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SUPPLEMENTAL SERVICE MANUAL R-330AK R

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1. OLD NEW B OLD gt NEW OLD NEW D X REPLACEMENT PART alm EFFEC TIVE REF NO DESCRIPTION OLD No Q ty NEW No ABILITY FROM 1 8 Magnetron RV MZA197WREO 1 RV MZA267WRE A Jan 1997 1 14 Power transformer RTRN A508WREO 1 RTRN A525WRE A Feb 1997 12 15 sensor assembly FDTCTA173WRKO 1 FDTCTA176W D Jan 1997 2 1 Outer case cabinet R330AW GCABUA584WRTO 1 GCABUA608W A Jan 1997 2 4 Foot GLEGPAOO6WREO 1 GLEGPA023WRE A Dec 1996 2 4 Foot GLEGPA023WREO 1 GLEGPAO019WRE C Aug 1997 2 5 Leg GLEGPAO67WREO 1 0 671 Mis print 3 Control Panel Parts Refer to PARTS LIST on page 16 D Jan 1997 4 17 Cushion PCUSUA235WRPO 1 DELE D Jan 1997 4 19 Cushion PCUSUA278WRPO 1 DELE D 1997 4 20 MG air guide PGIDHAO58WRPO 1 DELE D Jan 1997 4 21 Cushion PPACGAO41WREO 1 PCUSGA399WRE C Jan 1997 4 23 Sensor mounting angle PCOVPA254WRPO 1 LANGTA338W D Jan 1997 4 24 Cushion ADD PCUSUA192W D Jan 1997 4 25 Cushion ADD PCUSUA329W D Jan 1997 5 Door assembly ADD CDORFA753W A Jan 1997 5 Door assembly R330AW ADD CDORFA755W A Jan 1997 5 9 Screw XCPSD40P06000 2 XCPSD40P08 C Jan 1997 5 10 Cushion ADD 1 PCUSUA481W C Aug 1996 5 11 Sc
2. 144905 4 100 119 MV MVOEE H 10 HOSN3S HV 30 310 R 330AK R 330AW LINN A3 8 O1V1Od NISSNW 12072 AVOLE SI 09H H3MOd 1509530 5 11 15 8 30822 194 30822 294 30822 594 30822 VOY 09 44066 799 199 40 2 2 5 4 0 2581 43144 348 LON dl 964 03149345 LON dl AA 310N S3evVIVIQ HOLIMS HOOG Ord 1 301 LZH 9 9 adeg YC8EZVZI MO3HO 029
3. COM AC HVT 3 RY1 N c K ss AC OL TTM FM Figure S 3 a Printed Wiring Board for 310 33 R 310AK R 330AK R 330AW gt gt e LD4 LD3 LD2 LD1 o 2 79 0 e N 34 310 R 330AK R 330AW PARTS LIST FOR R 310AK PARTNO CODE ELECTRIC 5 204 interlock switch door sensing switch and outer case switches Fuse holder Monitor fuse and monitor switch assembly Thermal cut out 125 deg Power supply cord High voltage rectifier assembly High voltage capacitor Magnetron Fan motor Oven lamp socket QSW MA110W QFSHDAOO09W 5 012 RTHM A078W FACCDA048W FH DZA075W RC QZA173W RV MZA197W RMOTEA338W QSOCLA021W RLMP TAO 3 0WRI Oven lamp RMOTDA1 61WRI Turntable motor RTHM A079W Thermal cut out 95 RTRN A508WRI Power transformer until September 1996 production RTRN A512WRI Power transformer from October 1996 production CABINET PARTS Outer case cabinet Bottom plate left Bottom plate right Foot Leg A gt
4. IT MOOTHALNI ON 5 HOLIMS 1 1 YOLINOW ATaVLNYNL HOLOW MVOLE Y LINN 1 HOIH oue m X00 1H3INI l O N 1601 HO LIMS AHVIWIHd pioo jddns uo yew pejoeuuoo V NO 15 LHM 241 LON m ___ ZH09 OW TWWYAHL HO LIMS ibn 10 8570 H31nO 15 941 p109 5 Jewod ueeq sey p100 jddns 1ewod JO eu an 49003 uo yew
5. 111 Li AV1dSIC WLSAYO 601 52 010 LLO 100 19 100 019 HOLIMS Hood uazzna 1NI 310 R 330AK R 330AW LINN NO 000 138 lisousaa 900 10 0010 HONOL 1508 avanw 8014 4018 N3HOLDI 9189 B 92 4110 0 Q3Id4IO3dS LON 41 191 698 566561 091519395 LON dl 91 044 OLV LOd H3NNIG 1 8 6 NAZOYS u 9H 968 031519395 LON 4 JSL 144 6 2 9 YOSNAS 4 L MOWOO PLSO E lt 3MSZ OLY 33081 601H 33006 8018 6 33029 2018 HOLIMS 9018 SS0LVUM Hood 220 43096 2019 06H 301 5019
6. 39 R 310AK R 330AK R 330AW PARTS LIST FOR R 330AK AW ELECTRIC PARTS 2nd interlock switch door sensing switch and outer case switches Fuse holder Monitor fuse and monitor switch assembly Thermal cut out 125 deg Power supply cord High voltage rectifier assembly High voltage capacitor Magnetron Fan motor Oven lamp socket Oven lamp urntable motor hermal cut out 95 deg Power transformer AH sensor assembly CABINET PARTS GCABUA581W Outer case cabinet R 330AK GCABUA584WRTO Outer case cabinet R 330AW GDAI A261WRWO Bottom plate left GDAI A286WRWO Bottom plate right GLEGPAO06WREO Foot GLEGPA067WREO Leg QSW MA110WR OFSHDAOO09WR FFS BAO12WR RTHM A078WR FACCDA048WR H DZAO75WR C QZA211WR V MZA197WR OTEA338WR SOCLA021WR A030WR OTDA161WR oan Dd Ed EX Bd Bd t 1 2 4 5 6 7 8 9 e 1 HM A079W RN A508W DTCTA173W L 2 Ed Ed Ed td NT C3 CO D J p gt gt D H o y y 231 21 23 23 lt CONTROL PANEL PARTS Control unit 2 connector 12 pin connector CN G 3 pin connector CN F Switch harness A SN A Switch harness SN B
7. j ddns y uo y pejoeuuoo WOO zAH ALON r3 MOO TH31NI 57 MVOLE Y L LINN AVI3H 390 1834NI ON WOO Pal o un 1de 5 15 eu M S 5 Jewod q ueeq sey Ajddns Jo 3019 9905s 1961 31ON uo n Q 0 pejoeuuoo snw DHO 10H ALON 134905 ANY 18 MV AVOEE Y 9 NO LINN TOHLNOO 100 112 TVINH3HL MV MVOEE H 10 HOSN3S HV N3AO 29 R 310AK R 330AK R 330AW 5 LHM m m WOO HOLIMS ADVLIOA a
8. 0 pejoeuuoo o9 eq ysnw am 10H THM LJ LINN ON U 134905 ANY NJAO no v MV MVOEE H 19 HOSN3S o 310 R 330AK R 330AW LD1 LD5 7 Q2 2SA933 05 06 5 4 7 C2 1000u 25v C1 0 1u 50v R3 910 1 2w TURNTABLE KRC243M 5 10u 85v w IF NOT SPECIFIED 1 4w 5 IF NOT SPECIFIED 1SS270A Figure S 2 a Power Unit Circuit R 310AK 310 R 330AK R 330AW LD1 LD2 LD3 LD4 LD5 97 9 9 9 9 LD1 LD5 R4 27 9 02 2581238 D5 06 5 4 7 Y C2 1000 35 C1 0 11 50v 0 1u 50v C4 10u 35v TURNTABLE OVENLAMP 1 Q3 KRC243M NOTE A NOT SPECIFIED 1 4w 5 IF NOT SPECIFIED 1SS270A Figure S 2 b Pow
9. L b P NNN P H ON Ol J O AANA 310 R 330AK R 330AW s RD B12bEF104J RD B12bEF105J RS B13AA331J LY A075DREO LY A076DREO Resistor 100k ohm 1 4W Resistor 1M ohm 1 4W Resistor 330 ohm 1W Relay OJE SS 124LM Relay OMIF S 124LM ALM A014DREO 2 H VZA034DREO HEHZ161 1 HEHZ5C2 1 Buzzer 22 Transformer Varistor 106471 Zener diode HZ16 1 Zener diode HZ5C2 HEHZ4A2 1 PNLCB262WRKO PNLCB263WRKO UNTKA784WREO TKA785WREO Zener diod HZ4A2 Control panel frame with key unit Control panel frame with key unit R 330AW Key unit R 330AW Key unit R 330AK HEPA585WREO sheet LD A164WRFO CDSA039DREO holder Rubber connector jiiquid crystal display S CNC A007WREO L B1 B028WRFO lt J J lt lt 4 Open button R 330AK BTN B029WRF0 SPRCA050WRE0 EPSD30P08XS0 LEVFA082WRE0 HOK A098WRFO HOK A095WRFO LBNDKAO 9 9WRWO FANJA029WREO UC A652WRPO FOVN A371WRTO LANGFA180WRWO LANGQA452WRPO LANGQA454WRPO Open button R 330AW Open button spring Screw 3mm x 8mm OVEN PARTS Actuater Switch holder Latch hook Capacitor holder Fan blade
10. uvaNooas 7 HOLIMS ON YOLOW YOLINOW 318V b AuVINIHd v O 57 2 O N qaq SIN3NOdNOO 39V L1OA mm ZAY X90 1H3INI pe WOO HO LIMS 3sna ddns uo ASVO woo LES pejoeuuoo LHM ul ALON 2 09 NH 91311999 MVOLE H LINN 1 YOLOW WN 18 1a HOLIMS qun dex asY9 YALNO 1snuu MeJos 941 M S Ajddns ueeq Aans en arra yeyoos uo UMA S MV MVOEE H 0 pejoeuuoo WOO LINN TOHLNOO LON HOLMS SNISN3S U
11. 08 11 0 029 INLOLVH 06 IWLOLVUM 020 91 11070 k GE rlo 129 91 11070 99 L 016 LY 581 43 NO 111 41111 121111 80 WLSAYO AINON 0 SO 91 11 vO tt 91 111070 O 0 ZO ty l LO YOLOW HOLON 318V 1 TOHLNOO 31 R 310AK R 330AK R 330AW 0 5 40 5 4 5 941614 A34 44066 coo 601 101 0004 vas WOOO 1808430 900 980001 LOH 1415 3997 1405 93 5014 YAWIL 4015 93A H 383 93A N3ZOH3 31nNIN N3HO LDI 49066 290 JOLVLOd ANNIG 9 H3MOd 20 4 1 9L 41100 03140346 LON 31 H 5 0 2881 44140348 LON 1 8195 090 966 03140346 LON 31 31ON 49066 190 1 2 1
12. cid 3066 LOEE 9014 5101 020 Hdzs2vzl 91 020 847704 5101 381 LEH H 919 ge vzan 0102 9 581 HOSN3S 002 NA NIA JAN IAN 9l tl 019 LLO X0L OL OL 083 MVLEOLWS2 AV1dSIQ WLSAYO 310 R 330AK R 330AW Figure S 4 Printed Wiring Board of Power Unit 310 R 330AK R 330AW PARTS LIST FOR CONTROL PANEL PART NO DESCRIPTION CODE CONTROL PANEL PARTS Power unit R 310AK Power unit R 330AK Power unit R 330AW 2 connector 9 connector Switch harness 5 Switch harness
13. gt OLD lt NEW OLD X NEW REPLACEMENT PART EFFEC TIVE DESCRIPTION OLD No Q ty NEW No ABILITY FROM Magnetron RV MZA197WREO 1 RV MZA271WREO A Jan 1997 Foot GLEGPA006WREO EGPA023WREO A Dec 1996 Foot GLEGPA023WREO 1 Aug 1997 Leg GLEGPA067WRE0 EGPA067WRF0 A Mis print Control Panel Parts Refer to PARTS L age 16 D Jan 1997 Cushion PCUSUA278WRP0 D Jan 1997 MG air guide PGGIDHA058WRP0 D Jan 1997 Cushion PPACGA041WREO CUSGA399WRE C Aug 1996 Door assembly ADD DORFA754WR A Jan 1997 Screw XCPSD40P060 XCPSD40P080 1997 Cushion ADD PCUSUA481WR C Aug 1996 Screw ADD XCPSD40P08W 1997 Turntble NTNT A079WRE NTNT A084WRE A Jan 1997 Instruction book TCADCA611WR TCADCA630WR G Jan 1997 XHTSD40PO8RVO 4 XHTSD40PO8RVO 3 1997 17 AND PARTS FOR R 310AK 310 R 330AK R 330AW 3 310 R 330AK R 330AW CAPACITOR lt R 310AK R 330AK R 330AW Interchangeability INFORMATION FOR PARTS CHANGING R 330AK AW
14. gt t O C No P lt U gt p gt J GCABUA582W GDAI A261W GDAI A286W GLEGPAO006W GLEGPA067W OOO CONTROL PANEL PARTS CPWBFA709W Control unit QCNCMA3 94 2 pin connector 057 12 connector CN G FW VZA195 Switch harness A SN A FW VZA1 Switch harness B SN B FW VZA1 Lead wire harness A RC KZA087 Capacitor 0 luF VCEAB31EW Capacitor 470uF VCKYD11CY Capacitor 0 01uF VCEAB31CW Capacitor 47uF RC KZA087D Capacitor VCKYD11CY1 Capacitor 01 VCEAB31HW1 Capacitor VCEAB31VW1 Capacitor VCKYD11CY1 Capacitor VCKYD11HB3 Capacitor VCKYD11CY1 Capacitor VCCCF61HH3 Capacitor RSRCDAO13DRI Diode bridge 155270 Diode 155270 VHD1SS270A Diode 155270 155270 155270 RH IZA738DRE LSI 512381 9 3 Light emitting diode VS2SA933S 3 Transistor 2SA933 VS2SB1238 3 Transistor 2SB1238 VSKRA101M 3 Transistor 01 VSKRC243M 3 Transistor 43 VSDTA143ES 1B Transistor 43ES VSKRA101M 3 Transistor 01 VRS B13AA911J Resistor hm VRD B12EF102d Resistor hm 1 4 VRD B12EF153d Resistor hm 1 4 VRD B12EF270d Resistor hm 1 4 VRD B12EF472d Resistor hm 1 4 VRD B12EF153d Resistor hm 1 4 VRD B12EF560d Resistor hm 1 4 VRD B12EF332d Resistor hm 1 4 VRD B12EF153d Resistor hm 1 4
15. 12 4720 Resistor hm 1 4 VRD B12FF153J Resistor hm 1 4 VRD B12FF224J Resistor hm 1 4 VRN B12EK103F Resistor k ohm 1 4 RRLY A021DRE0 Relay OJSH112LM UL RRLY A094DRE0 Relay OMIF S 112LM RALM AO14DREO Buzzer 22 RTRNPAO73DRE0 Transformer PCO OU CO uuv R R R R R R 7 7 R 3 3 p p PP p p p PP Pw O Q Ov iS 00 CO Ed FS Dp D UU D pops Ppp Pw pog Dp D D D psp Zum D D R 310AK R 330AK R 330AW NO 12 71 36 VZA032DREO Varistor 106471 EHZ4C3 1 Zener diode HZ4C 3 LCB264WRKO Control panel frame with key unit TKA786WREO Key unit HEPA585WREO ED sheet LD A164WRFO ED holder C A007WREO Rubber connector LCDSA038DREO0 jiiquid crystal display BTN B028WRFO Open button RCAO050WREO Open button spring EPSD30P08XS0 Screw 3mm x 8mm OVEN PARTS 00 gt 14 gt m P D gt Q Z EVFA082WREO Actuator OK A098WRFO Switch holder OK A095WRFO Latch hook DKAO99WRWO Capacitor holder ANJA029WREO Fan
16. 6 8 INSTRUCTION BOOK amp PRINTING MATTER Pad 6 2 TURNTABLE TRAY 6 1 TURNTABLE SUPPORT S TRAY PACK INTO THE OVEN CAVITY SPADFA397WRE0 Not replaceable items TOP PAD ASSEMBLY FPADBA341WRK0 PLASTIC BAG SSAKHA034WRE0 BOTTOM PAD ASSEMBLY FPADBA342WRKO PACKING CASE SPAKCC829WREO R 330AK SPAKCC832WREO R 330AW 45 R 310AK R 330AK R 330AW SHARP 96 SHARP CORP 8K4 150E Printed in U S A
17. 310 R 330AK R 330AW SHARP SUPPLEMENTAL SERVICE MANUAL 1702R330APK MICROWAVE OVEN MODELS R 310AK R 330AK R 330AW Inthe interest of user safety the oven should be restored to its original condition and only parts identical to those specified should be used This is a supplemental Service Manual for Models R 310A K R 330A K and R 330AW This supplemental service manual is mainly described the touch control panel parts information for the ovens from January 1997 production Use this supplemental manual together with the Base Model Service Manual Refer No is S8605R330APK for complete operation service information etc TABLE OF CONTENTS Page PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICE TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY INSIDE FRONT COVER BEFORE SERVICING essa e Endo Pee ka INSIDE FRONT COVER FOREWORD aut dev dea tata ahua r ut haya INSIDE FRONT COVER TEST PROCEDURE 1 TOUCH CONTROL PANEL ASSEMBLY u 3 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE sss enne 9 PICTORIAL DIAGRAM ETT 10 POWERIUNIT CIRCUIT Ep 11 1 61 cie Bug 13 PRINTED WIRING BOARD OF POWER nn 15 PARTS LISTs FOR CONTROL PANEL um u a ain Sua m 16 INFORMATION FOR PARTS CHANGING
18. l l S ll S 9 TEST PROCEDURE kuhusu 11 TOUCH CONTROL PANEL l D n RR E Ce RENE KR TERM 17 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE 20 24 PIG LORIALDIAGRAM e hh npe RR 29 CONEROL PANEL CIRCUIT 2 1 8 teu tee tha ent ea Hoe the eed eere teen 31 PRINTED WIRING BOARD 33 PARTSTLISIPPFORR 31OAK te 35 PACKING AND ACCESSORIES FOR 310 39 PARTS LIST FORR 330AK AM 40 PACKING AND ACCESSORIES FOR R 330AK AW n nana 45 SHARP ELECTRONICS CORPORATION Service Headquarters Sharp Plaza Mahwah New Jersey 07430 2135 310 R 330AK R 330AW PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY a b c 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 abus
19. Signal applied to touch key section A pulse signal is input to P20 P23 terminal while one of G6 line keys on key matrix is touched Key strobe signal Signal applied to touch key section A pulse signal is input to P20 P23 terminal while one of G5 line keys on key matrix is touched Signal to sound buzzer 2 0KHz A key touch sound B Completion sound P31 P32 Terminal not used P33 Key strobe signal Signal applied to touch key section A pulse signal is input to P20 P23 terminal while one of G4 line keys on key matrix is touched P34 Key strobe signal Signal applied to touch key section A pulse signal is input to P20 P23 terminal while one of G3 line keys on key matrix is touched Key strobe signal Signal applied to touch key section A pulse signal is input to P20 P23 terminal while one of G2 line keys on key matrix is touched 310 R 330AK R 330AW Description Key strobe signal Signal applied to touch key section A pulse signal is input to P20 P23 terminal while one of G1 line keys on key matrix is touched Terminal not used Power source voltage 5V VSS voltage of power source circuit input Power source voltage input terminal Standard voltage for LCD Connected to GND Common data signal COM4 Connected to LCD Pin No 1 COM2 Common data signal Connected to LCD Pin No 2 Common
20. 17 SHARP ELECTRONICS CORPORATION Service Headquarters Sharp Plaza Mahwah New Jersey 07430 2135 310 R 330AK R 330AW SERVICE MANUAL SHARP MICROWAVE OVEN R 310AK R 330AK R 330AW FOREWORD This Manual has been prepared to provide Sharp Electronics Corp Service Personnel with Operation and Service Information for the SHARP MICROWAVE OVENS R 310AK R 330AK R 330AW It is recommended that service personnel carefully study the entire text of this manual so that they will be qualified to render satisfactory customer service Check the interlock switches and the door seal carefully Special attention should be given to avoid electrical shock and microwave radiation hazard This supplemental service manual contains update information only Please refer to base model service manual Refer is S8605R330APK for complete service information PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY a Do not operate or allow the oven to be operated with the door open b 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 c Before turning on microwave powe
