precautions to be observed before and during
Contents
1. w BU Wo BU X HF Triac A 7104 1 pis 5 HF Relay Relay gt 4922 4902 LI L m 3 72 R P6 lo GY Motor Capacitor Power Resistor Hood Exhaust Fan on Medium Low and Medium Speed Manually Electronic Control Cavity Fuse Cavity L Filter Thermostat 2 20 Amp Thermostat 1 ransformer P5 4 _ d BK Kp BK 29 P241 Bu F BU w BU Wie BU Triac e 7104 6 2 0 0 OT D P3 4 w w H F 5 HF Relay HFRelay BU BU z 4922 4902 ir Y Y 2 Ae Motor Capacitor Hood Exhaust Fan on High Medium Manually c Electronic Control Cavity avity Fuse A Filter Thermostat 2 20 Amp Thermostat 1 NS S E BK BK BR 5 ransformer Bi BU P54 BU w BU w BU T Bk PS r 5 HF Relay HF Relay BU o BU i 4922 4902 Y Y 1 Lot Lo S Motor Capacitor P6 5 Microwave Oven Plugged In Time of Day Displayed Electronic Control Cavity Fuse Filter Thermostat 2 20 Amp Cavity Thermostat 1 Filter N L S BK d Y BK e BR 1 BU as BU e PE e TES d t ie e m Cavity LV Thermostat 1 Filter N Trans2. 50 E Uspioo ET 8 sH E e 9 5 i X 8 8 k 5 o yams NT dime Ju z m AUM m JOJIUOJN amp e Th esq a gt 3 18150 9 HH eo eqni peu 29 Jopoedeg 58 JO OW 1 LS gt Ea eo e o o 9 2 oee oM 8 MDN ws p sowy M 5 e S JeISOWOY xoopieju D E F Yy T G X H zu fi c w a PS PQ amp amp K SAM 2 L U SY WS ny a T SR 7 m N M SS 5 R A Hood fan motor assembly 1 H V transformer T Light holders B H V capacitor J FC thermoactuator U Hood cooktop light C AC line filter K H V diode V Monitor interlock switch D Magnetron thermostat opens at 257 F L Power resistor W Primary interlock switch 125 C closes at 185 F 85 M Fuse holders X Turntable motor E Magnetron N Line fuses Y Cavity light F Cavity thermostat 1 opens at 275 F O Motor capacitor Z FC thermostat opens at 329 F 135 C closes at 31 F 35 C Hood thermistor 165 C closes at 257 F 125 C G Cavity thermostat 2 opens at 275 F Q Electronic control AA FC thermistor 135 C closes at 31 F 35 C R Touch panel AB FC ring heater H Humidity sensor S Secondary interlock switch AC FC motor Primary Secondary and Monitor Interlock Switch Checkout Procedures Swit
3. if the STOP CLEAR button is pressed during this diagnostic routine you will exit the test mode Key Tables for Test Mode Key Name Function Display Buzzer Key Name Function Display Buzzer Start 1 beep Baked Potato Key 31 1 beep Setup Menu NTC Sensor NTC Message 1 beep Dinner Plate Key 32 1 beep Check Quick Defrost Key 36 1 beep Light Key 03 1 beep 0 Microwave Oven On MW TB 1 beep Vent Fan Key 04 1 beep 1100 W for 10 Seconds Timer Set Off 05 1 beep Relay 4903 amp Relay 4910 NO Warm Hold Key 06 1 beep 1 Cavity Light On CL 1 beep Clock 07 1 beep Relay 4901 Turntable On Off Key 09 2 Cavity Light amp Turntable TT 1 beep une e Y Relay 4901 amp Add 30 Sec 20 1 beep Relay 4906 Cook Time Key 21 1 beep 3 15000 for on On MW 1 beep Cook Power Key 22 1 beep Polos 408 A Relay 4910 NC Cook Test Humidity Humidity Sensor 1 beep Maid Sensor Message 4 FC Heater On for FC 1 beep Reheat Key 24 1 beep Helse aoa Defrost Key 25 1 beep 5 FC Fan On Relay 4921 FC FAN 1 beep Kids Menu 2 Key 26 1 beep 6 Cooktop Light On HL_HIGH 1 beep High Relay 4911 Soften Melt Key 29 1 beep 7 Cooktop Light On HL LOW 1 beep Convect Bake Test FC FC Sensor 1 beep Low Relay 4912 Sensor Message 8 Hood Fan On High HF HIGH 1 beep Convect Roast Key 2B 1 beep Speed Relay 4902 Relay 4922 amp Triac
