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Sharp KB-6524PS, Service Manual

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Sharp KB-6524PS Service Manual Download Page 23

23

KB-6525PS
KB-6525PK
KB-6525PW

6.   To remove the Control Panel Frame Assembly,  

 

 

  remove the (1) screw holding the C/P cover, then unplug                                                                                              

      Control panel harness. Remove the (3) screws holding                                                                                             
       the Control Panel frame to faceplate (Fig 3).

 7.   After the Control panel frame is removed, you now have  
       access to the CPU board. 

Fig. 3

NOISE FILTER BOARD REPLACEMENT

.   Un-hook the black and white AC terminals from the Noise Filter PWB, plus the Red and double White terminals     
      (Fig 4).

2.   Remove the (1) screw holding the Noise Filter (Fig 4). 

Fig. 4

3.   Reverse order to reinstall.

C/P Cover

Noise

Filter

Unit

Red Wire

Double White Wire

White AC Wire

Black AC Wire

Screw

Summary of Contents for KB-6524PS

Page 1: ...lt in a severe possibly fatal electrical shock High Voltage Capacitor High Voltage Power Transformer High Voltage Rectifier Heat sink Magnetron and High Voltage Harness etc S19M304KB6524 KB 6525PS PK PW MICROWAVE DRAWER MODELS SERVICE MANUAL TABLE OF CONTENTS Page PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY INSIDE FRONT COVER BEFO...

Page 2: ...ration 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 M...

Page 3: ...n remove neccessary covers 2 Open the drawer and keep it open 3 Discharge high voltage 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 ...

Page 4: ...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 3 Set the cooking control on Full Power Cooking Mode 4 Close the drawer an...

Page 5: ...nges 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 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 ...

Page 6: ...h Control System Clock 1 00 12 59 Timer 0 99 min 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 40 of Full Power P 30 approx 30 of Full Power P 20 approx 20 of Full Power P 10 approx...

Page 7: ... electrician and have it replaced with a properly grounded three pronged wall receptacle or have a grounding adapter prop erly grounded and polarized If an extension cord must be used it should be a 3 wire 15 amp or higher rated cord Do not drape over a counter top or table where it can be pulled on by children or tripped over accidentally NOTE The directed features are disabled after one minute w...

Page 8: ...owing results The circuits to the stir fan motor the cooling fan motor and the high voltage componentsarede energized theovenlampremainson 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 secondary interlock relay and is mechanically associated with th...

Page 9: ...able power Cooking Sequence 1 Touch one of the SENSOR pads NOTE The oven should not be operated on sensor immediately after plugging in the unit Wait two minutes before cooking on SENSOR 2 The coil of shut off relay RY 1 is energized but the power transformer is not turned on 3 After about 16 seconds the cook relay RY 2 is energized The power transformer is turned on microwaveenergyisproducedandfi...

Page 10: ...R 0 0033μF 250V FUSE 20A FAN MOTOR OVEN LAMP MONITOR SWITCH PRIMARY INTERLOCK RELAY RECTIFIER MAGNETRON POWER TRANSFORMAR CAPACITOR 1 00μF AC 2300V STIRRER MOTOR Ｌ Ｎ Ａ７ Ａ５ Ａ１ Ａ３ C １ C ５ ＣＮ２０１ 1 ＣＮ１０１ ３ ＣＮ１０１ １ ＣＮ２０１ 5 CONTROL UNIT Ｎ １ Ｎ ２ Ｎ ３ Ｎ ４ Ｎ ５ Ｎ ６ Ｎ ７ Ｎ ８ SWITCHING REGULATOR OVEN THERMAL CUT OUT MG THERMAL CUT OUT SECONDARY INTELOCK SWITCH ＤＭ MICROWAVE DRAWER DOOR OPEN CLOSE MOTOR Ｒ Ｙ ４ DOO...

Page 11: ...en remove covers 2 Open the drawer and block it open 3 Discharge high voltage capacitor 4 Replace the Keyboard unit 5 Reconnect all leads removed from components during testing 6 Re install the covers 7 Reconnect the power supply cord after the covers are installed 8 Run the oven and check all functions 2 Control Unit The following symptoms indicate a defective control unit Before replacing the co...

Page 12: ...rrer motor RY4 Approx 26V D C Fan motor RY5 Approx 26V D C Switching regurator for drawer motor 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 all leads removed from components during testing 2 Open the drawer and block it open 3 Discharge high voltage capacitor 4 If the display fails to clear when th...

Page 13: ...it 7 Examine the touch control transformer with a tester for the presence of layer short circuit check the primary coil resistance which is approximately 151 6Ω 10 If any abnormal condition is detected replace the touch control transformer 8 Reconnect all leads removed from components during testing 9 Re install the outer case cabinet 10 Reconnect the power supply cord after the outer case is inst...

