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KB-6025MS

KB-6025MK

KB-6025MW

1.  Precautions for Handling Electronic Components
  This unit uses CMOS LSI in the integral part of the circuits. 

When handling these parts, the following precautions 
should be strictly followed. CMOS LSI have extremely 
high impedance at its input and output terminals. For 
this reason, it is easily influenced by the surrounding 
high voltage power source, static electricity charge in 
clothes, etc. and sometimes it is not fully protected by 
the built-in protection circuit.

  In order to protect CMOS LSI.
)  When storing and transporting, thoroughly wrap them 

in aluminium foil. Also wrap all PW boards containing 
them in aluminium foil.

2)  When  soldering,  ground  the  technician  as  shown  in 

the figure and use grounded soldering iron and work 
table.

2.  Servicing of Touch Control Panel
  We describe the procedures to permit servicing of the 

touch  control  panel  of  the  microwave  oven  and  the 
precautions you must take when doing so. To perform the 
servicing, power to the touch control panel is available 
either from the power line of the oven itself or from an 
external power source.

(1) Servicing the touch control panel with power supply 

of the oven:

 

CAUTION: 

  THE  HIGH  VOLTAGE  TRANSFORMER  OF  THE 

MICROWAVE  OVEN  IS  STILL  LIVE  DURING 
SERVICING AND  PRESENTS A HAZARD.

  Therefore, before checking the performance of the touch 

control panel,
)  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  insulation 
tape.

6)  After  that  procedure,  re-connect  the  power  supply 

cord.

  After  checking  the  performance  of  the  touch  control 

panel,
) Disconnect the power supply cord.
2) Open the door and block it open.
3)  Re-connect  the  leads  to  the  primary  of  the  power 

transformer.

4)  Re-install the outer case (cabinet).
5)  Re-connect  the  power  supply  cord  after  the  outer 

case is installed.

6)  Run the oven and check all functions.

TOUCH CONTROL PANEL SERVICING

A. On some models, the power supply cord between the 

touch control panel and the 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 long enough 
that they may be separated from each other. For those 
models, 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 with a jumper, which activates an operational state 
that is equivalent to the oven door being closed. As for 
the sensor-related controls of the touch control panel, 
checking  them  is  possible  if  dummy  resistor(s)  with 
resistance equal to that of the controls are used.

(2) Servicing the touch control panel with power supply 

from an external power source:

  Disconnect the touch control panel completely from the 

oven proper, and short both ends of the door sensing 
switch  (on  PWB)  of  the  touch  control  panel,  which 
activates an operational state that is equivalent to the 
oven  door  being  closed.  Connect  an  external  power 
source to the power input terminal of the touch control 
panel, then it is possible to check and repair the controls 
of the touch control panel it is also 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.
)  Soldering iron: 30W
  (It is recommended to use a soldering iron with a 

grounding terminal.)

2)  Oscilloscope:  Single  beam,  frequency  range:  DC-

0MHz type or more advanced model.

3)  Others: Hand tools

4.  Other Precautions

)  Before turning on the power source of the control 

unit, remove the aluminium foil applied for preventing 
static electricity.

2)  Connect the connectors of the key unit to the control 

unit being sure that the lead wires are not twisted.

3)  After  aluminium  foil  is  removed,  be  careful  that 

abnormal voltage due to static electricity etc. is not 
applied to the input or output terminals.

4)  Attach  connectors,  electrolytic  capacitors,  etc.  to 

PWB, making sure that all connections are tight.

5)  Be  sure  to  use  specified  components  where  high 

precision is required.

approx. M ohm

Содержание KB-6024MK

Страница 1: ...Power Transformer High Voltage Rectifier and Heat sink etc and Magnetron High Voltage Harness etc S27M275KB6025 KB 6025MS MK MW 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 BEFORE SERVICING INSIDE FRONT COVER WARNING TO SERVICE PERSONNEL 3 MICROWAVE ME...

Страница 2: ...ion 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 Micr...

Страница 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 ...

Страница 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...

Страница 5: ... 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 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 f...

Страница 6: ...owave 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 10 of Full Power P 0 No power throughout the cooking time START...

Страница 7: ...all applicable codes and ordinances Where a two pronged wall receptacle is encountered it is the personal responsibility and obligation of the customer to con tact 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 an extension cord must be used it should be a 3 wire 15 amp or higher rat...

Страница 8: ... 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 the drawer so that ...

