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R-895M - 36

Figure S-2. Power Unit Circuit

E 1

WH1-3

WH1-6

WH1-9

WH1-5

WH1-8

WH1-1

WH1-2

WH1-n

WH1-10

WH1-12

WH1-13

WH1-14

WH1-15

WH1-11

E 3

E 5

E 7

AC230-240V
50Hz

FAN MOTOR

OVEN
THERMISTOR

GND

R3 510 1w

R6 200 1w

Q2
KTA1274

Q3
KRC243M

R4 510 1w

D11-D14
1N4005E
or
1N4004S

RY5

D11

D12

D13

D14

VRS1

(J1)

(J2)

RY6

RY1

1.5k

ZD2

HZ20-1

RY4

RY3

RY2

10G471K

C2 1000

/35v

C4 10

/35v

R5 3.3k

SP1

BUZZER

INT
POWER
CONTROL

STOP
SWITCH

BOTTOM
HEATING
ELEMENT

GRILL
HEATING
ELEMENT

HIGH VOLTAGE
TRANSFORMER

STOP
SWITCH

OVEN LAMP
TURNTABLE
MOTOR

DOOR OPEN

CONTACT

A 1

A 3

A 5

C 3

A 7

N O

COM

B 2

B 1

NOTE 1.

NOTE 2.

–

WH1-7

CONVECTION
MOTOR

RY7

A 9

: IF NOT SPECIFIED, 1/4W

15P WIRE HARNESS

: IF NOT SPECIFIED, 0.1

F / 50V

: IF NOT SPECIFIED, 1SS270A

C 1

WH1-4

POWER UNIT CIRCUIT

DIAGRAM

Summary of Contents for R-895(AL)M

Page 1: ...4 MICROWAVE MEASUREMENT 30 SCHEMATIC DIAGRAMS 31 PICTORIAL DIAGRAM 35 POWER UNIT CIRCUIT DIAGRAM 36 CPU UNIT CIRCUIT DIAGRAM 37 PRINTED WIRING BOARD OF POWER UNIT DIAGRAM 38 PARTS LIST 39 EXPLODED DIAGRAM OF OVEN PARTS 41 CONTROL PANEL DOOR PARTS 42 MISCELLANEOUS PACKING ACCESSORIES 43 S70224R895M MICROWAVE OVEN WITH GRILL AND CONVECTION MODEL R 895 AL M In interests of user safety the oven should...

Page 2: ...1 7 7 7 6 1 3 7 6 7 18 6 5 1 3 7 6 1 2 1 20 1 16 1 14 1 15 7 17 7 18 7 18 7 10 7 17 4 7 7 6 6 3 6 5 7 14 7 1 1 10 4 16 1 7 1 17 4 13 4 12 1 4 7 6 7 19 4 29 4 20 7 18 7 18 2 4 2 5 2 5 4 9 4 31 7 3 1 19 4 2 4 15 7 5 7 2 7 2 1 21 7 5 4 10 4 22 4 17 4 11 4 8 6 4 4 23 1 9 1 6 1 5 1 12 6 6 2 2 2 1 1 13 7 5 NOTE In the event of removing the turn table motor cover this part should be refitted using screw ...

Page 3: ...R 895M 42 CONTROL PANEL PARTS DOOR PARTS CONTROL PANEL AND DOOR PARTS 3 4 3 2 3 7 3 7 3 7 3 5 3 6 3 1 3 3 5 4 5 6 5 7 5 8 5 3 5 12 5 11 5 1 5 9 5 9 5 10 5 2 5 5 5 10 ...

Page 4: ...ROTECTION SHEET SPADPA024URE0 BOX MODEL LABEL TLAB A310URR0 INTO THE OVEN CAVITY LOW RACK HIGH RACK COPYRIGHT 2002 BY SHARP CORPORATION ALL RIGHTS RESERVED No part of this publication may be reproduced 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 MISCELLANEOUS Actua...

Page 5: ... CN C 1 AB 3 1D QCNCMA230DRE0 U 4 pin connector CN E 1 AC 3 1E FW VZA266DREZ U 15pin wire harness WH 1 1 AH C1 RC KZA087DRE0 U Capacitor 0 1 uF 50V 1 AB C2 VCEAG31VW108M U Capacitor 1000 uF 35V 1 AE C3 RC KZA087DRE0 U Capacitor 0 1 uF 50V 1 AB C4 5 VCEAG31VW106M U Capacitor 10 uF 35V 2 AB D1 7 VHD1SS270A 1 U Diode 1SS270A 7 AA D11 14 VHD1N4005E 2 U Diode 1N4005E 4 AA D11 14 VHD1N4004S 1T U Diode 1...