21. COMPONENT TEST TOUCH CONTROL PANEL ASSEMBLY TEST The touch control panel consists of circuits including semiconductors such as LSI ICs 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 Key Unit and also the Control Unit is divided into two units CPU Unit and Power Unit and troubleshooting by replacement is described according to the symptoms indicated 1 Key Unit Note Check key unit ribbon connection before replacement The following symptoms indicate a defective key unit Replace the key unit a When touching the pads a certain pad produces no signal at all b When touching a number pad two figures or more are displayed c When touching the pads sometimes a pad produces no signal 2 Control Unit The following symptoms indicate a defective control unit Before replacing the control unit perform the Key unit test Procedure to determine if control unit is faulty 2 1 In connection with pads a When touching the pads a certain group of pads do not produce a signal b When touching the pads no pads produce a signal 2 2 In connection with indicators a At a certain digit all or some segments do not light up b At a certain digit brightness is low c Only one indicator does not light d The corresponding segments of all digits do not light up o
22. Re install 1 Re install each switch in its place The secondary interlock monitor switches are in the lower position and the door sensing switch is in the upper position Re connect wire leads to each switch Refer to pictorial diagram Secure latch hook with two 2 mounting screws to oven flange Make sure that the monitor switch is operating properly and check continuity of the monitor circuit Refer to chapter Test Procedure and Adjustment procedure If the door sensing switch secondary interlock switch monitor switch do not operate properly due to a misadjustment the following adjustment should be made 1 2 Loosenthe two 2 screws holding latch hooktothe oven cavity front flange With door closed adjust latch hook by moving it back and forth and up and down In and out play of the door allowed by the upper and lower position of the latch hook should be less than 0 5mm The vertical position of the latch hook should be adjusted so that the door sensing switch and secondary interlock switch are activated with the door closed The horizontal position of the latch hook should be adjusted so that the plunger of the monitor switch is pressed with the door closed Secure the screws with washers firmly Check the operation of all switches If each switch has not activated with the door closed loosen screw and adjust the latch hook position After adjustment check the following 1 In and o
23. DOOR CLOSED COOKING TIME PROGRAMMED 2 3 VARIABLE COOKING CONTROL HIGH 4 START PAD TOUCHED CASE MONITOR THERMAL THERMAL SWITCH FUSE CUT OUT MG CUT OUT OVEN This Circuit is only for and R 330AW These outer case switches will be used from Oct 1996 production CONTROL UNIT POWER TRANSFORMER PRIMARY INTERLOCK AH SENSOR OVEN LAMP SECONDARY CASE SWITCH MONITOR o SWITCH RECTIFIER MAGNETRON Figure O 2 Oven Schematic Cooking Condition DESCRIPTION AND FUNCTION OF COMPONENTS DOOR OPEN MECHANISM The door is opened by pushing the open button on the control panel refer to the Figure D 1 Whenthe open button is pushed the open button pushes up the switch lever and then the switch lever pushes up the latch head The latch heads are moved upward and re leased from latch hook Now the door will open Door Sensing Switch Monitor Switch Secondary Interlock Switch Figure D 1 Door Open Mechanism DOOR SENSING AND SECONDARY INTERLOCK SWITCHES The secondary interlock switch is mounted in the lower position of the latch hook and the door sensing switch in the primary interlock system is mounted in the upper position of the latch hook They are activated by the latch heads on the door When the door is opened the switches interrupt the circuit to all components A
24. Fan duct Oven cavity Chassis support Partition angle MG thermo angle MLEVPA1 94WREO CPL A045WRFO PCUSGA385WRPO PCOVPA275WREO PCUSGA339WRPO Switch lever Coupling Cushion Waveguide cover Cushion O PCUSUA212WRPO PCUSUA235WRPO PCUSUA376WRPO PCUSUA278WRPO PGIDHA058WRPO Cushion Cushion Cushion Cushion MG air guide Poop gs go pop go 0 palus gs ga ga Dp Q l N r 0 Q PPACGA041WRE0 PPACGA084WRF0 PCOVPA254WRP0 FDORFA303WRTO PSHEPA382WREO GWAKPA4 4 6WRRO GWAKPA450WRRO HPNL A662WREO HPNL A663WRRO 370 PPA139WRF0 RTA084WRE0 Cushion TTM packing Air duct DOOR PARTS Door panel Sealer film Door frame R 330AK Door frame R 330AW Door screen R 330AK Door screen R 330AW Choke cover Latch head atch spring PPA162WRF0 XCPSD40P06000 FROLPA079WRK0 Door stopper Screw 4mm x 6mm MISCELLANEOUS Turntable support NTNT A079WREO FW VZB547WREO FW VZB572WREO QW QZA150WREO urntable tray Main wire harness until September 1996 production Main wire harness from October 1996 production High voltage wire B PZET A012WREO erminal insulator Dp 0 Q NN S 1 6 6WRRO TCAUAA200WRRO TCADCA610WRRO TSPCNC379WRRO DHHS caution label Monitor caution label Instruction book Rati
25. Internal clock oscillation frequency control output Output to control oscillation input of XIN Auto clear terminal Signal is input to reset the LSI to the initial state when power is supplied Temporarily set L level the moment power is supplied at this time the LSI is reset Thereafter set at H level Connected to GND Signal synchronized with commercial power source frequency Signal similar to VSS Common data signal Connected to LCD Pin No 1 Common data signal 2 Connected to LCD Pin No 2 R 310AK R 330AK R 330AW data signal COM1 Connected to LCD Pin No 3 Terminal not used Power source voltage input terminal Connected to GND ABSOLUTE HUMIDITY SENSOR CIRCUIT R 330AK AW 1 Structure of Absolute Humidity Sensor The absolute humidity sensor includes two thermistors as shown in the illustration One thermistor is housed in the closed vessel filled with dry air while another in the open vessel Each sensor is provided with the protective cover made of metal mesh to be protected from the external airflow Sensing part Open vessel Sensing part Closed vessel 2 Operational Principle of Absolute Humidity Sensor The figure below shows the basic structure of an absolute humidity sensor A bridge circuit is formed by two thermistors and two resistors R1 and The output of the bridge circuit is to
26. OUTLINE OF TOUCH CONTROL PANEL The touch control section consists of the following units as shown in the touch control panel circuit 1 Key Unit 2 Control Unit The principal functions of these units and the signals com municated among them are explained below Key Unit R 330AK AW The key unit is composed of a matrix signals generated in the LSI are sent to the key unit through P36 P35 P34 P33 P27 P26 P25 and P24 When a key pad is touched a signal is completed through the key unit and passed back to the LSI through P20 P23 to perform the function that was requested Key Unit R 310AK The key unit is composed of a matrix signals generated in the LSI are sent to the key unit through P73 P81 P82 P83 P90 and P91 When a key pad is touched a signal is completed through the key unit and passed back to the LSI through P60 P63 to perform the function that was requested Control Unit Control unit consists of LSI ACL circuit indicator circuit power source circuit relay circuit buzzer circuit synchro nizing signal circuit absolute humidity sensor circuit and back light circuit 1 ACL This circuit generates a signal which resets the LSI to the initial state when power is supplied 2 Indicator Circuit R 330AK AW This circuit consists of 25 segments and 4 common electrodes using a Liquid Crystal Display Indicator Circuit R 310AK This circuit consists of 12 segments and 3 common electrod
27. 330AW 1 The display will show 55552 5 THE L5 ri coo Eri JOCEC d HE mic aay LLEHR FN d PRESS rin LL LIL nje To setany program or clock you must first touch the STOP CLEAR pad The display will clear and will appear for R 310AK 1 The display will show flashing EE EE To set any program or the clock you must first touch the STOP CLEAR pad The display will clear and will appear COOKING CONDITION Program desired cooking time by touching the NUMBER pads Program the power level by touching the POWER LEVEL pad and then a Number pad When the START pad is touched the following operations occur 1 The contacts of relays are closed and components connected to the relays are turned on as follows For details refer to Figure O 2 RELAY CONNECTED COMPONENTS RY 1 oven lamp turntable motor fan motor RY 2 power transformer 2 120 volts A C is supplied to the primary winding of the power transformer and is converted to about 3 2 volts A C output on the filament winding and approximately 2150 volts A C on the high voltage winding 3 The filament winding voltage heats the magnetron filament and the H V winding voltage is sent to a voltage doubler circuit 4 The microwave energy produced by the magnetron is channelled through the waveguide into the cavity fe
28. 330AW FOREWORD This Manual has been prepared to provide Sharp Electronics Corp Service Personnel with Operation and Service Informa tion for the SHARP MICROWAVE OVENS R 310AK 330AK R 330AW It is recommended that service personnel carefully study the entire text of this manual so that they will be qualified to render satisfactory customer service Check the interlock switches and the door seal carefully Special attention should be given to avoid electrical shock and microwave radiation hazard SHARP ELECTRONICS CORPORATION SHARP PLAZA MAHWAH NEW JERSEY 07430 2135 R 310AK R 330AK R 330AW PRODUCT DESCRIPTION GENERAL INFORMATION OPERATION TROUBLESHOOTING GUIDE AND TEST PROCEDURE TOUCH CONTROL PANEL COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE WIRING DIAGRAM PARTS LIST FOR R 310AK PARTS LIST FOR R 330AK AW R 310AK R 330AK R 330AW ITEM SPECIFICATION DESCRIPTION Power Requirements 120 Volts 13 0 Amperes 60 Hertz Single phase 3 wire grounded Power Output 1000 watts IEC 705 TEST PROCEDURE Operating frequency of 2450MHz Case Dimensions Width 20 1 2 Height 11 7 8 Depth 15 7 8 Cooking Cavity Dimensions 0 9 Cubic Feet Width 13 3 4 Height 8 3 8 Depth 14 7 8 Control Complement Touch Control System Clock 1 00 12 59 Timer 0 99 min 99 seconds Microwave Power for Variable Cooking Repetition Rate Full power throu
29. 330AW RRLY A076DREO Relay OMIF S 124LM R 330AK UJ UJ 09 UJ UU UJ UJ UJ N N SIS S S S LY A076DRE0 Relay 5 1241 R 330AW LY A094DRE0 Relay OMIF S 112LM R 310AK LM A014DREO Buzzer 22 TRNPA110DREO ransformer R 310AK TRNPA111DREO ransformer R 330AK TRNPA111DREO ransformer R 330AW RH VZAO32DREO Varistor 10G471K 2161 1 Zener diode HZ16 1 R 330AK 2161 1 Zener diode HZ16 1 R 330AW DPWBFB611WRKO CPU unit R 310AK DPWBFB616WRKO CPU unit R 330AK DPWBFB616WRKO CPU unit R 330AW FPNLCB279WRKO Control panel frame with key unit R 330AW FPNLCB280WRKO Control panel frame with key unit FPNLCB281WRKO Control panel frame with key unit R 310AK FUNTKA793WREO Key unit R 330AW FUNTKA794WREO Key unit R 330AK FUNTKA795WREO Key unit R 310AK PSHEPA588WREO LED sheet N BO28WRFO Open button R 330AK l N BO29WRFO Open button R 330AW JBTN B028WRFO Open button R 310AK MSPRCA050WREO Open button spring XEPSD30P08XSO Screw 3mm x 8mm QS sp um ipo e e 4 1 O1 BW Q WW NIN 16 310 R 330AK R 330AW INFORMATION FOR PARTS CHANGING R 310AK Interchangeability oLD New
30. 5 69 015 119 39068 090 ASL 798 ASL 198 4001 9 3001 224 001 224 83691 10 200 39967 71 221 0 99 INLOLVH 020 HO1ON YHOLON WLOLWHY 318v INun L 1 0 020 2 09 AOcL OV 2 202 GO 681 HOSN3S 3009 62 86 101 ZOSZH 202 LO LG 32 310 R 330AK R 330AW
31. CONTROL PANEL KEY UNIT WRONG OPERATION Oven lamp does not go out when door is closed Oven lamp does not light in cook ing cycle Lights when door is opened Oven lamp lights but fan motor and turntable motor do not oper ate Oven does not go into cook cycle when START pad is touched Oven seems to be operating but little or no heat is produced in oven load Food incompletely cooked or not cooked at all at end of cook cycle COOKING CONDITION Oven goes into a cook cycle but extremely uneven heating is pro duced in oven load food Oven does not cook properly when programmed for Cooking Power 5 mode Operates prop erly on Cooking Power 10 HIGH mode Oven goes into COMPU DE FROST but food is not defrosted well AH sensor does not end during Sensor cooking condition Oven SENSOR does not shut off after a cup of COOKING water is boiling by sensor cook CONDITION FOR ing R 330AK AW Oven stops at 16 sec after start ing 10 310 R 330AK R 330AW TEST PROCEDURES PROCEDURE LETTER A MAGNETRON ASSEMBLY TEST COMPONENT TEST HIGH VOLTAGES ARE PRESENT DURING THE COOK CYCLE SO EXTREME CAUTION SHOULD BE OBSERVED DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING Totestfor an open filament isolate the magnetron from the high voltage circui
32. J J O gt x DMO XFPSD40P08K00 XFPSD30P06000 5 40 08 0 XHTSD40P12RVO XOTSD40P12RVO XOTSD40P12000 XOTSF40P08000 36 HOW ORDER REPLACEMENT PARTS To have your order filled promptly and correctly please furnish the following information 1 MODEL NUMBER 2 REF NO 3 PART NO Order Parts from the authrized SHARP parts Distributor for your area Defective parts required return should be returned as indicated in the Service Policy 4 DESCRIPTION 310 R 330AK R 330AW PACKING AND ACCESSORIES 310 PAD ASSEMBLY FPADBA341WRKO DOOR PROTECTION SHEET SPADPA204WREO PLASTIC BAG SSAKHA034WREO 6 8 INSTRUCTION BOOK 2 8 PRINTING MATTER CF 6 2 TURNTABLE TRAY BOTTOM PAD ASSEMBLY 6 D TURNTABLE SUPPORT FPADBA342WRK0 INTO THE OVEN CAVITY TRAY SPADFA397WRE0 Not replaceable items PACKING CASE SPAKCC831WRE0 37 R 310AK R 330AK R 330AW Oct 1996 production Kfor the oven from 90 AND 310 38 3 310 R 330AK R 330AW r Before attaching Control unit to Control panel Foil side of Control unit must be cleaned by ethyl alcohol CAPACITOR
33. Lead wire harness WH A Capacitor luF 50V Capacitor Capacitor VCEAB31VW Capacitor VCEAB31CW Capacitor RC KZA087DRI Capacitor VCKYD11CY1 Capacitor VCEAB31HW1 Capacitor 21 VCKYD11CY1 Capacitor 0 01 1 VCKYD11HB331 Capacitor 330 RCRS A012DRE Ceramic resonator CST4 00MGW RSRCDAO13DRE Diode bridge 51 10 VHD1SS270A Diode 155270 VHD1SS270A Diode 155270 155270 Diode 155270 RH IZA737DRE 51 RH IZA495DRE VHPSLZ2381A9 3 Light emitting diode VS2SB1238 3 Transistor VSDTA123ES 3 Transistor VSKRA101M 3 Transistor VSKRA101M 3 Transistor VSKRC243M 3 Transistor VSDTA143ES 1B Transistor VSKRA101M 3 Transistor VS2SB1238 3 Transistor VRD B12EF242Jg Resistor VRD B12HF 681d Resistor VRD B12HF511J Resistor VRD B12EF472d Resistor VRD B12EF103J Resistor VRD B12EF472Jg Resistor VRD B12EF472Jg Resistor VRD B12EF153J Resistor VRD B12EF 332d Resistor VRD B12EF153d Resistor VRD B12EF270d Resistor 12 1530 Resistor CPWBFA710WR 94 QCNCWA057D QCNCMA237D FW VZA195D FW VZA197D FW VZA196D RC KZA087D 1 D 1 4 OOG OGOOGO O DJ gt VCEAB31CW 2 087 D Q 1 RON N Oo vn NPL
