Sharp R-405KS-T Service Manual Download Page 33

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R405KST

12 – 2

[2] Control Panel Circuit (Figure S-2)

Figure S-2. Control Panel Circuit

LCD

(RLCDSA155DR

ZZ)

R68

15K

R69

15K

R70

15K

R72

15K

㨪

R78:270Kx5

C60

㨪

C63:330pF/50Vx4

CPU

NIT

OVEN

LAMP,

TURNTABLE

MOTOR,

FAN

MOTOR

MICRO

DOOR

SENSING

SWITCH

R71

NOTE:

SPECIFIED

/10W

G13

G12

G11

G10

Q30

DTA143EKA

C20

0.1uF

50V

R41

15K

B-1

B-2

Q10

2SA1037AK

Q11

DTA143EKA

4.7K

1/4W

267Y

DTD143ES

u/35V

1/4W

510

1/2W

1SS270A

DTA123J

P45

P41

P71

P70

-5

INT

DOOR

PA15

1DR

~D4

1N400

2x4

AN4

AN5

DTA143EKA

RY2

DU12D1-1P(M)-R

AC(

AC(H)

0.1uF

POW

R110

15K

AN7

R13

10K

R14

10K

R15

10K

IC1

AN7

AN6

AN5

AN4

AN3

AN2

AN1

AN0

P57

P56

P55

P53

P52

P51

P50

P47

P46

P45

P44

P43

SEG

P10

P11

P12

P13

P14

P15

P16

P17

(F)

CF1

(G)

JUMPER

WIE

DU12D1-1P(M)-R

DEFROST

NIGHT

GHT

SOF

REHEA

MELT

COOK

STAR

CLOCK

STOP

CLEAR

POWER

LEV

MINUTE

POPCORN

KEY

Q21

DTA143EKA

WH-1

510

1/2W

510

1/2W

㽳

㽲

1SS270A

LD2

LD4

ST-C190KGKT

CN-G

5597-13CPB7F

TLS4

M00G

56P

18-A

Summary of Contents for R-405KS-T

Page 1: ... SERVICE MANUAL R405KST MODEL CONTENTS SHARP CORPORATION This document has been published to be used for after sales service only The contents are subject to change without notice In the interest of user safety the oven should be restored to its origi nal condition and only parts identical to those specified should be used WARNING TO SERVICE PERSONNEL Microwave ovens con tain circuitry capable of ...

Page 2: ...LOWN MONITOR FUSE TEST 8 4 10 Procedure I NOISE FILTER TEST 8 4 11 Procedure J TOUCH CONTROL PANEL ASSEMBLY TEST 8 4 12 Procedure K KEY UNIT TEST 8 5 13 Procedure L RELAY TEST 8 5 14 Procedure M DEFROST TEST 8 6 15 Procedure N FOIL PATTERN ON THE PRINTED WIRING BOARD TEST 8 6 CHAPTER 9 TOUCH CONTROL PANEL ASSEM BLY 1 OUTLINE OF TOUCH CONTROL PANEL 9 1 2 DESCRIPTION OF LSI 9 1 3 SERVICING FOR TOUCH...

Page 3: ... 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 ...

Page 4: ...gh voltage capacitor 4 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 2 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 ca...

Page 5: ...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 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 ...

Page 6: ...ckets and hinges are not defective C The door packing is not damaged D The door is not deformed or warped E There is no other visible damage with the oven Servicing and repair work must be carried out only by trained service personnel 3 DANGER Certain initial parts are intentionally not grounded and present a risk of electrical shock only during servicing Service personnel Do not contact the follo...

Page 7: ...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 approx 70 of FULL Power P 60 approx 60 of FULL Power P 50 approx 50 of FULL Power P 40 approx 30 of FULL Power P 30 approx 40 of FULL Power P 20 approx 2...

Page 8: ...eptacle 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 the extension cord must be used it should be a 3 wire 15 amp or higher rated cord Do not drape over a countertop or table where it can be ...

Page 9: ...disabled after three minutes when the oven is not in use These fea tures are automatically enabled when the door is opened and closed or the STOP CLEAR pad is pressed STOP CLEAR TIMER CLOCK COOK DEFROST REHEAT MELT SOFTEN WARM MINUTE PLUS POWER LEVEL START NIGHT LIGHT POPCORN 1 2 3 4 5 6 7 8 0 9 ...

