Sharp R-290H Service Manual Download Page 27

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R-290H(S)

SCHEMATIC

NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. COOKING TIME PROGRAMMED.
3. START KEY TOUCHED.

SCHEMATIC

NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. CLOCK APPEARS ON DISPLAY.

NOTE: " " indicates components with potential above 250V.

Figure O-1 Oven Schematic-OFF Condition

Figure O-2 Oven Schematic-ON Condition

POWER TRANSFORMER

MAGNETRON

H.V. RECTIFIER

TURNTABLE MOTOR

FAN MOTOR

OVEN LAMP

MONITOR SWITCH

CONTROL
UNIT

1ST. LATCH
SWITCH

2ND. INTERLOCK
RELAY CONTROL
SWITCH

TTM

COM.

RY-1

N.O.

RY-2
2ND.
INTERLOCK
RELAY

H.V. FUSE

0.6A

CAPACITOR

0.91

AC2100V

TEMPERATURE

FUSE

120˚C (OVEN)

EARTH

230 - 240V

50Hz

BLU

BRN

LIVE

NEUTRAL

G-Y

FUSE

T6.3A

LINE CROSS CAPACITOR

0.068

/AC250V

NOISE SUPPRESSION COIL

LINE BYPASS

CAPACITOR

0.0022

/AC250V

LINE BYPASS

CAPACITOR

0.0022

/AC250V

NOISE FILTER

POWER TRANSFORMER

MAGNETRON

H.V. RECTIFIER

TURNTABLE MOTOR

FAN MOTOR

OVEN LAMP

MONITOR SWITCH

CONTROL
UNIT

1ST. LATCH
SWITCH

2ND. INTERLOCK
RELAY CONTROL
SWITCH

TTM

COM.

RY-1

N.O.

RY-2
2ND.
INTERLOCK
RELAY

H.V. FUSE

0.6A

EARTH

230 - 240V

50Hz

BLU

BRN

LIVE

NEUTRAL

G-Y

FUSE

T6.3A

LINE CROSS CAPACITOR

0.068

/AC250V

NOISE SUPPRESSION COIL

LINE BYPASS

CAPACITOR

0.0022

/AC250V

LINE BYPASS

CAPACITOR

0.0022

/AC250V

NOISE FILTER

CAPACITOR

0.91

AC2100V

TEMPERATURE

FUSE

120˚C (OVEN)

Summary of Contents for R-290H

Page 1: ...CAUTION MICROWAVE RADIATION 1 WARNING 1 PRODUCT SPECIFICATIONS 2 GENERAL INFORMATION 2 APPEARANCE VIEW 3 OPERATION SEQUENCE 4 FUNCTION OF IMPORTANT COMPONENTS 5 SERVICING 6 TEST PROCEDURE 8 TOUCH CONTROL PANEL 14 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE 18 MICROWAVE MEASUREMENT 24 WIRING DIAGRAM 25 PICTORIAL DIAGRAM 26 CONTROL PANEL CIRCUIT 27 PRINTED WIRING BOARD 28 PARTS LIST 29 SHARP CORP...

Page 2: ...R 290H S 36 ...

Page 3: ...out a microwave energy absorbing load attached Never look into an open waveguide or antenna while the device is energized WARNING Never operate the oven until the following points are ensured A The door is tightly closed B The door brackets and hinges are not defective C The door packing is not damaged D The door is not deformed or warped E There is not any other visible damage with the oven Servi...

Page 4: ...se Dimensions Width 460 mm Height 275 mm including foot Depth 355 mm Cooking Cavity Dimensions Width 322 mm Height 212 mm Depth 336 mm Turntable diameter 295 mm Control Complement Touch Control System Timer 0 99 minutes 99 seconds Microwave Power for Variable Cooking Repetition Rate 100P Full power throughout the cooking time 70P approx 70 of FULL Power 50P approx 50 of FULL Power 30P approx 30 of...

Page 5: ...r setting If not pressed HIGH is automatically selected Press to alter the cooking result for automatic opera tions 6 TIMER CLOCK PAD Press to set clock timer child lock or demonstration mode 7 STOP CLEAR PAD Press to clear during programming Press once to stop operation of oven during cooking press twice to cancel cooking programme 8 INSTANT COOK START PAD Press once to cook for 1 minute at 100 o...

