Mmd24s mmd24b s38m289mmd24s mmd24s microwave drawer models service manual mmd24b in the interest of user-safety the unit should be restored to its original condition and only parts identical to those specified should be used. Warning to service personnel: this service manual is intended for use by p...
2 mmd24s mmd24b precautions to be observed before and dur- ing servicing to avoid possible exposure to excessive microwave energy (a) do not operate or allow the oven to be operated with the door open. (b) make the following safety checks on all ovens to be serviced before activating the magnetron o...
3 mmd24s mmd24b warning to service personnel microwave oven units contain circuitry capable of producing very high voltage and current, contact with following parts may result in a severe, possibly fatal, electrical shock. (example) high voltage capacitor, high voltage power transformer, magnetron, ...
4 mmd24s mmd24b microwave measurement procedure a. Requirements: ) microwave leakage limit (power density limit): the power density of microwave radiation emitted by a microwave oven should not exceed mw/cm 2 at any point 5cm or more from the external surface of the oven, measured prior to acquisiti...
5 mmd24s mmd24b product description schematics test procedure touch control panel microwave drawer dissassembly and adjustment procedure wiring diagram parts list service manual microwave drawer mmd24s / mmd24b foreword this manual has been prepared to provide dacor service personnel with operation ...
6 mmd24s mmd24b item description power requirements canada - 7 volts / 3.0 amperes / 500 kw / 60 hz (cul) u.S.A. - 20 volts / 3.6 amperes / 500 kw / 60 hz (ul) single phase, 3 wire grounded power output 950 watts (iec test procedure) operating frequency of 2450mhz cooking cavity dimensions width 7-/...
7 mmd24s mmd24b 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 ordinances. In the event of an ele...
8 mmd24s mmd24b operation description of operating sequence the following is a description of component functions dur- ing oven operation. Off condition closing the drawer activates the door sensing switch and secondary interlock switch. (in this condition, the monitor switch contacts are opened.) w...
9 mmd24s mmd24b sensor cooking condition using the sensor function, food is cooked without figur- ing time, power level or quantity. When the oven senses enough steam from the food, it relays the information to its microprocessor which will calculate the remaining cooking time and power level needed...
0 mmd24s mmd24b schematic (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 ...
Mmd24s mmd24b test procedures procedure letter component test unlike conventional microwave ovens, proper maintenance cannot be performed with only a voltmeter and ohmmeter. In this service manual, the touch control panel assembly is divided into three units, control unit, keyboard unit and power un...
2 mmd24s mmd24b c relay test 4) reconnect all leads removed from components during testing. 5) re-install the covers. 6) reconnect the power supply cord after the covers are installed. 7) run the oven and check all functions. Test procedures procedure letter component test b key unit test . Disconne...
3 mmd24s mmd24b warning : the oven should be fully assembled before following procedure. () place one cup of water in the center of the tray in the oven cavity. (2) close the drawer, touch the defrost pad. Then select steaks/chops by touching the number pad 2. And touch the number pad 5. (now, weigh...
4 mmd24s mmd24b warning : the oven should be fully assembled before following procedure. () the oven should be plugged in at least two minutes before sensor cooking. (2) room temperature should not exceed 95 ο f (35 ο c). (3) the unit should not be installed in any area where heat and steam are gene...
5 mmd24s mmd24b test procedures procedure letter component test 9-2. Place the container on the center of tray in the oven cavity. 9-3. Close the drawer. 9-4. Touch the timer/clock pad once, the power level pad twice and the start pad once. And touch the number pads once and the number pad 4 once. 9...
6 mmd24s mmd24b 2. Open the drawer and keep it open. 3. To discharge high voltage capacitor, wait for 60 seconds. 4. To test for an open filament, isolate the magnetron from the high voltage circuit. A continuity check across the magnetron filament leads should indicate less than ohm. 5. To test for...
7 mmd24s mmd24b i secondary interlock switch test stop switch . Disconnect the power supply cord. 2. Open the drawer and keep it open. 3. To discharge high voltage capacitor, wait for 60 seconds. 4. Isolate the switch and connect the ohmmeter to the common (com.) and normally open (no) terminal of t...
8 mmd24s mmd24b test procedures procedure letter component test m power transformer test . Disconnect the power supply cord. 2. Open the drawer and block it open. 3. Discharge high voltage capacitor. 4. Disconnect the primary input terminals and measure the resistance of the transformer with an ohmm...
9 mmd24s mmd24b touch control panel assembly outline of touch control panel the touch control section consists of the following units. () key unit (2) control unit (3) power unit the principal functions of these units and the signals com- municated among them are explained below. Key unit the key un...
