset mode The cooking program can be reset after cool down THERMISTOR RESISTANCE VALUE 30K 120K at 10 C 30 C 50 F 86 F 31 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE ...

Page 32: ...onitor circuit and all latch switches again 20 2 Measurement of microwave output The power output of the magnetron can be determined by performing IEC standard test procedures However due to the complexity of IEC test procedures it is recommended to test the magnetron using the simple method outlined below Necessary Equipment 1 liter beaker Glass thermometer Celsius scale Wrist watch or stopwatch ...

Page 33: ...illating measure the leakage by holding the probe perpendicular to the surface being measured 1 Measurement with the outer pane 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 when measuring around the magnetron 2 Measurements with a fully assembled ...

Page 34: ...34 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258R ...

Page 35: ...22 TROUBLESHOOTING GUIDE 35 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258 ...

Page 36: ...23 EXPLODED VIEW AND PARTS LIST 36 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258R ...

Page 37: ...2 ANE0911000MG CUSHION RUBBER B 1 13 ANE000Z000AA CUSHION RUBBER C 10 13 ANE000Z000AA CUSHION RUBBER C 10 13 ANE000Z000AA CUSHION RUBBER C 10 13 ANE000Z000AA CUSHION RUBBER C 10 13 ANE000Z000AA CUSHION RUBBER C 10 13 ANE000Z000AA CUSHION RUBBER C 10 13 ANE000Z000AA CUSHION RUBBER C 10 13 ANE000Z000AA CUSHION RUBBER C 10 13 ANE000Z000AA CUSHION RUBBER C 10 14 ANE000Z000AD CUSHION RUBBER C 4 NE 1257...

Page 38: ...CUTOUT 2 57 ANE61458U0AP THERMAL CUTOUT 2 58 A605S3650CP PC BOARD H U 1 NE 1257CR 58 A605S3660CP PC BOARD H U 1 NE 1757CR NE 2157CR 59 ANE60708U0BP INSULATION SHEET A 1 60 A60713310BP INSULATION SHEET B 1 61 A60903650AP H V CAPACITOR 2 NE 1257CR NE 1257R NE 1258R 61 A60903660AP H V CAPACITOR 2 NE 1757CR NE 1757R 61 A60903780AP H V CAPACITOR 2 NE 2157R NE 2157CR 62 A6070 3280 INSULATION SHEET A 2 6...

Page 39: ... CAPACITOR BRACKET AC CORD MOTOR COVER BASE METAL ETC 106 XYD4 EE12F SCREW 11 4X12 FOR DIODE CAPACITOR BRACKET AC CORD MOTOR COVER BASE METAL ETC 106 XYD4 EE12F SCREW 11 4X12 FOR DIODE CAPACITOR BRACKET AC CORD MOTOR COVER BASE METAL ETC 106 XYD4 EE12F SCREW 11 4X12 FOR DIODE CAPACITOR BRACKET AC CORD MOTOR COVER BASE METAL ETC 106 XYD4 EE12F SCREW 11 4X12 FOR DIODE CAPACITOR BRACKET AC CORD MOTOR...

Page 40: ... A3018 3850 DOOR KEY A 1 D8 A3019 3850 DOOR KEY B 1 D9 ANE30218U0AP DOOR KEY SPRING 1 D10 ANE30562Q0AP HANDLE PIN 2 D10 ANE30562Q0AP HANDLE PIN 2 D11 A30703170GP HANDLE PEICE A 1 D12 ANE3081P60AP DOOR HINGE SPACER 1 D13 ANE30858U0AP DOOR C 1 D14 ANE30078U0AP HINGE 2 D14 ANE30078U0AP HINGE 2 D15 ANE31348U0AP HANDLE PEICE B 1 D16 XYEA4 C16TS SCREW 2 4X16 D16 XYEA4 C16TS SCREW 2 4X16 40 NE 1257R NE 1...

