Magic Chef Mcp13e1st Owner's Manual

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Service Manual

Pizza Baker Built-in Microwaves Combo

Model: KOD-135P9A

DAEWOO ELECTRONICS CORP.

S/M No. :D135P9A000

http : //svc.dwe.co.kr Sep. 2004

✔Caution

: In this Manual, some parts can be changed for improving,

their performance without notice in the parts list. So, if you need the latest parts information, please refer to PPL(Parts Price List) in Service Information Center (http://svc.dwe.co.kr).

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PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWA VE 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 or other micro-

wave source, and make repairs if necessary: (1) Interlock operation, (2) Proper door closing, (3) Seal and sealing surfaces (arcing, wear, and other damage), (4) Damage to or loosening of hinges and latches, (5) Evidence of dropping or abuse.

generating compartments, check the magnetron, wave guide or transmission line, and cavity for proper alignment, integrity, and connections.

(d) Any defective or misadjusted components in the interlock, monitor, door seal, and microwave generation

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.

T ABLE OF CONTENTS

SAFETY AND PRECAUTIONS...........................................................................................................................................3

FOR SAFE OPERATION ......................................................................................................................................3

FOR SAFE SERVICE PROCEDURES .................................................................................................................3

SPECIFICATIONS...............................................................................................................................................................4

EXTERNAL VIEW................................................................................................................................................................4

OUTER DIMENSION.............................................................................................................................................4

FEATURE DIAGRAM............................................................................................................................................5

CONTROL PANEL................................................................................................................................................6

INSTALLATION...................................................................................................................................................................7

OPERATION PROCEDURE(MICROWAVE OVEN)............................................................................................................8

OPERATION PROCEDURE(PIZZA OVEN)........................................................................................................................9

IMPORTANT........................................................................................................................................................................9

CLEANING THE PIZZA OVEN............................................................................................................................................9

HANDLE CONTROLS.......................................................................................................................................................10

ABNORMAL MESSAGE ...................................................................................................................................................10

DISASSEMBLY AND ASSMBLY......................................................................................................................................11

INTERLOCK MECHANISM AND ADJUSTMENT.............................................................................................................18

TROUBLE SHOOTING GUIDE .........................................................................................................................................19

MESUREMENT AND TEST...............................................................................................................................................24

MEASUREMENT OF THE MICROWAVE POWER OUTPUT ............................................................................24

MICROWAVE RADIATION TEST.......................................................................................................................25

COMPONENT TEST PROCEDURE...................................................................................................................26

WIRING DIAGRAM............................................................................................................................................................27

PRINTED CIRCUIT BOARD..............................................................................................................................................28

CIRCUIT CHECK PROCEDURE ........................................................................................................................28

PCB CIRCUIT DIAGRAM....................................................................................................................................31

P.C.B. LOCATION NO ........................................................................................................................................32

EXPLODED VIEW AND PARTS LIST...............................................................................................................................33

DOOR ASSEMBLY .............................................................................................................................................33

CONTROL PANEL ASSEMBLY..........................................................................................................................33

TOTAL ASSEMBLY.............................................................................................................................................33

PIZZAOVEN ASSEMBLY....................................................................................................................................35

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SAFETY AND PRECAUTIONS

1. FOR SAFE OPERATION

Damage that allows the microwave energy (that cooks or heats the food) to escape will result in poor cooking and may cause serious bodily injury to the operator. IF ANY OF THE FOLLOWING CONDITIONS EXIST, OPERATOR MUST NOT USE THE APPLIANCE. (Only a trained service personnel should make repairs.)

(1) A broken door hinge. (2) A broken door viewing screen. (3) A broken front panel, oven cavity. (4) A loosened door lock.

(5) A broken door lock. The door gasket plate and oven cavity surface should be kept clean. No grease, soil or spatter should be allowed to build up on these surfaces or inside the oven. DO NOT ATTEMPT TO OPERATE THIS APPLIANCE WITH THE DOOR OPEN. The microwave oven has concealed switches to make sure the power is turned off when the door is opened. Do not attempt to defeat them. DO NOT ATTEMPT TO SERVICE THIS APPLIANCE UNTIL YOU HAVE READ THIS SERVICE MANUAL.

2. FOR SAFE SERVICE PROCEDURES

1. If the oven is operative prior to servicing, a microwave emission check should be performed prior to servicing the

oven.

2. If any certified oven unit is found to have excessive emission level 5mw/cm

, the service person should: (a) inform the manufacturer, importer or assembler, (b) repair the unit at no cost to the owner, (c) attempt to ascertain the cause of the excessive leakage, (d) tell the owner of the unit not to use the unit until the oven has been brought into compliance.

3. If the oven operates with the door open, the service person should tell the user not to operate the oven and contact the manufacturer and CDRH immediately.

CAUTION

This Device is to be Serviced only by Properly Qualified Service Personnel. Consult the Service Manual for Proper Service Procedures to Assure Continued Safety Operation and for Precautions to be Taken to Avoid Possible Exposure to Excessive Microwave Energy.

CAUTION

MICROWAVE RADIATION PERSONNEL SHOULD NOT BE EXPOSED TO THE MICROWAVE ENERGY WHICH MAY RADIATE FROM

THE MAGNETRON OR OTHER MICROWAVE GENERATING DEVICE IF IT IS IMPROPERLY USED OR CONNECTED. ALL INPUT AND OUTPUT MICROWAVE CONNECTIONS. WAVEGUIDE FLANGES AND GASKETS MUST BE SECURE. NEVER OPERATE THE DEVICE WITHOUT A MICROWAVE ENERGY ABSORBING LOAD ATTACHED. NEVER LOOK INTO AN OPEN WAVEGUIDE OR ANTENNA WHILE THE DEVICE IS ENERGIZED.

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POWER SUPPLY 120V AC 60 Hz SINGLE PHASE WITH EARTHING

POWER CONSUMPTION 1.4 KW

OUTPUT POWER 1000 W MICROWAVE FREQUENCY 2450 MHz OVEN TIMER 59 min. 99 sec.

