Daewoo KOC-984TB Service Manual

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S/M No. : C972T0S002

Service Manual

Microwave Oven

Model: KOC-972T0S

KOC-972T2S KOC-982T1S KOC-982T2S

KOC-983T1S KOC-983T2S KOC-984T1S KOC-984T2S

KOC-985T1S KOC-985T2S

✔

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).

DAEWOO ELECTRONICS CO., LTD.

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PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSI VE MICR OWAV E 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 microwave

source, and make repairs as 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.

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SAFETY AND PRECAUTIONS........................................................................................................... 2

SPECIFICATIONS............................................................................................................................... 3

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

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

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

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

EARTHING INSTRUCTIONS............................................................................................................... 7

CONTROL PAN E L .. ......... ... ......... ... ... ......... ... ......... ... ......... ... ... ......... ... ........ ... ......... ... ... .................... 8

DISASSEMBLY AND ASSEMBLY...................................................................................................... 9

INTERLOCK MECHANISM AND ADJUSTMENT............................................................................... 23

TROUBLE SHOOTING GUIDE .......... ... ......... ... .................. ... ......... ... ........ ... ... ......... ... ......... ... ........... 24

MEASUREMENT AND TEST............................................................... ................. ......... ......... ........... . 30

1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT ...................................................... 30

2. ELECTRICAL CONTINUITY CHECK OF INTERLOCK SWITCH................................................. 31

3. MICROWAVE RADIATION TEST................................................................................................. 32

4. COMPONENT TEST PROCEDURE............................................................................................. 33

WIRING DIAGRAM.............................................................................................................................. 34

SCHEMATIC DIAGRAM...................................................................................................................... 35

EXPLODED VIEWS AND PARTS LIST.............................................................................................. 38

PRINTED WIRING BOARD................................................................................................................. 44

P.C.B. CIRCUIT DIAGRAM................................................................................ ......... ......... ............... 49

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SAFETY AND PRE CAUTIONS

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 servicing, a microwave emission check should be performed prior to servicing the oven.

(1) inform the manufacturer, importer or assembler,

(2) repair the unit at no cost to the owner,

(3) attempt to ascertain the cause of the excessive leakage,

(4) 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 immediately.

IMPORTANT

The wire in this m ains lead coloured in accordance with the following code. Green-and-yellow : Earth

Blue : Neutral Brown : Live

As the colours of the wires in the mains lead of this appliance may not correspond w ith the coloured m arkings identifying the terminals in your plug, proceed as follows. The wire which is coloured green-and-yellow must be connected to the term inal in the plug which is marked with the letter 'E' , earth symbol or coloured green-and-yellow. The wire which is coloured blue must be connected to the terminal which is marked with the letter 'N' or coloured black. The wire which is coloured brown must be connected to the term inal w hich is marked with the letter 'L' or coloured red.

NOTE

This oven is designed for counter-top use only.

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SPECIFICATIONS

MOD EL KOC-972T0S KOC-972T2S POWER S U P P LY 230V~50Hz 230V~50Hz

MICROWAVE 1450W 1450W GRILL 1200W 1200W

POWER CONSUMPTION

MICRO WAVE ENER G Y OU TPUT 950W(IEC705) 950W(IEC705) MICRO WAVE FREQ UEN CY 2450MHz 2450MHz OUTS IDE DIMENSIONS (W X H X D) 526 x 345 x 413 mm (20.7 x 13.6 x 16.1 in.) CAVIT Y D IMENSIONS (W X H X D) 335 x 255 x 339 mm (13.2 x 10.0 x 13.3 in.) NET W E IGHT APPRO X. 20 Kg (44.2 lbs.) TIMER 60 minutes FUNCTION SELECTIONS MICROWAVE/G RILL/CONVECTION/COMBI POWER SELECTIONS 10 LEVELS CAVITY VOLUME 1.0 Cu.Ft.

CONVECTION 1550W 1550W PRO G R A M C O OK 1850W 1850W COM BINATION 2600W (Simultaneous) 1550W (Sequential)

MOD E L KOC -982T/983T/984T/985T1S KOC-982T/983T/984T/985T2S POWER S U P P LY 230V~50Hz 230V~50Hz

MICROWAVE 1450W 1450W GRILL 1200W 1200W

POWER CONSUMPTION

MICRO WAVE ENER G Y OU TPUT 1000W(IEC705) 1000W(IEC705) MICRO WAVE FREQ UEN CY 2450MHz 2450MHz OUTS IDE DIMENSIONS (W X H X D) 526 x 345 x 496 mm (20.7 x 13.6 x 19.5 in.) CAVIT Y D IMENSIONS (W X H X D) 335 x 250 x 339 mm (13.2 x 9.8 x 13.3 in.) NET W E IGHT APPRO X. 21 Kg (46.3 lbs.) TIMER 60 minutes FUNCTION SELECTIONS MICROWAVE/G RILL/CONVECTION/COMBI POWER SELECTIONS 10 LEVELS CAVITY VOLUME 1.0 Cu.Ft.

CONVECTION 1550W 1550W PRO G R A M C O OK 1850W 1850W COM BINATION 2600W (Simultaneous) 1550W (Sequential)

SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE.

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EXTERNAL VIEW

1. OUTER DIMENSION

KOC-972T

KOC-982T/983T/984T/ 985T

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2. FEATURE DIAGRAM

KOC-972T

EXTERNAL VIEW

Door seal

Door hook

the magnetron will immediately stop operating.

Door viewing screen

Top heater

Oven lamp

Safety interlock system

Control panel

Turntable tray

It can also be used as a cooking utensil.

Oven front plate

Rotating base

10.

This is to remain in the oven for all cooking. It should only be removed for cleaning.

Under heater

11.

- Door seal maintains the microwave energy within the oven cavity and prevents m icrowave leakage.

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

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

- Turns on when convection, grill and combi cooking is selected.

- Automatically turns on during oven operating.

- Rotates during cooking and ensure even distribution of Microwaves.

- This fits over the shaft in the center of the ovens cavity floor.

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EXTERNAL VIEW

KOC-982T/983T/984T/985T

1. Door seal - Door seal maintains the microwave energy within the oven cavity and prevents microwave leakage.

2. Door hook - When the door is closed, it will automatically shut. If the door is opened while the oven is operating,

the magnetron will immediately stop operating.

3. Door viewing screen - Allows viewing of food. The screen is designed so that light can pass through, but not the microwave.

4. Top heater - Turns on when convection, grill and combi cooking is selected.

5. Oven lamp - Automatically turns on during oven operating.

6. Safety interlock system

7. Control panel

8. Turntable tray - Rotates during cooking and ensure even distribution of Microwaves.

It can also be used as a cooking utensil.

9. Oven front plate

10. Rotating base - This fits over the shaft in the center of the ovens cavity floor.

This is to remain in the oven for all cooking. It should only be removed for cleaning.

11. Under heater

12. Metal rack

13. Convection outlet & Fan

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INSTALLATION

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 failure.

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.

Position the oven as far from them as possible.

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 microwave oven requires a current of approximately 13amperes, 230 Volts, 50 Hz.

Power supply cord is about 1.2 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 dam age 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 the oven to become room temperature before operating.

EARTHING INSTRUCTIONS

This appliance must be earthed. In the event of an electrical short circuit, earthing 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 earthing wire with a earthing plug. The plug must be plugged into an outle t that is properly installe d and earthed.

WARNING

Improper use of the earthing plug can result in a risk of electric shock. Consult a qualified electrician or serviceman if the earthing instructions are not completely understood, or if doubt exists as to whether the appliance is properly earthed, and either: If it is necessary to use an extension cord, use only a 3-wire extension cord that has a 3-blade earthing plug, and a 3-slot receptacle that will acc e pt t h e p lu g o n 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.

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C ONTROL PANEL

When blinking, the oven is operating in "COMBI" cooking mode.

When blinking, the oven is operating in "GRILL" cooking mode.

When blinking, the oven is operating in "MICROWAVE" cooking mode.

When blinking, the oven is operating in "PROGRA M COOK" cooking mode.

When blinking, the oven is operating in "PIE" cooking mode.

