ne-1257r, ne
Contents
1. Ref Part No Part Name amp Description Pcs Remarks No Set 1 0006800 WARNING LABEL 1 NE 1257CR NE 1757CR NE 2157CR 1 A00064000AP WARNING LABEL 1 NE 1257R NE 1258R NE 1757R NE 2157R 2 A00333960AP LABEL 1 3 A0056 3500 HIGH VOLTAGE LABEL 1 4 ANE0072L20CP CAUTION LABEL L NE 1257CR NE 1757CR NE 2157CR 4 ANE0072L20AP CAUTION LABEL 1 NE 1257R NE 1258R NE 1757R NE 2157R 5 010 800 SHELF 1 6 0150110 CAUTION LABEL 1 NE 1257R NE 1258R NE 1757R NE 2157R 7 172800 CAUTION LABEL 1 8 ANE05108VOCP CAUTION LABEL 1 NE 1757CR NE 2157CR 8 05108 CAUTION LABEL 1 NE 1757R NE 2157R 9 A05243960AP LABEL 1 NE 1257R 9 A05243990AP LABEL 1 NE 1258R 9 A05243970AP LABEL 1 NE 1757R 9 A05243980AP LABEL 1 NE 2157R 9 A05243960CP LABEL 1 NE 1257CR 9 A05243970CP LABEL 1 NE 1757CR 9 A05243980CP LABEL 1 NE 2157CR 10 ANE0901000CD CUSHION RUBBER 1 11 0002000 CUSHION RUBBER 5 NE 1257R NE 1757R 11 ANE000Z000AD CUSHION RUBBER A 5 NE 1257R NE 1757R 12 ANE0911000MG CUSHION RUBBER B 1 13 0002000 CUSHION RUBBER 10 13 0002000 CUSHION RUBBER C 10 13 0002000 CUSHION RUBBER 10 13 0002000 CUSHION RUBBER C 10 13 0002000 CUSHION RUBBER 10 13 0002000 CUSHION RUBBER C 10 13 0002000 CUSHION RUBBER C 10 13 02. Ref Part No Part Name amp Description Pcs Remarks No Set 37 A8251 3180 SPACER 1 38 A3020 3850 DOOR HOOK A 1 39 A3136 3470 HOOK SPACER A 1 40 A3137 3850 HOOK SPACER B T 41 A3138 3470 HOOK SPACER C 1 42 A31863960CP DOOR PANEL 1 NE 1257CR 42 A31863960AP DOOR PANEL 1 NE 1257R 42 A31863990AP DOOR PANEL 1 NE 1258R 42 A31863970CP DOOR PANEL 1 NE 1757CR 42 A31863970AP DOOR PANEL 1 NE 1757R 42 A31863980AP DOOR PANEL 1 NE 2157R 42 A31863980CP DOOR PANEL 1 NE 2157CR 43 ANE32398U0AP SPRING 1 44 ANE32628U0AP SPRING 3 44 ANE32628U0AP SPRING 3 45 A400A3650AP MOTOR 2 NE 1257CR NE 1257R NE 1258R 50W 45 A400A3660AP MOTOR 2 NE 1757CR NE 1757R 54W 45 A400A3780AP MOTOR 2 NE 2157R NE 2157CR 51W 46 A400B 3280 AIR FILTER FLAME 1 47 A4024 3180 EXHAUST GUIDE A 1 48 4025800 AIR GUIDE 1 49 ANE40268U0AP AIR GUIDE B 1 50 A4091 3280 SCREW 1 FOR AIR FILTER FLAME 51 4103800 AIR GUIDE CUSHION B 1 52 ANE50328U0AP MAGNETRON BRACKET 2 52 5032800 MAGNETRON BRACKET 2 53 A50493650CP BARRIER 1 NE 1257CR NE 1757CR 53 A50493780CP FIRE BARRIER 1 NE 2157CR 54 A603L3960AP D P CIRCUIT U 1 NE 1257CR NE 1257R NE 1258R RTL W COMPONENT 54 A603L3970AP D P CIRCUIT U 1 NE 1757CR NE 1757R RTL W COMPONENT 54 A603L3980AP D P CIRCUIT U 1 NE 2157R NE 2157CR RTL W COMPONENT 55 ANE6030540AP INCANDESCENT LAMP 1 NE 1257CR NE 1257R NE 1258R 125V 20W
3. 6PIN AEEMMFO1F05R CONNECTOR 5PIN RED 00 04 CONNECTOR 4 AEEMO9FDZBTM CONNECTOR 9PIN AEEMHLEM21S CONNECTOR AEEMMF00703R CONNECTOR 3PIN RED EFOGC4194T4 RESONATOR 4 19MHZ AEDNERA1502 DIODE SI 1 0 MA700A DIODE SI 0 03A MA196 5 DIODE SI 0 1A AEIC38122283 IC M38122 AN6752 IC AN6752 AEICU2004GR2 IC A2004G AEICAT24C16N IC AT24C16N AEGHPHO124BS HEAT SINK NPHO124B S 2502012 TRANSISTOR SI 2502012 2SA720RRTA TRANSISTOR SI UNA4115 TA TRANSISTOR SI UN4115 UN421F TA TRANSISTOR SI UN421F SD1991AQSTA TRANSISTOR SI 2SD1991AQRS UN4111 TA TRANSISTOR SI 300MW ERDS2TJ151T CARBON FILM RESISTOR 150Q 1 4W 5 ERDS2TJ103T CARBON FILM RESISTOR 10KQ 1 4W 5 ERDS2TJ823T RESISTOR 82KQ 1 4W 5 ERDS2TJ390T RESISTOR 39Q 1 4W 5 ERDS2TJ152T RESISTOR 1 5KQ 1 4W 5 ERDS2TJ102T RESISTOR 1 0KQ 1 4W 5 ERDS2TJ220T FILM RESISTOR 220 1 4W 5 ERDS2FJ103T FILM RESISTOR 10KQ 1 4W 5 ERDS2TJ681T FILM RESISTOR 6800 1 4W 5 ERDS2TJ333T FILM RESISTOR 33KQ 1 4W 5 ERDS2TJ332T FILM RESISTOR 3 3KQ 1 4W 5 ERDS2TJ4
4. ANE9027510RN CORD BUSHING ANE9035P90AP CORD BRACKET ANE90828U0AP CLIP BLACK ANE91438U0AP CLIP GLAY NE 1257CR NE 1257R NE 1258R ANE91448U0AP BRACKET ANE91628U0AP CLIP B ANE91658V0AP CLIP ANE91658V0AP CLIP XTC4 10BC SCREW 4X10 FOR CABINET BODY XTC4 10BC SCREW 4X10 FOR CABINET BODY XTC4 10BC SCREW 4X10 FOR CABINET BODY XTC4 10FC SCREW 4X10 FORLAMP COVER XTC4 12BK SCREW BLACK 4X12 FOR BASE XTC4 12BK SCREW BLACK 4X12 FOR BASE XTEANE5 10B SCREW 5X10 FOR H V TRANSFORMER XTT4 8E SCREW 4X8 FOR BACK PANEL COVER XTWANE3 8EX SCREW 3X8 FOR TEMP SENSOR XTW3 8B SCREW 3X8 FOR FOOT XWC4BPN WASHER FOR BACK PANEL COVER LAMP COVER XWC4BPN WASHER FOR BACK PANEL COVER LAMP COVER XYD4 EE12F SCREW Piy welelyelelealy plelelelealelelelelelelelelelelelelelelelelelelelelele 4X12 FOR DIODE CAPACITOR BRACKET COVER BASE METAL ETC XYD4 EE12F SCREW 4X12 FOR DIODE CAPACITOR BRACKET COVER BASE METAL ETC XYD4 EE12F SCREW 4X12 FOR DIODE CAPACITOR BRACKET COVER BASE METAL ETC XYD4 EE12F SCREW 4X12 FOR DIODE CAPACITOR BRACKET COVER BASE METAL ETC XYD4 EE12F SCREW 4X12 FOR DIODE CAPACITOR BRACKET COVER BASE METAL ETC XYD4 EE12F SCREW 4X12 FOR DIODE CAPACITOR BRACKET
5. FAN MOTOR LOWER HIGH VOLTAGE 2304 TRANSFORMER VOLTAGE SELECTOR SOCKET i HIGH VOLTAGE CAPACITOR UPPER DIODE LOWER POWER SUPPLY CIRCUIT BOARD TRANSFORMER CN100 CN101 CN105 CN104 p KEYBOARD f WHITE PLUG 208V SAFETY SWITCH A SW8 SECONDARY DIGITAL PROGRAMMER CIRCUIT BOARD TEMP SENSOR OVEN GROUNDING THERMAL CUTOUT SHORT SWITCH DISPLAY GROUND UPPER MAGNETRON LOWER CN250 CIRCUIT CHASSIS GROUND THERMAL CUTOUT SAFETY SWITCH A Nutt BOARD LOWER MAGNETRON SECONDARY VARISTOR THERMAL CUTOUT RELAY OVEN SAFETY SWITCH B FAN MOTOR PROG DIODE 8 8 UPPER PROTECTER DIODE SHORT SWITCH ANTENNA MOTOR 123 mnm 0000 0000 O UPPER FUSE SAFETY SWITCH B HIGH VOLTAGE DISPLAY LOWER CAPACITOR OVEN LAMP 240V 20W 15 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258R 9 SCHEMATIC DIAGRAM NE 2157CR FUSE 18A NOTE Door is closed Unit is not operated AC208V 230V 60Hz ON D FUSE 18A 0 9mH MAGNETRON UPPER HIGH VOLTAGE TRANSFORMER HIGH VOLTAGE CAPACITOR LOWER DIODE UPPER TO 1 CN102 1 MAGNETRON LOWER VOLTAGE SELECTOR SOCKET TRANSFORMER NOISE FILTER CIRCUIT B
6. D19 2 MA196 D20 2 MA196 R50 1K ANY R51 1K n R52 100K i R53 100K amp G R54 R55 100K 100K CN250 12 1ECN17 215 CNB e 1 21 17_215 Q TP2 1 3 QTP4 5 6 91 QTP10 17 11 2 pes 7 14 15 2620629202026 CO G2 2C 525226969 XX Xo lt lt R61 Q 10K P33 2 P34 Reo CNS 10 20 R35 C28 R36 Lv ANA 82 M 108 T X3 e LED Deme 4 un m HH U in n 1 DISP250 FV443GN 47 MA196 5 396 L NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258R 33 DIGITAL PROGRAMMER CIRCUIT PARTS LIST Part No Part Name amp Description Remarks EFBRL37C20 BUZZER 3 7KHZ 1 471 ELECTROLYTIC CAPACITOR AL 470MF 50V 1 221 ELECTROLYTIC CAPACITOR AL 220MF 50V AECF50F104Z CERAMIC CAPACITOR 0 1MF 50V ECEA1CKA100B ELECTROLYTIC CAPACITOR AL 10MF 16V 1 1032 5 CERAMIC CAPACITOR 0 01MF 25V 2 2 ELECTROLYTIC CAPACITOR AL 2 2MF 50V 1 101 5 CERAMIC CAPACITOR 0 0001MF 50V AEEMMFO1F05W CONNECTOR 5PIN 6
7. connector housing 21 OR Y w SYMBOL COLOUR B BLACK RED ORANGE GR GRAY NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258R 15 WIRING DIAGRAM NE 2157CR NOTE When replacing check the lead wire color as shown HIGH VOLTAGE TRANSFORMER UPPER SAFETY SWITCH B LOWER Magnetron UPPER Magnetron LOWER SAFETY SWITCH B UPPER LOWER HIGH VOLTAGE CAPACITOR UPPER HIGH VOLTAGE TRANSFOR LOWER NOTE When replacing check the lead wire color as shown Colors shown by indicate colors of lead wire connector housing w w on V SYMBOL COLOUR B BLACK R RED OR ORANGE GR GRAY BR BROWN Y YELLOW BL BLUE WHITE PK PINK 22 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258 16 DESCRIPTION OF OPERATING SEQUENCE Variable power cooking control The coil of power relay A and B are energized intermittently by the digital programmer circuit when the oven is set to MEDIUM or DEFROST power position The digital programmer circuit controls the ON OFF time of the power relay A and B contacts in order to vary the output power of the micro