POWER LEVELS 10 LEVELS

CAVITY DIMENSIONS 380 X 246 X 386 mm (14.9 X 9.7 X 15.2 inch)

CAVITY VOLUME 1.3 Cu.ft PIZZA OVEN POWER CONSUMPTION 1.45 KW OUTSIDE DIMENSIONS (WXHXD) 563 X 450 X 441 mm (22.2 X 17.7 X 17.4 inch) NET WEIGHT APPROX. 19.8 Kg (43.7 lbs)

* Specifications are subject to change without notice.

SPECIFICATIONS

EXTERNAL VIEW

1. OUTER DIMENSION

563

450

441

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03 4 52

987 6

DAEWOO ELECTRONICS

1. Door latch

When the door is closed it will automatically shut off. If the door is opened while the oven is operating, the magnetron will automatically shut off.

2. Door seal

The door seal maintains the microwave within the oven cavity and prevents microwave leakage.

3. Oven cavity

4. Spatter shield

Protects the microwave outlet from splashes of cooking foods.

5. Safety interlock system

Prevents the oven from operating while the door is opened. The oven will only operate with the door fully closed. When the door is open, the oven turns off and will only start again after the door is closed.

6. Door release button

Pushing this button stops oven operation and opens the door.

7. Glass cooking tray

Made of special heat resistant glass. The tray must always be in proper position before operating. Do not cook food directly on the tray.

8. Roller guide

Supports the glass cooking tray.

9. Door screen

Allows viewing of food. The screen is designed so that light can pass through, but not the microwaves.

10. Pizza tray

2. FEATURE DIAGRAM

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y o

8 q

DAEWOO ELECTRONICS

3. CONTROL PANEL

11. Time set pad - Used to set the cooking time and the present time.

12. Display - Cooking time, power level, indicators and present time are displayed.

13. Fresh Pizza - Used to cook Fresh Pizza.

14. Frozen Pizza - Used to cook Frozen Pizza.

15. Manual Cook - Used to cook Manual Cook.

16. Pizza Pause/Cancel - Used to stop Pizza oven operation or to delete the cooking data.

17. Pizza Start - Used to start the Pizza Oven.

18. Power Level - Used to set power level.

19. Auto Defrost - Used to defrost foods.(for weight or time)

10. Auto Reheat - Used to reheat foods.

11. Handy Helper, Kids Meal, Baby Food, Snack Cook - Used to select type of dish to be reheated.

12. One touch Cook - Used to cook or reheat specific quantities of food.

13. Quick Defrost - Used to defrost foods.(for weight only)

14. More - Used to add time to cooking.

15. Less - Used to remove time from cooking.

16. Kitchen Timer - Used as a minute timer.

17. Clock - Used to set clock.

18. Pause/Cancel - Used to stop the microwave oven operation or to delete the cooking data.

19. Start/Express cook - Used to start the Microwave oven and also used to set a reheat time.

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1. Steady, flat location

This microwave oven should be set on a steady, flat surface. This microwave oven is designed for counter top use only.

2. Leave space behind and side

All air vents should be kept a clearance. If all vents are covered during operation, the oven may overheat and, eventually, cause oven failure. Position the oven as far from them as passible.

3. Away from Radio and TV sets

Poor television reception and radio interference may result if the oven is located close to a TV, radio, antenna, or feeder and so on.

4. Away from heating appliances and water taps

Keep the oven away from hot air, steam or splash when choosing a place to position it, or the insulation might be adversely affected and breakdowns occur.

5. Power supply

➢

Check your local power source.

➢

This Pizza baker built-in microwaves combo requires a current of approximately 13 amperes, 120Volts, 60Hz grounded outlet. Power supply cord is about 1.0 meters long.

➢

The voltage used must be the same as specified on this oven. Using a higher voltage may result in a fire or other accident causing oven damage. Using low voltage will cause slow cooking. We are not responsible for damage resulting from use of this oven with a voltage of ampere fuse other than those specified.

➢

This appliance is supplied with cable of special type, which, if damaged, must be repaired with cable of same type. Such a cable can be purchased from DAEWOO and must be installed by a Qualified Person.

6. Examine the oven after unpacking for any damage such as:

A misaligned door, broken door or a dent in cavity. If any of the above are visible, DO NOT INSTALL, and notify dealer immediately.

7. Do not operate the oven if it is colder than room temperature

(This may occur during delivery in cold weather.) Allow oven to become room temperature before operating.

This appliance must be grounded. In the event of an electrical short circuit, grounding reduces the risk of the electric shock by providing an escape wire for the electric current. This appliance is equipped with a cord having a grounding wire with a grounding plug. The plug must be plugged into an outlet that is properly installed and grounded.

INSTALLATION

WARNING

Improper use of the grounding plug can result in a risk of electric shock. Consult a qualified electrician or serviceman if the grounding instructions are not completely understood, or if doubt exists as to whether the appliance is properly grounded, and either:If it is necessary to use an extension cord, use only a 3-wire extension cord that has a 3-blade grounding plug, and a 3-slot receptacle that will accept the plug on the appliance. The marked rating of the extension cord should be equal to or greater than the electrical rating of the appliance, or Do not use an extension cord.

GROUNDING INSTRUCTIONS

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once P-HI 100%

twice P-90 90% 3 times P-80 80% 4 times P-70 70% 5 times P-60 60% 6 times P-50 50% 7 times P-40 40% 8 times P-30 30% 9 times P-20 20%

10 times P-10 10% 11 times P-00 0%

The oven light is on when the microwave oven is operating.

The oven door can be opened at any time during operation by pressing the door release button on the control panel. The oven will automatically shut off.

Each time a pad is touched, a BEEP will sound to acknowledge the touch.

The oven automatically cooks on full power unless set to a lower power level.

The display will show ":0" when the oven is plugged in.

Time clock returns to the present time when the cooking time ends.

When the PAUSE/CANCEL pad is touched during the oven operation, the oven stops cooking and all information retained. To erase all information (except the present time), touch the PAUSE/CANCEL pad once more. If the oven door is opened during the oven operation, all information is retained.