Page 6: ...tch switch COM NO Closed Open 2nd interlock relay control switch COM NO Closed Open Monitor switch COM NC Open Closed The circuits to the power transformer fan motor and turntable motor are cut off when the 1st latch switch and 2nd interlock relay control switch are made open The oven lamp remains on even if the oven door is opened after the cooking cycle has been interrupted because the relay RY1...

Page 7: ...en button pushes up the switch lever and then the switch lever pushes up the latch head The latch heads are moved upward and released from latch hook Now the door will open Figure D 1 Door Open Mechanism 1ST LATCH SWITCH AND 2ND INTERLOCK RELAY CONTROL SWITCH 1 When the oven door is closed the contacts COM NO must be closed 2 When the oven door is opened the contacts COM NO must be opened MONITOR ...

Page 8: ...pleted carry out 3D checks and recon nect the leads to the primary of the power transformer 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 Check all functions Microwave ovens should not be run empty To test for the presence of microwave energy within a cavity place a cup of cold water on the o...

Page 9: ...outlet Display does not operate prop erly when STOP CLEAR pad is touched Oven lamp does not light at door opened Display ap pears Oven does not start when the START pad is touched Dis play appears Oven lamp does not light Dis play appears Fan motor does not operate Display appears Turntable motor does not oper ate Display appears Oven or any electrical parts does not stop when cooking time is 0 or...

Page 10: ...the start of the test 3 Temperature of the water The initial temperature of the water is 10 1 C 4 Select the initial and final water temperature so that the maximum difference between the final water temperature and the ambient temperature is 5 C 5 Select stirring devices and measuring instruments in order to minimize addition or removal of heat 6 The graduation of the thermometer must be scaled b...

Page 11: ...he equation is P 80 x T P 80 x 10 C 800 Watts JUDGEMENT The measured output power should be at least 15 of the rated output power CAUTION 1 C CORRESPONDS TO 80 WATTS REPEAT MEASUREMENT IF THE POWER IS INSUFFICIENT a Primary winding 2 5 ohms approximately b Secondary winding 176 ohms approximately c Filament winding less than 1 ohm C HIGH VOLTAGE RECTIFIER ASSEMBLY TEST HIGH VOLTAGE RECTIFIER TEST ...

Page 12: ...minal NO Normally open terminal NC Normally close terminal S C Short circuit O C Open circuit If incorrect readings are obtained make the necessary switch adjustment or replace the switch CARRY OUT 4R CHECKS F TEMPERATURE FUSE TEST CARRY OUT 3D CHECKS Disconnect the leads from the terminals of the temperature fuse Then using an ohmmeter make a continuity test across the two terminals as described ...

Page 13: ...PLACE HIGH VOLTAGE FUSE WITH THE CORRECT VALUE REPLACE MENT K 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...

Page 14: ...s faulty and must be replaced About the other pads the above method may be used 4 CARRY OUT 4R CHECKS CARRY OUT 3D CHECKS Remove the outer case and check voltage between Pin No 3 of the 2 pin connector A and normal open terminal of the relay RY2 on the control unit with an A C voltmeter The meter should indicate 230 240 volts if not check oven circuit RY1 and RY2 Relay Test These relays are operat...

Page 15: ...o primary side Low voltage transformer or secondary circuit defective of low voltage transformer Check and replace control unit 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 trans for...

Page 16: ...r is supplied 2 Indicator Circuit This circuit consists of 4 digits 12 segments and 3 TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL common electrodes using a Liquid Crystal Display 3 Power Source Circuit This circuit generates voltage necessary in the control unit from the AC line voltage In addition the synchro nizing signal is available in order to compose a basic standard time in ...

Page 17: ...t up its function 14 P43 IN To input signal which communicates the door open close information to LSI Door close H level signal 0V Door open L level 5V 15 BZ OUT Signal to sound buzzer 2 0 kHz A key touch sound B Completion sound 16 R00 OUT Key strobe signal Signal applied to touch key section A pulse signal is input to P23 K00 K01 and K02 terminal while one of G1 line keys on key matrix is touche...

Page 18: ... 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 35 SEG3 OUT Terminal not used 36 SEG4 OUT Oven lamp fan motor and turntable motor driving signal To turn on and off shut off relay RY1 The square waveform voltage is de...