8. 2W 5 AEBG5B18P 1 POWER RELAY NG5B 1 ER18 5 1 18 POWER RELAY ANG5B 1 E 18VDC AEG5J1EM18B POWER RELAY A NE 1757CR NE 1757R NE 2157R NE 2157CR G5J 1 TP M ER18 AEG5J1EM18B POWER RELAY A NE 1257CR NE 1257R NE 1258R G5J 1 TP M ER18 ETP43KZN41EN L V TRANSFORMER NE 1257CR NE 1257R NE 1258R ETP43KZN61DN L V TRANSFORMER NE 1757CR NE 1757R NE 2157R NE 2157CR AEDZ13ES2T1 Part No DIODE SI Part Name amp Description Remarks ECKMNA222ME CERAMIC CAPACITOR A NE 1257CR NE 1757CR NE 2157CR 0 0022MF 250V ECQU2A224MNA POLYESTER CAPACITOR NE 1257CR NE 1757CR 0 22MF 250V ERZV10D911E1 VARISTOR NE 1257CR NE 1757CR ERZV10D182E2 VARISTOR NE 1257CR NE 1757CR ERZV10D621CS VARISTOR NE 1257CR NE 1757CR A6116 3280 TERMINAL BOARD NE 1257CR NE 1757CR A62316010BP FUSE HOLDER NE 1757CR A62316010BP FUSE HOLDER NE 1257CR A621A 1810 FILTER COIL 44 NE 1257CR NE 1757CR NE 1257CR NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258 31 REF NO E2 P C BOARD U Part No Part Name amp Description Remarks AEEMHLIM21S CONNECTOR 21PIN 64563080 FLOURESCENT TUBE 443 ANE82848U2AP SPACER 45 32 DIGITAL PROGRAMMER CIRCUIT SCHEMATIC DIAGRAM A603Y3650AP T100 1 CN100 CN1 CN102 ECN20_7W04
9. COVER BASE METAL ETC XYD4 EE12F SCREW 4X12 FOR DIODE CAPACITOR BRACKET COVER BASE METAL ETC XYD4 EE12F SCREW 4X12 FOR DIODE CAPACITOR BRACKET COVER BASE METAL ETC XYD4 EE12F SCREW 4X12 FOR DIODE CAPACITOR BRACKET COVER BASE METAL ETC XYD4 EE12F SCREW 4X12 FOR DIODE CAPACITOR BRACKET COVER BASE METAL ETC XYD4 EE12F SCREW 4X12 FOR DIODE CAPACITOR BRACKET COVER BASE METAL ETC XYD4 EE12F SCREW 4X12 FOR DIODE CAPACITOR BRACKET COVER BASE METAL ETC XYEANE5 C16T SCREW 5X16 FOR MAGNETRON XYEANE5 C16T SCREW 5X16 FOR MAGNETRON XYEANE5 C16T SCREW 5X16 FOR MAGNETRON XYEANE5 C16T SCREW 5X16 FOR MAGNETRON XYEA4 C16TS SCREW 2M210 M1F1 MAGNETRON A NE 1257R NE 1258R NE 1757R 2M210 M1G MAGNETRON A NE 1257CR NE 1757CR 2M244 M1F1 MAGNETRON ANE 2157R NE 2157CR 2M244 M1G MAGNETRON NE 2157R A601L5150AP TEMP SENSOR A ANE0245X00AP DHHS LABEL NE 1257R NE 1258R NE 1757R NE 2157R A04115020CQ CSA LABEL 39 NE 1257CR NE 1757CR NE 2157CR NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258R 25 DOOR ASSEMBLY 8 396 APH Part No Part Name amp Description Remarks A3145 3500 DOOR S
10. STRIPPER MOTOR LOWER HIGH VOLTAGE CAPACITOR UPPER DIODE I LOWER VOLTAGE SELECTOR SOCKET LOW VOLTAGE TRANSFORMER POWER SUPPLY CIRCUIT BOARD 8 CN104 L CN1027 WHITE PLUG 4 KEYBOARD y SAFETY SWITCH A SW8 SECONDARY DIGITAL PROGRAMMER CIRCUIT BOARD TEMP SENSOR CN250 DISPLAY CIRCUIT 1t ft BOARD 98 88 PROG 88 123 mnm 0000 0000 O DISPLAY OVEN GROUNDING GROUND CHASSIS GROUND VARISTOR DIODE PROTECTER DIODE FUSE THERMAL CUTOUT UPPER MAGNETRON THERMAL CUTOUT LOWER MAGNETRON THERMAL CUTOUT OVEN SAFETY SWITCH B UPPER SHORT SWITCH UPPER SAFETY SWITCH B LOWER SHORT SWITCH LOWER SAFETY SWITCH A SECONDARY RELAY FAN MOTOR ANTENNA MOTOR HIGH VOLTAGE CAPACITOR OVEN LAMP 240V 20W 14 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258 8 SCHEMATIC DIAGRAM 2157 NOTE Door is closed P MAGNETRON Unit is not operated UPPER r HIGH VOLTAGE FUSE 18A TRANSFORMER FUSE Ti AT o 18 230 J CN103 208V AC208V 230V Eken ERE 60Hz oof joo HIGH VOLTAGE CAPACITOR LOWER LOWER LOWER DIODE lt eet UPPER Y Fg CN102 1 MAGNETRON LOWER CN106 0000009000
11. assignment of the respective pads on the key board is as shown in digital programmer circuit 19 6 Protector diode 1 lsolate the protector diode assembly from the circuit by disconnecting its leads 2 With the ohmmeter set on the highest resistance scale measure the resistance across the protector diode terminals Reverse the meter leads and again observe the resistance reading A normal protector diode s resistance will be infinite in both directions It is faulty if it shows continuity in one or both directions 19 7 Temp sensor Thermal protector A temp sensor is mounted on exhaust guide Its purpose is to automatically shut off the oven in case the cavity overheats for any reason The thermal 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 30 50 F 86 F NOTE OHMMETER SHOULD HAVE A MINIMUM 6 VOLT BATTERY FORWARD REVERSE SEVERAL HANDRED KQ 0 FORWARD REVERSE 31 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258R 20 MEASUREMENTS AND ADJUSTMENTS WARNING For continued protection against excess
12. each terminal and chassis should be infinite 19 3 Magnetron Continuity checks can only indicate an open filament or a shorted magnetron To diagnose for an open filament or shorted magnetron 1 lsolate magnetron from the 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 FILAMENT 00 SECONDARY WINDING TERMINALS 800 1200 PRIMARY WINDING TERMINALS 04 038M 30 HIGHEST OHM scare HIGH VOLTAGE CAPACITOR HIGHEST OHM SCALE 04 032M ANTENNA COOLING FIN 7 MAGNETRON CASE HIGHEST OHM SCALE 04 031M 19 4 Diode 1 Isolate the diode from 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 diode s resistance will be infinite in one direction and several hundred kQ in the other direction 19 5 Membrane key board Membrane switch assembly Check continuity between switch terminals by tapping an appropriate pad on the key board The contacts
13. in this manual have been used immediately notify PHCC PSC or PCI 21 1 Equipment Note before measuring 21 3 At least once a year have the 1 Do not exceed meter full scale deflection Leakage monitor radiation monitor checked for should initially be set to the highest scale calibration by its 2 To prevent false readings the test probe should be held by manufacturer the grip portion of the handle only and moved along the shaded area shown in Figure no faster than 1 inch sec 2 5 cm sec WARNING 3 Leakage with the outer panel removed less than 5 AVOID CONTACTING ANY HIGH VOLTAGE PARTS mW cm PROBE 4 Leakage for a fully assembled oven with door normally SPACER closed less than 2 mW cm 1 mW cm for Canada MAGNETRON UPPER 5 Leakage for a fully assembled oven Before the latch switch primary is interrupted while pulling the door less than 2 mW cm 1 Pour 275 15cc 90zs 1 20z of 20 5 C 68 9 F water in a beaker which has graduations to 600cc and place in the center of the oven 2 Set the radiation monitor to 2450MHz and use it following the manufacture s recommended test procedure to assure correct results 3 When measuring the leakage always use the 2 inch 5 cm spacer supplied with the probe 4 Tap the start pad or set the timer and with the magnetron MAGNETRON LOWER oscillating measure the leakage by holding the probe perpendicular to the surface being
14. is appeared when exhaust temperature Wish sone exceeds 120 exceeds above 120 C beep sounds Memory failure 1 Digital programmer circuit failure No voltage supply to 1 Relay failure RY 3 It is appeared when cooking completed high voltage 2 10A fuse open transformer upper 3 Digital programmer circuit failure No voltage supply 1 Relay failure RY 4 It is appeared when cooking completed high voltage 2 10A fuse open transformer lower 3 Digital programmer circuit failure F86 Shorted contacts of 1 Relay failure RY 3 It is appeared when failure occured RY 3 2 Digital programmer circuit failure F87 Shorted contacts of 1 Relay failure RY 4 It is appeared when failure occured RY 4 2 Digital programmer circuit failure 35 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258R 23 EXPLODED VIEW AND PARTS LIST 8 396 36 24 PARTS LIST NOTE When ordering replacement part s please use part number s shown in this parts list Important safety notice NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258 Components identified A by mark have special characteristics important for safety When replacing any of these components use only manufacture s specified parts
