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SERVICE MANUAL R-2275 R-2285

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2. Ase 110001 rro dINYTNIAO 1001 89 9909dN YA LA 99094N ZHOS AO 2 0220V SL SH 9909dN 9d sa 11 LINN 704 409 32 R 2275 R 2285 o H3005N3 vl HOLSINHIHL NV3 98 2 jeued 6 6 911614 HL MS 4000 HOLSINHIHL Av T3u 39415 LINN MS 40022 180 96001 or TA 9608 GI 40022 089 MOWOO Y1SO 130 9602 IN EMS OL Fan E PN LINN MS Die eg va sg 100 11 099 ALt 098 99094 HE ved pers 2 298 S3eri ala A9 111070 04141 9346 LON 31 4 H SF 031419345 LON 41 0 2551 31519395 LON 31 4 Mv 269 27 954
3. SCHEMATIC CONDITION OF OVEN A00129V AO00L20V amp 0 H3ldlLO3H AH 31960 HOLIOWdW9 19 HOLIDVdVO zo e a R e e gt ri oars As LOIHISINWASV ieri E E 7 za 1 uw 1 1 p ct E m MAE 2 E d mE T des 6 uanuossNvul 14 U3WHOJSNVHL H3MOd ZL M02 0 MOZ 0L 30151534 HOLSIS3H JOHNS 3ouns HOLIMS LSNYHXA HOLIMS Y 1 4015 1 3ouns g 0 5 Oras AH QA Lm HIV va sg zg 1 58 HLISINHIHL 3ouns LIND 15 NI JOHINOD ng TT rav NE HINHOYSNVEL HOLON 1 40 2 zav N SO 2091 20991 T ES HINYOISNVYL 1n9 1N9 INSHYNO pool o Aron BL Ev 90091 p 3504 o VEIN 9snj YEIN 804 HOLIMS mu 201 HOLIMS HOLIMS AAA HOLVI ISI JONG HOLSIS3U HOLIMS HEMS gt ZMS ONON HOLINON 2 x _j A O o AOSZOV 120070 AOSZOV 17000 E gt 970 4089 S609 oo I MS OMOL NOISS3UddNS 3SION a 1 2 n 331113 3SION A0S2OV Goa ev AM LLI SL NYG 5i 21 0 ZHOS AOEZ 022 NOTE
4. Screw Driver Type LHSTIX DLR4 100T HIGH VOLTAGE COMPONENTS REMOVAL High Voltage Capacitor and High Voltage Rectifier Assembly To remove the components proceed as follows CAUTION 1 CARRY OUT 3D CHECKS 1 DONOTREPLACE ONLY HIGH VOLTAGE RECTI 2 Remove two 2 screws holding earth side terminals of FIER WHEN REPLACE IT REPLACE HIGH VOLT high voltage rectifier assemblies AGE RECTIFIER ASSEMBLY 3 Remove two 2 screws holding capacitor holder to 2 WHEN REPLACING HIGH VOLTAGE RECTIFIER oven cavity rear and remove the capacitor holder ASSEMBLY ENSURE THAT THE CATHODE 4 Disconnect all the leads and terminals of high voltage EARTH CONNECTION IS SECURELY FIXED TO rectifier assembly from high voltage capacitor THE CHASSIS WITH A EARTHING SCREW 5 Now high voltage rectifier assembly should be free 6 Remove the H V cover from the two 2 high voltage capacitors 7 Now the two 2 high voltage capacitors are free 22 R 2275 R 2285 MAGNETRON REMOVAL 1 CARRY OUT 3D CHECKS 2 Carry out item 2 to item 16 of HIGH VOLTAGE TRANS FORMER AND BLOWER MOTOR REMOVAL 3 Remove the four 4 screws holding the magnetron to the oven cavity Remove the magnetron from the oven cavity 4 Now the magnetron is free CAUTION WHEN REPLACE THE MAGNETRON BE SURE THE R F GASKET IS IN PLACE AND THE MAGNETRON MOUNTING SCREWS TIGHTENED SECURELY HIGH VOLTAGE T
5. MLG LSH S3EY SLO 20 SAP LIVLIG 820 2 OYDIN cod 120 Melt 09S S36HIVLO 666858 LO YOLOW W181 LAW P lesivsz a 20 o I o 1 AGE 110001 1 T 0 za NJAO MLZPDOL 91 80 9909d4N YA LA 9909d4N ZHOS 062 022 Me l SI SH 0909 90 sa 11 LINN TOHLNOO 33 R 2275 R 2285 pe SE Figure S 4 Printed Wiring Board 34 PARTS LIST R 2275 R 2285 Note The parts mark
6. 0 0 is approx 20 C Oven temp fuse 150 C This is not resetable type Above 150 C Closed circuit Thermal cut out 145 C Below 20 C Above 145 C Closed circuit Thermal cut out 115 C Below 20 C Above 115 C Closed circuit If incorrect readings are obtained replace the temp fuse or thermal cut out An open circuit oven temp fuse 150 C indicates that the oven cavity has over heated this may be due to no load operation An open circuit thermal cut out 145 C indicates that the magnetron has overheated this may be due to resistricted ventilation cooling fan failure or a fault condition within the magnetron or HV circuit An open circuit blower motor thermal cut out 115 C indicates the blower motor winding has overheated this may be due to resisted ventilation or locked cooling fan J MONITOR RESISTOR AND SURGE RESISTOR TEST CARRY OUT 3D CHECKS Disconnect the leads from the monitor resistor or surge resistor Using an ohmmeter and set on a low range Check between the terminals of the monitor resistor or surge resistor as described in the following table Table Resistance Resistor Resistance Monitor resistor Approx 4 30 Surge resistor Approx 100 If incorrect readings are obtained replace the monitor resistor or surge resistor CARRY OUT 4R CHECKS R 2275 R 2285 PROCEDURE LETTER K TEST PROCEDURES CONT D COMPONENT TEST SURGE RELAY TEST CARRY OUT 3D
7. 28 WIRING DIAGRAM T ee i Ada 29 PICTORIAL DIAGRAM EE Ne reed E ert ae eee en bred ud dre 31 CGONTROL PANELE CIRCUIT E dr ED HR a Pe 32 PRINTED WIRING BOARD 2 0 ciini enn nnde t ease ununi ia nnn ae 34 PARTS CIS T te varetekt duda 35 SHARP CORPORATION R 2275 R 2285 CAUTION MICROWAVE RADIATION Personnel should not be exposed to the microwave energy which may radiate from the magnetron or other microwave generating devices if it is improperly used or connected All input and output microwave connections waveguides flanges and gaskets must be secured Never operate the device without a microwave energy absorbing load attached Never look into an open waveguide or antenna while the device is energized VARNING MICKROVAGSSTRALING Personal f r inte uts ttas f r mikrov gsenergi som kan ustrala fr n magnetronen eller andre mikrov gsalstrande anordningar om dessa r felanslutna eller anv nds p fel s tt Alla in och utg ngsanslutningar f r mikrov gor vagledare fl nsar och packningar m ste vara fast anslutna Mikrov gsgeneratorn f r inte arbeta utan att absorberande belastning r ansluten Titta aldrig in i v gledare eller antenn n r mikrovagsgeneratorn r pakopplad eller laddad VAROITUS MIKROAALTOS
8. YINYOSSNVYL N3YYNO OPL HINYOISNVUYL 1NO 1 0 DN 201 80 0911 1utod y99M NM 112 TYNHIHL HOLON Samo 2 MOc v m 4 HOLSISIH HOLINON AO0L2OV AO01ZOV 31201 3170 HA HOLIDVdVO 19 HOLIDVdVO ZO e gt R P 591414993 L 314119384 OmL3ANASV omlannssv an I v kA 5 4 E 1 r es i AAR AN RS EAS EE E H3MOd 21 MOZC 0L MOZ 0L HOLSIS3H HOLSISSY 3ouns 3ouns HOLIMS usnvHxa 08 1 4018 HON ISAE SMS EMS 3ouns g a o Or 25 AH 2 el p HIV may 78 sa za eg ULSINHIHL i LINN 10 JOHINOO PAU WW d vev HINYOSISNVYL HOLON gs LA mt So 1 Iw zav NA MM 20891 HA A HINHOISNYEL 1nO1no 1nO1no INSHYNO JVNYSHL JVINH3HL OW 201 DN LOL T v 7 p 02091 Sel 80 o Yid eon 1N0 109 TYNLUIHL yoo HOLON H3MO 1H ABVINIHd HOLIMS a rat MOc v 151 151539 HOLIMS ae ZMS YO LINON HOLINON gt MS 2 x z LLI 3 gt A gt O e 190070 A
9. Weak point R 2285 Fuse R 2275 A017 M6 3A Fuse R 2275 M6 3A Special fuse R 2275 13A Fuse F6 3A 250V Thermal cut out Mag 145 C Thermal cut out Mag 145 C Thermal cut out Blower motor 115 C Oven temp fuse 150 C Thermistor Exhaust Approx 61 5kQ at 20 C 39 5KQ at 30 C Thermistor Air intake Approx 3 14kQ at 15 C 2 57KQ at 20 C 2 11KQ at 25 C Surge resistor 10Q 20W Surge resistor Monitor resistor 10Q 20W 4 30 20W Oven lamp 250V 25W Surge relay Approx 160 Surge relay Approx 160 High voltagr capacitor 1 07uF R 2285 0 94uF R 2275 AC 2100V High voltagr capacitor 1 07uF R 2285 0 94uF R 2275 AC 2100V High voltage transformer Filament winding lt 19 Secondary winding Approx 830 R 2285 980 R 2275 Primary winding Approx 1 30 R 2285 1 50 2275 High voltage transformer Filament winding lt 19 Secondary winding Approx 830 R 2285 980 R 2275 Primary winding Approx 1 30 R 2285 1 50 2275 Magnetron Filament winding lt 19 Filament winding chassis Magnetron In Out pit terminal Filament winding lt 19 Filament winding chassis TEST POINT ON CONTROL UNIT Test Point Resistance Disconnect the power plug and close the door Input terminal Power suplly Output terminal Stop switch
10. CAUTION DO NOT FORCE THE CONTROL UNIT TO SLIDE DOWN DURING REMOVAL THIS MAY CAUSE DAMAGE TO THE CONTROL UNIT BY HITTING A RELAY RY 3 OR THE TAB TERMINALS LOCATED AT THE FRONT OF THE OVEN CAVITY 2 If the Touch Control Panel is hard to remove 1 Insert a flat head screw driver into space B Fig 1 2 Rotate the screwdriver clockwise while holding position C of the Touch Control Panel Fig 2 CAUTION TO AVOID DAMEGE TO TOUCH CONTROL PANEL COVER THE TIP OF SCREWDRIVER WITH TAPE 3 Resolder the Relay RY 3 prior to reinstalling the Touch Control Panel Fig 1 TOUCH CONTROL PANEL SCREW DRIVER 21 R 2275 R 2285 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE WARNING Avoid possible exposure to microwave energy Please follow the instructions below before operating the oven 1 CARRY OUT 3D CHECKS 3 The door gasket or seal or damaged 2 Make sure that a definite click can be heard when the 4 The door is bent or warped microwave oven door is unlatched Hold the door 5 There are defective parts in the door interlock system closed position then pull the door release lever with one 6 There are defective parts in the microwave generating hand this causes the latch leads to rise it is then and transmission assembly possible to hear a click as the door switches operate 7 There is visible damage to the oven 3 Visually check the door and cavity face plate for damage
11. CARRY OUT 4R CHECKS MOTOR WINDING TEST CARRY OUT 3D CHECKS Disconnect the leads from the motor Using an ohmmeter check the resistance between the two terminals Resistance of Blower motor should be approximately 320 If incorrect readings are obtained replace the motor CARRY OUT 4R CHECKS 14 PROCEDURE LETTER N R 2275 R 2285 TEST PROCEDURES CONT D COMPONENT TEST NOISE FILTER TEST N E pau sj WHT CARRY OUT 3D CHECKS 5d Es Disconnect the leads from the terminals of a nl B noise filter Using an ohmmeter check be tween the terminals as described in the fol 0 lowing table Cx 20 Cy 20 1 0uF R 2285 0 22uF R 2275 4700pF MEASURING POINT INDICATION OF OHMMETER Between N and L Approx 680kQ Between terminal N and WHITW Short circuit Between terminal L and RED Short circuit If incorrect readings are absorbed replace the noise filter unit CARRY OUT 4R CHECKS TOUCH CONTROL PANEL ASSEMBLY TEST The touch control panel consists of circuits including semiconductors such as LSI etc Therefore unlike conventional microwave ovens proper maintenance cannot be performed with only a voltmeter and ohmmeter In this service manual the touch control panel assembly is divided into two units Control Unit and Switch Unit troubleshooting by unit replacement is described according to the symptoms indicated 1 Switch Unit The following sym