When blinking, the oven is operating in "CONV ECTION" cooking mode.

Microwave Power Level-

Used to select the variable

microwave power level. If

this button(pad) is pressed for more than 1.3 sec, number is scrolled up au tomatically.

Dial Kn ob-

Used to input the cooking time and weight.

MW GRILL

PROGRAM

PIE

COOK

M/W

GRILL

COOK

DEFROST

COMBI

PROG RA M COOK

1.ROAST BEEF

2.ROAST PORK

3.ROAST CHICKEN

4.FISH FILLET

5.VEGETABLE

SPEEDY COOK

WEIGHT - TIMECOMBI

KGTEMP

DEFROST

TEMP

PIE

When blinking, the oven i s operating in "WEIGHT DEFROST" cooking mode.

When blinking, the oven i s operating in "TIME DEFROST" cooking mode.

When blinking, the oven i s operating in weght input mode.

Temperature Button(pad)-

Used to set desired temperature. If this button is pressed for more than

1.3 sec, number is scrolled up automatically.

Function Buttons(pads)-

Used to select desired cooki ng function.

M/W : MICROWAVE GRILL DEFROST : TIME or WEIGHT

DEFROST TEMP : CONVECTION COMBI : COMBINATION PIE PROGRAM COOK

Speedy Cook Button(pad)-

Used to program quickly cooking time in 30 sec increments.

Stop/ Cl ear Button-

Used to pause and clear all information man u ally put into the oven.

STOP/CLEAR

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START

(START/CLOCK)

Start Button-

Used to start the selected cooking cycle.

(KOC-972T)

Start/Clock Button-

Used to start the selected cooking cycle and to set time.

(KOC-982T/983T/984T/985T)

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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 safety 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 ware rubber gloves when servicing the high voltage side.

3. Discharge the high voltage capacitor before touching any oven components or wiring.

(1) Check the earthed.

Do not operate on a two-wire extension cord.

The microwave oven is designed to be used with earthed.

It is imperative, therefore, to make sure it is earthed properly before

beginning repair work.

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

For about 30 seconds after the operation stopped and 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 15A fuse is blown out 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, need a care of 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.

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D ISASSE MBLY AN D A SSE M BLY

1. To remove cabinet

(1) Remove four screws on cabinet back. (2) Push the cabinet backward.

2. To remove guide wind assembly

(1) Remove two screws for earthing and for fixing to rear-plate. (2) Remove the noise filter from the guide wind. (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 reassembly.

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3. To remove H.V.transformer

(1) Remove four screws which secure

the H.V.transformer to the base plate. (2) Remove the H.V.transformer. (3) Reverse the above steps for reassembly.

4. To 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.

D ISASSEMBLY AND ASSEMBLY

High voltage circuit wiring

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D ISASSE MBLY AN D A SSE M BLY

5. To remove magnetron

(1) Remove three screws which secure the magnetron. (2) Remove the magnetron. (3) Reverse the above steps for reassembly.

CAUTION

Never install the magnetron without the m etallic gas k e t p la te wh ic h is p ac k e d with e a c h magnetron to prevent microw ave leakage. Whenever repair work is carried out on m agnetron, check the microw ave leakage. It shall not

exceed 4mW /cm

for a fully assembled oven with door normally closed.

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✔ Caution:

In this Service 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)

6. To remove control panel assembly

KOC-972T, KOC-98 2T

(1) Remove a screw which secure the control panel assembly to

the oven front plate.

At the same time, draw forward the control panel assembly

from the oven front plate. (2) Remove nine screws which secure the main and

sub PCB assembly to control panel. (3) Remove buttons and dial knob.

D ISASSEMBLY AND ASSEMBLY

REF NO. PART CODE PART NAME DESCRIPTION QTY REMARK

B01 3516715120 CONT RO L-PANEL A BS XR -401 1 B02 3515501210 WINDO W DISPLAY PMM A IF-850 1 B03 3516905100 BUTTON FUN CTION-A ABS XR -401 1 B04 3516906200 BUTTON FUN CTION-B ABS XR -401 1 B05 3513404600 KNOB VO LUM E ABS XR -401 1 B06 3516906300 BUTTON FUN CTION-C ABS XR-401 2 B07 PKBPM SP500 PCB SUB AS KOC-972T, K O C-982T 1 B08 7621301011 SC REW TAPPING T2S PAN 3x10 PW MFZ N 6 B09 PKMP M SQ300 PCB M AIN AS KOC-972T0S 1

PKMP M SQ300 PCB M AIN AS KOC-972T2S 1 PKMP M SQ350 PCB M AIN AS KOC-982T1S 1 PKMP M SQ350 PCB M AIN AS KOC-982T2S 1

B10 7621301011 SC REW TAPPING T2S PAN 3x10 PW MFZ N 3

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✔ Caution:

DISASSEMBLY AND ASSEMBLY

KOC-983T

(1) Remove a screw which secure the control panel assembly to

the oven front plate.

At the same time, draw forward the control panel assembly

from the oven front plate. (2) Remove ten screws which secure the main and

sub PCB assembly to control panel. (3) Remove buttons. (4) Remove the knob volume.

REF NO. PART CODE PART NAME DESCRIPTION QTY REMARK

B01 3516719220 CONTROL-PANEL ABS XR-401 1 B02 3511603120 DECORATOR C-PANEL PET T0.2 1 B03 3513405200 KNOB VOLUME ABS XR-401 1 B04 3516906300 BUTTON FUNCTION ABS XR-401 1 B05 PKBPMSYB00 PCB SUB AS KOC-984T 1 B06 7621301011 SCREW TAPPING T2S PAN 3X10 PW MFZN 6

KOC-983T1S KOC-983T2S

B07 PKMPMSYB00 PCB MAIN AS B08 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 4

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✔ Caution:

KOC-984T

(1) Remove a screw which secure the control panel assembly to

the oven front plate.

At the same time, draw forward the control panel assembly

from the oven front plate. (2) Remove the dial knob. (3) Remove ten screws which secure the main and

sub PCB assembly to control panel. (4) Remove buttons. (5) Remove the decorator panel.

D ISASSEMBLY AND ASSEMBLY

REF NO. PART CODE PART NAME DESCRIPTIO N QTY REM ARK

B01 3516719200 CONT RO L-PANEL A BS XR -401 1 B02 3511602900 D ECO R ATOR C/P *T STS304 T0.6 H/L 1 B03 3511603000 D ECO R ATOR C/P *U STS304 T0.6 H/L 1 B04 3511603110 DECOR ATOR C-PA NE L PMM A IF-850 1 SMOG B05 3511602800 DE CO RATOR RING ABS XR -401 1 COATING B06 3513404620 KNOB VO LUM E ABS XR -401 1 CO ATING B07 3516905120 BUTTON FUN CTION ABS XR-401 1 CO ATING B08 3516907200 BUTTON FUN CTION ABS XR-401 1 CO ATING B09 3516906320 BUTTON FUN CTION ABS XR-401 2 CO ATING B10 PKBPM SYB00 PCB SUB AS KOC-984T 1

B11 7621301011 SCRE W TAPPING T2S PAN 3x10 PW MFZN 6 B12 PKMPMSYB00 PCB MAIN AS B13 7122401211 SC REW TAPPING T2S TR S 4x12 MFZN 4

KOC-984T1S KOC-984T2S

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✔ Caution:

KOC-985T

(1) Remove a screw which secure the control panel assembly to

the oven front plate. At the same time, draw forward the control panel assembly

from the oven front plate. (2) Remove the dial knob. (3) Remove ten screws which secure the main and

sub PCB assembly to control panel.

(4) Remove buttons. (5) Remove the w indow display.

