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7-16

COMPONENTS

TEST PROCEDURES

RESULTS

HIGH-VOLTAGE

CAPACITOR

HIGH-VOLTAGE

DIODE

Measure the resistance:
(1) Terminal to terminal

Ohm-
meter

(2) Terminal to case

Ohm-
meter

Measure the continuity:
(1) Forward

Ohm-
meter

(1) Reverse

Ohm-
meter

Normal reading:

Momentarily indicates several ohms,
and then gradually returns to infinite
ohms.

Abnormal reading:

Indicates continuity or infinite ohms
from the beginning.

Normal readings:

Infinite.

Abnormal reading:

Indicates continuity.

Normal readings:

continuity.

Abnormal reading:

Infinite.

Note : Meter reading depend on the

battery in the Meter.

Normal readings:

Infinite.

Abnormal reading:

continuity.

Figure 24-a

Figure 24-b

Figure 25-a

Figure 25-b

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Содержание NN-S251WL

Страница 1: ...mer Outside Dimensions Oven Cavity Dimensions Weight 120 V AC 60 Hz 13 5 Amps 1 550 W 1000 W Full Power IEC 60705 2 450 MHz 99 min 99 sec 197 8 W X 815 16 H X 143 16 D 505mm W X 227mm H X 360mm D 2915 16 W X 167 16 H X 153 8 D 760mm W X 418mm H X 385mm D Approx 52 lbs 23 5 kg Specifications subject to change without notice APH NN S251WL NN S251BL Microwave Oven ORDER NO MOD 0106244C1 E2 Service Ma...

Страница 2: ...n the microwave oven which are important for safety These parts are marked with a w on the replacement parts list It is essential that these critical parts should be replaced only with the manufacture s specified parts to prevent microwave leakage shock fire or other hazards Do not modify the orginal design PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESS...

Страница 3: ...GRAM 5 1 MATRIX CIRCUIT FOR TOUCH KEY BOARD 5 2 GENERAL INFORMATION FOR SERVICE 6 1 GENERAL PRECAUTIONS IN USE 6 1 TRIAL OPERATION 6 1 FEATURES AND SPECIFICATIONS FEATURES 6 1 SERVICE INFORMATION 7 1 PRECAUTIONS AND REPAIR SERVICE TIPS 7 1 PROCEDURE FOR MEASURING MICROWAVE ENERGY LEAKAGE 7 2 POWER OUTPUT MEASUREMENT 7 3 DISASSEMBLY INSTRUCTIONS 7 4 INTERLOCK SYSTEM 7 12 INTERLOCK CONTINUITY TEST 7...

Страница 4: ...ary Interlock Switch Secondary Interlock Switch Interlock Monitor Magnetron 2M214 39F High Voltage Capacitor Capacitor 1 0µF 2 1 KV AC High Voltage Diode Diode 350mA 9 0 KV Cook top Lamp 125 V 30 W Cavity Lamp 125 V 30 W Timer Digital up to 99 mim 99 sec in each cooking stage Tray Tempered Safety Glass Overall Dimensions 2915 16 W x167 16 H x153 8 D Oven Cavity Size 197 8 W x815 16 H x143 16 D Eff...

Страница 5: ...equires that the magnetron be assembled to the waveguide and cavity Never operate the magnetron unless it is properly installed Be sure that the magnetron gasket is properly installed around the dome of the tube whenever installing the magnetron Unlike other appliances the microwave oven is high voltage and high current equipment Though it is free from danger in ordinary use extreme care should be...

Страница 6: ...d at all times In the event of an electrical short circuit grounding reduces the risk of electrical shock The plug must be plugged into an outlet that is properly installed and grounded BEFORE YOU BEGIN READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY WARNING Improper use of the grounding plug can result in a risk of electric shock Do not under any circumstances cut or remove the third gro...

Страница 7: ...4 1 FEATURE DIAGRAM See through Oven Window Door Handle Identification Plate Menu Label Cover do not remove Oven Air Vent Control Panel Cooktop Light Grease Filter Door Safety Lock System Glass Tray ...

Страница 8: ...o enter cooking time power level quantities or weights 8 Timer Pad Touch this pad to set the kitchen timer 9 Clock Pad Touch this pad to enter the time of day 10 Timer Off Pad Touch this pad to stop timer function 11 Function Pad Touch this pad to change the oven s default settings for sound clock display speed defrost weight and demo mode operations 12 Quick Min Pad Touch this pad to set and star...

Страница 9: ...5 1 SCHEMATIC DIAGRAM OVERALL CIRCUIT DIAGRAM ...

Страница 10: ...MATRIX CIRCUIT FOR TOUCH KEY BOARD 5 2 ...

Страница 11: ...y light comes on The unit will begin cooking and the display window will show the time counting down by seconds D After about 5 minutes make sure the primary interlock switch the secondary interlock switch and the interlock monitor switch operate properly by opening and closing the door several times Touch the START key each time the door is closed E Continue operating the unit Four long beep soun...

