Toshiba 20AF44 Schematic

FILE NO. 050-200405

DOCUMENT CREATED IN JAPAN, Mar., 2004

SERVICE MANUAL

COLOR TELEVISION

20AF44

SERVICING NOTICES ON CHECKING

As for the places which need special attentions, they are indicated with the labels or seals on the cabinet, chassis and parts. Make sure to keep the indications and notices in the operation manual.

2. AVOID AN ELECTRIC SHOCK

There is a high voltage part inside. Avoid an electric shock while the electric current is flowing.

3. USE THE DESIGNATED PARTS

The parts in this equipment have the specific characters of incombustibility and withstand voltage for safety. Therefore, the part which is replaced should be used the part which has the same character. Especially as to the important parts for safety which is indicated in the circuit diagram or the table of parts as a mark, the designated parts must be used.

4. PUT PARTS AND WIRES IN THE ORIGINAL POSITION AFTER ASSEMBLING OR WIRING

There are parts which use the insulation material such as a tube or tape for safety, or which are assembled in the condition that these do not contact with the printed board. The inside wiring is designed not to get closer to the pyrogenic parts and high voltage parts. Therefore, put these parts in the original positions.

5. TAKE CARE TO DEAL WITH THE

CATHODE-RAY TUBE

In the condition that an explosion-proof cathoderay tube is set in this equipment, safety is secured against implosion. However, when removing it or serving from backward, it is dangerous to give a shock. Take enough care to deal with it.

6. AVOID AN X-RAY1. KEEP THE NOTICES

Safety is secured against an X-ray by considering about the cathode-ray tube and the high voltage peripheral circuit, etc. Therefore, when repairing the high voltage peripheral circuit, use the designated parts and make sure not modify the circuit. Repairing except indicates causes rising of high voltage, and it emits an X-ray from the cathoderay tube.

7. PERFORM A SAFETY CHECK AFTER SERVICING

Confirm that the screws, parts and wiring which were removed in order to service are put in the original positions, or whether there are the portions which are deteriorated around the serviced places serviced or not. Check the insulation between the antenna terminal or external metal and the AC cord plug blades. And be sure the safety of that.

(INSULATION CHECK PROCEDURE)

Unplug the plug from the AC outlet.

Remove the antenna terminal on TV and turn on the TV.

Insulation resistance between the cord plug terminals and the eternal exposure metal [Note 2] should be more than 1M ohm by using the 500V insulation resistance meter [Note 1].

If the insulation resistance is less than 1M ohm, the inspection repair should be required.

[Note 1]

If you have not the 500V insulation resistance meter, use a Tester.

[Note 2]

External exposure metal: Antenna terminal

Headphone jack

HOW TO ORDER PARTS

Please include the following informations when you order parts. (Particularly the VERSION LETTER.)

1. MODEL NUMBER and VERSION LETTER The MODEL NUMBER can be found on the back of each product and the VERSION LETTER can be

found at the end of the SERIAL NUMBER.

2. PART NO. and DESCRIPTION You can find it in your SERVICE MANUAL.

IMPORTANT

Inferior silicon grease can damage IC's and transistors. When replacing an IC's or transistors, use only specified silicon grease (YG6260M). Remove all old silicon before applying new silicon.

Licensed by BBE Sound, Inc. under USP4638258, 5510752 and

5736897. BBE and BBE symbol are registered trademarks of BBE Sound, Inc.

A1-1

TABLE OF CONTENTS

SERVICING NOTICES ON CHECKING.....................................................................................

HOW TO ORDER PARTS ..........................................................................................................

IMPORTANT ...............................................................................................................................

TABLE OF CONTENTS..............................................................................................................

GENERAL SPECIFICATIONS ...................................................................................................

DISASSEMBLY INSTRUCTIONS

1. REMOVAL OF ANODE CAP ...............................................................................................

2. REMOVAL AND INSTALLATION OF FLAT PACKAGE IC ................................................

SERVICE MODE LIST ................................................................................................................

CONFIRMATION OF HOURS USED .........................................................................................

