Sharp R-2275 Service Manual Download Page 44

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R-2275
R-2285

'93 SHARP CORP. (12S1.30E) Printed in Germany

Summary of Contents for R-2275

Page 1: ...UTION MICROWAVE RADIATION 1 WARNING 1 PRODUCT SPECIFICATIONS 2 GENERAL IMPORTANT INFORMATION 3 APPEARANCE VIEW 3 OPERATION SEQUENCE 4 FUNCTION OF IMPORTANT COMPONENTS 5 SERVICING 7 TEST PROCEDURE 10 TOUCH CONTROL PANEL ASSEMBLY 17 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE 22 MICROWAVE MEASUREMENT 27 TEST DATA AT A GLANCE 28 WIRING DIAGRAM 29 PICTORIAL DIAGRAM 31 CONTROL PANEL CIRCUIT 32 PRINT...

Page 2: ...tä käytetään tai jos se kytketään väärin Kaikkien mikroaaltoliitäntöjen sekä syöttö että ulostulopuolella aaltoputkien laippojen ja tiivisteiden tulee olla varmistettuja Mikroaaltouunnia ei koskaan saa käyttää ilman kuormaa jossa mikroaaltoenergiaa kuluu Avoimeen aaltoputkeen tai antenniin ei koskaan saa katsoa virran ollessa kytkettynä ADVARSEL MIKROBØLGESTRÅLING Personell må ikke utsettes for mi...

Page 3: ... PANEL ASSEMBLY WARNING Note The parts marked are used in volt age more than 250V Parts List Anm Delar märket med har en spänning överstigande 250V Huom Huolto ohjeeseen merkitty tähdella osat joissa jännite on yli 250 V Bemerk Deler som er merket asterisk er utsatt for spenninger over 250V til jord Bemærk Delemærketmedstjernebenyttesmed højere spænding end 250 volt WARNING Never operate the oven ...

Page 4: ...0mm Height 335 mm including foot Depth 440 mm Cooking Cavity Dimensions Width 330 mm Height 210 mm Depth 330 mm Control Complement Touch Control System Microwave Power level 100 50 20 10 Microwave power setting key Electronic timer 0 30 min Start Key Set Weight Approx 30kg R 2275 Approx 32kg R 2285 PRODUCT DESCRIPTION SPECIFICATION GENERAL INFORMATION WARNING THIS APPLIANCE MUST BE EARTHED IMPORTA...

Page 5: ...dicator OPERATING KEYS 4 Power 100 5 Power 50 MICROWAVE POWER 6 Power 20 LEVEL button 7 Power 10 8 ELECTRONIC TIMER Rotate the knob to enter cooking time 9 START button APPEARANCE VIEW CONTROL PANEL POWER ON 2 1 3 4 5 6 7 8 9 100 50 20 10 Control panel Stirrer cover Oven lamp Ceramic shelf Not removable Air intake filter Air intake openings Door Door open handle Ventilation openings Oven lamp acce...

Page 6: ...h COM NC Open Closed 2nd latch switch COM NO Closed Open Stop switch COM NO Closed Open 3rd latch switch COM NO Closed Open The circuits to the high voltage transformers T1 T2 are cut off when the 1st latch 2nd latch 3rd latch and stop switches SW1 SW2 SW3 SW5 are made open The blower motor BM and remains on even if the oven door is opened after the cooking cycle has been interrupted because the r...

Page 7: ...s are closed On opening the door each of these switches operate inversely 3 If the door is opened and the 1st latch switch contacts fail to open the fuse F2 F6 3A blows simultaneously with closing of the monitor switch contacts CAUTION BEFORE REPLACING A BLOWN FUSE F2 F6 3A TEST THE 1ST LATCH SWITCH MONI TORSWITCHANDMONITORRESISTORFOR PROPER OPERATION REFER TO CHAP TER TEST PROCEDURE MONITOR RESIS...