Page 14: ... in the oven cavity 3 Close the drawer 4 Touch the TIMER CLOCK pad once the POWER LEVEL pad twice and the START pad once And touch the number pad 1 once and the number pad 4 once Now the oven is in the sensor cooking condition and AH20 and ON will appear in the display 5 The oven will operate for the first 16 seconds without generating microwave energy NOTE ERROR will appear if the door is opened ...

Page 15: ...e power supply cord 9 Check the sensor cook operation proceed as follows 9 1 Close the door Touch the TIMER CLOCK pad once the POWER LEVEL pad twice and the START pad once And touch the number pads 1 once and the number pad 4 once 9 2 The control panel is in the sensor cooking operation 9 3 Afterapproximately25seconds pushplungerofselectswitchformorethan3seconds Thiscondition is same as judgement ...

Page 16: ...e digital read out countdown 3 Remove the cup from the oven and again measure the 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 28 ο to 54 ο F 16 ο to 30 ο C rise in temperature If the water temperatures are accurately measur...

Page 17: ...ohmmeter as follows When the drawer is open the meter should indicate a closed circuit When the monitor switch actuator is pushed by a screw driver through the lower latch hole on the front plate of the oven cavity with the drawer opened in this condition the plunger of the monitor switch is pushed in the meter should indicate an open circuit If improper operation is indicated the switch may be de...

Page 18: ...PT TO MEASURE THE FILAMENT AND HIGH VOLTAGE 2 Open the drawer and block it open 3 To discharge high voltage capacitor wait for 60 seconds 4 If the monitor fuse is blown when the drawer is opened check the primary interlock switch secondary interlock switch and monitor switch according to the TEST PROCEDURE for those switches before replacing the blown monitor fuse CAUTION BEFOREREPLACINGABLOWNMONI...

Page 19: ...h a way as to change the resistance values in parallel with R45 R49 Changing HUMIDITY SENSOR CIRCUIT the resistance values results in that there is the same potential at both F 3 terminal of the absolute humidity sensor and AN6 terminal of the LSI The voltage of AN7 terminal will indicate about 2 5V This initial balancing is set up about 16 seconds after the unit is put in the Sensor Cookingmode A...

Page 20: ... tin lead alloy solder it is recommend that a dedicated bit is used 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 wett ability 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...

Page 21: ...Hot parts Oven lamp Magnetron High voltage transformer and Oven cavity WARNING FOR WIRING 1 Disconnect the power supply cord 2 Make sure that a definite click can be heard when the microwave oven drawer is unlatched Hold the drawer in a closed position with one hand then pull the drawer open this causes the latch leads to rise it is then possible to hear a click as the drawer switches operate 3 Vi...

Page 22: ...e mounting angle with AC Cord attached and unplug AC Cord from molex Fig 2 4 Remove the 18 screws holding the Outer Case Side Angles then remove outer Case Fig 2 5 Remove the 10 screws holding the Back Plate NOTE You now have access to all components of the Drawer WARNING Follow all safety precautions as stated at the beginning of this Service Manual before proceeding Fig 2 MICROWAVE DRAWER DISASS...

Page 23: ...te Fig 3 7 After the Control panel frame is removed you now have access to the CPU board Fig 3 NOISE FILTER BOARD REPLACEMENT 1 Un hook the black and white AC terminals from the Noise Filter PWB plus the Red and double White terminals Fig 4 2 Remove the 1 screw holding the Noise Filter Fig 4 Fig 4 3 Reverse order to reinstall C P Cover Noise Filter Unit Red Wire Double White Wire White AC Wire Bla...

Page 24: ... properly due to a misadjustment the following adjustment should be made 6 Loosen the screw holding latch hook to the oven cavity flange 7 With drawer closed adjust latch hook by moving it back and forth and up and down 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 t...

Page 25: ...sembly do the following A Make sure that drawer 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 toassurecompliancewithpropermicrowaveradiation emission limitation standards After any servicing make sure of the following 1 Drawer latch heads smoothly catch latch hook through latc...

Page 26: ...discharge the high voltage capacitor wait for 60 seconds 4 To remove latch follow DRAWER SLIDE RAIL REMOVAL then remove the 10 screws holding door panel to door frame Fig L 1 5 With the door panel removed unhook latch s spring then remove screw Fig L 2 6 Proceed in reverse to reinstall 7 Adjust switch Fig L 1 Fig L 2 DOOR LATCH REMOVAL ...

Page 27: ... the cavity angle correctly before tightening screws 2 AfterAutodrawerGearisreinstalled inserttheholecoverinreverseordersothatitcanbesecuredwithaXOTS740P12000 common screw 1 Follow the Microwave Drawer disassembly as previously stated 2 Open the drawer and keep it open 3 To discharge the high voltage capacitor wait for 60 seconds 4 Remove the Microwave Drawer by following steps under DRAWER SUPPOR...