34. PROCEDURES COMPONENT TEST 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 the foil pattern is open follow the troubleshooting guide given below for repair Problem POWER ON indicator does not light up STEPS OCCURRENCE CAUSE OR CORRECTION 1 The rated AC voltage is not present between Pin No 3 of the 2 pin connector A and the terminal of the RY2 Check supply voltage and oven power cord 2 The rated AC voltage is present at primary Low voltage transformer or secondary circuit defective side of low voltage transformer Check and repair 3 Only pattern at a is broken Insert jumper wire J1 and solder 4 Pattern at a and b are broken Insert the coil RCILF2003YAZZ between c and d NOTE At the time of making these repairs make avisualinspection of the varistor Check for burned damage and exam ine the transformer with a tester for the presence of layer short circuit check the primary coil resistance which is ap proximately 2120 10 for R 330AK AW 5630 10 for R 310AK If any abnormal condition is detected replace the defective parts 310 R 330AK R 330AW TOUCH CONTROL PANEL ASSEMBLY OUTLI
35. SN B FW VZA196D wire harness WH 1 LHLD A171W holder RC KZA087DRE Capacitor O luF 50V VCEAB31EW108 Capacitor 1000uF 25V VCEAB31VW108 Capacitor 1000uF 35V VCEAB31VW108 Capacitor 1000uF 35V RC KZA087DRE Capacitor 0 luF 50V RC KZA087DRE Capacitor 0 10 50V VCEAB31VW106 Capacitor 10uF 35V VCEAB31VW106 Capacitor 10uF 35V VCEAB31VW106 Capacitor 10uF 35V 11 51 1 Diode 11ES1 VHD1SS270A 1 Diode 155270 512381 9 3 Light emitting diode VS2SB1238 3 Transistor 2SB1238 R 330AK VS2SB1238 3 Transistor 2SB1238 R 330AW VS2SA933S 3 Transistor 2SA933 R 310AK VSKRC243M 3 Transistor KRC243M VRD B12EF242J Resistor 2 4k o 1 4W VRD EF242J Resistor 2 4 1 4W R 330AW VRD HF681J Resistor 68 1 2W R 330AK VRD HF681J Resistor 68 1 2W R 330AW CPWBFA722WR CPWBFA723WR CPWBFA723WR QCNCMA394DR QCNCMA422DRE R R R R FW VZA195D FW VZA197D 0 14 Hj R 330AK T 3 VRD 9117 Resistor 91 1 2W R 310AK VRD 5117 Resistor 51 1 2W R 330AK VRD 5117 Resistor 51 1 2W R 330AW VRD EF270J Resistor 27 1 4W VRD EFA72J Resistor 4 7k 1 4W 12 3320 Resistor 3 3k ohm 1 4W RRLY A021DREO Relay OJSH112LM UL R 310AK RRLY A075DREO Relay OJE SS 124LM R 330AK RRLY A075DREO Relay OJE SS 124LM R
36. WIRING AFTER REMOVING OUTER CASE CONTROL PANEL ASSEMBLY REMOVAL 1 Disconnect oven from power supply and remove outer Caso CPU unit Solder 2 Discharge high voltage capacitor These should be parallel 3 Disconnect wire leads from the door sensing switch and the Connector E oven cavity front flange H 4 Disconnect the wire leads from panel components 7 Power unit 5 Make one 1 tab of the oven cavity front plate straight holding the control panel assembly to the oven flange 6 Slide the control panel assembly upward and remove it 7 individual components can be removed Figure C 9 Side view of CPU unit and Power unit Handle the CPU unit carefully so that the ribbon cable does not come off Because the ribbon cable is sticked NOTE 1 Before attaching anew key unit wipe off remainin adhesive piu onthe LCD andthe printed wiring board only by heated completely with a soft cloth soaked in alcohol paste 2 When attaching the key unit to the control panel frame adjust the upper edge and right edge of Hibpon cable the key unitto the correct position of control panel 5 88 8 3 Stick the key unit firmly to the control panel frame 53 25 rubbing with cloth not to scratch Sa 5 UNIT AND POWER UNIT NOTE When soldering the CPU unit and the
37. as LSI ICs 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 Liquid crystal display rubber connector Control Unit and Key Unit and troubleshooting by replacement is described according to the symptoms indicated 1 Key Unit Note Check key unit ribbon connection before replacement The following symptoms indicate a defective key unit Replace the key unit a When touching the pads a certain pad produces no signal at all b When touching a number pad two figures or more are displayed c When touching the pads sometimes a pad produces no signal Control Panel The following symptoms indicate a defective control unit Before replacing the control unit perform the Key unit test Procedure to determine if control unit is faulty 2 1 In connection with pads a When touching the pads a certain group of pads do not produce a signal b When touching the pads no pads produce a signal 2 2 In connection with indicators At a certain digit all or some segments do not light up At a certain digit brightness is low Only one indicator does not light The corresponding segments of all digits do not light up or they continue to light up Wrong figure appears f A certain group of indicators do not light up g The figure of all digits flicker 2 3 Other possible pr
38. be amplified by the operational amplifier Each thermistor is supplied with a current to keep it heated at about 150 C 302 F the resultant heat is dissipated in the air and if the two thermistors are placed in different humidity conditions they show different degrees of heat conductivity leading to a potential difference between them causing an output voltage from the bridge circuit the intensity of which is increased as the absolute humidity of the air increases Since the output is very minute it is amplified by the operational amplifier Absolute humidity vs output voltage characterist Operational R1 amplifier Output voltage S Thermistor open vessel Thermistor closed vessel Output voltage Absolute humidity g m 3 Detector Circuit of Absolute Humidity Sensor Circuit This detector circuit is used to detect the output voltage of the absolute humidity circuit to allow the LSI to control sensor cooking of the unit When the unit is set in the sensor cooking mode 16 seconds clearing cycle occurs 22 than the detector circuit starts to function and the LSI observes the initial voltage available at its AN1 terminal With this voltage given the switches SW1 to SW5 in the LSI are turned on in such a way as to change the resistance values in parallel with R3 R7 01102 Changing the resistance values results in that there is the same potential at both F 3 terminal of the absolute humidity senso
39. cook cycle cannot take place until the door is firmly closed thereby activating both inter lock switches The primary interlock system consists of the door sensing switch and primary interlock relay located on the control circuit board MONITOR SWITCH The monitor switch is activated the contacts opened by the latch head on the door while the door is closed The switch is intended to render the oven inoperative by means of blowing the monitor fuse when the contacts of the primary interlock relay and secondary interlock switch fail to open when the door is opened Functions 1 When the door is opened the monitor switch contact close to the ON condition due to their being normally closed At this time the primary interlock relay and secondary interlock switch OFF condition contacts open due to their being normally open contact switches 2 Asthe door goes to a closed position the monitor switch contacts are first opened and then the door sensing switchandthe secondary interlock switch contacts close On opening the door each of these switches operate inversely 3 Ifthe dooris opened and the primary interlock relay and secondary interlock switch contacts fail to open the monitor fuse blows simultaneously with closing of the monitor switch contacts CAUTION BEFORE REPLACING A BLOWN MONITOR FUSE TEST THE DOOR SENSING SWITCH PRIMARY INTERLOCK RELAY SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH FOR PR
40. meter should indicated an open circuit with the door open and a closed circuit with the door closed If improper operation is indicated replace the door sensing switch NOTE If the door sensing switch contacts fail in the open position and the door is closed the cooling fan turntable and oven light will be activated by RY1 PRIMARY INTERLOCK RELAY Disconnect two 2 wire leads from the male tab terminals of the Primary Interlock Relay Check the state of the relay contacts using a ohmmeter The relay contacts should be open If the relay contacts are closed replace the circuit board entirely or the relay itself MONITOR SWITCH Disconnect the oven from power supply Before performing this test make sure that the secondary interlock switch and the primary interlock relay are operating properly according to the above Switch Test Procedure Disconnect the wire lead from the monitor switch NC terminal Check the monitor switch operation by using the ohmmeter as follows When the door is open the meter should indicate a closed circuit When the monitor switch actuator is pushed by a screw driver through the lower latch hole on the front plate of the oven cavity with the door opened in this condition the plunger of the monitor switch is pushed in the meter should indicate an WA open circuit If improper operation is indicated the m b 32 switch be defective After testing the moni
41. results When the food is cooked water vapor is developed The sensor senses the vapor and its resistance increases gradually When the resistance reaches the value set ac cording to the menu supplementary cooking is started The time of supplementary cooking is determined by experi ment with each food category and inputted into the LSI An example of how sensor works SOUP 1 Soup at room temperature Vapor is emitted very slowly Wa 2 Heat Soup Moisture and humidity is emitted rapidly You can smell the aroma as it cooks SENSOR I ROW SCHEMATIC NOTE CONDITION OF OVEN 1 DOOR CLOSED 2 CLOCK APPEARS ON DISPLAY OUTER CASE MONITOR THERMAL SWITCH FUSE CUT OUT OVEN THERMAL CUT OUT MG R 310AK R 330AK R 330AW 3 Sensor detects moisture and humidity and calculates cooking time and variable power Cooking Sequence 1 Touch one of the INSTANT SENSOR pads NOTE The oven should not be operated on INSTANT SENSOR immediately after plugging in the unit Wait five minutes before cooking on INSTANT SENSOR 2 Thecoil of shut off relay RY 1 is energized the turntable motor oven lamp and cooling fan motor are turned on but the power transformer is not turned on 3 After about 16 seconds the cook relay RY 2 is energized The power transformer is turned on microwave energy is produced and first stage is started The 16 seconds is t
42. serving only this appliance be provided When installing this appliance observe all applicable codes and ordinances A short power supply cord is provided to reduce risks of becoming entangled in or tripping over longer cord Where a two pronged wall receptacle is encountered it is the personal responsibility and obligation of the customer to contact a qualified electrician and have it replaced with a properly grounded three pronged wall receptacle or have a grounding adapter properly grounded and polarized If an extension cord must be used it should be a 3 wire 15 amp or more cord Do not drape over a countertop or table where it can be pulled on by children or tripped over accidentally 3 Pronged Plug 98 R 310AK R 330AK R 330AW rounded Receptacle Box Grounding Pin 3 Pronged Receptacle CAUTION DO NOT UNDER ANY CIRCUMSTANCES CUT OR REMOVE THE ROUND GROUNDING PRONG FROM THIS PLUG OVEN DIAGRAM 1 One touch door open button Push to open door 2 Door latches The oven will not operate unless the door is securely closed 3 Removable turntable support 4 Removable turntable The turntable will rotate clockwise or counterclockwise 5 Oven lamp It will light when oven is operating 6 Oven door with see through window 9 Time display Digital display 99 minutes 99 seconds 7 Ventilation openings Rear 10 Coupling 8 Auto Touch control panel 11 Wave guide cover 12 Power su
43. 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 4 Servicing Tools Tools required to service the touch control panel assembly 1 Soldering iron 30W It is recommended to use a soldering iron with a grounding terminal 2 Oscilloscope Single beam frequency range DC 10MHz type or more advanced model 3 Others Hand tools 5 Other Precautions 1 Before turning on the power source of the control unit remove the aluminium foil applied for preventing static electricity 2 Connect the connectors of the key unit to the control unit being sure that the lead wires are not twisted 3 After aluminium foil is removed be careful that abnormal voltage due to static electricity etc is not applied to the input or output terminals 4 Attach connectors electrolytic capacitors etc to PWB making sure that all connections are tight 5 Besuretouse specified components where high precision is required R 310AK R 330AK R 330AW COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE CAUTION DISCONNECT OVEN FROM POWER SUPPLY BEFORE REMOVING OUTER CASE DISCHARGE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING AFTER REMOVING OUTER CASE OUTER CASE REMOVAL To remove the components procedure as follows 1 Disconnect oven from power supply 2 Remove four 4 screws from rear and one
44. 1 screws along the right side of case 3 Slide the entire case back out about 1 inch 3 cm to free it from retaining clips on the cavity face plate 4 Lift entire case from the unit CAUTION DISCONNECT OVEN FROM POWER SUP PLY BEFORE REMOVING OUTER CASE POWER TRANSFORMER REMOVAL 1 Disconnect oven from power supply and remove outer case 2 Discharge high voltage capacitor 3 Disconnect wire leads from power transformer magnetron and capacitor terminals 4 Remove four 4 screws holding transformer to bottom plate right 5 Remove transformer from bottom plate right 6 Remove the one 1 terminal insulator and tube from filament lead longer one of power transformer Re install 1 Install the terminal insulator to receptacle of filament lead longer one of power transformer 2 Resttransformeronthe bottom plate right with its primary terminals toward the oven face plate 3 Secure transformer with four screws to bottom plate right 4 Re connect wire leads primary and high voltage to power transformer and filament leads of transformer to magnetron and high voltage capacitor Refer to PICTORIAL DIAGRAM on page 29 or 30 5 Re install outer case and check that oven is operating properly TERMINAL INSULATOR REPLACEMENT 1 Open covers of the terminal insulator by using small flat type screw driver 2 Remove the receptacle from the terminal insulator 3 Now the terminal insulator is free ERE Ins
45. 3 1 2 in and made of an electrically nonconductive 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 4 Set the cooking control on Full Power Cooking Mode 5 Close the door and select a cook cycle of several minutes If the water begins to boil before the survey is completed replace it with 275 ml of cool water C Leakage test Closed door leakage test microwave measurement 1 Grasp the probe of the survey instrument and hold it perpendicular to the gap between the door and the body of the oven 2 Move the probe slowly not faster than 1 in sec 2 5 cm sec along the gap watching for the maximum indication on the meter 3 Check for leakage at the door screen sheet metal seams and other accessible positions where the continuity of the metal has been breached eg around the switches indicator and vents While testing for leakage around the door pull the door away from the front of the oven as far as is permitted by the closed latch assembly 4 Measure carefully at the point of highest leakage and make sure that the highest leakage is no greater than 4 and that the secondary interlock switch does turn the oven OFF before any door movement NOTE After servicing record data on service invoice and microwave leakage report SERVICE MANUAL SHARP MICROWAVE OVEN R 310AK R 330AK R
