Toshiba 20AF41C Service Manual

TOSHIBA

SERVICE MANUAL

FILE NO.050-200102

COLOR TELEVISION

20AF41C

DOCUMENT CREATED IN JAPAN, DEC., 2001

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.

PERFORM A SAFETY CHECK AFTER

7. 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

Earphone 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 and 4482866. BBE and BBE symbol are registered trademarks of BBE Sound, Inc.

GENERAL SPECIFICATIONS

G-1.Ou tline of t he Product

20 inch( 508.0 Color CRT 90 degree deflection

G-2.Broadcasting System

US System M

G-3.Color System NTSC PAL SECAM or Monochrome signal

mmV):Measured diagonally

G-4.NTSC Playback(PAL 60Hz) G-5.NTSC 3.58+4.43/PAL60Hz G-6.An tenna Input Impedance

VHF/UHF 75 ohm unbalanced

G-7.Tuner and Receiving Contactless Electric tuner

channel Tuner

channel coverage

(USA) 2~69 , 4A ,

Tuning System

Frequency syn. Voltage syn. Others

G-8.Preset Channel

-- channels

G-9.Intermediate Frequency

Picture(fP) 45.75 MHz Sound (fS) 41.25 MHz MHz MHz fP-fS 4.50 MHz MHz MHz

G-10.Stereo/Dual TV Sound

Yes( NICAM GERMAN USA JAPAN) No

G-11.Tune r S ound Muting

Oscar(W/O HYPER) Oscar(W/ HYPER) France CATV) Others

A-5~A-1, A~I , J~W, W+1~W+84

Yes No

Yes No Yes No

1Tuner System 2Tuner System

MHz MHz

G-12.Power Source 120 V

G-13.Power Consumption: 105 W at AC 120 V 60 Hz

- W at DC V Stand by: 4 W at AC 120 V 60 Hz Per Year: kWh / Year

G-14.Dimensions(Approx.)

590 mm(W) 487.5

G-15.Weight(Approx.) Net : 23 kg ( 50.6 lbs)

Gross: 26.5 kg ( 58.3 lbs)

G-16.Cabinet Material

Cabinet Front:

Back Pane l:

G-17.Protector:

Power Fuse

mm(D) 444 mm(H)

PS 94HB DECABROM ABS 94V2 NON-DECA

AC 50Hz AC 60Hz

94V0

GENERAL SPECIFICATIONS

G-18.Regulation

Safety

UL CSA SAA SI CE SEV BS NF NEMKO FEMKO DEMKO IEC65 SEMKO NZ HOMOLO SABS CNS SISIR NOM AS3159 DENTORI UNE GOST NONE

Radiation

FCC DOC FTZ PTT CE SEV SABA SI NF NZ HOMOLO UNE CNS CISPR13 DENTORI AS/NZS NONE

X-Radiation

PTB DHHS HWC DENTORI NONE

G-19.Temperature

Operation 5 ºC~ 40 Storage -20 ºC~ 60 ºC

G-20.Operating Humidity Less than 80 %RH G-21.Clock and Timer

Sleep Timer On/Off Timer Yes Programs No Wake Up Timer Yes Programs No

G-22.Timer back up Ti me

More than -- Minutes (at Power Off Mode)

G-23.Terminals

VHF/UHF Antenna Din Type F-Type France Type Video Input(Front) (RCA ø8.3x 1) Video Input(Rea r 1) (RCA ø8.3x1) Video Input(Rea r 2) (RCA ø8.3x1) Video Output(Rear) (RCA ø8.3x1) Audio In put(Front) (RCA ø8.3x2) Audio In put(Rear1) (R CA ø8.3x2) Audio In put(Rear2) (R CA ø8.3x2) Audio Output(Rear) (RCA ø8.3x2) 21 Pin (x ) DC Jack(Center +) Ear Phone Jack(ø3. 5) Head Phone Jack(ø3.5) AC Outlet Ext Speaker Diversity S Input(Front) S Input(Rear) Color Streem (RCA ø8.3x3 )

G-24.Indicator

Power Stand By On Timer NONE

( RED ) (

G-25.Display

On Screen Display

Menu (Windows Type/Picture Menu)

Picture

SOUND

SETUP

OPTION

Contro l Level Sound Brightness Contrast

Stereo,Audio Output,SAP Video ColorStream Channel CH Label Sleep Timer Sound Mute V-Chip Rating

) ( )