15. measured 08 176M 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 WARNING Avoid contacting any high voltage parts 2 Measurements with a fully assembled oven After all components including outer panel are fully assembled measure for radiation leakage around the door 33 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258R NN SN 22222222222722222222227 Z l LLL y Sy WS 08 177 MOVE PROBE ALONG SHADED AREA 7777 AROUND EXHAUST OPENINGS as shown AND AROUND AIR INLET OPENING 34 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258 22 TROUBLESHOOTING GUIDE CAUTION Check grounding before checking for trouble Be careful of the high voltage circuit Discharge high voltage capacitor 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 To do otherwise may result in a false reading or damage to your meter When disconnecting a plastic connector from a ter
16. parts must be replaced always remove the power plug from the outlet and discharge the high voltage capacitor WARNING When the 25 18 Amp fuse is blown due to the operation of the Interlock Monitor Switch you must replace the Secondary amp Primary Interlock Switches the Monitor Switch Short switch Power Relay and the 25 18 Amp 250V fuse 17 5 Confirm after repair 1 After repair or replacement of parts make sure that the screws of the oven etc are neither loose nor missing Microwave might leak if screws are not properly tightened 2 Make sure that 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 CAUTION MICROWAVE RADIATION Personnel should not be exposed to the microwave energy which may radiate from the magnetron or other microwave generating device if it is improperly used or connected All input and output microwave connections waveguides flanges and gaskets must be secure Never operate the device without a microwave energy absorbing load attached Never look into an open waveguide or antenna while the device is energized CAUTION High voltage parts may become exposed when outer cabinet is
17. removed 25 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258R 18 DISASSEMBLY AND PARTS REPLACEMENT PROCEDURE CAUTION Servicemen should remove their watches whenever working close to or replacing the magnetron 18 1 Replacement of magnetrons Upper and Lower Upper magnetron 1 Discharge electric charge remaining on the high voltage capacitors 2 Remove the entire rear panel by removing screws as shown 3 Disconnect all lead wires from magnetron and thermal cutout 4 Remove the 4 screws holding magnetron 5 Remove 2 screws holding thermal cutout 08 028M 6 Remove the mounting bracket from magnetron and install it on the new magnetron Lower magnetron 1 Discharge electric charge remaining 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 590000905 6 Remove 2 screws holding thermal cutout 7 Remove the mounting bracket from magnetron and install it on the new magnetron NOTE To prevent microwave leakage tighten mounting screws properly making sure there is no gap bet
18. switch safety switches A amp B and check the continuity of t monitor 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 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 32 water using the thermometer and record the beaker s temperature recorded as T1 2 Place the beaker on the center of ceramic shelf 3 Set the one to High power and heat it for exactly one minute 4 Stir the water again and read the temperature of the beaker recorded as T2 The normal temperature rise T2 T1 at High power output for each model is as shown in table DOOR HOOK ASSEMBLY DOOR KEY A SAFETY SWITCH A SECONDARY V 16G 3C26 SHORT SWITCH V 16G 2C25 SAFETY SWITCH B PRIMARY V 15G 3C26 08 176M Please confirm that the gap between the switch housing and Switch actuator levers is no more than 0 5mm when the door is closed TABLE 12 1 min test RATED OUTPUT TEMPERATURE RISE 1200
19. the oven P8 P11 S 396 Part No Part Name amp Description Remarks NE 1257CR NE 1757CR NE 2157CR NE 1257R NE 1258R NE 1757R NE 2157R A00033960CP A00033960AP A04203960AP A01023960CP A01023960AP A01023990AP A01023970CP A01023970AP A01023980AP A01023980CP INSTRUCTION BOOK INSTRUCTION BOOK OPERATING GUIDE PACKING CASE PAPER PACKING CASE PAPER PACKING CASE PAPER PACKING CASE PAPER PACKING CASE PAPER PACKING CASE PAPER PACKING CASE PAPER NE 1257CR NE 1257R NE 1258R NE 1757CR NE 1757R NE 2157R NE 2157CR 0104800 UPPER FILLER 0105800 LOWER FILLER A01065200AP VINYL COVER 0107200 DOOR SHEET A01083310GP TRAY PACKING 0126800 REIN FORCE MATERIAL A01453230BP DOOR SHEET B A1134 3280 FOOT BRACKET 42 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258 28 WIRING MATERIAL H V CAPACITOR MAGNETRON W3 Back Front x Upper W8 To chassis H V TRANSFORMER H V TRANSFORMER MAGNETRON Lower 5 396 Part No Part Name amp Description Remarks A030A3960CP LEAD WIRE HARNESS A030A3960AP LEAD WIRE HARNESS A030A3970CP LEAD WIRE HARNESS A030A3970AP LEAD WIRE HARNESS A030A3980AP LEAD WIRE HARNESS A
20. 002000 CUSHION RUBBER 10 13 0002000 CUSHION RUBBER 10 14 0002000 CUSHION RUBBER 4 NE 1257CR NE 1757CR NE 2157CR 14 0002000 CUSHION RUBBER C 5 NE 1258R NE 2157R 15 0002000 CUSHION RUBBER 1 16 ANE0962000AP CUSHION RUBBER D 1 17 ANE0962000AV CUSHION RUBBER D 1 18 A100A 3280 BASE 1 19 1000 3280 BACK PANEL 1 20 A1007 3280 FOOT 4 20 A1007 3280 FOOT 4 20 A1007 3280 FOOT 4 20 A1007 3280 FOOT 4 21 A1008 3280 RUBBER FOOT 4 21 A1008 3280 RUBBER FOOT 4 21 A1008 3280 RUBBER FOOT 4 21 A1008 3280 RUBBER FOOT 4 22 1009800 CABINET BODY 1 23 ANE10268U0AP LAMP COVER 1 24 ANE10288U0AP ANTENNA MOTOR COVER 1 25 ANE10498U0AP CUSHION RUBBER 1 26 NE11268U0AP BASE BRACKET 1 27 1062 800 CUSHION RUBBER 2 27 1062 800 CUSHION RUBBER 2 28 ANE11408A0AG STOPPER 1 29 ANE11548U0AP BACK PANEL COVER 1 30 ANE11668U0AP BASE METAL 1 31 ANE11748U0AP SPACER 32 A200A 3280 OVEN 1 A 33 A2011 3470 CEILING PLATE 1 A 34 A202K 3850 ANTENNA 1 UPPER 35 A202V3310GP ANTENNA B 1 LOWER NE 1257R NE 1257CR NE 1757R NE 1757CR NE 1258R 35 A202V 3850 ANTENNA B 1 NE 2157R NE 2157CR LOWER 36 2120800 SPACER 1 37 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258R
21. 030A3980CP LEAD WIRE HARNESS A030H3960AP LEAD WIRE HARNESS A50966520UP CORE A50966520UP CORE A50966520UP CORE A606V3960AP DIODE A606W3960AP DIODE B A61393230BP INSULATION TUBE ERZC10DK471U VARISTOR ERZV10D112 VARISTOR ANE0352 3280 LEAD WIRE NE 1257CR NE 1257R NE 1258R NE 1757CR NE 1757R NE 2157R NE 2157CR NE 2157CR NE 1257CR NE 1757CR NE 2157CR NE 1257CR NE 1757CR NE 2157CR NE 1257CR NE 1757CR NE 2157CR B s sis s r FOR ANTENNA MOTOR 43 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258R 29 REF NO 89 L V TRANSFORMER U Part No Part Name amp Description ANE61158U0AP POWER RELAYBRACKET ANE65448U0AP SPACER A ANE65458U0AP SPACER B A6338 3280 INSULATION SHEET B 255 SCREW AEEMMFO1F05W CONNECTOR AEEMMF03F06W CONNECTOR AEEMMD04907W CONNECTOR AEEMMD04907R CONNECTOR AEEMMF00703W CONNECTOR AEEMMF00703R CONNECTOR AEEMMD24910W CONNECTOR MA196 TA5 DIODE SI 3X25 5PIN 6PIN 7PIN 7PIN RED 3PIN 3PIN RED 10PIN NE 1257CR NE 1257R NE 1258R 196 5 DIODE SI NE 1757CR NE 1757R NE 2157R NE 1257CR AEDNERA1506 DIODE SI AEICP25011HL IC ERDS1TJ434T CARBON FILM RESISTOR 430K 1