4. 7104 Steam Simmer Key 2D 1 beep 9 Hood Fan On Low HF LOW 1 beep Popcorn 30 1 Speed Relay 4902 amp Triac 7104 Stop Clear Exit Test Mode to 1 beep Standby 1 Place 8 oz 250 mL of lukewarm water in the center of the NOTE If the water takes longer than 2 minutes to heat microwave oven this may indicate either the operating voltage is lower 2 Operate on HIGH power level for 2 minutes Water should than 110 volts or there is a problem with the microwave be hot oven NOTE Many of the problems listed in the chart below may be solved by power cycling Unplug microwave oven or disconnect power After 1 minute plug in microwave oven or reconnect power Display Likely Failure Condition Flashing Power failure colon Recommended Repair Procedure After a power failure the colon will be flashing Press any key to end this indication The colon will then be steady when in standby F2 Touch panel failure D NO gt D Unplug microwave oven or disconnect power Replace touch panel Replace all parts and panels before operating Plug in microwave oven or reconnect power If problem persists unplug microwave oven or disconnect power Replace electronic control Replace all parts and panels before operating Plug in microwave oven or reconnect power F3C Cavity temperature sensor failure LONG RON Unplug microwave oven or disconnect power Check cav
5. Relay Light w 4901 _ GY e 0 0 2 3 T 1 i gk 9 1 P3 3 W e w 90e IHF Relay HF Relay uir BU e BU HF 4922 4902 1 fed hd Y i a R R o o GY GY Motor Capacitor P6 5 Wire Power Resistor Microwave Sensor Cooking Electronic Control L V Transformer is Bo pahe qe pene Sg OR 1 Magnetron P2 7 Thermostat Cavity Fuse 1 Turbo Rel HV Secondary L i Thermostat2 20 Am l MW Rela aie ner Interlock Cavity BR Filter BK B p B m 4908697 4910 Transformer Bu Switch yy Thermostat gy pts eK 216 0 o 8 primary 1 Fuse nterloc 120A Switch T Relay 0 Amp Turntable Ie 0 0 22 BK rro BU BU DEC whe BU 5 denso E mr 6 um Tug p2 3 81 HF Triac P6 1 I Z 104 VW 3 3 BK BK 1 ot w w HF Relay HF Relay 7 BU BU HF i 4922 L 4902 Y Y ASRS Ee BEEN LARAR GY P6 5 Loc Motor Capacitor Power Resistor FC Heater Circuit i Electronic Control Cavity Fuse 7
6. Switch Switch Switch Do not continue with the diagnostics of appliance if the 3 Check for loose wiring or incorrect wiring within household fuse is blown a circuit breaker is tripped or if there microwave oven is less than 120 volt power supply at the wall outlet 4 All testing must be done with an ohmmeter having a Complete the following steps before checking microwave sensitivity of 20 000 ohms per volt DC or greater and oven circuitry powered by at least a 9 volt battery 1 Unplug microwave oven or disconnect power 5 All operational checks using microwave energy must be done with the microwave oven loaded with a minimum of 2 Discharge high voltage capacitor and disconnect white V 1 r 8 oz 250 mL of water in a microwave safe container wire from power transformer Microwave Non sensor Cooking Electronic Control i LV BR 5 4 P2 4 pz 1 80 1 1 OR po 7 Magnetron Cavit Fuse I ermostat Second Cavit Turbo Rel L Eifer Thermostat 2 20 Amp MW Relay urho Transtol Interlock Thermostat 1 p BE BK Ap i o 2 BU W V d BU Interlock Fuse Switch TT Relay 20 Turntable 4906 Motor LE BK BU BU 5 1 P5 2 5 I e EU E Cavity CL
7. before operating Plug in microwave oven or reconnect power IMPORTANT W Unplug microwave oven or disconnect power W Conduct a microwave energy test after performing any W Remove the lead wires from the related component tests or repairs to the microwave oven before conducting any of the following tests W Check that all wire leads are in the correct positions W Discharge the high voltage capacitor and remove the before operating the microwave oven lead wires from the primary winding of the high voltage Grasp wire connectors when removing the wire leads transformer before conducting any of the following tests Al operational