Contrast Brightness Color Tint Sharpness

Bass Treble Balance BBE ON/OFF Stable Sound ON /OFF

TV/CATV CH Prpgram Add/Erase

Language CH Label Favorit e CH V-CHIP Color Streem DVD/DTV

Color Tint(NTSC Only) Sharpness Tuning Bass Treble Balance Back Light

ºC

Yes Max 120 Min.( 10 Min. Step) No

GENERAL SPECIFICATIONS

G-26.O S D Language

Eng Ger Fre Spa Ita Por Jpn

OSD Language Se tting

Eng Ger Fre Spa Ita Por Jpn Not Appl icable

G-27.Speaker

Pos ition Size 2x4.7 inches Imp 8 ohm x 2 pcs Power Max 2.5 + 2.5 W

G-28.EX T Speaker

Yes - W Imp - ohm NO

G-29.Carton

Master Carton:

Content: ---- Set Material: ---- / ---- Corrugated Carton Dimensions: ---- mm(W) ---- mm(D) ---- mm(H) Description of Origin Yes No

Gift Box

Material

Dimensions: 658 mm(W) 575 Design: As Per BUYER 's Description of Origin: Yes No

Drop Test Natural Dropping At 1 Corner / 3 Edges / 6 Surfaces

Container Stuffing: 288 Sets / 40' container

Need No Need

Double/Brown Corrugated Carton ( with Ph oto Label) Double/White Corrugated Carton ( with Photo Label) Double Full Color Carton W/Photo

Height

Front Side Bottom

10% 2.0 + 2.0 W (Typical)

mm(D) 529 mm(H)

25cm 31cm 46cm 62cm 80cm

G-30.Accessories

Owner's Manual ( W/Wa rranty) [English/French] Channel Film AC Plug Adapter Remote Control Unit Battery (UM- 4 x 2 ) Safety Tip Toll Free Insert Sheet Guarantee Ca rd Audio-Video Cord (RCA) Registration/Warranty Card Warning Sheet Quick Se t-Up Sheet Schematic Diagram Information Sheet U/V Mixer 75 ohm Coaxial Cable ( Single Shield Double Shield) 300 ohm to 75 ohm Antenna Plug 21pin Cable Car Cord Rod Ant enn a

One Pole Two Pole ( F-Type Din Type France Type) Loop Antenna ( F-Type Din Type France Type) Importan t Safety Instructi ons Service St a ti on List Envelope

G-31.Other Features

Auto Degauss Auto Search Full OSD Auto Shut Off CH Allocation Premiere Canal+ SAP Comb Filter(3 LIN E) CATV Channel Lock Auto CH Memory Anti-Theft Just Clock Function Hotel Lock Rental Game Position Closed Caption Memory ( Last CH Last Vol.) Stable Sound V-Chip(Toshiba Type) CH LAVEL Favorit e CH BBE VM Circuit

G-32.Switch

Front

Power(Tact) Channel Up Volume Up System Select Channel Down Volume Down Main Power SW Sub Power

Rear

AC/DC TV/CATV Selector Degauss Main Power SW

G-33.Magnetic Fiel d

BV : +0.45G BV : +0.35G BV : +0.25G BH : 0.18G BH : 0.30G BH : 0.30G BV : -0.15G BV : -0.25G BV : -0.50G BH : 0.15G BH : 0.15G BH : 0.30G

GENERAL SPECIFICATIONS

G-34.Remote Control Unit: RC-DU

Glow in Dark Remocon Yes No Power Source: D.C 3 V Battery UM - 4 x 2

Total 42 Key

Power 0 Muting TV/Video(TV/AV) 1 TV/Caption/Text Volume Up 2 CH1/CH2 Volume Down 3 Sleep MT S( A ud io S elect) 4 RE Call(Ca ll) CH Down 5 Reset CH Up 6 Menu/Enter FAV. UP 7 EXIT FAV. DOWN 8 CH RTN/CH ENT(Quick View) 9 100

Multi Brand Key

CH Up(VCR) FF TV CH Down(VCR) Rec VCR Pause/Still Stop Cable TV/VCR(VCR) Rew Play CODE

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

Fig. 1-4

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.

Fig. 1-5

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 Remocon Key Operations

VOL. (-) MIN

Releasing of V-CHIP PASSWORD.

VOL. (-) MIN 1

VOL. (-) MIN 6

VOL. (-) MIN 8

VOL. (-) MIN

Initialization of the factory. NOTE: Do not use this for the normal servicing.

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

Can be checked of the INITIAL DATA of MEMORY IC. Refer to the "NOTE FOR THE REPLACING OF 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).

CONFIRMATION OF USING HOURS

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

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 83 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)

NOTE FOR THE REPLACING OF 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.

+0 +1 +2 +3 +4 +5 +6 +7 +8 +9 A1 C3 CF 00 31 B3 27 37 BE E8

00 F4 84 00 00 00 46

40 --- --- --- --- --- --- --- ---

Enter DATA SET mode by setting VOLUME to minimum.

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

2. 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

3. ADDRESS until required ADDRESS to be changed is reached. Press ENTER to select DATA. When DATA is selected, it will "blink".