WHEN REPLACING EEPROM (MEMORY) IC ..........................................................................

ELECTRICAL ADJUSTMENTS..................................................................................................

BLOCK DIAGRAM......................................................................................................................

PRINTED CIRCUIT BOARDS

MAIN ........................................................................................................................................

CRT/VM COIL..........................................................................................................................

SCHEMATIC DIAGRAMS

MICON .....................................................................................................................................

CHROMA .................................................................................................................................

DEFLECTION ..........................................................................................................................

POWER ...................................................................................................................................

SOUND ....................................................................................................................................

TUNER/STEREO.....................................................................................................................

AV ............................................................................................................................................

COMB/FILTER.........................................................................................................................

CRT/SVM.................................................................................................................................

WAVEFORMS .............................................................................................................................

MECHANICAL EXPLODED VIEWS...........................................................................................

MECHANICAL REPLACEMENT PARTS LIST .........................................................................

ELECTRICAL REPLACEMENT PARTS LIST...........................................................................

A1-1 A1-1 A1-1 A2-1 A3-1~A3-5

B1-1 B2-1, B2-2 C1-1 C1-1 C1-1 D-1~D-5 E-1, E-2

F-1~F-4 F-5

G-1, G-2 G-3, G-4 G-5, G-6 G-7, G-8 G-9, G-10 G-11, G-12 G-13, G-14 G-15, G-16 G-17, G-18 H-1, H-2 I-1, I-2 J1-1 J2-1~J2-5

A2-1

GENERAL SPECIFICATIONS

G-1 TV CRT CRT Size / Visual Size 20 inch / 508mmV

G-2 Tuning Broadcasting System US System M

G-3 Power Power Source AC 120V AC 60Hz

G-4 Regulation Safety UL/CSA

G-5 Temperature Operation +5oC ~ +40oC

G-6 Operating Humidity Less than 80% RH

System CRT Type Flat

Color System NTSC Speaker 2 Speaker

Sound Output MAX

NTSC3.58+4.43 /PAL60Hz No

System Tuner and System 1Tuner

Receive CH Destination USA(W/ CATV)

Intermediate Picture(FP) 45.75MHz Frequency Sound(FS) 41.25MHz

Preset CH Stereo/Dual TV Sound Yes Tuner Sound Muting Yes

Power Consumption at AC

Protector Power Fuse Yes

Deflection Magnetic Field BV/BH +0.45G/0.18G

Position Front Side Size 2 x 4.7 Inch Impedance 8 ohm

10%(Typical)

Tuning System F-Synth Input Impedance VHF/UHF 75 ohm

CH Coverage A - I, J - W, W+1 - W+84

FP-FS 4.50MHz

Stand by (at AC) Per Year

Safety Circuit Yes IC Protector(Micro Fuse) No

Radiation FCC/IC X-Radiation DHHS/HWC

Storage -20oC ~ +60oC

90 degree

2.5+2.5 W

2.0+2.0 W

105 W at AC 120 V 60 Hz 3 W at AC 120 V 60 Hz

-- kWh/Year

2 - 69, 4A, A-5 - A-1,

A3-1

GENERAL SPECIFICATIONS

G-7 On Screen Menu Yes

G-8 OSD Language English French Spanish

Display Menu Type Icon

Picture Yes

Sound Yes

Set Up Yes

Option

Control Level Yes

Stereo,Audio Output,SAP Yes Video Yes Color Stream Yes Channel(TV/Cable) Yes CH Label Yes Game Timer Yes Sleep Timer Yes Sound Mute Yes V-chip Rating Yes 16: 9 Yes

Contrast Yes Brightness Yes Color Yes Tint Yes Sharpness Yes

Bass Yes Treble Yes Balance Yes BBE On/Off Yes Stable Sound On/Off Yes Surround On/Off Yes

TV/CATV Yes Auto CH Memory Yes Add/ Delete Yes

Yes Language Yes CH Label Yes Favorite CH Yes V-Chip Yes Lock Yes On/Off Timer Yes Color Stream DVD/DTV Yes