D ISASSEMBLY AND ASSEMBLY

REF NO. PART CODE PART NAME DESCRIPTIO N QTY REM ARK

B01 3516719210 CONT RO L-PANEL A BS XR -401 1 B02 3511603100 D ECO R ATOR C-PANEL STS304 T0.6 H/L 1 B03 3515501400 WINDO W DISPLAY PMM A IF-850 1 SMOG B04 3513404620 KNOB VO LUM E ABS XR -401 1 CO ATING B05 3516905120 BUTTON FUN CTION ABS XR-401 1 CO ATING B06 3516907200 BUTTON FUN CTION ABS XR-401 1 CO ATING B07 3516906320 BUTTON FUN CTION ABS XR-401 2 CO ATING B08 PKBPM SYB00 PCB SUB AS KOC-984T 1 B09 7621301011 SC REW TAPPING T2S PAN 3x10 PW MFZ N 6

B10 PKMPMSYB00 PCB MAIN AS

B11 7122401211 SCRE W TAPPING T2S TR S 4x12 MFZN 4

KOC-984T10S KOC-984T20S

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✔ Caution:

D ISASSE MBLY AN D A SSE M BLY

7. 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 steps for reassembly.

NOTE

After replacing the door assembly, perform a check of correct alignment with the hinge and cavity front plate.

8. To remove door parts

KOC-972T, KOC-98 2T

(1) Remove the gasket door. (4) Remove the barrier-screen *o. (2) Remove the door seal assy. (5) Remove two screws. (3) Remove the hook and spring. (6) Remove the handle from the frame door.

REF. NO. PART CODE P ART NAM E DESCRIPTION QTY REMARK

A01 3511708400 DO O R SE AL AS KO C-971C0S 1 A02 3513101100 HO O K PO M 1 A03 3515101300 SP RING H OO K PW1 1 A04 3517004030 BA RR IER-SCREEN *O TEMPER ED G LASS T3.2 1 A05 3512203360 FR AM E DO O R ABS XR -401 1 A06 3512601430 HA ND LE DO OR A BS XR -401 1 A07 3515203600 STOPPER HINGE *T AS KOC-970T1S 1 A08 3512300800 GASKET DOOR PBT 1 A09 7621301011 SC RE W TAPPING T2S PAN 3x10 M FZN 2

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✔ Caution:

D ISASSEMBLY AND ASSEMBLY

KOC-983T

(1) Remove the gasket door. (2) Remove the door seal ass’y. (3) Remove the hook and spring. (4) Remove the barrier-screen *o.

REF. NO. PART CODE P ART NAM E DESCRIPTION QTY REMARK

A01 3511708400 DO O R SE AL AS KO C-971C0S 1 A02 3513101100 HO O K PO M 1 A03 3515101300 SP RING H OO K PW1 1 A04 3517004030 BA RR IER-SCREEN *O TEMPER ED G LASS T3.2 1 A05 3512204010 FR AM E DO O R ABS XR -401 1 A06 3512300800 GASKET DOOR PBT 1 A07 3515203600 STOPPER HINGE *T AS KOC-970T1S 1

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✔ Caution:

KOC-984T, KOC-985T

(1) Remove the gasket door. (2) Remove a screw holding the handle. (3) Remove the handle from the frame door. (4) Remove the door seal ass’y. (5) Remove the hook and spring. (6) Remove the barrier-screen *o.

DISASSEMBLY AND ASSEMBLY

REF. NO. PART CODE PART NAME DESCRIPTION QTY REMARK

A01 3511708400 DOOR SEAL AS KOC-971C0S 1 A02 3513101100 HOOK POM 1 A03 3515101300 SPRING HOOK PW1 1 A04 3517004080 BARRIER-SCREEN *O TEMPERED GLASS T3.2 1 MIRROR A05 3512204000 FRAME DOOR ABS XR-401 1 A06 3511603200 DECORATOR DOOR *T STS304 T0.6 H/L 1 A07 3511603300 DECORATOR DOOR *U STS304 T0.6 H/L 1 A08 3515203600 STOPPER HINGE *T AS KOC-970T 1

A09

3512602400 HANDLE DOOR *T AS

3512602410 HANDLE DOOR *T AS A10 3512602300 HANDLE DOOR *U ABS XR-401 1 A11 7621300811 SCREW TAPPING T2S PAN 3x8 MFZN 1 A12 7122401211 SCREW TAPPING T2S TRS 4x12 MFZN 1 A13 3512300800 GASKET DOOR PBT 1

ABS XR-401 WOOD GRAIN ABS XR-401 SILVER COAT

1 KOC-984T 1 KOC-985T

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D ISASSE MBLY AN D A SSE M BLY

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

(1) To reduce gap located on part ‘A’

•

Loosen two screws on stopper hinge top, and then push

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

•

Tighten two screws.

(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.

(3) To reduce gap located on part ‘C’

•

Loosen a screw on interlock switch assembly

located bottom of oven body.

•

Draw the interlock switch assembly inward as possible to engage with hook on the door bottom.

•

Tighten a screw.

(4) To reduce gap located on part ‘D’

•

Loosen a screw on interlock switch assembly located top of oven body.

•

Following steps are same as step (3).

NOTE

Sm all gap may be acceptable if the microwave leakage does not exceed 1mW/cm2.

NOTE

The door on a microwave oven is designed to act as an electronic seal preventing the leakage of m icrowave energy from the oven cavity during the cook cycle. Th is function does not require that the door be air-tight, moisture (condensation) Tight or light-tight. Therefore, the occasional appearance of moisture, light or the sensing of gentle warm air movement around the oven door is not abnorm al and do not of them selves, indicate a leakage of microwave energy from the oven cavity. If such were the case, your oven could not be equipped w ith a bent, the very purpose of which is to exhaust the vapor-laden air from the oven cavity.

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D ISASSEMBLY AND ASSEMBLY

10. To remove motor syncro and under heater

(1) Cut the syncro motor cover parts from the base plate. (2) Remove two screws which secure the motor syncro and supporter to bracket syncro motor. (3) Remove two screws and under heater assembly in cavity

11. To remove grill heater assembly

KOC-972T

(1) Remove a nut which secure the heater holder inserting the wire of grill heater to side plate. (2) Remove two nuts and a screw which secure the heater bracket to grill heater. (3) Remove two heater brackets. (4) Pull the heater holder inward and then remove the grill heater. (5) Reverse the above steps for reassembly.



Page 23

D ISASSE MBLY AN D A SSE M BLY

KOC-982T,KOC-9 83T,KOC-984T,KOC-9 85T

(1) Remove two screws which secure the cover insulator *t to top plate. (2) Remove the harness between heaters. (3) Remove two screws for removing heater brackets. (4) Remove heaters. (5) Reverse the above steps for reassembly.

12. To remove convection part assembly (KOC-982T,KOC-983T,KOC-984T,KOC-985T only)

(1) Remove cover *b and cover insulator *b protecting convection part assembly. - release two lances of cover insulator *b. (2) Remove four screws which secure the convection part assembly to the cavity rear plate. (3) Remove a nut holding the convection fan and the pipe. (4) Remove two screws which secure the bracket motor to cover insulator. (5) Remove the cooling fan. (6) Remove two screws which secure the motor shaded pole to the bracket motor. (7) Reverse the above steps for reassembly.



Page 24

INTER L OCK MECHANISM AND ADJU STM E NT

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 microswitch. Then the button of the primary interlock switch bring it under “ON” condition.

2. Secondary interlock switch, door open monitor switch and interlock m onitor switch When the door is closed, the hook pushes the latch lever downward. The latch lever presses the button of the interlock monitor switch to bring it under “OFF” condition and presses the button of the secondary interlock switch and door open monitor switch to bring it under “ON” condition.

ADJUSTMENT

Interlock monitor switch

When the door is closed, the interlock monitor switch should be opened before other switches are closed. When the door is opened, the interlock monitor switch should be closed after other switches are opened.

3. Adjustment steps (1) Loosen two mounting screws. (2) Adjust interlock switch assembly position. (3) Make sure that latch lever moves smoothly after adjustment is completed. (4) Tighten completely two mounting screws.

NOTE

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

, readjust interlock mechanism.



Page 25

TROUBLE SHOOTING GUIDE

CONDITION

Continuity

0 infinite

Approx.

(normal)

Fuse again

Replace

Malfunction

of interlock

Shorted

contacts of

Defective

high voltage

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

1. Check grounding before checking trouble.

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 transform er, disconnect one lead wire from these parts and then check continuity with the AC plug removed. To do otherwise may result in a false reading or damage to your meter.

