Sharp R-2277 Service Manual Download Page 34

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R-2277
R-2287

POWER

h
g

f
e
d
c
b
a

i
j
k

P30

P27
P26
P25
P24
P23
P22
P21
P20
P17
P16
P15
P14
P13
P12
P11
P10
PO7
PO6
PO5
PO4
PO3
PO2
PO1
PO0
P37
P36
P35
P34
P33
P32
P31

VCC

VSS
XOUT
XIN
P70
P71

RESET

INT0
INT1
P42
P43
P44
P45
P46
P47
P50
P51
P52
P53
P54
P55
P60
AN1
AN2
AN3
AN4
AN5
AN6
AN7
VREF
AVSS
VEE

CF1

CST4.00MGW

2200p

C80

16V

2200p

C81

16V

IC1

IZA648DR

R80

R81

220K

15K

R85

15K

R84

R82

4.7K

R83

4.7K

ENCODER

COM.

SW3

SW1

SW4

SW2

SW.UNIT

SW5

SW.UNIT

R63 47K

R37 47K

R36 47K

D32

D33

R51 5.1K

(J4)

(J3)

(J2)

(J1)

C60

0.01µ 25V

MAGNETRON THERMISTOR

DOOR SW.

EXHAUST

THERMISTOR

Q70

KRA101M

R70

3.3K

SP1

D50

R50

100

C50

D20

11ES1

R40

1.1K

R41

20K

R42

3.3K

: IF NOT SPECIFIED, 1SS270A

: IF NOT SPECIFIED, 1/4W 5%

: IF NOT SPECIFIED, 0.01µ 16V

TAB4

TAB3

TAB2

TAB1

OVEN LAMP

BLOWER

MOTOR

STIRRER

MOTOR

AC230V

50HZ

MICRO 1

MICRO 2

D31

R33

D30

R32

R31

2KF

R35

300K

C31

22µ25V

R30

2KF

R34

300K

C30

22µ25V

–

D23

CT2

CT1

RY3

VS-18MB-NR

RY2

VS-18MB-NR

RY1

OJ-SH-118LM

D22

D21

VRS1

10G471K

(J9)

Q21

DTD143ES

Q22

DTB143ES

Q23

DTB143ES

–

C21

4.7µ 35V

0.1µ

C10

50V

R20

470

Q20

DTA114YS

Q10

KRA101M

C20

0.1µ 50V

+–

C11

T1 PA080DR

D1–D4 : 11ES1

0.1µ 50V

1000µ 35V

–

ZD1

HZ12C1

R1 1.8K

2SB953

–

3.3µ 50V

0.01µ 25V

–

560 1/2W

47µ 16V

ZD2

HZ4C3

R3 1K

2SA1561

R10

15K

–

11ES1

100µ 16V

22µ 25V

R5 15 1/2W

C12

0.1µ

50V

CONTROL UNIT

R65

1.5K

C90

R90 4.7 K

R91 6.8 K

INTAKE

THERMISTOR

Figure S-2. Control Panel Circuit (R-2277)

Summary of Contents for R-2277

Page 1: ...NG 7 TEST PROCEDURE 10 CONTROL PANEL ASSEMBLY 18 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE 23 MICROWAVE MEASUREMENT 28 TEST DATA AT A GLANCE 29 WIRING DIAGRAM 30 PICTORIAL DIAGRAM 31 CONTROL PANEL CIRCUIT 32 PRINTED WIRING BOARD 34 PARTS LIST 35 S5504R2277H In interests of user safety the oven should be restored to its original condition and only parts identical to those specified should be u...

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: ...nite on yli 250 V Bemerk Deler som er merket asterisk er utsatt for spenninger over 250V til jord Bemærk Delemærketmedstjernebenyttesmedhøjere spænding end 250 volt CAUTION MICROWAVE RADIATION DO NOT BECOME EXPOSED TO RADIATION FROM THE MICROWAVE GENERATOR OR OTHER PARTS CONDUCTING MICROWAVE ENERGY SERVICE MANUAL COMMERCIAL MICROWAVE OVEN R 2277 R 2287 GENERAL IMPORTANT INFORMATION This Manual has...