If the START/EXPRESS COOK pad is touched and the oven does not operate, check the area between the door and door seal for obstructions and make sure the door is closed securely. The oven will not start cooking until the door is completely closed or the program has been reset.

This section includes useful information about microwave oven operation.

1. Plug power supply cord into a standard 3- pronged 20Amp, 120V AC 60Hz power outlet.

2. After placing the food in a suitable container, open the oven door and put it on the glass tray. The glass tray and roller guide must always be in place during cooking.

3. Shut the door. Make sure that it is firmly closed.

1 2

3 4

5 6

WATTAGE OUTPUT CHART

• The power-level is set by touching the POWER LEVEL pad. The chart shows the display, the power level and the percentage of power.

Touch POWER pad Power Level (Display) Approximate Percentage of Power

OPERATION PROCEDURE(MICROW AVE OVEN)

Make sure the oven is properly installed and plugged into the electrical outlet.

Touch the PAUSE/CANCEL pad for microwave oven control part. During operation of the microwave oven, pads for pizza oven control part do not work.

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The pizza tray can be opened at any time during operation by pulling out the handle on the pizza tray. The pizza oven will automatically shut off.

Touch the pizza menu pad and the symbol of menu will be displayed. Each time a pad is touched, a BEEP sounds to acknowledge the touch. Enter the cooking time and touch pizza start pad and then the pizza indicator linghts and the cooking time is displayed

and then pizza cooking starts. During the pizza cooking, hot smoke or air may goes out from the gap of the pizza tray. When the pizza PAUSE/CANCEL pad is touched during the oven operation, the pizza stops cooking and all information

retained. To erase all information(except the present time), touch the PAUSE/CANCEL pad once more. If the pizza tray is opened during the pizza operation, all information is retained.

If the pizza START pad is touched and the pizza does not operate, check the pizza tray is closed securely. The pizza oven will not start cooking until the pizza tray is completely closed or the program has been reset.

Before using the pizza oven for the first time, operate the pizza oven without pizza for about 5 minutes in order to burn off residues on the heating elements. You will notice an odor that is characteristics of new heating elements. This is normal and will soon disappear.

Always unplug the Pizza baker built-in microwaves combo and allow the pizza oven to cool completely before cleaning.

Pizza Tray:

Wipe surface with a soft, clean, damp cloth. Never use abrasive cleaners, as they may scratch the surface. Do not use fork or other sharp, metal object to clean the pizza tray, or to remove pizza, as it may damage the pizza tray.

This section includes useful information about pizza oven operation.

1. Plug power supply cord into a standard 3-pronged 20Amp, 120V AC 60Hz power output.

2. Put pizza on the pizza tray.

3. Shut the pizza tray. Make sure that it is firmly closed.

1 2

3 4

NOTE :

When the pizza tray is opened after pizza cooking, hot smoke or air will go out and the pizza tray is very hot. Take out food carefully not to touch hot surfaces of the pizza oven or pizza tray or hot air.

Touch the PAUSE/CANCEL pad for pizza oven control part. During operation of the pizza oven, pads for microwave oven control part do not work.

NOTE :

When the pizza oven is operated several times in series and is overheated, the safety thermal switch works and the heating elements stop operating. So, though the pizza oven seems to operate normally, it does not cook pizza. Open the pizza tray and cool it for 4~5 min. After then the pizza can cook normally.

OPERATION PROCEDURE(PIZZA OVEN)

IMPORTANT

CLEANING THE PIZZA OVEN

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• When using the pizza tray, you must unfold the handle of the pizza tray and check the lever of the handle rise up fully.

• When not using the pizza oven, you would better fold the handle of the pizza tray.

• Before folding the handle of the pizza tray, you must push the lever of the handle.

HANDLE CONTROLS

NOTE :

You’d better not cook pizza over 1.5 inch height like Deep-dish pizza. Those pizza would rise and touch heating element. It may burn the pizza. You’d better not cook the pizza more than two times. Because it may burn or harden the pizza.

When the handle is folded

Lever of the handle

1. Push the lever

2. Fold the handle

Handle

Section

When the handle is unfolded

(Check the lever is fully up.)

• When the temperature sensor is disconnected, “Err 1” message will be shown in the display.

• If the inside temperature of the pizza oven is higher than expected or the temperature sensor doesn't work properly,

“Err 2” message will be shown in the display.

• To disappear the abnormal message, press the CANCEL

button of the pizza oven.

ABNORMAL MESSAGE

* When “Err 1” or “Err 2” message is shown in the display, you must call for service.

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DISASSEMBLY AND ASSEMBLY

- Cautions to be observed when trouble shooting.

Unlike many other appliances, the microwave oven is high-voltage, high-current equipment. It is completely safe during normal operation. However, carelessness in servicing the oven can result in an electric shock or possible danger from a short circuit. You are asked to observe the following precautions carefully.

1. Always remove the power plug from the outlet before servicing.

2. Use an insulated screwdriver and wear rubber gloves when servicing the high voltage side.

3. Discharge the high voltage capacitor before touching any oven components or wiring. (1) Check the grounding.

Do not operate on a two-wire extension cord. The microwave oven is designed to be used while grounded. It is imperative, therefore, to make sure it is grounded properly before beginning repair work.

(2) Warning about the electric charge in the high voltage capacitor.

For about 30 seconds after the operation has stopped, electric charge remains in the high voltage capacitor. When replacing or checking parts, short between oven chassis and the negative high terminal of the high voltage capacitor by using a properly insulated screwdriver to discharge.

4. When the 20A fuse is blown due to the operation of the monitor

switch; replace primary interlock switch, secondary interlock switch and interlock monitor switch.

5. After repair or replacement of parts, make sure that the screws are

properly tightened, and all electrical connections are tightened.

6. Do not operate without cabinet.

CAUTION : Service personnel should remove their watches whenever working close to or replacing the magnetron.

WARNING :When servicing the appliance, take care when touching or replacing high potential parts because of

electrical shock or exposing microwave. These parts are as follows - HV Transformer, Magnetron, HV Capacitor, HV Diode, HV Fuse.