NOTE

W hen electric parts are checked, be sure the power cord is not inserted into the w all outlet. Check wire harness, wiring, and connected of the terminals and power cord before check parts listed below.

(TROUBLE 1)

Fuse b lows.

Oven does not operate at all; any inputs can not be accepted.

CHECK RESULT CAUSE REMEDY



Check continuity of

interlock m on itor switch

with door closed



(COM NC)

Check continuity of both

prim ary and secondary

interlock sw itch with

door closed

Check continuity of

primary interlock sw itch

contact with door

partially open until

interlock m on itor switch

contact close



(COM NC close)

(COM NC)

Continuity



(COM NC)

No C ontinuity

Continuity

of interlock

monitor

switch

prim ary

interlock

switch

NOTE 1

Check continuity of

prim ary winding of low

voltage transform er

Disconnect high voltage

fuse and operate the unit

Ω

150~210

blows



Defective low

voltage

transformer

Page 26

TROUBLE SHOOTING GUIDE

CONDITION

Defective

supply cord

Defective

Replace

Adjust

CONDITION

Malfunction

Defective

Faulty

contacts of

Defective

Adjust or

Replace

Continuity

0 V

CHECK RESULT CAUSE REMEDY

Outlet has proper voltage Fuse does not

blow.

Check continuity of

magn etron

Check continuity of noise

filter board

Check continuity of

power supply cord

Continuity

Normal

Defective

magn etron

noise filter board

Open pow er

touch control

circuit

NOTE

All these switches must be replaced at the same tim e, please refer to (7.Interlock Mechanism and Adjust) for adjustm ent instructions.

(TROUBLE 2)

Grill heater (top heater) is not heated; Food will not become hot.

Replace

Grill heater is

not heated.

CHECK RESULT CAUSE REMEDY

Check continuity of

primary interlock sw itch

Check continuity of

secondary interlock switch

Check continuity of

heater

Che ck D .C. voltage

being supplied to

RELAY (RY2) coil

Continuity

Approx

12 VDC

Malfunction

of primary

interlock switch

of secondary

interlock switch

heater

touch control

circuit

RELAY

(RY2) or open

relay coil

Replace



Page 27

TROUBLE SHOOTING GUIDE

CONDITION

Continuity

0 or

Continuity

0 V

Approx

12 VDC

Defective

high voltage

Defective

high voltage

Defective

magnetron

Defective

magnetron

Defective

high voltage

Defective

high voltage

Defective

Faulty

contacts of

Replace

Check continuity of high

(TROUBLE 3)

No microwave

oscillation

No microwave oscillation even though fan motor rotates.

CHECK RESULT

voltage fuse

Replace high voltage fuse

Continuity

voltage capacitor

term in a ls with wires

remove d

Continuity in

voltage rectifier in

forw ard and backward

direction w ith D C

megg er

Connect megger leads to

magn etron terminal and

magn etron body

backward

direction

CAUSE

transformer

rectifier

REMEDY

Check resistance of

prim ary and secondary

coil of high voltage

transformer

Check continuity of

magn etron w ith wires

remove d

Check continuity of

filament term inal of high

voltage transform er

Che ck D .C. voltage

being supplied to

RELAY (RY1) coil



Ω

transformer

touch control

circuit

RELAY

(RY1) or open

relay coil



Page 28

TROUBLE SHOOTING GUIDE

CONDITION

Adjust or

Replace

Malfunction

0 V

Approx.

Malfunction

Defective

Faulty

contacts of

CONDITION

Adjust or

Replace

Malfunction

0 V

Approx.

Malfunction

Defective

Faulty

contacts of

Replace

(TROUBLE 4)

Turn table

motor and

oven lamp do

not turn on

Display shows all figures selected, but oven does not start cooking, even though desired program and time are

set and start pad is tapped.

CHECK RESULT CAUSE REMEDY

Check continuity of

primary interlock switch

Check continuity of

secondary interlock and

D.O.M . switch

Che ck D .C. voltage

being supplied to

RELAY (RY3) coil

Continuity

12 VDC

of primary

interlock

switch

of secondary interlock and

D.O.M . switch

touch control

circuit

RELAY

(RY3) or open

relay coil

replace

(TROUBLE 5)

1) Under heater is not heated.

2) Convection fan and motor

do e s n o t ro t a te .

1) Under heater is not heated; Food will not become hot.

2) Convection motor does not rotate.

CHECK RESULT CAUSE REMEDY

Check continuity of

primary interlock switch

Check continuity of

secondary interlock switch

Check continuity of

heater (m otor)

Che ck D .C. voltage

being supplied to

RELAY (RY5) coil

Continuity

of primary

interlock

switch

of secondary

interlock switch

Defective

heater(m otor)

touch control

circuit

replace

12 VDC

RELAY

(RY5) or open

relay coil



Page 29

TROUBLE SHOOTING GUIDE

CONDITION

Replace

control box

sub-assembly

Replace

the button

Malfunction

(TROUBLE 6)

The following visual conditions indicate a probable defective touch control circuit or button P.C.B. assembly.

1. Incomplete segments (1) Segments missing (2) Partial segments missing (3) Digit flickering other than normal fluorescent 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. (for example, even if one touched 5, 3 appears in the display.

5. Specific numbers (for example, 2 or 3) do not display when the button is touched.

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

7. Oven is programable 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 when clear button is touched.

11. Oven lamp and turntable motor do not stop although cooking is finished. Check if the RELAY (RY3) contacts close and if they are close, replace touch control circuit.

CHECK RESULT CAUSE REMEDY

Display does

not show programm ing at all, even if

keyboard is

touched.

Check each button for

continuity of the button

keyboard for the

following keyboard

check procedure

Normal

of touch control circuit of control box

sub-assembly

Normal

of botton

keyboard

NOTE

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

keyboard



Page 30

BUTTON KE YBO ARD CH E CK PRO CED URE

1. Type of button names

TROUBLE SHOOTING GUIDE

(key metrix and circuit diagram)

The tact switch keyboard consists of 10 keys which configurations are described above.

2. Key check procedure To determine if the tact switch keyboard is defective or not, check the continuity of each button(key) contacts with a multimeter.

(1) PROGRAM COOK button : between 4 and 15 (2) TIME DEFROST button : between 8 and 14 (3) WEIGHT DEFROST button : between 8 and 14 (4) COMBI button : between 6 and 15 (5) GRILL button : between 8 and 12 (6) M/W button : between 8 and 15 (7) PIE button : between 8 and 10 (8) SPEEDY COOK button : between 6 and 10 (9) TEMP button : between 6 and 14 (10) START/CLOCK button : between 2 and 12 (11) STOP/CLEAR button : between 2 and 14



Page 31

ME ASUREME NT AND TEST

1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT

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

PROCE D URE

1. Microwave power output measurement is made wit 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). It 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.

Heating time is measured while the microwave generator is operating at full power. The filament heat-up 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 form ula:

P = 4187



•

• t is the heating time.

The power measured should be B (refer to Specifications)W ± 10.0 %.



T/t

T is difference between initial and ending temperature.

CAUTION

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

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

3. Ambient temperature should be 20 ± 2 °C (68 ± 3.6°F)

Heating time for power output:

(second) 7064605652494744424038

(W) 600 650 700 750 800 850 900 950 1000 1050 1100



Page 32

MEASUR E MENT AND TE ST

2. ELECTRICAL CONTINUITY CHECK OF INTERLOCK SWITCH

NOTE

Remove the power plug from the wall receptacle before testing.

PROCE DURE

1. Primary interlock switch

(1) Disconnect two connectors from primary interlock switch. (2) Connect the ohm-meter leads between the terminals of the primary interlock switch.

2. Read the value of resistance between the terminals of the switch, when the door is opened, and when the door is closed.

3. Secondary interlock switch

(1) Disconnect two connectors from secondary interlock switch. (2) Connect the ohm-meter leads between the terminals of the secondary interlock switch. (3) Read the value of resistance between the terminals of the switch, when the door is opened,

and when the door is closed.