Page 6: ...atch spring 1 AC 5 6 PGLSPA027URE0 U Front door glass 1 AN 5 7 JHNDPA012URT0 U Door handle A 1 AK 5 8 JHNDPA013URT0 U Door handle B 1 AR 5 9 XETSD40P30000 U Screw 4mm x 30mm 2 AA 5 10 XEBSD30P08000 U Screw 3mm x 8mm 3 AA 5 11 XEBSD30P06000 U Screw 3mm x 6mm 4 AA 5 12 GCOVHA365WRF3 U Choke cover 1 AM MISCELLANEOUS 6 1 FAMI A072WRK2 U High rack 1 AT 6 2 FAMI A095WRK1 U Low rack 1 AR 6 3 LHLDKA008WRF...

Page 7: ...l the parts marked on parts list are used at voltages more than 250V Removal of the outer wrap gives access to potentials above 250V All the parts marked on parts list may cause undue microwave exposure by themselves or when they are damaged loosened or removed Never operate the Grill and or Bottom heater with the oven outer cabinet removed Because air flow is eliminated and the excess heat genera...

Page 8: ... 3D checks and reconnect the leads to the primary of the High voltage transformer SERVICING WARNING TO SERVICE PERSONNEL Microwave ovens contain circuitry capable of producing very high voltage and current contact with following parts will result in electrocution High voltage capacitor High voltage transformer Magnetron High voltage rectifier assembly High voltage harness REMEMBER TO CHECK 4R 1 Re...

Page 9: ...urntable diameter 325 mm Control Complement Touch Control System Clock 1 00 12 59 Timer 0 99 minutes 90 sec Microwave Power for Variable Cooking Repetition Rate 100 HIGH Full power throughout the cooking time 70 MEDIUM HIGH approx 70 of FULL Power 50 MEDIUM approx 50 of FULL Power 30 MEDIUM LOW approx 30 of FULL Power 10 LOW approx 10 of FULL Power Convection temperature control range 250 C 230 C ...

Page 10: ...ndicator BOTTOM GRILL indicator CONVECTION indicator COOK indicator MICROWAVE indicator WEIGHT indicators LESS MORE indicators DIGITAL DISPLAY INFO indicator MICROWAVE POWER LEVEL indicator DIGITAL DISPLAY TIME keys PIZZA key EXPRESS COOK keys EXPRESS DEFROST keys MEAL IN ONE keys LESS MORE keys INFO key START AUTO MINUTE key DUAL CONV GRILL key CONV C key BREAKFAST key POWER LEVEL key WEIGHT keys...

Page 11: ...h COM NC Opened Closed Stop switch COM NO Closed Opened COM NO Closed Opened Monitor Switch COM NC Opened Closed The circuit to the high voltage transformer is cut off when the contacts of relay RY2 and the contacts COM NO of the monitored latch switch and monitor switch are made open The circuit to the fan motor is cut off when the relay RY6 is made open The circuit to the turntable motor is cut ...

Page 12: ...en Program desired cooking time by touching the TIME keys and program convection temperature by touching the CONVECTION TEMPERATURE key When the START key is touched the following operations occur 1 The numbers on the digital readout start the count down to zero 2 The oven lamp cooling fan motor turntable motor and convection motor are energized NOTE When the convection temperature 40 C is se lect...

Page 13: ...l operate in accordance with following specification Thepowerlevelisnotreduced1timecooking Butonlyincasesamemenuisrepeatedwithin 1min 15sec the power level of micro and grill is reduced from 100 to 70 in 20mins after starting of last cooking Even if the time of the last cooking is longer than 20mins the power level isn t reduced on the last cooking and it is reduced from the beginning of the next ...

Page 14: ... 50 50 40 30 20 MICRO 10 30 50 COOLING FAN 100 CONV FAN 100 0 NOTE The oven temp was checked by the thermometer when each stages are started If the oven temp is same or higher than 105 C the oven was judged as with preheating When the oven temp is lower than 105 C or the cooling fan stops the oven was judged as without preheating The cooling fan continues to rotate when Oven temperature is more th...

Page 15: ...ut out will open and line voltage to the high voltage transformer will cut off and operation of the magnetron will be stopped The defec tive thermal cut out must be replaced with a new one THERMAL CUT OUT 145 C OVEN Thisthermalcut outprotectsagainstoverheating fireinside theoven Thecut outcontactswillopenwhentemperatures exceed 145 C When the cut out cools itself down to the operating temperature ...

