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Bedienungsanleitung Sharp MMD24B

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  • Sharp MMD24B - page 1

    1 MMD24S MMD24B S38M289MMD24S MMD24S MICR O W A VE DRA WER MODELS SER VICE MANU AL MMD24B In the interest of user-safety the unit should be restored to its original condition and only par ts identical to those specified should be used. W ARNING T O SER VICE PERSONNEL: This service manual is intended for use b y persons having electrical and mec ha ...

  • Sharp MMD24B - page 2

    2 MMD24S MMD24B PRECA UTIONS T O BE OBSER VED BEFORE AND DUR - ING SER VICING T O A V OID POSSIBLE EXPOSURE T O EXCESSIVE MICR O W A VE ENERGY (a) Do not operate or allo w the oven to be oper ated with the door open. (b) Make the f ollowing safety checks on all ovens to be ser viced bef ore activating the magnetron or other microwa ve source, and m ...

  • Sharp MMD24B - page 3

    3 MMD24S MMD24B W ARNING T O SER VICE PERSONNEL Microw av e Oven units contain circuitry capable of producing v er y high v oltage and current, contact with f ollowing par ts ma y result in a sev ere, possib ly fatal, electrical shoc k. (Example) High V oltage Capacitor , High V oltage P ower T ransf or mer , Magnetron, High V oltage Rectifier Ass ...

  • Sharp MMD24B - page 4

    4 MMD24S MMD24B MICR O W A VE MEASUREMENT PROCEDURE A. Requirements: 1) Microwa ve leakage limit (P ower density limit): The power density of microw av e radiation emitted by a microw av e ov en should not e xceed 1mW/cm 2 at any point 5cm or more from the e xter nal surface of the o ven, measured prior to acquisition b y a purchaser , and thereaft ...

  • Sharp MMD24B - page 5

    5 MMD24S MMD24B PRODUCT DESCRIPTION SCHEMA TICS TEST PROCEDURE T OUCH CONTROL P ANEL MICRO W A VE DRA WER DISSASSEMBL Y AND ADJUSTMENT PROCEDURE WIRING DIA GRAM P AR TS LIST SER VICE MANU AL MICRO W A VE DRA WER MMD24S / MMD24B FOREWORD This Ma nual has been prepare d to pro vide Dacor S er vice P erson nel wit h Op era tion and Servi ce I nf ormat ...

  • Sharp MMD24B - page 6

    6 MMD24S MMD24B ITEM DESCRIPTION P ow er Requirements Canada - 117 V olts / 13.0 Amperes / 1500 Kw / 60 Hz (CUL) U .S.A. - 120 V olts / 13.6 Amperes / 1500 Kw / 60 Hz (UL) Single phase, 3 wire g rounded P ow er Output 950 watts (IEC TEST PR OCEDURE) Operating frequency of 2450MHz Cooking Cavity Dimensions Width 17-11/32 Height 5-7/8" 1.0 Cubic ...

  • Sharp MMD24B - page 7

    7 MMD24S MMD24B GENERAL INFORMA TION GROUNDING INSTR UCTIONS This ov en is equipped with a three prong g rounding 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 ordinances. In the ev ent of an electrical shor t circuit, grounding reduces the ...

  • Sharp MMD24B - page 8

    8 MMD24S MMD24B OPERA TION DESCRIPTION OF OPERA TING SEQUENCE The f ollowing is a descr iption of component functions dur- ing ov en operation. OFF CONDITION Closing the drawer activates the door sensing switch and secondar y interlock switch. (In this condition, the monitor s witch contacts are opened.) When ov en is plugged in, 120 volts A.C . is ...

  • Sharp MMD24B - page 9

    9 MMD24S MMD24B SENSOR COOKING CONDITION Using the SENSOR function, food is cook ed without figur- ing time, power lev el or quantity . When the ov en senses enough steam from the food, it rela ys the inf or mation to its microprocessor which will calculate the remaining cooking time and power lev el needed for best results. When the food is cooke ...

