Sharp R-202EW Service Manual Download Page 9

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R-202EW
R-203EW

Figure O-1. Oven Schematic-Off Condition

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED

2. CLOCK APPEARS ON DISPLAY

SCHEMATIC

NOTE: CONDITION OF OVEN

DOOR CLOSED

COOKING TIME PROGRAMMED

VARIABLE COOKING CONTROL "HIGH"

"START" PAD TOUCHED

Figure O-2. Oven Schematic-Cooking Condition

POWER
TRANSFORMER

RECTIFIER

MAGNETRON

CAPACITOR
0.82

AC2100V

C/T FUSE

120V AC
60 Hz

OVEN
LAMP

TURN-
TABLE
MOTOR

FAN
MOTOR

MONITOR
SWITCH

SECONDARY
INTERLOCK
SWITCH

TTM

GRN

COM.

DOOR
SENSING
SWITCH

(RY-1)

(RY-2)

CONTROL UNIT

PRIMARY
INTERLOCK
RELAY

N.O.

TEMPERATURE
FUSE (OVEN)

POWER
TRANSFORMER

RECTIFIER

MAGNETRON

CAPACITOR
0.82

AC2100V

C/T FUSE

120V AC
60 Hz

OVEN
LAMP

TURN-
TABLE
MOTOR

FAN
MOTOR

MONITOR
SWITCH

SECONDARY
INTERLOCK
SWITCH

TTM

GRN

N.O.

COM.

DOOR
SENSING
SWITCH

(RY-1)

(RY-2)

CONTROL UNIT

PRIMARY
INTERLOCK
RELAY

TEMPERATURE
FUSE (OVEN)

Summary of Contents for R-202EW

Page 1: ... Page PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY INSIDE FRONT COVER BEFORE SERVICING INSIDE FRONT COVER WARNING TO SERVICE PERSONNEL 1 MICROWAVE MEASUREMENT PROCEDURE 2 FOREWORD AND WARNING 3 PRODUCT SPECIFICATIONS 4 GENERAL INFORMATION 4 OPERATION 6 TROUBLESHOOTING GUIDE 9 TEST PROCEDURE 10 TOUCH CONTROL PANEL 18 COMPONENT REPLA...

Page 2: ...tion 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 Mic...

Page 3: ...pacitor 4 Disconnect the leads to the primary of the power transformer 5 Ensure that the leads remain isolated from other components and oven chassis by using insulation tape 6 After that procedure reconnect the power supply cord When the testing is completed 1 Disconnect the power supply cord and then remove outer case 2 Open the door and block it open 3 Discharge high voltage capacitor 4 Reconne...

Page 4: ...he 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 3 1 2 in and made of an electrically nonconductive material such as glass or plastic Theplacingofthisstandardloadintheovenisimportantnotonlytoprotecttheoven butalsotoinsurethatanyleakage is measured accurately 4 Set the cooking control on Full Power Cooking Mode 5 Cl...

Page 5: ...ng is not damaged D The door is not deformed or warped E There is not any other visible damage with the oven Servicing and repair work must be carried out only by trained service personnel DANGER Certaininitialpartsareintentionallynotgroundedandpresent a risk of electrical shock only during servicing Service personnel Do not contact the following parts while the appliance is energized HighVoltageC...

Page 6: ...ency 2450 MHz Case Dimensions Width 18 1 8 Height 10 7 8 Depth 13 1 4 Cooking Cavity Dimensions Width 12 5 8 0 7 Cubic feet Height 7 7 8 Depth 13 1 4 Control Complement Touch Control System Clock 1 00 12 59 Timer 0 99 minutes 99 seconds Microwave Power for Variable Cooking Repetition Rate P HI Full power throughout the cooking time P 90 approx 90 of FULL Power P 80 approx 80 of FULL Power P 70 app...

Page 7: ...Door open button Push to open door 2 Oven door with see through window 3 Safety door latches The oven will not operate unless the door is securely closed 4 Door hinges 5 Door seals and sealing surfaces 6 Turntable motor shaft 7 Removable turntable support Carefully place the turntable support in the center of the oven floor 8 Removable turntable Place the turntable securely on the turntable suppor...

Page 8: ...he 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 Themonitorswitchiselectricallymonitoringtheoperation of the secondary interlock switch and primary interlock relay RY2 andismechanicallyassociatedwiththedoor so that it will function in the following sequence 1 When the door o...

Page 9: ...N CAPACITOR 0 82µF AC2100V C T FUSE 120V AC 60 Hz OVEN LAMP TURN TABLE MOTOR FAN MOTOR MONITOR SWITCH SECONDARY INTERLOCK SWITCH TTM OL FM GRN A3 COM DOOR SENSING SWITCH B2 B1 RY 1 RY 2 CONTROL UNIT PRIMARY INTERLOCK RELAY A1 N O TEMPERATURE FUSE OVEN POWER TRANSFORMER RECTIFIER MAGNETRON CAPACITOR 0 82µF AC2100V C T FUSE 120V AC 60 Hz OVEN LAMP TURN TABLE MOTOR FAN MOTOR MONITOR SWITCH SECONDARY ...