46. 60 When no key is touched the signal is held at H level R61 Signal similar to R60 When either G11 line on key matrix is touched a corresponding signal will be input into R61 R62 Signal similar to R60 When either G10 line on key matrix is touched a corresponding signal will be input into R61 R63 Signal similar to R60 When either 9 line on key matrix is touched a corresponding signal will be input into R61 AINO To input signal which communicates the door open close information to LSI Door close H level signal OV Door open L level 5V AIN1 AIN3 Terminal to change functions according to the Model By using the A D converter contained in the LSI DC voltage in accordance with the Model in operation is applied to set up its function 310 R 330AK R 330AW Description Power source voltage 5V VSS voltage of power source circuit input Magnetron high voltage circuit driving signal To turn on and off the cook relay RY2 The signals holds L level during microwave cook ing and H level while not cooking In other cooking modes variable cooking the signal turns to H level and L level repetition according to the power level 8 sec ON and OFF times for other power level Signal to sound buzzer 2 0 kHz 0 1 sec A key touch sound B Completion sound B Oven lamp fan motor and turntable motor driving signal To
47. NE OF TOUCH CONTROL PANEL The touch control section consists of the following units 1 Key Unit 2 Control Unit The Control Unit consists of Power Unit and CPU Unit The principal functions of these units and the signals com municated among them are explained below Key Unit R 330AK AW The key unit is composed of a matrix signals generated in the LSI are sent to the key unit through P20 P27 When a key pad is touched a signal is completed through the key unit and passed back to the LSI through P74 P77 to perform the function that was requested Key Unit R 310AK The key unit is composed of a matrix signals generated in the LSI are sent to the key unit through P73 P81 P82 P83 P90 and P91 When a key pad is touched a signal is completed through the key unit and passed back to the LSI through P60 P63 to perform the function that was requested Control Unit Control unit consists of LSI ACL circuit indicator circuit power source circuit relay circuit buzzer circuit synchroniz ing signal circuit absolute humidity sensor circuit and back light circuit 1 ACL This circuit generates a signal which resets the LSI to the initial state when power is supplied 2 Indicator Circuit R 330AK AW This circuit consists of 25 segments and 4 common elec trodes using a Liquid Crystal Display 2 Indicator Circuit R 310AK 3 4 5 6 7 8 9 lt lt This
48. OPER OPERATION RE FER TO CHAPTER TEST PROCEDURE NOTE MONITOR FUSE AND MONITOR SWITCH ARE REPLACED AS AN ASSEMBLY OUTER CASE SWITCHES For the ovens from Oct 1996 production The two outer case switches are mounted near the power supply cord at the oven cavity rear plate When the outer case cabinet is installed with the screws one of the screws pushes the actuator and then the actuator pushes the two plungers of outer case switches and their contacts are closed When a cabinet mounting screw which is pushing the actuator is removed the two outer case switches inter rupt the circuit to the all components OUTER CASE OUTER CASE SWITCHES This outer case mounting screw is push ing the actuator ACTUATER R 310AK R 330AK R 330AW TURNTABLE MOTOR The turntable motor rotates the turntable located on the bottom of the oven cavity so that the foods on the turntable cook evenly during cooking The turntable may turn in either direction COOLING FAN MOTOR The cooling fan motor drives a blade which draws external cool air This cool air is directed through the air vanes surrounding the magnetron and cools the magnetron This air is channelled through the oven cavity to remove steam and vapors given off from the heating foods It is then exhausted through the exhausting air vents at the oven cavity MONITOR FUSE 1 The monitor fuse blows when the contacts COM NO of the primary interlock relay and seconda
49. R 330AK AW R 310AK RY1 Approx 24 0V D C Approx 15 5V D C Oven lamp Turntable motor Cooling fan motor RY2 Approx 23 0V D C Approx 12 0V D C Power transformer M COMPU DEFROST TEST 1 Place one cup of water in the center of the turntable tray in the oven cavity 2 Close the door touch the COMPU DEFROST pad twice and touch the Number pad 5 And then touch the START pad for 310 Close the door touch the COMPU DEFROST pad and touch the Number pad 2 and touch Number pad 5 And then touch the START pad for R 330AK AW 3 The oven is in Compu Defrost cooking condition 4 The oven will operate as follows 1ST STAGE 2ND STAGE STAGE LEVEL TIME LEVEL TIME LEVEL TIME 0 51 5 7096 40sec 50 385 30 43sec WEIGHT 5 If improper operation is indicated the control unit is probably defective and should be checked 14 310 R 330AK R 330AW TEST PROCEDURES PROCEDURE LETTER N 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 fuse If the foil pattern is open follow the troubleshooting guide given below for repair Problem POWER ON indicator does not light up COMPONENT TEST STEPS OCCURRENCE CAUSE OR COR
50. RECTION 1 The rated AC voltage is not present between Check supply voltage and oven power cord Pin No 3 of the 2 pin connector A and the common terminal of the relay RY2 2 The rated AC voltage is present at primary Low voltage transformer or secondary circuit defective side of low voltage transformer Check and repair 3 Only pattern at a is broken Insert jumper wire J1 and solder 4 Pattern at a and b are broken Insert the coil RCILF2003YAZZ between c and d NOTE At the time of making these repairs make a visual inspection of the varistor Check for burned damage and examine the transformer with a tester for the presence of layer short circuit check the primary coil resistance which is approximately 2100 15 for R 330AK AW 5400 20 for R 310AK If any abnormal condition is detected replace the defective parts RY2 Iri I LSHA V NO 10 9 9 aA ESHA RY1 R 330AK AW 310 SENSOR TEST For R 330AK AW Checking the initial sensor cooking condition 1 The oven should be plugged in at least five minutes before sensor cooking 2 Room temperature should not exceed 95 F 35 3 The unit should not be installed in any area where heat and ste
51. STMENT toward the oven face Both results play in the door should be less than 0 5mm The door sensing switch and secondary interlock switch interrupt the circuit before the door can be opened Monitor switch contacts close when door is opened Re install outer case and check for microwave leakage around door with an approved microwave survey meter Refer to Microwave Measurement Procedure Door Sensing Switch Monitor Switch Secondary Interlock Switch Figure C 4 Latch Switch Adjustments OUTER CASE SWITCHES REPLACEMENT for the ovens from October 1996 production 3 Re connect the wire leads to the outer case switches referring to the Pictorial diagram Re install the one 1 snap of the main wire harness to the hole of the switch holder Catch the two 2 tabs of the switch holder to the two 2 holes of the oven cavity rear plate Re connect the switch holder outer case switch assembly to the oven cavity rear plate with the one 1 screw Re install the outer case cabinet and check thatthe oven is operating properly S5 Outer switch Actuater Switch holder Outer switch Figure C 5 Outer case switches replacement DOOR REPLACEMENT REMOVAL 1 2 3 Disconnect oven from power supply Push the open button and open the door slightly Insert an putty knife thickness of about 0 5mm in
52. Signal similar R60 When either G11 line on key matrix is touched a corresponding signal will be input into R61 R62 Signal similar to R60 When either G10 line on key matrix is touched a corresponding signal will be input into R62 R63 Signal similar to R60 When either 9 line on key matrix is touched a corresponding signal will be input into R63 AINO To input signal which communicates the door open close information to LSI Door close H level signal OV Door open L level 5V AIN1 AIN3 Terminal to change functions according to the Model By using the A D converter contained in the LSI DC voltage in accordance with the Model in operation is applied to set up its function Power source voltage 5V VSS voltage of power source circuit input 310 R 330AK R 330AW em Magnetron high voltage circuit driving signal To turn on and off the cook relay RY2 The signals holds L level during microwave cooking and H level while not cooking In other cooking modes variable cooking the signal turns to H level and L level in repetition according to the power level ON and OFF times for other power level 0 1 sec gt Signal to sound buzzer 2 0 kHz A key touch sound B Completion sound B Oven lamp fan motor and turntable motor driving signal To turn on and off shut off rel
53. URE THE FILAMENT AND HIGH VOLTAGE C HIGH VOLTAGE RECTIFIER TEST DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING Isolate the rectifier from the circuit Using the highest ohm scale ofthe meter read the resistance across the terminals and observe reverse the leads to the rectifier terminals and observe meter reading If a short is indicated in both directions or if an infinite resistance is read in both directions the rectifier is probably defective and should be replaced NOTE Be sure to use an ohmmeter that will supply a forward bias voltage of more than 6 3 volts 11 R 310AK R 330AK R 330AW PROCEDURE LETTER D TEST PROCEDURES COMPONENT TEST HIGH VOLTAGE CAPACITOR TEST DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING Ifthe capacitor is open no high voltage will be available to the magnetron Disconnect input leads and check for short or open between the terminals using an ohmmeter Checking with a high ohm scale if the high voltage capacitor is normal the meter will indicate continuity for a short time and should indicate an open circuit once the capacitor is charged If the above is not the case check the capacitor with an ohmmeter to see if itis shorted between either of the terminals and case If it is shorted replace the capacitor OVEN THERMAL CUT OUT A continuity check across the thermal cut out terminals should indicate a c
54. am are generated The unit should not be installed for example next to a conventional surface unit Refer to the INSTALLATION INSTRUCTIONS of the operation manual 4 Exhaust vents are provided on the back of the unit for proper cooling and air flow in the cavity To permit adequate ventilation be sure to install so as notto block these vents There should be some space for air circulation 5 Be sure the exterior ofthe cooking container andthe interior ofthe oven are dry Wipe off any moisture with a dry cloth or paper towel 6 The Sensor works with food at normal storage temperature For example chicken pieces would be at refrigerator temperature and canned soup at room temperature 7 Avoid using aerosol sprays or cleaning solvents near the oven while using Sensor settings The sensor will detect the vapour given of by the spray and turn off before food is properly cooked 8 If the sensor has not detected the vapour of the food ERROR will appear and the oven will shut off Water load cooking test Make sure the oven has been plugged in at least five minutes before checking sensor cook operation The cabinet should be installed and screws tightened 15 R 310AK R 330AK R 330AW PROCEDURE LETTER TEST PROCEDURES COMPONENT TEST 1 Fill approximately 200 milliliters 7 2 oz of tap water in a 1000 milliliter measuring cup 2 Place the container on the center of tray in the oven cavity 3 Close the door 4 To
55. ance R 310AK R 330AK R 330AW MICROWAVE MEASUREMENT PROCEDURE A Requirements 1 Microwave leakage limit Power density limit The power density of microwave radiation emitted by a microwave oven should not exceed 1mW cm at any point bcm or more from the external surface of the oven measured prior to acquisition by a purchaser and thereafter through the useful life of the oven 5 mW crr at any point or more from the external surface of the oven 2 Safety interlock switches Primary interlock relay and door sensing switch shall prevent microwave radiation emission in excess of the requirement as above mentioned secondary interlock switch shall prevent microwave radiation emission in excess of 5 mW cm at any point 5cm or more from the external surface of the oven B Preparation for testing Before beginning the actual measurement of leakage proceed as follows 1 Make sure that the actual instrument is operating normally as specified in its instruction booklet Important Survey instruments that comply with the requirement for instrumentation as prescribed by the performance standard for microwave ovens 21 CFR 1030 10 3 1 must be used for testing 2 Place the oven tray in the oven cavity 3 Place the load of 275 15 ml 9 8 oz of tap water initially at 2055 68 F in the center of the oven cavity The water container shall be a low form of 600 ml 20 oz beaker with an inside diameter of approx 8 5 cm
56. ay RY1 The square waveform voltage is delivered to the RY1 driving circuit and RY2 control circuit During cooking Key strobe signal Signal applied to touch key section pulse signal is input to R60 R63 terminal while one of G8 line keys on key matrix is touched Signal synchronized with commercial power source frequency This is the basic timing for time processing of LSI 16 7 msec Key strobe signal Signal applied to touch key section A pulse signal is input to R60 R63 terminal while one of G7 line keys on key matrix is touched Key strobe signal Signal applied to touch key section A pulse signal is input to R60 R63 terminal while one of G6 line keys on key matrix is touched Key strobe signal Signal applied to touch key section A pulse signal is input to R60 R63 terminal while one of G5 line keys on key matrix is touched Key strobe signal Signal applied to touch key section A pulse signal is input to R60 R63 terminal while one of G4 line keys on key matrix is touched Key strobe signal Signal applied to touch key section A pulse signal is input to R60 R63 terminal while one of G3 line keys on key matrix is touched Terminal not used Internal clock oscillation frequency setting input The internal clock frequency is set by inserting the capacitor and resistor circuit with respect to XOUT terminal Internal clock oscillation freq