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1. To remove cabinet

1) Remove five screws on cabinet back.

2) Push the cabinet backward.

NOTE : To assemble the pizza oven, push two taps on the bottom of the pizza front plate into two rectangular

notches of the front plate securely.

2. T o take off the pizza oven.

1) Remove four screws on the pizza oven.

2) Push the pizza oven backward and lift up.

3) Reverse the above for assembly.

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4. T o remove door parts.

REF NO. PART NAME PART CODE DESCRIPTION Q’TY

A01 DECORATOR DOOR 3511613600 STS T0.5 H/L 1 A02 BARRIER-SCREEN *O 3517006510 SAN 1 A03 FRAME DOOR 3512204620 ABS 1 A04 STOPPER HINGE *T AS 3515202900 KOR-121M0A 1 A05 DOOR PAINTING AS 3511713600 KOR-131G0A 1 A06 BARRIER-SCREEN *I 3517006400 PE T0.1 1 A07 GASKET DOOR 3512302200 PP 1 A08 HOOK 3513101400 POM 1 A09 SPRING HOOK 3515101900 PW-1 1

(1) Remove the gasket door from door plate. (2) Remove the barrier screen inner from door plate. (3) Remove the door frame from door painting assambly. (4) Remove the stopper hinge top assembly from door painting assambly. (5) Remove the spring and the hook. (6) Remove the barrier screen outer from door frame. (7) Reverse the above steps for reassembly.

3. To remove door assembly

1) Remove two screws which secure the stopper hinge top.

2) Remove the door assembly from top plate of cavity.

3) Reverse the above for reassembly.

NOTE : After replacing the door assembly, perform a check of correct

alignment with the hinge and cavity front plate.

Door As : 3511725200

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5. Method to reduce the gap between the door seal and the oven front surface.

(1) To reduce gap located on part ‘A’.

• Loosen the screw on stopper hinge top, and then

push the door to contact the door seal to oven front surface.

• Tighten the screw.

(2) To reduce gap located on part ‘B’.

• Loosen two screws on stopper hinge under, and then push the door to contact the door seal to oven front surface.

• Tighten two screws.

NOTE : A small gap may be acceptable if the microwave leakage does not exceed 4mW/cm2.

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6. T o remove control panel parts.

1) Remove the screw which secure the control panel, push up two snap fits and draw forward the control panel assembly.

2) Remove the door open lever from the control panel.

3) Remove four screws which secure the PCB assembly to control panel.

4) Disconnect membrane tail from the connector of the PCB assembly.

5) Detach membrane from the control panel.

6) Remove door open button and button spring from the control panel.

7) Reverse the above steps for reassembly.

REF NO. PART NAME PART CODE DESCRIPTION Q’TY

B01 SWITCH MEMBRANE 3518522440 KOD-135P9A 1 B02 CONTROL-PANEL 3516725020 ABS 1 B03 PCB MAIN MANUAL AS PKMPMSBC00 KOD-135P9A 1 B04 SCREW TAPPING 7122401211 T2S TRS 4X12 MFZN 4 B05 LEVER DOOR OPEN 3513702800 PP 1 B06 SPRING BUTTON 441G430171 SWP DIA. 0.7 1 B07 BUTTON DOOR OPEN 3516908140 ABS 1

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7. T o remove high voltage capacitor .

1) Remove a screw which secure the grounding ring terminal of the H.V. diode and the capacitor holder.

2) Remove the H.V. diode from the capacitor holder.

3) Reverse the above steps for reassembly.

8. High voltage circuit wiring

9. T o remove magnetron.

1) Remove a screw which secure the magnetron.

2) Remove the magnetron.

3) Reverse the above steps for reassembly.

NOTE : Never install the magnetron without the metallic gasket plate which is packed with each magnetron to

prevent microwave leakage. Whenever repair work is carried out on magnetron, check the microwave leakage. It shall not exceed 4mW/cm 2 for a fully assembled oven with door normally closed.

Metallic gasket

Magnetron antenna

plate

Cooling fin

Filament terminal

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10. T o remove wind guide assembly.

1) Remove a screw which secure the wind guide assembly.

2) Draw forward the wind guide assembly.

3) Pull the fan from the motor shaft.

4) Remove two screws which secure the motor shaded pole.

5) Remove the motor shaded pole.

6) Reverse the above steps for reasembly.

11. To remove H.V .transformer.

1) Remove four screws holding the H.V.transformer.

2) Remove the H.V.transformer.

3) Reverse the above steps for reassembly.

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INTERLOCK MECHANISM AND ADJUSTMENT

The door lock mechanism is a device which has been specially designed to completely eliminate microwave radiation when the door is opened during operation, and thus to perfectly prevent the danger resulting from the leakage of microwave.

(1) Primary interlock switch

When the door is closed, the hook locks the oven door. If the door is not closed properly, the oven will not operate. When the door is closed, the hook pushes the button of the micro switch. Then the button of the primary interlock switch bring it under NO condition.

(2) Secondary interlock switch and interlock monitor switch / interlock lamp switch

When the door is closed, the hook pushes the lock lever downward. The lock lever presses the button of the interlock monitor switch to bring it under NO condition. The lock lever presses the button of the secondary interlock switch to bring it under NO condition.

(3) Pizza Oven interlock switch

When the pizza tray is closed, the lever pushes the lever of the micro switch. Then the button of the toast interlock switch bring it under NO condition.

(4) Adjustment steps

a) Loosen the one mounting screw. b) Adjust interlock switch assembly position. c) Make sure that lock lever moves smoothly after adjustment is completed. d) Tighten completely two mounting screws.

WH/BK

RD/RD

GN BL

Condition : DOOR OPENCondition : DOOR CLOSE

INTERLOCK LAMP SWITCH(REAR)

ADJUSTMENT :

Interlock monitor switch When the door is closed, the interlock monitor switch should be changed (NO condition) before other switches are closed.

When the door is opened, the interlock monitor switch should be changed (NC condition) after other switches are opened.