3. Monitor interlock switch

(1) Disconnect the lead wire connecting the primary interlock switch and interlock monitor switch from

primary interlock switch terminal.

(2) Connect the ohm-meter leads between the lead wire connector disconnected as item1 and

the power supply neutral plug pin.

(3) Read the value of resistance between the lead wire connector and the power supply neutral plug pin,

when the oven door is opened, and when the oven door is closed.

JUDGEMENT

• The value of resistance should be applied to the value specified below.

Switch Door Open Door Close

Primary in terlock switch Secondary interlock switch Interlock monitor circuit 0

• When value obtained is not acceptable, the switch should be replaced or adjusted again.

 

0 0





Page 33

MEASUR E MENT AND TE ST

3. MICROWAVE RADIATION TEST

WARNING

Make sure to check the microwave leakage before and after repair of adjustm ent. Always start measuring of an unknow n field to assure safety for operating personnel from m icrow ave energy. Do not place your hands into any suspected microw ave radiation field unless the safe density level is known. Care should be taken not to place the eyes in direct line with the source of microw ave energy. Slowly approach the unit under test until the radiometer reads an appreciable m icrowave leakage from the unit under the test.

PROCE DURE

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 600 cc glass beaker with an inside diameter of approx. 95 mm(3.5 in.).

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.

• Measured radiation leakage must not exceed the value prescrib ed below. Leakage for a fully assembled oven with door normally

closed must be less than 4mW/cm

• When measuring the leakage, always use the 5 cm (2 in.) 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.

• 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 m o re slowly.

• 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.



Page 34

MEASUR E MENT AND TE ST

4. 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. 100 Filament winding ... Approx. 0.1 Primary winding ... Approx. 1.5



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 9M



once the capacitor is charged.

(3) A shorted capacitor will show continuous continuity. (4) An open capacitor will show constant 9M

(5) Resistance between each terminal and chassis should be infinite.

10%



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 k

in the other direction.

4. Magnetron

For complete magnetron diagnosis, refer to "Measurement of the Microwave Output Power." 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 0.1

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 35

WIRING DIAGR AM







Page 36

SC H EMATIC D IAGRAM











Page 37

SCHEMATIC DIAGRAM









Page 38

SCHEMATIC DIAGRAM





Page 39

E XP L ODE D VIEWS AND PARTS LIST

1. KOC-97 2T

EXPLODED VIEW



Page 40

✔ Caution:

EXPLODED VIEWS AND PARTS LIST

PARTS LIST

REF NO. PAR T CODE PART NAME DES CRIPTION QTY REMARK

A00 3511708320 DOO R A S KOC-972T 1

B00

F1 3516107900 CAVITY WELD A S KOC-971C 1 F2 3516503300 REAR -PLATE *O SBHG-1 TO.6 1 F3 3514800800 SENS O R TEM PE RATURE PTM-K312-D4 1 F4 7113400814 SCR EW TAPPING T1 BIN 4*8 MFNI 1 F5 3511403800 COV ER WAVE GUIDE M ICA TO.5 1 F6 7113400814 SCR EW TAPPING T1 BIN 4*8 MFNI 1 F7 3514400600 PIPE BRASS C3604BD 1 F8 3517401300 COU PLER CERA M IC 1 F9 3966510200 M OTOR SYNCRO 230V 25W GM -16-24FD24 1 F10 7121400811 S CRE W TAPPING T2S PAN 4*8 MFZN 2 F11 3510604000 BRAC KET M O TOR SY NCR O SE CC TO .8 1 F12 7113400814 S CRE W TAPPING T1 BIN 4*8 MFNI 1 F13 3512802100 HEATER *U AS KOC-971COS 1 F14 7113400814 S CRE W TAPPING T1 BIN 4*8 MFNI 2 F15 3510310400 BASE SBHG-1 T0.8 1 F16 3515202810 STOPPER HINGE *U AS KOC-970T 1 F17 7S422X4081 SCR EW SPECIAL TT2 TRS 4*8 SE MFZN 2 F18 3512100900 FOOT PP, DASF-130 4 F19 4416W67820 C APACITOR HV F20 441X304112 HOLDER HV CAPACITOR SECC TO.8 1 F21 7S422X4081 SCR E W SPECIAL TT2 TRS 4*8 SE MFZN 1 F22 4416V24000 DIODE HV SANKEN HV R-1X-32B(D5.3) 1 F23 3518112100 TRA NS HV D Y-90S0-97T1 1 F24 7S427W40A1 S CRE W SPECIAL TT2 HEX FG 4*10 SE MFZN 4 F25 7S312X40A1 SCRE W SPECIAL T1 TRS 4*10 SE MFZN 6 F26 3513809100 LOCK POM 1 F27 3513601600 LAMP BL 240V25W T25 C7A H187 1 F28 5S762S10G0 SW M ICRO SZM-V16-FA-63 2 F29 5S762310G0 SW M ICRO SZM-V16-FA-61 2 F30 3513701300 LEVER LOC K PO M 1 F31 7S341W40B1 S CRE W SPECIAL T2S PAN 4*12 PW SE MFZN 2 F32 7S341W40B1 S CR E W SPECIAL T2S PAN 4*12 PW SE MFZN 1 F33 7S422X4081 SCR E W SPECIAL TT2 TRS 4*8 SE MFZN 1 F34 3512801900 HEATER *T 230V 1100W R28370001 1

PKCPSWQ 300 CON TR OL-PANEL AS K O C-972T0S 1 PKCPSWQ 300 CON TR OL-PANEL AS K O C-972T2S 1

2100VA C, 1.1UF



Page 41

✔ Caution:

EXPLODED VIEW S AND PARTS LIST

REF NO. PAR T CODE PART NAME DES CRIPTION QTY REMARK

F35 3513002900 HOLDE R HE ATEER BRAS S C 3604BD 1 F36 7391800011 N UT H EX 6N-1-8 MFZN 1 F37 3510603700 BRACK ET HE ATER *U STS301 TO.6 1 F38 3510603600 BRACK ET HE ATER *T STS430 T1.O 1 F39 7391400008 NUT 6N -1-4 SUS 2 F40 3518002400 MAGN ETR ON 2M 218J(MF)I 1 F41 7S427W40A1 S CRE W SPECIAL TT2 HEX FG 4*10 SE MFZN 3 F42 3511800100 FAN PP GF20 1 F43 3512505200 GUIDE WIND PP 1 F44 3963513000 MOTOR SHA DE D PO LE 230V25W OEM -15DW C 2-A03 1 F45 7121403011 S CRE W TAPPING T2S PAN 4*30 MFZN 2 F46 7S341W40B1 S CRE W SPECIAL T2S PAN 4*12 PW SE MFZN 1

F47

F48

F49 7S312X40A1 SCRE W SPECIAL T1 TRS 4*10 SE MFZN 1

F50

F51 7S312X40A1 SCRE W SPECIAL T1 TRS 4*10 SE MFZN 2 F52 7S427W40A1 S CR E W SPECIAL TT2 HEX FG 4*10 SE MFZN 2 F53 3512505500 GUIDE AIR OUTLET SA1D-80 TO.5 1 F54 7S312X40A1 SCRE W SPECIAL T1 TRS 4*10 SE MFZN 1 F55 3511401200 C OVE R INSULATOR *T SEC C TO .5 1 F56 7S312X40A1 SCRE W SPECIAL T1 TRS 4*10 SE MFZN 1 F57 3510801900 CABINET PC M TO .5 1 F58 7S312X40A1 SCRE W SPECIAL T1 TRS 4*10 SE MFZN 4 F59 3512513000 GUIDE TRAY AS KO C-971COS 1 F60 3517205200 TRAY METAL S PP TO .6 1 F61 3518700220 FUSE HV 5KV 0.7A THVO60T 1

3518604600 NOISE-FILTER DW LF-P(KOC-972TOS) 1 3518605500 NOISE-FILTER DW LF-M O7(KO C-972T2S) 1 4417B67600 FUSE 15A 250V 1 5F1CD1232M FUSE 12A 250V 1