12. dents cracks signs of arcing etc Do not operate the oven 1 Without the RF gasket Magnetron Carry out any remedial work that is necessary before 2 If the wave guide or oven cavity are not intact operating the oven 3 If the door is not closed Do not operate the oven if any of the following conditions 4 If the outer case cabinet is not fitted exist 1 Door does not close firmly 2 Door hinge support or latch hook is damaged Please refer to OVEN PARTS CABINET PARTS DOOR PARTS when carrying out any of the following removal procedures OUTER CASE REMOVAL To remove the outer case proceed as follows CAUTION DISCHARGE HIGH VOLTAGE CAPACI 1 Disconnect oven from power supply TOR BEFORE TOUCHING ANY OVEN 2 Open the oven door and wedge it open COMPONENTS OR WIRING 3 Remove the two 2 screws from the lower portion of the i oven cabinet back side using by special screw drive Type LHSTIX DLR4 100T 4 Remove the nine 9 screws from rear and along the side edge of case 5 Slide the entire case back about 1 inch 3cm to free it from retaining clips on the cavity face plate 6 Lift the entire case from the oven 7 Removethe eleven 11 screws holdingthe rear cabinet to the oven 8 Remove the rear cabinet 9 Discharge the HV capacitor before carrying out any further work 10 Do not operate the oven with the outer case removed N B Step 1 2 and 9 form the basis of the 3D checks
13. fuse WP1 or WP2 when the high voltage rectifier is shorted The rated peak reverse voltage of D1 of the asymmetric rectifier is 6 KV The rated peak reverse voltage of D2 of the asymmetric rectifier is 1 7 KV D1 and D2 of the asymmetric rectifier or high voltage rectifier are shorted when the each peak reverse voltage goes beyond the each rated peak reverse voltage The process of the blowing the weak point fuse WP1 or WP2 1 The high voltage rectifier is shorted by any causes when microwave cooking 2 The peak reverse voltage of D2 of the rectifier goes beyond the rated peak reverse voltage 1 7 KV in the voltage doubler circuit ASYMMETRIC RECTIFIER HIGH VOLTAGE RECTIFIER 3 D2 of the rectifier is shorted 4 The large electric currents flow through the high voltage winding of the high voltage transformer 5 The large electric currents flow through the primary winding of the high voltage transformer 6 The weak point fuse WP1 or WP2 blows by the large electric currents 7 The power supplying to the high voltage transformer is cut off THERMISTOR EXHAUST The thermistor is a negative temperature coefficient type The temperature in the exhaust duct is detected through the resistance of the thermistor If the temperature rises about 120 C the control panel will display EE 7 and the oven will stop to avoid overheating and catching fire THERMISTOR AIR INTAKE This thermistor detects air flow
14. 01 peaj joeuuo NOLLNYD 831311938 OIBISINWASV AH NH 831311938 OIHISINWASV 3 d V 94 ISN 24 aad LLL 1NIOd MV3M aad 3Snd i LNIOd 3505 ASNYHXA HOLSINHIHL THM LILL HINYOSISNVYL HINYOISNYEL M18 INOHLSNDVA zon LOW SLINSNOdWOD 39V L1OA H9IH HOLIMS EMS LHM EN Ny dad ON HOLIMS 4015 SMS HOLIMS HOLVT ZMS LHM LHM HOLIMS HOLVT 151 gt IMS ON LHM WOO HOLIMS YOLINOW VMS ON YAYINI HIV HOLSINHIHL MIA NHD HNO eniq SI 40J08UU09 ay JO jnojoo poqeu TANVd JOHLNOD HONOL R 2275 R 2285 H3009N3 YOLSINYSH1L HOOT ORS LL MS 4000 T T 4 22 112419 jeued Z S HOLSINHSHL 3941 LINN MS 91 90022 180 96001 Im o pes 9608 N S 91 40022 089 7150 t49 9602 ES OL fat
15. TELY K ytt j ei saa joutua alttiiksi mikroaaltoenergialle jota voi s teill magnetronista tai muusta mikroaaltoja kehitt v st laitteesta jos sit k ytet n tai jos se kytket n v rin Kaikkien mikroaaltoliit nt jen seka sy tt ett ulostulopuolella aaltoputkien laippojen ja tiivisteiden tulee olla varmistettuja Mikroaaltouunnia ei koskaan saa k ytt ilman kuormaa jossa mikroaaltoenergiaa kuluu Avoimeen aaltoputkeen tai antenniin ei koskaan saa katsoa virran ollessa kytkettyn ADVARSEL MIKROB LGESTR LING Personell m ikke utsettes for mikrob lge energi som kan utst les fra magnetronen eller andre mikrob lge generende deler dersom apparatet feilbetjenes eller blir feiltikoplet Alle inn og ut tilkoplinger i forbindelse med mikrob lge str lingen b lgeledere flenser og tetningsringer pakninger m festes ordentlig Aldri bruk apparatet med mindre en mikrob lge absorberende last er plassert i ovnsrommet Aldri se direkte inn i en pen b lgeleder eller antenne imens apparatet er str mf rende ADVARSEL MIKROB LGEBESTR LING Man b r ikke uds tte sig for mikrob lgebestr ling fra magnetronen eller andre mikrob lgefrembringende anordninger hvilket kan ske hvis apparatet er forkert tilsluttet eller bruges forkert Alle mikrob lgeindgange og udgange b lgeledere flanger og t tningsstrimler m v re forsvarligt udf rt Anvend aldrig ovnen uden en mikrob lgesabsorberende anordning Se
16. voltage more than 250V 8 Mark Spare parts delivery section REF NO PARTNO s _pescriprion forv congj 53 S display tube Cushion 11 1 Capacitor 0 EZA192DRE Capacitor 10 EAB31 Capacitor 3 VC 11EX1 Capacitor VCEAB31 Capacitor KYD11CY1 Capacitor VCEAB31CW1 Capacitor VCEAB31 Capacitor VCKYD11HF1 Capacitor VCKYD11CY1 Capacitor VCKYD11HF1 Capacitor VCEAB31HW1 Capacitor VCEAB31 Capacitor VCEAB31 Capacitor uF VCKYD11CY103 Capacitor uF VCKYB11EX103 Capacitor 0 01 uF RC KZA129DREO Capacitor 22 pF RCRS AO010DREO Ceramic resonator CST4 00MGW DZAOO6CBEO Diode MPGO06G D1SS270A 1 Diode 1SS270A DZAOOGCBEO Diode MPGO06G DZAOOGCBEO Diode MPG06G D1SS270A 1 Diode 1SS270A uF 50V uF 35V uF uF uF uF uF uF uF uF uF uF uF NJ D1SS270A 1 Diode 1SS270A D1SS270A 1 Diode 1SS270A D1SS270A 1 Diode 1SS270A IZA539DREO SI VS2SB953 PQ 4 Transistor VS2SA1561TL 3 Transistor VSDTA143ES 1B Transistor VSDTA114YS 3 Transistor 143ES 3 Transistor 1 J lt lt lt lt lt lt 0 PPP OAR 258953 2SA1561TL DTA143ESXHZ DTA114YS DTD143ES D D B143ES A143ESXHZ k ohm 1 4W hm 1 2W hm 1 4W hm 1
17. 12mm XOTSD4 Screw 4mm x 12mm XWWSD4 Washer 4mm x XNESD3 Nut 3mm 2 4mm XCBWW3 Screw 3mm 8mm XBPSD4 Screw 4mm 10mm XOTSD4 Screw 4mm 12mm XBPSD3 Screw 3mm 28mm XWSSD4 Washer 4mm 1mm XEPSD3 Screw 3mm x 10mm LX BZA Special screw XFTSD4 Screw 4mm x 12mm XFPSD4 Screw 4mm x 6mm LX WZA Special washer X X X x x x 0 Hho VA BEE DAS BIG Ww HOW TO ORDER REPLAGEMENT PARTS To have your order filled promptly and correctly please furnish the following information 1 MODEL NUMBER 2 REF NO 3 PART NO 4 DESCRIPTION PACKING ADD KIT CPADBA164WRKO DOOR PROTECTION SHEET 27 OSPADP0336WREO REAR PAD SPADFA342WREO WRAP COVER OSSAKHO111WREO TRAY HOLDER SPADFA214WREO PACKING CASE n 2275 SPAKCC286WREO n 2285 SPAKCC285WREO 9 Not replaceable items PRINTED MATER INSTRUCTION BOOK 39 R 2275 R 2285 OVEN AND CABINET PARTS 40 R 2275 R 2285 41 R 2275 R 2285 SHARP 93 SHARP CORP 1251 30E Printed in Germany
18. A5 A7 B1 B2 Approx 6800 0 Output terminal Themistor B1 B3 Approx 61 5 at 20 C 39 5 at 30 C Output terminal Oven lamp Blower motor A1 A7 Approx 260 Output terminal Surge relay B4 B5 Approx 80 Output terminal Earth B1 Chassis 0 WARNING DISCONNECT THE PLUG WHEN MEASURING RESISTANCE 28 R 2275 R 2285 GLZZ H 10 440 1 0 NOHLINDVN LON A NOH I3NOVN ZON A H G 39194933 S G 22 H 10 UOI IPUOD NO ueAQ 2 0 911614 A NOHLINDVN LON A NOHL3NOVM Z N T A00LZOW AO012OV Aly6 0 31411934 H Q 3160 A H Q HOLIOVdVI 034 OIHLINNASV Old LAWWASY YAWHOSASNVYL H3MOd LL HIWNYOISNVYL H3MOd 21 MOZ OL YOLSISSY 3ouns ud HOLIMS HOLIMS LSNYHX3A YALSINYSHL IYVANI HIV YLSINYSHL HINYHOYSNVYL AN3YYND
19. aldrig ind i en ben b lgeleder eller antenne mens ovnen er i brug SERVICE MANUAL SHARP COMMERCIAL MICROWAVE OVEN R 2275 R 2285 GENERAL IMPORTANT INFORMATION This Manual has been prepared to provide Sharp Corp Service engineers with Operation and Service Information It is recommended that service engineers carefully study the entire text of this manual so they will be qualified to render satisfactory customer service WARNING Note The parts marked are used in volt age more than 250V Parts List Anm Delar market med har en spanning verstigande 250V Huom Huolto ohjeeseen merkitty t hdella osat joissa j nnite on yli 250 V Bemerk Deler som er merket asterisk er utsatt for spenninger over 250V til jord Bem rk Dele m rket med stjerne benyttes med h jere sp nding end 250 volt WARNING Never operate the oven until the following points are ensured A The door is tightly closed B The door latches and hinges are not defective C The door is not deformed or warped D There is not any other visible damage with the oven Servicing and repair work must be carried out only by trained service engineers Note The parts marked A on the parts list may cause undue microwave exposure by themselves or when they are damaged loosened or removed SHARP CORPORATION OSAKA JAPAN R 2285 PRODUCT SPECIFICATIONS GENERAL INFORMATION APPEARANCE V
20. defective parts or repair the wire harness CARRY OUT 4R CHECKS CAUTION Only replace weak point fuse with the correct value replacement 12 R 2275 R 2285 TEST PROCEDURES CONT D PROCEDURE LETTER COMPONENT TEST G SPECIAL FUSE WEAK POINT F1 TEST CARRY OUT 3D CHECKS If the special fuse weak point F1 is blown there could be a shorts or grounds in electrical parts or wire harness Check them and replace the defective parts or repair the wire harness CARRY OUT 4R CHECKS CAUTION Only replace special fuse weak point with the correct value replacement H FUSE F6 3A F2 TEST CARRY OUT 3D CHECKS If the fuse F2 F6 3A is blown when the door is opened check the latch switch monitor switch and monitor resistor If the fuse F2 F6 3 is blown by incorrect door switching replace the defective switch es and the fuse F2 F6 3A CARRY OUT 4R CHECKS CAUTION Only replace fuse with the correct value replacement TEMPERATURE FUSE OR THERMAL CUT OUT TEST CARRY OUT 3D CHECKS Disconnect the leads from the terminals of the temp fuse or thermal cut out Then using an ohmmeter make continuity test across the each two terminals as described in the table below CARRY OUT 4R CHECKS Table Temperature Fuse or Thermal Cut out Test Parts Name Temperature of ON condition closed circuit Temperature of OFF condition open circuit Indication of ohmmeter When room temperature
21. high voltage transformers T1 T2 are cut off when the 1st latch 2nd latch 3rd latch and stop switches SW1 SW2 SW3 SW5 are made open The blower motor BM and remains on even if the oven door is opened after the cooking cycle has been interrupted because the relay RY1 stays closed Shown in the display is the remaining time but the program is can celled if the oven is not started within 3 minutes 6 MONITOR SWITCH CIRCUIT The monitor switch SW4 is mechanically controlled by oven door and monitors the operation of the 1st latch switch SW1 6 1 When the oven door is opened during or after the cycle of a cooking program the 1st 2nd 3rd latch and stop switches SW1 SW2 SW3 SW5 must open their con tacts first After that the contacts of the monitor switch SW4 can be closed 6 2 When the oven door is closed the contacts of the monitor switch SW4 must be opened first After that the contacts COM NO of the 1st 2nd 3rd latch and stop switches SW1 SW2 SW3 SW5 must be closed 6 3 When the oven door is opened and the contacts of the 1st latch switch SW1 remain closed remains closed the fuse F2 F6 3A will blow because the monitor switch is closed and a short circuit is caused MICROWAVE VARIABLE COOKING When the microwave oven is preset for variable cooking power the line voltage is supplied to the high voltage transformers T1 T2 intermittently within a 32 second time base through the contacts o