22. 55 A60304080BP INCANDESCENT LAMP 1 NE 1757CR NE 1757R NE 2157R NE 2157CR 240V 20W 56 ANE60408U0AP OVEN LAMP SHEET 2 NE 1257CR NE 1257R NE 1258R NE 1757CR NE 1757R 56 A60403780AP OVEN LAMP SHEET 2 NE 2157R NE 2157CR 57 ANE61458U0AP THERMAL CUTOUT 2 A 57 ANE61458U0AP THERMAL CUTOUT 2 A 5T ANE61458U0AP THERMAL CUTOUT 2 A 58 A605S3650CP BOARD H U 1 NE 1257CR 58 A605S3660CP PC BOARD U 1 NE 1757CR NE 2157CR 59 ANE60708U0BP INSULATION SHEET T 60 A60713310BP INSULATION SHEET B 1 61 A60903650AP H V CAPACITOR 2 A NE 1257CR NE 1257R NE 1258R 61 A60903660AP 2 A NE 1757CR NE 1757R 61 A60903780AP H V CAPACITOR 2 A NE 2157R NE 2157CR 62 6070 3280 INSULATION SHEET 2 63 ANE6142 F60 MICROSWITCH 2 V 15G 3C26 PRIMARY LATCH SWITCH 64 ANE61424L0AG MICROSWITCH T V 16G 3C26 SECONDARY LATCH SWITCH 65 A6144 3280 ANTENNA MOTOR 1 NE 1257CR NE 1257R NE 1258R NE 1757CR NE 1757R 2 5W 65 A61443030GP MOTOR 1 NE 2157R NE 2157CR 2 5W 68 A61443660AP MOTOR 1 NE 1757CR NE 1757R NE 2157R NE 2157CR 2 5W 68 A61446030AP MOTOR 1 NE 1257CR NE 1257R NE 1258R 2 5W 69 A65943030GP MOTOR COVER 1 70 ANE61458U0AP THERMAL CUTOUT T A NE 1257R NE 1757R 71 ANE61454L0AG THERMAL CUTOUT 1 A NE 1257CR NE 1757CR 71 A61454050AP THERMAL CUTOUT 1 A NE 2157R NE 2157CR 72 A61524210AA 5 1 73 6170 3280 INSULATION SHEET 1 NE 1257CR NE 1757CR NE 2157CR 74 ANE61784L0A
23. 72T FILM RESISTOR 4 7KQ 1 4W 5 ERDS2TJ184T FILM RESISTOR 180KQ 1 4W 5 ERDS2TJ104T FILM RESISTOR 100KQ 1 4W 5 ERDS2TJ470T FILM RESISTOR 47Q 1 4W 5 AEDZ4R7ES3T1 DIODE SI AEDZ5R6ES2T1 DIODE SI AEDZ24ES3T1 DIODE SI 48
24. 9H ETPA3K 391 ECN20 5 ECN20 5 pais FS 9 6 e R14 392 ANY R13 82K Q1 2502012 E D12 Y 487004 9 10K 104 104 R16 15K 025 R17 C12 C13 TOnF16V 95 CN106 ECN20 10W249H CN RY1 LAMP G5B 12V D100 71 196 1 CN101 CN2 20 6 1ECN20 6 PER Dh R18 1K CUSTOM IC 162 ANGTSPIONIGGTTAN POWER RERAY CONTROL 0106 10100 47Q 47Q ERA1506 PS2501 UPPER ea UN as e 1 he 0 71 1502 1502 28D1991A CIRCUIT 18 2nF50V 13 c 1 2 3 Lore 5 CIRCUIT R22 10K X 9 D14 MA196 5 CN3 ECN20_5R 6 D15 MA196 7 015 MA196 Kr Ica UPA2004GR 46 D17 MA196 K R28 JPR5MM 5 396 APH D F CNS ECN20_6R 21 TP20 TPT TP18 AT24C TEN Los IAN Lr 50 OON R42 R41 3 3K R43 E 28D1991A 47K 4 bX R44 Ins C29 6802 R46 10K 25 1991 R48 1K AN NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258 S 365AP 366AP ETP43KZN41EN ETP43KZN61DN NC G5J 18V NC R49 1K
25. CREEN A ANE31468U0AP DOOR SCREEN B ANE30038U0AP DOOR FRAME U ANE301A8U0AP DOOR A A301H 3850 DOOR KEY LEVER B 010800 DOOR E U A3018 3850 DOOR KEY A A3019 3850 DOOR KEY B ANE30218U0AP DOOR KEY SPRING 056200 HANDLE PIN 056200 HANDLE PIN A30703170GP HANDLE PEICE A ANE3081P60AP DOOR HINGE SPACER ANE30858U0AP DOOR C 007800 HINGE 007800 HINGE ANE31348U0AP HANDLE PEICE B XYEA4 C16TS SCREW XYEA4 C16TS SCREW 4 16 4 16 H H o H H e 40 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258 26 ESCUTCHEON BASE ASSEMBLY E7 56 396 APH Part No Part Name amp Description Remarks A8337 3280 ESCUTCHEON SHEET A603M3310GP PC BOARD 0 A64793310QP SWITCH A6590 3280 FLAT CABLE ANE80018U0AP ESCUTCHEON A ANE80028U0AP ESCUTCHEON B 8006800 ESCUTCHEON D A800L3310QP ESCUTCHEON BASE 41 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258R 27 PACKING AND ACCESSORIES OVEN WALL TRAY PACKING P9 Cut into three parts when packing VEILING PLATE INSTRUCTION N Vaaa N N 7227 P1 0 SIDE VIEW Put in
26. ER LOWER THERMAL CUTOUT UPPER MAGNETRON THERMAL CUTOUT LOWER MAGNETRON THERMAL CUTOUT OVEN SAFETY SWITCH B UPPER SHORT SWITCH UPPER SAFETY SWITCH B LOWER HIGH VOLTAGE CAPACITOR UPPER DIODE UPPER MAGNETRON LOWER HIGH VOLTAGE CAPACITOR LOWER DIODE LOWER SHORT SWITCH LOWER SAFETY SWITCH A SECONDARY RELAY FAN MOTOR ANTENNA MOTOR HIGH VOLTAGE CAPACITOR OVEN LAMP 125V 20W 1257CR 1757 6 SCHEMATIC DIAGRAM 1757 THERMAL CUTOUT NOTE Door is closed Unit is not operated 1757CR 2157 MAGNETRON UPPER HIGH VOLTAGE TRANSFORMER AC208 230V 60Hz VARISTOR OVEN LAMP FAN MOTOR RELAY 2 STIRRER MOTOR UPPER FAN MOTOR LOWER TCH MARY i LATCH SWITCH PRIMARY STIRRER VOLTAGE SELECTOR SOCKET F KEYBOARD y MOTOR LOWER SW7 SHORT SWITCH LOWER FAN MOTOR LOWER TRANSFORMER LOW VOLTAGE SAFETY SWITCH A 250 DISPLAY CIRCUIT F ft BOARD 58 DD 58 0000 0000 0000 Cj DISPLAY DIGITAL PROGRAMMER CIRCUIT BOARD SW8 SECONDARY TEMP SENSOR OVEN 13 GROUNDING GROUND CHASSIS GROU
27. G MICRO SWITCH 2 V 16G 2C25 SHORT SWITCH 75 ANE61888U0AP CAPACITOR BRACKET 2 76 A62023960AP DIODE SI 2 A NE 1257CR NE 1257R NE 1258R NE 1757CR NE 1757R 76 A62023880AP DIODE SI 2 A NE 2157R NE 2157CR 77 621 3650 H V TRANSFORMER 2 NE 1257CR NE 1257R NE 1258R 77 A621B3660AP V TRANSFORMER 2 NE 1757CR NE 1757R 77 A621B3780AP H V TRANSFORMER 2 NE 2157R NE 2157CR 78 ANE62298U0AP MOUNTING BRACKET T 79 ANE6230P90AP FUSE 1 A NE 1257CR NE 1257R NE 1258R 25 79 A62303970AP FUSE 2 A NE 1757CR NE 1757R NE 2157R NE 2157CR 18 80 A62314000AP FUSE HOLDER 1 NE 1257R NE 1258R 80 A62314000AP FUSE HOLDER 2 NE 1757R NE 2157R 81 ANE6238X20AP SPACER T 82 6408600 WASHER 1 38 Part No Part Name amp Description Remarks A6408 3280 WASHER ANE65448U0AP SPACER A A6585 3280 P C B HOLDER ANE66038U0AP OVEN LAMP BRACKET ANE66268U0AP THERMAL CUTOUT MOUNT NE 1257R NE 1258R NE 1757R A6688 3180 P C B COVER A692M3650AP L V TRANSFORMER U NE 1257CR NE 1257R NE 1258R A692M3660AP L V TRANSFORMER U NE 1757CR NE 1757R NE 2157R NE 2157CR B900C3650CP AC CORD W PLUG A NE 1257CR B900C3650AP AC CORD W PLUG A NE 1257R NE 1258R B900C3660CP AC CORD W PLUG NE 1757CR B900C3660AP AC CORD W PLUG NE 1757R B900C3780AP ACCORD W PLUG NE 2157R B900C3780CP AC CORD W PLUG 2157
28. IT minimum 20 amps b The microwave ovens are built to operate on 2 different voltages 230 V or 208 V Be sure that the 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 slower heating of the food Panasonic is NOT responsible for damage resulting from the use of 10 the oven with other than specified voltage NE 2157 208 V 230 V NEMA T Grounded 6 20P 7 Outlet NEMA 6 20R Power Source Voltage Selection The microwave oven Models NE 1757 amp NE 2157 are factory set for 208 V operation For 230 V operation the following selection MUST be made Step 1 Unscrew the voltage selection panel cover which is located on the back of the oven Do not remove any other parts from the oven Step 2 Remove the while connector and plug the black connector into the socket Step 3 Store the unused white connector in the rectangular opening Step 4 Reattach the voltage adjustment panel cover to the cabinet For 230 V Use black connector plug For 208 V Use white connector plug To go from 230 V to 208 V circuit follow steps 1 4 above except at step 2 plug the white connec