Volume Yes Brightness Yes Contrast Yes Color Yes Tint Yes Sharpness Yes Tuning No Bass Yes Treble Yes Balance Yes Back Light No

G-9 Clock and Sleep Timer Max Time 120 Min

Timer Step 10 Min

On/Off Timer Program(On Timer / Off Timer / Clock) Yes Wake Up Timer No Timer Back-up (at Power Off Mode) more than -- Min Sec

A3-2

GENERAL SPECIFICATIONS

G-10 Remote Unit RC-GW

Control Glow in Dark Remocon Yes

Format Toshiba Custom Code Power Source Voltage(D.C) 3V

UM size x pcs UM-4 x 2 pcs

Total Keys 50 Keys Keys Power Yes

1 Yes 2 Yes 3 Yes 4 Yes 5 Yes 6 Yes 7 Yes 8 Yes 9 Yes 0 Yes 100 Yes CH Up Yes CH Down Yes Volume Up Yes Volume Down Yes TV/Caption/Text Yes CH1/CH2 Yes TV/Video(TV/AV) Yes CH RTN/CH ENT(Quick View) Yes Sleep Yes RE Call(Call) Yes Reset Yes Menu/Enter Yes Mute Yes Exit Yes MTS(Audio Select) Yes Fav.Up Yes Fav.Down Yes 16: 9 Yes

Multi Brand Keys CH Up(VCR) Yes

CH Down(VCR) Yes Pause/Still Yes TV/VCR(VCR) Yes FF Yes Rew Yes Rec Yes Play Yes Stop Yes TV Yes VCR Yes Cable Yes DVD Yes CODE Yes Volume Up(DVD) Yes Volume Down(DVD) Yes DVD CLEAR Yes TOP MENU Yes DVD MENU Yes DISPLAY Yes

TV:40-BF h

A3-3

GENERAL SPECIFICATIONS

G-11 Features Auto Degauss Yes

G-12 Accessories Owner's Manual Language English / French

Auto Shut Off Yes Canal+ No CATV Yes Anti-theft No Rental No Memory(Last CH) Yes Memory(Last Volume) Yes V-Chip Yes

BBE Yes Auto Search No CH Allocation No SAP Yes Just Clock Function No CH Label Yes VM Circuit Yes Full OSD No Premiere No Comb Filter Yes

Auto CH Memory Yes Hotel Lock No Closed Caption Yes Stable Sound Yes FBT Leak Test Protect Yes CH Lock Yes Video Lock Yes Game Timer (Max Time:120 Min) Yes Energy Star No Favorite CH Yes Surround Yes 16:9 Mode Yes

Remote Control Unit Yes Rod Antenna

Loop Antenna

U/V Mixer DC Car Cord (Center+) Guarantee Card Warning Sheet Circuit Diagram Antenna Change Plug Service Station List Important Safety Instruction Dew/AHC Caution Sheet AC Plug Adapter Quick Set-up Sheet Battery Yes

AC Cord AV Cord (2Pin-1Pin) Registration Card (NDL Card) Yes PTB Sheet ESP Card 300 ohm to 75 ohm Antenna Adapter

Type USA,Toshiba Type

3 Lines

W/ Warranty Yes

Poles Terminal

Terminal -

UM size x pcs UM-4 x 2 OEM Brand

No No No No No No No No No No No

No No No

No No[From '04 MAR O/R] No

A3-4

GENERAL SPECIFICATIONS

G-13 Interface Switch Front Power Yes

Rear AC/DC No

Indicator Power Yes(RED)

Terminals Front Video Input = VIDEO3

Rear Video Input(Rear1) = VIDEO1

G-14 Set Size Approx. W x D x H (mm) G-15 Weight Net (Approx.)