22. in one direction and more than 100 kQ in the other direction CARRY OUT 4R CHECKS A B ASYMMETRIC RECTIFIER TEST ASYMMETRIC 2 CARRY OUT 3D CHECKS C HIGH VOLTAGE RECTIFIER R 2275 R 2285 PROCEDURE LETTER TEST PROCEDURES CONT D COMPONENT TEST Isolate the high voltage rectifier assembly from the HV circuit The asymmetric rectifier can be tested using an ohmmeter set to its highest range Contact the ohmmeter across the terminals A B of the asymmetric rectifier and note the reading obtained Reverse the meter leads and note this second reading If an open circuit is indicated in both directions then the asymmetric rectifier is good If an asymmetric rectifier is shorted in either direction then the asymmetric rectifier is probably faulty and must be replaced with high voltage rectifier When the asymmetric rectifier is defective check whether magnetron high voltage rectifier high voltage wire or filament winding of the high voltage transformer is shorted CARRY OUT 4R CHECKS NOTE FOR MEASUREMENT OF THE RESISTANCE OF THE RECTIFIER THE BATTERIES OF THE MEASURING INSTRUMENT MUST HAVE A VOLTAGE AT LEAST 6 VOLTS BECAUSE OTHERWISE AN INFINITE RESISTANCE MIGHT BE SHOWN IN BOTH DIRECTIONS HIGH VOLTAGE CAPACITOR TEST CARRY OUT 3D CHECKS A Isolate the high voltage capacitor from the circuit B Continuity check must be carried out with measuring instrument which is set to the highest resistance range C Anormal capacit
23. into P42 18 R 2275 R 2285 Pin No Signal I O Description 25 INT1 IN Signal coming from encoder Signal similar to R42 Pulse signals are input into INT1 26 INTO IN Signal synchronized with commercial power source fregency This is basic timing for all time processing of LSI end 27 RESET IN Auto clear terminal Signal is input to reset the LSI to the initial state when power is supplied Temporarily set to L level the moment power is supplied at this time the LSI is reset Thereafter set at level 28 29 P71 P70 OUT Terminal not used 30 XIN IN Internal clock oscillation frequency setting input The internal clock frequency is set by inserting the ceramic filter oscillation circuit with respect to XOUT terminal 31 XOUT OUT Internal clock oscillation frequency control output Output to control oscillation input of XIN 32 VSS IN Power source voltage 5V VC voltage of power source circuit input 33 P27 OUT Oven lamp and cooling fan motor driving signal Square Waveform 50Hz To turn on and off the shut off relay RY1 The 20 msec Square waveform voltage is delivered to the ARTE RY1 relay driving circuit and relays RY2 RY3 COOK RELAY control circuit ue 34 P26 OUT Terminal not used 35 36 P25 P24 OUT Magnetron high voltage circuit driving signal To turn on and off the c
24. to connect the supply after the outer case has been removed in this event carry out 3D checks and then disconnect the leads to the primary ofthe high voltage transformer Ensure that these leads remain isolated from other components and the oven chassis Use insulation tape if necessary When the testing is completed carry out 3D checks and reconnect the leads to the primary of the high voltage transformer When all service work is completed and the oven is fully assembled the microwave power output should be checked and microwave reakage test carried out TROUBLESHOOTING GUIDE IMPORTANT Ifthe oven becomes inoperative because of When troubleshooting the microwave oven it is helpful to a blown fuse F2 F6 3A in the 1stlatch switch follow the Sequence of Operation in performing the checks monitor switch monitor resisitor circuit Many of the possible causes of trouble will require that a check the 1st latch switch monitor switch specific test be performed These tests are given a proce and monitor resistor before replacing the dure letter which will be found inthe Test Procedure section fuse F2 F6 3A R 2275 R 2285 TEST PROCEDURE A POSSIBLE CAUSE AND DEFECTIVE PARTS H V RECTIFIER ASSEMBLY FOR MG1 H V RECTIFIER ASSEMBLY FOR MG2 H V WIRE HARNESS HIGH VOLTAGE TRANSFOMER T2 H V CAPACITOR C1 MAGNETRON 1 MAGNETRON MG2 HIGH VOLTAGE TRANSFOMER 1 H V CAPACITOR C2 1ST LATCH SWITCH SW1 2ND LATCH SW
25. 1 DOOR CLOSED 2 18 BUTTON TOUCHED HINYOYSNVEL 1n9 INSHYNO TVWNH3HL ON 201 100 HOLIMS HOLON H3MO 18 HOEN 01 HOLIMS HOT 0 16 INGA HOLSIS3U HOLIMS UMS Q MS HOLINON YOLINON YMS _ gt B AOSZOV 190070 AOSZOV 11270070 2 2 MG 0 4089 H ra MS OMOL NOISS3UddNS 3SION zzi 5 Y31714 3SION AOSZOV 1220 2 Nx SITAS O Er lt e SH NHB sima FEES 2 09 2 022 29 98 10 UONIPUOID 440 NOHLINDVN LON 9 1 BWSYIS 1 0 4 A NOHLINDVN ZON S 8822 10 uonipuo NO MOZ OL 30191534 39YNS A NOHLL3NDOVN LON A00L20V 3120 31411934 A H G 2 993114933 OIHLINNASV HIWNYOSSNVYL H3MOd 11 MOC OL YOLSISSY 3ouns ud HOLIMS 9 1 BWSYIS 2 0 4 4 A NOHLINDVN ZON 00129 312011 20 HINYHOYSNVHL HIMOd 21 LSNWHXxa
26. 2285 Heat up for 37 sec R 2275 HIGH VOLTAGE TRANSFORMER TEST WARNING High voltages and large currents are present at the secondary winding and filament winding transformer It is very dangerous to work near this part when the oven is on NEVER make any voltage measurements of the high voltage circuits including the magnetron filament CARRY OUT 3D CHECKS Disconnect the leads to the primary winding of the high voltage transformer Disconnect the filament and secondary winding connections from the rest of the HV circuitry Using an ohmmeter set on a low range it is possible to check the continuity of all three windings The following readings should be obtained R 2285 R 2275 a Primary winding approx 1 3 O approx 1 5 Q b Secondary winding approx 83 0 approx 98 Q c Filament winding less than 1 ohm If the reading obtained are not stated above then the high voltage transformer is probably faulty and should be replaced CARRY OUT 4R CHECKS HIGH VOLTAGE RECTIFIER ASSEMBLY TEST HIGH VOLTAGE RECTIFIER TEST CARRY OUT 3D CHECKS Isolate the high voltage rectifier assembly from the HV circuit The high voltage rectifier can be tested using an ohmmeter set to its highest range Connect the ohmmeter across the terminal B C of the high voltage rectifier and note the reading obtained Reverse the meter leads and note this second reading The normal resistance is infinity
27. 4W hm 1 2W hm 1 4W hm 1 4W hm 1 2W hm 1 4W hm 1 4W hm 1 4W hm 1 4W hm 1 4W hm 1 4W hm 1 4W hm 1 4W hm 1 4W hm 1 4W hm 1 4W hm 1 4W hm 1 4W hm 1W hm 1 4W hm 1 4W hm 1 4W 143ES 3 Transistor 143ES 1B Transistor EF182J Resistor 8 HF561J Resistor 56 EF102J Resistor 1 20 EF153J Resistor 15 HF150J Resistor 15 1530 Resistor 15k EFA71J Resistor 470 HF390J Resistor 39 EK202F Resistor 2 EK152F Resistor 1 5 EF102J Resistor 1 0 EF304J Resistor 300 EFA73J Resistor 47 EK472F Resistor 4 7 EK432F Resistor 4 3 EK303F Resistor 30 EK273F Resistor 27 EF332J Resistor 3 3 EF101J Resistor 100 EF512J Resistor 5 1k EFA73J Resistor 47k AA331J Resistor 330 EFA73J Resistor 47k EF332J Resistor 3 3 EF224J Resistor 220 RD B12EF472J Resistor 4 7 hm 1 4W RD B12bEF153J Resistor 15 hm 1 4W RLY A078DREO Relay OJ SH 118LM RLY A059DREO Relay VS14MB NR SH6 RALM A007DREO Buzzer PKM22EPT CA RTRNPAO80DREO Touch control transformer RTRN AO060DREO Current transformer RH VZAO34DREO Varistor 10G471K VHEHZ12C1 1 Zener diode HZ12C1 N 0 k k TANNIN NAA AA 000 0 0000 0 000 0 0 0 00 0 RD Bl RD B1 RS B1 RD B1 81 RD B1 PO N 20206 lt lt lt lt lt lt lt lt lt lt lt lt lt lt l
28. 87 x Vx AT t Our condition for water load is as follows Room temperature around 20 C Power supply Voltage Rated voltage Water load 1000g Initial temperature 10 2 C Heating time 23 sec R 2285 35 sec R 2275 P 180xAT R 2285 P 120xAT R 2275 Measuring condition 1 Container The water container must be a cylindrical borosilicate glass vessel having a maximum material thickness of 3 mm and an outside diameter of approximately 190 mm 2 Temperature of the oven and vessel The oven and the empty vessel are at ambient temperature prior to the start the test 3 Temperature of the water The initial temperature of the water is 10 2 C 4 Select the initial and final water temperature so that the maximum difference between the final water temperature and the ambient temperature is 5K Select stirring devices and measuring instruments in order to minimize addition or removal of heat The graduation of the thermometer must be scaled by 0 1 C at minimum and accurate thermometer The water load must be 1000 5 g t is measured while the microwave generator is operating at full power Magnetron filament heat up time is not included NOTE The operation time of the microwave oven is t 2 sec 2 sec is magnetron filament heat uptime Measuring method 1 Measure the initial temperature of the water before the water is added to the vessel Example The initial
29. CHECKS Disconnect the leads to terminals 1 and 6 connect an ohmmeter across the terminals 1 and 6 a reading of approximately 160 ohms should be indicated If this is not the case then the relay coil is probably faulty and the relay should be replaced CARRY OUT 4R TESTS 30 O5 Relay contact test for short circuit 10 COIL CARRY OUT CHECKS Isolate terminals 3 and 5 of the surge relay Using an ohmmeter check continuity between terminal 3 and 5 A reading of infinite resistance should be obtained If this is not the case then the relay is probably faulty and should be replaced CARRY OUT 4R CHECKS THERMISTOR EXHAUST TEST CARRY OUT 3D CHECKS Disconnect connector B from the CPU unit Measure the resistance of the thermistor with an ohmmeter Connect the ohmmeter leads to the leads of the thermistor Room etset 20 C 30 C Resistance eee Approx 61 5kQ 39 5kQ If the meter does not indicate above resistance replace the thermistor CARRY OUT 4R CHECKS THERMISTOR AIR INTAKE TEST CARRY OUT 3D CHECKS Disconnect connector H from the CPU unit Measure the resistance of the thermistor with an ohmmeter Connect the ohmmeter leads to the leads of the thermistor Room Temp Resistance 15 hud et Approx 3 14kQ 206 EE Approx 2 57kQ PM Approx 2 11kQ If the meter does not indicate above resistance replace the thermistor