NOTE :

Microwave emission test should be performed after adjusting interlock mechanism. If the microwave emission exceed 4mW/cm 2 , readjust interlock mechanism.

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TROUBLE SHOO TING GUIDE

Following the procedure below to check if the oven is defective or not.

1) Check grounding before trouble checking.

2) Be careful of the high voltage circuit.

3) Discharge the high voltage capacitor.

4) When checking the continuity of the switches, fuse or high voltage tranformer, disconnect one load wire from these parts and check continuity with the AC plug removed. To do otherwise may result in a false reading or damage to your meter.

(TROUBLE 1) Oven does not operate at all : any inputs can not be accepted.

NOTE :

When electric parts are checked, be sure the power cord is not inserted the wall outlet.

Check wire harness, wiring and connection of the terminals and power cord before check the parts listed below.

CONDITION CHECK

Check continuity of interlock monitor switch with door closed (COM

NC)

Check continuity of both primary and secondary interlock switch with door closed

Malfunction of interlock monitor switch

Malfunction of interlock switch

RESULT

Continuity

No Continuity

CAUSE REMEDY

Replace NOTE 1

Fuse blows.

Replace NOTE 1

Shorted contacts of primary interlock switch.

Continuity

Replace NOTE 1

Check continuity of primary interlock switch contact with door partially open until interlock monitor switch contact close (COM NC)

Defective low voltage transformer

0 or infinite

Approx.

1160

(normal)

Replace

Check continuity of primary winding of low voltage transformer

Defective high voltage transformer

Fuse again

blows

Replace Disconnect high voltage fuse and operate the unit

No Continuity

Continuity

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NOTE 1

All these switches must be replaced at the same time, please refer to

Interlock Mechanism And Adjustment .

(TROUBLE 2) Display shows all figures selected, but oven does not start cooking, even though desired program and

time are set and start pad is pressed.

CONDITION CHECK

Check continuity of magnetron

Defective

magnetron

RESULT

Continuity

CAUSE REMEDY

Replace

Outlet has

proper

voltage Fuse

does not

blow.

Check continuity of

noise filter board

Defective line

filter board

Continuity

Replace

Check continuity of

power supply cord

Open power

supply cord

Continuity

Replace

Defective touch

control circuit

Normal

Adjust

CONDITION CHECK

Check continuity of primary

interlock switch

Malfunction of

primary interlock

switch

RESULT

Continuity

CAUSE REMEDY

Adjust or

replace

Turntable motor and oven lamp

do not turn

Check continuity of secondary interlock and D.O.M. switches

Malfunction of

primary interlock

and D.O.M.

switch

Continuity

Adjust or

replace

Check D.C. voltage being

supplied to RELAY (RY2) coil

Defective touch

control circuit

0 V Replace

Faulty contacts of

RELAY (RY2) or

open relay coil

Approx.

15 VDC

Replace

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(TROUBLE 3) No microwave oscillation even though fan motor rotates.

CONDITION CHECK RESULT

Check continuity of

high voltage capacitor terminals

with wires removed

Continuity

CAUSE

Defective high voltage transformer

Defective high voltage

fuse

REMEDY

Replace

microwave

oscillation

Check continuity of

high voltage rectifier in forward

and backward

direction with DC megger

Continuity

in backward

direction

Defective high

voltage rectifier

Replace

Connect megger leads to

magnetron terminal and

magnetron body

Continuity

Defective

magnetron

Check resistance of primary and secondary coil of high voltage transformer

0 or

Defective high voltage transformer

Replace

Check continuity of

high voltage fuse

No microwave oscillation

continuity

Check continuity of magnetron heater with wires removed

No continuity

Defective

magnetron

Replace

Check continuity of filament terminal of high voltage transformer

No continuity

Defective high

voltage

transformer

Replace

Check D.C voltage

being supplied to

RELAY (RY1) coil

0 V

Defective

touch control

circuit

Replace

Approx. 15V DC

Faulty contacts of

RELAY

(RY1) or open

relay coil

Replace

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(TROUBLE 4)

Pizza Oven is not heated;

CONDITION CHECK

Check continuity of

spring flat

Malfunction of

spring flat

RESULT

continuity

CAUSE

REMEDY

CAUSE

REMEDY

Adjust or

replace

Toaster

heater is

not heated.

Check D.C voltage

being supplied to

RELAY (RY3) coil

Faulty contacts of

RELAY

(RY3) or open

relay coil

Replace

Check continuity of

interlock switch

Malfunction of

interlock switch

continuity

Adjust or

replace

Defective touch

control circuit

Approx. 15V DC

Replace

Check continuity of

- heater assy

Defective heater

assy

continuity

Replace

(TROUBLE 5)

1) Fan motor does no rotate.

CONDITION CHECK

Check continuity of

primary interlock switch

Malfunction of

primary Interlock

switch

RESULT

continuity

Adjust or

replace

1)Fan

motor does

not rotate.

Check D.C voltage

being supplied to

RELAY (RY4) coil

Faulty contacts of

RELAY

(RY4) or

open relay coil

Replace

Check continuity of secondary interlock

switch

Malfunction of

secondary

interlock switch

continuity

Adjust or

replace

Defective touch

control circuit

Approx. 15V DC

Replace

Check continuity of

(heater or motor)

Defective motor

continuity

Replace

Page 23

(TROUBLE 6) The following visual conditions indicate a probable defective touch control circuit or membrane switch

assembly

1. Incomplete segments,

1) Segments missing.

2) Partical segments missing.

3) Digit flickering other than normal display slight flickering.

4) " :0" does not display when power is on.

2. A distinct change in the brightness of one or more numbers exists in the display.

3. One or more digits in the display are not on when they should be.

4. Display indicates a number different from one touched.

5. Specific numbers (for example 2 or 3) will not display when the panel is touched.

6. Display does not count down or up with time cooking or clock operation.

7. Oven is programmable and cooks normally but no display shows.

8. Display obviously jumps in time while counting down.

9. Display counts down noticeably too fast while cooking.

10. Display does not show the time of day or " :0" when clear pad is touched.

11. Oven lamp and turntable motor do not stop although cooking is finished. Check if the RELAY 2 contacts close if they are close, replace touch control circuit.