57. blade UC A652WRPO Fan duct VN A371WRTO Oven cavity GFA180WRWO Chassis support GQA452WRPO Partition angle GQA454WRPO MG thermo angle EVPA194WRFO Switch lever CPL A045WRFO Coupling PCUSGA385WRPO Cushion PCOVPA275WREO Waveguide cover PCUSGA339WRPO Cushion PCUSUA212WRPO hion PCUSUA235WRPO hion PCUSUA376WRPO hion PCUSUA278WRPO hion PGIDHA058WRPO air guide PACGAO0AIWREO Cushion PACGA084WRFO TTM packing aye D D Q EEE DOOR PARTS RFA303WRTO Door panel EPA382WREO Sealer film KPA448WRRO Door frame L A662WREO Door screen GCOVHA37 0WRF 0 Choke cover LSTPPA139WRFO Latch head MSPRTAO84WREO atch spring LSTPPA162WRFO Door stopper XCPSD40P06000 Screw 4mm x 6mm MISCELLANEOUS FROLPA079WRKO Turntable support NTNT A079WREO urntable tray FW VZB547WREO Main wire harness until September 1996 production FW VZB572WREO Main wire harness from October 1996 production QW QZA150WREO High voltage wire B PZET A012WREO erminal insulator TCAUAA166WRRO DHHS caution label TCAUAA200WRRO Monitor caution label TCADCA611WRRO Instruction book TSPCNC381WRRO Rating label SCREWS NUTS AND WASHERS O C ES pore gt gt gt CO CO gy 0 J Q
58. cally after the water is boiling bubbling If new sensor dose not operate properly the problem is with the control unit CHECKING CONTROL UNIT 1 Disconnect oven from power supply and remove outer case 2 Discharge the high voltage capacitor 3 Disconnect the wire leads from the cook relay 4 Disconnect the sensor connector that is mounted to control panel 5 Then connect the dummy resistor circuit See fig to the sensor connector of control panel 6 Reconnect the oven to the power supply and check the sensor cook operation proceed as follows 6 1 Touch REHEAT pad once 6 2 The control panel is in the sensor cooking operation 6 3 After approximately 20 seconds push plunger of select switch for more than 3 seconds This condition is same as judgement by AH sensor 6 4 After approximately seconds the display shows X X X X which is the remaining cooking time and the display count down If the above is not the case the control unit is probably defective If the above is proper the AH sensor is probably defective 81 82 2203 1 1 2W 7 Plunger 10kQ 5 1 4W NC R4 1MQ 5 1 4W connector F on Control Unit 2 1 F1 lt z NO 2 3 R1 3 N 525 M Sensor Dummy Resistor Circuit 16 310 R 330AK R 330AW TOUCH CONTROL PANEL ASSEMBLY
59. circuit consists of 12 segments and 3 common elec trodes using a Liquid Crystal Display Power Source Circuit This circuit generates voltages necessary in the control unit from the AC line voltage In addition the synchronizing signal is available in order to compose a basic standard time in the clock circuit Symbol Voltage Application VC 5 3V LSI IC1 Relay Circuit A circuitto drive the magnetron fan motor turntable motor and light the oven lamp Buzzer Circuit The buzzer is responsive to signals from the LSI to emit audible sounds key touch sound and completion sound Synchronizing Signal Circuit The power source synchronizing signal is available order to compose a basic standard time in the clock circuit It accompanies a very small error because it works on commercial frequency Door Sensing Switch A switch to tell the LSI if the door is open or closed Back Light Circuit A circuit to drive the back light Light emitting diodes LD1 LD5 Absolute Humidity Sensor Circuit R 330AK AW This circuit detects moisture of the cooking food to allow its automatic cooking 310 R 330AK R 330AW DESCRIPTION OF LSI LSI IZA757DR R 330AK AW The signal of the LSI IZA757DR is detailed in the following table EISE Terminal not used Power source voltage input terminal Standard voltage for LCD Terminal to change cooking constant according to the Model By u
60. data signal 2 Connected to LCD Pin No 3 COM1 Common data signal COM1 Connected to LCD Pin No 4 SEGI SEGI12 Terminal not used SEG13 Segment data signal Connected to LCD The relation between signals are as follows LSI signal Pin No LCD Pin No LSI signal Pin No LCD Pin No SEG 14 SEG16 Segment data signal Signal similar to SEG 13 SEG17 Terminal not used SEG 18 SEG24 Segment data signal Signal similar to SEG 13 SEG25 Terminal not used P81 P87 Segment data signal Signal similar to SEG 13 P90 P91 P97 Terminal not used Segment data signal Signal similar to SEG 13 VCC Connected to GND P10 P12 Terminal not used P13 P17 Used for initial balancing of the bridge circuit absolute humidity sensor Oven lamp fan motor and turntable motor driving signal To turn on and off shut off relay RY1 The square waveform voltage is delivered to the RY1 driving circuit and RY2 control circuit 16 7 msec pe During cooking R 310AK R 330AK R 330AW sa o Terminal not used Magnetron high voltage circuit driving signal To turn on and off the cook relay RY2 The signals holds L level during microwave cook ing and H level while not cooking In other cooking modes variable cooking the signal turns to H level and L level in rep
61. determine if the control unit or key pad is at fault G8 G7 G6 G5 G4 G3 G2 G1 G8 G7 G6 G5 G4 G3 G2 G1 o CUSTOM o 5 4 3 2 1 REHEATPOPCORN 4 3 2 1 FROZEN BAKED o 0 9 8 7 POTATO LEVEL o 0 9 8 7 MINUTE FROZEN GROUND gc jp FRESHVEG FRESH VEG STOP START_ compu FRESH REHEAT eeverace DINNER TIMER PLUS VEG MEAT SOFT HARD CLEAR DEFROST VEGETABLE CASSEROLE PLATE a START FROZEN FRESH COMPU COMPU FISH POWER TIMER STOP CLOCK 5 FICE COOK sea Foon O LEVEL CLOOK MUFFIN POTATO CLEAR R 330AK AW R310AK L RELAY TEST Remove the outer case and check voltage between Pin No 3 of the 2 pin connector A and the common terminal of the relay RY2 on the control unit with an A C voltmeter The meter should indicate 120 volts if not check oven circuit RY1 and RY2 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 PERATIONAL V RELAY SYMBOL 2 2 SAGE CONNECTED COMPONENTS
62. e Before turning on microwave power for any service test or inspection within the microwave generating 5 check the magnetron wave guide or transmission line and cavity for proper alignment integrity and connections 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 this manual before the oven is released to the owner A microwave leakage check to verify compliance with the Federal Performance Standard should be performed on each oven prior to release to the owner 310 R 310AK R 330AK R 330AW BEFORE SERVICING Before servicing an operative unit perform a microwave emission check as per the Microwave Measurement Procedure outlined in this service manual If microwave emissions level is in excess of the specified limit contact SHARP ELECTRONICS CORPORATION immediately 1 800 237 4277 If the unit operates with the door open service person should 1 tell the user to operate the oven and 2 contact SHARP ELECTRONICS CORPORATION and Food and Drug Administration s Center for Devices and Radiological Health immediately Service personnel should inform SHARP ELECTRONICS CORPORATION of any certified unit found with emissions in excess of 4mW cm The owner of the unit should be instructed not to use the unit until the oven has been brought into compli
63. e latch spring to the door frame Re install latch head to door frame 3 Re install door panel to door frame by fitting nine 9 tabs of door frame to nine 9 holes of door panel Hold the door panel to the door frame by sliding the door panel upward 5 Put sealer film on door panel Refer to Sealer Film about how to handle new one 6 Re install choke cover to door panel by pushing 7 Catch two 2 pins of door panel on two 2 hole of upper and lower oven hinges 8 Re install the door stopper to the door assembly Note After any service to the door A Make sure that door sensing switch and secondary interlock switch are operating properly Refer to chapter Test Procedures B An approved microwave survey meter should be used to assure compliance with proper microwave radiation emission limitation standards After any service make sure of the following 1 Door latch heads smoothly catch latch hook through latch holes and that latch head goes through center of latch hole 2 Deviation of door alignment from horizontal line of cavity face plate is to be less than 1 0mm 3 Door is positioned with its face pressed toward cavity face plate Check for microwave leakage around door with an approved microwave survey meter Referto Microwave 28 Measurement Procedure Note Thedoorona microwave ovenis designed to act as an electronic seal preventing the leakage of microwave energy from oven cavity dur
64. e potential at both F 3 terminal of the absolute humidity sensor and ANO terminal of the LSI The voltage of AN1 terminal will indicate about 2 5V This initial balancing is set up about 16 seconds after the unit is put in the Sensor Cooking mode As the sensor cooking proceeds the food is heated to generate moisture by which the resistance balance of the bridge circuit is deviated to increase the voltage available at AN1 terminal of the LSI Then the LSI observes that voltage at AN1 terminal and compares it with its initial value and when the comparison rate reaches the preset value fixed for each menu to be cooked the LSI causes the unit to stop sensor cooking thereafter the unit goes in the next operation automatically When the LSI starts to detect the initial voltage at AN1 terminal 16 seconds after the unit has been put in the Sensor Cooking mode if it is not possible to balance of the bridge circuit due to disconnection of the absolute humidity sensor ERROR will appear on the display and the cooking is stopped 1 Absolute humidity sensor circuit 9 620k 20 R109 300k 21 C Thermistor in closed vesssl S Thermistor in open vessel 5V VA 15V 15V 310 R 330AK R 330AW COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE CAUTION DISCONNECT OVEN FROM POWER SUPPLY BEFORE REMOVING OUTER CASE DISCHARGE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR
65. ed box and then into the cavity where the food is placed to be cooked 5 Upon completion of the cooking time the power transformer oven lamp etc are turned off and the generation of microwave energy is stopped The oven will revert to the OFF condition 6 When the door is opened during a cook cycle monitor switch door sensing switch secondary interlock switch and primary interlock relay are activated with the following results The circuits to the oven lamp turntable motor the cooling fan motor and the high voltage components are de energized and the digital read out displays the time still remaining in the cook cycle when the door was opened 7 The monitor switch electrically monitors the operation of the secondary interlock switch and primary interlock relay and is mechanically associated with the door so that it will function in the following sequence 1 When the door opens from the closed position the primary interlock relay and secondary interlock switch open their contacts Then the monitor switch contacts close 2 When the door is closed from the open position the monitor switch contacts open first Then the contacts of the secondary interlock switch and primary interlock relay close If the secondary interlock switch and primary interlock relay fail with the contacts closed when the door is opened the closing of the monitor switch contacts will form a short circuit through the monitor fuse secondary inter
66. either G10 line on key matrix is touched a corresponding signal will be input into P75 Signal similar to P77 When either G9 line on key matrix is touched a corresponding signal will be input into P74 Oven lamp fan motor and turntable motor driving signal To turn on and off shut off relay RY1 The square waveform voltage is delivered to the RY1 driving circuit and RY2 control circuit During cooking Magnetron high voltage circuit driving signal To turn on and off the cook relay RY2 The signals holds L level during microwave cook ing and H level while not cooking In other cooking modes variable cooking the signal turns to H level and L level in repetition according to the power level 310 R 330AK R 330AW Terminal not used Connected to VC Auto clear terminal Signal is input to reset the LSI to the initial state when power is applied Temporarily set to L level the moment power is applied at this time the LSI is reset Thereafter set at level P81 P80 Terminal not used XIN Internal clock oscillation frequency input setting The internal clock frequency is set by inserting the ceramic filter oscillation circuit with respect to XIN terminal Internal clock oscillation frequency control output Output to control oscillation input of XOUT Power source voltage 5 1V VC
67. er Unit Circuit R 330AK AW 310 R 330AK R 330AW LINN ASM Qqaxva o1v1od NISSAN 5935 T3 31 MVOLE H 9 6 5 ASL 09H e Nazous 83A H3MOd HovVu3A38 lVdHdH HS3tud 318 139972209330 50114 3 LONIIN 9 Z 8 6 L 5 688 SL JSL 494 i 38 LSH ASL 299 ASL ASL SSH ASL 994 e 08 4066 190 709 906 208 0066 899 05 9066 90 022 19H 3022 22 you e 99255 44141 9348 LON dl 964 MOL L 03403486 LON 41 AA 5901 EL SL 3701 LZH 88 21 191 ef MY 5101 020 022 5101 050 2184 kon MOAHO ILI 111 1 581
68. es using a Liquid Crystal Display 3 Power Source Circuit This circuit generates voltages necessary in the control unit from the AC line voltage In addition the synchronizing signal is available in order to compose a basic standard time in the clock circuit Symbol Voltage Application 5V LSI IC1 4 Relay Circuit A circuit to drive the magnetron fan motor turntable motor and light the oven lamp 5 Buzzer Circuit The buzzer is responsive to signals from the LSI to emit audible sounds key touch sound and completion sound 6 Synchronizing Signal Circuit The power source synchronizing signal is available in order to compose a basic standard time in the clock circuit It accompanies a very small error because it works on commercial frequency 7 Door Sensing Switch A switch to tell the LSI if the door is open or closed 8 Back Light Circuit A circuit to drive the back light Light emitting diodes LD1 LD5 9 Absolute Humidity Sensor Circuit R 330AK AW This circuit detects moisture of the cooking food to allow its automatic cooking 17 R 310AK R 330AK R 330AW DESCRIPTION OF LSI LSI IZA737DR R 330AK AW The I O signal of the LSI IZA737DR is detailed in the following table Description Connected to GND Connected to VC Connected to VC Terminal not used Connected to GND Power source voltage 5 1V VC voltage of power source circuit input Internal clock oscillati
69. etition according to the power level Signal synchronized with commercial power source frequency This is basic timing for time processing of LSI 16 7 msec P 70 ON Connected to GND Used for initial balancing of the bridge circuit absolute humidity sensor This input is an analog input terminal from the AH sensor circuit and connected to the A D converter built into the LSI AH sensor input This input is an analog input terminal from the AH sensor circuit and connected to the A D converter built into the LSI Connected to GND To input signal which communicates the door open close information to LSI Door closed level signal OV Door opened level signal 5V Terminal to change cooking constant according to the Model By using the A D converter contained in the LSI DC voltage in accordance with the Model in operation is applied to set up its cooking constant LSI IZA738DR R 310AK The signal of the LSI IZA738DR is detailed in the following table Segment data signal Connected to LCD The relation between signals are as follows LSI signal Pin No LCD Pin No LSI signal Pin No LCD Pin No SEG 6 7 SEG 7 8 SEG 8 9 SEG 9 10 SEG 10 11 SEG 11 12 Signal coming from touch key When either G12 line on key matrix is touched a corresponding signal out of R73 R81 R83 and R90 R91 will be input into R