  • Sharp MMD24B - page 10

    10 MMD24S MMD24B SCHEMA TIC (OFF CONDITION) 3. Only certain models use the absol ute humidity sensor . 2. T erminal that is located on the right side on lamp socket's back view 1. Circuits / Wire Colors subject to change without notice. NOTES: must be connected to neutral wire. (DOOR CLOSED, COOK OFF CONDITTION) 4. Power T ransformer (Finish L ...

  • Sharp MMD24B - page 11

    11 MMD24S MMD24B TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST unlike conv entional microwa ve ovens , proper maintenance cannot be performed with only a voltmeter and ohmmeter . In this ser vice manual, the touch control panel assemb ly is divided into three units, Control Unit, K eyboard Unit and P ower Unit, and troubleshooting by unit replace ...

  • Sharp MMD24B - page 12

    12 MMD24S MMD24B C RELA Y TEST 4) Reconnect all leads remov ed from components dur ing testing. 5) Re-install the cov ers. 6) Reconnect the power supply cord after the co vers are installed. 7) Run the ov en and check all functions. TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST B KEY UNIT TEST 1. Disconnect the po wer supply cord, and then remov ...

  • Sharp MMD24B - page 13

    13 MMD24S MMD24B W ARNING : The ov en should be fully assembled bef ore f ollowing procedure. (1) Place one cup of w ater in the center of the tray in the o ven ca vity . (2) Close the dra wer , touch the Defrost pad. Then select Steaks/Chops by touching the number pad 2. And touch the number pad 5. (Now , w eight 0.5lb is set.) And then touch the ...

  • Sharp MMD24B - page 14

    14 MMD24S MMD24B W ARNING : The o ven should be fully assemb led before f ollowing procedure. (1) The ov en should be plugged in at least two minutes bef ore sensor cooking. (2) Room temperature should not e xceed 95 ο F (35 ο C). (3) The unit should not be installed in an y area where heat and steam are generated. The unit should not be installe ...

  • Sharp MMD24B - page 15

    15 MMD24S MMD24B TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 9-2. Place the container on the center of tray in the o ven cavity . 9-3. Close the drawer . 9-4. T ouch the TIMER/CLOCK pad once, the PO WER LEVEL pad twice and the ST AR T pad once . And touch the number pads 1 once and the number pad 4 once . 9-5. The control panel is in automatic ...

  • Sharp MMD24B - page 16

    16 MMD24S MMD24B 2. Open the dra wer and keep it open. 3. T o discharge high voltage capacitor , w ait for 60 seconds . 4. T o test f or an open filament, isolate the magnetron from the high voltage circuit. A continuity check across the magnetron filament leads should indicate less than 1 ohm. 5. T o test for a shor ted magnetron, connect the oh ...

  • Sharp MMD24B - page 17

    17 MMD24S MMD24B I SECONDAR Y INTERLOCK SWITCH TEST ST OP SWITCH 1. Disconnect the pow er supply cord. 2. Open the dra wer and keep it open. 3. T o discharge high v oltage capacitor , wait for 60 seconds . 4. Isolate the s witch and connect the ohmmeter to the common (COM.) and nor mally open (NO) terminal of the s witch. The meter should indicate ...

  • Sharp MMD24B - page 18

    18 MMD24S MMD24B TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST M PO WER TRANSFORMER TEST 1. Disconnect the pow er supply cord. 2. Open the dra wer and bloc k it open. 3. Discharge high voltage capacitor . 4. Disconnect the primar y input ter minals and measure the resistance of the transformer with an ohmmeter . Check for continuity of the coils ...

  • Sharp MMD24B - page 19

    19 MMD24S MMD24B T OUCH CONTR OL P ANEL ASSEMBL Y OUTLINE OF T OUCH CONTROL P ANEL The touch control section consists of the f ollowing units. ( 1) K ey unit (2) Control Unit (3) P ower unit The pr incipal functions of these units and the signals com- municated among them are e xplained below . Ke y unit The k ey unit is composed of a matrix, signa ...

  • Sharp MMD24B - page 20

    20 MMD24S MMD24B 1 - 3 AN5- AN3 IN T erminal to change cooking input according to the Model. By using A/D con ver ter contained in the LSI, DC voltage in accordance with the Model in operation is applied to set up its cooking constant. 4 AN2 IN Input signal which inf orm the dra wer door is in the middle position betw een the opened position and th ...

