Wolf MWD24-2 Service Manual Download Page 68

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Drawer Microwave

(Models MWD24-2 / MWD30-2)

Wiring Diagrams

6-4

#813632 - Revision B - December, 2009

<CONTROL

UNIT>

OP/

CLEAR

REHEA

MINUTE PLUS

SENSOR COOK

SENSOR REHEA

DEFROST

OPEN

SENSOR POPCORN

KEEP WA

TIMER CLOCK

POWER LEVEL

SET

CUST

M HELP

CONTROL

LOCK ON/OFF

15K

P17

P16

P15

P14

P13

P12

P10

R100

R101

R102

R103

R104

R105

R106

R107

J-1

J-2

J-3

J-4

J-5

J-6

J-7

J-8

J-9

J-12

J-1

J-10

<KEY

UNIT>

-J

P60

TXout

P36

P34

15K

270K

50V 330p

P23

P20

P21

P22

R108

R109

R112

R113

R114

R115

C100

C101

C102

C103

4
3
2
1

VSS

A2
A1
A0

5
6
7
8

SDA
SCL

TEST

VCC

(R38)

(R37)

(R35)

(C30)

P62

P61

(R36)

(IC-6)

P36

TXout

P34

RXD2

TXD2

COM0 COM1 COM2 COM3

VL3

P27

P26

P25

SEG20

SCLK2

P30

P04

P05

P23

P22

P21

P20

P17

P16

P15

P14

P13

P12

P11

P07

P10

P06

IC-1

AN0

CNVSS

RESET

P62

P61

XIN

XOUT

P60

VSS

VCC

P37

P03 P02 P01 P00 P57 P56 TXD1

P52 P51

RXD1 P53

AVSS

INT0

VREF AN7 AN6

AN5

AN4

AN3

AN2

AN1

R17

4.7K

R18

C13

AN5

CF1 4MHz

AN4

Q24

KRC101S

Flash:10K

Mask:0

AN3

(J2)

(J4)

(J6)

4.7K

0.01u/50V

+ -

C44

C45

D41

R50

R51

10K

47K

R45

R46

R48

R47

R49

P01

P02

P03

P04

P00

47K

R52

0.01u/50V

AN1

P05

P51

P57

R68

3.3K

4.7K

AN2

R23

C23

D95

K-5

4.7K

R56

C52

M-5

4.7K10K

10K

R58

C51

R55

R57

Q22

Q21

C20

C21

R69

1.5K

KRA224S

10uF/35V

KRC101S

N-1

N-2

N-5

N-4

N-3

+24V

GND

PWM

CW/CCW

SLIDE M

4.7K

R98

R99

R97

R95

R96

100

Q95

Q96

Q97

KRA102S

KRC101S

CN-N

C90

D96

D97

K-7

K-8

E-3

SM (R

Y3)

FM (R

Y4)

+24V

10K

35V

10uF

SW Reg.

PWR (R

Y5)

Q23

Q26

Q25

KRC101S

P06

P07

270

DOOR

POS. SW

REAR

R22

R24

4.7K

E-1

GND

CN-E

C43

C42

C41

C40

R40

R42

R44

R43

R41

1.8KF

360KF

3.57KD

3.32KD

IC-5

F-2

F-3

430

KIA358

D40

620K

300K

150KF

75KF

37.4KF

ZD2

HZU16B2

C11

R14

4.7K

ZD4

HZU3.6B2

R11

4.7K

C10

R15

D22

D21

R16

LD1

LD2

LD3

4.7K

AH SENSOR

CN-F

K-2

K-1

K-3

F-1

M-1

D19

D20

Q20

4.7K

R13

4.7K

R12

10uF/35V

GND

INT

10uF/35V

KIA78L05BP

10uF/35V

KRA1

17S

200 1w x2

C12

CN-K

M-2

CN-M

KTC1027

K-4

KRC101S

KTC3875

390

4.7K

R34

50V

0.01u

M-7

M-6

K-6

10K

4.7K

M-3

POS. SW3.