Page 8: ...is touched the contacts of the surge relays RY S1 RY S2 close and the surge current flows through the surge resistors R1 R2 for 200 msec after 20 msec since the START key is touched the surge relays RY S1 RY S2 closes and supply the high voltage transformer with the line voltage After 200 msec the surge relays RY S1 RY S2 open their contacts and gets out of function The surge resistors R1 R2 lets ...

Page 9: ...r 60 seconds and then short circuittheconnectionofthehigh voltagecapacitor that is of the connecting lead of the high voltage rectifier against the chassis with the use of an insulated screwdriver Sharp recommend that wherever possible fault finding is carried out with the supply disconnected It may in some cases be necessary to connect the supply after the outer case has been removed in this even...

Page 10: ...r do not work Oven does not stop after end of cooking cycle or when STOP CLEAR key is touched Oven lamp and blower motor stop Homefuseblowswhenstartingtheoven Oven goes into cook cycle but shuts down before end of cooking cycle Mi crowave power level is set at 10 Oven seems to be operating but no heat is produced in oven load Microwave power level is set at 10 It passed more than 1 minute after co...

Page 11: ...ER POWER SUPPLY CORD FUSE HOLDER SHORTED WIRE HARNESS OPENED WIRE HARNESS TOUCH CONTROL PANEL RELAY RY 1 RY 3 RY 4 FOIL PATTERN BLOCKED VENTILATION OPENINGS BLOCKED BLOWER MOTOR MIS ADJUSTMENT OF SWITCHES HOME FUSE OR BREAKER NO POWER AT WALL OUTLET OVER THE MAX COOKING TIME DUE TO PROGRAMME LOCK TEMPERATURE OF THERMISTOR EXHAUST IS HIGHER THAN 120 C TEMPERATURE OF THERMISTOR EXHAUST IS HIGHER THA...

Page 12: ... R 2275 P 180x T R 2285 P 120x T R 2275 NEVER TOUCH ANY PART IN THE CIRCUIT WITH YOUR HAND OR AN INSULATED TOOL WHILE THE OVEN IS IN OPERATION TEST PROCEDURES PROCEDURE LETTER A MAGNETRON TEST Measuring condition 1 Container The water container must be a cylindrical borosilicate glass vessel having a maximum material thickness of 3 mm and an outside diameter of approximately 190 mm 2 Temperature o...

Page 13: ... 2285 Heat up for 37 sec R 2275 1000g 1000g 1000g T1 C T2 C JUDGMENT The measured output power should be at least 15 of the rated output power CAUTION 1 C CORRESPONDS TO 180 WATTS FOR R 2285AND 120 WATTS FOR R 2275 REPEAT MEASUREMENT IF THE POWER IS INSUFFICIENT WARNING High voltages and large currents are present at the secondary winding and filament winding transformer It is very dangerous to wo...

Page 14: ...C Normally close terminal S C Short O C Open circuit CARRY OUT 3D CHECKS E SWITCH TEST D HIGH VOLTAGE CAPACITOR TEST CARRY OUT 3D CHECKS A Isolate the high voltage capacitor from the circuit B Continuity check must be carried out with measuring instrument which is set to the highest resistance range C A normal capacitor shows continuity for a short time kick and then a resistance of about 10MΩ aft...

Page 15: ...er Parts Name condition closed circuit condition open circuit When room temperature C C is approx 20 C Oven temp fuse 150 C This is not resetable type Above 150 C Closed circuit Thermal cut out 145 C Below 20 C Above 145 C Closed circuit Thermal cut out 115 C Below 20 C Above 115 C Closed circuit If incorrect readings are obtained replace the temp fuse or thermal cut out An open circuit oven temp ...

Page 16: ...KS Disconnect connector B from the CPU unit Measure the resistance of the thermistor with an ohmmeter Connect the ohmmeter leads to the leads of the thermistor Room Temp 20 C 30 C Resistance Approx 61 5kΩ 39 5kΩ If the meter does not indicate above resistance replace the thermistor CARRY OUT 4R CHECKS THERMISTOR AIR INTAKE TEST CARRY OUT 3D CHECKS Disconnect connector H from the CPU unit Measure t...