30. EDURES COMPONENT TEST MAGNETRON TEST NEVER TOUCH ANY PART IN THE CIRCUIT WITH YOUR HAND OR AN INSULATED TOOL WHILE THE OVEN IS IN OPERATION CARRY OUT 3D CHECK Isolate the magnetron from high voltage circuit by removing all leads connected to filament terminal To test for an open circuit filament use an ohmmeter to make a continuity test between the magnetron filament terminals the meter should show a reading of less than 1 ohm To test for short filament to anode condition connect ohmmeter between one of the filament terminals and the case of the magnetron ground This test should be indicated an infinite resistance If a low or zero resistance reading is obtained then the magnetron should be replaced MICROWAVE OUTPUT POWER IEC 705 1988 The following test procedure should be carried out with the microwave oven in a fully assembled condition outer case fitted Microwave output power from the magnetron can be measured by way of IEC 705 i e it can be measured by using water load how much it can be absorbed by the water load To measure the microwave output power in the microwave oven the relation of calorie and watt is used When P W heating works for t second approximately P x t 4 187 calorie is generated On the other hand if the temperature of the water with V ml rises AT C during this microwave heating period the calorie of the water is V X AT The formula is as follows Pxt 4 187 W 4 1
31. G Before beginning the actual test for leakage proceed as follows 1 Make sure that the test instrument is operating normally as specified in its instruction booklet Important Survey instruments that comply with the requirement for instrumentations as prescribed by the performance standard for microwave ovens must be used for testing Recommended instruments are NARDA 8100 NARDA 8200 HOLADAY HI 1500 SIMPSON 380M Place the oven tray into the oven cavity Place the load of 275 15ml of water initially at 20 5 C in the centre of the oven tray The water container should be a low form of 600 ml beaker with inside diameter of approx 8 5cm and made of an electrically non conductive material such as glass or plastic The placing of this standard load in the oven is important not only to protect the oven but also to insure that any leakage is measured accurately Close the door and turn the oven ON with the timer set for several minutes If the water begins to boil before the survey is completed replace it with 275ml of cool water Move the probe slowly not faster that 2 5cm sec along the gap The microwave radiation emission should be measured at any point of 5cm or more from the external surface of the oven Microwave leakage measurement at 5 cm distance 27 R 2275 R 2285 Parts TEST DATA AT A GLANCE Value Data Weak point R 2285 A018 Weak point R 2285 A018
32. IEW OPERATING SEQUENCE FUNCTION OF IMPORTANT COMPONENTS SERVICING AND TROUBLESHOOTING CHART TEST PROCEDURE TOUCH CONTROL PANEL ASSEMBLY COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE MICROWAVE MEASUREMENT TEST DATA AT A GLANCE WIRING DIAGRAM PARTS LIST R 2275 R 2285 PRODUCT DESCRIPTION SPECIFICATION ITEM DESCRIPTION Power Requirements 220 230 Volts 50 Hertz Single phase 3 wire grounded Power Consumption 2 0 KW Approx 9A R 2275 2 7 KW Approx 13A R 2285 Power Output 1200 watts R 2275 1800 watts R 2285 nominal of RF microwave energy Method of IEC 705 Operating frequency of 2450MHz Outside Dimensions Width 510mm Height 335 mm including foot Depth 440 mm Cooking Cavity Dimensions Width 330 mm Height 210 mm Depth 330 mm Control Complement Touch Control System Microwave Power level 100 50 20 10 Microwave power setting key Electronic timer 0 30 min Start Key Set Weight Approx 30kg R 2275 Approx 32kg R 2285 GENERAL INFORMATION WARNING THIS APPLIANCE MUST BE EARTHED IMPORTANT HE WIRES IN THIS MAINS LEAD ARE COLOURED IN ACCORDANCE WITH THE FOLLOWING CODE GREEN AND YELLOW EARTH NEUTRAL LIVE R 2275 R 2285 APPEARANCE VIEW Control panel Stirrer cover Oven lamp Ceramic shelf Not removable Air intake filter Air intake
33. ITCH SW2 3RD LATCH SWITCH SW3 MONITOR SWITCH SW4 STOP SWITCH SW5 WEAK POINT FUSE WP1 WEAK POINT FUSE WP2 SPECIAL FUSE WEAK POINT 1 FUSE F6 3A F2 THERMAL CUT OUT 145 C TC1 THERMAL CUT OUT 145 C TC2 does not appear on display when power cord is plugged into wall outlet Control panel can not accept key in Fuse F2 F6 3A blows when the door is opened Home fuse browns when power cord is plugged into wall outlet Special fuse F1 browns when power cord is plugged into wall outlet Oven lamp and fan motor do not work for OFF 1 minute whenever the door is opened or CONDITION after cooking EE 7 appear in display EE 6 appear in display Fuse F2 F6 3A browns when power cord is plugged into wall outlet Oven lamp does not light when door is opened Blower motor works Blower motor does not work when dooris opened Oven lamp lights EE 1 appear in display EE 2 appear in display EE 3 appear in display EE 6 appear in display EE 7 appear in display EE 9 appear in display Both oven lamp and blower motor do not work Oven lamp does not work Blower motor do not work Oven does not stop after end of cooking cycle or when STOP CLEAR key is CONDITION lamp and blower motor stop Home fuse blows when starting the oven Oven goes into cook cycle but shuts down bef
34. OSZOV 1190070 ou a ru 90 1089 gt i Eo O i 30 q lt i OD 10 Y31714 3SION AOSZOV T O o E m 3 2 2 lt 7539 m 9 NH8 zi e og 5 9 2 lt 4 co 2 1 DOOR CLOSED 2 45 BUTTON TOUCHED 3 COOKING TIME ENTERED 4 START BUTTON TOUCHED HOLIMS YOLINOW YMS HO1VI UYILSINYIHL dae EMS HV HLSINYIHL NJAO 431714 3SION AOSZOV 1 700 0 AOSZOV 17000 MS 0 4089 AOS2OV ML HOLIMS MOOTH3LNI AYVNIHd HOLIMS HOLVT HLYVI SITAD 91 NH8 SL 2 09 062 022 99134938 OIHLINNASV LLO3H A 30 R 2275 R 2285 STON H1uv3 4809 Alddns H3MOd H1uvd valna LHM aad aad LHM 1NIOd MV3M do N 3snd 1519398 3SION 110 112 TYNHIVL YOLOW 601 LHM NE aad aad HOLSIS3Y JDUNS cH HOISIS3H HOLINON eH 8514 10 ureJDeiq S anly 1N0 1ND Ino 1nO TYNYIHL IVINH3H L SN OW 201 131908 NJAO LHM MIA 184005 JO oejuoo epis
35. PO Cushion 3 AA RPO Oven lamp cushion AC 0 Exhaust duct AL 0 Stirrer duct AV 0 Air duct A 0 Air guide AK AG PCLICO018WREO Clip L 1 AB IDHA048WRPO Air guide C R 2285 1 AE USUA303WREO Water proof cushion 2 AA 37 R 2275 R 2285 Note The parts marked A may cause undue microwave exposure The parts marked are used in voltage more than 250V 8 Mark Spare parts delivery section ___ __ 5 DESCRIPTION 191 cone FDAI AlG2WRTO PCUSGA045WRPO PZETEA047WRPO LANGQA372WRPO PCUSGO257WRPO MES plate Cushion Insulation sheet Thermal cut out angle Water cushion S PCUSUA268WRPO PCUSU0498WRP0 PCUSUO143YBPO PCUSUO333WRPO PCUSUO373WRPO DDORFA652WRKO FCOVAA053WRYO FDORFA2 62WRTO FHNDMAO06WRYO JHNDMAO31WRMO PGID 0024WRFO PGID 0025WRFO 1 64WRYO FLEVFA018WRYO 15 Frame cushion Water proof cushion Door cushion S Heat proof cushion Duct cushion DOOR PARTS assembly frame panel release lever handle Handle guide Handle spacer Joint plate Joint lever Latch head complete MLEVPA156WRFO MSPRCA074WREO Latch lever atch spring 217 LANGKA454WRP0 PPACGA125WRPO Choke cover Outside window fixing plate Door case packing PSPA A072WRPO PCUSGA057WRPO PCUSGA27 6WRPO PGLSPA354WREO PSHEPA428WREO Door spacer Handle cushion Door glass cushi
36. R HAS BEEN LOCKED Terminal Positive lock connector Lever Figure C 6 How to release the positive lock connector EXHAUST COVERS A AND B REMOVAL Exhaust cover A 1 Remove the single 1 special screw holding the exhaust cover A to the rear cabinet using the special driver LHSTIX DLR4 100T 2 Release the tab of the exhaust cover A from the hole of the rear cabinet and remove the exhaust cover A 3 Now the exhaust cover A is free Exhaust cover B 1 Remove the single 1 special screw holding the exhaust cover B to the rear cabinet using the special driver LHSTIX DLR4 100T 2 Release the tab of the exhaust cover B from the hole of the rear cabinet and remove the exhaust cover B 3 Now the exhaust cover A is free 26 SCREW DRIVER TYPE LHSTIX DLR4 100T gl i SPECIAL SCREW NOTE When securing or loosening the special screw LHSTIX DLR4 100T TYPE screw driver should be used R 2275 R 2285 MICROWAVE MEASUREMENT After adjustment of door latch switches monitor switch and door are completed individually or collectively the following leakage test must be performed with a survey instrument and it must be confirmed that the result meets the requirements of the performance standard for microwave oven REQUIREMENT The safety switch must prevent microwave radiation emis sion in excess of 5mW cr at any point bcm or more from external surface of the oven PREPARATION FOR TESTIN
37. RANSFORMER AND BLOWER MOTOR REMOVAL BLOWER MOTOR 1 CARRY OUT 3D CHECKS 2 Remove the single 1 screw holding the air duct A to the air duct Remove the air duct A Disconnect the wire leads from the blower motor and the blowe motor thermal cut out Remove the single 1 screw holding the blower motor to the oven cavity Release the HVC harness from the purse lock on the blower motor Remove the blower motor Now the blower motor is free 3 4 HIGH VOLTAGE TRANSFORMER 8 Remove the single 1 screw holding the air guide C to the ove cavity 9 Remove the air guide C from the oven cavity 10 Remove the single 1 screw holding the stirrer duct to the oven cavity 11 Remove the stirrer duct from the oven cavity 12 Disconnect the wire leads from the high voltage trans former 13 Disconnect the wire leads from the magnetron filament 14 Release the wire leads from the hook of the air duct 15 Remove the single 1 screw holding the air duct to the oven cavity 16 Remove the air duct from the oven cavity 17 Remove the two 2 screws holding the high voltage transformer to the bottom plate 18 Remove the high voltage transformer Now the high voltage transformer is free CAUTION WHEN THE NEW BLOWER MOTOR IS IN STALLED TWO PURSE LOCKS MUST BE FITTED IN IT BECAUSE IT DOES NOT HAVE ANY PURSE LOCKS CONTROL PANEL ASSEMBLY REMOVAL CONTROL ASSEMBLY 1 Disconnect the oven from the power suppl
38. SHARP SERVICE MANUAL R 2275 R 2285 SY307R2395H COMMERCIAL MICROWAVE OVEN MODELS R 2275 R 2285 In interests of user safety the oven should be restored to its original condition and only parts identical to those specified should be used TABLE OF CONTENTS Page CAUTION MICROWAVE 1 1 PRODUCT SPECIFICATIONS 1 etienne nnde kn Poen apa E AE EE San CE Ya Ra ur Ee XR Ran EAR RA annua 2 GENERAL IMPORTANT INFORMATION 2 3 APPEARANCE VIEW cnet ad R R ario aea e e Ta en 3 OPERATION SEQUENCE teet ode tei ete dete fa sd uka eed eta ciue advert e aia dia 4 FUNCTION OF IMPORTANT COMPONENTS en nennen 5 SERVIGIN ELE 7 TEST PROCEDURE vites rer ever eua n oen Er adr 10 TOUCH CONTROL PANEL ASSEMBLY aiaa E 17 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE 22 MICROWAVE MEASUREMENT 27 TEST DATAAT A GLANCE iic dettes ceret re KEERN EEE EAR AU