NOTE

Before following the particular steps listed above in the trouble shooting guide for the membrane keyboard’s, failure, please check for the continuity of each wire-harness between the membrane keyboard and P.C.B. assembly.

CONDITION CHECK

Check each pad for

continuity of the membrane

keyboard for the following

keyboard check procedure

Malfunction

of pcb assembly

RESULT

Normal

CAUSE REMEDY

Replace pcb

assembly

Malfunction

of the membrane

keyboard

Abnormal

Replace the

membrane

keyboard

Display does

not show

programming

at all, even if

keyboard is

touched.

Micro Def. Timer Pizza lb

Page 24

MEASUREMENT AND TEST

1. MEASUREMENT OF THE MICROW AVE POWER OUTPUT

Microwave output power can be checked by indirectly mmeasuring the temperature rise of a certain amount of water exposed to the microwave as directed below.

PROCEDURE

1. Microwave power output measurement is made with the microwave oven supplied at rated voltage and operated at its maximum microwave power setting with a load of 1000

5cc of potable water.

2. The water is contained in a cylindrical borosilicate glass vessel having a maximum material thickness of 3 mm and an outside diameter of approximately 190 mm.

3. The oven and the empty vessel are at ambient temperature prior to the start of the test. The initial temperature of the water is 10 2

C (50 3.6 F). If is measured immediately before the water is added to the vessel. After addition of the water to the vessel, the load is immediately placed on the center of the shelf, which is in the lowest normal position.

4. Microwave power is switched on.

5. Heating time should be exactly A seconds. (Refer to table as following) Heating time is measured while the microwave generator is operating at full power. The filament heatup time for magnetron is not included.

6. The initial and final temperature of water is selected so that the maximum difference between the ambient and final water temperature is 5K.

7. The microwave power output P in watts is calculated from the following formula:

T is difference between initial and ending temperature.

t is the heating time.

The power measured be B (Refer to SPECIFICATIONS) W

10.0 %.

Heating time for power output:

CAUTION

1. Water load should be measured exactly to 1 liter.

2. Input power voltage should be exactly specified voltage (Refer to SPECIFICATIONS).

3. Ambient temperature should be 20

2 C (68 3.6 F)

P =

4187 X

600

650

700

750

800

850

900

950421000401050381100

A (second)

B (W)

Page 25

2. MICROWAVE RADIATION TEST

PROCEDURES

1. Prepare Microwave Energy Survey Meter, 600cc glass beaker, and glass thermometer 100˚C(212˚F).

2. Pour 275cc±15cc of tap water initially at 20±5˚C(68±9˚F) in the 600cc glass beaker with an inside diameter of approx.

8.5mm(3.5in.).

3. Place it at the center of the tray and set it in a cavity.

4. Close the door and operate the oven.

5. Measure the leakage by using Microwave Energy Survey Meter with dual ranges, set to 2450MHz.

1) Measured radiation leakage must not exceed the value prescribed below. Leakage for a fully assembled oven with

door normally closed must be less than 4mW/cm

2) When measuring the leakage, always use the 5cm(2in.) space cone with probe. Hold the probe perpendicular to the cabinet and door. Place the space cone of the probe on the door, cabinet, door seem, door viewing screen, the exhaust air vents and the suction air vents.

3) Measuring should be in a counter-clockwise direction at a rate of 1 in./sec. If the leakage of the cabinet door seem is

unknown, move the probe more slowly.

4) When measuring near a corner of the door, keep the probe perpendicular to the areas making sure the probe end at the base of the cone does not get closer than 2 in. from any metal. If it does not, erroneous reading may result.

CAUTION :

1. Make sure to check the microwave leakage before and after repair of adjustment.

2. Always start measuring of an unknown field to assure safety for operating personnel from microwave energy.

3. Do not place your hands into any suspected microwave radiation field unless the safe density level is known.

4. Care should be taken not to place the eyes in direct line with the source of microwave energy.

5. Slowly approach the unit under test until the radiometer reads an appreciable microwave leakage from the unit under the test.

Page 26

3. COMPONENT TEST PROCEDURE

• High voltage is present at the high voltage terminal of the high voltage transformer during any cooking cycle.

• It is neither necessary nor advisable to attempt measurement of the high voltage.

• Before touching any oven components or wiring, always unplug the oven from its power source and discharge the

capacitor.

1. High voltage transformer

(1) Remove connections from the transformer terminals and check continuity. (2) Normal readings should be as follows:

Secondary winding...................Approx. 110Ω±10%

Filament winding....................................Approx. 0Ω

Primary winding.....................................Approx. 1Ω

2. High voltage capacitor

(1) Check continuity of capacitor with meter on the highest OHM scale. (2) A normal capacitor will show continuity for a short time, and then indicate 10MΩ once the capacitor is charged. (3) A shorted capacitor will show continuous continuity. (4) An open capacitor will show constant 10MΩ. (5) Resistance between each terminal and chassis should be infinite.

3. High voltage diode

(1) Isolate the diode from the circuit by disconnecting the leads. (2) With the ohmmeter set on the highest resistance scale measure the resistance across the diode terminals.

Reverse the meter leads and again observe the resistance reading. Meter with 6V, 9V or higher voltage batteries should be used to check the front-back resistance of the diode, otherwise an infinite resistance may be read in both directions. A normal diode’s resistance will be infinite in one direction and several hundred KΩ in the other direction.

4. Magnetron

For complete magnetron diagnosis, refer to “Measurement of the Microwave Power Output”. Continuity checks can only indicate and open filament or a shorted magnetron. To diagnose for an open filament or a shorted magnetron.

(1) Isolate magnetron from the circuit by disconnecting the leads. (2) A continuity check across magnetron filament terminals should indicate 0.1Ω or less. (3) A continuity check between each filament terminal and magnetron case should read open.