Page 4: ...quency of 2450MHz Outside Dimensions Width 510mm Height 335 mm Depth 470 mm Cooking Cavity Dimensions Width 330 mm Height 180 mm Depth 330 mm Control Complement Electronic timer 0 30 min Microwave Power level 100 50 20 10 MICROWAVE POWER SETTING button START button Set Weight Approx 33kg R 2287 Approx 31kg R 2277 GENERAL INFORMATION WARNING THIS APPLIANCE MUST BE EARTHED IMPORTANT THE WIRES IN THI...

Page 5: ...er supply cord 18 Mounting plate 19 Screw for mounting plate DISPLAY AND INDICATORS Check indicators after the oven starts to confirm the oven is operating as de sired 1 Cook indicator This indicator shows cooking in progress 2 Digital display 3 Microwave power level indicator OPERATING KEYS 4 Power 100 5 Power 50 6 Power 20 7 Power 10 8 ELECTRIC TIMER Rotate the knob to enter cooking time 9 START...

Page 6: ...latch switch COM NO Closed Open Monitor switch COM NC Open Closed 2nd latch switch COM NO Closed Open Stop switch COM NO Closed Open 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 stirrer motors and oven lamp remains on even if the oven doo...

Page 7: ... might flow back in the power circuit WEAK POINT R 2287 FUSE R 2277 F1 Ifthewireharnessorelectricalcomponentsmakeashort circuit this weak point Fuse F1 blows to prevent an electric shock or fire hazard DOOR OPEN MECHANISM 1 The door release lever is pulled 2 The upper latch head is lifted up by the linked door release lever 3 The latch lever is lifted up by the door release lever 4 The joint lever...

Page 8: ... through the exhausting air vents at the oven cavity STIRRER MOTOR SM The stirrer motor drives a stirrer antenna to stir the microwave radiation from the waveguide FUSE F6 3A 250V F2 1 If the wire harness or electrical components are short circuited this fuse blows to prevent an electric shock or fire hazard 2 The fuse also blows when 1st latch switch SW1 remains closed with the oven door open and...

Page 9: ...ted carry out 3D checks and reconnect the leads to the primary of the high voltage transformer When all service work is completed and the oven is fully assembled the microwave power output should be checked and microwave leakage test carried out REMEMBER TO CHECK 4R 1 Reconnect all leads removed from components during testing 2 Replace the outer case cabinet 3 Reconnect the supply 4 Run the oven C...

Page 10: ...es not work Oven does not stop after end of cooking cycle Oven lamp blower motor and stirrer motor stop Home fuse blows when starting the oven Oven goes into cook cycle but shuts down before end of cooking cycle 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 cooking but oven lamp blower motor and stirrer motor d...

Page 11: ...ILTER POWER SUPPLY CORD FUSE HOLDER SHORTED WIRE HARNESS OPENED WIRE HARNESS 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 EXHAUST THERMISTOR IS HIGH TEMPERATURE OF INTAKE THERMISTOR IS HIGH TEMPERATURE OF MAGNETR...

Page 12: ...c P 120x T R 2277 Measuring condition 1 Container The water container must be a cylindrical borosilicate glass vessel having a maximum material thickness of 3 mm and an outside diameter of approximately 190 mm 2 Temperature of the oven and vessel The oven and the empty vessel are at ambient temperature prior to the start the test 3 Temperature of the water The initial temperature of the water is 1...

Page 13: ...rements of the high voltage circuits including the magnetron filament CARRY OUT 3D CHECKS Disconnect the leads to the primary winding of the high voltage transformer Disconnect the filament and secondary winding connections from the rest of the HV circuitry Using an ohmmeter set on a low range it is possible to check the continuity of all three windings The following readings should be obtained a ...

Page 14: ...WN IN BOTH DIRECTIONS CARRY OUT 3D CHECK SIsolate the switch to be tested and using an ohmmeter check between the terminals as described in the following table Table Terminal Connection of Switch COM Common terminal Plunger Operation COM to NO COM to NC NO Normally open terminal Released O C S C NC Normally close terminal Depressed S C O C S C Short circuit O C Open circuit If incorrect readings a...

Page 15: ...on of ohmmeter Parts Name condition closed circuit condition open circuit When room temperature C C is approx 20 C Thermal cut out 145 C This is not resetable type Above 145 C Closed circuit Thermal cut out 115 C This is not resetable type Above 115 C Closed circuit If incorrect readings are obtained replace the thermal cut out An open circuit oven thermal cut out 115 C indicates that the oven cav...