Page 10: ...he high voltage components are de energized the oven lamp remains on 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 pri mary interlock switch and secondary interlock relay and is mechan ically associated with the door so that it will function in the following sequence a When the d...

Page 11: ... MAGNETRON HIGH VOLTAGE CAPACITOR 0 94uF AC2200V SECONDARY INTERLOCK RELAY GND RY1 OVEN LAMP RELAY COM N O COM N C HIGH VOLTAGE RECTIFIER H N C3 C2 C1 C1 LINE CROSS CAPACITOR 0 22uF AC250V C2 C3 LINE BYPASS CAPACITOR 0 033uF AC250V BLK NOISE FILTER MONITOR FUSE 20A TO LOAD TO LOAD TO SOURCE TO SOURCE OVEN THERMAL CUT OUT 120VAC 60Hz WHT GRN B2 B1 CONTROL UNIT MAGNETRON TEMPERATURE FUSE RY2 DOOR SE...

Page 12: ...NSING SWITCH SECONDARY INTER LOCK RELAY RY2 RE LAY RY1 PRIMARY INTER LOCK SWITCH AND MONITOR SWITCH FOR PROPER OPERATION REFER TO CHAPTER TEST PROCE DURE NOTE MONITOR FUSE AND MONITOR SWITCH ARE REPLACED AS AN ASSEMBLY 4 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 ...

Page 13: ...e is installed 7 Run the oven and check all functions 1 TROUBLESHOOTING CHART Never touch any part in the circuit with your hand or an uninsulated tool while the power supply is connected RE CK A B C D E F F G H RE RE CK J CK CK CK K L N I POSSIBLE CASE AND DEFECTIVE PARTS SHORT IN POWER CORD SHORT OR OPENED WIRING MAGNETRON POWER TRANSFORMER H V RECTIFIER ASSEMBLY HIGH VOLTAGE CAPACITOR MAGNETRON...

Page 14: ... temperature making sure to stir the thermometer 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 8 to 64 6 F 19 3 to 35 9 C rise in tempera ture If the water temperatures are accurately measured and tested for the required time period the test results will indicate if the...

Page 15: ...ng of the magnetron Check for restricted air flow to the magnetron especially the cool ing fan and air guide An open thermal cut out Oven indicates overheating of the oven exchange the 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 fa...

Page 16: ...f 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 8 Procedure G MONITOR SWITCH TEST 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 Before performing this test ...

Page 17: ...onents 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 11 Procedure J 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 ...

Page 18: ...voltage capacitor 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 12 Procedure K KEY UNIT TEST If the display fails to clear when the STOP CLEAR pad is depressed first verify the flat ribbon cable is making good contact verify that the door sen...

Page 19: ... oven and check all functions 14 Procedure M DEFROST TEST WARNING The oven should be fully assembled before following procedure 1 Open the door 2 Place one cup of water in the center of the turntable tray in the oven cavity 3 Close the door touch the DEFROST pad once 4 Press 2 then press 5 5 Touch the START pad 6 The oven is in Defrost cooking condition 7 The oven will operate as follows 8 If impr...

Page 20: ...primary of the power transformer 5 Ensure that these leads remain isolated from other components and oven chassis by using insulation tape 6 After that procedure re connect the power supply cord 7 Follow the troubleshooting guide given below for repair 8 Disconnect the power supply cord and then remove outer case 9 Open the door and block it open 10 Discharge high voltage capacitor 11 Reconnect al...

Page 21: ...ble sounds key touch sound and completion sound 6 Synchronizing Signal Circuit The power source synchronizing signal is available in order to com pose 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...

Page 22: ...o control oscillation input of XIN 32 VSS IN Power source voltage 5 0V The power source voltage to the drive LSI is input to VSS terminal 33 P27 OUT Key strobe signal Signal applied to touch key section A pulse signal is input to P70 P71 P41 and P45 terminal while one of G8 line keys on key matrix is touched 34 P26 OUT Key strobe signal Signal applied to touch key section A pulse signal is input t...