5. Fuse

If the fuse in the primary and monitor switch circuit is blown when the door is opened, check the primary and monitor switch before replacing the blown fuse. In case the fuse is blown by an improper switch operation, replace the defective switch and fuse at the same time. Replace just the fuse if the switches operate normally.

Page 27

WIRING DIAGRAM

Page 28

PRINTED CIRCUIT BO ARD

1. CIRCUIT CHECK PROCEDURE

1. Low voltage transformer check

The low voltage transformer is located on the P.C.B. Measuring condition: Input voltage: 120V / Frequency: 60Hz

2. Voltage Check

- Key check point

- Check method

NOTE

1. Refer to Ciruit Diagram (point 4).

2. Secondary side voltage of the low voltage transformer changes in proportion to fluctuation of power source voltage.

3. The allowable tolerance of the secondary voltage is within

5% of nominal voltage.

NOTE

Each measure point must be measured with GND points.

Terminal Voltage

7-8

LOAD

NO LOAD AC 14.5 V

NO CHECK POINT REMARK

1 IC1 PIN 5 +5VDC 2 IC1 PIN 8(INT)

3 IC1 PIN 35 OR 36

T : 16.67ms(60Hz)

T : 250 ns(4MHz)

NO MEASURE POINT WAVE FORM REMEDY REMARK

1 MP1 DC +5V 0.25V Replace VL1, EC1 NO LOAD 2 MP2 DC +12V 2.0V Replace EC2, D11,12,13 NO LOAD

Page 29

Measure Point

MP2

MP1

Page 30

3. When there is no microwave oscillation

1) When touching START pad, oven lamp turns on and turntable rotates.

but fan motor does not rotate.

Cause : RELAY 1, 4 does not operate.

refer to Circuit Diagram (point 2, 3)

- Check method

2) When touching START pad, oven lamp turns on.

Fan motor and turntable rotate and cook indicator in display comes on.

Cause : RELAY 1 does not operate. refer to Circuit Diagram (point 3)

- Check method

4. When Pizza Oven is not heated.

Cause : RELAY 3 does not operate. refer to Circuit Diagram (point 6)

- Check method

5. When the door is opened during operation, the count down timer does not stop.

refer to Circuit Diagram (point 1)

- Check method

6. When the digital clock does not operate properly.

refer to Circuit Diagram (point 5)

If clock does not keep exact time, you must check D14,R26,R27,ZD2,C9.

POINT

STATE

RELAY 1, 4 ON +5VDC GND

RELAY 1, 4 OFF GND +15VDC

POINT

STATE

RELAY 1 ON +5VDC GND

RELAY 1 OFF GND +15VDC

POINT

STATE

RELAY 3 ON +5VDC GND

RELAY 3 OFF GND +15VDC

POINT

STATE

1) DOOR OPEN OPEN +5VDC

2) DOOR CLOSED CLOSE GND

CHECK NO METHOD REMEDY

1 Check the stage(ON, OFF) of the door open monitor Replace door open monitor switch.

switch by resistance measurement.

POINT WAVE FORM

T: 16.67 ms(60Hz)

Page 31

2. PCB CIRCUIT DIAGRAM

Page 32

NO NAME SYMBOL SPECIFICATION PART CODE Q’TY

1 BUZZER BZ1 BM-20K 3515600100 1 2 C ARRAY CA1 7P(6) 1000PF M 50V CN6XB-102M 1 3 CAPACITOR CERA C8 102 50V Z AXIAL CCZB1H102K 1 4 CAPACITOR CERA C1~7,C9,C10 104 50V Z AXIAL CCZF1H104Z 9 5 CAPACITOR ELEC EC1 50V RS 10UF CEXE1H100A 1 6 CAPACITOR ELEC EC2 25V RSS 1000MF CEXF1E102V 1 7 CONNECTOR WAFER CN1 YW396-03V 3519150530 1 8 CONN WAFER CN2 35312-0310 30166M5030 1

9 CONNECTOR WAFER CN3 FCZ 254-11 441M367160 1 10 CONNECTOR WAFER CN4 YW396-07AV 3519150540 1 11 DIODE RECTIFY D1~11, D14 1N4148 DZN4148--- 12 12 DIODE RECTIFY D12,13 KN4004A DZN4004A-- 2 13 DIODE ZENER ZD1 UZ- 3.3BSB 1/2W DZUZ3R3BSB 1 14 DIODE ZENER ZD2 UZ- 5.1BSB 1/2W DZUZ5R1BSB 1 15 IC MICOM IC1 HMS87C1708B- 150SD135P- 1 16 LED DISPLAY DP1 LTC-4651HG(631) DDDG631H02 1 17 PCB MAIN M314 90X163.7 3514330600 1 18 R ARRAY RA1 8P(7) 1/8 100K OHM J RA-88X104J 1 19 R ARRAY RA2 7P(6) 1/8 100K OHM J RA-87X104J 1 20 R CARBON FILM R4~10 1/6W 330 5% RD-AZ331J- 7 21 R CARBON FILM R1,3,13,16,22,23,29 1/6W 1K 5% RD-AZ102J- 7 22 R CARBON FILM R19 1/6W 4.7K 5% RD-AZ472J- 1 23 R CARBON FILM R15 1/6W 200 5% RD-AZ201J- 1 24 R CARBON FILM R14,R26,R27 1/6W 10K 5% RD-AZ103J- 3 25 R CARBON FILM R2,R12 1/6W 100K 5% RD-AZ104J- 2 26 R CARBON FILM R17 1/6W 1M 5% RD-AZ105J- 1 27 R CARBON FILM R24,R25 1/4W 180 5% RD-4Z181J- 2 28 R CARBON FILM R28 1/2W 27 5% RD-2Z270JS 1 29 R METAL FILM R11 1/6 10K OHM 1% RN-AZ1002F 1 30 R METAL FILM R18 1/6 120K OHM 1% RN-AZ1203F 1 31 RESONATOR CERA CR1 CRT 4.00MS 5P4R00MTS- 1 32 IC REGULATOR VL1 MC7805C 1CPMC7805C 1 33 TRANSISTOR Q1~5 KRA106M TZRA106M-- 5 34 TRANSISTOR Q7,Q9~12 KRC106M TZRC106M-- 5 35 TRANSISTOR Q6 KTA-1266Y TZTA1266Y- 1 36 TRANSISTOR Q8 KTC3198GR TZTC3198GR 1 37 TRANS POWER LVT1 DMR-161P 5EPU035303 1 38 SW RELAY RY1,RY3 G5G-1A-DT DC12V 5SC0101123 2 39 SW RELAY RY2,RY4 CS11-12SH 1C 1P 5SC0101128 2 40 WIRE COPPER