  • Sharp MMD24B - page 21

    21 MMD24S MMD24B 27 COM0 OUT Common data signal. Connected to LCD signal C4. 28 VL3 IN Connected VC (+5V). 29 - 31 P27- P25 OUT T er minal not used. 32 SEG20 OUT Segment data signal. Connected to LCD segment S24. 33 P23 IN Signal coming from touc h key . When any one of J-4 line ke ys on ke y matr ix is touched, a corresponding signal from P10- P17 ...

  • Sharp MMD24B - page 22

    22 MMD24S MMD24B Pin No. Signal I/O Description 47 P05 OUT Magnetron high-v oltage circuit driving signal. T o tur n on and off the cook relay(R Y2). In 100% pow er operation, the signals holds “H” lev el during microw av e cooking and “L ” le vel while not cooking. In other cooking modes (90%, 80%, 70%, 60%, 50%, 40%, 30%, 20%, 10%, 0%) th ...

  • Sharp MMD24B - page 23

    23 MMD24S MMD24B (1) Structure of Humidity Sensor The humidity sensor includes two ther mistors as shown in the illustr ation. One thermistor is housed in the closed vessel filled with dr y air while another in the open vessel. Each senso r is provided with the protectiv e cov er made of metal mesh to be protected from the e xter nal airflow . (2 ...

  • Sharp MMD24B - page 24

    24 MMD24S MMD24B 1. Precautions for Handling Electr onic Components This unit uses CMOS LSI in the int egral par t of the circu its. When handling these par ts, the following precautions should be str ictly follow ed. CMOS LSI hav e extremely high impedance at its input and output ter minals. For this reason, it is easily influenced by the surroun ...

  • Sharp MMD24B - page 25

    25 MMD24S MMD24B PRECA UTIONS FOR USING LEAD-FREE SOLDER 1. Employing lead-free solder The "Main PWB" of this model employs lead-free solder . This is indicated by the "LF" symbol printed on the PWB and in the ser vice manual. The suffix letter indicates the alloy type of the solder . Example: Indicates lead-free solder of tin, ...

  • Sharp MMD24B - page 26

    26 MMD24S MMD24B ma y result in sev ere, possibly f atal, electric shock. (Example) High V oltage Capacitor , P ow er T ransf or mer , Magnetron, High V oltage Rectifier Assemb ly , High V oltage Har ness etc.. W ARNING: T o A void possib le exposure to micro wave energy , please f ollow the instructions below before operating the o ven. W ARNING ...

  • Sharp MMD24B - page 27

    27 MMD24S MMD24B Back cover Exhaust duct screws T op plate Right side panel Left side panel Air cover Cavity Fig. 1 1. Bef ore removing Micro wav e Dra wer , take measures to protect the Drawer louv er by either remo ving the louver or b y letting the louver ov er hang off flat protected surf ace (Fig 1) . 2. Open the Dr awer to access the 4 mount ...

  • Sharp MMD24B - page 28

    28 MMD24S MMD24B At this point, you will ha ve access to all par ts of the Micro wave Drawer . 7. T o remove the Control P anel F rame Assemb ly , remov e the 9 screws holding the C/P frame to the ca vity . (Fig 3) . With the C/P frame assemb ly now loose, y ou can unplug all wires. Fig. 3 PO WER CORD REPLA CEMENT 1. Un-hook the b lack and white A ...

  • Sharp MMD24B - page 29

    29 MMD24S MMD24B 2. Open the dra wer and keep it open. 3. T o discharge the high voltage capacitor , wait for 60 seconds. 4. Remov e the screw holding the latch hook to the ov en flange. 5. Remov e the latch hook from the ov en flange. 6. Disconnect the wire leads of each s witch. 7. Remov e each switch from the latch hook by pushing the one (1) ...

  • Sharp MMD24B - page 30

    30 MMD24S MMD24B 1. F ollow the Microwa ve Draw er disassembly as previously stated 2. Open the dra wer and keep it open. 3. T o discharge the high voltage capacitor , wait for 60 seconds. 4. Remo ve the both right and left side panels. 5. Remov e (2) Dra wer Suppor t Covers from Choke Cov er as shown in (Fig. D-1) . 6. Inser t a putty knif e (thic ...