29. ND VARISTOR DIODE PROTECTER DIODE FUSE HIGH VOLTAGE CAPACITOR LOWER DIODE UPPER TO CN102 1 MAGNETRON LOWER HIGH VOLTAGE CAPACITOR UPPER DIODE LOWER THERMAL CUTOUT UPPER MAGNETRON THERMAL CUTOUT LOWER MAGNETRON THERMAL CUTOUT OVEN SAFETY SWITCH B UPPER SHORT SWITCH UPPER SAFETY SWITCH B LOWER CN1027 WHITE PLUG SHORT SWITCH LOWER SAFETY SWITCH A SECONDARY RELAY FAN MOTOR ANTENNA MOTOR HIGH VOLTAGE CAPACITOR OVEN LAMP 240V 20W NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258R 7 SCHEMATIC DIAGRAM NE 1757CR POWER NOTE Door is closed r NOISE FILTER UNIT THERMAL CUTOUT RELAY POWER UPPER RELAY RY3 RYG THERMAL CUTOUT UPPER MAGNETRON MAGNETRON UPPER _ _ PRIMARY UPPER Unit is not operated o 9mH OVEN 0 O n HIGH VOLTAGE STIRRER TRANSFORMER UPPER 208 HIGH VOLTAGE BLACK CAPACITOR PLUG LOWER B DIODE UPPER AC208 230V 60Hz SHORT USWITCH 1 UPPER VARISTOR VARISTOR OPTION TO CN102 1 POWER RELAY POWER UPPER RELAY PRIMARY UPPER THERMAL CUTOUT LOWER MAGNETRON MAGNETRON LOWER FAN MOTOR UPPER OVEN LAMP 125V 20W 1 LATCH 1 SWITCHB 1 UPPER
30. OARD CN100 CN101 CN105 POWER SUPPLY CIRCUIT BOARD CN104 HIGH VOLTAGE CAPACITOR UPPER DIODE LOWER 4 KEYBOARD Z DISPLAY CIRCUIT BOARD 88 80 58 123 mnm 0000 0000 O DISPLAY DIGITAL PROGRAMMER CIRCUIT BOARD SAFETY SWITCH A SW8 SECONDARY TEMP SENSOR OVEN GROUNDING GROUND CHASSIS GROUND VARISTOR DIODE PROTECTER DIODE FUSE 16 THERMAL CUTOUT UPPER MAGNETRON THERMAL CUTOUT LOWER MAGNETRON THERMAL CUTOUT OVEN SAFETY SWITCH B UPPER SHORT SWITCH UPPER SAFETY SWITCH B LOWER CN102 7 WHITE PLUG 208V SHORT SWITCH LOWER SAFETY SWITCH A SECONDARY RELAY FAN MOTOR ANTENNA MOTOR HIGH VOLTAGE CAPACITOR OVEN LAMP 240V 20W 10 WIRING DIAGRAM NE 1257R NE 1258R NOTE When replacing check the lead wire color as shown HIGH VOLTAGE TRANSFORMER UPPER SAFETY SWITCH B LOWER Magnetron UPPER Magnetron LOWER SAFETY SWITCH B UPPER NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258 HIGH VOLTAGE TRANSFOR LOWER LOWER HIGH VOLTAGE CAPACITOR UPPER NOTE When replacing check the lead wire color as shown Colors shown by indicate colors of lead wi
31. ORDER NO 0009238 1 E10 Service Manual Commercial Microwave Oven NE 1257R NE 1257CR 28085805 NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258R Specifications NE 1258R NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R CR Power Source 120 V AC Single Phase 60 2 208 230 V AC Single Phase 60 Hz Power Requirement 2000 W 17 7A 1950 W 17 2A 2650 W 1434 208 V 2600 W 13 8 208 V 3200 W 16 64 208 V 2720 W 13 34 230 V 2580 W 12 3A 230 V 3200 W 15 34 230 V High frequency Output HIGH 2100 W MED 1050 W LOW 340 W Microwave Frequency 2 450 MHZ Timer Maximum programmable time for single stage heating and MED power 15 min DEF z 30 min Outside Dimensions 16 5 8 W X 20 D X 13 3 16 H 422 mm W X 508 mm D X 337 mm H Inside Dimensions 13 W X 12 3 22 D X 6 7 8 H 330 mm W X 310 mm D X 175 mm H Weight 58 Ibs 26 3 kg 62 1 28 3 kg 65 Ibs 29 5 kg Output power IEC705 88 Test procedure Specifications subject to change without notice 2000 Matsushita Electric Industrial Co Ltd All P n ni rights reserved Unauthorized copying distribution is a violation of law NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258R A WARNING This service information is designed for experienced repair technicians only and is not designed for use by the general publi
32. S s 32 21 PROCEDURE FOR MEASURING MICROWAVE ENERGY LEAKAGE tenente nennen nennen 33 22 TROUBLESHOOTING GUIDE 35 23 EXPLODED VIEW AND PARTS LIST T 36 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258 24 PARTS LIST nennen 37 25 DOOR ASSEMBLY nennen 40 26 ESCUTCHEON BASE ASSEMBLY 41 27 PACKING AND ACCESSORIES 42 28 WIRING MATERIAL 111111155 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 33 DIGITAL PROGRAMMER CIRCUIT lt 48 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258R 1 OUTLINE DIAGRAM 9 MED DEF START Digital Display Window see below Power Level Indicator Display Program Pad Shift Pad Power Level Selector Buttons Q Double Quantity Pad Treble Quantity Pad LLL Number Memory Pads Stop Reset Pad D Start Pad Oven Lamp Cover p Door Handle Air Filter Splatter Shield top of inner cavity A Program Display B Heating Time Display min sec C Memory Pad Number Display D 1s
33. TCH B FAN MOTOR 88 DO 88 PROTECTER DIODE SHORT SWITCH ANTENNA MOTOR 123 nnm 0000 UPPER FUSE SAFETY SWITCH B HIGH VOLTAGE DISPLAY LOWER CAPACITOR OVEN LAMP 240V 25W 11 NOTE Door is closed SCHEMATIC DIAGRAM NE 1257CR Unit is not operated NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258R THERMAL CUTOUT UPPER RELAY PRIMARY UPPER gt RY3 RY6 THERMAL CUTOUT UPPER MAGNETRON MAGNETRON UPPER AC120V 60Hz VARISTOR gt lt VARISTOR OPTION FAN MOTOR FAN MOTOR E 1SHORT 1SWITCH 1 UPPER d 1 POWER RELAY POWER UPPER RELAY PRIMARY UPPER RY4 RY ZU HIGH VOLTAGE TRANSFORMER UPPER THERMAL CUTOUT LOWER MAGNETRON KEYBOARD LOW VOLTAGE TRANSFORMER 11 CN102 0000000 CN101 CN105 000000 0 0 0 LATCH SWITCH UPPER PRIMA 1 POWER SUPPLY CIRCUIT BOARD CN104 DIGITAL PROGRAMMER CIRCUIT BOARD Hi DISPLAY CIRCUIT BOARD 123 mm 0000 000 c DISPLAY SAFETY SWITCH A SECONDARY TEMP SENSOR OVEN GROUNDING GROUND CHASSIS GROUND VARISTOR DIODE PROTECTER DIODE FUSE 12 HIGH VOLTAGE TRANSFORM
34. W IEC705 Min 10 6 1700 W IEC705 Min 15 3 2100 W 705 Min 18 1 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258 21 PROCEDURE FOR MEASURING MICROWAVE ENERGY LEAKAGE WARNING periphery the door viewing window the exhaust opening Check for radiation leakage after every servicing s openings should the leakage be more than 2 mW cm 1mW cn for Canada inform PHCC PSC or PCI 21 2 Record keeping and immediately After repairing or replacing any notification after measurement radiation safety device keep a written record for 1 any adjustment or repair to a microwave oven leakage reading must be taken Record this leakage reading on the repair ticket even if it is zero future reference as required by D H H S and Health and Welfare Canada regulation This requirement must be strictly observed In addition the leakage reading must be recorded on the A copy of this repair ticket and the microwave leakage service repair ticket while in the customer s home reading should be kept by repair facility 2 Should the radiation leakage be more than 2 mW cme2 1 NOTE S Government standard is 5 mW cm while mW cm2 for Canada after determining that all parts are in in the customer s home 2 mW cm stated here is our own good condition functioning properly and genuine voluntary standard 1 mW cm for Canada replacement parts as listed
35. as upper antenna e LOWER ANTENNA 08 033M 28 CEILING PLATE 02 031M PLASTIC CLIPS UPPER ANTENNA 02 032M SCREW DRIVER 02 033M 18 6 Replacement of temperature sensor Thermal protector 1 Cut 2 lead wires at the top of sensor terminals NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258 2 Remove 2 screws holding temp sensor and replace with new one 3 Solder the lead wires securely to the sensor terminals 18 7 Disassembly of door assembly 1 Remove each 2 bolts holding upper and lower hinges 2 Open the door and while pulling the door outward work upper and lower hinges out through the holes of the front surface of oven 3 Remove door C check cover from door E by carefully pulling outward starting from the upper right hand corner EXHAUST GUIDE 4 Remove 2 screws holding door handle and separate door A from door 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 08 034M 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 A