DOOR

POS. SW

DOOR

FRONT

MICRO

Y2)

(CLOSE)

DOOR SW

COM

(O.L./MICRO)

Y1)

R20

R21

(C22)

M-4

R26

R27

R28

R29

4.7K

S24

COM0

SEG20

COM1

SCLK TXD RXD

BUSY

VCC

RESET VP

CE VSS

P30 (23Pin) P31 (22Pin) P32 (21Pin) P33 (20Pin) RESET

(8Pin)

CNVSS (7Pin) AN1 (5Pin) VSS

CN-X

(IC-1)

S21

S22

S23

SEG0

SEG1

SEG2

SEG4

SEG5

SEG19

SEG18

SEG17

SEG16

SEG15

SEG14

SEG13

SEG12

SEG11

SEG10

SEG9

SEG7

SEG8

SEG6

IC-2

AN0

CNVSS

RESET

P62

P61

XIN

XOUT

P60

VSS

VCC

P37

SEG3 SEG2 SEG1 SEG0 P57 SCLK1 TXD1

P52 P51

RXD1 P53

AVSS

INT0

VREF AN7 AN6

AN5

AN4

AN3

AN2

AN1

R33

R30

R31

R32

4.7K

CF2

4MHz

C15

P36

P35

P34

P33

P32

COM0 COM1 COM2 COM3

VL3

SEG23

SEG22

SEG21

SEG20

P31

P30

S20

S19

S18

S17

S16

S15

S14

S13

S12

S11

S10

SEG3

SEG4

SEG5

SEG6

SEG7

SEG8

SEG9

SEG10

SEG11

SEG12

SEG13

SEG14

SEG15

SEG16

SEG17

SEG18

SEG19

SEG20

SEG21

COM0

COM1

COM3

SEG22

SEG23

COM2

LCD

RLCDSA137DRZZ

DRAWER MICROWAVE CONTROL UNIT CIRCUIT

Summary of Contents for MWD24-2

Page 2: ......

Page 3: ...General Information Drawer Microwave Models MWD24 2 MWD30 2 1 1 813632 Revision B December 2009 SECTION 1 GENERAL INFORMATION ...

Page 4: ...FETY INFORMATION Below are Product Safety Labels used in this manual The Signal Words used are WARNING or CAUTION When reviewing this manual please note these different Product Safety Labels placed at the beginning of certain sections of this manual You must follow the instructions given in the boxes of the Product Safety Labels in order to avoid personal injury and or product damage The sample Pr...

Page 5: ...13 Humidity Sensor Circuit 3 14 Touch Panel Function 3 15 Description of LSI 3 16 Section 4 Component Access and Removal Warnings and Cautions 4 2 Precautions For Using Lead Free Solder 4 3 Microwave Measurement Procedure 4 4 Touch Control Panel Servicing 4 5 Drawer Microwave Disassembly 4 6 Upper Cabinet Component Replacement 4 7 Cavity Light Replacement 4 7 Power Cord Replacement 4 7 Switch Stop...

Page 6: ...PRODUCT warranty parts and labor NOTE This warranty only applies to products installed in test kitchens culinary and school kitchens and other installations which help promote Wolf Appliance products Restaurant installations and other similar commercial applications carry no warranty WARRANTY NOTES All warranties begin at the time of the unit s initial installation All Warranty and Service informa...

Page 7: ...e display 99 minutes 99 seconds Oven drawer with window Control lock Oven light comes on when oven is operating or drawer is open Tight drawer seals with automatic drawer open close Menu List Touch Control Panel Sealing Surfaces Drawer Guides Louver Vent Light Underneath control panel Waveguide Cover DO NOT REMOVE Figure 1 3 Drawer Microwave Features Figure 1 4 Touch Control Panel Layout V I S U A...