35113A5Q 5J CORD PO W ER A S 3*1.5(KO C-972T0S) 1 35113A5Q M 5 CORD PO W E R AS 3*1.0(KO C-972T2S) 1



Page 42

2. KOC-98 2T/ 983T /98 4T/ 98 5T

EXPLODED VIEW

EXPLOD E D VIEW S AN D P A R TS LIST



Page 43

✔ Caution:

EXPLODED VIEWS AND PARTS LIST

PARTS LIST

REF NO. PART CODE PART NAME DESCRIPTION QTY REMARK

A00 3511708380 DOOR AS KOC-984T 1

3511708390 DOOR AS KOC-985T 1 3511710830 DOOR AS KOC-983T 1 3511708320 DOOR AS KOC-982T 1

B00 PKCPSWYB00 CONTROL-PANEL AS KOC-984T(SIMULTANEOUS) 1

PKCPSWYC00 CONTROL-PANEL AS KOC-985T(SIMULTANEOUS) 1 PKCPSWYE00 CONTROL-PANEL AS KOC-983T(SIMULTANEOUS) 1 PKCPSWQ350 CONTROL-PANEL AS KOC-982T(SIMULTANEOUS) 1 PKCPSWYB00 CONTROL-PANEL AS KOC-984T(SEQUENTIAL) 1 PKCPSWYC00 CONTROL-PANEL AS KOC-985T(SEQUENTIAL) 1 PKCPSWYE00 CONTROL-PANEL AS KOC-983T(SEQUENTIAL) 1

PKCPSWQ350 CONTROL-PANEL AS KOC-982T(SEQUENTIAL) 1 F01 3516107950 CAVITY WELD AS KOC-980T1S 1 F02 3518904400 THERMOSTAT 120/60, #187 1 F03 7121400611 SCREW TAPPING T2S PAN 4*6 MFZN 1 F04 7112400811 SCREW TAPPING T1 TRS 4X8 MFZN 1 F05 3511403800 COVER WAVE GUIDE MICA TO.5 1 F06 7113400814 SCREW TAPPING T1 BIN 4*8 MFNI 1 F07 3514400600 PIPE BRASS C3604BD 1 F08 3517401300 COUPLER CERAMIC 1 F09 3966510200 MOTOR SYNCRO 230V 25W GM-16-24FD24) 1 F10 7121400811 SCREW TAPPING T2S PAN 4*8 MFZN 2 F11 3510604000 BRACKET MOTOR SYNCRO SECC TO.8 1 F12 7113400814 SCREW TAPPING T1 BIN 4*8 MFNI 1 F13 3512802100 HEATER *U AS KOC-971COS 1 F14 7113400814 SCREW TAPPING T1 BIN 4*8 MFNI 2 F15 3510310400 BASE SBHG TO.8 1 F16 3515202800 STOPPER HINGE *U AS KOR-121MOA 1 F17 7S422X4081 SCREW SPECIAL TT2 TRS 4*8 SE MFZN 2 F18 3512101400 FOOT PP, DASF-130 4 F19 4416W67820 CAPACITOR HV F20 441X304112 HOLDER HV CAPACITOR SECC TO.8 1 F21 7S422X4081 SCREW SPECIAL TT2 TRS 4*8 SE MFZN 1 F22 4416V24000 DIODE HV SANKEN HVR-1X-32B(D5.3) 1 F23 3518112100 TRANS HV DY-N90S0-97T1 1 F24 7S427W40A1 SCREW SPECIAL TT2 HEX FG 4*10 SE MFZN 4 F25 7S312X40A1 SCREW SPECIAL T1 TRS 4*10 SE MFZN 5 F26 3513809100 LOCK POM 1 F27 3513601600 LAMP BL 240V 25W T25 C7A H187 1 F28 5S762S10G0 SW MICRO SZM-V16-FA-63 2 F29 5S762310G0 SW MICRO SZM-V16-FA-61 2 F30 3513701300 LEVER LOCK POM 1 F31 7122401211 SCREW TAPPING T2S TRS 4*12 MFZN 2 F32 7122401211 SCREW TAPPING T2S TRS 4*12 MFZN 1

2100VAC, 1.1UF

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✔ Caution:

EXPLODED VIEWS AND PARTS LIST

REF NO. PART CODE PART NAME DESCRIPTION QTY REMARK

F33 7S422X4081 SCRE W SPECIAL TT2 TRS 4*8 SE MFZN 1 F34 3517502700 P RO TECTO R H EATER MICA MT 56 T1.O 2 F35 3510603610 B RAC KET H EATER *T SECC TO .6 2 F36 7S312X40A1 SCREW SPECIAL T1 TRS 4*10 SE MFZN 2 F37 3512803000 H EATER MIRAC LON 115V 550W 2 F38 3512765100 H ARN ESS HE ATER #187 FLAG 65MM 1 F39 3517302500 F OA M CR 10T*180*30 1 F40 3518002400 MAG N E TRON 2M218J(MF)I 1 F41 7S427W40A1 SCRE W SPECIAL TT2 HEX FG 4*10 SE M FZN 3 F42 3511800100 FAN PP GF20 1 F43 3512505200 G UIDE W IND P P 1 F44 3963513000 M O TOR SHAD ED PO LE F45 7112403011 SCR EW TAPPING T 2S PAN 4*30 MFZN 2 F46 7122401211 SCREW TAPPING T 2S TRS 4*12 MFZN 1

F47

F48 F49 7112401011 SCR EW TAPPING T 1 TRS 4*10 MFZN 1

F50 F51 7112401011 SCR EW TAPPING T 1 TRS 4*10 MFZN 2

F52 7S427W40A1 SCRE W SPECIAL TT2 HEX FG 4*10 SE MFZN 2 F53 3512505500 G UIDE AIR OU TLET S A1D-80 TO.5 1 F54 7112401011 SCR EW TAPPING T 1 TRS 4*10 MFZN 1 F55 3511404800 COVER INSULATOR *T SECC TO .5 1 F56 7112401011 SCR EW TAPPING T 1 TRS 4*10 MFZN 1 F57 3510801000 C ABINET P CM TO.5 1 F58 7112401011 SCR EW TAPPING T 1 TRS 4*10 MFZN 4 F59 3512513000 G UIDE TRAY AS KOC-971COS 1 F60 3517205200 T RAY METAL SPP TO.6 1 F61 3514800800 S ENS OR T EM PER ATURE PTM-K312-D4 1 F62 7113400814 SCREW TAPPING T1 BIN 4*8 MFNI 1 F63 3518700220 F USE H V 5K V 0.7A 1 F64 3511401300 COVER INSULATOR *B SBHG-1 0.6T 1 F65 3510601500 B RAC KET M O TOR SBHG -1 0.8T 1 F66 3963513200 M O TOR SHAD ED PO LE O EM -10DWC 2-A09 1 F67 7051400811 SCREW M AC HINE PAN 4*8 SW MFZ N 2 F68 441B629071 FAN SBHG -1 0.6T 1 F69 3514400400 P IPE AL1100 1 F70 3511401800 COVER INSULATOR S A1D-80 0.7T 1 F71 3511800400 FAN CO NVE CTION SA1D-80 0.5T 1 F72 7121400811 SCREW SPECIAL N UT FLANGE M4 MFZN 1 F73 7S627W50X1 SCRE W TAPPING T1 TR S 4*8 TB-W M FZN 1 F74 7S627W50X1 SCRE W TAPPING T1 TR S 4*8 TB-W M FZN 4 F75 3511402100 COVER *B P.P 1

3518604600 N OISE-FILTER DW LF-P(SIMULTAN EOU S) 1

3518605500 N OISE-FILTER DW LF-M O7(SEQU EN TIAL) 1

4417B67600 FUSE 15A 250V(SIMULTANEO U S) 1

5F1CD1232M FUSE 12A 250V(SEQ UEN TIAL) 1

35113A5Q 5J C OR D PO W E R AS 3*1.5(SIMULTA NEO U S) 1

35113A5Q M 5 C OR D PO W E R AS 3*1.0(SIMULTA NEO U S) 1

230V 25W OEM-15DWC2-AO3

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P RINTED WIRING 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) : 230 VA C / 50 Hz

•

KOC-972T/982T KOC-983T/984T/985T

L.V.T. : DMR -101FS L.V.T. : DMR-984FS

Terminal Voltage Term inal Voltage 1 - 2 230VAC/50Hz 1 - 3 230VAC/50Hz 4 - 5 13.0 VAC 6 - 7 10.5 VAC 6 - 7 35.0 VAC 7 - 8 10.5 VAC 8 - 10 3.0 VAC 9 - 10 2.6 VAC

Secondary side voltage of the low voltage transformer changes in proportion to fluctuation of power source voltage. The allowable tolerance of the secondary voltage is within ± 5% of normal voltage.