Page 19: ...e models the power supply cord be tween the touch control panel and the oven proper is so long enough that they may be separated from each other SERVICING 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 ...

Page 20: ...g the right side of the outer case 4 Remove the remaining five 5 screws from the rear of the outer case 5 Slide the entire outer case back out about 1 inch 3 cm to free it from retaining clips on the cavity face plate 6 Lift entire outer case from the unit 7 Discharge the H V capacitor before curring out any 1 Disconnect the supply 2 Door opened and wedged open 3 Discharge high voltage capacitor T...

Page 21: ...holding the transformer to bottom plate from the upper side 6 Remove the remaining two 2 screws from the bottom 7 Remove the transformer 8 Now the power transformer is free POWER TRANSFORMER REMOVAL Re install 1 Rest transformer on the bottom plate with its primary terminals toward the oven face plate 2 Secure transformer with four 4 screws to the bottom plate 3 Re connect wire leads primary and h...

Page 22: ...graphic sheet to the control panel frame by rubbing with a soft cloth not to scratch 9 Tear the small backing paper from the ribbon cable of the membrane switch 10 Insert the two 2 holes of the ribbon cable into the two 2 pins of the control panel frame rear side 11 Attach the ribbon cable to the control panel frame rear side 12 Place the edge of the membrane switch s ribbon cable on the lower por...

Page 23: ...he fan motor by pulling and rotating the fan blade with your hand 10 Now the fan blade will be free CAUTION Do not re use the removed fan blade because the hole for shaft may be larger than normal 11 Remove the two 2 screws holding the fan motor to the fan duct 12 Now the fan motor is free INSTALLATION 1 Install the fan motor to the fan duct with the two 2 screws 2 Install the fan blade to the fan...

Page 24: ...ITCH AND MONITOR SWITCH REMOVAL 1 CARRY OUT 3D CHECKS 2 Disconnect wire leads from the switches 3 Remove two 2 screws holding latch hook to oven flange 4 Remove the switch lever from the oven cavity 5 Remove latch hook assembly from oven flange 6 Push outward on the two 2 retaining tabs holding switch in place 7 Switch is now free Re install 1 Re install each switch in its place The 1st latch swit...

Page 25: ...lock relay control switch and monitor switch are oper ating properly Refer to chapter Test Proce dures B An approved microwave survey meter should be used to assure compliance with proper micro wave 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 ho...

Page 26: ...crowave ovens must be used for test ing 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 low form of 600 ml beaker with inside diameter of approx 8 5cm and made of an electrically non conductive material su...

Page 27: ...APACITOR 0 91µF AC2100V TEMPERATURE FUSE120 C OVEN EARTH 230 240V 50Hz BLU BRN LIVE NEUTRAL G Y FUSE T6 3A N L LINE CROSS CAPACITOR 0 068µ AC250V NOISE SUPPRESSION COIL LINE BYPASS CAPACITOR 0 0022µ AC250V LINE BYPASS CAPACITOR 0 0022µ AC250V NOISE FILTER POWER TRANSFORMER MAGNETRON H V RECTIFIER TURNTABLE MOTOR FAN MOTOR OVEN LAMP MONITOR SWITCH CONTROL UNIT 1ST LATCH SWITCH 2ND INTERLOCK RELAY C...

Page 28: ...COM ORG GRY N RED WHT L GRY GRY N C N O GRY GRY Cabinet side Front side RED WHT 2ND INTERLOCK RELAY CONTROL SWITCH RED POWER TRANSFORMER HIGH VOLTAGE FUSE G Y B L U B R N EARTH LIVE N E U T R A L POWER SUPPLY CORD NOISE FILTER OVEN CAVITY BACK PLATE GRN GRY WHT WHT GRY GRY ORG RED GRY CN A CN B 2 ORG 1 3 ORG GRY GRN 2 1 COM ORG N O OVEN LAMP TEMPERATURE FUSE OVEN WHT GRN GRN CONTROL UNIT RY1 2ND I...