Page 8: ...ecommend that the cleaner be applied to a soft cloth and then carefully used on the stainless exterior rather than sprayed directly on to it Follow package directions carefully Front Side of Drawer Wipe the window on both sides with a soft damp cloth to remove any spills or spatters Metal parts will be easier to maintain if wiped frequently with a soft damp cloth Avoid the use of spray and other h...

Page 9: ...Installation Information Drawer Microwave Models MWD24 2 MWD30 2 2 1 813632 Revision B December 2009 SECTION 2 INSTALLATION INFORMATION ...

Page 10: ...ER MICROWAVE IS IN USE NEVER LEAVE DRAWER OPEN WHEN MICROWAVE IS UNATTENDED DO NOT USE DRAWER MICROWAVE AS A STORAGE SPACE THIS CREATES A POTENTIALLY HAZ ARDOUS SITUATION CHECK THAT THE TIME OF DAY IS IN THE DISPLAY IF NOT TOUCH STOP CLEAR TO PREVENT UNINTENDED USE THIS DRAWER MICROWAVE MUST BE ELECTRICALLY GROUNDED IN ACCORDANCE WITH LOCAL CODES DO NOT USE AN EXTENSION CORD IF POWER SUPPLY CORD I...

Page 11: ... Check location where the drawer microwave will be installed for proper electrical supply Your oven can be built into a cabinet or wall by itself or under a gas or electric wall oven Be sure that the clearance of the floor between the wall oven and the drawer microwave is a minimum of 2 51mm The microwave interior will easily accommodate a 9 229mm x 13 330mm oblong dish or a bag of microwave popco...

Page 12: ...rlap B 23 1 2 597 Depth Min C Allow 3 4 19 Overlap D 4 102 E 5 127 F Allow 7 16 11 Overlap G 14 13 16 376 Opening H Allow 3 16 5 Overlap 30 762 Cabinet Min 28 7 16 722 Opening A B C D E F 3 1 16 78 14 13 16 376 to bottom of anti tip block G H Figure 2 5 30 Drawer Microwave Install Specifications Figure 2 6 Drawer Microwave Installation MWD24 shown 6 152 19 483 to top of floor recommended 36 914 Co...

Page 13: ...Theory of Operation Drawer Microwave Models MWD24 2 MWD30 2 3 1 813632 Revision B December 2009 SECTION 3 THEORY OF OPERATION ...

Page 14: ...hese steps 1 Plug in drawer microwave will appear in the display See Figure 3 1 2 Touch the STOP CLEAR pad See Figure 3 1 will appear in the display 3 Set clock proceed to steps below to set timer press 1 to set clock press 2 TO SET THE CLOCK See Figure 3 2 1 Touch TIMER CLOCK pad will appear in the display Press the number two 2 2 Touch number pads for correct time of day then touch TIMER CLOCK p...

Page 15: ...top the drawer microwave temporarily during timed cooking Return the time of day to the display Cancel a program during cooking touch twice for timed cooking Figure 3 4 STOP CLEAR Pad Feature Figure 3 5 Opening and Closing The Drawer Microwave Figure 3 6 Time Cooking TIME COOKING See Figure 3 6 Your drawer microwave can be programmed for 99 minutes and 99 seconds 99 99 Always enter the seconds aft...

Page 16: ...or paper towel The sensor works with foods at normal storage temperature For example popcorn would be at room temp Any SENSOR selection can be programmed with More or Less Time Adjustment See page 3 8 More or less food than the quantity listed in the Sensor Cooking Guide should be cooked following the guidelines in any microwave cookbook During the first part of sensor use the food name will appea...

Page 17: ...ture Touch SENSOR POPCORN or SENSOR REHEAT pad then START ADD MINUTE pad Touch SENSOR COOK pad touch number pad to select food then START ADD MINUTE pad see label select food number BAKED pota toes regular touch start touch again for mini sensor reheat popcorn regular sensor cook sensor reheat touch start SENSOR POPCORN AND SENSOR REHEAT FEATURE See Figure 3 10 You can pop popcorn and reheat many ...