Page 16: ...ll shut down at low temperature less than 105 o C FIRE SENSING FEATURE The oven will stop its operation when there is a fire in the oven cavity in microwave cooking condition LSI measures the voltage across the temperature meas urement circuit intermittently within 32 seconds time base since the oven is started in microwave cooking condition The oven will stop its operation when the difference of ...

Page 17: ...de does not heat Oven seems to be operating but the temperature in the oven cavity is lower or higher than preset one Grill heating element does operate Oven goes into cook cycle but shuts down before end of cooking cycle Oven seems to be operating but little or no heat is produced in oven load Microwave power does not seem to be generated properly Oven seems to be operating but the temperature in...

Page 18: ...est method must be used Alternative simplified method 1 Place 2 litres of cold water between 12 C and 20 C in a suitable container 2 Stir the water and measure the temperature in C Note temperature as T1 3 Place the container in the microwave and heat the water for 1 minute and 36 seconds on full power NOTE The operation time of the microwave oven includes 3 sec 3 sec is magnetron filament heat up...

Page 19: ...oltage transformer Disconnect the filament and secondary winding connections from the rest of the HV circuitry Using an ohmmeter set on a low range it is possible to check the continuity of all three winding The following readings should be obtained a Primary winding approximately 1 9 Ω b Secondary winding approximately 124 Ω c Filament winding less than 1 Ω If the readings obtained are not stated...

Page 20: ...minal Connection of Switch Plunger Operation COM to NO COM to NC Released Open circuit Short circuit Depressed Short circuit Open circuit COM Common terminal NO Normally open terminal NC Normally close terminal If incorrect readings are obtained replace the switch CARRY OUT 4R CHECKS CARRY OUT 3D CHECKS Isolate the switch to be tested and using an ohmmeter check between the terminals as described ...

Page 21: ...value replacement L min Cx 20 Cy 20 R1 R2 1 0mH 0 22µF 4700pF 10 MΩ 680kΩ MEASURING POINTS INDICATION OF OHMMETER Between N and L Approx 680 kΩ Between terminal N and WHITE Short circuit Between terminal L and RED Short circuit If incorrect readings are absorbed replace the noise filter unit CARRY OUT 4R CHECKS L GRILL HEATING ELEMENT TOP AND BOTTOM HEATING ELEMENTS TEST CARRY OUT 3D CHECKS Before...

Page 22: ...ators do not light up g The figure of all digits flicker 2 3 Other possible troubles caused by defective control unit a Buzzer does not sound or continues to sound b Clock does not operate properly c Cooking is not possible d Proper temperature measurement is not obtained PROCEDURE LETTER COMPONENT TEST N KEY UNIT TEST If the display fails to clear when the STOP CLEAR pad is depressed first verify...

Page 23: ...dded to the input circuit on the PWB this foil pattern acts as a fuse If the foil pattern is open follow the troubleshooting guide given below for repair Problem POWER ON indicator does not light up CARRY OUT 3D CHECKS STEPS OCCURRENCE CAUSE OR CORRECTION 1 The rated AC voltage is not present between Check supply voltage and oven power cord Pin Nos 1 and 3 of the 4 pin connector E 2 The rated AC v...

Page 24: ...gnal Circuit The power source synchronizing signal is available in order to compose a basic standard time in the clock circuit It accompanies a very small error because it works on commercial frequency TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL 4 Reset Circuit A circuit to generate a signal which resets the LSI to the initial state when power is supplied 5 Buzzer Circuit The buzze...

Page 25: ...nput into P51 18 P50 IN Signal similar to P53 When any one of G9 line keys on key matrix is touched a corresponding signal will be input into P50 19 22 P47 P44 IN OUT Terminal not used 23 TOUT OUT Signal to sound buzzer A Tact switch touch sound B Completion sound C Whenthetemperatureoftheovencavity reaches the preset temperature in the preheating mode or when the preheating hold time 30 minutes i...

Page 26: ...level 36 XCIN IN Connected to VC 37 XCOUT OUT Terminal not used 38 XIN IN Internal clock oscillation frequency input setting The internal clock frequency is set by inserting the ceramic filter oscillation circuit with respect to XOUT terminal 39 XOUT OUT Internal clock oscillation frequency control output Output to control oscillation input of XIN 40 VSS IN Power source voltage 5V VC voltage of po...

Page 27: ...83 SEG32 44 SEG28 62 SEG12 12 SEG 8 82 SEG31 43 SEG29 61 SEG11 11 SEG10 80 SEG30 30 SEG30 60 SEG10 10 SEG11 79 SEG29 29 SEG31 59 SEG 9 9 SEG12 78 SEG28 28 SEG32 58 SEG 8 8 SEG13 77 SEG27 27 SEG33 57 SEG 7 7 SEG14 76 SEG26 26 SEG34 56 SEG 6 6 SEG15 75 SEG25 25 SEG35 55 SEG 5 5 SEG16 74 SEG24 24 SEG36 54 SEG 4 4 SEG17 73 SEG23 23 SEG37 53 SEG 3 3 SEG18 72 SEG22 22 SEG38 52 SEG 2 2 SEG19 71 SEG21 21 ...