Page 17: ...n produces no signal 2 Control Unit The following symptoms may indicate a defective control unit Replacing the control unit 2 1 Programming problems a When touching the select buttons a certain group of buttons do not produce a signal 2 2 Display problems a For a certain digit all or some segments do not light up b For a certain digit brightness is low c Only one indicator does not light d The cor...

Page 18: ...nector A on the control unit with an A C voltmeter The meter should indicate 220 230 volts if not check control unit circuity RY1 RY2 and RY3 Relay Test These relays are operated by D C voltage Check voltage at the relay coil with a D C voltmeter during the microwave cooking operation DC voltage indicated Defective relay DC voltage not indicated Check diode which is connected to the relay coil If ...

Page 19: ...or driving output relay by IC1 output 10 Stop Switch Circuit This is a circuit for driving IC1 to detect door opening closing 11 Exhaust Gas Temperature Detecting Circuit This is a circuit for transmitting output change of ther mistor Temperature Sensor to IC1 12 High Voltage Monitoring Circuit This circuit detects problems in the magnetron high voltage circuit by sensing a variation in the curren...

Page 20: ... P55 OUT Power supply output at thermistor detecting circuit Output 5V in cooking only but apply high impedance to others to prevent thermistor from electrolytic corrosion ocurrence 14 P54 OUT Terminal not used 15 P53 OUT Surge limiting relay driving signal The surge limiting relay is designed to turn on 20 msec earlier than the cook relays RY2 RY3 16 P52 OUT Terminal not used 17 P51 IN Signal com...

Page 21: ...The Square waveform voltage is delivered to the RY1 relay driving circuit and relays RY2 RY3 COOK RELAY control circuit 34 P26 OUT Terminal not used 35 36 P25 P24 OUT Magnetron high voltage circuit driving signal To turn on and off the cook relay In100 power level operation L level during cooking H level otherwise In other power level operation 50 20 or10 H and L level is repeated according to pow...

Page 22: ...nel by using the dummy resistor s 4 Servicing Tools Tools required to service the touch control panel as sembly 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 f...

Page 23: ... SLIDE DOWN DURING REMOVAL THIS MAY CAUSE DAMAGE TO THE CONTROL UNIT BY HITTING A RELAY RY 3 OR THE TAB TERMINALS LOCATED AT THE FRONT OF THE OVEN CAVITY 2 If the Touch Control Panel is hard to remove 1 Insert a flat head screw driver into space B Fig 1 2 Rotate the screwdriver clockwise while holding position C of the Touch Control Panel Fig 2 CAUTION TO AVOID DAMEGE TO TOUCH CONTROL PANEL COVER ...

Page 24: ...RECTIFIER ASSEMBLY 2 WHEN REPLACING HIGH VOLTAGE RECTIFIER ASSEMBLY ENSURE THAT THE CATHODE EARTH CONNECTION IS SECURELY FIXED TO THE CHASSIS WITH A EARTHING SCREW 6 Remove the H V cover from the two 2 high voltage capacitors 7 Now the two 2 high voltage capacitors are free HIGH VOLTAGE COMPONENTS REMOVAL High Voltage Capacitor and High Voltage Rectifier Assembly To remove the components proceed a...

Page 25: ...the bottom plate 18 Remove the high voltage transformer Now the high voltage transformer is free CAUTION WHEN THE NEW BLOWER MOTOR IS IN STALLED TWO PURSE LOCKS MUST BE FITTED IN IT BECAUSE IT DOES NOT HAVE ANY PURSE LOCKS Figure C 1 Oven lamp socket CONTROL PANEL ASSEMBLY REMOVAL CONTROL ASSEMBLY 1 Disconnect the oven from the power supply 2 Remove the air intake filter assembly from the bottom p...