Page 18: ... and Care Manual page 22 1 Touch REHEAT pad once will appear in the display Select desired food by touching number pad See Menu Label Example Touch 2 for frozen rolls or muffins 2 Touch the number pad again to select the quantity For example Touch 2 for 2 rolls or muffins 3 Touch START ADD MINUTE pad NOTES Reheat can be programmed with More or Less Time Adjustment See page 3 8 of this section see ...

Page 19: ... To enter 30 minutes touch 3 0 0 0 will appear in the display 3 Touch START ADD MINUTE pad The oven will start The display will show and count down will be displayed intermittently during the countdown keep warm MANUAL COOKING See Figure 3 15 1 Enter desired cooking time and power level 2 Touch MICRO WARM pad Enter desired warming time up to 30 minutes 4 Touch START ADD MINUTE pad The operation wi...

Page 20: ...sequences switching from one power level setting to another automatically Sometimes cooking directions tell you to start on one power level and then change to a different power level Your drawer microwave can do this automatically 1 First enter cooking time Then touch POWER LEVEL pad once for 100 cooking or repeat touching POWER LEVEL pad for a lower power level 2 Enter second cooking time Repeat ...

Page 21: ...e again touch START ADD MINUTE pad within 3 minutes after cooking after closing the drawer or after touching the STOP CLEAR pad The START ADD MINUTE feature cannot be used with SENSOR settings REHEAT or DEFROST features lock on lock off more touch start CONTROL LOCK ON OFF FEATURE See Figure 3 20 The CONTROL LOCK ON OFF feature prevents unwanted drawer operation such as by small children The drawe...

Page 22: ...play shows To restore sound 1 Touch SETUP HELP pad The display shows 2 Touch SETUP HELP pad again The display shows 3 Touch START ADD MINUTE pad The display shows Figure 3 22 End of Cooking Reminder On or Off Touch SETUP HELP pad three times then touch START ADD MINUTE pad remind signal off touch start remind signal off remind signal on touch start remind signal on END OF COOKING REMINDER See Figu...

Page 23: ...five 5 times The display shows 2 Hold START ADD MINUTE pad for three 3 seconds The display shows NOTES The drawer microwave doesn t heat in Demo Mode The Display counts down quickly auto start 4 30 on AUTO START See Figure 3 23 If you wish to program the drawer microwave to begin cooking automatically at a designated time of day 1 Touch SETUP HELP pad 4 times The display shows 2 Touch START ADD MI...

Page 24: ...nent functions during oven operation Off Condition Closing the drawer activates the door sensing switch and secondary interlock switch In this condi tion the monitor switch contacts are opened When the oven is plugged in 20 vac is supplied to the control unit See Figure 3 26 Off Schematic Condition diagram The display will show flashing To set any pro gram or set the clock you must first touch the...

Page 25: ...energized the oven lamp remains on 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 it will function in the following sequence 8 When the drawer opens from the closed posi...

Page 26: ... 86 seconds the cook relay RY 2 is energized The power transformer is turned on microwave energy is produced and first stage is started The 3 86 seconds is the cooling time required to remove any vapor from the oven cavity and sensor NOTE During this first stage do not open the drawer or touch the STOP CLEAR pad 4 When the sensor detects the vapor emitted from the food the display switches over to...

Page 27: ... WHITE GREEN 2 M4 GREEN GRAY M5 BLUE GREEN MONITOR SWITCH N O COM POWER TRANSFORMER MAGNETRON H V RECTIFIER CAPACITOR xxx µF AC 2300V GRAY Door Closed Cook Off Condition MICROWAVE DRAWER RED THIRD DOOR SWITCH ORANGE or YELLOW BLACK or YELLOW RED or BLACK BROWN SECONDARY INTERLOCK SWITCH COM N C N O WHITE DOOR POSITION SWITCH REAR DOOR POSITION SWITCH FRONT DOOR SENSING SWITCH TO SOURCE TO LOAD TO ...