39. W MAO 95WRI 2nd latch switch AF QSW MAO 9 5WRI 3rd latch switch AF QSW MAO8 6WRI onitor switch AF QSW MAO8 5WRI top switch AF RI A404WRI igh voltage transformer R 2275 BQ A397WRI igh voltage transformer R 2285 BO A404WRI igh voltage transformer R 2275 BO A39 7WRI igh voltage transformer R 2285 BO A03 7WRI agnetron thermal cut out 145 C AG A037WRI agnetron thermal cut out 145 C AG A058WRI Blower motor thermal cut out 115 C AG FFS TAOO1WR Oven temp fuse 150 amp do C assembly AL 1 DH HZAO006WR Thermistor assembly AN 2 QACCVAO 60NWRI Power supply cord BG 3 QFSHDAO002WRI Fuse holder AF 4 QSOCLAO1 1WRI Oven lamp socket AH 5 FPWBFA213WRI Noise filter R 2275 AU 5 FPWBFA207WRI Noise filter R 2285 AW 6 FFILNAOO3WR Thermistor assembly Air intake AQ 7 RFIL A002WR FE Clamp R 2285 AP CABINET PARTS 1 PSHEGA003WRI Rubber sheet A AE 2 PSHEGAO 0 4WRI Rubber sheet B AE 3 FFTASA064W Oven lamp access cover assembly complete A 3 1 PREFHAO51W Lamp reflector AG 3 2 PCUSU0407W Cushion AA 4 GCABUAA425W Outer case cabinet BH 5 FCOVHAO31W Exhaust cover A AQ 6 PZETEA069NW Cabinet insulation sheet AF 7 FCOVAA054W Rear cabinet assembly AX 8 FCOVHA030W Exhaust cover B AG 1A 1B 1C 1D QCNCMA 38 1DRI QCNCMA3 3 8DRI OLUG A002PRI 5 pin connector 3 pin connector Tab terminal R 2275 R 2285 Note The parts marked A may cause undue microwave exposure The parts marked are used in
40. X X P J L R J J Ed Ed lt EP Qua 1 OSB WWW W UU Q p PP pp tij 00 N e Q ROR Pe PPP ee PP eR N N ps D 1 FGLSPAO21WRYO Ceramic shelf BD 2 FOVN A290WRYO Oven cavity assembly BV 3 PFILWAO51WRPO Oven lamp filter 1 4 EVPA153WRFO Switch lever A 1 AC 5 EVPA154WRFO Switch lever B 1 AC 6 EVPA155WRFO Switch lever C 1 7 SPRCAO75WREO Switch spring A 1 AB 8 SPRCAO7 6WREO Switch spring B AB 9 HOK A081WRFO Latch hook 1 AN 10 ANGQA251WRWO oise filter angle 1 11 HNG A216WRMO Lower oven hinge 1 T2 HNG A215WRMO Upper oven hinge 1 AG 13 COVPA019WRYO Stirrer cover assembly AS 14 FANMAO13WRYO Stirrer fan assembly AX 15 FIL A003WRKO Air intake filter assembly AU 16 DECEA002WRPO Decoration sash AS 17 1 4 6 Corner cap left AE 18 1 47 Corner cap right AE LANGQA370WRPO Oven lamp mounting plate AD GQ0382WRMO Earth angle AB RPO Capacitor holder AD RMO Fixing angle S AD RFO Air duct A 1 AG RPO Air guide E R 2275 1 AD RPO Fan cushion B 2 AB BEO Cord bushing AD RPO HV cover 1 AF RPO Radiator plate R 2285 1 AC RPO Orifice cushion AA RFO Water proof duct AN RPO Oven cushion 1 AB R
41. adjust the latch hook position After adjustment make sure of the following 1 The stop switch and 1st 2nd 3rd latch switches inter rupt the circuit before the door open when the door release lever is pulled and then and monitor switch close the circuit when the door is opened Re install outer case and check for microwave leakage around the door with an approved microwave survey meter Refer to Microwave Measurement Procedure Door release lever Latch head Monitor switch Latch hook 1st latch switch 2nd latch switch Latch lever Latch head 3rd latch switch Figure C 3 Latch Switch Adjustments R 2275 R 2285 DOOR REPLACEMENT AND ADJUSTMENT DOOR REPLACEMENT 1 CARRY OUT 3D CHECKS 2 Remove four 4 screws holding the upper and lower oven hinge to the oven cavity Remove door assembly with upper and lower oven hinges by pulling it forward On re installing new door assembly secure the upper and lower oven hinges with the four 4 mounting screws to the oven cavity Make sure the door is parallel with bottom line of the oven face plate and the latch head pass through the latch holes correctly CARRY OUT 48 CHECKS Note After any service to the door the approved microwave survey meter should be used to assure in compliance with proper microwave radiation stand ards Refer to Microwave Measurement Procedure 3 DOOR ADJUSTMENT When removing and or loose
42. around it When air intake filter is blocked by dust or blower motor is stalled an air flow reduces and the touch control panel shows FILTER on display To cancel FILTER indication touch the START pad SURGE RELAYS RY S1 AND RY S2 AND SURGE RESISTORS R1 AND R2 When the START key is touched the contacts of the surge relays RY S1 RY S2 close and the surge current flows through the surge resistors R1 R2 for 200 msec after 20 msec since the START key is touched the surge relays RY S1 RY S2 closes and supply the high voltage transformer with the line voltage After 200 msec the surge relays RY S1 RY S2 open their contacts and gets out of function The surge resistors R1 R2 lets the current peak current flow when the oven is switched on If surge resistors are defective the home fuse or circuit breaker may break down when the oven is switched on CAUTION THE SURGE RELAYS RY S1 RY S2 CLOSE FOR ONLY 200 MSEG JUST WHEN THE OVEN GETS RESTARTED BUT OPENS AGAIN WITHIN THIS 200 MSEC THE RELAYS RY 3 RY 4 MUST CLOSE BLOWER MOTOR BM The blower motor drives a blade which draws external cool air This cool air is directed through the air vanes surrounding the magnetrons and cools the magnetrons This air is chan nelled through the oven cavity to remove steam and vapours given off from the heating foods It isthen exhausted through the exhausting air vents at the oven cavity MG THERMAL CUT OUTS 145 TC1 TC2 These therma
43. cts problems in the magnetron high voltage circuit by sensing a variation in the current flowing through the primary winding of the high voltage transformer During heating the primary current of the high voltage transformers also flows through the primary winding of the current transformers CT1 and CT2 This causes a current to be induced in the secondary windings of CT1 CT2 and results in an AC voltage which is determined by R30 R31 This AC voltage is then half wave rectified by D30 D31 and smoothed filtered by C30 C31 This AC voltage is the input to the AN3 and AN4 ports of IC1 which determines if there is a magnetron high voltage problem HIGH VOLTAGE TRANSFORMER HIGH VOLTAGE CIRCUIT MAIN BODY SIDE SIDE F Lal oer oe o RY2 or RY3 p30 or 65 R31 R66 e C30 or C31 4 gt 1 1 AN3 030 2 032 e D31 083 ANZ PORT Si Ve Figure T 1 High Voltage Monitoring Circuit 13 Fan Lock Detecting Circuit This is a circuit for transmitting output change of ther mistor Fan Lock Sensor to IC1 2 Switch Unit The switch unit is composed of a matrix circuit in which when a switch it touched one of signals P43 P45 generated by the IC1 is passed through the switch and returned to the IC1 as one of signals P50 P51 3 Encoder The encoder converts
44. ed A may cause undue microwave exposure The parts marked are used in voltage more than 250V 8 Mark Spare parts delivery section REF NO PARTNO DESCRIPTION CODE ELECTRICAL PARTS DPWBFB193W DPWBFB197W QCNCMA308DRI QCNCMA31 6DRI QCNCMA03 9D CO NTROL PANEL PARTS Control unit R 2285 Control unit R 2275 4 pin connector 5 pin connector 3 pin connector FMOTEA215WR Blower motor assembly Class B BM RC QZA1 6 9WRI High voltage capacitor R 2275 AW RC QZA165WRI High voltage capacitor R 2285 AX RC QZA1 6 9WRI High voltage capacitor R 2275 AW RC QZA165WRI High voltage capacitor R 2285 AX FH DZA04 9WR HV rectifier assembly with HVC harness assembly AX QFS C001 9WRI Weak point R 2275 AE QFS CAO01 8WRI Weak point R 2285 AD QFS C001 9WRI Weak point R 2275 AE QFS CAO01 8WRI Weak point R 2285 AD OFS CAO009WRI Special fuse 13A R 2275 AF QFS CAO17WRI Weak point R 2285 AF 0 5 007 Fuse F6 3A AD RV MZA220WRI Magnetron R 2275 BK RV MZA193WRI Magnetron R 2285 BK RV MZA220WRI Magnetron R 2275 BK RV MZA193WRI Magnetron R 2285 BK RLMPTA02 8WRI Oven lamp AK RR WZA005WRI Surge resistor 10Q 20 W AG RR WZAOOS5WRI Surge resistor 10Q 20 W AG RR WZAO20WRI Monitor resistor 4 30 20W AF RRLY AO14WRI Surge relay AP RRLY AO14WRI Surge relay AP QSW MAO 95WRI lst latch switch AF QS
45. eferring to CHOKE COVER REMOVAL Release the oven hinges from the door panel Now the oven hinges are free DOOR HANDLE REMOVAL Remove the two 2 screws holding the door handle to door Remove the door handle from the door panel UPPER AND LOWER LATCH HEADS REMOVAL Remove the door release lever from the door assembly Remove the three 3 screws holding the joint plate to the door panel Release the latch spring from the tab of the joint lever and joint plate 10 Release the latch heads from joint lever and joint plate 11 Now the latch heads are free DOOR FRAME REMOVAL 12 Set the four 4 tabs of the door frame upright 13 Remove the door frame from the door panel Now door frame is free DOOR GLASS REMOVAL 14 Remove the four 4 screws holding the two 2 outside window fixing plates to the door panel 15 Now the door glass as free 2 3 4 9 R 2275 R 2285 HOW TO RELEASE THE POSITIVE LOCK CONNECTOR Procedure 1 Pushing the lever of positive lock conductor 2 Pull down the connector from the terminal 3 Now the connector is free Note If the positive lock has a insulation sleeve first remove it If you do not so you can not push the lever of positive lock CAUTION THE POSITIVE LOCK TERMINAL CAN NOT BE DISCONNECTED BY ONLY PULLING BE CAUSE ONCE YOU SERVICE PERSONAL HAVE CONNECTED THE POSITIVE LOCK CONNECTOR TO THE TERMINAL THE POSI TIVE LOCK CONNECTO
46. ened and 1st latch switch contacts are closed On opening the door each of these switches operate inversely 3 Ifthe door is opened and the 1st latch switch contacts fail to open the fuse F2 F6 3A blows simultaneously with closing of the monitor switch contacts CAUTION BEFORE REPLACING A BLOWN FUSE F2 F6 3A TEST THE 1ST LATCH SWITCH MONI TOR SWITCH AND MONITOR RESISTOR FOR PROPER OPERATION REFER TO CHAP TER TEST PROCEDURE MONITOR RESISTOR The monitor resistor prevents the fuse F2 F6 3A 250V bursting when the fuse F2 F6 3A 250V blows due to the operation of the monitor switch NOISE FILTER The noise filter assembly prevents radio frequency interfer ence that might flow back in the power circuit SPECIAL FUSE WEAK POINT F1 If the wire harness or electrical components are short circuited this special fuse weak point F1 blows to prevent an electric shock or fire hazard R 2275 R 2285 FUSE F6 3A 250V F2 1 If the wire harness or electrical components are short circuited this fuse blows to prevent an electric shock or fire hazard 2 The fuse also blows when 1st latch switch SW1 remains closed with the oven door open and when the monitor switch SW4 closes ASYMMETRIC RECTIFIER AND WEAK POINT FUSE WP1 WP2 The asymmetric rectifier is solid state device that prevents current flow is both directions And it prevents the tempera ture rise of the high voltage transformer by blowing the weak point
47. f the relays RY3 RY4 The following levels of microwaves power are given 32 sec ON 18 sec ON CS 50 8 sec ON 6 sec ON c Approx 20 Approx 10 NOTE The ON OFF time ratio does not exactly corre spond to the percentage of microwave power be cause approx 2 seconds are needed for heating up the magnetron filament TWO MAGNETRON OPERATION SYSTEM Two magnetrons MG1 MG2 are equipped in order to get higher microwave power output The primary windings of the high voltage transformers T1 T2 are connected so that each magnetron can be oscillated alternatively according to the frequency of the power supply Refer to the Figure 1 and 2 R 2275 R 2285 4 x N 3 T2 POWER TRANSFORMER N N I ASYMMETRIC RECTFIER ms 3 ASYMMETRIC Y RECTFIER E gt 14 9 9 14 C2 CAPACITOR AC 2100V D H V RECTIFIER D H V RECTIFIER C1 CAPACITOR AC 2100V MG2 MAGNETRON Y MG1 MAGNETRON Y Figure S 1 High Voltage Circuit T1 POWER TRANSFORMER COMMERCIAL FREQUENCY 50HZ POWER OUTPUT BY MAGNETRON 1 OPERATION OF MAGNETRON POWER OUTPUT BY MAGNETRON 2 Figure S 2 Operation of Magnetron FUNCTION OF IMPORTANT COMPONENTS DOOR OPEN MECHANISM 1 The door release lever is pu