G-16 Carton Master Carton

Gift Box Yes

Drop Test

Container Stuffing 272

G-17 Cabinet Material Cabinet Cabinet Front PS 94V0 DECABROM

PCB Non-Halogen Demand

G-18 Environment Pb Free Lead-free Solder No

Cd Free No

System Select No Main Power SW No Sub Power No Channel Up Yes Channel Down Yes Volume Up Yes Volume Down Yes

TV/CATV Selector No Degauss No Main Power SW No

Stand-by No On Timer No

Audio Input = VIDEO3 Other Terminal

Video Input(Rear2) = VIDEO2 Audio Input(Rear1) = VIDEO1 Audio Input(Rear2) = VIDEO2 Video Output Audio Output Euro Scart No Color Stream S Input Yes Diversity No Ext Speaker No DC Jack 12V(Center +) No VHF/UHF Antenna Input AC Outlet No

Gross (Approx.)

Content ---Material -- Dimensions W x D x H(mm) -- x -- x -- Description of Origin

Material Double/Brown Dimensions W x D x H(mm) Design As per Buyer's Description of Origin Yes

Height (cm) 60 (ORION SPEC:46)

Cabinet Rear PS 94V0 DECABROM

Eyelet Demand Yes

RCA

RCA x 2

Head Phone

RCA

RCA x 2

RCA

RCA x 2

RCA x 3

F Type

590 x 484 x 446.5

23 kg

26.5 kg

695 x 575 x 549

Natural Dropping At 1 Corner / 2

( 50.6 lbs) ( 58.3 lbs) No Sets /--

Edges / 4 Surfaces

Sets/40' container

A3-5

DISASSEMBLY INSTRUCTIONS

1. REMOVAL OF ANODE CAP

Read the following NOTED items before starting work. *

After turning the power off there might still be a potential voltage that is very dangerous. When removing the Anode Cap, make sure to discharge the Anode Cap's potential voltage.

Do not use pliers to loosen or tighten the Anode Cap terminal, this may cause the spring to be damaged.

REMOVAL

1. Follow the steps as follows to discharge the Anode Cap.

(Refer to Fig. 1-1.)

Connect one end of an Alligator Clip to the metal part of a flat-blade screwdriver and the other end to ground. While holding the plastic part of the insulated Screwdriver, touch the support of the Anode with the tip of the Screwdriver. A cracking noise will be heard as the voltage is discharged.

GND on the CRT

3. After one side is removed, pull in the opposite direction to remove the other.

NOTE

Take care not to damage the Rubber Cap.

INSTALLATION

1. Clean the spot where the cap was located with a small amount of alcohol. (Refer to Fig. 1-3.)

Location of Anode Cap

Fig. 1-3

NOTE

Confirm that there is no dirt, dust, etc. at the spot where the cap was located.

2.3.Arrange the wire of the Anode Cap and make sure the wire is not twisted. Turn over the Rubber Cap. (Refer to Fig. 1-4.)

Screwdriver

Alligator Clip

GND on the CRT

Flip up the sides of the Rubber Cap in the direction of the

2. arrow and remove one side of the support.

(Refer to Fig. 1-2.)

Rubber Cap

CRT

Support

CRT

Fig. 1-1

Fig. 1-2

4. Insert one end of the Anode Support into the anode button, then the other as shown in Fig. 1-5.

Support

CRT

5.6.Confirm that the Support is securely connected. Put on the Rubber Cap without moving any parts.

B1-1

Fig. 1-4

Fig. 1-5

DISASSEMBLY INSTRUCTIONS

REMOVAL AND INSTALLATION OF FLAT PACKAGE IC

REMOVAL

Put the Masking Tape (cotton tape) around the Flat

1. Package IC to protect other parts from any damage.

(Refer to Fig. 2-1.) NOTE

Masking is carried out on all the parts located within 10 mm distance from IC leads.

When IC starts moving back and forth easily after

3. desoldering completely, pickup the corner of the IC using a tweezers and remove the IC by moving with the IC desoldering machine. (Refer to Fig. 2-3.)

NOTE

Some ICs on the PCB are affixed with glue, so be careful not to break or damage the foil of each IC leads or solder lands under the IC when removing it.

Blower type IC desoldering machine

Masking Tape (Cotton Tape)

Heat the IC leads using a blower type IC desoldering

machine. (Refer to Fig. 2-2.)

NOTE

Do not add the rotating and the back and forth directions force on the IC, until IC can move back and forth easily after desoldering the IC leads completely.