Page 26: ... have not activated with the door closed loose two 2 screws holding latch hook and adjust the latch hook position After adjustment make sure of the following 1 The stop switch and 1st 2nd 3rd latch switches inter rupt the circuit before the door open when the door release lever is pulled and then and monitor switch close the circuit when the door is opened 2 Re install outer case and check for mic...

Page 27: ... Choke Cover Removal DOOR COMPONENTS REMOVAL Remove the door assembly referring to from item 1 through item 3 of DOOR REPLACEMENT 1 Place the door assembly on a soft cloth with facing up UPPER AND LOWER OVEN HINGE REMOVAL 2 Remove the choke cover referring to CHOKE COVER REMOVAL 3 Release the oven hinges from the door panel 4 Now the oven hinges are free DOOR HANDLE REMOVAL 5 Remove the two 2 scre...

Page 28: ...ngle 1 special screw holding the exhaust cover A to the rear cabinet using the special driver LHSTIX DLR4 100T 2 Release the tab of the exhaust cover A from the hole of the rear cabinet and remove the exhaust cover A 3 Now the exhaust cover A is free Exhaust cover B 1 Remove the single 1 special screw holding the exhaust cover B to the rear cabinet using the special driver LHSTIX DLR4 100T 2 Relea...

Page 29: ... microwave ovens must be used for testing Recommended instruments are mW cm 2 mW cm 2 Microwave leakage measurement at 5 cm distance SHARP NARDA 8100 NARDA 8200 HOLADAY HI 1500 SIMPSON 380M 2 Place the oven tray into the oven cavity 3 Place the load of 275 15ml of water initially at 20 5 C in the centre of the oven tray The water container should be a low form of 600 ml beaker with inside diameter...

Page 30: ...or C2 1 07µF R 2285 0 94µF R 2275 AC 2100V High voltage transformer T1 Filament winding 1Ω Secondary winding Approx 83Ω R 2285 98Ω R 2275 Primary winding Approx 1 3Ω R 2285 1 5Ω R 2275 High voltage transformer T2 Filament winding 1Ω Secondary winding Approx 83Ω R 2285 98Ω R 2275 Primary winding Approx 1 3Ω R 2285 1 5Ω R 2275 Magnetron MG1 Filament winding 1Ω Filament winding chassis Ω Magnetron MG...

Page 31: ... BLU 15 BRN 15 N L G Y 15 EARTH 0 22µ AC250V NOISE SUPPRESSION COIL F1 Special fuse 13A NOISE FILTER 10M 0 5W 680K 0 5W 0 0047µ AC250V 0 0047µ AC250V SW1 1ST LATCH SWITCH PRIMARY INTERLOCK SWITCH SW4 MONITOR SWITCH R3 MONITOR RESISTOR 4 3 20W TC3 BLOWER MOTOR THERMAL CUT OUT 115C A7 A5 TF OVEN TEMP FUSE 150C F2 FUSE F6 3A 250V SW2 2ND LATCH SWITCH WP1 Fuse M6 3A A3 TC1 MG THERMAL CUT OUT 145C TC2 ...

Page 32: ...5 220 230V 50Hz BLU 15 BRN 15 N L G Y 15 EARTH 1µ AC250V NOISE SUPPRESSION COIL F1 Weak point A017 NOISE FILTER 10M 0 5W 680K 0 5W 0 0047µ AC250V 0 0047µ AC250V SW1 1ST LATCH SWITCH PRIMARY INTERLOCK SWITCH SW4 MONITOR SWITCH R3 MONITOR RESISTOR 4 3 20W TC3 BLOWER MOTOR THERMAL CUT OUT 115C A7 A5 TF OVEN TEMP FUSE 150C F2 FUSE F6 3A 250V SW2 2ND LATCH SWITCH WP1 WeeK point A018 A3 TC1 MG THERMAL C...