checks using microwave energy must be done with the microwave oven loaded with a minimum from microwave oven parts Wi All testing must be done with an ohmmeter having a sensitivity of 20 000 ohms per volt DC or greater and powered by at least a 9 volt battery of 8 oz 250 mL of water in a microwave safe container Components Test Results H V Transformer 1 Unplug microwave oven or disconnect power 2 Remove wire leads Filament orange red wires Primary Measure resistance Wi Primary winding Less than 0 5 ohm approximate W Secondary winding 90 ohms approximate E Filament winding 0 ohms 4 Measure resistance Wi Primary winding to grounding Normal Infinite E Filament winding to grounding Normal Infinite Secondary white wire ground
8. resistance 4 W Normal 20 2 ohms n W Abnormal Infinite AC Line Filter 1 Unplug microwave oven or disconnect power 2 Remove wire leads 1 2 3 Measure resistance W Normal 1 3 coil Less than 1 ohm 2 4 coil Less than 1 ohm 3 LE 3 4 resistor 550k 800k ohms 3 4 E Abnormal Infinite CS e 47 Thermostats NOTE Refer to Parts Layout for opening and closing temperatures 1 Unplug microwave oven or disconnect power S FC Thermostats 2 Remove wire leads Cavity Thermostats 3 Measure continuity N Magnetron Thermostat W Normal Continuity W Abnormal Infinite 11 W10268748A 461965199813 6 09 2009 All rights reserved FOR SERVICE TECHNICIAN S USE ONLY
9. Filler Thermostat2 20 Amp o o re 1 Relay 1 MEN M hi tat i N s 5 BK BK oo 1 PUTA FC Heater 4904 M em Filter Primary Moni p 0 0 1 o Interlock onitor L Secondary Switch Interlock Interlock Switch Switch FC Motor and Thermal Actuator Circuit Cavity Fuse Filter Thermostat2 20 Amp EC Motor BK BK BK BK w o p 0 6 Electronic Control rimary z Ro eol e e Interlock Monitor Valve Relay i Switch Interlock e Filter N P5lo o Pp21lo vielle W 5 BUg Thermal Secondary Interlock Actuator Switch Hood Exhaust Fan on High Automatically Electronic Control 3 Cavity Fuse a Cavity L Filter Thermostat 2 20 Amp LV Thermostat 1 Transformer P5 4 p BK SS BK JS BR sy T 521 BU PS BU e y 8BU W BU HF Triac gt 7104 P33 BK BK P6 1 _ HF Relay HF Relay su gu HF 2 N 4922 4902 ir Y Y L p L AR R y 4 i VE J Motor Capacitor P6 5 Hood Thermistor oa Hood Exhaust Fan on Low Speed Manually Tug 04 Electronic Control Cavity Fuse 4 Cavity i Filter Thermostat 2 20 Amp se Thermostat 1 5 4 BK BK KY BK amp BR p24 Le BU
10. Tech Sheet Do not discard AWARNING Electrical Shock Hazard Disconnect power before servicing Replace all parts and panels before operating Failure to do so can result in death or electrical shock a b PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY Do not operate or allow the oven to be operated with the door open Make the following safety checks on all ovens to be serviced before activating the magnetron or other microwave source and make repairs as necessary 1 Interlock Operation 2 Proper Door Closing 3 Seal and Sealing Surfaces Arcing Wear and Other Damage 4 Damage to or Loosening of Hinges and Latches 5 Evidence of Dropping or Abuse Before turning on microwave power for any service test or inspection within the microwave generating compartments check the magnetron waveguide or transmission line and cavity for proper alignment integrity and connections d Any defective or misadjusted components in the interlock monitor door seal and microwave generation and transmission systems shall be repaired replaced or adjusted by procedures described in service manual before the oven is 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 Do not attempt to operate the oven i