Blower type IC desoldering machine

Fig. 2-1

Tweezers

Peel off the Masking Tape.4. Absorb the solder left on the pattern using the Braided

5. Shield Wire. (Refer to Fig. 2-4.)

NOTE

Do not move the Braided Shield Wire in the vertical direction towards the IC pattern.

Fig. 2-3

Braided Shield Wire

Soldering Iron

Fig. 2-2

IC pattern

Fig. 2-4

B2-1

DISASSEMBLY INSTRUCTIONS

INSTALLATION

Take care of the polarity of new IC and then install the new

1. IC fitting on the printed circuit pattern. Then solder each lead on the diagonal positions of IC temporarily.

(Refer to Fig. 2-5.)

Soldering Iron

Solder temporarily

Fig. 2-5

Supply the solder from the upper position of IC leads

2. sliding to the lower position of the IC leads. (Refer to Fig. 2-6.)

4. When bridge-soldering between terminals and/or the soldering amount are not enough, resolder using a Thintip Soldering Iron. (Refer to Fig. 2-8.)

Thin-tip Soldering Iron

Fig. 2-8

Finally, confirm the soldering status on four sides of the IC

using a magnifying glass. Confirm that no abnormality is found on the soldering position and installation position of the parts around the IC. If some abnormality is found, correct by resoldering.

NOTE

When the IC leads are bent during soldering and/or repairing, do not repair the bending of leads. If the bending of leads are repaired, the pattern may be damaged. So, always be sure to replace the IC in this case.

Soldering IronSolder

Supply soldering from upper position to lower position

Fig. 2-6

Absorb the solder left on the lead using the Braided Shield

3. Wire. (Refer to Fig. 2-7.)

NOTE

Do not absorb the solder to excess.

Soldering Iron

Braided Shield Wire

Fig. 2-7

B2-2

SERVICE MODE LIST

This unit provided with the following SERVICE MODES so you can repair, examine and adjust easily. To enter the Service Mode, press both set key and remote control key for more than 1 second.

Set Key

VOL. (-) MIN

VOL. (-) MIN 8

VOL. (-) MIN

Remocon Key Operations

Releasing of V-CHIP PASSWORD. Initialization of the factory.

NOTE:

POWER ON total hours is displayed on the screen. Refer to the "CONFIRMATION OF HOURS USED".

Can be checked of the INITIAL DATA of MEMORY IC. Refer to the "WHEN REPLACING EEPROM (MEMORY) IC".

Writing of EEPROM initial data. NOTE: Do not use this for the normal servicing.

Display of the Adjustment MENU on the screen. Refer to the "ELECTRICAL ADJUSTMENT" (On-Screen Display Adjustment).

Do not use this for the normal servicing. If you set a factory initialization, the memories are reset such as the channel setting, and the POWER ON total hours.

CONFIRMATION OF HOURS USED

POWER ON total hours can be checked on the screen. Total hours are displayed in 16 system of notation.

NOTE: If you set a factory initialization, the total hours is reset to "0".

Set the VOLUME to minimum.

Press both VOL. DOWN button on the set and Channel button (6) on the remote control for more than 1 second.

After the confirmation of using hours, turn off the power.

ADDRESS DATA

INIT 00 50 CRT ON 0010

FIG. 1

Initial setting content of MEMORY IC. POWER ON total hours.

= (16 x 16 x 16 x thousands digit value) + (16 x 16 x hundreds digit value) + (16 x tens digit value) + (ones digit value)

WHEN REPLACING EEPROM (MEMORY) IC

If a service repair is undertaken where it has been required to change the MEMORY IC, the following steps should be taken to ensure correct data settings while making reference to TABLE 1.

NOTE: No need setting for after INI 1F due to the adjustment value.

INI

+0 +1 +2 +3 +4 +5 +6 +7 +8 +9 +A +B +C +D +E +F

00 0A 04 40 40 40 7F

50 E8 0A 45 5E B3 24 B7 3D AC 50 00 00 00 00 00 00 3F 0F10 00 0D E2 94 88 3F 00

Table 1

Enter DATA SET mode by setting VOLUME to minimum.