Page 33: ...SYMMETRIC RECTIFIER H V RECTIFIER ASYMMETRIC RECTIFIER C2 H V CAPACITOR C2 H V CAPACITOR PNK WHT THERMISTOR EXHAUST YLW WHT CAUTION Connect the white lead to the side contact of the oven lamp socket OL OVEN LAMP OVEN LAMP SOCKET BLK BLK WP1 WEAK POINT OR FUSE RED BLK 1 3 2 TF OVEN TEMP FUSE RED RED WP2 WEAK POINT OR FUSE TC1 MG THERMAL CUT OUT TC2 MG THERMAL CUT OUT B L K B L K R E D R E D F2 FUSE...

Page 34: ...J4 J3 J2 J1 VA R61 47K R60 47K C60 0 01µ 25V FAN LOCK THERMISTOR DOOR SW THERMISTOR SURGE RELAY H3 H1 B1 B2 B3 B4 B5 Q70 DTA143ES R70 3 3K SP1 R62 330 1W D50 R50 100 C50 D20 MPG06G D24 Q24 DTB143ES R40 4 7KF R41 30KF R42 3 3K IF NOT SPECIFIED 1SS270A IF NOT SPECIFIED 1 4W 5 IF NOT SPECIFIED 0 01µ 16V TAB4 TAB3 TAB2 TAB1 A1 A3 A5 A7 OVEN LAMP FAN MOTOR AC220 230V 50HZ MICRO 1 MICRO 2 D31 R33 1K D30...

Page 35: ...J2 J1 VA R61 47K R60 47K C60 0 01µ 25V FAN LOCK THERMISTOR DOOR SW THERMISTOR SURGE RELAY H3 H1 B1 B2 B3 B4 B5 Q70 DTA143ES R70 3 3K SP1 R62 330 1W D50 R50 100 C50 D20 MPG06G D24 Q24 DTB143ES R40 4 3KF R41 27KF R42 3 3K IF NOT SPECIFIED 1SS270A IF NOT SPECIFIED 1 4W 5 IF NOT SPECIFIED 0 01µ 16V TAB4 TAB3 TAB2 TAB1 A1 A3 A5 A7 OVEN LAMP FAN MOTOR AC220 230V 50HZ MICRO 1 MICRO 2 D31 R33 1K D30 R32 1...

Page 36: ...5 30 32 3 R85 R84 2 J11 CN E IC1 R62 R81 R80 B Q60 E J10 3 1 R82 R83 C6 Q2 E C81 C80 1 5 R42 R63 CN J CN H R61 3 1 C60 R3 R4 R60 ZD2 D60 R51 CF1 4 C7 C5 7 R41 C50 R50 D50 R10 R37 R36 5 6 C20 D32 D33 R2 B E Q24 1 2 3 R40 CN B DOOR SW D24 E Q23 E Q22 4 5 9 10 8 C3 E Q70 B 11 R22 J22 C4 Q20 B R1 Q1 E R70 SP1 ZD1 C12 13 C11 B B 12 B B E C2 C8 Q10 C10 14 C21 R20 15 C1 D22 Q21 E B R34 R30 D30 R32 C30 CN...

Page 37: ...Q T2 RTRN A397WRE0 High voltage transformer R 2285 1 BQ TC1 RTHM A037WRE0 Magnetron thermal cut out 145 C 1 AG TC2 RTHM A037WRE0 Magnetron thermal cut out 145 C 1 AG TC3 RTHM A058WRE0 Blower motor thermal cut out 115 C 1 AG TF FFS TA001WRK0 Oven temp fuse 150 do C assembly 1 AL 1 1 DH HZA006WRK0 Thermistor assembly 1 AN 1 2 QACCVA060WRE0 Power supply cord 1 BG 1 3 QFSHDA002WRE0 Fuse holder 3 AF 1 ...

Page 38: ...stor 1 8k ohm 1 4W 1 AA R2 VRD B12HF561J Resistor 560 ohm 1 2W 1 AA R3 VRD B12EF102J Resistor 1 0k ohm 1 4W 1 AA R4 VRD B12EF153J Resistor 15k ohm 1 4W 1 AA R5 VRD B12HF150J Resistor 15 ohm 1 2W 1 AA R10 VRD B12EF153J Resistor 15k ohm 1 4W 1 AA R20 VRD B12EF471J Resistor 470 ohm 1 4W 1 AA R22 23 VRD B12HF390J Resistor 39 ohm 1 2W 2 AA R30 31 VRN B12EK202F Resistor 2k ohm 1 4W R 2275 2 AA R30 31 VR...