36. c It does not contain warnings or cautions to advise non technical individuals of potential dangers in attempting to service a product Products powered by electricity should be serviced or repaired only by experienced professional technicians Any attempt to service or repair the product or products dealt with in this service information by anyone else could result in serious injury or death WARNING This product should be serviced only by trained qualified personnel Though this product has been manufactured in compliance with Federal Performance Standard 21 CFR Subchapter J D H H S U S A models or Radiation Emitting Devices Act Health and Welfare Canada Canadian models It is very important all repairs should be made in accordance with procedures described in this manual to avoid being exposed to excessive microwave radiation Check for radiation leakage before and after every servicing according to the procedure for measuring radiation leakege If the unit cannot be repaired on site advise the customer not to use until unit be repaired 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 Home amp Commercial Products IN PUERTO RICO PSC PHCC Company PSC San Gabriel Industrial Park One Panasonic Way Panaz
37. djust so that the door has no play between the inner door surface and oven front surface If the door assembly is not mounted properly microwave may leak from the clearance between the door and the oven NOTE Please refer MEASURENMENT AND ADJUSTMENT Make sure the gap at both sides are equal 08 035M 02 034M 08 036M 29 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258R 19 COMPONENT TEST PROCEDURE CAUTION 1 High voltage is present at the high voltage terminal of the high voltage transformer during any cook cycle 2 It is neither necessary nor advisable to attempt measurement of the high voltage 3 Before touching any oven components or wiring always unplug the oven from its power source and discharge the high voltage capacitor 19 1 High voltage transformer 1 Remove connections from the transformer terminals and check continuity 2 Normal cold resistance readings should be as follows Secondary winding Approx 80Q 120Q Filament winding Approx 00 Primary winding Approx 00 30 19 2 High voltage capacitor 1 Check continuity of capacitor with meter on highest OHM scale 2 A normal capacitor will show continuity for a short time and then indicate 9MQ once the capacitor is charged 3 A shorted capacitor will show continuous continuity 4 An open capacitor will show constant 9MQ 5 Resistance between
38. e the door 1 minute later display will go blank NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258R 3 WIRING REQUIREMENTS AND POWER SOURCE VOLTAGE SELECTION Wiring Requirements No other appliance should share the circuit with the microwave oven If it does the branch circuit fuse may overload and either cause the oven to heat slower than expected or blow the fuse 1 For Mode NE 1257 The oven must be on a SEPARATE 20 Amp 60 Hz 120V GROUNDED CIRCUIT NE 1257 NE 1258 120 V NEMA ra Grounded 5 20P Outlet NEMA 5 20R 2 For Model NE 1757 a This oven must be on a separate 60 Hz GROUNDED CIRCUIT minimum 15 amps b The microwave ovens are built to operate on 2 different voltages 230 V or 208 V Be sure that the 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 slower heating of the food Panasonic is NOT responsible for damage resulting from the use of the oven with other than specified voltage NE 1757 208 V 230 V NEMA Grounded 6 15 Outlet NEMA 6 15R 3 For Model NE 2157 a This oven must be on a separate 60 Hz GROUNDED CIRCU
39. el and time between steps 3 and 4 above NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258R 3 Memory setting for single stage OPERATION DISPLAY 1 Display must be blank before programming can begin Touch pad 2 Tap 5 pad Set to memory pad 5 NOE Previously selected power and time will appear Tap POWER LEVEL pad once Set to High power 4 Set the desired heating time by tapping number pads 110 0 Set 1 minutes 5 Touch pad again 6 3 seconds after the display window will go blank TO PROGRAM MEMORY AREA B Follow steps 1 above Touch the Memory Shift pad and a small B will appear beneath the flashing PROG Touch the memory pad you wish to program and the previously selected time and power level will appear in the display window NOTE Once the Memory area B has been selected it cannot be changed back to Memory area A If you do not require Memory area B cancel it by touching the cancel pad and begin again 4 Memory setting for 2nd or 3rd stage OPERATION DISPLAY 1 Follow steps 1 to 4 for memory setting for single stage 2 Tap POWER LEVEL pad twice Set to MED power 3 Set the desired heating time by tapping number pads 2 0 0 Set to 2 minutes OPERATION DISPLAY 4 Touch Program pad again Heating is displayed by adding single and 2nd stage heating time WI HH MED 5 9 seconds after the display wi
40. en has been used 99999 99 999 times 1 Plug the power supply cord into wall receptacles 9 seconds later the display will go blank Open the door and leave it open NOTE Total cumulative number includes programming memory heating and manual heating number of times has been used Cooking times over 99 999 times will be back 0 Press pad and then within 1 minute press 0 pad 9 To Activate Program Lock OPERATION DISPLAY 1 Plug the power supply cord into wall receptacle Do not open the door Selected the desired sound loudness level by pressing e pad Repeated pressing of 0 pad will lower the loudness and all the way to silent Press and hold pad until the display show PROG P and for more than 5 seconds Press pad again Program lock feature now activated Close the door 1 minute later display window will go blank NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258 To select length of tone at end of heating cycle there are 2 options A 3 beeps factory setting B 60 seconds of short beeps To set for 60 seconds of short beeps OPERATION DISPLAY 1 Complete steps 1 4 above Do not close the door 2 Touch pad and quickly select the desired tone length by touching 0 pad 1 illuminated 3 beeps 2 illuminated 60 seconds of beeps 3 Press pad again 3 seconds later the display will 0 4 Clos
41. ill hear 3 beeps sound 5 Set the desired magnification by pressing the appropriate number pad ex 1 5 times press 1 and 5 Open the door and remove the water 6 Press the PROG pad again load Close the door 1 minute later display 7 After 3 seconds the display will goes will return blank blank NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258R 8 To Read the Cycle Counter OPERATION DISPLAY 1 3 Open the door and leave it open While pressing STOP RESET pad memory pad The display shows the number of times each memory pad has been used Within 3 seconds pressing the pad to show the number of times the oven has been used in the manual mode ex 6666 6 666 times ZL LL LILI LILI 1 Plug the power supply cord into wall receptacle 2 Open the door Leave it open While pressing STOP RESET pad press and hold pad until the display will show PROG and P for more than 5 seconds 3 Program lock feature is now 10 To Release Program Lock OPERATION DISPLAY DISPLAY m NOTE To read the number of times the oven has been used in the B side programmes Press A B shift pad Then while pressing the STOP RESET pad press each memory pad deactivated 3 Remove your finger from pad and quickly close door while the display is still showing a pad s cycle count Display will now H show the total cumulative number of times the ov