Press both VOL. DOWN button on the set and Channel button (6) on the remote control for more than 1 second. ADDRESS and DATA should appear as FIG 1.

ADDRESS is now selected and should "blink". Using the VOL. UP/DOWN button on the remote, step through the ADDRESS until required ADDRESS to be changed is reached.

Press ENTER to select DATA. When DATA is selected, it will "blink".

Again, step through the DATA using VOL. UP/DOWN button until required DATA value has been selected.

Pressing ENTER will take you back to ADDRESS for further selection if necessary.

Repeat steps 3 to 6 until all data has been checked.

When satisfied correct DATA has been entered, turn POWER off (return to STANDBY MODE) to finish DATA input.

After the data input, set to the initializing of shipping.

Turn POWER on.

10.

Press both VOL. DOWN button on the set and Channel button (1) on the remote control for more than 1 second.

11.

After the finishing of the initializing of shipping, the unit will turn off automatically.

The unit will now have the correct DATA for the new MEMORY IC.

C-1

ELECTRICAL ADJUSTMENTS

BEFORE MAKING ELECTRICAL ADJUSTMENTS

Read and perform these adjustments when repairing the circuits or replacing electrical parts or PCB assemblies.

CAUTION

Use an isolation transformer when performing any service

•

on this chassis. Before removing the anode cap, discharge electricity

•

because it contains high voltage. When removing a PCB or related component, after

•

unfastening or changing a wire, be sure to put the wire back in its original position. When you exchange IC and Transistor for a heat sink, apply

•

the silicon grease on the contact section of the heat sink. Before applying new silicon grease, remove all the old silicon grease. (Old grease may cause damages to the IC and Transistor.)

Prepare the following measurement tools for electrical adjustments.

1. Oscilloscope

2. Digital Voltmeter

3. Multi-sound Generator

4. Pattern Generator

On-Screen Display Adjustment

In the condition of NO indication on the screen.

Press the VOL. DOWN button on the set and the Channel button (9) on the remote control for more than 1 second to appear the adjustment mode on the screen as shown in Fig. 1-1.

2. BASIC ADJUSTMENTS

2-1: CONSTANT VOLTAGE

Place the set with Aging Test for more than 5 minutes.

Set condition is AV MODE without signal.

Using the remote control, set the brightness and contrast to normal position.

Connect the digital voltmeter to the TP003.

Adjust the VR502 until the digital voltmeter is 1 15 ± 1V.

2-2: CUT OFF

Place the set with Aging Test for more than 15 minutes.

Activate the adjustment mode display of Fig. 1-1 and press the channel button (01) on the remote control to select "CUT OFF".

Adjust the Screen Volume until a dim raster is obtained.

2-3: WHITE BALANCE NOTE: Adjust after performing CUT OFF adjustment.

Place the set with Aging Test for more than 10 minutes.

Receive the gray scale pattern from the Pattern Generator.

Using the remote control, set the brightness and contrast to normal position.

Activate the adjustment mode display of Fig. 1-1 and press the channel button (10) on the remote control to select “R. DRIVE”.

Press the CH. UP/DOWN button on the remote control to select the “R. BIAS”, “G. BIAS”, “B. BIAS”, “R. DRIVE” or “B. DRIVE”.

Adjust the VOL. UP/DOWN button on the remote control to whiten the R. BIAS, G. BIAS, B. BIAS, R. DRIVE, and B. DRIVE at each step tone sections equally.

Perform the above adjustments 5 and 6 until the white color is looked like a white.

00 OSD 25

Use the Channel UP/DOWN button or Channel button (0-

9) on the remote control to select the options shown in Fig. 1-2.

Press the MENU button on the remote control to end the

adjustments.

FUNCTION

NO.

OSD H

CUT OFF

H.VCO

H.PHASE

AFC GAIN

V.SHIFT

H.SIZE

V.SIZE

V.LINEARITY

VS CORRECTION

DRIVE R

DRIVE B

R CUT OFF

FUNCTION

NO.