Page 16: ...Ω 20 C Approx 13 04 kΩ 25 C Approx 10 74 kΩ If the meter does not indicate above resistance replace the thermistor CARRY OUT 4R CHECKS EXHAUST THERMISTOR TEST CARRY OUT 3D CHECKS Disconnect connector B from the CPU unit Measure the resistance of the thermistor with an ohmmeter Connect the ohmmeter leads to the leads of the thermistor Room Temp Resistance 15 C Approx 77 45 kΩ 20 C Approx 61 47 kΩ 2...

Page 17: ...Unit troubleshooting by unit replacement is described according to the symptoms indicated 1 Switch Unit The following symptoms indicate a defective switch unit Replace the switch unit a When touching the select buttons a certain button produces no signal at all b When touching the select buttons sometimes a button produces no signal 2 Control Unit The following symptoms may indicate a defective co...

Page 18: ...ower cord POWER terminal of CPU connector CN A 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 J9 and solder CARRY OUT 3D CHECKS BEFORE REPAIR 4 Pattern at a and b are broken Insert the coil RCILF2003YAZZ between c and d CARRY OUT 3D CHECKS BEFORE RE...

Page 19: ...NOTE At the time of these repairs make a visual inspection of the varistor for burning damage and examine the transformer with tester for the presence of layer short circuit check primary coil resistance If any abnormal condition is detected replace the defective parts CARRY OUT 4R CHECKS ...

Page 20: ...st Air Temperature Detecting Circuit This is a circuit for transmitting output change of CONTROL PANEL ASSEMBLY OUTLINE OF CONTROL PANEL thermistor Exhaust Air 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 current flowingthroughtheprimarywindingofthehighvoltage transformer During heatin...

Page 21: ... signal which communicates the door open close information to LSI Door closed H level signal 0V Door opened L level signal 5 0V 13 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 16 P54 P52 OUT Terminal not used 17 P51 IN Signal coming from switch unit When either...

Page 22: ...e 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 or 10 H and L level is repeated according to power level P0WER LEVEL ON OFF 50 26sec 22sec 20...

Page 23: ...21 R 2277 R 2287 Pin No Signal I O Description Signal similar to P21 57 64 P37 P30 OUT Terminal not used ...

Page 24: ...e to the power input terminal of the touch control panel then it is possible to check and repair the controls of the touch control panel it is also possible to check the sensor related controls of the touch control panel by using the dummy resistor s 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 gr...

Page 25: ...remedial work that is necessary before operating the oven Do not operate the oven if any of the following conditions exist 1 Door does not close firmly 2 Door hinge support or latch hook is damaged 3 The door gasket or seal or damaged 4 The door is bent or warped 5 There are defective parts in the door interlock system 6 Therearedefective partsinthemicrowavegenerating and transmission assembly 7 T...

Page 26: ...CARRY OUT 3D CHECKS 2 Disconnect the wire leads from the blower motor and the blower motor thermal cut out 3 Remove the one 1 screw holding the blower motor to the oven cavity 4 Remove the one 1 screw holding the blower motor to the chassis support 5 Remove the blower motor Now the blower motor is free STIRRER MOTOR UPPER REMOVAL 1 Remove the outer case cabinet referring to OUTER CASE REMOVAL and ...

Page 27: ...ush down the right side two 2 hooks fixing the control unit to the panel frame assembly and lift up the control unit upward 11 Now the control unit and control panel frame with switch unit are free CAUTION At installing control panel unit assembly to main body set 1 Ensuretheinstallationofwiring relatedpartswith out negligence 2 When inserting key cable to main body set ensure themfreefromcaught i...

Page 28: ...ch or Monitor switch removal 5 1 Disconnect the wire leads from the switch 5 2 Push the retaining tabs outward slightly and then pull the switch forwards and remove it from the 1ST 2ND 3RD LATCH SWITCH STOP SWITCH AND MONITOR SWITCH ADJUSTMENT In case 1st latch switch 2nd latch stop switch 3rd latch switch and monitor switch do not operate properly due to a mis adjustment the following adjustment ...

Page 29: ...NGE DOOR ASSEMBLY LATCH HEADS OUTER CASE CABINET Figure C 5 Door Assembly Replacement and Adjustment CHOKE COVER REMOVAL 1 Insert an iron plate thickness of about 0 5mm or flat type screw driver to the gap between the choke cover and door panel as shown figure to free the engaging part The protect sheet may be used not to damage the door panel DOOR REPLACEMENT AND ADJUSTMENT 2 Lift up the choke co...