Page 28: ...5 in the LSI are turned on in such a way as to change the resistance values in parallel with R45 R49 Changing 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 6 sec onds after the unit is put in the Sensor Cook...

Page 29: ... which resets the LSI IC to the initial state when power is supplied 5 Indicator Circuit A circuit to drive the Liquid Crystal Displays LCD 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 IC...

Page 30: ...l not used Power Source Voltage 0V GND VS voltage of power source circuit input Connected GND Internal Clock Oscillation Frequency Setting Input The internal clock frequency is set by inserting the ceramic filter oscillation circuit with respect to Xout terminal Internal Clock Oscillation Frequency Control Output Output to control oscillation input of Xin Power Source Voltage 5V VC voltage of powe...

Page 31: ... matrix is touched Key Strobe Signal Signal applied to touch key section A pulse signal is input to P20 P23 terminal while one of J 11 line key on matrix is touched 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 Key Strobe Signal Signal applied to touch key section A pulse signal is input to P20 P23 ...

Page 32: ...Common Relay Driving Signal Square Waveform 60Hz To turn on and off the shut off relays RY1 The square waveform voltage is deliv ered to the relay RY1 driving circuit Terminal not used Terminal not used Terminal not used Terminal not used Signal I O Description Microwave Cooking Mode Other Cooking Mode Vari Mode On Time Off Time On Time Off Time 100 power 32 sec 0 sec 60 sec 0 sec 90 power 30 sec ...

Page 33: ...ce Frequency This is the basic timing for all real time processing of LSI A D Converter Power Source Voltage The power source voltage to drive the A D converter in the LSI Reference Voltage Input Terminal A reference voltage applied to the A D converter in the LSI Connected to 5V AH Sensor Input This input is an analog input terminal from the AH sensor circuit and connected to the A D converter bu...

Page 34: ...Drawer Microwave Models MWD24 2 MWD30 2 Theory of Operation 3 22 813632 Revision B December 2009 ...

Page 35: ...Component Access Drawer Microwave Models MWD24 2 MWD30 2 4 1 813632 Revision B December 2009 SECTION 4 COMPONENT ACCESS AND REMOVAL ...

Page 36: ...1 ON PAGE 4 3 TO AVOID ELECTRIC SHOCK POWER TO UNIT MUST BE DISCONNECTED WHENEVER ACCESSING AND OR REMOVING COMPONENTS POWERED BY ELECTRICITY OR COMPONENTS NEAR OTHER ELEC TRICAL COMPONENTS BEFORE WIRING 1 DISCONNECT POWER SUPPLY CORD OPEN DRAWER WAIT 60 SECONDS THEN DISCHARGE THE HIGH VOLTAGE CAPACITOR 2 DON T LET THE WIRE LEADS TOUCH TO THE FOLLOWING PARTS HIGH VOLTAGE PARTS MAGNETRON HIGH VOLTA...

Page 37: ...melting point of lead free solder is approximately 40 C higher than 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 ...

Page 38: ...t any leakage is meas ured accurately C Set the cooking control on Full Power Cooking Mode D Close the drawer and select a cook cycle of several minutes If the water begins to boil before the survey is completed replace it with 275 ml of cool water 3 Leakage test Closed drawer leakage test microwave measurement A Grasp the probe of the survey instrument and hold it perpendicular to the gap between...

Page 39: ...f the touch control panel Disconnect the power supply cord Open the door and block it open Re connect the leads to the primary of the power transformer Re install the outer case cabinet Re connect the power supply cord after the outer case is installed Run the oven and check all functions C On some models the power supply cord between the touch control panel and the oven itself is so short that th...