Page 23: ...G 16 73 VCC IN Power source voltage GND 0V 74 VREF IN A D converter power source voltage GND 0V The power source voltage to drive the A D converter Connected to GND 75 AVSS IN A D converter power source voltage 5 0V The power source voltage to drive the A D converter 76 COM3 OUT Common data signal Connected to LCD signal COM3 77 COM2 OUT Common data signal Connected to LCD signal COM0 78 COM1 OUT ...

Page 24: ...e oven itself 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 those models therefore it is possible to...

Page 25: ...is adjusted accordingly 3 Soldering As the melting point of lead free solder Sn Ag Cu is higher and has poorer wettability flow to prevent damage to the land of the PWB extreme care should be taken not to leave the bit in contact with the PWB for an extended period of time Remove the bit as soon as a good flow is achieved The high content of tin in lead free solder will cause premature corrosion o...

Page 26: ...t close firmly 2 Door hinge support or latch hook is damaged 3 The door gasket or seal is damaged 4 The door is bent or warped 5 There are defective parts in the door interlock system 6 There are defective parts in the microwave generating and transmission assembly 7 There is visible damage to the oven Do not operate the oven 1 Without the RF gasket Magnetron 2 If the wave guide or oven cavity are...

Page 27: ...all outer case and check that oven is operating properly 4 HIGH VOLTAGE RECTIFIER AND HIGH VOLTAGE CAPACITOR REMOVAL To remove the components proceed as follows 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 high voltage wire of the power transformer from the high voltage capacitor 5 Disconnect the...

Page 28: ...ct the power supply cord and then remove outer case 2 Open the door and block it open 3 Discharge high voltage capacitor 4 Remove the control panel assembly referring to chapter of CON TROL PANEL ASSEMBLY REMOVAL 5 Disconnect the ribbon cable of the membrane switch from the con trol unit 6 Remove the back light PWB from the control panel frame 7 Remove the four 4 screws holding the control unit to...

Page 29: ...ure that no metal pieces enter the gap 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 pli ers 8 Remove the fan blade assembly from the shaft of the fan motor by pulling and rota...

Page 30: ...wn 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 primary 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 cl...

Page 31: ...ng to the latch head Reinstall the latch spring to the door frame Reinstall latch head to door frame 6 Reinstall 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 as shown Figure C 5 8 Re install the door stopper to the door assembly NOTE After any service to the door 1 Make sure that door sensing switch and primary interlock switch ...

Page 32: ... BRN ORG THERMAL CUT OUT OVEN MAGNETRON TEMP FUSE FAN MOTOR RED RED WHT WHT RED RED POWER SUPPLY CORD 120V 60Hz NOTE The neutral WHT wire must be connected to the terminal with N mark on the power supply cord RED WHT WHT H N NOTE The grounding conductor of the power supply cord has been grounded by power supply cord fixing screw The screw must always be kept tight COM N O DOOR SENSING SWITCH GRY G...

Page 33: ...DR D1 D4 1N4002x4 AN4 AN5 AN6 Q4 DTA143EKA D30 SP1 RY1 RY2 DU12D1 1P M R AC N AC H 0 1uF 50 d a b c V POWER UNIT R110 15K AN7 R13 10K R14 10K R15 10K IC1 AN7 AN6 AN5 AN4 AN3 AN2 AN1 VL1 VL2 AN0 P57 P56 P55 CNTR0 P53 P52 P51 P50 P47 P46 P45 P44 P43 INT0 SEG10 SEG11 SEG12 SEG13 SEG14 SEG15 SEG16 SEG9 SEG8 P3 P4 P5 P6 P7 P8 P9 P10 P11 P12 P13 P14 P15 P16 P17 BL F F COM NL CF1 1 24 25 40 41 64 65 80 G...

Page 34: ...R405KST 12 3 3 Printed Wiring Board Figure S 3 Figure S 3 Printed Wiring Board ...