48. from the switch 5 2 Push the retaining tabs outward slightly and then pull the switch forwards and remove it from the latch hook 6 For 1st latch and stop switches removal 6 1 Disconnect the wire leads from the 1st latch and stop switches 6 2 Remove the single 1 screw and nut holding the 1st latch and stop switches to the latch hook CAUTION WHEN THE 1ST LATCH SWITCH AND 2ND LATCH SWITCH ARE INSTALLED THETWO 2 TABS OF THELATCH HOOK SHOULD BE BROKEN 1ST 2ND 3RD LATCH SWITCH STOP SWITCH AND MONITOR SWITCH ADJUSTMENT In case 1st latch switch 2nd latch stop switch 3rd latch Switch and monitor switch do not operate properly due to a mis adjustment the following adjustment should be made Loosen the two 2 screws holding the latch hook With the door closed adjust latch hook by moving it back and forward or up and down In and out play of the door allowed by the latch hook should be less than 0 5mm The vertical position of the latch hook should be placed where the stop switch and 1st 2nd 3rd latch switches have activated with the door closed The horizontal position of the latch hook should be placed where the monitor switch has activated with the door closed Secure the screws with washers firmly Make sure of the 1st 2nd 3rd latch switches stop Switch and monitor switch operation If those switches have not activated with the door closed loose two 2 screws holding latch hook and
49. l cut outs protect the magnetrons against overheat If their temperature go up higher than 145 C because the blower motor is interrupted the ventilation openings are blocked the thermal cut outs TC1 TC2 will open and the line voltage to the high voltage transformer T1 T2 will be cut off and the operations of the magnetrons MG1 MG2 will be stopped The thermal cut outs TC1 TC2 will close their contacts again when their temperatures go down lower than 20 C BLOWER MOTOR THERMAL CUT OUT 115 C TC3 This thermal cut out protect the blower motor against over heat If its temperature goes up higher than 115 C because the blower motor is locked or the ventilation openings are blocked the contacts of the thermal cut out TC3 will open and the line voltage to the control unit will be cut off and the operation of the oven will be stopped The thermal cut out TC3 will be close its contacts again when its temperature goes down lower than 20 C OVEN TEMP FUSE 150 C TF This temp fuse protects the oven against overheat If the temperature goes up higher than 150 C because the food catches fire the contacts of temp fuse TF will open and the line voltage to the control unit will be cut off and the operation ofthe oven will be stopped The defective temp fuse mustbe replaced with a new rated one R 2275 R 2285 SERVICING WARNING TO SERVICE PERSONNEL Microwave ovens contain circuitry capable of producing very high voltage and current Con
50. lled 2 The upper latch head is lifted up by the linked door release lever The latch lever is lifted up by the door release lever The joint lever is lifted up by the latch lever The lower latch head is lifted up by the joint lever Now both latch heads are lifted up so they can be released from the latch hook OL 09 7 Now the door can be opened S Latch head Door release Monitor switch Latch hook 1st latch switch 2nd latch switch Latch lever Stop switch Latch head 3rd latch switch Figure D 1 Door Open Mechanism 1ST LATCH SWITCH SW1 2ND LATCH SWITCH SW2 3RD LATCH SWITCH SW3 AND STOP SWITCH SW5 1 When the oven door is closed the contacts COM NO must be closed 2 When the oven door is opened the contacts COM NO must be opened MONITOR SWITCH SW4 The monitor switch is activated the contacts opened the upper latch head and switch lever A while the door is closed The switch is intended to render the oven inoperative by means of blowing the fuse F2 F6 3A when the contacts of the 1st latch switch SW1 fail to open when the door is opened Function 1 When the door is opened the monitor switch SW4 contacts close to the ON condition due to their being normally closed At this time the 1st latch switch SW1 is in the OFF condition contacts open due to their being normally open contact switches 2 As the door goes to closed position the monitor switch contacts are op
51. ning hinges such as in door replacement the following adjustmentcriteria are taken Door is adjusted to meet the following three conditions by keeping screws of hinge loose 1 Adjustdoorlatch heads ata position where they smoothly catch the latch hook through the latch holes Refer to latch switch adjustments Deviation of the door alignment from horizontal line of cavity face plate is to be less than 1 0 mm The door is positioned with its face depressed toward the cavity face plate Reinstall outer case and check for microwave leakage around the door with an approved microwave survey meter Refer to Microwave Measurement Procedure OUTER CASE CABINET LATCH HEADS Figure C 4 Door Assembly Replacement and Adjustment CHOKE COVER REMOVAL 1 Insert an iron plate thickness of about 0 5 mm or flat type screw driver to the gap between the choke cover and door panel as shown figure to free the engaging part The protect sheet may be used not to damage the door panel 2 Lift up the choke cover now cove is free 25 FLATE TYPE SCREW DRIVER PROTECTION BY TAPE LOWER OVEN HING 4 COVER PANEL UPPER OVEN HING Figure C 5 Choke Cover Removal DOOR COMPONENTS REMOVAL Remove the door assembly referring to from item 1 through item 3 of DOOR REPLACEMENT 1 Place the door assembly on a soft cloth with facing up UPPER AND LOWER OVEN HINGE REMOVAL Remove the choke cover r
52. ocessed by one microcomputer 1 Power Supply Circuit This circuit changes output voltage at the secondary side of the low voltage T1 transformer to volatges required at each part by full wave rectifying circuit constant voltage circuit etc 2 ACL Circuit This is an Auto clear Circuit i e a reset circuit which enables IC1 to be activated from initial state 3 lt Power SYNC Signal Generating Circuit This is a circuit for generating power SYNC signal by virtue of the secondary side output of transformer T1 This signal is used for a basic frequency to time processing and so on Clock Circuit This is a circuit for controlling clock frequency required for operating IC1 4 5 1 1 Main Processor This is a one chip microcomputer responsible for con trolling the entire control unit 6 Display Circuit This is a circuit for driving display tubes by IC1 output 7 Switch Input Circuit This is a circuit for transmitting switch input information to IC1 8 Sound body Driving Circuit This is a circuit for driving sound body by IC1 output 9 Relay Driving Circuit This is a circuit for driving output relay by IC1 output 10 Stop Switch Circuit This is a circuit for driving IC1 to detect door opening closing 11 Exhaust Gas Temperature Detecting Circuit This is a circuit for transmitting output change of ther mistor Temperature Sensor to IC1 12 High Voltage Monitoring Circuit This circuit dete
53. on Door glass Inside film HBDGCA0 62WREO HBDGCAO61WREO TINSMA003WR TLABPAO34WR FW VZB254WRE FW VZB246WRE LHLDW0017YBE R 2275 R 2285 Sharp badge Sharp badge MISCELLANEOUS Operation manual Earth label Switch harness ain harness Wire saddle M R 2285 TCAUHA1 7 6WR I SPCNB959WR I SPCNB958WR TLABSOO57WR LABSAO54WR H caution label ame plate R 2275 ame plate R 2285 Fuse label M6 3A R 2275 Fuse label 10 R 2285 CAUHAO82WR l CAUHA083WR DWAO04BDE BSA008WR DWAO13JBE FPSD40P08K00 HTSD40P08RVO LX CZA057WREO XWWSD50 06000 XBPSD40 10000 Caution label Belgium label Purse lock with snap Fuse label F6 3A Cable clip Cord holder Purse lock I Purse lock I SCRERWS NUT AND WASHERS Screw 4mm x 8mm Screw 4mm x 8 mm Special screw Washer 5mm x 0 6mm Screw mm x 10mm LX CZ2A038WREO X EZA004WREO XBPSD50P12KS0 XOTWW40P10000 XFTSD40P08000 Special screw Special screw Screw 5mm x 1 Screw mm Screw mm XFPSD40P08000 XOTSF40P12000 XCPSD30P08X00 XJPSD40P10000 Screw mm Screw Screw Screw 38 R 2275 R 2285 Note The parts marked A may cause undue microwave exposure The parts marked are used in voltage more than 250V 8 Mark Spare parts delivery section EN EN XONSC4 4mm x 10mm XFPSD3 Screw 3mm x 10mm XOTSC4 Screw 4mm x
54. ook relay In10096 power level operation L level during cooking H level otherwise In other power level operation 50 20 0r10 H and L level is repeated according to power level OFF es POWER LEVEL ON OFF 50 32 sec 14 sec ON 20 8 sec 24 sec XS AM 10 6sec 26 sec mite 37 38 P23 P22 OUT Terminal not used 39 48 P21 P10 OUT Segment data signal The relation between signals and indicators are as follows Signal Segment Signal Segment P01 P15 f Pei e veo P21 1 dio ETR 20 2 1111 ene ve P17 PTT ten b PAG aee g PIO tie a 49 54 P07 P02 OUT Digit selection signal 201 21 2 The relation between digit signal digit are as follows Digit signal Digit 7 151 O 2nd POS 3rd 4 4th 5th 2 6th Normally one pulse is output in every B period Ies GND and input to the grid of the Fluorescent Display js 55 56 P01 P00 OUT Segment data signal Signal similar to P21 57 64 P37 P30 OUT Terminal not used R 2275 R 2285 19 SERVICING Precautions for Handling Electronic Components This unit uses CMOS LSI in the integral part of the circuits When handling these parts the following pre cautions should be strictly followed CMOS LSI have extremely high impedance at its input and output termi nals For this
55. openings Door CONTROL PANEL D 3 Lr 100 4 77 5096 5 ty 20 6 Ur 10 7 Door open handle Ventilation openings Oven lamp access cover Power supply cord DISPLAY AND INDICATORS Check indicators after the oven starts to confirm the oven is operating as desired 1 Cook indicator This indicator shows cooking in progress 2 Digital display 3 Microwave power level indicator OPERATING KEYS Power 100 Power 50 MICROWAVE POWER Power 20 LEVEL button Power 10 _ ELECTRONIC TIMER Rotate the knob to enter cooking time 9 START button R 2275 R 2285 OPERATION SEQUENCE OFF CONDITION Closing the door activates all door interlock switches 1st latch switch 2nd latch switch 3rd latch switch and stop switch IMPORTANT When the oven door is closed the monitor switch contacts COM NC must be open When the microwave oven is plugged in a wall outlet 220 230 volts 50Hz the line voltage is supplied to the point A5 A7 in the control panel Figure O 1 on page 29 or 30 1 The digital display shows NOTE When the door is opened or after cooking oven lamp and blower motor work for 1 minute MICROWAVE COOKING CONDITION Touch MICROWAVE POWER LEVEL button and enter a desired cooking time with the rotating ELECTRONIC TIMER And then touch START key Function sequence Figure O 2 on page 29