Page 30: ...ply with the requirement for instrumentations as prescribed by the performance standard for microwave ovens must be used for testing MICROWAVE MEASUREMENT Recommended instruments are 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 lo...

Page 31: ...1 C2 1 07µF AC 2100V High voltage capacitor R 2287 C1 C2 0 94µF AC 2100V High voltage transformer R 2287 T1 T2 Filament winding 1Ω Secondary winding Approx 57Ω Primary winding Approx 1Ω High voltage transformer R 2277 T1 T2 Filament winding 1Ω Secondary winding Approx 83Ω Primary winding Approx 2Ω Magnetron MG1 Filament winding 1Ω Filament winding chassis Ω Magnetron MG2 Filament winding 1Ω Filame...

Page 32: ... RY1 RY3 RY4 TC1 MAGNETRON THERMAL CUT OUT 145C UPPER B2 B3 D1 H1 H3 INTAKE THERMISTER MAGNETRON THERMISTER ASYMMETRIC RECTIFIER H V RECTIFIER C2 H V CAPACITOR MG2 MAGNETRON LOWER T2 HIGH VOLTAGE TRANSFORMER FRONT F1 WEAK POINT A017 NOISE FILTER SW1 1ST LATCH SWITCH PRIMARY INTERLOCK SWITCH SW4 MONITOR SWITCH R1 MONITOR RESISTOR TC3 BLOWER MOTOR THERMAL CUT OUT 115C A7 A5 TC4 OVEN THERMAL CUT OUT ...

Page 33: ...NETRON THERMAL CUT OUT Lower F2 FUSE F6 3A G Y POWER SUPPLY CORD WHT F1 WEAK POINT A017 R 2278 ORG TC3 BLOWER MOTOR TAERMAL CUT OUT PNK GRY SW4 MONITOR SWITCH BM BLOWER MOTOR ORG ORG BRN 1 GRN 3 GRY 2 RED CN B 1 BLK 3 BLK 2 CN D GRN GRN BLU INTAKE THERMISTOR WHT SW2 2ND LATCH SWITCH Oven side BLK WHT WHT SM STIRRER MOTOR YLW PNK RED BLK GRY PNK ORG PNK T2 HIGH VOLTAGE TRANSFORMER C1 HIGH VOLTAGE C...

Page 34: ... J1 VA C60 0 01µ 25V MAGNETRON THERMISTOR DOOR SW EXHAUST THERMISTOR H3 H1 B1 B2 B3 Q70 KRA101M R70 3 3K SP1 D50 R50 100 C50 D20 11ES1 R40 1 1K R41 20K 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 BLOWER MOTOR STIRRER MOTOR AC230V 50HZ MICRO 1 MICRO 2 D31 R33 1K D30 R32 1K R31 2KF R35 300K C31 22µ25V R30 2KF R34 300K...

Page 35: ... 47K R36 47K D32 D33 R51 5 1K J4 J3 J2 J1 VA C60 0 01µ 25V MAGNETRON THERMISTOR DOOR SW EXHAUST THERMISTOR H3 H1 B1 B2 B3 Q70 KRA101M R70 3 3K SP1 D50 R50 100 C50 D20 11ES1 R40 1 1K R41 20K 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 BLOWER MOTOR STIRRER MOTOR AC230V 50HZ MICRO 1 MICRO 2 D31 R33 1K D30 R32 1K R31 1 ...

Page 36: ...34 R 2277 R 2287 6 4 5 1 2 3 6 4 5 1 2 3 A B C D E F G H A B C D E F G H Figure S 3 Printed Wiring Board 4 5 1 2 3 ...

Page 37: ...ly cord 1 BG 1 7 DH HZA009WRK0 Exhaust thermistor 1 AP 1 8 FW QZA104WRK0 High voltage rectifier assembly 1 BA CABINET PARTS 2 1 FDAI A183WRW0 Base plate assembly 1 BC 2 2 PSHEGA006WRE0 Rubber sheet A 2 AF 2 3 PSHEGA007WRE0 Rubber sheet B 2 AE 2 4 GCOVAA250WRW0 Rear cabinet 1 AX 2 5 FFTASA064WRY0 Oven lamp access cover assembly 1 AN 2 5 1 PCUSU0407WRP0 Cushion 1 AA 2 5 2 PREFHA051WRP0 Lamp reflecto...