Page 40: ...ng and unplug the power supply cord Place the unit on a sturdy work surface 3 Extract four mounting screws two on each side from the left and right side angles to remove the lou ver vent from the unit See Figure 4 3 Place vent off to the side on a flat protected surface 4 Remove the top cover See Figure 4 3 5 Remove the air cover from the back of the unit both right and left side angles then both ...

Page 41: ...re 4 3 on page 4 6 NOTE Lamp and socket are an assembly You must change socket along with the lamp 3 Remove lamp socket screw to remove the lamp assembly and replace with new See Figure 4 6 Figure 4 6 Lamp Socket Removal Screw Figure 4 5 Upper Components Upper Cabinet Component Replacement Sensor Stirrer Motor Upper Thermal Limiter 1 Drawer Microwave must be removed from its instal lation See Draw...

Page 42: ...t be taken not to break the plastic stopper tab or the holding clips 8 Now each switch is free Re install 1 Re install each switch in its place The secondary interlock switch is in the lower position and the moni tor switch is in the top position located on the left side of the unit The door sensing switch is by itself on the right side of the unit 2 Re connect wire leads to each switch See Figure...

Page 43: ...itch has not activated fully you will need to adjust the slide rail attached to the microwave cavity 10 This is done by following the steps to remove the Drawer Assembly and Drawer Support Angle Removal on page 4 10 After you have removed the drawer support covers loosen the two screws holding the slide rail to the microwave cavity and tilt the front end up and the rear end down then tighten the s...

Page 44: ...rt angles as shown in Figure 4 11 9 Unhook the drawer support angles from the drawer then remove 10 Now the door assembly is free and the choke cover can now be removed Drawer Support Angle Removal 1 Remove the drawer assembly and choke cover first 2 Remove two mounting screws from the right or left latch angle assembly then remove angle assembly See Figure 4 12 3 Separate slide rails by moving in...

Page 45: ...e NOTE The drawer on a microwave oven is designed to act as an electronic seal preventing the leakage of microwave energy from oven cavity during cook cycle This function does not require that door be air tight moisture condensation tight or light tight Therefore occasional appearance of moisture light or sensing of gentle warm air movement around oven drawer is not abnormal and do not of themselv...

Page 46: ... Unhook wiring to auto drawer gear 5 Remove the bottom screw from below the auto draw er gear See Figure 4 15 6 Extract four 4 mounting screws holding the auto drawer gear to the bottom cavity angle See Figure 4 16 7 Disengage pull the auto drawer gear from rack gear and slide to the right toward the rear then turn motor 90 and slip out along the rear of the drawer 8 Then tilt auto gear motor 20 t...

Page 47: ...omponents 1 Drawer Microwave must be removed from its installation Remove the top plate both side cabinet panels the exhaust duct and the back plate 2 Only attempt to remove a major control component after allowing the capacitor to self discharge which takes approximately 60 seconds or discharge capacitor as instructed on page 4 3 3 All major control components are attached with phillips head scre...

Page 48: ...Drawer Microwave Models MWD24 2 MWD30 2 Component Removal 4 14 813632 Revision B December 2009 ...

Page 49: ...Troubleshooting Guide Drawer Microwave Models MWD24 2 MWD30 2 5 1 813632 Revision B December 2009 SECTION 5 TROUBLESHOOTING GUIDE ...

Page 50: ...he outer cabinet case removed See CAUTION above In this event 1 Disconnect the power supply cord and then remove outer cabinet case 2 Open the door and block it open 3 Discharge high voltage capacitor See WARNING above 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 Only after p...

Page 51: ...testing recommended instruments are NARDA 8100 and NARDA 8200 2 Place the load of 275 15 ml 9 8 oz of tap water initially at 20 5 C 68 F in the center of the oven cavity The water 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 non conductive material such as glass or plastic The placing of this standard load in the...

Page 52: ... The following symptoms indicate a defective keyboard unit When touching the pads a certain pad produces no signal at all When touching a number pad two figures or more are displayed When touching the pads sometimes a pad produces no signal If The Keyboard Unit is Defective 1 Disconnect the power supply cord and then remove covers 2 Open the drawer and block it open 3 Discharge high voltage capaci...