56. or 30 CONNECTED COMPONENTS RELAY Oven lamp Blower motor RY1 High voltage transformer T1 RY3 High voltage transformer T RY4 1 The line voltage is supplied to the primary winding of the high voltage transformer The voltage is converted to about 3 3 volts A C output on the filament winding and high voltage of approximately 2000 volts A C on the secondary winding 2 The filament winding voltage 3 3 volts heats the mag netron filament and the high voltage 2000 volts is sent to the voltagedoubling circuit where it is doubled to negative voltage of approximately 4000 volts D C 3 The 2450 MHz microwave energy produced in the magnetron generates a wave length of 12 24 cm This energy is channelled through the waveguide transport channel into the oven cavity where the food is placed to be cooked 4 When the cooking time is up a signal tone is heard and the relays RY3 RY4 go back to their home position The circuits to the high voltage transformers T1 T2 are cut off The relay RY1 remains and oven lamp and blower motor work for 1 minute 5 When the door is opened during a cook cycle the switches come to the following condition CONDITION DURING DOOR OPEN SWITCH CONTACT COOKING NO COOKING 1st latch switch COM NO Closed Open Monitor switch COM NC Open Closed 2nd latch switch _ COM NO Closed Open Stop switch COM NO Closed Open ard latch switch Closed Open The circuits to the
57. or shows continuity for a short time kick and then a resistance of about 10MQ after it has been charged D A short circuited capacitor shows continuity all the time E An open capacitor constantly shows a resistance about 10 MQ because of its internal 10MQ resistance F When the internal wire is opened in the high voltage capacitor shows an infinite resistance G The resistance across all the terminals and the chassis must be infinite when the capacitor is normal If incorrect reading are obtained the high voltage capacitor must be replaced CARRY OUT 4R CHECKS SWITCH TEST CARRY OUT 3D CHECKS Isolate the switch to be tested and using an ohmmeter check between the terminals as described in the following table Table Terminal Connection of Switch Plunger Operation COM to NO COM to NC Released O G S C Depressed S C O G COM Common terminal NO Normally open terminal NC Normally close terminal Short O C Open circuit If incorrect readings are obtained make the necessary switch adjustment or replace the switch CARRY OUT 4R CHECKS WEAK POINT FUSE WP1 OR WP2 TEST CARRY OUT 3D CHECKS If the weak point fuse WP1 or WP2 is blown there could be a short in the asymmetric rectifier or there is a ground in wire harness A short in the asymmetric rectifier may have occurred due to short or ground in H V rectifier magnetron high voltage transformer or H V wire Check them and replace the
58. ore end of cooking cycle Mi crowave power level is set at 10 Oven seems to be operating but no heat is produced in oven load Microwave power level is set at 10 It passed more than 1 minute after cook ing but oven lamp and blower motor go no working EE 8 appear in display EE 0 appear in display R 2275 R 2285 FHL ONILYVLS HIL4V SILNNIN Z NI 0 06 H3HDIH SI LSNYHX3 HOLSINHIHL 40 3univH3dW3lL 0 021 H3HOIH SI LSNVHXA HOLSINYHIHL 40 IYUNLVYUIdNIL MI01A3NNVYDOYUd OL ANG SNIMOOO AHL LATLANO TIVM LY H3MOd ON H3 V3u8 HO 3515 3INOH S3HOLIMS 40 INANLSNPAV SIN YOLOW H3MO 18 49340018 SSNIN3dO 340018 NH3 LIVd 1104 V AH 6 AV T3H TANVd HONOL SSANYVH HHIM Q3N3dO SSANYVH Q3 LHOHS H3q OH 9514 AlddNS 934115 3SION YOLOW OI O OO O O 133508 3MYLNI HIV HOLSIINH3H L LSNVHX3 HOLSINHIHL O c Au AV 13d 5 AV T3H 39405 HOLSIS3H HOLINON cd 18 HOLSISAY 5 41 9 091 ISNH IYNLVYIdNIL EOL LNO LND TYINYIHL R 2275 R 2285 PROCEDURE LETTER A TEST PROC
59. ptoms indicate a defective switch unit Replace the switch unit a When touching the select buttons a certain button produces no signal at all b When touching the select buttons sometimes a button produces no signal 2 Control Unit The following symptoms may indicate a defective control unit Replacing the control unit 2 1 Programming problems a When touching the select buttons a certain group of buttons do not produce a signal 2 2 Display problems a For a certain digit all or some segments do not light up Only one indicator does not light d The corresponding segments of all digits do not light up or they continue to light up e Wrong figure appears f A certain group of indicators do not light up 9 The figure of all digits flicker 2 3 Other possible problems caused by defective control unit a Buzzer does not sound or continues to sound b Cooking is not possible Note When defective components the Control Unit or Switch Unit are replaed the defective part or parts must be properly packed for return in the shipping carton with its cushion material in which the new replacement part was shipped to you SWITCH UNIT TEST 1 CARRY OUT 3D CHECKS 2 Remove the switch unit from the control panel referring to control panel removal 3 To test the switches SW1 SW5 on the switch unit check between the terminals of the connector CN F as described in the following table by using ohmmeter when the switches a
60. r source to the power input terminal of the touch control panel then itis possible to check and repair the controls of the touch control panel it is also possible to check the sensor related controls of the touch control panel by using the dummy resistor s Servicing Tools Tools required to service the touch control panel as sembly Soldering iron 30W It is recommended to use a soldering iron with a grounding terminal Oscilloscope Single beam frequency range DC 10MHz type or more advanced model Others Hand tools Other Precautions 1 Before turning on the power source of the control unit 19 e remove the aluminium foil applied for preventing static electricity Connect the connector of the key unitto the control unit being sure that the lead wires are not twisted After aluminium foil is removed be careful that abnor mal voltage due to static electricity etc is not applied to the input or output terminals Attach connectors electrolytic capacitors etc to PWB making sure that all connections are tight Be sure to use specified components where high preci sion is required R 2275 R 2285 SERVICE INFORMATION IMPORTANT When replace the magnetron MG1 and or MG2 the relays RY2 and RY3 on control unit must bereplaced at the same time CAUTION FOR TOUCH CONTROL PANEL REMOVAL 1 Hold the lower end Position A Fig 1 of the touch control panel ass y firmly while sliding it down and toward you
61. rcuit Output 5V in cooking only but apply high impedance to others to prevent thermistor from electrolytic corrosion ocurrence Terminal not used Surge limiting relay driving signal The surge limiting relay is designed to turn on 20 msec earlier than the cook relays RY2 RY3 P53 Terminal not used Signal coming from switch unit When either one of switches SW2 and SW4 on the switch unit is pressed a corresponding signal out of P44 and P43 will be input into P51 Signal similar to P51 When either one of switches SW1 SW3 and SW5 on the switch unit is pressed a corresponding signal out of P43 P44 and P45 will be input into P50 Signal to sound buzzer 942 396 This signal is to control the 2 5kHz A continuous signal 1 2 sec 1 2 sec A Switch touch sound Completion sound Terminal not used Switch strobe signal Signal is applied to the switch unit A pulse signal is input to P50 terminal while switch SW5 is pressed Switch strobe signal Signal is applied to the switch unit A pulse signal is input to P50 or P51 terminal while switch SW3 or SW4 is pressed Switch strobe signal Signal is applied to the switch unit A pulse signal is input to P50 or P51 terminal while switch SW1 or SW2 is pressed Signal coming from encoder When the encoder is turned the contacts of encoder make pulse signals And pulse signals are input
62. re released and depressed Switches Terminals Released Depressed SW1 F1 F4 SW2 F1 F5 SW3 F2 F4 Open Circuit S C Short Circuit R 2275 R 2285 PROCEDURE LETTER TEST PROCEDURES CONT D COMPONENT TEST 4 If incorrect readings are obtained replace the defective switch 5 CARRY OUT 4R CHECKS RELAY TEST CARRY OUT 3D CHECKS Remove the outer case and check voltage between Pin Nos 5 and 7 of the connector A on the control unit with an A C voltmeter The meter should indicate 220 230 volts if not check control unit circuity RY1 RY2 and RY3 Relay Test These relays are operated by D C voltage Check voltage at the relay coil with a D C voltmeter during the microwave cooking operation DC voltage indicated Defective relay DC voltage not indicated Check diode which is connected to the relay coil If diode is good control unit is defective RELAY SYMBOL OPERATIONAL VOLTAGE CONNECTED COMPONENTS RY1 APPROX 18 0V D C Oven lamp and Blower motor RY2 APPROX 17 5V D C Power transformer 1 RY3 APPROX 17 5V D C Power transformer 2 CARRY OUT 4R CHECKS PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING BOARD PWB IS OPEN To protect the electronic circuits this model is provided with a fine foil pattern added to the primary on the PWB this foil pattern acts as a fuse If
63. reason it is easily influenced by the surrounding high voltage power source static electric ity charge in clothes etc and sometimes it is not fully protected by the built in protection circuit In order to protect CMOS LSI When storing andtransporting thoroughly wrapthem in aluminium foil Also wrap all PW boards containing them in aluminium foil When soldering ground the technician as shown in the figure and use grounded soldering iron and work table approx 1M ohm Shapes of Electronic Components iD Transistor DTA114YS DTA143ESXHZ B B DTB143ES E 5 C DTD143ES Transistor Transistor c gt 258953 2SA1561TL Servicing of Touch Control Panel We describe the procedures to permit servicing of the touch control panel of the microwave oven and the precautions you must take when doing so To perform the servicing power to the touch control panel is avail able either from the power line of the oven itself or from an external power Source 1 Servicing the touch control panel with power sup ply of the oven CAUTION THE HIGH VOLTAGE TRANSFORMER OF THE MICROWAVE OVEN IS STILL LIVE DURING SERVICING PRESENTS A HAZ ARD Therefore when checking the performance ofthe touch control panel put the outer cabinet on the oven to avoid touching the high voltage transformer or unplug the primary terminal connector of the high voltage trans former to turn it off the end of such connector must be insula