Page 29: ... R30 3 3k R20 15k R10 15k R50 20kF R6 15k C10 0 1µ 25v C4 0 01µ 25v C20 0 1µ 25v C5 0 1µ 25v C7 0 1µ 25v C6 0 1µ 25v 1 14 15 29 45 54 30 44 C3 0 01µ 25v C40 0 01µ 25v C11 0 01µ 25v C1 0 1µ 25v ZD1 HZ4B3 J1 D20 D21 D22 J10 J11 J12 J13 J14 J15 VRS1 10G471K R4 910 1 2w R41 15k R40 4 7k R75 220k R76 220k R77 220k R78 220k SP1 D40 IF NOT SPECIFIED 1 10W 5 IF NOT SPECIFIED 1SS270A Q10 DTA143EAK Q21 DTD1...

Page 30: ...A B C D E F G H 2 3 4 5 6 1 2 3 4 5 6 Figure S 3 Printed Wiring Board DIP CN B C21 T1 S D2 P J1 1 C8 2 5 E Q22 B 2 1 SP1 Q21 J12 J13 J14 J15 E C2 R4 3 4 ZD1 D3 D4 D1 VRS1 RY2 RY1 CN A 1 3 J11 J10 D20 D21 D40 D22 CHIP SIDE UNIT CODE ...

Page 31: ...RTS 3 1 FPNLCB696WRKZ Control panel frame with key unit 1 AZ 3 1 1 PSHEPA870WRZZ Graphic sheet 1 AX 3 1 2 QSW KA026DRZZ Membrane switch 1 AQ 3 1 3 GMADIA118WRRZ Display window 1 AL 3 1 4 HDECQA236WRPZ Control panel decoration 1 AT 3 2 FBTN A146WRKZ Open button assembly 1 AS 3 2 1 JBTN B187WRFZ Open button 1 AH 3 2 2 HDECQA239WRPZ Button decoration 1 AT 3 3 MSPRCA050WRE0 Open button spring 1 AB 3 4...

Page 32: ...EZ Main wire harness 1 AV 6 5 TINSEA964WRRZ Instruction book 1 AM 6 6 FW VZB888WREZ Switch harness 1 AU 6 7 TSPCND300WRRZ Rating label 1 AF SCREWS NUTS AND WASHERS 7 1 XHPSD40P08K00 screw 4 mm x 8 mm 5 AC 7 2 XHTSD40P08RV0 Screw 4mm x 8mm 5 AA 7 3 XOTSD40P08000 Screw 4mm x 8mm 10 AA 7 4 LX CZ0052WRE0 Special screw 2 AA 7 5 LX EZA042WRE0 Special screw 2 AB 7 6 XHPSD30P06000 Screw 3mm x 6mm 1 AA 7 7...

Page 33: ...BINET PARTS 7 3 2 1 7 3 7 3 7 8 7 8 1 9 6 3 4 11 4 3 7 3 7 5 2 2 4 7 4 10 6 6 4 2 6 1 6 2 7 3 7 2 7 3 7 9 7 9 1 7 1 12 7 1 4 5 7 3 4 13 7 6 7 3 7 2 7 3 4 12 7 1 1 4 1 6 1 10 1 11 4 14 1 10 1 14 1 3 4 1 7 2 2 2 4 6 1 8 1 13 4 9 1 5 4 8 4 4 7 1 7 1 1 1 1 2 7 7 7 4 4 9 2 3 7 1 7 2 A ...

Page 34: ...3 6 3 5 3 4 3 3 3 2 3 2 1 3 2 2 Before attaching Control unit to Control panel foil side of Control unit must be cleaned by ethyl alcohol 3 1 2 A 5 2 5 5 5 6 5 3 5 7 5 2 2 5 2 1 5 2 3 5 1 5 4 6 4 Actual wire harness may be different than illustration 6 6 CONTROL PANEL PARTS DOOR PARTS MISCELLANEOUS ...

Page 35: ...TION BOOK 6 2 TURNRTABLE SUPPORT INTO THE OVEN CAVITY Not replaceable items TRAY PAD ASSY CPADBA296WRKZ PACKING CASE MICROWAVE OVEN TOP PAD ASSEMBLY FPADBA511WRKZ WRAP COVER SSAKHA014WRE0 FPAK A446WRKZ BOTTOM PAD ASSEMBLY FPADBA512WRKZ DOOR PROTECT SHEET SPADPA580WRE0 ...

Page 36: ...P CORPORATION ALL RIGHTS RESERVED No part of this publication may be reproduced stored in retrieval systems or transmitted in any form or by any means electronic mechanical photocopying recording or otherwise without prior written permission of the publisher ...

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