Sharp R-305HK Service Manual Download Page 30

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R - 305HK
R-305HW

Figure S-1. Pictorial Diagram

HIGH VOLTAGE

CAPACITOR

H.V. RECTIFIER

POWER SUPPLY

CORD 120V 60Hz

HIGH VOLTAGE COMPONENTS

MAGNETRON

COM.

MONITOR

SWITCH

COM.

N.O.

N.C.

DOOR

SENSING

SWITCH

SECONDARY

INTERLOCK

SWITCH

TURNTABLE

MOTOR

POWER

TRANSFORMER

COM.

NOTE:

The neutral (WHT) wire must be

connected to the terminal with "N"

mark on the power supply cord.

GRY

WHT

GRY

RED

GRY

R E D

P N K

B L K

R E D

GRN

GRY

GRN

BLK

GRY

WHT

GRY

RED

BLK

PNK

GRY

C/T FUSE

FAN MOTOR

TEMPERATURE

FUSE (OVEN)

BLK

WHT

RED

RY1

PRIMARY

INTERLOCK

RELAY

CN-B

N.O.

COM.

RY2

N.O.

COM.

CONTROL UNIT

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.

GRY

OVEN LAMP

PNK

RED

PNK

Summary of Contents for R-305HK

Page 1: ...SERVED 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 17 COMPONENT REPLACEMENT AND ADJUSTMENT PROC...

Page 2: ...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 Microwav...

Page 3: ...capacitor 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 Recon...

Page 4: ...ty 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 Mode 5 Close ...

Page 5: ... 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 DANGER Certain initial parts are intentionally not grounded and present a risk of electrical shock only during servicing Service personnel Do not contact the following parts while the appliance is energized High Voltag...

Page 6: ...EAR pad START pad Oven Cavity Light Yes Safety Standard UL Listed FCC Authorized DHHS Rules CFR Title 21 Chapter 1 Subchapter J SPECIFICATION GENERAL INFORMATION GROUNDING INSTRUCTIONS This oven is equipped with a three prong grounding plug It must be plugged into a wall receptacle that is properly installed and grounded in accordance with the National Electrical Code and local codes and ordinance...

Page 7: ... 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 on the turntable support securely The turntable will rotate clockwise or counterclockwise Only remove for cleaning 9 Ventilation openings Rear 10 Oven light It will light when oven is operating door is open 11 Wa...

Page 8: ...gized 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 secondary interlock switch and primary interlock relay and is mechanically associated with the door so that it will function in the following sequence 1 When the door opens from the closed position the p...

Page 9: ...MP RELAY TURN TABLE MOTOR FAN MOTOR POWER TRANSFORMER MONITOR SWITCH RECTIFIER MAGNETRON SECONDARY INTERLOCK SWITCH TTM OL FM C T FUSE TEMPERATURE FUSE 150 C OVEN N O N O COM COM DOOR SENSING SWITCH RY1 RY2 CONTROL UNIT PRIMARY INTERLOCK RELAY GRN B2 CAPACITOR 0 94µF AC 2200V B1 120V AC 60 Hz OVEN LAMP OVEN LAMP RELAY TURN TABLE MOTOR FAN MOTOR POWER TRANSFORMER MONITOR SWITCH RECTIFIER MAGNETRON ...

Page 10: ...FORE 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 evenl...

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: ... into DEFROST but food is not defrosted well OFF CONDITION PROBLEM CONDITION SHORT IN POWER CORD SHORT OR OPENED WIRING MAGNETRON POWER TRANSFORMER H V RECTIFIER ASSEMBLY HIGH VOLTAGE CAPACITOR TEMPERATURE FUSE OVEN PRIMARY INTERLOCK SYSTEM SECONDARY INTERLOCK SWITCH MONITOR SWITCH C T FUSE OVEN LAMP COOLING FAN MOTOR TURNTABLE MOTOR TOUCH CONTROL PANEL WRONG OPERATION LOW VOLTAGE DIRTY OVEN CAVIT...

Page 13: ... the following procedure must be followed carefully 1 Fill the measuring cup with 16 oz 453cc of tap water and measure the temperature of the water with a thermometer or thermocouple temperature tester Stir the thermometer or thermocouple through the water until the temperature stabilizes Record the temperature of the water 2 Place the cup of water in the oven Operate oven at POWER P HI HIGH selec...

Page 14: ...y 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 defective and should be replaced 5 Reconnect all leads removed from components during testing 6 Reinstall the outer case cabinet 7 Reconnect the power sup...