Страница 9: ...e 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 microwaveenergyisproducedandfirst...

Страница 10: ...250V NO IS E F IL T E R N L 120V AC 60 Hz L O W V O L T A G E FM OL SM DM N C COM C OM N O H N WHT RED GND G R N WHT WHT R E D OR G B LK OR G WHT BLK OR G C N501 3 C N501 1 RY5 T R A NS F O R ME R C N502 2 C N502 1 C N502 3 R E D B LK R E D OR G YLW BLK BLU GR N GR N GR N GR N GR N GR N GR Y WHT BLU G R N G R N R E D R E D R E D R E D OR G OR G GR Y B LK OR G OR G BLK WHT GR Y BR N BLK WHT WHT WHT...

Страница 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...

Страница 12: ...r 8 Disconnect the power supply cord and then remove outer case 9 Open the door and block it open 10 Discharge high voltage capacitor 2 Open the drawer and block it open 3 Discharge high voltage capacitor 4 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 sensing switch stop switch operates properly th...

Страница 13: ...he varistor has been burned replace the power unit 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 th...

Страница 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 pads 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...

Страница 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 ...

Страница 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...

Страница 17: ...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 defective and both the monitor switch plu...

Страница 18: ...EASURE 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 BEFOREREPLACINGABLOWNMONITORFUSE...

Страница 19: ...state when power is supplied 5 Indicator Circuit A circuit to drive the Liquid Crystal Displays LCD1 6 Power Source Circuit This circuit generates voltages necessary in the control unit from the AC line voltage In addition the synchronizing signal is available in order to compose a basic standard time in the clock circuit Symbol Voltage Application VC 5V LSI IC1 7 Relay Circuit A circuit to drive ...

Страница 20: ...rnal clock oscillation frequency control output Output to control oscillation input of Xin 14 VCC IN Power source voltage 5V VC voltage of power source circuit input 15 P60 IN Plus signal coming from the Microwave drawer door open close motor is input into P60 as revolution number 16 P37 IN Input signal which communicates the drawer door open information to LSI from the door position switch front ...

Страница 21: ... of J 11 line key on matrix is touched 39 P15 OUT Key strobe signal Signal applied to touch key section A pulse signal is input to P20 P23 terminal while one of J 10 line key on matrix is touched 40 P14 OUT Key strobe signal Signal applied to touch key section A pulse signal is input to P20 P23 terminal while one of J 9 line key on matrix is touched 41 P13 OUT Key strobe signal Signal applied to t...

Страница 22: ...V 60 INT0 IN Signal to synchronize LSI with commercial power source frequency This is the basic timing for all real time processing of LSI 61 AVSS IN A D converter power source voltage The power source voltage to drive the A D converter in the LSI 62 VREF IN Reference voltage input terminal A reference voltage applied to the A D converter in the LSI Connected to 5V 63 AN7 IN AH sensor input This i...

Страница 23: ...such 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 Cookingmod...

Страница 24: ...trol panel and the 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 long enough that they may be separated from each other For those models it is possibl...

Страница 25: ... 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 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 ...

Страница 26: ... 2 Hot parts Ovenlamp Magnetron Highvoltagetransformerand 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 Vis...

Страница 27: ...o access the 4 mounting screws holding the unit on to the wall or cabinet opening Fig 1 3 Close Drawer and carefully pull the unit out from opening and unplug the power supply cord 4 Remove top cover Fig 2 5 Remove air cover from back of unit then both side panels Fig 2 6 Remove exhaust duct and back cover Fig 2 NOTE You now have access to various components for the Drawer WARNING Follow all safet...

Страница 28: ... REPLACEMENT 1 Un hook the black and white AC terminals from the Noise Filter PWB and green ground wire from the back plate Fig 4 2 Attach the black and white AC terminals from the new Power Cord to the Noise Filter as shown in figure 4 Fig 4 Note The green ground wire terminal can be attached when reassembling the back plate to the drawer cavity Un hook Attach Black AC Wire to Top Terminal Attach...

Страница 29: ... 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 secondary interlock switch is activated with the drawer closed The horizontal position of the latch hook should be adjusted so that the monitor switch and drawer sensing switch are activated with the drawer closed 8 Secure the screws with washers firmly 9...

Страница 30: ...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 latch holes an...