Page 10: ...ORE REPLACING A BLOWN C T FUSE TEST THE DOOR SENSING SWITCH PRI MARY INTERLOCK RELAY RY2 SECOND ARY INTERLOCK SWITCH AND MONITOR SWITCH FOR PROPER OPERATION RE FER TO CHAPTER TEST PROCEDURE NOTE C T FUSE AND MONITOR SWITCH ARE REPLACED AS AN ASSEMBLY TURNTABLE MOTOR The turntable motor rotates the turntable located on the bottom of the oven cavity so that the food on the turntable is cooked evenly...

Page 11: ... an assembly IMPORTANT Whenever troubleshooting is performed with the power supply cord disconnected It may in some cases be necessary to connect the power supply cord after the outer case has been removed in this event 1 Disconnect the power supply cord and then remove outer case 2 Open the door and block it open 3 Discharge high voltage capacitor 4 Disconnect the leads to the primary of the powe...

Page 12: ...er cord is plugged into wall receptacle Any letters or indicators do not ap pear in display when power cord is first plugged into wall outlet Display does not operate properly when STOP CLEAR key is touched Buzzer should sound and time of day should appear in display C T fuse blows when the door is opened Fan motor does not operate All other electric components function Oven lamp does not light at...

Page 13: ...ming a water temperature rise test This test shouldonlybeusedifabovetestsdonotindicateafaultymagnetronandthereisnodefectinthefollowing componentsorwiring siliconrectifier highvoltagecapacitorandpowertransformer Thistestwillrequire 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 ...

Page 14: ...hrough the vent holes of the oven cavity especially the cooling fan and air guide 5 Reconnect all leads removed from components during testing 6 Reinstall the outer case cabinet 7 Reconnect the power supply cord after the outer case is installed 8 Run the oven and check all functions C HIGH VOLTAGE RECTIFIER TEST 1 Disconnect the power supply cord and then remove outer case 2 Open the door and blo...

Page 15: ...all functions 8 Run the oven and check all functions PRIMARY INTERLOCK SYSTEM TEST DOOR SENSING SWITCH 1 Disconnect the power supply cord and then remove outer case 2 Open the door and block it open 3 Discharge high voltage capacitor 4 Isolatetheswitchandconnecttheohmmetertothecommon COM andnormallyopen NO terminal of the switch The meter should indicate an open circuit with the door open and a cl...

Page 16: ...Reconnect the power supply cord after the outer case is installed 8 Run the oven and check all functions 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 Con...

Page 17: ...pacitor 4 Reconnect all leads removed from components during testing 5 Re install the outer case cabinet 6 Reconnect the power supply cord after the outer case is installed 7 Run the oven and check all functions TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST J KEY UNIT TEST 1 Disconnect the power supply cord and then remove outer case 2 Open the door and block it open 3 Discharge high voltage cap...

Page 18: ...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...

Page 19: ...ow the troubleshooting guide given below if indicator does not light up after above check and repairs are finished 1 Disconnect the power supply cord and then remove outer case 2 Open the door and block it open 3 Discharge high voltage capacitor 4 Disconnect the leads to the primary of the power transformer 5 Ensure that these leads remain isolated from other components and oven chassis by using i...

Page 20: ...supplied 2 Indicator Circuit This circuit consists of 4 digits 12 segments and 3 common electrodes using a Liquid Crystal Display TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL 3 Power Source Circuit This circuit generates voltage necessary in the control unitfromtheAClinevoltage Inaddition thesynchronizing signal is available in order to compose a basic standard time in the clock cir...

Page 21: ... voltage in accordance with the Model in operation is applied to set 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...

Page 22: ...ltage 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 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 rela...

Page 23: ...lf is so short that the 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 so long enough that they may be separated from each other For thosemodels therefore itispossibletocheckandrepair ...

Page 24: ... definite click can be heard when the microwave oven door is unlatched Hold the door in a closed position with one hand then push the door open button with the other this causes the latch leads to rise it is then possible to hear a click as the door switches operate 3 Visuallycheckthedoorandcavityfaceplatefordamage dents cracks signs of arcing etc Carry out any remedial work that is necessary befo...

Page 25: ... HIGH VOLTAGE RECTIFIER WHEN REPLACING IT RE PLACE HIGH VOLTAGE RECTIFIER ASSEM BLY HIGH VOLTAGE COMPONENTS REMOVAL HIGH VOLTAGE CAPACITOR AND HIGH VOLTAGE RECTIFIER ASSEMBLY POWER TRANSFORMER REMOVAL 1 Disconnect the power supply cord and remove outer case 2 Open the oven door and block it open 3 Discharge high voltage capacitor 4 Disconnect the wire leads main wire harness from power transformer...