J1,2,4~8,10~13,J16,SJ1,3

1/0.52 TIN COATING 85801052GY 14

41 WIRE COPPER J3,9,14,15 1/0.52 TIN COATING 85801052GY 4

3. P.C.B. LOCATION NO.

Page 33

EXPLODED VIEW AND PARTS LIST

1. DOOR ASSEMBLY

Refer to Disassembly and assembly

2. CONTROL PANEL ASSEMBLY

Refer to Disassembly and assembly

3. TOTAL ASSEMBL Y

Page 34

NO PART NAME PART CODE DESCRIPTION Q'TY

A00 DOOR AS 3511725200 KOD-135P9A 1 B00 CONTROL-PANEL AS 3516732500 KOD-135P9A 1

C00 ASSY PIZZA OVEN 3510022000 KOD-135P9A 1

F01 CAVITY AS 3516111500 KOR-131G0A 1 F02 CABINET AS 3510808700 KOD-135P9A 1 F03 CORD POWER AS 35113T5W0L 3X16AWG 80X80 120-RTML 1 F04 NOISE-FILTER 3518607500 DWLF-M20-1 1 F05 MOTOR SHADED POLE 3963822200 120V 30W OEM-15DWX1-B07 1 F06 GUIDE WIND 3512520000 PP 1 F07 FAN 3511800100 P.P GF20 1 F08 MAGNETRON 3518002900 2M218J(F)P 6CF 1 F09 HOLDER HV CAPACITOR 3513003200 SECC T0.6 1 F10 CAPACITOR HV 3518302100 2100VAC 0.95UF #187 1 F11 DIODE HV 3518400400 HVR-1X-3AB 12KV #187 1 F12 TRANS HV 3518117930 DWAR10A0-13T 1 F13 BASE 3510313400 SBHG T0.7 1 F14 FOOT 3512100900 PP DASF-130 2 F15 STOPPER HINGE *U AS 3515202800 KOR-121M0A 1 F16 SW MICRO 4415A17352 VP-533A-OF SPNO #187 200G 1 F17 SWITCH PUSH 3518571000 MP101C 1 F18 SW MICRO 4415A66600 VP-532A-OF SPNC #187 200G 1 F19 SW MICRO 4415A66910 VP-531A-OF/SZM-V16-FA-61 1 F20 LEVER LOCK 3513702600 POM 1 F21 LOCK 3513814300 POM M90-02 F20 1 F22 LAMP 3513601500 BL 125V 25W T25 C5A H187 1 F23 HARNESS MAIN 3512781500 KOD-135P9A 1 F24 MOTOR SYNCRO 3966820200 120V 2W GM-16-12F17 1 F25 THERMOSTAT 3518905400 OFF:90 ON:60 H #187 NB 1 F26 HOLDER THERMOSTAT 3513003410 PP(BK) 1 F27 STOPPER HINGE *T AS 3515202900 KOR-121M0A 1 F28 COVER WAVE GUIDE 3511406200 HEATPROOF PP 1 F29 COUPLER 3517400620 XAREC 1 F30 GUIDE ROLLER AS 3512512920 KOR-121Q4A 1 F31 TRAY 441X335A10 BORO-S1 GLASS(NEG) 1

✔ Caution

In this Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the latest parts information, please refer to PPL(Parts Price List) in Service Information Center (http://svc.dwe.co.kr).

Page 35

4. PIZZA OVEN ASSEMBLY (C00)

Page 36

NO PART NAME PART CODE DESCRIPTION Q'TY

1 HANDLE PIZZA *T 3512605400 ABS 1 2 HANDLE PIZZA *U 3512605500 ABS 1 3 LEVER HANDLE 3513703200 PC 1 4 SPRING HANDLE 3515102800 SWP 1 5 BRACKET HANDLE 3510609200 ABS 1 6 SHAFT HANDLE 3514901400 SWRM3 1 7 PANEL PIZZA 3514200600 PC 1 8

SUPPORTER PIZZA PANEL

3515308700 PBT 1

9 PLATE PIZZA PANEL 3514502800 SBHG T0.6 1 10 TRAY PIZZA 3517210300 SA1D T0.6, Teflon coating 1 11 HEATER PIZZA *T 3512806500 KOD-135P9A 1 12 PLATE TOP 3514502600 SBHG T0.4 1 13 PLATE REAR 3514502700 SECC T0.5 1 14 SENSOR TEMPERATURE 3514801400 PTM-K312-D7 1 15 HEATER PIZZA *U 3512806600 KOD-135P9A 1 16 THERMOSTAT 3518907000 OFF:130 ON:60 V #187 1 17 PLATE SIDE 3514502500 SBHG T0.4 1 18 LEVER SW MICRO 3513703300 KOD-135P9A(SPNO) 1 19 PLATE FRONT 3514502400 SBHG T0.6 1 20 COVER FRONT 3511411400 PBT 1 21 FRAME PIZZA 3512208900 PC 1 22 PROTECTOR FRAME 3517504700 STS T0.5 H/L 1 23 DECORATOR PIZZA 3511613900 STS T0.5 H/L 1

Page 37

S/M NO. : D135P9A000

DAEWOO ELECTRONICS CORP.

686, AHYEON-DONG MAPO-GU SEOUL, KOREA C.P.O. BOX 8003 SEOUL, KOREA TELEX: DWELEC K28177-8 CABLE: “DAEWOOELEC”

PRINTED DATE: Sep. 2004