Page 28: ... RED 1 2 3 4 CN201 BLK R E D WHT ORG RED WHT BLK WHT NOISE FILTER BOARD N H WHT CONTROL UNIT CNM CNL CNK SWITCHING POWER SUPPLY CN101 CN201 T1 1 2 3 4 5 BLK RED CNC RY1 N O RY1 COM RY2 N O RY2 COM 7 6 5 4 3 2 1 BLK WHT BRN CNA BLK ORG BLK RED BLK ORG RED 1 2 3 CN101 BLK GRY GRN 1 2 3 4 5 BLU WHT RED CNN ORG 1 2 3 4 5 6 7 WHT WHT CNK 8 WHT WHT WHT WHT WHT WHT 1 2 3 4 5 6 7 WHT WHT WHT CNH 9 8 10 WH...

Page 29: ...BD 3 2 FPNLCB628MRK0 C P FRAME ASSY 30 KB 6525PS 1 BD 3 2 FPNLCB629MRK0 C P FRAME ASSY 30 KB 6525PK 1 BD 3 2 FPNLCB630MRK0 C P FRAME ASSY 30 KB 6525PW 1 BD 3 3 FUNTKB513MRE0 KEY UNIT KB 6524PS PK 1 AQ 3 3 FUNTKB514MRE0 KEY UNIT KB 6524PW 1 AQ 3 3 FUNTKB515MRE0 KEY UNIT KB 6525PS PK 1 AQ 3 3 FUNTKB516MRE0 KEY UNIT KB 6525PW 1 AQ 3 4 PCUSGB104MRP0 C P CUSHION Required 1 AB 3 5 XEPS730P10XS0 M3 X 10 ...

Page 30: ...AD R 7 AB 5 1 10 XHTS740P25000 SCREW 2 AB 5 1 11 JHNDMB001MRE0 DOOR HANDLE KB 6524PS 1 BL 5 1 11 JHNDMB002MRT0 DOOR HANDLE KB 6524PK 1 BL 5 1 11 JHNDMB003MRT0 DOOR HANDLE KB 6524PW 1 BL 5 1 11 JHNDMB004MRE0 DOOR HANDLE KB 6525PS 1 BL 5 1 11 JHNDMB005MRT0 DOOR HANDLE KB 6525PK 1 BL 5 1 11 JHNDMB006MRT0 DOOR HANDLE KB 6525PW 1 BL 5 1 12 PSPA B006MRF0 DOOR HANDLE MOUNT KB 6524PS PK KB 6525PS PK 2 AU ...

Page 31: ...B C D E F G H DRAWER CONTROL PANEL Must be placed behind middle tab behind Control Unit 3 4 3 1 3 2 3 3 3 2 3 4 3 1 3 5 4 2 4 6 4 6 5 1 2 5 1 7 5 1 10 5 1 10 5 1 4 5 1 8 5 1 5 5 1 5 5 1 8 5 1 9 5 1 5 1 1 5 1 11 5 1 12 5 1 12 5 1 6 5 1 6 5 1 13 5 1 13 5 1 3 5 1 9 5 1 9 6 9 6 6 ...

Page 32: ... 10 7 1 7 10 7 13 7 13 4 7 7 13 7 13 7 1 X4 1 6 7 3 7 3 7 5 4 14 7 5 7 8 4 9 4 25 4 13 7 13 7 11 4 17 4 15 4 15 4 23 4 4 4 30 4 33 4 32 4 29 7 2 7 4 1 8 1 15 4 18 7 13 1 9 7 13 4 16 7 13 1 10 7 10 1 11 7 7 1 11 7 7 7 1 7 13 4 1 4 8 7 6 7 8 X2 4 13 7 13 7 12 1 2 7 13 1 3 4 12 Knockout for Auto Drawer Gear Replacement 6 4 6 5 6 5 6 7 6 8 Actual wire harness may be different from illustration 1 14 7 ...

Page 33: ...PW DRAWER CABINET Knockout for Oven lamp Replacement 2 3 2 3 2 3 2 3 KB6525P KB6524P KB6525P KB6524P 7 13 7 13 7 13 7 13 7 13 2 2 1 4 2 4 7 13 7 13 7 13 7 13 7 13 7 13 2 1 6 10 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 34: ...W PACKING PARTS INSTALLION SHEET OPERATION MANUAL WOOD SCREWS 6 3 6 1 6 2 SUPPORT CORNERS Non replaceable items TOP FOAM SUPPORT CORNERS BOTTOM FOAM SUPPORT CORNERS SUPPORT CORNERS TOP FOAM PACKING CASE DRAWER SUPPORTS CROSS SUPPORTS ...

Page 35: ...35 KB 6525PS KB 6525PK KB 6525PW NOTES ...

Page 36: ...HARP CORPORATION ALL RIGHTS RESERVED Nopartofthispublicationmaybereproduced 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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