Page 26: ...king Turntable motor REMOVAL 1 Disconnect the power supply cord and remove outer case 2 Open the door and block it open 3 Discharge high voltage capacitor 4 Remove the magnetron from the waveguide Refer to chapter MAGNETRON REMOVAL 5 Disconnect the wire lead from the C T fuse 6 Remove the one 1 screw to get the C T fuse off 7 Disconnect the wire leads from the fan motor 8 Disconnect the wire lead ...

Page 27: ...he power supply cord and then remove outer case 2 Open the door and block it open 3 Discharge high voltage capacitor If the door sensing switch secondary interlock switch and monitor switch do not operate properly due to a misadjustment the following adjustment should be made 4 Loosen the two 2 screws holding latch hook to the oven cavity front flange 5 Withdoorclosed adjustlatchhookbymovingitback...

Page 28: ...panel on two 2 hole of upper and lower oven hinges 6 Re install choke cover to door panel by pushing Note After any service to the door A Make sure that door sensing switch secondary interlock switch and monitor 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 ...

Page 29: ...D WHT TEMPERATURE FUSE OVEN POWER SUPPLY CORD 120V 60Hz GRD H N NOTE The grounding conductor of the power supply cord has been grounded by power supply cord fixing screw The screw must allways be kept tight NOTE The neutral WHT wire must be connected to the terminal with N mark on the power supply cord RED WHT DOOR SENSING SWITCH GRY RED POWER TRANSFORMER BLK WHT GRY CONTROL PANEL GRY ORG ORG WHT ...

Page 30: ...G3 SEG2 SEG1 COM3 COM2 COM1 SEG14 SEG13 R01 R02 R03 P20 P21 P22 P23 K00 K01 K02 K03 COM0 COM1 AVSS P40 P41 P42 P43 C2 470µ 25v C21 10µ 35v C8 220µ 10v R5 1k 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 3 3k 1 4w 6 2k 1 4w J1 D20 D21 D22 J10 J1...

Page 31: ...CABUA817WRPZ Outer case cabinet 1 BD 2 2 GLEGPA074WRE0 Foot 2 AC CONTROL PANEL PARTS 3 1 FPNLCB571WRKZ Control panel frame with key unit 1 BC 3 1 1 FUNTKB067WREZ Key unit 1 AY 3 2 JBTN B151WRFZ Open button 1 AF 3 3 MSPRCA050WRE0 Open button spring 1 AB 3 4 DPWBFC188WRUZ Control unit 1 BH 3 5 QCNC A014WRZZ Rubber connector 1 AE 3 6 RLCDSA097DRZZ Liquid crystal display 1 AM 3 7 XEPSD30P08XS0 Screw 3...

Page 32: ...ve parts requiring return should be returned as indicated in the Service Policy REF NO PART NO DESCRIPTION Q TY CODE 7 2 XHTSD40P08RV0 Screw 4mm x 8mm 4 AA 7 3 LX CZA070WRE0 Special screw 2 AC 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 XHPSD40P08000 Screw m4x8 zinc pla 3 AA 7 8 XHTSD40P12RV0 Screw 4mm x 12mm 1 AA 7 9 XOTSE40...

Page 33: ...A B C D E F G H OVEN AND CABINET PARTS 7 10 2 1 7 10 7 10 7 3 7 3 1 8 6 4 6 3 7 8 1 3 4 3 7 6 7 5 2 2 4 7 4 10 4 2 7 10 7 10 6 1 6 2 7 10 7 2 7 10 7 9 7 9 1 6 1 11 7 1 4 5 1 2 7 10 7 2 7 1 1 5 1 1 1 2 1 1 1 9 1 4 4 1 7 2 2 2 4 6 1 7 1 10 4 9 4 8 4 4 7 7 7 4 4 9 ...

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

Page 35: ...UCTION BOOK 6 2 TURNRTABLE SUPPORT INTO THE OVEN CAVITY Not replaceable items TRAY PAD ASSY CPADBA287WRKZ PACKING CASE MICROWAVE OVEN TOP PAD ASSEMBLY FPADBA454WRKZ POLYETHYLENG BAG SSAKHA014WRE0 SPAKCD593WREZ R 202EW FPAK A409WRKZ R 203EW BOTTOM PAD ASSEMBLY FPADBA455WRKZ ...

Page 36: ...01 BY SHARP CORPORATION ALL RIGHTS RESERVED No part of this publication may be repro duced stored in retrieval systems or trans mitted in any form or by any means elec tronic mechanical photocopying record ing or otherwise without prior written per mission of the publisher ...

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