Voltage check

• Key check point ( 1~5:Micom Pin, 6:Display Pin )

NO CHECK POINT REMARK

1 P IN 6 3 , 6 4 +5 V DC ± 5% 2 P IN 2 9 , 3 2 , 62 0 V 3 P IN 2 8 + 5 VD C 4 P IN 4 5

5 P IN 3 0 , 3 1

6 P IN 1, 25 2.6 VAC (Display filament voltage)

• Check method

NO VOLTAGE

KOC -982T KOC-983T/984T/985T

1 +5 V DC Replace Q3,ZD2,R25,C12 Replace Q3,ZD3,R26,C 10 2 +12 V DC R eplace D2~D5,EC3,C 11 R eplace D7,D8,EC2,EC3,C14,C11 3 -24 VDC Replace D6,EC4,R28,R 29,ZD4 Replace D9,D10,EC4,EC5,C15

REMARK

NOTE

The marks of the above corresponding voltages (+5, +12, -24VDC) are written on the PCB . Each measuring points must be measured with G N D points.

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PR INTED WIRING BOARD

3. Display Problems

NO CAUSE M EASUREMENT RESULT REMEDY

1 P oor contact between

P.C.B. and display filament

2 T he display has some

trouble in its segment or grid

3 Loss vacuum in the

display

Check the voltage of display pin 1 & 252.6 VAC Fix the pin 1 &

25 on the P.C.B.

Refer to The display trouble shooting data below

Find white spot Replace P.C .B.

Replace P.C .B. assembly

assembly

• The display trouble shooting data

TROUBLE DISPLAY NAME & PIN NO. MICOM OUTPUT IN PIN NO.

Grid 1 doesn’t come on. Grid 1 (G 1), 4, 7 13 Grid 2 doesn’t come on. Grid 2 (G 2), 10 16 Grid 3 doesn’t come on. Grid 3 (G 3), 14 18 Grid 4 doesn’t come on. Grid 4 (G 4), 17 17 Grid 5 doesn’t come on. Grid 5 (G 5), 21 24 Segment a doesn’t come on from G1 to G5 Segment a, 23 26 Segment b doesn’t come on from G1 to G5 Segment b, 22 25 Segment c doesn’t come on from G 1 to G5 S egm ent c, 20 23 Segment d doesn’t come on from G1 to G5 Segment d, 19 22 Segment e doesn’t come on from G1 to G5 Segment e, 18 21 Segment f doesn’t come on from G1 to G5 Segm ent f, 16 20 Segment g doesn’t come on from G1 to G5 Segment g, 15 19 Segment h doesn’t come on from G1 to G5 Lower bar h, 5 14 Segment i doesn’t com e on from G1 to G5 Upper bar i, 6,8,9,11 15

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4. Case of no microwave oscillation

(1) Situation : When touching M/W button, oven lamp turns on, fan motor and turntable motor rotate and cook

indicator in the display comes on.

• CAUSE : Relay 1 (RY1) does not operate.

KOC-972T/982T KOC-983T/984T/985T

• Check method

STAGE POINT A POINT B

RELAY ON +5 VDC GND RELAY OFF GND +12 VDC

(2) Situation : When touching M/W button, oven lamp does not turn on and turntable motor does not rotate but cook

indicator in the display comes on.

• CAUSE : Relay 4 (RY4) does not operate.(KOC-972T/982T) Relay 3 (RY3) does not operate.(KOC-983T/984T/985T)

KOC -972T/982T KOC -983T/984T/985T

• Check method

STAGE POINT A POINT B

RELAY ON +5 VDC GND RELAY OFF GND +12 VDC

(3) Situation : When touching M/W button, oven lamp turns on and fan motor does not rotate but cook

indicator in the display comes on.

• CAUSE : Relay 5 (RY5) does not operate.(KOC-972T/982T) Relay 4 (RY4) does not operate.(KOC-983T/984T/985T)

KOC-972T/982T KOC-983T/984T/985T

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PR INTED WIRING BOARD

• Check method

STAGE POINT A POINT B

RELAY O N +5 VDC GND RELAY OFF G ND +12 VD C

5. Case of no heating of upper heater

When touching TEMP COOK & COMBI button, oven lamp turns on, fan motor and turntable motor rotate and cook indicator in the display comes on.

• CAUSE : Relay 2 (RY2) does not operate.

KOC-972T/982T KOC-983T/984T/985T

• Check method

STAGE POINT A POINT B

RELAY O N +5 VDC GND RELAY OFF G ND +12 VD C

6. Case of no heating of lower heater

When touching TEMP COOK & PIE button, oven lamp turns on, fan motor and turntable motor rotate and cook indicator in the display comes on.

• CAUSE : Relay 6 (RY6) does not operate.(KOC-972T/982T) Relay 5 (RY5) does not operate.(KOC-983T/984T/985T)

KOC-972T/982T KOC-983T/984T/985T

• Check method

STAGE POINT A POINT B

RELAY ON +5 VDC GND RELAY OFF GND +12 VDC

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PRINTED WIRING BOARD

7. Case of no stopping of the count down timer

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

KOC -972T/982T KOC -983T/984T/985T

• Check method

STAGE POINT A POINT B

Door opened O pen +5 VDC Door closed Closed GND

NOTE

Check the state (ON, OFF) of the secondary interlock switch by resistance measurement.

8. Case of appearring Err6 on the display

KOC -972T/982T KOC-983T/984T/985T

• Check method

POINT WAVEFORM

NOTE

If clock does not keep exact time, you m ust check Diode D1 & Transistor Q2 (KO C-972T/982T), Diode D1 & Transistor Q1(KOC -984T/985T).

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P.C.B. CIRCUIT DIAGRAM

1. KOC-972T/982T

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✔ Caution:

P.C.B. CIRCUIT DIAGRAM

KOC-972T/982T PCB ASS’Y PART LIST

NAME SYMBOL SPECIFCATION PART CODE Q′TY

PCB TRANS POWER LVT1 DMR-101FS 5EPV041351 1

HOLDER VFD HD1 PP KOR-9930 3513002000 1 BUZZER BZ1 BM-20K 3515600100 1 DIGITRON DP1 SVM-5SS13 DSVM5SS13- 1 RESONATOR CERA CR1 CST4.00MGW 5PCST400MG 1