42. ip 4A 5 65th Infantry Ave Km 9 5 Secaucus New Jersey 07094 Carolina Puerto Rico 00985 Attention Service Engineering 809 750 4300 IN CANADA Panasonic Canada Inc PCI 5770 Ambler Drive Mississauga Ontario L4W2T3 905 624 5010 6 There are special components used in the microwave oven which are important for safety These parts are marked with A on the replacement parts list It is essential that these critical parts should be replaced with manufacturer s specified parts to prevent microwave leakage shock fire or other hazards Do not modify the original design PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY A Do not operate or allow the oven to be operated C Before turning on microwave power for any service with the door open test or inspection within the microwave generating B Make the following safety checks on all ovens to be compartments check the magnetron waveguide or serviced before activating the magnetron or other transmission line and cavity for proper alignment microwave source and make repairs as necessary integrity and connections 1 Interlock operation D Any defective or misadjusted components in the 2 Proper door closing interlock monitor door seal and microwave 3 Seal and sealing surfaces arcing wear and generation and transmission systems shall be other damage repaired replaced or adjusted by procedures 4 Damage to o
43. ive radiation emission replace only with identical replacement parts When the 18 25 Amp fuse is blown due to the operation of the Interlock Monitor Switch you must replace A TYPE B 16G 3C26 ANE61424L0AG for Secondary Interlock SW LATCH SW A and V 15G 3C26 ANE6142 F60 for Primary Interlock SW LATCH SW B B TYPE V 16G 2C25 6178410 for Monitor SW SHORT SW C TYPE G5J 1 TP AEBG5B1 8P 1 for Power Relay RY4 D TYPE ABC RATED 250V 18 fuse A62303970AP for NE 1757R CR amp NE 2157R CR or 25A fuse ANE6230P90AP for 1257R CR and NE 1258R 20 1 Installation of Safety switch A Safety switch B and Short switch 1 When mounting Safety switch A Safety switch B and short switch to door hook assembly mount the Safety switch A Safety switch B and the short switch to the door hook assembly as shown in Figure NOTE No specific adjustment during installation of Safety switch A Safety switch B 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 Figure so that the oven door will not have any play in it Check for play in the door by pulling the door assembly Make sure that the latch keys move smoothly after adjustment it completed Completely tighten the screws holding the door hook assembly to the oven assembly Reconnect the short
44. minal you must hold the plastic connector instead of the lead wire and then disconnect it otherwise lead wire may be open or the connector cannot be removed 5 Be sure to ground any static electric charge built up in your body before handling the D P C 6 A 120 208 230V AC s present at the shaded area of the power supply circuit board 9Terminals of power relays and primary circuit of low voltage transformer When troubleshooting be cautions of possible electrical shock hazard O First of all operate the microwave oven following the correct operating procedures described on pages 3 of this service manual in order to find the exact cause of any trouble NOTE If the unit shows faulty symptom as shown below check the parts listed in possible cause column depending on failure indication e g F81 F82 in the display TROUBLE 1 Oven does not operate at all or oven does not start cooking CONDITIONS POSSIBLE CAUSE TIMING OF FAILURE INDICATION Open temperature 1 Temperature sensor failure It is appeared when failure occured sensor exhaust 2 Digital programmer circuit failure 3 Loose connector 4 F34 Short temperature 1 Temperature sensor failure It is appeared when failure occured sensor exhaust 2 Digital programmer circuit failure 1 Shorted power select switch It is appeared 2 miniued after failure occured 2 Shorted membrane switch Exhaust temperature 1 Burning food the oven due to over cook It
45. ndow will become blank NOTE For a 3rd stage heating cycle select a further power level and dial in a time between steps 3 and 4 above 5 Memory pad heating OPERATION DISPLAY 1 Plug the power supply cord into wall receptacle 2 Open the door Place a water load in the oven and close the door 4 Tap START pad 1st stage 5 2nd stage 6 When the time is up you hear 3 beeps sounds 7 Open the door and take out the water load 8 Close the door Display will return blank after 1 minute NOTE When program is locked heating can be started automatically by tapping memory pad NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258 6 Programming Double or Treble Quantity Pad 7 Memory Pad Heating for Dpouble or Treble Quantity Heating OPERATION DISPLAY OPERATION DISPLAY 1 The display window must be blank 1 Open the door place a water load in before programming can begin the oven and close the door 2 Press the pad 2 Press the x2 pad NOTE When you want treble quantity PROG heating press x3 pad r 3 Press 0 pad Press the desired memory pad The pad number and previously ex memory 0 program No A 0 selected time and power will appear 4 Press pad Press pad The previously programmed magnification number appear ex 6 means 1 6 times When you want program for treble quantity heating press x3 pad When the time is up you w
46. near these circuits with oven energized DO NOT measure the voltage in the high voltage circuit including filament voltage of magnetron 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 voltage capacitor terminal of lead wire from diode to chassis ground with an insulated jumper lead wire or an insulated handle screwdriver discharge 24 HIGH VOLTAGE L CAPACITOR DIODES SHORT ACROSS DIODE 08 174M Discharge the 2 High Voltage Capacitors Touch chassis side first then short to the high voltage capacotor terminal Important Note 1 High voltage above 250 volts exist on following parts during operation Magnetron High Voltage Transformer High Voltage Diode High Voltage Capacitor Extra attention and caution should be used during repair or troubleshooting procedures 2 If the microwave oven is operated with an incorrectly installed door hinge or magnetron it can cause microwave leakage of over 5mW cm It is absolutely necessary to check if magnetron and door hinges are correctly and safely installed after repairs or replacement WARNING Never touch any circuitry either your hand insulated tools while oven in energized 17 4 When
47. or housing Y H SYMBOL COLOUR BLACK RED 19 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258R 13 WIRING DIAGRAM NE 1757CR NOTE When replacing check the lead wire color as shown Magnetron UPPER LOWER HIGH VOLTAGE CAPACITOR UPPER HIGH VOLTAGE TRANSFORMER Magnetron HIGH VOLTAGE UPPER LOWER TRANSFOR LOWER NOTE When replacing check the lead wire color as shown WIRING DIAGRAM Colors shown by indicate colors of lead wire connector housing Y BR w w SAFETY SWITCH A Y SYMBOL COLOUR BLACK RED SAFETY SWITCH B UPPER SAFETY SWITCH B LOWER 20 14 WIRING DIAGRAM NE 2157R NOTE When replacing check the lead wire color as shown HIGH VOLTAGE TRANSFORMER UPPER SAFETY SWITCH B LOWER Magnetron UPPER Magnetron LOWER SAFETY SWITCH B UPPER HIGH VOLTAGE TRANSFOR LOWER NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258 LOWER HIGH VOLTAGE CAPACITOR UPPER NOTE When replacing check the lead wire color as shown Colors shown by indicate colors of lead wire