Page 41: ...UTCHEON SHEET 1 E2 A603M3310GP PC BOARD B U 1 E3 A64793310QP MEMBRANE SWITCH 1 E4 A6590 3280 FLAT CABLE 1 E5 ANE80018U0AP ESCUTCHEON A 1 E6 ANE80028U0AP ESCUTCHEON B 1 E7 ANE80068U0AP ESCUTCHEON D 1 E8 A800L3310QP ESCUTCHEON BASE 1 41 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258 ...

Page 42: ... A01023990AP PACKING CASE PAPER 1 NE 1258R P3 A01023970CP PACKING CASE PAPER 1 NE 1757CR P3 A01023970AP PACKING CASE PAPER 1 NE 1757R P3 A01023980AP PACKING CASE PAPER 1 NE 2157R P3 A01023980CP PACKING CASE PAPER 1 NE 2157CR P4 ANE01048U0AP UPPER FILLER 1 P5 ANE01058U0AP LOWER FILLER 1 P6 A01065200AP VINYL COVER 1 P7 ANE01072Q0AP DOOR SHEET 1 P8 A01083310GP TRAY PACKING 1 P9 ANE01268U0AP REIN FORC...

Page 43: ...0A3980CP LEAD WIRE HARNESS 1 NE 2157CR W2 A030H3960AP LEAD WIRE HARNESS 1 W3 A50966520UP FERRITE CORE 2 NE 1257CR NE 1757CR NE 2157CR W3 A50966520UP FERRITE CORE 2 NE 1257CR NE 1757CR NE 2157CR W3 A50966520UP FERRITE CORE 2 NE 1257CR NE 1757CR NE 2157CR W4 A606V3960AP PROTECTOR DIODE 1 W5 A606W3960AP PROTECTOR DIODE B 1 W6 A61393230BP INSULATION TUBE 1 W7 ERZC10DK471U VARISTOR 1 W8 ERZV10D112 VARI...

Page 44: ... POWER RELAY 1 G5B 1 E 18VDC RY3 4 5 AEG5J1EM18B POWER RELAY 5 NE 1757CR NE 1757R NE 2157R NE 2157CR G5J 1 TP M ER18 RY3 4 6 7 AEG5J1EM18B POWER RELAY 4 NE 1257CR NE 1257R NE 1258R G5J 1 TP M ER18 T100 ETP43KZN41EN L V TRANSFORMER 1 NE 1257CR NE 1257R NE 1258R T100 ETP43KZN61DN L V TRANSFORMER 1 NE 1757CR NE 1757R NE 2157R NE 2157CR ZD101 102 AEDZ13ES2T1 DIODE SI 2 30 REF NO 58 NOISE FILTER U Ref ...

Page 45: ... Ref No Part No Part Name Description Pcs Set Remarks CN250 AEEMHLIM21S CONNECTOR 1 21PIN DISP25 0 A64563080AP FLOURESCENT TUBE 1 FV443 ANE82848U2AP SPACER 1 45 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258 ...

Page 46: ...32 DIGITAL PROGRAMMER CIRCUIT SCHEMATIC DIAGRAM 46 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258R ...

Page 47: ...47 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258 ...

Page 48: ...0RRTA TRANSISTOR SI 400MW 2 Q4 UN4115 TA TRANSISTOR SI 300MW 1 UN4115 Q7 UN421F TA TRANSISTOR SI 1 UN421F Q8 9 11 SD1991AQSTA TRANSISTOR SI 3 2SD1991AQRS Q10 UN4111 TA TRANSISTOR SI 300MW 1 R10 11 ERDS2TJ151T CARBON FILM RESISTOR 2 150Ω Ω Ω Ω 1 4W 5 R12 17 21 22 23 34 38 46 47 61 62 65 ERDS2TJ103T CARBON FILM RESISTOR 12 10KΩ Ω Ω Ω 1 4W 5 R13 ERDS2TJ823T CARBON FILM RESISTOR 1 82KΩ Ω Ω Ω 1 4W 5 R1...

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