IC MICOM IC1 R CARBON FILM R25 1/4W, 1K OHM J RD-4Z102J- 1

R CARBON FILM R28.29 1/4W, 2K OHM J RD-4Z202J- 2 R CARBON FILM R27 1/4W,6.8 OHM J RD-4Z689J- 1 R CARBON FILM RO,4~6,14~16,21 1/6W,100K OHM J RD-AZ104J- 8 R CARBON FILM R7,9~11 1/6W,4.7K OHM J RD-AZ472J- 4 R CARBON FILM R3,8,17,18 1/6W,10K OHM J RD-AJ103J- 4 R CARBON FILM R2,13,19,20,26 1/6W,1K OHM J RD-AZ102J- 5 R CARBON FILM R23 1/6W,510 OHM J RN-AZ510J- 1 R CARBON FILM R12 1/6W,330 OHM J RD-AZ331J- 1 R CARBON FILM R1 1/6W,100 OHM J RD-AZ101J- 1 R CARBON FILM R22 1/4W,120K OHM F RN-4Z1203F 1 R CARBON FILM R24 1/4W,10K OHM F RN-4Z1002F 1 R CARBON FILM R31 1/4W, 68 OHMJ 982T RD-4Z680J- 1 DIODE SWITCHING D1 1N4148M DZN4148M- 1 DIODE ZENER D2~8,10,11 1N4002A DZN4002A-- 9 DIODE ZENER ZD1 MTZ 3.9B DZUZ3R9BSB 1 DIODE ZENER ZD2 UZ 5.6B DZUZ5R6BSB 1 DIODE ZENER ZD3 MTZ 4.7B DZUZ4R7BSB 1 DIODE ZENER ZD4 MTZ 24B DZUZ24BSB- 1 C ELECTRO EC1 RS 50V 10UF CEXE1H100A 1 C ELECTRO EC3 RSS 25V 2200UF CEXF1V102V 1 C ELECTRO EC4 RSS 50V 470UF CEXF1H471V 1 C ARRAY CA1 8P(7)50V 1000PF CN7XB-102M 1 C CERA AXIAL C1,2,5~7,11,12 H1KF 50V 0.1uFZ CCKF1H104Z 7 C CERA AXIAL C8~10 H1KF 50V 1000pF CCZB1H102K 3 C CERA AXIAL C3,4 H1KF 50V 0.47uF CCKF1H473Z 2 CONNECTOR WAFER CN1 35312-0310 30166M5030 1 CONNECTOR WAFER CN2 35313-0210 30166M7020 1 CONNECTOR WAFER CN4 35328-0610 4CW3061MX0 1 CONNECTOR FILM CN3 HLEM15S-1 4CW215SBD0 1 TRANSISTOR Q1 KTA1270Y TZTA1270Y- 1 TRANSISTOR Q2,3 KTC3198GR TZTC3198GR 2 TRANSISTOR Q4~6,8,9 KRC102M TZRC102M- 5

RELAY RY1,RY2 RELAY RY4,RY5,RY6 G5B-1-12V 5SC0101110 2

R ARRAY RA1~RA3 8P (7) 1/8 100KJ RA-88X104J 3 CONNECTOR FILM CN101 HLEM15R-1 4CW21RBD0 1 SW TACT SW101~108,110,111 KPT-1115AM 5S50101Z93 10

SW ROTARY SW109

M212 93X197 3514314940 1 M213 84X192 3514314950 1

MB89143AP-171,972T 141SC871C0 1 MB89144AP-249,982T 141SC981C0 1

G5J-1-TP-M-DT-12 972T 5SC0101112 2 G5G-1A-DT DC12V 982T 5SC0101123 2

SDB161VB17F-12-36-36PC(PITCH5)

5S10109002 1

Page 52

KOC-983T/984T/985T

P.C.B. CIRCUIT DIAGRAM

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Page 53

✔ Caution:

P.C.B. CIRCUIT DIAGRAM

KOC-983T/984T/ 985T PCB AS S’Y PART LIS T

NAME SYMBOL SPECIFCATION PART CODE Q

PCB

M218 93X213 3514314980 1

M219 91.5X163 3514314990 1 BUZZER BZ1 BM-20K 3515600100 1 CONNECTOR WAFER CN1 35312-0310 30166M5030 1 CONNECTOR WAFER CN2 35313-0210 30166M7020 1 CONNECTOR WAFER CN3 515 80-15 4CW215SBD0 1 CONNECTOR WAFER CN4 35328-0610 4CW3061MX0 1 CONNECTOR WAFER CN101 515 81-15 4CW215RBD0 1 DIGITRON DP1 SVM-5SS13 DSVM5SS13- 1 HOLDER VFD DPH PP KOR -9930 3513002000 1 IC MICOM IC1 MB89143AP-241 141SC984T0 1 TRANS POWER LVT1 DMR-984FS 5EPV041305 1 SW RELAY RY1,RY2 G5G-1A-DT DC 12V 5SC0101123 2 SW RELAY RY3.RY4,RY5 G5B-1 DC 12V 5SC0101110 3 RESONATOR CERA CR1 KBR-4.0MKSTF 5PKBR40MKS 1

C ELECTRO EC1 RS 50 V 10 C ELECTRO EC2,EC3 RSS 35V 1000 C ELECTRO EC4,EC5 RSS 50V 220

F CEXE1H100A 1

F CEXF1V102V 2

F CEXF1H221V 2 TRANSISTOR Q1,Q3 K TC3198GR TZTC3198GR- 2 TRANSISTOR Q2 KTA1270Y TZTA1270Y- 1 TRANSISTOR Q4---Q9 KRC106M TZRC106M-- 6

C CERA AXIAL C1,C8-C15 H1KF 50V 0.1 C CERA AXIAL C6,C7 H1KF 50V 0.047 C CERA AXIAL C2-C5 H1K F 50V 1000 C ARRAY CA1 8P(7) 50V 1000

F Z CCZF1H104Z 9

F Z CCZF1H473Z 2

F K CCZF1H102Z 4

F CN7XB-102M 1 DIODE SWITCHING D1 1N4148M DZN4148M-- 1 DIODE SWITCHING D2-D10 1N4004A DZN4004A -- 9 R CARBON FILM R1-R4,R12,R14,R24 1/6W, 100K OHM J RD-AZ104J- 7 R CARBON FILM R5,R9,R 11,R20,R27 1/6W, 1K OHM J RD-AZ102J- 5 R CARBON FILM R6 1/4W, 120K OHM F RN-4Z1203F 1 R CARBON FILM R7 1/4W, 10K OHM F RN-4Z1002F 1 R CARBON FILM R8,R10,R 2 1 1/6W, 10K OHM J RD-AZ103J- 3 R CARBON FILM R13,R15-R1 7,R22,R28 1/6W, 4.7K OHM J RD-AZ472J- 6 R CARBON FILM R18 1/6W, 510 OHM J RD-AZ511J- 1 R CARBON FILM R19 1/6W, 200 OHM J RD-AZ201J- 1 R CARBON FILM R23 1/6W, 330 OHM J RD-AZ331J- 1 R CARBON FILM R26 1/4W, 1,2K OHM J RD-4Z122J- 1 R ARRAY RA1,RA2,RA3 8P(7) 1/8 100K J RA-88X104J 3 DIODE ZENER ZD1 MTZ J 4.7B DZUZ4R7BSB 1 DIODE ZENER ZD2 MTZ J 3.9B DZUZ3R9BSB 1 DIODE ZENER Z D3 MTZ J 5.6B DZUZ5R6BSB 1

SW ROTARY SW109

SDB161PVB17F-1-2

-36-36PC(PITCH 5)

5S10109002 1

WIRE FLAT WF1 1.25X15X90XC WSJ-159007 1 SW TACT

SW101-SW108

SW110,SW111

SKHV10910A 5S50101Z90 10

′′′′

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Daewoo KOC-984TB Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

SAFETY AND PRE CAUTIONS

1. FOR SAFE OPERATION

2. FOR SAFE SERVICE PROCEDURES

SPECIFICATIONS

EXTERNAL VIEW

1. OUTER DIMENSION

2. FEATURE DIAGRAM

INSTALLATION

EARTHING INSTRUCTIONS

C ONTROL PANEL

DISASSEMBLY AND ASSEMBLY

1. To remove cabinet

2. To remove guide wind assembly

3. To remove H.V.transformer

4. To remove high voltage capacitor

5. To remove magnetron

6. To remove control panel assembly

7. To remove door assembly

8. To remove door parts

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

10. To remove motor syncro and under heater

11. To remove grill heater assembly

12. To remove convection part assembly (KOC-982T,KOC-983T,KOC-984T,KOC-985T only)

INTER L OCK MECHANISM AND ADJU STM E NT

TROUBLE SHOOTING GUIDE

ME ASUREME NT AND TEST

1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT

2. ELECTRICAL CONTINUITY CHECK OF INTERLOCK SWITCH

3. MICROWAVE RADIATION TEST

4. COMPONENT TEST PROCEDURE

WIRING DIAGR AM

SC H EMATIC D IAGRAM

E XP L ODE D VIEWS AND PARTS LIST

1. KOC-97 2T

2. KOC-98 2T/ 983T /98 4T/ 98 5T

P RINTED WIRING BO ARD

1. CIRCUIT CHECK PROCEDURE