Page 15: ...e power supply cord and then remove outer case 2 Open the door and block it open 3 Discharge high voltage capacitor 4 Disconnect two 2 wire leads from the male tab terminals of the Primary Interlock Relay Check the state of the relay contacts using a ohmmeter The relay contacts should be open If the relay contacts are closed replace the circuit board entirely or the relay itself 5 Reconnect all le...

Page 16: ...functions The following symptoms indicate a defective key unit a When touching the pads a certain pad produces no signal at all b When touching a number pad two figures or more are displayed c When touching the pads sometimes a pad produces no signal 2 Control Unit The following symptoms indicate a defective control unit 2 1 In connection with pads a When touching the pads a certain group of pads ...

Page 17: ...OK POPCORN TIMER CLOCK 9 3 6 5 2 8 0 G 3 G 4 G 5 G 6 G 7 G 8 G 9 G10 G11 G12 1 4 7 START STOP CLEAR Pin NO G12 Pin NO G1 Key unit ribbon cable Key unit Membrane Switch front view K RELAY 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 Disconnect the leads to the primary of the power transformer 5 Ensure that ...

Page 18: ...er case 2 Open the door and block it open 3 Discharge high voltage capacitor 4 Follow the troubleshooting guide given below for repair STEPS OCCURRENCE CAUSE OR CORRECTION 1 Only pattern at a is broken Insert jumper wire J1 and solder 2 Pattern at a and b are broken Insert the coil RCILF2003YAZZ between c and d 5 Make a visual inspection of the varistor Check for burned damage and examine the tran...

Page 19: ...n a key pad is touched a signal is completed through the key unit and passed back to the LSI through P50 P51 P52 and P53 to perform the function that was requested Control Unit Control unit consists of LSI reset circuit indicator circuit power source circuit relay circuit buzzer circuit synchro nizing signal circuit and back light circuit 1 Reset Circuit This circuit generates a signal which reset...

Page 20: ...requency input setting The internal clock frequency is set by inserting the resistor capacitor oscillation circuit with respect to X2 terminal 11 X2 OUT Internal clock oscillation frequency control output Output to control oscillation input of X1 12 RESET IN Auto clear terminal Signal is input to reset the LSI to the initial state when power is applied 13 15 P00 P02 OUT Terminal not used 16 P03 OU...

Page 21: ...to P50 P51 P52 and P53 terminal while one of G1 line keys on key matrix is touched 55 P32 OUT Key strobe signal Signal applied to touch key section A pulse signal is input to P50 P51 P52 and P53 terminal while one of G2 line keys on key matrix is touched 56 P31 OUT Key strobe signal Signal applied to touch key section A pulse signal is input to P50 P51 P52 and P53 terminal while one of G3 line key...

Page 22: ... possible to check the sensor related controls of the touch control panel by using the dummy resistor s 3 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 grounding terminal 2 Oscilloscope Single beam frequency range DC 10MHz type or more advanced model 3 Others Hand tools 4 Other Precautions 1 Before t...

Page 23: ...ed and that the iron temperature 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...

Page 24: ...rise it is then possible to hear a click as the door switches operate 3 Visually check the door and cavity face plate for damage dents cracks signs of arcing etc Carry out any 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 ...

Page 25: ...gnetron 6 Disconnect the filament lead short one of the power transformer from the high voltage capacitor 7 Remove the one 1 screw holding capacitor holder to bottom plate 8 Remove one 1 screw holding high voltage rectifier assembly to capacitor holder 9 Disconnect rectifier terminal from capacitor High voltage rectifier assembly is now free 10 Remove capacitor holder Capacitor is now free CAUTION...

Page 26: ...he control unit assembly to the control panel frame 7 Release the ontrol unit assembly from the six 6 tabs of the control panel frame 8 Now the ontrol unit assembly is free Installation 1 Remove remaining adhesive on the control panel frame surfaces with a soft cloth soaked in alcohol 2 Make sure that the LED sheet and liquid crystal display are installed in position 3 Reinstall the control unit a...

Page 27: ...AN MOTOR REMOVAL CAUTION Do not reuse the removed fan blade because the hole for shaft may be larger than normal 10 Now the fan motor is free INSTALLATION 1 Install the fan blade to the fan motor shaft according to the following procedure 2 Hold the center of the bracket which supports the shaft of the fan motor on the flat table 3 Apply the screw lock tight into the hole for shaft of the fan blad...