  • Sharp MMD24B - page 31

    31 MMD24S MMD24B (Locate either the right or left switch angle) 1. F ollow the Microw ave Dr awer disassemb ly as previously stated 2. Open the dra wer and keep it open. 3. T o discharge the high v oltage capacitor , wait for 60 seconds . 4. T o remov e switch, remo ve scre w (1) holding switch to s witch angle (Fig. S-1) . 5. T o replace switch an ...

  • Sharp MMD24B - page 32

    32 MMD24S MMD24B 1. Disengage any po wer going to the unit. 2. Open the dra wer and keep it open. 3. Remov e the top cov er and r ight side cabinet. 4. Unhook wiring to Auto Dr awer Gear . 5. Remov e bottom screw belo w Auto Dra wer Gear (Fig. G-1) . 6. Remov e the (4) screws holding the auto dra wer gear to the bottom cavity angle (Fig. G-2) . 7. ...

  • Sharp MMD24B - page 33

    33 MMD24S MMD24B 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 HIGH VOL T AGE RECTIFIER HIGH V OL T AGE CAP ACIT OR HIGH V OL T AGE WIRE A HIGH VOL T AGE COMPONENTS POWER TRANSFORMER Po wer Supply cord 120V 60Hz 1 2 3 WHT GRN BLK OVEN THERMAL CUT -OUT COOLING F AN MOT OR STIRRER MOT OR BLU OVEN LAMP ORG BRN BLK or YLW RED or BLK SECONDAR ...

  • Sharp MMD24B - page 34

    34 MMD24S MMD24B 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 Figure S-2. P ower Unit Circuit PA154DR VRS1 60Hz FUSE 2.5A C1 C2 1000uF/50V D1 -- D4 1N4002L x4 CN-A + D5 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 ...

  • Sharp MMD24B - page 35

    35 MMD24S MMD24B 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 Figure S-3. Control Unit Cir cuit S21 S20 S19 S18 S17 S16 S15 S14 S13 S12 S11 S10 S9 S8 S7 S6 S5 S4 S3 S2 S1 S0 C2 C1 C0 P36 P35 P34 P33 P32 COM0 COM1 COM2 COM3 VL3 SEG23 SEG22 SEG21 SEG20 SEG4 SEG5 SEG19 SEG18 SEG17 SEG16 SEG15 SEG14 SEG13 SEG12 SEG11 SEG10 SEG9 SEG7 SEG8 SEG ...

  • Sharp MMD24B - page 36

    36 MMD24S MMD24B 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 Figure S-4. Printed Wiring Board of P ower Unit 2.5A 3 1 2 FUSE T1 4 8 D3 ZD 1 J1 0 RY1 D1 2 R Y5 DIP CN H Q1 R 1 D2 D1 1 1 1 D4 1 1 R1 0 C10 R Y2 1 3 P 3 D1 1 D10 7 CN A CNB C1 1 R1 1 R Y4 R Y3 CO M. CO M. N.O. N.O. C1 C2 R3 J1 1 D7 D5 VR S1 ...

  • Sharp MMD24B - page 37

    37 MMD24S MMD24B 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 Figure S-5. Printed Wiring Board of Control Unit 7 8 7 8 6 5 6 Q7 LCD CNE CNN R40 CF1 1 1 5 3 B C E 5 1 3 4 3 4 2 1 2 R6 R5 D2 K Q3 O C I C Q2 B K C3 C21 C4 R22 C20 C2 C7 C11 C12 R13 C9 R17 C8 K ZD4 R11 R34 R14 R18 R46 R101 R100 R115 R107 R103 R102 R21 R106 R105 R104 C103 R114 ...

  • Sharp MMD24B - page 38

    44 MMD24S MMD24B COPYRIGHT © 2008 BY D ACOR, INC . ALL RIGHTS RESER VED . No part of this pub lica tion ma y be repr oduc ed, stored in retriev al systems, or transmitted in any form or by any means , electronic, mechanical, photocopying, recording, or otherwise, without pr ior wr itten per mission of the publisher . ...

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