Page 35: ...ormation 1 MODEL NUMBER 2 REF NO 3 PART NO 4 DESCRIPTION Parts marked may cause undue microwave exposure Parts marked are used in voltage more than 250V 1 OVEN PARTS 2 DOOR AND CONTROL PANEL PARTS INDEX DOOR PROTECTION SHEET SPADPA204WRE0 TOP PAD ASSEMBLY FPADBA624WRKZ PLASTIC BAG SSAKHA032WRE0 Not replaceable items PACKING CASE FPAK A563WRKZ BOTTOM PAD ASSEMBLY FPADBA625WRKZ 6 2 TURNTABLE TRAY 6 ...

Page 36: ...4 13 4 11 6 4 1 10 4 3 4 5 4 7 6 2 6 1 2 2 7 1 1 12 4 10 7 3 7 3 4 1 1 13 7 9 7 5 7 6 7 8 7 8 4 4 7 10 1 5 4 8 7 7 1 4 1 4 4 6 7 8 4 2 1 9 1 8 2 3 2 3 2 3 2 3 7 10 7 4 4 9 7 10 7 1 4 12 1 7 7 10 7 10 7 2 7 2 1 2 1 11 7 10 4 14 7 1 1 2 1 3 1 1 ...

Page 37: ... 12 RMOTDA186WRE0 AW Turntable motor Interchangeable 1 13 RTRN A746WRZZ BM Power transformer 1 13 RTRN A745WRZZ Power transformer Interchangeable OVEN PARTS 2 1 GCABUB010WRPZ BH Outer case cabinet 2 2 GDAI A390WRWZ BA Base plate 2 3 GLEGPA104WREZ AF Leg OVEN PARTS 4 1 PHOK A130WRFZ AK Latch hook 4 2 LBNDKA163WRPZ AK H V capacitor band 4 3 NFANJA053WRFZ AG Fan blade 4 4 LANGTA419WRPZ AT Chassis sup...

Page 38: ... 2 DOOR AND CONTROL PANEL PARTS Actual wire harness may be different from illustration 6 6 6 5 5 6 5 7 5 3 3 3 6 7 3 2 5 3 1 5 3 2 5 4 5 1 5 2 5 5 5 8 3 1 3 1 4 3 1 5 3 1 6 3 1 2 3 1 3 3 1 1 3 1 1 1 3 1 1 2 3 3 ...

Page 39: ... PSHEPB178WREZ AT Key sheet 3 1 6 QSW KA065DRZZ AQ FPC 3 2 DPWBFC531WRKZ BK Control unit 3 3 XEPS730P08XS0 AB Screw 3mm x 8mm DOOR PARTS 5 1 FDORFA412WRTZ BF Door panel 5 2 PSHEPA336WRP0 AF Sealer film 5 3 FWAKPA445WRKZ BF Door frame assembly 5 3 1 GWAKPB033WRFZ AX Door frame 5 3 2 HDECQA303WRPZ BA Door decoration 5 4 HPNL A866WRRZ AR Door screen 5 5 GCOVHA382WRF0 AM Choke cover 5 6 LSTPPA139WRF0 ...

Page 40: ...4 6 AG MSPRCA157WREZ 2 3 1 3 AF MSPRTA084WRE0 2 5 7 AB N NFANJA053WRFZ 1 4 3 AG NTNT A108WREZ 1 6 2 AW P PCOVPA311WRE0 1 4 7 AG PCUSGA532WRP0 1 4 8 AF PCUSUA191WRP0 1 4 9 AC PCUSUA410WRP0 1 4 11 AB PCUSUA455WRP0 1 4 12 AD PDUC A610WRF0 1 4 13 AR PDUC A936WRFZ 1 4 14 AV PHOK A130WRFZ 1 4 1 AK PPACGA084WRF0 1 4 10 AE PPACGA272WREZ 1 4 15 AG PSHEPA336WRP0 2 5 2 AF PSHEPB178WREZ 2 3 1 5 AT Q QFS TA013...

Page 41: ...out prior written permission of the publisher COPYRIGHT XXXX BYSHARP CORPORATION ALL RIGHTS RESERVED COPYRIGHT 2006 BY SHARP CORPORATION ALL RIGHTS RESERVED No part of this publication may be reproduced stored in retrieval systems or transmitted in anyform or by any means electronic mechanical photocopying re cording or other wise without prior written permission of the publisher ...

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