Page 28: ...tches If each switch has not activated with the door closed loosen screw and adjust the latch hook position After adjustment check the following 1 In and out play of door remains less than 0 5mm when in the latched position First check upper position of latch DOOR SENSING SWITCH SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH ADJUSTMENT Latch Heads Door Switch Lever Latch Hook Door Sensing Switch Mo...

Page 29: ...othly catch latch hook through latch holes and that latch head goes through center of latch hole 2 Deviation of door alignment from horizontal line of cavity face plate is to be less than 1 0mm 3 Door is positioned with its face pressed toward cavity face plate 4 Check for microwave leakage around door with an approved microwave survey meter Refer to Microwave Measurement Procedure Note The door o...

Page 30: ...E The neutral WHT wire must be connected to the terminal with N mark on the power supply cord GRY W H T WHT GRY RED GRY GRY R E D P N K B L K R E D GRN GRY GRY GRN BLK GRY WHT GRY RED RED BLK PNK GRY C T FUSE FAN MOTOR TEMPERATURE FUSE OVEN BLK WHT 2 1 WHT WHT WHT WHT RED RY1 PRIMARY INTERLOCK RELAY CN B CN B T1 1 2 N O COM RY2 N O COM CONTROL UNIT H N NOTE The grounding conductor of the power sup...

Page 31: ...T1 D1 D2 D3 D4 D1 D4 1N4002 X 4 SEG1 SEG3 SEG2 SEG4 SEG5 SEG6 SEG7 SEG8 SEG9 SEG10 SEG11 SEG12 COM3 COM2 COM1 B1 DOOR RST 5V INT BZ COM M C40 GND R1 560 1 2W CN B AC H AC N AC120V 60HZ G6 G7 G8 G3 J1 DTA123JS G10 G11 G12 G4 G5 G9 VR R30 3 3K 0 01uF 25V COM1 COM2 COM3 SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 P71 P72 AVDD P01 P00 RE SET X2 X1 VSS VDD XT2 XT1 IC P53 P52 P51 P50 P02 BL 17 G2 G1 SEG13 SEG14 R60 R...

Page 32: ...30 R 305HK R 305HW Figure S 3 Printed Wiring Board of Power Unit 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 ...

Page 33: ...1 BF 2 1 GCABUA889WRPZ Outer case cabinet R 305HK 1 BF 2 2 FDAI A265WRYZ Bottom plate 1 AW 2 3 GLEGPA074WRE0 Foot 4 AC CONTROL PANEL PARTS 3 1 CPWBFA858WRKZ Control unit assembly 1 BQ 3 2 HPNLCB804WRFZ Control panel frame R 305HW 1 AS 3 2 HPNLCB805WRFZ Control panel frame R 305HK 1 AS 3 3 PSHEPA912WRZZ Graphic sheet R 305HW 1 AW 3 3 PSHEPA920WRZZ Graphic sheet R 305HK 1 AW 3 4 XOTSD40P08000 Screw ...

Page 34: ...ction book 1 AP SCREWS NUTS AND WASHERS 7 1 XHPSD40P08K00 Screw 4mm x 8mm 2 AA 7 2 LX CZA070WRE0 Special screw 2 AC 7 3 LX CZA073WRE0 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 4mm x 8mm 5 AA 7 8 XHTSD40P08RV0 Screw 4mm x 8mm 4 AA 7 9 XHTSD40P12RV0 Screw 4mm x 12mm 1 AA 7 10 XOTSD40P080...

Page 35: ...TS A A 7 10 7 1 4 1 4 5 4 4 4 13 6 5 7 3 4 3 4 9 2 1 1 7 7 3 1 10 1 9 4 10 7 10 7 10 7 8 4 11 7 5 4 17 7 4 7 10 1 5 1 4 4 2 1 1 1 1 1 11 7 7 7 10 7 10 7 7 6 4 7 11 7 12 7 2 7 2 7 10 7 10 7 10 7 6 1 2 7 8 4 8 1 8 7 10 7 8 1 2 2 3 2 2 4 12 4 14 7 9 1 3 4 16 4 15 1 6 7 1 6 1 6 2 4 7 4 6 2 3 2 3 2 3 ...

Page 36: ...1 700E Printed in U S A DOOR PARTS CONTROL PANEL PARTS MISCELLANEOUS 3 2 3 1 3 6 3 5 3 4 3 3 Actual wire harness may be different from illustration 6 3 5 1 5 3 5 2 3 4 5 4 5 5 5 7 5 6 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 ...

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