11. ance across pins 1 amp 3 and across pins 2 amp 3 W Normal 2 8k ohms approximate at 77 F 28 C 18 F 10 C W Abnormal Infinite Resistor Hood Exhaust Fan Motor E Unplug microwave oven or disconnect power 2 Remove wire leads 3 Measure resistance W High Speed Normal Red R and Blue BU wires 80 ohms approximate Blue BU and Black BK wires 35 ohms approximate Abnormal Infinite W Low Speed Normal Red R and Blue BU wires 80 ohms approximate Blue BU and White W wires 60 ohms approximate Abnormal Infinite Hood Thermistor 1 If NTC SHORT CALL FOR SERVICE or NTC OPEN CALL FOR SERVICE Scrolls on display unplug microwave oven or disconnect power 2 Measure resistance W Normal 10k ohms 5 at 77 F 25 W Abnormal Infinite continuity E Unplug microwave oven or disconnect power 2 Remove wire leads 3 Measure resistance W Normal 9 3 ohms W Abnormal Infinite FC Thermistor Unplug microwave oven or disconnect power 2 Remove wire leads 3 Measure resistance Wi Normal 230k 20 ohm at 77 F 25 W Abnormal Infinite Unplug microwave oven disconnect power 2 Remove wire leads 3 Measure resistance W Normal 1 2k 0 5k ohms W Abnormal Infinite FC Thermoactuator FC Motor 1 Unplug microwave oven or disconnect power 2 Remove wire leads 5 f 3 Measure
12. ch Check By Door Open Door Closed Primary 1 Unplug microwave oven or disconnect power Interlock 2 Disconnect the wires at the Primary Interlock Switch 3 Check from the common terminal black brown wires to the normally open terminal black white wires 1 Unplug microwave oven or disconnect power 2 Disconnect the wires at the Primary Interlock Switch 3 Check from the common terminal black brown wires to the normally closed terminal orange wire Secondary 1 Unplug microwave oven or disconnect power Interlock 2 Disconnect the wires at the Secondary Interlock Switch 3 Check from the common terminal blue white wires to the normally open terminal blue red wires Primary Secondary and Monitor Interlock Switch Checkout Procedures Switch Check By DoorOpen Door Closed Monitor 1 Unplug microwave oven or disconnect power Interlock 2 Disconnect the wires at the Monitor Interlock Switch 3 Check from the common terminal white white wires to the normally closed terminal blue white wires Continuity No Continuity NOTE These diagrams are not intended to show a complete circuit they represent the position of switches during DOOR OPEN or DOOR CLOSED continuity checks only Door Closed Door Open L NC NO L ne NO NO N No NC NO Primar Monitor Secondary Primar Monitor Secondary Interloc Interlock Interlock Interloc Interlock Interlock Switch Switch Switch
13. f the door glass is broken W10268748A 461965199813 FOR SERVICE TECHNICIAN S USE ONLY WIRING DIAGRAMS LT eueN Jojoeuuot 3 10JOW agen A9 ueald ugy ysneyxy ON Ul SIA U9910 MOIISA A MOJ 9 10109 SM uo peu S9 0N Joqui S ug na eng M 8 14617 dopjoo9 an Ae 1010 94 uedo 0 Q 4 1 660 NW ON v06 6 Jeuoysuell Her eter 016 06v feu K A ej y 94 SAEA AT JosueS Id oun MW 1 1 oe ypiung D n B 2 ejay e 51 906b g a h 10SU8S 24 i lz asn4 Th ES led vi LS Joisiuueu DES vgod d 1019 RI E Q os 8 amp gia M c jm a gt E 5 eum 9 gt ss rs ao 2 EE gt z yesoway 1 SIS H Kneg 49414 eur Ov Jeuuojsuel of T 1904 a ga 9 e dX 9 9 0 9 9 euw gt yong x ya ya i epoid rae d 1 Au uv 0c amp asn4 Joyoedeo L G FSd qe 9 2 9 1 gt SS 1