20 mmd24s mmd24b - 3 an5- an3 in terminal to change cooking input according to the model. By using a/d converter 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 inform the drawer door is in the middle p...
2 mmd24s mmd24b 27 com0 out common data signal. Connected to lcd signal c4. 28 vl3 in connected vc (+5v). 29 - 3 p27- p25 out terminal not used. 32 seg20 out segment data signal. Connected to lcd segment s24. 33 p23 in signal coming from touch key. When any one of j-4 line keys on key matrix is touc...
22 mmd24s mmd24b pin no. Signal i/o description 47 p05 out magnetron high-voltage circuit driving signal. To turn on and off the cook relay(ry2). In 00% power operation, the signals holds “h” level during microwave cooking and “l” level while not cooking. In other cooking modes (90%, 80%, 70%, 60%, ...
23 mmd24s mmd24b (1) structure of humidity sensor the humidity sensor includes two thermistors as shown in the illustration. One thermistor is housed in the closed vessel filled with dry air while another in the open vessel. Each sensor is provided with the protective cover made of metal mesh to be ...
24 mmd24s mmd24b 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...
25 mmd24s mmd24b precautions 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 service manual. The suffix letter indicates the alloy type of the solder. Example: indicates...
26 mmd24s mmd24b may result in severe, possibly fatal, electric shock. (example) high voltage capacitor, power transformer, magnetron, high voltage rectifier assembly, high voltage harness etc.. Warning: to avoid possible exposure to microwave energy, please follow the instructions below before oper...
27 mmd24s mmd24b back cover exhaust duct screws top plate right side panel left side panel air cover cavity fig. 1 . Before removing microwave drawer, take measures to protect the drawer louver by either removing the louver or by letting the louver over hang off flat protected surface (fig 1). 2. Op...
28 mmd24s mmd24b at this point, you will have access to all parts of the microwave drawer. 7. To remove the control panel frame assembly, remove the 9 screws holding the c/p frame to the cavity. (fig 3). With the c/p frame assembly now loose, you can unplug all wires. Fig. 3 power cord replacement ....
29 mmd24s mmd24b 2. Open the drawer and keep it open. 3. To discharge the high voltage capacitor, wait for 60 seconds. 4. Remove the screw holding the latch hook to the oven flange. 5. Remove the latch hook from the oven flange. 6. Disconnect the wire leads of each switch. 7. Remove each switch from...
30 mmd24s mmd24b . 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 both right and left side panels. 5. Remove (2) drawer support covers from choke cover as shown in (fig. ...
3 mmd24s mmd24b (locate either the right or left switch angle) . 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. To remove switch, remove screw () holding switch to switch angle (fig...
32 mmd24s mmd24b . Disengage any power going to the unit. 2. Open the drawer and keep it open. 3. Remove the top cover and right side cabinet. 4. Unhook wiring to auto drawer gear. 5. Remove bottom screw below auto drawer gear (fig. G-1). 6. Remove the (4) screws holding the auto drawer gear to the ...
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 voltage rectifier high voltage capacitor high voltage wire a high voltage components power transformer power supply cord 120v 60hz 1 2 3 wht grn blk oven thermal cut-out cooling fan motor stirrer motor blu oven lamp org br...
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. Power unit circuit pa154dr vrs1 60hz fuse 2.5a c 1 c 2 10 00 uf /5 0v d1 -- d4 1n4002l x4 cn-a + d 5 ry2 com n.O. D 7 ry1 com n.O. D 10 ry3 d 11 ry4 d 12 ry5 h-1 h-3 h-2 h-4 h-5 h-7 h-6 ac 120v micro com (o.L) fm sm...
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. Contr ol unit cir cuit s2 1 s2 0 s1 9 s1 8 s1 7 s1 6 s1 5 s1 4 s1 3 s1 2 s1 1 s1 0 s9 s8 s7 s6 s5 s4 s3 s2 s1 s0 c2 c1 c0 p 3 6 p 3 5 p 3 4 p 3 3 p 3 2 c o m 0 c o m 1 c o m 2 c o m 3 v l 3 s e g 2 3 s e g 2 2 s e g...
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 power unit 2.5a 3 1 2 fuse t1 4 8 d 3 zd 1 j1 0 r y1 d 12 r y5 d ip c n h q 1 r 1 d 2 d 1 1 11 d 4 1 1 r 10 c 10 r y 2 1 3 p 3 d 11 d 10 7 c n a c n b c11 r11 ry4 ry3 com. Com. N.O. N.O. C1 c...
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 boar d of contr ol 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 r...
44 mmd24s mmd24b copyright © 2008 by dacor, inc. 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 publish...