Page 39: ...witch lever A 1 AC 4 5 MLEVPA154WRF0 Switch lever B 1 AC 4 6 MLEVPA155WRF0 Switch lever C 1 AC 4 7 MSPRCA075WRE0 Switch spring A 1 AB 4 8 MSPRCA076WRE0 Switch spring B 3 AB 4 9 PHOK A081WRF0 Latch hook 1 AN 4 10 LANGQA251WRW0 Noise filter angle 1 AF 4 11 MHNG A216WRM0 Lower oven hinge 1 AG 4 12 MHNG A215WRM0 Upper oven hinge 1 AG 4 13 FCOVPA019WRY0 Stirrer cover assembly 1 AS 4 14 FFANMA013WRY0 St...

Page 40: ...NEOUS 6 1 TINSMA003WRR0 Operation manual 1 AL 6 2 TLABPA034WRR0 Earth label 1 AC 6 3 FW VZB254WRE0 Switch harness 1 AM 6 4 FW VZB246WRE0 Main harness 1 BB 6 5 LHLDW0017YBE0 Wire saddle M R 2285 1 AA 6 6 TCAUHA176WRR0 H caution label 1 AC 6 7 TSPCNB959WRR0 Name plate R 2275 1 AH 6 7 TSPCNB958WRR0 Name plate R 2285 1 AH 6 8 TLABS0057WRR0 Fuse label M6 3A R 2275 2 AA 6 8 TLABSA054WRR0 Fuse label F10A...

Page 41: ...ial screw 4 AA 7 28 XFTSD40P12000 Screw 4mm x 12mm 3 AA 7 29 XFPSD40P06K00 Screw 4mm x 6mm 3 AA 7 30 LX WZA035WRE0 Special washer 1 AA HOW TO 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 4 DESCRIPTION PACKING ADD KIT CPADBA164WRK0 WRAP COVER SSAKH0111WRE0 DOOR PROTECTION SHEET SPADP0336WRE0 PACKI...

Page 42: ... 40 MG1 MG2 7 8 7 4 4 32 7 18 1 4 OL 7 14 4 19 4 12 4 17 4 11 4 3 7 4 7 8 4 2 7 14 7 11 7 18 7 2 4 31 7 7 4 18 4 16 4 14 4 13 4 38 2 1 4 32 4 36 4 23 6 14 4 1 7 20 4 9 4 8 4 7 SW4 4 8 7 24 SW2 4 43 SW1 4 5 4 4 SW5 4 6 SW3 4 15 7 19 7 12 7 12 7 19 7 19 2 2 2 1 x 2 7 6 1 6 4 26 1 2 R1 7 29 RY S2 7 26 R2 7 29 F1 6 14 7 26 7 1 1 5 7 1 4 10 7 5 7 5 T1 T2 7 4 7 4 RY S1 4 22 4 42 4 49 4 50 2 7 7 11 7 11 ...

Page 43: ...EL PARTS 5 1 5 18 5 20 5 4 5 5 5 6 5 16 5 3 7 2 5 13 4 2 5 14 7 2 5 13 2 5 17 5 2 5 15 5 12 5 19 5 15 7 1 3 5 9 5 11 5 9 5 10 5 8 5 7 2 5 7 22 5 14 DOOR PARTS 3 2 3 3 2 2 3 2 1 3 2 3 7 3 1 3 4 3 20 3 10 3 4 3 9 3 6 3 21 3 6 3 3 3 16 3 22 3 5 3 18 3 19 3 8 3 14 3 11 3 12 3 15 3 17 3 13 ...

Page 44: ...42 R 2275 R 2285 93 SHARP CORP 12S1 30E Printed in Germany ...

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