14. former P5 4 BR 59 4 par EU BU e W PAR w T Cavity Fuse L Thermostat 2 20 Amp OR P2 7 BK Filter BK BK d CL Relay b o 4901 GY w BU Primary 0 6 2 3 e Interlock jc mites c matchs s T Switch Cavity Light Cooktop Light on High Electronic Control Cavity Fuse WC T Y Cavity L Filter Thermostat 2 20 Amp i Thermostat 1 Filter N Transformer P5 4 LEK d BK e BR p24 po BU BU WoW BUT w 1 1 HL Relay 4911 y P5 p 2 6 1 Hood Cooktop Cc ca Light Cooktop Light on Low Night Light Electronic Control Cavity Fuse KI dcc Cavity L Fi Thermostat 2 20 Amp LV Thermostat 1 pi ii BK BK BK BK BR Transformer B 5 4 BU Bi Wer S 6 NP 2 4 2 1 U e w W i HLRelay Diode 4912 6101 Y P5 5 R 2 0 0 D 6 1 Hood Cooktop Light N Touch Panel and Electronic Control Test The microwave hood combination is provided with a self diagnostic routine that can be accessed through the touch keypad To initiate this routine 1 Press and hold the STOP CLEAR button while opening the door 2 While still holding the STOP CLEAR button unplug the microwave oven for 2 seconds then plug it back in All VFD segments will be lit to indicate the test mode has been entered 3 Release the STOP CLEAR button and close the door NOTE When the door is closed
15. ity temperature sensor connection Replace the cavity temperature sensor Replace all parts and panels before operating Plug in microwave oven or reconnect power If problem persists unplug microwave oven or disconnect power Replace electronic control Replace all parts and panels before operating Plug in microwave oven or reconnect power F3H Humidity sensor failure COND APON Unplug microwave oven or disconnect power Connect a new humidity sensor to the electronic control at P1 Replace all parts and panels before operating Plug in microwave oven or reconnect power If no failure code appears when starting sensor function unplug microwave oven or disconnect power Replace humidity sensor Replace all parts and panels before operating Plug in microwave oven or reconnect power If failure code appears when starting sensor function unplug microwave oven or disconnect power Replace electronic control Replace all parts and panels before operating Plug in microwave oven or reconnect power F6 MW relay CHONDA Unplug microwave oven or disconnect power Check the cable to Relay 4903 Check to see if the relay 4903 on relay electronic control contact has welded closed Replace all parts and panels before operating Plug in microwave oven or reconnect power If problem persists unplug microwave oven or disconnect power Replace electronic control Replace all parts and panels
16. to transformer case Magnetron 1 Unplug microwave oven or disconnect power 2 Remove wire leads Check that the seal is in good condition 3 Measure resistance E Filament terminal Normal Less than 1 ohm 4 Measure resistance E Filament to chassis Normal Infinite 1 Unplug microwave oven or disconnect power 2 Remove wire leads 3 Measure resistance Wi Terminal to terminal Normal Momentarily indicates several ohms and then gradually returns to infinite W Terminal to case Normal Infinite H V Diode NOTE Some inexpensive meters may indicate infinite resistance in both directions 1 Unplug microwave oven or disconnect power LEM XS 2 Measure resistance W Forward Normal Continuity Abnormal Infinite W Reverse Normal Infinite Abnormal Continuity a Turntable Motor 1 Unplug microwave oven or disconnect power 2 Remove wire leads 3 Measure resistance W Normal 2 7k 3 8k ohms approximate W Abnormal Infinite Motor Capacitor 1 Unplug microwave oven or disconnect power 2 Remove wire leads A A 3 Measure resistance W Normal Momentarily 0 ohms then goes to infinite 10 W Abnormal Infinite Components Test Results Humidity Sensor Unplug microwave oven or disconnect power 2 Remove the 3 pin connector from the electronic control P1 W NOTE Do not remove the attached resistor which is used for internal resistance calibration BK 3 Measure resist
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