Page 53: ...ch stop switch operates properly that is the contacts are closed when the drawer is closed and open when the drawer is open If the door sensing switch stop switch is good disconnect the flat ribbon cable that connects the key unit to the control unit and make sure the drawer sensing switch is closed either close the drawer or short the door sensing switch connecter Use the Key unit matrix indicate...

Page 54: ...hese relays are operated by D C voltage Check voltage at the relay coil with a D C voltmeter during the microwave cooking operation DC voltage indicated Defective relay DC voltage not indicated Check diode which is connected to the relay coil If diode is good control unit is defective COMPONENT TEST PROCEDURE LETTER RELAY SYMBOL OPERATIONAL VOLTAGE CONNECTED COMPONENTS RY1 Approx 26 vdc Oven lamp ...

Page 55: ...n the oven cavity 2 Close the drawer touch the Defrost pad Then select Steaks Chops by touch ing the number pad 2 And touch the number pad 5 Now weight 0 5lb is set And then touch the start pad 3 The oven is in Defrost cooking condition 4 The oven will operate as follows WEIGHT 1ST STAGE 2ND STAGE 3RD STAGE LEVEL TIME LEVEL TIME LEVEL TIME 0 5 lb 60 20 sec 40 20 sec 30 45 sec 5 If improper operati...

Page 56: ...he troubleshooting guide given below if indicator does not light up after above check and repairs are finished Disconnect the power supply cord Remove the outer case cabinet Open the door and block it open Discharge high voltage capacitor Disconnect the leads to the primary of the power transformer Ensure that these leads remain isolated from other components and oven chassis by using insulation t...

Page 57: ...olvents near the oven while using Sensor settings The sensor will detect the vapor given of by the spray and turn off before food is properly cooked 8 If the sensor has not detected the vapor of the food ERROR will appear and the oven will shut off Water Load Cooking Test Make sure the oven has been plugged in at least two minutes before checking sensor cook operation The cabinet should be install...

Page 58: ...If new sensor does not operate properly the problem is with the control unit and refer to explanation be low CHECKING CONTROL UNIT 1 Disconnect the power supply cord and then disassemble as per Drawer Microwave Disassembly Section 4 Component Access Removal Page 4 6 2 Open the drawer and block it open 3 Discharge high voltage capacitor 4 Disconnect the sensor connector that is mounted to control p...

Page 59: ... Plunger NC NO COM COM NO NC R3 R4 R1 R2 1 2 3 F 1 F 2 F 3 To connector F on Control Unit CONNECTOR Refer to the Disassembly instructions found on page 16 G MAGNETRON ASSEMBLY TEST 1 Disconnect the power supply cord 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 cir cuit A conti...

Page 60: ...d the temperature of the water 2 Place the cup of water in the oven Operate oven at POWER 10 HIGH selecting more than 60 seconds cook time Allow the water to heat for 60 seconds measuring with a stop watch second hand of a watch or the 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 un...

Page 61: ...rd 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 nor mally open NO terminal of the switch The meter should indicate an open circuit with the drawer open and a closed circuit with the drawer closed If improper operation is indicated replace the secondary interlock switch 5 Reconnect al...

Page 62: ...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 plus fuse will need to be replaced...

Page 63: ...itor switch must be replaced with monitor fuse and monitor switch assembly See Section 5 even if the monitor switch operates normally The monitor fuse and monitor switch assembly is comprised of a 20 ampere fuse and switch 5 Reconnect all leads removed from components during testing 6 Reassemble the unit 7 Reconnect the power supply cord 8 Run the oven and check all functions M POWER TRANSFORMER T...

Page 64: ...Drawer Microwave Models MWD24 2 MWD30 2 Troubleshooting Guide 5 16 813632 Revision B December 2009 ...