64. t lt lt lt lt lt lt lt 4 36 R 2275 R 2285 Note The parts marked A may cause undue microwave exposure The parts marked are used in voltage more than 250V 8 Mark Spare parts delivery section REF NO PART NO DESCRIPTION CODE EHZ4C3 1 Zener diode HZ4C 3 LCB059WRKO Control panel frame with key unit assembly IADIAO67WRFE Display window DECAA196WRP Decorative metal fittings PNLCB155WRF Control panel GTA243WRW Control panel mounting angle PSD30P10XS Screw control unit mounting PSD40P1200 Screw control panel mounting angle mounting PSDAOPOSKO Screw decoration panel mounting for earth USUA303WRE Water proof cushion BKA510WR Knob GTA304WRP Rotary encoder mounting plate VR BAO16WR Rotary encoder BTN A895WR Select button BTN A896WR Start button DPWBFB195WRUO Switch unit assembly FW VZA165DREO ead wire harness 2 pin FW VZA166DREO ead wire harness 5 pin QSW PA025DREO act switch SW1 SW5 PCUSUA404WRP0 Select cushion PCUSGA401WRPO Cushion MSPRPA082WREO Spring PCUSUA407WRPO Water proof cushion B PCUSUA408WRPO Water proof cushion C PCUSUA40 6WRPO Water proof cushion A PSHEGA005WRPO Water proof sheet QW VZA122WREO Earth wire XEPSD30P08XS0 Screw 4mm x 8mm OVEN PARTS as E El AQ 1 WY D OTO OO Ou 0 VH F G H HE L XI
65. tact with following parts will result in electrocution High voltage capacitor High voltage transformer Magnetron High voltage rectifier assembly High voltage harness REMEMBER TO CHECK 3D REMEMBER TO CHECK 4R 1 Disconnect the supply 1 Reconnect all leads removed from components 2 Door opened and wedged open during testing 3 Discharge high voltage capacitor 2 Replace the outer case cabinet 3 Reconnect the supply WARNING AGAINST THE CHARGE OF THE 4 Run the oven Check all functions HIGH VOLTAGE CAPACITOR Microwave ovens should not be run empty To test for The high voltage capacitor remains charged the presence of microwave energy within a cavity place about 60 seconds after the oven has been a cup of cold water on the oven tray close the door and switched off Wait for 60 seconds and then short press Manual time Set key and set the microwave time circuit the connection of the high voltage capacitor for one 1 minute Set the power level to 100 and push thatis of the connecting lead of the high voltage the START button When the one minutes has elapsed rectifier against the chassis with the use of an timer at zero carefully check that the water is now hot insulated screwdriver If the water remains cold carry out 3D checks and re examine the connections to the component being tested Sharp recommend that wherever possible fault finding is carried out with the supply disconnected It may in Some cases be necessary
66. ted with an insulating tape After servicing be sure to replace the leads to their original locations A On some models the power supply cord between the touch control panel and the oven itself is so short that the two can t be separated For those models check and repair all the controls sensor related ones in cluded of the touch control panel while keeping it connected to the oven 20 B On some models the power supply cord between the touch control panel and the oven proper is long enough that they may be separated from each other For those models therefore it is possible to check and repair the controls of the touch control panel while keeping it apart from the oven proper in this case you must short both ends of the door sensing switch on PWB of the touch control panel with a jumper which brings about an operational state that is equivalent to the oven door being closed As for the sensor related controls of the touch control panel checking them is possible if dummy resistor s with resistance equal to that of the controls are used 2 Servicing the touch control panel with power supply from 2 3 5 an external power source Disconnect the touch control panel completely from the oven proper and short both ends of the door sensing switch on PWB of the touch control panel which brings about an operational state that is equivalent to the oven door being closed Connect an external powe
67. temperature T1 11 C 2 Add the 1 litre water to the vessel 3 Place the load on the centre of the shelf 4 Operate the microwave oven at HIGH for the temperature of the water rises by a value A T of 10 2 5 Stir the water to equalize temperature throughout the vessel Measure the final water temperature Example The final temperature T2 21 C 7 Calculate the microwave power output P in watts from above formula 10 PROCEDURE LETTER R 2275 R 2285 TEST PROCEDURES CONT D COMPONENT TEST Initial temperature vispes cel Re eoe e ee eee abl 1 11 Temperature after for R 2285 23 2 25 sec 2 21 Temperature after for R 2275 35 2 37 sec T2 21 Temperature difference 10 Measured output power The equation is P 180 x AT for R 2285 P 180 x 10 C 180 Watts The equation is P 120 x AT for R 2275 P 120 x 10 C 120 Watts JUDGMENT The measured output power should be at least 15 of the rated output power CAUTION 1 CORRESPONDS TO 180 WATTS FOR R 2285AND 120 WATTS FOR R 2275 REPEAT MEASUREMENT IF THE POWER IS INSUFFICIENT 1000g 10009 a ae Heat up for 25 sec
68. the foil pattern is open follow the troubleshooting guide given below for repair Problem POWER ON indicator does not light up CARRY OUT 3D CHECKS OCCURANCE The rated AC voltage is not present at POWER terminal of CPU connector CN A CAUSE OR CORRECTION Check supply voltage and oven power cord The rated AC voltage is present at primary Low voltage transformer or secondary circuit defective Check and repair Insert jumper wire J1 and solder CARRY OUT 3D CHECKS BEFORE REPAIR side of low voltage transformer Only pattern at a is broken Insert the coil RCILF2003YAZZ between c and d CARRY OUT 3D CHECKS BEFORE REPAIR Pattern at and are broken NOTE At the time of these repairs make a visual inspection of the varistor for burning dam age and examine the transformer with tester for the presence of layer short circuit check primary coil resistance If any abnormal condition is detected re place the defective parts IS IL CARRY OUT 4R CHECKS 1 16 R 2275 R 2285 TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOIUCH CONTROL PANEL The touch control section consists of the following units as shown in the touch control panel circuit 1 Control Unit 2 Key Unit The principal functions of these units and the signals com municated among them are explained below 1 Control Unit Signal of key touch and oven function control are all pr
69. the signal generated by IC1 into the pulse signal and the pulse signal is returned to the IC1 R 2275 R 2285 LSI IZA539DR DESCRIPTION OF LSI The signal of the LSI IZA539DR is detailed in the following table Signal Description VCC Connected to GND VEE Anode segment of Fluorescent Display light up voltage 35V Vp voltage of power source circuit input AVSS Reference voltage input terminal A reference voltage applied to the A D converter in the LSI Connected to VC 5V VREF Reference voltage input terminal A reference voltage applied to the A D converter in the LSI Connected to GND AN7 AN5 Terminal to switch the specification AN4 A D input for troubleshooting Magnetron 1 A D input for troubleshooting Magnetron 2 Temperature measurement input OVEN THERMISTOR By inputting DC voltage corresponding to the temperature detected by the thermistor this input is converted into temperature by the A D converter built into the LSI Temperature measurement input FAN LOCK THERMISTOR By inputting DC voltage corresponding to the temperature detected by the thermistor this input is converted into temperature by the A D converter built into the LSI Input signal which communicates the door open close information to LSI Door closed H level signal OV Door opened L level signal 5 0V Power supply output at thermistor detecting ci
70. ure C 1 Oven lamp socket 5 R 2275 R 2285 POWER SUPPLY CORD REPLACEMENT CARRY OUT 3D CHECKS Release the cord bushing from the rear cabinet Disconnect the brown and blue wires of the power supply cord from the noise filter Loosen the single 1 screw holding the earth angle and earth wire of power supply cord Remove the power supply cord Re install 1 2 1 2 Insert the power supply cord into the cord bushing Connect the brown and blue wires of power supply cord into the terminals of noise filter referring to pictorial diagram Insert the green yellow wire of power supply cord into the earth angle and tight the screw holding the earth angle Re install the cord bushing to the rear cabinet Re install the rear cabinet to oven cavity and the bottom plate with the eleven 11 screws and two 2 washers 6 CARRY OUT 4R CHECKS Cord bushing Powewr supply cord reen Yellow ire Rear cabinet Figure C 2 Power supply cord replacement 1ST LATCH 2ND LATCH 3RD LATCH MONITOR AND STOP SWITCHES REMOVAL CARRY OUT 3D CHECKS Remove the control panel from the oven cavity referring to CONTROL PANEL REMOVAL Remove the two 2 screws holding the latch hook to the oven cavity Open the door and pull the latch hook out of the oven cavity For 1st latch 2nd latch or Monitor switch removal 5 1 Disconnect the wire leads
71. y 2 Remove the air intake filter assembly from the bottom plate Remove two 2 screws holding the control panel mount ing angle to the bottom plate 4 Pull down the control panel 5 Disconnect connectors CN A CN B CN H and TAB terminal TAB1 2 3 and 4 from the control unit 6 Now the control panel assembly is free CONTROL UNIT 7 Disconnect connectors CN J and CN E from the control unit Remove six 6 screws holding the control unit to the control panel frame 3 8 9 Now the control unit is free SWITCH UNIT 10 Remove the three 3 screws holding the switch unit Main to the control panel frame 11 Remove the two 2 screws holding the switch unit Sub to the control panel frame 12 Now the switch unit is free ROTARY ENCODER 10 Remove the two 2 screws holding the earth wire to the rotary encoder and control panel mounting angle 11 Remove the two 2 screws holding the rotary encoder to the control panel frame 12 Remove the knob from the rotary encoder shaft 13 Now the rotary encoder is free OVEN LAMP SOCKET REMOVAL CARRY OUT 3D CHECKS Remove the oven lamp Pull the wire leads from the oven lamp socket by pushing the terminal hole of the oven lamp socket with the flat type small screw driver Lift up the oven lamp socket Now the oven lamp socket is free cR 23 Terminal Wire lead Flat type small Screw driver Terminal hole Fig

SERVICE MANUAL R-2275 R-2285

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