G CUT OFF

B CUT OFF

BRIGHT MAX

BRIGHT CENT

BRIGHT MIN

CONTRAST MAX

CONTRAST CENT

CONTRAST MIN

COLOR MAX

COLOR CENT

COLOR MIN

TINT

SHARPNESS

FUNCTION

NO.

CB DELAY FINE

CR DELAY FINE

CB PEDESTAL ADJ

CR PEDESTAL ADJ

E/W PARABOLA

E/W CORNER

31. E/W TRAPEZIUM

32. LEVEL

33. SEPARATION 1

34. SEPARATION 2

35.

Fig. 1-2

Fig. 1-1

2-4: FOCUS

Receive a broadcast.

Turn the Focus Volume fully counterclockwise once.

Adjust the Focus Volume until picture is distinct.

2-5: HORIZONTAL PHASE

Receive the monoscope pattern.

Using the remote control, set the brightness and contrast to normal position.

Activate the adjustment mode display of Fig. 1-1 and press the channel button (03) on the remote control to select "H.PHAS".

Press the VOL. UP/DOWN button on the remote control until the SHIFT quantity of the OVER SCAN on right and left becomes minimum.

2-6: VERTICAL POSITION

Receive the monoscope pattern.

1. Using the remote control, set the brightness and contrast

2. to normal position. Check if the step No. V. SHIFT is "02".

3. Adjust the VR401 until the horizontal line becomes fit to

4. the notch of the shadow mask.

D-1

ELECTRICAL ADJUSTMENTS

2-7: VERTICAL SIZE

Receive the monoscope pattern.

Using the remote control, set the brightness and contrast to normal position.

Activate the adjustment mode display of Fig. 1-1 and press the channel button (07) on the remote control to select "V.SIZE".

Press the VOL. UP/DOWN button on the remote control until the SHIFT quantity of the OVER SCAN on upside and downside becomes 9 ± 2%.

Receive a broadcast and check if the picture is normal.

2-8: VERTICAL LINEARITY NOTE: Adjust after performing adjustments in section 2-7.

After the adjustment of Vertical Linearity, reconfirm the Vertical Position and Vertical Size adjustments.

Receive the monoscope pattern.

1. Using the remote control, set the brightness and contrast

2. to normal position. Activate the adjustment mode display of Fig. 1-1 and

3. press the channel button (08) on the remote control to select "V.LIN". Press the VOL. UP/DOWN button on the remote control

4. until the SHIFT quantity of the OVER SCAN on upside and downside becomes minimum.

2-9: BRIGHT CENT

Receive the monoscope pattern. (RF Input)

Using the remote control, set the brightness and contrast to normal position.

Activate the adjustment mode display of Fig. 1-1 and press the channel button (16) on the remote control to select "BRI CENT".

Press the VOL. UP/DOWN button on the remote control until the white 15% is starting to be visible

Receive the monoscope pattern. (Audio Video Input)

Press the TV/VIDEO button on the remote control to set to the AV mode. Then perform the above adjustments 2~4.

Press the TV/VIDEO button on the remote control to set to the CS mode.

Activate the adjustment mode display of Fig. 1-1 and press the channel button (16) on the remote control to select "BRI CENT".

Press the VOL. UP/DOWN button on the remote control until the contrast step No. becomes "77".

10.

Receive a broadcast and check if the picture is normal.

2-10: TINT/COLOR CENT

Receive the color bar pattern. (RF Input)

Connect the oscilloscope to TP806.

Using the remote control, set the brightness, contrast, color and tint to normal position.

Activate the adjustment mode display of Fig. 1-1 and press the channel button (24) on the remote control to select “TINT”.

Press the VOL. UP/DOWN button on the remote control until the section “A” becomes a straight line (Refer to Fig. 2-1).

Connect the oscilloscope to TP804.

Press the CH DOWN button 2 times to set to “COL. CENT” mode.

Adjust the VOLTS RANGE VARIABLE knob of the oscilloscope until the range between white 100% and 0% is set to 5 scales on the screen of the oscilloscope.