Страница 31: ...SWITCH ANGLE REMOVAL Fig S 1 Fig S 2 ACTUATOR REMOVAL ADJUSTMENT 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 Locate either the right or left actuator and remove the 2 screws holding the actuator to the door support angles 5 Relpace with the new actuator Fig A 3 Actuator adjustment ...

Страница 32: ...re set into the cavity angle correctly before tightening screws careful not to touch PWB 1 Follow the Microwave Drawer disassembly as previously stated above 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 SUPPORT ANGLE REMOVAL 5 Remove the 3 screws holding the Rack Gear to the bottom sli...

Страница 33: ...ER BOARD N H WHT RED CONTROL UNIT CNK CNM CNN CNE SWITCHING POWER SUPPLY CN501 CN502 T1 1 2 3 4 5 GRN BLU WHT CNM RY1 N O RY1 COM RY2 N O RY2 COM 1 2 3 4 5 6 7 BLK WHT BRN CNA BLK ORG BLK RED ORG ORG ORG GRN BLK 1 2 3 CNB GRY 1 2 3 CN501 BLK GRY GRY 1 2 3 4 5 BLU BLK RED CNN YLW 1 2 3 CNE BLK RED 1 2 3 4 5 6 7 GRY WHT CNK 8 GRY GRY GRY GRY GRY GRY 1 2 3 4 5 6 7 GRY RED WHT CNH 9 8 10 11 GRY GRY GR...

Страница 34: ...RY2 COM N O D7 RY1 COM N O D10 RY3 D11 RY4 D12 RY5 H 1 H 3 H 2 H 4 H 5 H 7 H 6 AC 120V MICRO COM O L FM SM 0 1uF 50V NOTE IF NOT SPECIFIED 1SS270A 10G471K A 5 A 1 H 8 1 3 8 5 B 1 C10 C11 NOT INSERT PARTS T1 VR GND INT 0 1u 250V R10 1 2W 120 R11 1 2W 120 0 1u 250V A 7 A 3 B 3 SW Reg PWR D4 D3 D2 D1 H 9 H 11 K 1 K 3 K 2 K 8 502 3 E 3 K 4 K 6 K 5 K 7 J10 SW Reg OUT 24V J11 CN H CHECK POINTS ...

Страница 35: ...5 4 7K R56 C52 M 5 4 7K 10K 10K R58 C51 R55 R57 SP D19 D20 Q22 Q21 C20 C21 Q20 AN5 CF1 4MHz 1 2 3 7 5 6 CONTROL UNIT 4 7K R13 4 7K R12 P05 P51 P57 C3 S22 S23 SEG22 SEG23 COM2 10uF 35V VR GND INT 47K C5 C4 S24 R69 R68 3 3K 1 5K C3 R52 10uF 35V C8 KIA78L05BP Q4 O C I C7 C6 10uF 35V R8 KRA224S KRA117S 10uF 35V 200 1w x2 2W C12 CN K M 2 CN M KTC1027 KTC1027 AN4 K 4 KRC101S KRC101S KTC3875 LCD COM0 COM...

Страница 36: ... 2 3 A B C D E F G H A B C D E F G H Figure S 4 Printed Wiring Board of Power Unit 2 5A 3 1 2 FUSE T1 4 8 D3 ZD1 J10 RY1 D12 RY5 DIP CNH Q1 R1 D2 D1 1 11 D4 1 1 R10 C10 RY2 1 3 P 3 D11 D10 7 CNA CNB C11 R11 RY4 RY3 COM COM N O N O C1 C2 R3 J11 D7 D5 VRS1 ...

Страница 37: ...6 K SP C0 S0 S0 S24 C4 C5 R29 CF2 S24 C4 C5 C3 S0 C0 SP C90 C8 C6 C5 C3 C21 R27 R26 R28 C90 C90 R98 R96 R99 R95 D96 K D95 K D97 K Q97 R97 R41 J2 J1 J4 J6 K J3 C5 C6 D19 K D20 K ZD2 R7 1 1 8 6 Q26 WHA Q23 Q21 Q25 Q22 1 7 Q20 R8 Q4 C51 R56 R55 C22 C23 C52 R21 R24 R58 R20 R23 R57 R47 R48 R49 Q6 64 R45 49 48 33 17 32 R51 R52 R50 12 2 11 1 CNJ R40 R36 R38 R37 R35 IC5 IC6 C43 R44 R43 C42 Q96 Q95 LCD 5 1...