Страница 12: ...All service adjustments should be made for minimum microwave energy leakage readings 3 Do not operate the unit until it is completely repaired if any of the following conditions exist The unit must not be operated a The door does not close firmly b The hinge is broken c The door seal is damaged d The door is bent or warped or there is any other visible damage on the unit that may cause microwave e...

Страница 13: ...gnetron measure for radiation leakage before the outer panel is installed and after all necessary components are replaced or adjusted Special care should be taken in measuring around the magnetron 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 openi...

Страница 14: ...in good condition functioning properly and genuine replacement parts which are listed in this manual have been used 3 At least once a year have the electromagnetic energy leakage monitor checked for calibration by its manufacturer 1 Microwave power output measurement is made with the microwave oven supplied at its rated voltage and operated at its maximum microwave power setting with a load of 100...

Страница 15: ... ESPECIALLY SWITCHES AND HIGH VOLTAGE CIRCUIT BEFORE A GRILLE HAVE TO REMOVE FIRST A REMOVING POWER AND CONTROL CIRCUIT BOARD Figures 1 2 and 3 1 Remove a screw securing the control panel assembly to the oven cavity 2 Remove the control panel with pushing it upward 3 Remove the connector CN1 and wire leads Relay7 from the circuit board 4 Remove 3 screws securing the circuit board 5 Remove the FPC ...

Страница 16: ... F P C connector into the terminal socket securely with the fingers 2 Hold the plastic fastener with thumb and forefinger of the other hand and push it slowly into the terminal socket Figure 6 NOTE When reconnecting the F P C connector make sure that the holes on the F P C connector are properly engaged with the hooks on the plastic fastener 3 Lock the level of the plastic fastener into the hook o...

Страница 17: ... removing the two screws securing it to the outer case 5 Remove the base plate by removing six screws securing it to the outer case Remove the Mount from the out case by removing two screws securing it to the outer case and one screw securing it to the ventilation motor ASS Y and cavity 6 Remove the power cord cover from outer case by removing a screw Vent Grille Control Panel Mounting Plate Door ...

Страница 18: ... page 7 12 Door Hook Secondary Interlock Switch Interlock Monitor Switch Primary Interlock Switch Figure 10 WIRE COLOR SYMBOL COLOR WH YL RD N P WHITE YELLOW RED GN GREEN Not Provided Door Hook WH from H V Transformer WH from Monitor S W WH from Oven Thermostat WH from Cooktop lamp Secondary Interlock Switch Monitor Interlock Switch Primary Interlock Switch GN from P C B YL from P C B WH from Seco...

Страница 19: ... may be damaged When replacing the magnetron be sure to install the magnetron gasket in the correct position and be sure that the gasket is in good condition After replacing the magnetron check for microwave energy leakage with a survey meter Microwave energy leakage must be below the limit of 5 mW cm2 All service adjustments should be made for minimum microwave energy leakage readings 7 8 Figure ...

Страница 20: ...monitor switch is in good operating normally After replacing the door check for microwave energy leakage with a survey meter Microwave energy leakage must be below the limit of 5mW cm2 With a 275 ml water load F DISASSEMBLING DOOR Figure 15 1 Remove the dielectric choke by using knife blade or small screw driver etc 2 Remove two screws securing it to the door handle CAUTION Be careful not to damag...

Страница 21: ...waves may leak from the clearance between the door and the oven H REMOVING THE VENTILATION FAN ASS Y 1 Remove the mounting plate by removing two screws securing it to the back plate See Figure 16 2 Remove the two screws securing the MOUNT and one screw securing the ventilation fan ASS Y See Figure 17 3 Carefully pull the ventilation motor ASS Y out of the microwave oven See Figure 18 7 10 Figure 1...

Страница 22: ...ecuring it to the oven cavity Figure 20 4 Disconnect the leadwire from the turntable motor terminals 5 Remove the 2 screws securing the turntable motor to the oven cavity ASS Y Figure 21 NOTES Remove the leadwire from the turntable motor VERY CAREFULLY Be sure to grasp the connector not the wires when removing Terminals Turntable Motor Figure 21 Figure 19 Figure 20 Base Plate 7 11 ...

Страница 23: ...nt of the latch board may not be necessary Go to Steps 5 and 6 to check the sequence of the switches NOTE To correct sequence of the Primary Interlock Switch Secondary Interlock Switch and the Interlock Monitor Switch is very important If any gap is larger than 1 64 0 5 mm you will need to adjust the latch board Go to step 3 and follow all steps in order ADJUST THE LATCH AND SWITCH CLOSING 3 Loose...

Страница 24: ...ro to the body of the switches in the following sequence Interlock Monitor Switch Primary Interlock Switch Secondary Interlock Switch NOTE The Interlock Monitor Switch is an added safety check on the Primary and Secondary Interlock Switches If the Primary and Secondary Interlock Switches allow the oven to operate with the door open the Monitor Switch will blow the fuse 7 When you achieve the prope...

Страница 25: ...cate an closed circuit When the secondary switch operation is abnormal make the necessary adjustment or replace the switch only with the same type of switch C MONITOR SWITCH TEST Disconnect the wire lead from the monitor switch Connect the ohmmeter leads to the common COM and normally closed NC terminals of the switch The meter should indicate closed circuit in the door open condition When the doo...