70. ghout the cooking time 90 of Full Power 80 of Full Power 70 of Full Power 60 of Full Power 50 of Full Power 40 of Full Power 30 of Full Power 20 of Full Power approx 10 of Full Power No power throughout the cooking time R 330AK R 330AW 310 5 ACTION pads COMPU DEFROST pad COMPU DEFROST pad INSTANT SENSOR pad Number selection pads MINUTE PLUS pad POWER LEVEL pad COMPU COOK pad TIMER CLOCK pad SNACKS amp REHEAT pad STOP CLEAR pad Number selection pads START MINUTE PLUS pad POWER LEVEL pad CLOCK pad KITCHEN TIMER pad STOP CLEAR pad START TOUCH ON pad Oven Cavity Light Yes Safety Standard UL Listed FCC Authorized DHHS Rules CFR Title 21 Chapter 1 Subchapter J GENERAL INFORMATION GROUNDING INSTRUCTIONS This oven is equipped with a three prong grounding plug It must be plugged into wall receptacle that is properly installed and grounded in accordance with the National Electrical Code and local codes and ordinances In the event of an electrical short circuit grounding reduces the risk of electric shock by providing an escape wire for the electric current WARNING Improper use of the grounding plug can result in a risk of electric shock 4 Electrical Requirements The electrical requirements are a 115 120 volt 60 Hz AC only 15 or 20 amp fused electrical supply It is recommended that a separate circuit
71. he cooling time required to remove any vapor from the oven cavity and sensor NOTE During this first stage do not open the door or touch STOP CLEAR pad 4 When the sensor detects the vapor emitted from the food the display switches over to the remaining cooking time and the timer counts down to zero At this time the door may be opened to stir turn or season food 5 When the timer reaches zero an audible signal sounds The shut off relay and cook relay are de energized and the power transformer oven lamp etc are turned off 6 Opening the door or touching the STOP CLEAR pad the time of day will reappear on the display and the oven will revert to an OFF condition This Circuit is only for R 330AK and R 330AW x These outer case switches will be used from Oct 1996 production RY 1 eve eee CONTROL UNIT TRANSFORMER 1 C m u 1 gt 8 iS 1 PRIMARY INTERLOCK n LUNG RELAY CAPACITOR 0 94uF a lt OVEN TURN LAMP TABLE MOTOR SECONDARY OUTER CASE INTERLOCK SWITCH SWITCH 0 00 4 212 o o 138 DOOR 4 SENSING SWITCH MONITOR RECTIFIER v 2 Figure 1 Oven Schematic Off Condition 310 R 330AK R 330AW SCHEMATIC NOTE CONDITION OF OVEN 1
72. ing 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 thatthe 23 two can t be separated For those models check and repair all the controls sensor related ones included of the touch control panel while keeping it connected to the oven 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 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 power source to the power input terminal of the touch control panel then itis possible
73. ing cook cycle This function does not require that door be air tight moisture condensation tight or light tight Therefore occasional appearance of moisture light or sensing of gentle warm air movement around oven door is not abnormal and do not of themselves indicate a leakage of microwave energy from oven cavity Upper oven hinge Door panel d e hinge XS Door stopper Choke cover Figure C 7 Door Replacement SEALER FILM Installation 1 Put the adhesive tape on the backing film of the sealer film as shown in Fig C 8 2 Tear the backing film by pulling the adhesive tape 3 Put the pasted side of the sealer film on the door panel Sealer film lt Backing film Adhesive tape Figure C 8 Sealer film 310 R 330AK R 330AW uononpoaud 9661 su Ao 10 e110 Iq 9 11614 H3WHO4SNVu L HOLIMS MOO TH31NI HVONOD3S HOLIMS YOLOW YHOLINOW J 084 qaq SIN3NOdINOO qaq 9 3snd 2 09 4809 AlddNS
74. lock switch and primary interlock relay causing the monitor fuse to blow POWER LEVEL P 0 TO P 90 COOKING When Variable Cooking Power is programmed the 120 volts A C is supplied to the power transformer intermittently through the contacts of relay RY 2 which is operated by the control unit within a 32 second time base Microwave power operation is as follows VARI MODE ON TIME OFF TIME Power 10 P HI 32 sec 0 sec 100 power Power 9 P 90 30 sec 2 sec approx 90 power Power 8 P 80 26 sec 6 sec approx 80 power Power 7 P 70 24 sec 8 sec approx 70 power Power 6 P 60 22 sec 10 sec approx 60 power Power 5 P 50 18 sec 14 sec approx 50 power Power 4 P 40 16 sec 16 sec approx 40 power Power 3 P 30 12 sec 20 sec approx 30 power Power 2 P 20 8 sec 24 sec approx 20 power Power 1 P 10 6 sec 26 sec approx 10 power Power 0 P 0 0 sec 32 sec 0 power Note The ON OFF time ratio does not correspond with the percentage of microwave power because approx 2 seconds are needed for heating of the magnetron filament SENSOR COOKING CONDITION for R 330AK AW Using the INSTANT SENSOR function the foods are cooked without figuring time power level or quantity When the oven senses enough steam from the food it relays the information to its microprocessor which will calculate the remaining cooking time and power level needed for best
75. losed circuit unless the temperature of the thermal cut out reaches approximately 257 F 125 C Anopen thermal cut out indicates overheating of the oven exchange the oven thermal cut out and check inside of oven cavity and for improper setting of cooking time or operation of control unit Check for restricted air flow through the vent holes of the oven cavity especially the cooling fan and air guide MAGNETRON THERMAL CUT OUT A continuity check across the thermal cut out terminals should indicate a closed circuit Ifthe temperature of the magnetron reaches approximately 203 F 95 C the thermal cut out opens The thermal cut out resets automatically below approximately 167 F 75 C An open thermal cut out indicates overheating of the magnetron Check for restricted air flow to the magnetron especially the cooling fan air guide CAUTION IF THE THERMAL CUT OUT INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE REPLACE THERMAL CUT OUT SECONDARY INTERLOCK SWITCH AND DOOR SWITCH TEST Isolate the switch and connect the ohmmeter to the common COM and normally open NO terminal of the switch The meter should indicated an open circuit with the door open and a closed circuit with the door closed If improper operation is indicated replace the secondary interlock switch PRIMARY INTERLOCK SYSTEM TEST DOOR SENSING SWITCH Isolate the switch and connect the ohmmeter to the common COM and normally open NO terminal ofthe switch The
76. ng label R 330AK R 310AK R 330AK R 330AW PART NO DESCRIPTION Q TY SPCNC382WRRO Rating label R 330AW LABMA532WRRO Menu label SCREWS NUTS AND WASHERS 8mm 6mm 8mm 12mm 12mm 12mm 8mm R 330AK 8mm R 330AW 1 1 XFPSD40P08K00 XFPSD30P06000 XHTSD40P08RVO XHTSD40P12RVO XOTSD40P12RVO XOTSD40P12000 XOTSF40P08000 0 5 40 08000 ANA B GS uS US x xx 1 2 4 5 7 7 HOW ORDER REPLACEMENT 5 To have your order filled promptly and correctly please furnish the following information 1 MODEL NUMBER 2 REF NO 3 PART NO 4 DESCRIPTION Order Parts from the authrized SHARP parts Distributor for your area Defective parts required return should be returned as indicated in the Service Policy 42 R 310AK R 330AK R 330AW OVEN AND CABINET PARTS R 330AK AW for the oven from Oct 1996 production 43 R 310AK R 330AK R 330AW 3 Before attaching Control unit to Control panel Foil side of Control unit must be cleaned by ethyl alcohol 44 310 R 330AK R 330AW PACKING AND ACCESSORIES DOOR PROTECTION SHEET SPADPA204WREO
77. oblems caused by defective control unit a Buzzer does not sound or continues to sound b Clock does not operate properly c Cooking is not possible Note When defective components the Control Unit or Key Unit are replaced 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 13 R 310AK R 330AK R 330AW TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST K KEY UNIT TEST If the display fails to clear when the STOP CLEAR is depressed first verify the flat ribbon is making good contact verify that the door sensing switch stop switch operates properly that is the contacts are closed when the door is closed and open when the door is open If the door sensing switch stop switch is good disconnect the flat ribbon cable that connects the key unit to the control unit and make sure the door sensing switch is closed either close the door or short the door sensing switch connecter Use the Key unit matrix indicated on the control panel schematic and place a jumper wire between the pins that correspond to the STOP CLEAR pad making momentary contact If the control unit responds by clearing with a beep the key unit is faulty and must be replaced If the control unit does not respond it is a faulty and must be replaced If a specific pad does not respond the above method may be used after clearing the control unit to
78. ocket POSITIVE LOCK CONNECTOR NO CASE TYPE REMOVAL Push the of positive connector Pull down on the positive lock connector CAUTION WHEN YOU CONNECTING THE POSITIVE Q N LOCK CONNECTORS TO THE TERMINALS INSTALL THE POSITIVE LOCK SO THAT THE LEVER FACES YOU Terminal Positive lock connector 8 Push Lever Pull down Figure C 3 Positive lock connector CONTROL PANEL ASSEMBLY REMOVAL Disconnect oven from power supply and remove outer case Discharge high voltage capacitor Disconnect wire leads from the door sensing switch and the oven cavity front flange Disconnect the wire leads from panel components Make one 1 tab of the oven cavity front plate straight holding the control panel assembly to the oven flange Slidethe control panel assembly upward and remove it Now individual components can be removed NOTE 1 Beforeattaching anew key unit wipe off remaining adhesive on the control panel frame surfaces completely with a soft cloth soaked in alcohol 2 When attaching the key unit to the control panel frame adjust the upper edge and right edge of the key unitto the correct position of control panel frame 3 Stickthe key unit firmly to the control panel frame by rubbing with soft cloth not to scratch TURNTABLE MOTOR REMOVAL Disconnect oven from power supply Remove turntable and turntable
79. on frequency input setting The internal clock frequency is by inserting the ceramic filter oscillation circuit with respect to OCS1 terminal Internal clock oscillation frequency control output Output to control oscillation input of OCS2 Auto clear terminal Signal is input to reset the LSI to the initial state when power is applied Temporarily set to L level the moment power is applied at this time the LSI is reset Thereafter set at level Connected to GND Signal coming from touch key When either G12 line on key matrix is touched a corresponding signal out of P24 P27 P33 P34 P35 and P36 will be inputinto P20 When no key is touched the signalis held at H level Signal similar to P20 When either G11 line on key matrix is touched a corresponding signal will be input into P21 Signal similar to P20 When either G10 line on key matrix is touched a corresponding signal will be input into P22 Signal similar to P20 When either G9 line on key matrix is touched a corresponding signal will be input into P23 Key strobe signal Signal applied to touch key section A pulse signal is input to P20 P23 terminal while one of G8 line keys on key matrix is touched Key strobe signal Signal applied to touch key section A pulse signal is input to P20 P23 terminal while one of G7 line keys on key matrix is touched Key strobe signal
80. or thermocouple through the water until the maximum temperature is recorded 4 Subtract the cold water temperature from the hot water temperature The normal result should be 34 7 to 64 6 F 19 3 to 35 9 C rise in temperature If the water temperatures are accurately measured and tested for the required time period the test results will indicate if the magnetron tube has low power output low rise in water temperature which would extend cooking time or high power output high rise in water temperature which would reduce cooking time Because cooking time can be adjusted to compensate for power output the magnetron tube assembly should be replaced only if the water temperature rise test indicates a power output well beyond the normal limits The test is only accurate if the power supply line voltage is 120 volts and the oven cavity is clean B POWER TRANSFORMER TEST DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING Disconnect the primary input terminals and measure the resistance ofthe transformer with an ohmmeter Check for continuity of the coils with an ohmmeter On the R x 1 scale the resistance of the primary coil should be less than 1 ohm and the resistance of the high voltage coil should be approximately 77 5 ohms for R 330AK AW 86 5 ohms for R 310AK the resistance of the filament coil should be less than 1 ohm HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL SO DO NOT ATTEMPT TO MEAS
81. power unit make i sure both the CPU unit and power unit are parallel as shown figure C 9 Figure C 10 CPU unit WARNING FOR WIRING To prevent an electric shock take the following manners 1 Before wiring 1 Disconnect the power supply 2 Open the door and wedge the door open 3 Discharge the high voltage capacitor and wait for 60 seconds 1 High voltage parts Magnetron High voltage transformer High voltage capacitor and High voltage rectifier assembly Hot parts Oven lamp Magnetron High voltage transformer and Oven cavity Sharp edge Bottom plate Oven cavity Weveguide flange Chassis support and other metallic plate Movable parts to prevent a fault Fan blade Fan motor Switch Switch lever Open button 3 Do not catch the wire leads in the outer case cabinet 4 Insert the positive lock connector certainly until its pin is locked And make sure that the wire leads should not come off even if the wire leads is pulled 5 To prevent an error function connect the wire leads correctly referring to the Pictorial Diagram 2 3 4 310 R 330AK R 330AW 1 56 941614 ssausey uloq pue OFHMZZSAZA M4 990 se owes y 1 Jo Jequinu sued au 3LON AuVINIHd