Page 28: ...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 is long enough that they may be separated from each other For those models therefore it is possible to check and...

Page 29: ...ire case from the oven HIGH VOLTAGE COMPONENTS REMOVAL HIGH VOLTAGE CAPACITOR AND HIGH VOLTAGE RECTIFIER ASSEMBLY COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE To prevent an electric shock take the following measures 1 Before wiring 1 Disconnect the power supply 2 Open the door and wedge the door open 3 Discharge the high voltage capacitor and wait for 60 seconds 2 Don t let the wire leads touch ...

Page 30: ...de as the fixing hole may be oversize 12 Removethetwo 2 screws holdingthefanmotortothe fan duct 13 Now the fan motor is free INSTALLATION 1 Install the the fan motor to the fan duct with the two 2 screws 2 Install the fan blade to the fan motor shaft according to the following procedure 1 Hold the centre of the bracket which supports the shaft of the fan motor on a flat table 2 Apply the screw loc...

Page 31: ...to the base plate with cutting pliers as shown in Figure C 2 a CAUTION DO NOT DROP THE TURNTABLE MOTOR COVER INTO THE OVEN AFTER CUTTING THE BRIDGES BECAUSE IT WILL DAM AGE THE WIRE LEADS OF THE MOTOR AND IT IS DIFFICULT TO REMOVE IT OUT OF THE OVEN 5 Remove the turntable motor cover from the base plate 6 Disconnect the wire leads from the turntable motor 7 Remove the one 1 screw holding the turnt...

Page 32: ...top heating element 3 Remove the two 2 screws holding the two 2 grill heater angles to the top of the oven cavity 4 Remove the two 2 grill heater angles from the oven cavity 5 Remove the top heating element from the top of the oven cavity 6 Now the top heating element is free Figure C 4 a Replacement of Power Supply Cord Figure C 4 b Power Supply Cord Replacement BOTTOM HEATING ELEMENT REMOVAL MON...

Page 33: ...witch and the monitored latch switch open within 1 8mm gap be tween right side of cavity face plate and door when door is opened 3 Whenthedoorisclosed thecontacts COM NO ofthe stop switch close 4 When the door is closed the contacts COM NC of the monitor switch and monitored latch switch open And the contacts COM NO of their switches close 5 Re install outer case and check for microwave leakage ar...

Page 34: ...ds Refer to Microwave Measurement Procedure After any service make sure of the following 1 Door latch heads smoothly catch latch hook through latch holes and that latch head goes through centre 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 leaka...

Page 35: ...r s instructions and any spacers are fitted to ensure that measurement is taken 5cm from the surface of the oven PROCEDURE 1 Place the beaker containing the water load in the oven cavity at the centre of the turntable The placing of this standard load in the oven is important not only to protect the oven but also to ensure that any leakage itisnotdisguisedbytoolargealoadabsorbingenergy 2 Close the...

Page 36: ...AGE TRANSFORMER T C TRANSFORMER CAPACITOR 1 13 µF AC2100V CONTROL UNIT A9 A7 RY7 RY5 COM COM COM N O N O COM N O N O A3 E1 E3 E5 E7 A1 B2 C3 C1 A5 B1 STOP SWITCH MONITORED LATCH SWITCH THERMISTOR MG THERMAL CUT OUT OVEN THERMAL CUT OUT MONITOR SWITCH 4700p 250V 4700p 250V 10M 0 5W NOISE SUPPRESSION COIL 680 k 0 5W 0 22µ 250V FUSE 20A FUSE F8A NOISE FILTER L N 230 240V 50Hz BRN 15 BLU 15 G Y 15 EAR...

Page 37: ... HEATING ELEMENT H V RECTIFIER MAGNETRON HIGH VOLTAGE TRANSFORMER T C TRANSFORMER CAPACITOR 1 13 µF AC2100V CONTROL UNIT A9 A7 RY7 RY5 COM COM COM N O N O COM N O N O A3 E1 E3 E5 E7 A1 B2 C3 C1 A5 B1 STOP SWITCH MONITORED LATCH SWITCH THERMISTOR MG THERMAL CUT OUT OVEN THERMAL CUT OUT MONITOR SWITCH 4700p 250V 4700p 250V 10M 0 5W NOISE SUPPRESSION COIL 680 k 0 5W 0 22µ 250V FUSE 20A FUSE F8A NOISE...