48. r loosening of hinges and latches described in this manual before the oven is 5 Evidence of dropping or abuse released to the owner E A microwave leakage check to verify compliance with the Federal Performance Standard should be performed on each oven prior to release to the owner CONTENTS 1 OUTLINE DIAGRAM 4 SCHEMATIC DIAGRAM NE 1757CR 14 2 OPERATION PROCEDURE 5 8 SCHEMATIC DIAGRAM NE 2157R 15 3 WIRING REQUIREMENTS AND POWER SOURCE VOLTAGE 9 SCHEMATIC DIAGRAM 2157 16 SELECTION 10 10 WIRING DIAGRAM NE 1257R 1258 17 4 SCHEMATIC DIAGRAM NE 1257R NE 1258R 11 11 WIRING DIAGRAM NE 1257CR M MMA 18 5 SCHEMATIC DIAGRAM NE 1257CR 12 12 WIRING DIAGRAM NE 1757R 19 6 SCHEMATIC DIAGRAM NE 1757R 7 7 13 13 WIRING DIAGRAM NE 1757CR 20 14 WIRING DIAGRAM NE 2157R ss 21 15 WIRING DIAGRAM NE 2157CR lt lt 16 DESCRIPTION OF OPERATING SEQUENCE 17 CAUTIONS TO BE OBSERVED WHEN TROUBLESHOOTING 24 18 DISASSEMBLY AND PARTS REPLACEMENT PROCEDURE 26 19 COMPONENT TEST PROCEDURE 30 20 MEASUREMENTS AND ADJUSTMENT
49. re connector housing Y 17 w SYMBOL COLOUR BLACK RED NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258R 11 WIRING DIAGRAM NE 1257CR NOTE When replacing check the lead wire color as shown Magnetron UPPER LOWER HIGH VOLTAGE CAPACITOR UPPER HIGH VOLTAGE TRANSFORMER Magnetron HIGH VOLTAGE UPPER LOWER TRANSFOR LOWER NOTE When replacing check the lead wire color as shown Colors shown indicate colors of lead wire connector housing Y w SYMBOL COLOUR BLACK RED SAFETY SWITCH B UPPER SAFETY SWITCH B LOWER 18 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258 12 WIRING DIAGRAM NE 1757R NOTE When replacing check the lead wire color as shown HIGH VOLTAGE TRANSFORMER UPPER SAFETY SWITCH B LOWER Magnetron UPPER Magnetron LOWER SAFETY SWITCH B UPPER RIGHT LOWER HIGH VOLTAGE CAPACITOR UPPER LEFT HIGH VOLTAGE TRANSFOR LOWER NOTE When replacing check the lead wire color as shown Colors shown by indicate colors of lead wire connect
50. t Stage Heating Indicator E 2nd Stage Heating Indicator F 3rd Stage Heating Indicator G Power Level Indicator NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258 2 OPERATION PROCEDURE 1 Manual heating for single stage OPERATION DISPLAY 1 Plug the power supply cord into wall 2 Manual heating for 2nd or 3rd stage OPERATION DISPLAY 1 Follow step 1 to 4 single stage receptacle Open the door Place a water load in the oven and close the door Tap POWER LEVEL pad once Set to High power Set desired heating time by tapping number pads 210 0 Set to 2 minutes Tap START pad When the times is up you hear 3 beeps sound Open the door and take out the water load The display goes back to previously setting time Close the door 1 minute later display will return blank Tap POWER LEVEL pad twice Set to MED power Set the desired heating time by tapping number pads 1 o 0 Set to 1minute Tap START pad 1st stage n an HI MED When the 1st stage time is up you hear 1 beep sound 2nd stage When the times is up you hear 3 beeps sound Open the door and take out the water load The display goes back to previously PAS ir HUH setting time HI MED Close the door 1 minute later display will return blank NOTE For a 3rd stage heating cycle select a further power lev
51. tor plug into the socket and store the black plug in the rectangular opening CAUTION Make sure that the power cord is unplugged before removing the voltage selection panel cover VOLTAGE SELECTION CONNECTOR VOLTAGE SELECTION NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258 4 SCHEMATIC DIAGRAM NE 1257R NE 1258R MAGNETRON NOTE Door is closed THERMAL CUTOUT Unit is not operated HIGH VOLTAGE OVEN TRANSFORMER STIRRER MOTOR UPPER AC120V 60Hz lt HIGH VOLTAGE CAPACITOR LOWER DIODE UPPER FAN MOTOR FAN MOTOR LOWER VARISTOR OOOOOD VOCE LATCH swe SWITCH B LOWER PRIMARY MAGNETRON LOWER HIGH VOLTAGE TRANSFORMER o sw7 SHORT 1 LOWER HIGH VOLTAGE FAN MOTOR tow eM CAPACITOR UPPER DIODE LOWER LOW VOLTAGE POWER SUPPLY CIRCUIT BOARD TRANSFORMER t CN100 _ CN105 KEYBOARD 4 x SAFETY SWITCH A SW8 SECONDARY DIGITAL PROGRAMMER CIRCUIT BOARD TEMP SENSOR OVEN ii GROUNDING THERMAL CUTOUT SHORT SWITCH DISPLAY GROUND UPPER MAGNETRON LOWER CN250 CIRCUIT CHASSIS GROUND THERMAL CUTOUT SAFETY SWITCHA 15i pte BOARD LOWER MAGNETRON SECONDARY VARISTOR THERMAL CUTOUT RELAY OVEN PROG DIODE SAFETY SWI
52. wave 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 ON OFF TIME ON POWER RELAYS DOOR OPEND O Start B DOOR CLOSED Stop DEFROST 96 002M 23 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258R 17 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 17 1 Check the grounding Do not operate on a 2 wire extension cord The microwave oven is designed to be used in a completely grounded condition It is imperative therefore to make sure it is properly grounded before beginning repair work 17 2 If the door lock the door switch the door seal or the door develops a malfunction be sure not to operate the oven until complete repairs are made If the oven is operated with any of these parts in imperfect condition hazardous microwave leakage might occur WARNING There is high voltage present with high current capabilities in the circuits of the high voltage winding and filament winding of the high voltage transformer It is extremely dangerous to work on or
53. ween the 08 029M waveguide and the magnetron CAUTION When connecting 2 filament lead wires to the magnetron terminals be sure to connect the lead MAGNETRON UPPER wires in the correct position The leas wire with blue connector should be connected to trminal and white or pink one should be connected to terminal MAGNETRON LOWER 08 030M 26 MOUNTING BRACKET SLIDE IN OUT 08 031M Removal of Positive Lock connector The positive lock connector is a specially designed loose free connector and you will find this connector in many lead wire connections To remove this connector pull the lead wire by pressing an extruded lever in the center of receptacle terminal as shown 18 2 Replacement of power supply circuit board NOTE Be sure to ground any static electric charge built up on your body before handling the power supply P C B and D P C 1 Disconnect all lead wires from power supply circuit board 2 Remove 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 assembl
54. y to detach it main unit then remove connectors 3 Remove 2 screws holding the D P C board and while pushing back on 2 plastic holding clips remove the board NOTE Please use care in handling the power supply P C B and D P C board to avoid damage 27 NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258 HOW TO DISCONNECT SPECIAL LOCK CONNECTOR 05 007M HOW TO DISCONNECT POSITIVE LOCK CONNECTOR LOCKING CLIP POSITIVE LOCK CONNECTOR 08 032M 08 175M NE 1257R NE 1257CR NE 1757R NE 1757CR NE 2157R NE 2157CR NE 1258R 08 021M 18 4 Replacement of upper antenna CAUTION The upper and lower rotating antennas are different type and are not interchangeable each other Care should be taken not to reverse the top and bottom antennas 1 Remove ceiling plate by gently moving the left and right tabs inward while pulling the plate down and outward 2 Using a small flat screwdriver or the like remove two plastic clips located on the antenna ring Nest turn the antenna ring approx 1 8 turn 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
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