82. pply cord TOUCH CONTROL PANEL Interactive Display Words will light in the display to CUSTOM indicate features and cooking instructions Always follow the instructions Smart amp Easy Sensor Cooking FROZEN FOFCORN DINNER REHEAT BAKED BAKED RICE SOUP FRESH FRESH FROZEN HARD SOFT VEG FISH SEAFOOD MEAT DOG COMPU COMPU MINUTE COOK DEFROST PLUS 1 2 3 4 5 7 amp 9 O CEN a STOP CLEAR START TOUCH ON R 33AK R 330AW MN 1 Time display ON DEF LBS QTY CHEK Indicator INSTANT ACTION To adjust quantity touch pad again POPCORN BEVERAGE DINNER REHEAT PLATE CASSEROLE BAKED FRESH POTATO VEGETABLE FRESH FROZEN ROLL MUFFIN ROLL MUFFIN 1 Ground meat 2 Steaks chops 3 Chicken pieces POWER LEVEL STOP CLEAR MINUTE PLUS R 310AK R 310AK R 330AK R 330AW OPERATION DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions during oven operation OFF CONDITION Closing the door activates door sensing switch and second ary interlock switch In this condition the monitor switch contacts are opened When oven is plugged in 120 volts A C is supplied to the control unit Figure O 1 for and R
83. r and ANO terminal of the LSI The voltage of AN1 terminal will indicate about 2 5V This initial balancing is set up about 16 seconds after the unit is put in the Sensor Cooking mode As the sensor cooking proceeds the food is heated to generate moisture by which the resistance balance of the bridge circuit is deviated to increase the voltage available at AN1 terminal of the LSI Then the LSI observes that voltage at AN1 terminal and compares it with its initial value and when the comparison rate reaches the preset value fixed for each menu to be cooked the LSI causes the unit to stop sensor cooking thereafter the unit goes in the next operation automatically When the LSI starts to detect the initial voltage at AN1 terminal 16 seconds after the unit has been put in the Sensor Cooking mode if it is not possible to balance of the bridge circuit due to disconnection of the absolute humidity sensor ERROR will appear on the display and the cooking is stopped 1 Absolute humidity sensor circuit IC2 IZA495DR 1 C Thermistor in closed vesss 1 S Thermistor in open vessel 1 o 15V 310 R 330AK R 330AW SERVICING 1 Precautions for Handling Electronic Components This unit uses CMOS LSI in the integral part of the circuits When handling these parts the following precautions should be strictly followed CMOS LSI have extremely high impedance at its input and output terminals Fo
84. r for any service test or inspection within the microwave generating compartments check the magnetron wave guide 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 this 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 BEFORE SERVICING Before servicing an operative unit perform a microwave emission check as per the Microwave Measurement Procedure outlined in this service manual If microwave emissions level is in excess of the specified limit contact SHARP ELECTRONICS CORPO RATION immediately 1 800 237 4277 If the unit operates with the door open service person should 1 tell the user not to operate the oven and 2 contact SHARP ELECTRONICS CORPORATION and Food and Drug Administration s Center for Devices and Radiological Health immediately Service personnel should inform SHARP ELECTRONICS CORPORATION of any certified unit found with emissions in excess of 4mW cm The owner of the unit should be instructed not to use the unit until the oven has been brought into compliance PROCEDURE LETTER J 310 R 330AK R 330AW TEST PROCEDURES
85. r they continue to light up e Wrong figure appears f A certain group of indicators do not light up g 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 Clock does not operate properly C Cooking is not possible Note When defective components the Power Unit or Key Unit are replaced 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 RELAY TEST Remove the outer case and check voltage between Pin No 3 of the 2 pin connector A and the common terminal of the relay RY2 on the control unit with an A C voltmeter The meter should indicate 120 volts if not check oven circuit RY1 and RY2 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 R 330AK AW R 310AK RY1 Approx 24 5V D C Approx 14 0 D C Oven lamp Turntable motor Cooling fan motor RY2 Approx 24 0V D C Approx 12 8 D C Power transformer 310 R 330AK R 330AW PROCEDURE LETTER N TEST
86. r this reason it is easily influenced by the surrounding high voltage power source static electricity 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 and transporting thoroughly wrap them 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 2 Shapes of Electronic Components Transistor 2SA933S Transistor DTA123ES 2SB1238 DTA143ES B KRA101M KRC243M B E 3 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 panelis available either from the power line of the oven itself or from an external power source 1 Servicing the touch control panel with power supply of the oven CAUTION THE HIGH VOLTAGE TRANSFORMER OF THE MICROWAVE OVEN IS STILL LIVE DURING SERVICING PRESENTS A HAZARD Therefore when checking the performance of the 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 transformer to turn it off the end of such connector must be insulated with an insulating tape After servic
87. rew ADD 1 XCPSD40PO8WN 1997 6 8 Instruction book TCADCA610WRRO 1 TCADCA631W C Jan 1997 7 2 Screw XFPSD30P06000 2 XFPSD30P06 3 D Jan 1997 2 8 Screw XHTSD40PO8RVO 4 XHTSD40P08 3 D Jan 1997 235 Screw XOTSD40P12RV0 10 XOTSD40P12 9 D Jan 1997 7 6 Screw XOTSD40P12000 12 XOTSD40P12 14 C 0 1996 20 310 R 330AK R 330AW OVEN AND CABINET PARTS FOR R 330AK AW R 310AK R 330AK R 330AW CAPACITOR 97 SHARP CORP 1K4 160E Printed in U S A 22 310 SHARP SERVICE MANUAL MICROWAVE OVEN MODELS R 310AK R 330AK R 330AW condition and only parts identical to those specified should be used TABLE OF CONTENTS Page PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICE TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY INSIDE FRONT COVER BEFORE SERVICING 1 MICROWAVE MEASUREMENT PROCEDURE n 2 POREWORD 3 PRODUCT SPECIFICATIONS ats G 4 GENERAL INFORMATION e rer a E EE E E EE E A E 4 OPERATION haypaq au ay aya ukta Aa aut n aa awa y 6 TROUBLESHOOTING
88. ry interlock switch remain closed with the oven door open and when the monitor switch closes 2 If the wire harness or electrical components short circuited this monitor fuse blows to prevent an electric shock or fire hazard OVEN THERMAL CUT OUT The thermal cut out located on the top of the oven cavity is designed to prevent damage to the oven by fire If the foods load is overcooked by either error in cook time or defect in the control unit the thermal cut out will open Under normal operation the oven thermal cut out remains closed However when abnormally high temperatures are reached within the oven cavity the oven thermal cut out will open at 257 F 125 C causing the oven to shut down MAGNETRON THERMAL CUT OUT The thermal cut out located near the magnetron is designed to prevent damage to the magnetron if an over heated condition develops in the tube due to cooling fan failure obstructed air guide dirty or blocked air intake etc Under normal operation the thermal cut out remains closed However when abnormally high temperatures are reached within the magnetron the thermal cut out will open at 203 F 95 C causing the oven to shut down when the magnetron has cooled to 167 F 75 C the thermal cut out closes and cook cycle will resume TROUBLESHOOTING GUIDE When troubleshooting the microwave oven it is helpful to follow the Sequence of Operation in performing the checks Many of the possible cause
89. s LSI signal Pin No LCD Pin LSI signal Pin LCD Pin No 5 SEG 11 79 SEG 10 80 R 310AK R 330AK R 330AW Description Terminal not used Segment data signal Signal similar to SEG27 SEG15 Terminal not used SEG14 SEG8 Segment data signal Signal similar to SEG27 SEG7 Terminal not used SEG6 SEG0 Segment data signal Signal similar to SEG27 VCC VREF Connected to GND AVSS Connected to VC COM3 Common data signal Connected to LCD Pin No COM2 Common data signal COM2 Connected to LCD Pin No C1 data signal Connected to LCD Pin 2 COM0 Common data signal COM0 Connected to LCD Pin No C3 VL3 VL2 Power source voltage input terminal Standard voltage for LCD C2 Terminal not used LSI IZA758DR R 310AK The I O signal of the LSI IZA758DR is detailed in the following table Segment data signal Connected to LCD The relation between signals are as follows LSI signal Pin No LCD Pin No LSI signal Pin No LCD Pin No SEG 6 7 SEG 7 8 SEG 8 9 9 10 SEG 10 11 SEG 11 12 Signal coming from touch key When either G12 line on key matrix istouched a corresponding signal out of R73 R81 R83 and R90 R91 will be input into R60 When no key is touched the signal is held at level 61
90. s of trouble will require that a specific test be performed These tests are given a procedure letter which will be found in the Test Procedure section IMPORTANT Ifthe oven becomes inoperative because of a blown monitor fuse check the monitor switch primary interlock relay door sensing switch and secondary interlock switch before replacing the monitor fuse If monitor fuse is replaced the monitor switch must also be replaced Use FFS BA012WRKO as an assembly R 310AK R 330AK R 330AW CK Check RE Replace TEST PROCEDURE Home fuse or circuit breaker blows when power cord is plugged into wall receptacle Monitor fuse blows when power cord is plugged into wall recepta OFF cle CONDITION All letters and indicators do not appear in display when power cord is first plugged into wall out let Display does not operate prop erly when STOP CLEAR key is touched Buzzer should sound and or time of day should ap pear in display Oven lamp does not light when door is opened POSSIBLE CAUSE AND DEFECTIVE PARTS SECONDARY INTERLOCK SWITCH MONITOR SWITCH MONITOR FUSE OVEN LAMP OR SOCKET HIGH VOLTAGE CAPACITOR PRIMARY INTERLOCK SYSTEM SHORT OR OPENED WIRING THERMAL CUT OUT MAGNETRON H V RECTIFIER ASSEMBLY SHORT IN POWER CORD FOIL PATTERN ON PWB OUTER CASE SWITCH POWER TRANSFORMER COOLING FAN MOTOR TURNTABLE MOTOR LOW VOLTAGE DIRTY OVEN CAVITY COMPU DEFROST AH SENSOR TOUCH
91. sing the A D converter contained in the LSI DC voltage in accordance with the Model in operation is applied to set up its cooking constant Terminal not used To input signal which communicates the door open close information to LSI Door closed level signal OV Door opened level signal 5V AH sensor input This input is an analog input terminal from the AH sensor circuit and connected to the A D converter built into the LSI Used for initial balancing of the bridge circuit absolute humidity sensor This input is an analog input terminal from the AH sensor circuit and connected to the A D converter built into the LSI P57 P55 Terminal not used P54 Signal to sound buzzer 2 0 2 A key touch sound B Completion sound P53 P50 Terminal not used P47 P43 Used for initial balancing of the bridge circuit absolute humidity sensor INTO Signal synchronized with commercial power source frequency This is basic timing for time processing of LSI 16 7 msec P41 P40 Terminal not used Signal coming from touch key When either G12 line on key matrix is touched a corresponding signal out of P20 P27 will be input into P77 When no key is touched the signal is held at level Signal similar to P77 When either G11 line on key matrix is touched a corresponding signal will be input into P76 Signal similar to P77 When
92. support from oven cavity Lay the oven on it s backside Remove the turntable motor cover by snipping off the material in four corner Where the corners have been snipped off bend corner areas flat No sharp edge must be evident after removal of the turntable motor cover 25 5 Disconnect wire leads from turntable motor See Positive lock connector removal Remove two 2 screws holding turntable motor to oven cavity Now the turntable motor is free After replacement use the one 1 screw to fit the turntable motor cover R 310AK R 330AK R 330AW 7 8 9 COOLING MOTOR REMOVAL Disconnect oven from power supply and remove outer case Discharge high voltage capacitor Disconnect the wire leads from the fan motor Remove one 1 screw holding the chassis support to magnetron And remove chassis support Release the snap of the main wire harness from the fan duct Remove 1 screw holding the fan duct assembly to oven cavity Release the main wire harness from the hole of the fan duct Release the fan duct from the waveguide flange Release the fan duct assembly from the oven cavity 10 Remove the fan blade from the fan motor shaft according 1 the following procedure Holdthe edge ofthe rotor of the fan motor by using a pair of grove joint pliers CAUTION 2 3 sure that pieces do not enter
93. t A continuity check across the magnetron filament leads should indicate less than 1 ohm To test fora shorted magnetron connect the ohmmeter leads between the magnetron filament leads and chassis ground This test should indicate an infinite resistance If there is little or no resistance the magnetron is grounded and must be replaced Power output of the magnetron can be measured by performing a water temperature rise test This test should only be used if above tests do not indicate a faulty magnetron and there is no defect in the following components or wiring silicon rectifier high voltage capacitor and power transformer This test will require a 16 ounce 453cc measuring cup and an accurate mercury thermometer or thermocouple type temperature tester For accurate results the following procedure must be followed carefully 1 Fillthe measuring cup with 16 oz 453cc of tap water and measure the temperature of the water with a thermometer or thermocouple temperature tester Stir the thermometer or thermocouple through the water until the temperature stabilizes Record the temperature of the water 2 Place the cup of water in the oven Operate oven at POWER 10 HIGH selecting more than 60 seconds cook time Allow the water to heat for 60 seconds measuring with a stop watch second hand of a watch or the digital read out countdown j 3 Remove the cup from the oven and again measure the temperature making sure to stir the thermometer
94. tallation 1 Insert the receptacle into terminal insulator 2 Close covers of the terminal insulator as shown below COVERS K RECEPTACLE REMOVAL insulator screw driver Removal 1 Disconnect oven from power supply and remove outer case Discharge high voltage capacitor Disconnect wire leads from magnetron Remove the one 1 screw holding chassis support to magnetron Remove the chassis support from oven Remove the one 1 screw holding the magnetron air guide to the magnetron 7 Carefully remove the two 2 screws holding magnetron to waveguide flange 8 Lift up magnetron with care so that magnetron antenna is not hit by any metal object around antenna 9 Now the magnetron is free Re install 1 Re install the magnetron to waveguide flange with the two 2 screws diagonally as shown in Figure C 1 2 Re install the magnetron air guide to magnetron with the one 1 screw 3 Insert the two 2 tabs of the chassis support to the oven front plate and the plate 4 Re installthe chassis supportto magnetron with the one 1 screw 5 Reconnect the wire leads to the magnetron Refer to PICTORIAL DIAGRAM on page 29 30 6 Re installoutercase andcheckthatthe 15 operating properly CAUTION WHEN REPLACING MAGNETRON BE SURE THE R F GASKET IS IN PLACE AND MOUNT ING SCREWS ARE TIGHTENED SECURELY Y scre