Page 38: ...ORMER CAPACITOR 1 13 µF AC2100V CONTROL UNIT A9 A7 RY7 RY5 COM COM COM N O N O COM N O N O A3 E1 E3 E5 E7 A1 B2 C3 C1 A5 B1 STOP SWITCH MONITORED LATCH SWITCH THERMISTOR MG THERMAL CUT OUT OVEN THERMAL CUT OUT MONITOR SWITCH 4700p 250V 4700p 250V 10M 0 5W NOISE SUPPRESSION COIL 680 k 0 5W 0 22µ 250V FUSE 20A FUSE F8A NOISE FILTER L N 230 240V 50Hz BRN 15 BLU 15 G Y 15 EARTH LIVE NEUTRAL NC NC ASYM...

Page 39: ... C3 C1 A5 B1 STOP SWITCH MONITORED LATCH SWITCH THERMISTOR MG THERMAL CUT OUT OVEN THERMAL CUT OUT MONITOR SWITCH 4700p 250V 4700p 250V 10M 0 5W NOISE SUPPRESSION COIL 680 k 0 5W 0 22µ 250V FUSE20A FUSE F8A NOISE FILTER L N 230 240V 50Hz BRN 15 BLU 15 G Y 15 EARTH LIVE NEUTRAL NC NC ASYMMETRIC RECTIFIER RY6 RY1 RY2 RY3 RY4 FM OL CM TTM OVEN LAMP CONVECTION MOTOR FAN MOTOR TURNTABLE MOTOR TOP GRILL...

Page 40: ...W1 MONITORED LATCH SWITCH ORG ORG BLU BRN BRN RED RED RED RED ORG RED BLK BLU GRY CN A 1 CN B 2 RED GRN RED GRY GRY ORG RED NOISE FILTER L TP F 8 A TL RED 20 A WHT N ORG ORG 1 BLU 2 3 BRN 4 5 ORG 6 7 RED FM FAN MOTOR GRY RED WHT HIGH VOLTAGE COMPONENTS G Y POWER SUPPLY CORD NEUTRAL LIVE EARTH CN B 1 12 2 1 SP1 RY2 RY4 RY3 CONTROL PANEL CN A CN E RY5 1 1 7 9 CN F CN E WH 1 CN 1 IC 1 CN J RY1 RY6 RY...

Page 41: ...5 RY6 D6 RY1 D1 R2 1 5k ZD2 HZ20 1 RY4 D4 RY3 D3 RY2 D2 10G471K C3 C2 1000µ 35v C5 10µ 35v C4 10µ 35v R5 3 3k SP1 VC BUZZER VR INT POWER CONTROL STOP SWITCH NC BOTTOM HEATING ELEMENT GRILL HEATING ELEMENT HIGH VOLTAGE TRANSFORMER STOP SWITCH OVEN LAMP TURNTABLE MOTOR DOOR OPEN CONTACT A 1 A 3 A 5 C 3 A 7 N O N O N O N O COM COM COM COM B 2 B 1 NOTE 1 NOTE 2 WH1 7 CONVECTION MOTOR RY7 D7 A 9 IF NOT...

Page 42: ...k ZD10 UDZ4 3B J18 J21 4 7k J20 4 7k J19 J13 4 7k J10 J14 4 7k J15 4 7k J11 J12 R10 1k R12 15k R13 15k R14 15k R11 4 7k D 13 D 12 D 14 D 11 D 7 D 9 SEG10 C1 1 5 10 15 20 25 30 51 55 60 65 70 75 80 31 35 40 45 50 81 85 90 95 VL1 AN7 AN6 AN5 AN4 AN3 AN2 AN1 AN0 P57 P56 P55 P54 P53 P52 P51 P50 P47 P46 P45 P44 TOUT INT2 P41 P40 P77 P76 P75 P74 SEG11 SEG12 SEG13 SEG14 SEG15 SEG39 SEG38 SEG37 SEG36 SEG3...

Page 43: ...2 1 1 CN B CN A CN E D12 1 7 J1 D13 CN C RY6 RY7 OL TTM CH BH FM CF 9 1 TH 2 3 R6 D1 D3 MICRO 1 R4 R3 D7 D6 VRS1 R5 SP1 R2 JP2 J2 JP3 JP4 JP1 RY2 RY1 RY3 RY4 RY5 POWER CONT D4 D5 15 C5 C4 C3 C1 D11 D14 C2 B B E E Q3 Q2 D2 PRINTED WIRING BOARD OF POWER UNIT DIAGRAM ...

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