Press the VOL. UP/DOWN button on the remote control until the red color level is adjusted to 120 ± 10% of the white level. (Refer to Fig. 2-2)

10.

Receive the color bar pattern. (Audio Video Input)

11.

Press the TV/VIDEO button on the remote control to set to the AV mode. Then perform the above adjustments 2~9.

12.

Press the TV/VIDEO button on the remote control to set to the CS mode.

13.

Activate the adjustment mode display of Fig. 1-1 and press the channel button (24) on the remote control to select “TINT”.

Press the VOL. UP/DOWN button on the remote control until the contrast step No. becomes "58".

15.

Press the CH DOWN button 2 times to set to “COL.CENT” mode.

16.

Press the VOL. UP/DOWN button on the remote control until the contrast step No. becomes "71".

17.

Receive a broadcast and check if the picture is normal.

“A”

Fig. 2-1

D-2

White 100%

100%

RED Level

Fig. 2-2

ELECTRICAL ADJUSTMENTS

2-11: CONTRAST MAX MANUAL

Activate the adjustment mode display of Fig. 1-1 and

1. press the channel button (18) on the remote control to select "CONT.MAX". Press the VOL. UP/DOWN button on the remote control

2. until the contrast step No. becomes "86". Receive a broadcast and check if the picture is normal.

3. Press the TV/VIDEO button on the remote control to set

4. to the AV mode. Then perform the above adjustments 1~3. Press the TV/VIDEO button on the remote control to set

5. to the CS mode. Then perform the above adjustments 1~3.

2-12: SEPARATION 1, 2 Please do the method (1) or method (2) adjustment. Method (1)

Set the multi-sound signal generator for each different Lch and R-ch frequency (Ex. L-ch=2KHz, R-ch=400Hz) and receive the RF.

Connect the oscilloscope to the Audio Out Jack.

Activate the adjustment mode display of Fig. 1-1 and press the channel button (34) on the remote control to select “SEP 1”.

Press the VOL. UP/DOWN button on the remote control to adjust it until the audio output wave becomes a fine sine wave.

Press the CH UP button once the set to “SEP 2” mode. Then perform the above adjustment 4.

Method (2)

Set the multi-sound signal generator L-ch=1KHz, R-ch =Non input and receive the RF.

Connect the oscilloscope to the Audio Out Jack (R-ch).

Press the AUDIO SELECT button on the remote control to set to the stereo mode.

Activate the adjustment mode display of Fig. 1-1 and press the channel button (34) on the remote control to select “SEP 1”.

Press the VOL. UP/DOWN button on the remote control to adjust it until the R-ch output becomes minimum.

Set the multi-sound signal generator L-ch=Non input, R-ch=1KHz and receive the RF.

Connect the oscilloscope to the Audio Out Jack (L-ch).

Activate the adjustment mode display of Fig. 1-1 and press the channel button (35) on the remote control to select “SEP 2”.

Press the VOL. UP/DOWN button on the remote control to adjust it until the L-ch output becomes minimum.

2-13: LEVEL

Receive the monoscope pattern (70dB).

Connect the AC voltmeter to pin 6 of CP101.

Activate the adjustment mode display of Fig. 1-1 and press the channel button (33) on the remote control to select "LEVEL".

Press the VOL. UP/DOWN button on the remote control until the AC voltmeter is 85 ± 2mV.

2-14: Confirmation of Fixed Value (step No.)

Please check if the fixed values of the each adjustment items are set correctly referring below.

NO.

FUNCTION

OSD H

H.VCO

AFC GAIN

V.SHIFT

H.SIZE

VS CORRECTION

BRIGHT MAX

BRIGHT MIN

CONTRAST CENT

CONTRAST MIN

COLOR MAX

COLOR MIN

SHARPNESS

CB DELAY FINE

CR DELAY FINE

E/W PARABOLA

E/W CORNER

E/W TRAPEZIUM

STEP NO.

25 03 07 02 01 34

125

75 50 18 90 00 40 00 00 31 31 31

D-3

+ 34 hidden pages