Страница 38: ...Key unit KB6025MW 1 AS 1 3 FPNLCB533MRK0 M C P frame assy KB6024MS 1 AX 1 3 FPNLCB527MRK0 M C P frame assy KB6024MK 1 AX 1 3 FPNLCB528MRK0 M C P frame assy KB6024MW 1 AX 1 3 FPNLCB534MRK0 M C P frame assy KB6025MS 1 AY 1 3 FPNLCB504MRK0 M C P frame assy KB6025MK 1 AY 1 3 FPNLCB505MRK0 M C P frame assy KB6025MW 1 AY 1 4 PCOVPB140MRP0 M C P cover 1 AM 1 5 PCUSUB106MRP0 M C P cushion KB6024MS MK MW o...

Страница 39: ...K MW 1 AQ 2 2 LANG B027MRP0 M Air guide L KB6025MS MK MW 1 AL 2 3 LANG B047MRP0 M Air guide R KB6024MS MK MW KB6025MS MK MW 1 AN 2 4 PSKR B023MRP0 M Partition angle KB6024MS MK MW 1 AH 2 4 PSKR B024MRP0 M Partition angle KB6025MS MK MW 1 AK 2 5 PCUSUB104MRP0 M Bottom cushion A KB6024MS MK MW 1 AB 2 5 PCUSUB062MRP0 M Bottom cushion A KB6025MS MK MW 1 AB 2 6 PCUSGB063MRP0 M Bottom cushion B KB6024MS...

Страница 40: ...angle KB6024MS MK MW 1 AH 3 24 LANGTB076MRP0A M Partition angle KB6025MS MK MW 1 AB 3 25 FC QZB052MRK0A M HVC assy 1 AP 3 26 LBNDKB007MRP0 M HVC band 1 AB 3 27 XCBS730P08000 M Screw 3 AB 3 28 XOTS740P12000 M Screw 79 AA 3 29 PCOVPB169MRP0A M Top cover KB6024MS MK MW 1 AE 3 29 PCOVPB142MRP0 M Top cover KB6025MS MK MW 1 AW 3 30 TLAB B063MRR0 M Menu label 1 AD 3 31 XOTS740P12RV0 M Screw 4 AB 3 32 XEP...

Страница 41: ...KB6024MK 1 AT 3 61 PDIF B064MRF0 M Louver KB6024MW 1 AS 3 61 PDIF B053MRT0 M Louver KB6025MS 1 AX 3 61 PDIF B054MRT0 M Louver KB6025MK 1 AT 3 61 PDIF B055MRT0 M Louver KB6025MW 1 AU 3 62 RMOTDA262WRZZ M Stirrer motor 4 AH 3 63 TCAUHB009MRR0 M User caution label 1 AA 3 64 FANGTB019MRK0 M Auto drawer gear assy 1 BL 3 65 LANGTB217MRP0 M Switch angle L 2 AC 3 66 MACT B003MRF0 M Actuator R 1 AD 3 67 MA...

Страница 42: ...3 48 3 29 3 22 3 1 3 15 3 24 3 25 3 26 3 62 3 44 3 45 3 56 3 46 3 11 3 14 3 13 3 18 3 32 3 76 3 32 3 41 3 41 3 42 3 42 3 41 3 28 3 28 3 28 3 28 3 28 3 28 3 27 3 28 3 28 3 27 3 42 3 28 3 28 3 32 3 28 3 28 3 28 3 28 3 28 3 28 3 28 3 28 3 10 3 10 3 10 3 28 3 6 3 6 3 38 3 4 3 66 3 67 3 65 3 70 3 28 3 28 3 69 3 78 3 27 3 64 3 28 3 68 3 71 3 55 3 46 3 28 3 40 3 49 3 28 3 28 3 28 3 28 3 53 3 53 3 28 3 59...

Страница 43: ...Section REF NO PART NO DESCRIPTION Q TY CODE 4 1 TINSEB473MRK0 M Operation manual 1 AL 4 2 TINSEB474MRR0 M Installation instructions 1 AE 4 3 XTPUW50P35000 M Wood screws 4 AC INSTALLION SHEET OPERATION MANUAL WOOD SCREWS 4 3 4 1 4 2 SUPPORT CORNERS PACKING CASE SUPPORT CORNERS SUPPORT CORNERS SUPPORT CORNERS BOTTOM COVER TOP COVER Non replaceable items TOP FOAM PALLET BOTTOM FOAM ...

Страница 44: ... COPYRIGHT 2007 BY SHARP 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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