Страница 26: ... each filament terminal of the magnetron and the chassis ground with an ohm mater on high test scale 1 Measure the resistance With an ohm meter on Rx1 scale a Primary winding b Filament winding c Secondary winding 2 Measure the resistance With an ohm meter on highest scale a Primary winding to ground b Filament winding to ground Normal reading Less than 1 ohm Normal reading Infinite ohms NOTE Repl...

Страница 27: ...mal reading Momentarily indicates several ohms and then gradually returns to infinite ohms Abnormal reading Indicates continuity or infinite ohms from the beginning Normal readings Infinite Abnormal reading Indicates continuity Normal readings continuity Abnormal reading Infinite Note Meter reading depend on the battery in the Meter Normal readings Infinite Abnormal reading continuity Figure 24 a ...

Страница 28: ...holes on the FPC connector are properly engaged with hooks on the plastic fastener MATRIX CIRCUIT FOR TOUCH KEY BOARD CONNECTOR KEY CON For detail matrix circuit of each model refer to page 5 2 7 17 COMPONENTS TEST PROCEDURES RESULTS TOUCH KEY BOARD Resistance value When When not touched touched Less than More than 400 ohms 1 mega ohm FPC CONNECTOR Top ...

Страница 29: ...r the interlock monitor switch Malfunction of the high voltage transformer the high voltage capacitor including the diode the magnetron the blower motor or the circuit board PROBLEMS CAUSES POWER LEVEL 1 2 3 4 5 6 7 8 9 10 4 sec 6 sec 8 sec 10 sec 12 sec 14 sec 16 sec 18 sec 20 sec 22 sec 18 sec 16 sec 14 sec 12 sec 10 sec 8 sec 6 sec 4 sec 2 sec 0 NOTES If the fuse is blown by an improper switch ...

Страница 30: ...Does the unit still operate GOOD Replace the circuit board Replace RELAY7 PROBLEM B Vent fan motor and oven lamp turn on When the door is closed and START key is touched Measure the voltage at pin NO 4 5 6 of U01 Voltage reading 0 Vdc Replace the circuit board Defective RELAY7 or poor connection of RELAY7 Defective RELAY7 Replace RELAY7 or correct the connection NO NO YES YES NO NO YES YES GOOD ...

Страница 31: ...the interlock switches the door sensing and the relay check good 2 The unit with a normal relay continuously operates 3 Proper temperature measurement is not obtained 4 The buzzer does not sound or continues to sound 5 Some segments of one or more digits do not light up or they continue to light up or segments light when they should not 6 Wrong figures appear 7 The figures of all digits 8 Some of ...

Страница 32: ...PERATION on page 6 1 DISPLAY Problems A thru C HELP UP Problems D thru E BUZZER Problems F Measure voltage between pin 1 and pin 3 of connector CN1 Measure resistance of touch key board after removing connector S1 See page 7 4 and 7 17 0 120 120V Replace circuit board Normal circuit board Normal resistance Voltage incorrect Normal resistance Resistance incorrect Replace touch key board Normal touc...

Страница 33: ... H V C Abnormal Replace H V D Normal Magnetron Replace Magnetron Normal Normal H V D Check the continuity of H V D see page 7 16 Replace H V C Normal resistance Replace H V T Normal resistance NO continuity Replace circuit board Normal circuit board Poor contact Replace circuit board Normal circuit board Contact OK Normal contact Correct seating Check contact of connector S1 Check the contact of r...

Страница 34: ...7 23 PROBLEM F No buzzing when touching the key between stages or at end of cooking 1 Normal circuit board Check normal operation circuit board Replace circuit board Runs ...

Страница 35: ...ontact OK NO contact Replace oven thermostat Poor contact Replace circuit board Normal circuit board Contact OK Normal contact Correct seating Check contact of connector S1 see page 7 4 Replace ventilation motor ASS Y NO runs Normal ventilation motor ASS Y Check the contact of oven thermostat Runs Runs Runs Runs ...

Страница 36: ...8 1 SCHEMATIC DIAGRAM OF P C B ...

Страница 37: ...8 2 PRINTED CIRCUIT BOARD ...

Страница 38: ...3 2 1 EXPLODED VIEW DOOR PARTS MODEL NN S251 4 1 9 7 65 6 5 8 ...

Страница 39: ... 2 ESCUTCHEON BASE ASSEMBLY 12 10 13 14 11 67 60 66 ...

Страница 40: ... 3 OVEN CAVITY PARTS 26 64 63 65 66 18 16 21 23 24 25 66 66 19 17 15 20 64 22 22 27 ...

Страница 41: ... 4 DOOR HOOK PARTS 31 28 32 69 30 29 61 ...

Страница 42: ... 5 INTERIOR PARTS I 65 42 33 35 36 37 62 63 34 39 41 38 60 43 63 60 40 63 44 60 60 60 ...

Страница 43: ... 6 INTERIOR PARTS II 45 53 46 48 49 51 65 65 60 55 50 47 54 52 ...

Страница 44: ... 7 INSTALLATION PARTS VINYL BAG 57 56 59 58 ...

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