Page 38: ...F304J Resistor 300k ohm 1 4W 2 AA R36 37 VRD B12EF473J Resistor 47k ohm 1 4W 2 AA R40 VRD B12EF112J Resistor 1 1k ohm 1 4W 1 AA R41 VRD B12EF203J Resistor 20k ohm 1 4W 1 AA R42 VRD B12EF332J Resistor 3 3k ohm 1 4W 1 AA R50 VRD B12EF101J Resistor 100 ohm 1 4W 1 AA R51 VRD B12EF512J Resistor 5 1k ohm 1 4W 1 AA R63 VRD B12EF473J Resistor 47k ohm 1 4W 1 AA R65 VRD B12EF152J Resistor 1 5k ohm 1 4W 1 AA...

Page 39: ...4 18 LANGQA370WRP0 Oven lamp mounting plate 1 AD 4 19 LBNDKA075WRP0 Capacitor holder 1 AD 4 20 PGIDHA054WRW0 Water proof cover 1 AF 4 21 NSFTPA031WRF0 Antenna motor shaft 2 AH 4 22 PCOVPA310WRF0 Splash cover 1 AZ 4 23 PCUSGA405WRP0 Cushion 1 AF 4 24 PCUSGA409WRP0 Cushion 1 AE 4 25 PCUSUA413WRP0 Cushion 2 AG 4 26 PCUSUA415WRP0 Cushion 2 AC 4 27 PCUSUA416WRP0 Cushion 2 AC 4 28 PDUC A607WRW0 Mg exhau...

Page 40: ...5 TLABSA065WRR0 BS13 label R 2277 1 AC 6 16 LHLDWQ005YBE0 Purse lock 1 AA SCRE NUTS AND WASHERS 7 1 XCBWW30P08000 Screw 3mm x 8mm 4 AB 7 2 XBPSD50P12KS0 Screw 5mm x 12mm 4 AA 7 3 XFTSD40P08TV0 Screw 4mm x 8mm 3 AA 7 4 XOTSD40P06000 Screw 4mm x 6mm 3 AA 7 5 XBPBW40P08M00 Screw 4mm x 8mm 1 AA 7 6 LX BZA048WRE0 Special screw 1 AA 7 7 LX WZA035WRE0 Special washer 1 AB 7 8 XWWSD40 10000 Washer 4mm x 1m...

Page 41: ... 7 36 XJPSD40P10000 Screw 4mm x 10mm 2 AA 7 37 XOTSC40P12000 Screw 4mm x 12mm 2 AA 7 38 XHPSD50P08000 Screw 5mm x 8mm 1 AB 7 39 XEPSD30P12XS0 Screw 3mm x 12mm 3 AB 7 40 PSPA A101WRE0 Washer 4 AB 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 ...

Page 42: ...9 SW4 4 9 4 5 4 6 SW2 4 11 SW1 SW3 SW5 4 7 4 10 F1 6 7 4 4 7 37 4 43 7 29 4 45 7 14 7 18 7 23 7 11 7 18 7 18 6 10 6 12 6 11 6 13 7 8 7 7 7 18 4 27 7 19 7 28 7 24 4 27 4 29 7 25 4 26 7 18 7 1 7 18 7 22 7 20 7 38 4 25 7 15 7 38 4 28 7 25 4 42 7 24 7 16 7 16 7 34 7 3 7 21 6 15 7 35 7 21 7 2 7 30 6 9 7 4 7 6 7 3 7 17 7 27 6 9 4 31 4 34 7 2 7 30 7 15 7 26 7 26 7 1 7 10 7 16 4 17 4 1 4 32 7 36 6 14 7 4 ...

Page 43: ...D E F G H CONTROL PANEL PARTS 5 15 5 16 5 17 5 18 5 4 5 11 5 12 5 10 5 14 5 1 5 9 5 8 5 7 5 6 5 13 5 13 5 2 5 3 5 5 5 19 5 20 5 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: ...P CORP 5S1 30E Printed in Germany PACKING ADD KIT CPADBA203WRK0 WRAP COVER DOOR PROTECTION SHEET SPADP0336WRE0 PACKING CASE SPAKCC551WRE0 DOOR PAD SPADF0341WRE0 TRAY HOLDER SPADPA505WRE0 PRINTING MATER INSTRUCTION BOOK Not replaceable items SPAKCC553WRE0 R 2287 SPAKCC554WRE0 R 2277 ...

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