Page 65: ...Wiring Diagrams Drawer Microwave Models MWD24 2 MWD30 2 6 1 813632 Revision B December 2009 SECTION 6 WIRING DIAGRAMS ...

Page 66: ...BLK THIRD DOOR SWITCH N C MAGNETRON THERMAL CUT OUT 1 2 3 4 5 6 7 GRY WHT 8 GRY GRY GRY GRY GRY GRY 1 2 3 BLK RED ORG 1 2 3 4 5 BLU BLK RED YLW 1 2 3 4 5 GRN BLU WHT GRY 1 2 3 4 5 6 7 GRY RED WHT 9 8 10 11 GRY GRY GRY GRY GRY GRY RED WHT GRY GRY WHT RY2 N O RY2 COM RY1 COM RY1 N O GRY WHT COM WHT WHT BRN MONITOR SWITCH 1 2 3 RED CNB T1 OVEN THERMAL CUT OUT ORG ORG CNA 1 2 3 4 5 6 GRY WHT BLU 7 GRN...

Page 67: ...0V K 1 VR H 1 CN H D1 D4 1N4002Lx4 D1 1 8 VRS1 10G471K FUSE 2 5A CN A 3 5 T1 PA154DR N O COM COM O L B 3 C10 0 1u 250V J11 RY4 D11 A 1 SM H 5 K 5 H 7 K 7 A 3 FM D10 RY3 RY1 D7 RY2 D5 J10 RY5 D12 R10 120 1 2W B 1 R11 120 1 2W 0 1u 250V C11 N O COM MICRO AC 120V 60Hz A 5 A 7 D2 D3 D4 C1 K 3 H 3 K 2 H 2 H 8 H 9 502 3 SW Reg OUT 24V E 3 H 11 K 4 H 4 K 6 H 6 DRAWER MICROWAVE POWER UNIT CIRCUIT ...

Page 68: ...N C90 D96 D97 K 7 K 8 E 3 SM RY3 FM RY4 24V 10K 35V 10uF SW Reg PWR RY5 Q23 Q26 Q25 KRC101S KRC101S KRC101S P06 P07 270 DOOR POS SW REAR R22 R24 4 7K 4 7K E 1 GND CN E 0 9 D Z 1 9 D Z C43 8 4 C42 C41 C40 R40 R42 R44 R43 R41 1 8KF 360KF 3 57KD 3 32KD IC 5 F 2 F 3 430 1W KIA358 D40 620K 300K 150KF 75KF 37 4KF R7 R5 R6 2K ZD2 HZU16B2 C11 R14 4 7K ZD4 HZU3 6B2 R11 4 7K C10 Q2 Q6 Q5 R15 D22 D21 R16 30 ...

Page 69: ...MWD30 2 6 5 813632 Revision B December 2009 T1 3 2 5A FUSE VRS1 C11 R11 CNA 4 8 1 P 3 7 D11 CNB D10 RY4 RY3 D4 Q1 C1 1 1 3 R10 C10 COM N O R1 ZD1 C2 J10 J11 1 R3 RY1 RY2 D5 DIP D7 RY5 D12 11 CNH 1 2 COM N O D1 D2 D3 PRINTED WIRING BOARD OF POWER UNIT ...

Page 70: ...4 J6 J3 C5 C6 D19 K D20 K ZD2 R7 6 Q26 WHA Q23 Q21 Q25 Q22 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 11 CNJ R40 R36 R38 R37 R35 IC5 IC6 C43 R44 R43 C42 Q96 Q95 5 Q24 C40 CNN CNF 1 1 5 5 R110 R109 R108 R111 CF1 IC1 1 16 Q5 8 9 CNX CNM CNK CNF CNJ CNM Q4 Q3 Q2 R6 R5 R8 CNK WHA CNX 11 12 LCD CNE 1 3 R15 D21 K D22 R16 Q7 E B C C4 C5 S...

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