95. tes smooth after installation Make sure that the axis of the shaft is not slanted Catch three holes of fan duct on three tabs of the waveguide Install the fan duct assembly to the oven cavity with the one 1 screw Insertthe snap of the main wire harness to the hole of the fan duct and insert the main wire harness into the hole of the fan duct Install one 1 tab of the chassis support to oven cavity front plate and install another tab of it to rear plate And then screw chassis support to magnetron with one 1 screw 7 Connect the wire leads to the fan motor referring to the fa fa pictorial diagram d Groove joint pliers O 5 O Pi m are the position Gap Axis Ala where should be Table P tar ef pinched with pliers Rotor Stator 77 77 Rotor Rear View Side View DOOR SENSING SWITCH SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH REMOVAL Disconnect oven from power supply and remove outer case Discharge high voltage capacitor Disconnect wire leads from the switches Remove two 2 screws holding latch hook to oven flange Remove latch hook assembly from oven flange Push outward on the two 2 retaining tabs holding switch in place Switch is now free At this time switch lever will be free do not lose it 26
96. the between the rotor and the stator of the fan motor because the rotor is easily shaven by pliers and metal pieces may be produced Do not touch the pliers to the coil of the fan motor because the coil may be cut or injured Do not disfigure the bracket by touching with the pliers Remove the fan blade from the shaft of the fan motor by pulling and rotating the fan blade with your hand Now the fan blade will be free CAUTION Coil Stator Do not reuse the removed fan blade because the hole for shaft may be larger than normal 1 1 1 Remove the two 2 screws holding the fan motor to the fan duct 2 the fan motor is free INSTALLATION 1 Install the fan motor to the fan duct with the two 2 screws Install the fan blade to the fan motor shaft according the following procedure Hold the center of the bracket which supports the shaft of the fan motor on the flat table lt 2 Apply the screw lock tight into the hole for shaft of the 3 fan blade Install the fan blade to the shaft of fan motor by pushing the fan blade with a small light weight ball peen hammer or rubber mallet CAUTION Do not hit the fan blade strongly when installed because the bracket may be disfigured Make sure that the fan blade rota
97. the bridge circuit is to be amplified by the operational amplifier Each thermistor is supplied with a current to keep it heated at about 150 C 302 F the resultant heat is dissipated the air and if the two thermistors are placed in different humidity conditions they show different degrees of heat conductivity leading to a potential difference between them causing an output voltage from the bridge circuit the intensity of which is increased as the absolute humidity of the air increases Since the output is very minute it is amplified by the operational amplifier ventilation opening for sensing Absolute humidity vs Operational output voltage characterist R1 amplifier Output voltage Output voltage S Thermistor open vessel Thermistor closed vessel Absolute humidity g m 3 Detector Circuit of Absolute Humidity Sensor Circuit This detector circuit is used to detect the output voltage of the absolute humidity circuit to allow the LSI to control sensor cooking of the unit When the unitis setin the sensor cooking mode 16 seconds clearing cycle occurs than the detector circuit starts to function and the LSI observes the initial voltage available at its AN1 terminal With this voltage given the switches SW1 to SW5 the LSI are turned on in such a way as to change the resistance values in parallel with R107 R111 Changing the resistance values results in that there is the sam
98. to the gap between the door stopper and the choke cover to free engaging parts as shown in Figure C 6 27 Try the principles of the lever and lift up the door stopper Now the door stopper is free from the door assembly Insert an putty knife thickness of about 0 5mm into the gap between the choke cover and door frame as shown in Figure C 6 to free engaging parts Try the principles of the lever and lift up the choke cover 310 R 330AK R 330AW by inserting a putty knife as shown Figure C 6 8 Release choke cover from door panel 9 Now choke cover is free lt Door stopper Figure C 6 Door Disassembly 10 Release two 2 pins of door panel from two 2 holes of upper and lower oven hinges by lifting up 11 Now door panel with door frame is free from oven cavity 12 Release door panel from nine 9 tabs of door frame by sliding door panel downward 13 Now door panel with sealer film is free 14 Tear sealer film from door panel 15 Now door panel is free 16 Slide latch head upward and remove it from door frame with releasing latch spring from door frame and latch head 17 Now latch head and latch spring are free 18 Remove door screen from door frame by releasing two 2 tabs 19 Now door screen is free RE INSTALL 1 Re install door screen to door frame by fitting two 2 tabs of door frame to two 2 holes of door screen 2 Re install the latch spring to the latch head Re install th
99. tor ic switch reconnect the wire lead to the monitor switch eu NC terminal and check the continuity of the monitor 2 MONITOR SWITCH 2 ESN OHMMETER circuit 12 PROCEDURE LETTER H 310 R 330AK R 330AW TEST PROCEDURES COMPONENT TEST BLOWN MONITOR FUSE If the monitor fuse is blown when the door is opened check the primary interlock relay secondary interlock switch and monitor switch according to the TEST PROCEDURE for those switches before replacing the blown monitor fuse CAUTION BEFORE REPLACING A BLOWN MONITOR FUSE TEST THE PRIMARY INTERLOCK RELAY SECONDARY INTERLOCK SWITCH DOOR SENSING SWITCH AND MONITOR SWITCH FOR PROPER OPERATION If the monitor fuse is blown by improper switch operation the monitor fuse and monitor switch must be replaced with monitor fuse and monitor switch assembly part number FFS BA012WRKO even if the monitor switch operates normally The monitor fuse and monitor switch assembly is comprised of a 20 ampere fuse and switch OUTER CASE SWITCH TEST B Isolate the switch and connect the ohmmeter to the common COM and normally open NO terminal of the switch The meter should indicated an open circuit when its plunger is released and closed circuit when its plunger is pushed If improper operation is indicated replace the outer case switch TOUCH CONTROL PANEL ASSEMBLY TEST The touch control panel consists of circuits including semiconductors such
100. turn on and off shut off relay RY1 The square waveform voltage is delivered to the RY1 driving circuit and RY2 control circuit During cooking Key strobe signal Signal applied to touch key section A pulse signal is input to R60 R63 terminal while one of G8 line keys on key matrix is touched Signal synchronized with commercial power source frequency This is the basic timing for time processing of LSI 16 7 msec Key strobe signal Signal applied to touch key section A pulse signal is input to R60 R63 terminal while one of G7 line keys on key matrix is touched Key strobe signal Signal applied to touch key section A pulse signal is input to R60 R63 terminal while one of G6 line keys on key matrix is touched Key strobe signal Signal applied to touch key section A pulse signal is input to R60 R63 terminal while one of G5 line keys on key matrix is touched Key strobe signal Signal applied to touch key section A pulse signal is input to R60 R63 terminal while one of G4 line keys on key matrix is touched Key strobe signal Signal applied to touch key section A pulse signal is input to R60 R63 terminal while one of G3 line keys on key matrix is touched Terminal not used Internal clock oscillation frequency setting input The internal clock frequency is set by inserting the capacitor and resistor circuit with respect to XOUT terminal
101. uch REHEAT pad of INSTANT SENSOR once Now the oven is in the sensor cooking condition and REHEAT will appear in the display 5 The oven will operate for the first 16 seconds without generating microwave energy NOTE ERROR will appear if the door is opened or STOP CLEAR pad is touched during first stage of sensor cooking 6 After approximately 16 seconds microwave energy is produced and the display should start to count down the remaining cooking time and oven should turn off after water is boiling bubbling If the oven does not turn off replace the AH sensor or check the control unit refer to explanation below TESTING METHOD FOR AH SENSOR AND OR CONTROL UNIT To determine if the sensor is defective the simplest method is to replace it with a new replacement sensor 1 Disconnect oven from power supply and remove outer case 2 Discharge the high voltage capacitor 3 Remove the AH sensor 4 Install the new AH sensor 5 Re install the outer case 6 Reconnect the oven to the power supply and check the sensor cook operation proceed as follows 6 1 Fill approximately 200 milliliters 7 2 oz of tap water a 1000 milliliter measuring cup 6 2 Place the container on the center of tray in the oven cavity 6 3 Close the door 6 4 Touch REHEAT pad once 6 5 The control panel is in automatic Sensor operation 6 6 The display will start to count down the remaining cooking time and the oven will turn off automati
102. uency control output Output to control oscillation input of XIN Auto clear terminal Signal is input to reset LSI to the initial state when power is supplied Temporarily set L level the moment power is supplied at this time the LSI is reset Thereafter set at H level Connected to GND Signal synchronized with commercial power source frequency Signal similar to VSS Common data signal Connected to LCD Pin No C1 Common data signal COM2 Connected to LCD Pin No C2 310 R 330AK R 330AW Description Common data signal COM1 Connected to LCD Pin No C3 Terminal not used Power source voltage input terminal Connected to GND ABSOLUTE HUMIDITY SENSOR CIRCUIT R 330AK AW 1 Structure of Absolute Humidity Sensor The absolute humidity sensor includes two thermistors as shown in the illustration One thermistor is housed in the closed vessel filled with dry air while another in the open vessel Each sensor is provided with the protective cover made of metal mesh to be protected from the external airflow Thermistors Sensing part Closed vessel Sensing part Open vessel PIKE tera 2 Operational Principle of Absolute Humidity Sensor The figure below shows the basic structure of an absolute humidity sensor A bridge circuitis formed by two thermistors and two resistors R1 and R2 The output of
103. ut play of door remains less than 0 5mm when in the latched position First check upper position of latch hook pushing and pulling upper portion of door toward the oven face Then check lower portion of the latch hook pushing and pulling lower portion of the door Removal 1 5 8 9 Disconnect the oven from the power supply and remove the outer case 2 Discharge high voltage capacitor 3 4 Remove the one 1 screw holding the switch holder to the oven cavity rear plate Release the two 2 tabs of the switch holder from the two 2 holes of the oven cavity plate Release the one 1 snap of the main wire harness from the hole of the switch holder 6 Disconnect the wire leads from the outer case switches 7 Remove the switch holder outer case switch assembly from the oven cavity rear plate Push on the one 1 retaining tab holding the outer case switch Turn the outer case switch clockwise around the pole 10 Now the outer case switch is free NOTE Do not lose the actuator because it will be free after the outer case switches are removed Re install 1 Re install the actuator to the switch holder by inserting the tab of the actuator into the square hole on the switch holder as shown in Figure C 5 Re install the outer case switches to the switch holder as shown in Figure C 5 4 5 R 310AK R 330AK R 330AW DOOR SENSING SWITCH SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH ADJU
104. voltage of power source circuit input Key strobe signal Signal applied to touch key section A pulse signal is input to P74 P77 terminal while one of G8 line keys on key matrix is touched Key strobe signal Signal applied to touch key section A pulse signal is input to P74 P77 terminal while one of G7 line keys on key matrix is touched Key strobe signal Signal applied to touch key section A pulse signal is input to P74 P77 terminal while one of G6 line keys on key matrix is touched Key strobe signal Signal applied to touch key section A pulse signal is input to P74 P77 terminal while one of G5 line keys on key matrix is touched Key strobe signal Signal applied to touch key section A pulse signal is input to P74 P77 terminal while one of G4 line keys on key matrix is touched Key strobe signal Signal applied to touch key section A pulse signal is input to P74 P77 terminal while one of G3 line keys on key matrix is touched Key strobe signal Signal applied to touch key section A pulse signal is input to P74 P77 terminal while one of G2 line keys on key matrix is touched Key strobe signal Signal applied to touch key section A pulse signal is input to P74 P77 terminal while one of G1 line keys on key matrix is touched Terminal not used Terminal not used Segment data signal Connected to LCD The relation between signals are as follow
105. ws FLANGE Figure C 1 Magnetron replacement ON 310 R 330AK R 330AW HIGH VOLTAGE RECTIFIER AND HIGH VOLTAGE CAPACITOR REMOVAL Disconnect oven from power supply and remove outer case Discharge high voltage capacitor Disconnectthe high voltage wire B from the high voltage capacitor Disconnect he high voltage wire of high voltage rectifier assembly from the magnetron Remove one 1 screw holding capacitor holder to oven cavity rear plate Disconnect rectifier terminal from capacitor 7 8 High voltage rectifier assembly is now free Remove one 1 screw holding high voltage rectifier assembly to capacitor holder Remove capacitor holder Capacitor is now free CAUTION WHEN REPLACING HIGH VOLTAGE RECTI FIER AND HIGH VOLTAGE CAPACITOR GROUND SIDE TERMINAL OF THE HIGH VOLTAGE RECTIFIER MUST BE SECURED FIRMLY WITH A GROUNDING SCREW OVEN LAMP AND LAMP SOCKET REMOVAL Disconnect oven from power supply and remove outer case Discharge high voltage capacitor Bend the tab of the partition angle holding the lamp socket Lift up the oven lamp socket Pullthe wire leads from the oven lamp socket by pushing the terminal hole of the oven lamp socket with the small flat type screw driver Now the oven lamp socket is free Oven lamp Socket 22 h lt lt Flate type small screw driver hole Figure C 2 Oven lamp s

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