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

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

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

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

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

---

Table 1

+B +C +D +E +FINI

--- --- --- --- --- ---

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. Inferior silicon grease can damage IC's and transistors.

•

When replacing IC's and transistors, use only specified silicon grease. Remove all old silicon before applying new silicon.

Prepare the following measurement tools for electrical adjustments.

1. Synchro Scope

2. Digital Voltmeter

On-Screen Display Adjustment

In the condition of NO indication on the screen.

1. 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.

00 OSD 15

Fig. 1-1

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.

2. BASIC ADJUSTMENTS

2-1: CONSTANT VOLTAGE

Set condition is AV MODE without signal.

Connect the digital voltmeter to TP002.

Adjust the VR502 until the digital voltmeter is 111 ± 1V.

2-2: RF AGC

Receive a 70dB monoscope pattern.

Connect the digital voltmeter between the TP001 and the GND.

Activate the adjustment mode display of Fig. 1-1 and press the channel button (02) on the remote control to select "RF. AGC".

Press the VOL. UP/DOWN button on the remote control until the digital voltmeter is 1.95 ± 0.05V.

2-3: CUT OFF

Adjust the unit to the following settings. G. DRIVE=64, B. DRIVE=64, R. BIAS=32, G. BIAS=32, B. BIAS=32, BRIGHTNESS=70, UNI COLOR=64.

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.

2-4: WHITE BALANCE NOTE: Adjust after performing CUT OFF adjustment.

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

Receive the white 100% signal from the Pattern Generator.

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

Activate the adjustment mode display of Fig. 1-1 and press the channel button (13) on the remote control to select "R. BIAS".

Using the VOL. UP/DOWN button on the remote control, adjust the R. BIAS.

Press the CH. UP/DOWN button on the remote control to select the "G. DRV", "B. DRV", "G. BIAS" or "B. BIAS".

Using the VOL. UP/DOWN button on the remote control, adjust the G. DRV, B. DRV, G. BIAS or B. BIAS.

Perform the above adjustments 6 and 7 until the white color is looked like a white.

NO.

00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16

FUNCTION

OSD H CUT OFF RF. AGC

--H. POSI V. POSI H. SIZE V. SIZE V. CENT V. LIN VS. CORR G. DRV B. DRV R. BIAS G. BIAS B. BIAS BRI

NO.

17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33

FUNCTION

SUBCONT UNI COL

--TINT SHARP RGB CONT PARABOLA TRAPEZIU COR TOP COR BTM V EHT H EHT FM. LVL LEVEL SEP1 SEP2 T. STE

Fig. 1-2

2-5: FOCUS

Receive a 70dB monoscope pattern.

Turn the Focus Volume fully counterclockwise once.

Adjust the Focus Volume until picture is distinct.

2-6: HORIZONTAL POSITION

Receive the center cross signal 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 (04) on the remote control to select "H. POSI".

Press the VOL. UP/DOWN button on the remote control until the right and left screen size of the vertical line becomes the same.

ELECTRICAL ADJUSTMENTS

2-7: HORIZONTAL SIZE NOTE: Adjust after performing adjustments in section 2-6.

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 (06) on the remote control to select "H. SIZE".

Press the VOL. UP/DOWN button on the remote control until the SHIFT quantity of the OVER SCAN on right and left becomes 10 ± 2%.

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

Receive the center cross signal from the Pattern Generator.

Activate the adjustment mode display of Fig. 1-1 and press the channel button (05) on the remote control to select "V. POSI".

Press the VOL. UP/DOWN button on the remote control until the horizontal line becomes fit to the notch of the shadow mask.

2-9: VERTICAL SIZE NOTE: Adjust after performing adjustments in section 2-8.

Receive the crosshatch signal from the Pattern Generator.

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 rectangle on the center of the screen becomes square.

Receive a broadcast and check if the picture is normal.

2-12: CORNER CORR TOP

Receive the crosshatch signal 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 (25) on the remote control to select "COR TOP".

Press the VOL. UP/DOWN button on the remote control until the upper section of the both ends vertical lines are straight.

2-13: CORNER CORR BOTTOM

Receive the crosshatch signal 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 (26) on the remote control to select "COR BTM".

Press the VOL. UP/DOWN button on the remote control until the bottom section of the both ends vertical lines are straight.

2-14: OSD HORIZONTAL

1.2.Activate the adjustment mode display of Fig. 1-1. Press the VOL. UP/DOWN button on the remote control until the difference of A and B becomes minimum.

(Refer to Fig. 2-1)

2-10: PARABOLA

Receive the crosshatch signal 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 (23) on the remote control to select "PARABOLA".

Press the VOL. UP/DOWN button on the remote control until the right and left vertical lines are straight.

2-11: TRAPEZIUM

Receive the crosshatch signal 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 (24) on the remote control to select "TRAPEZIU".

Press the VOL. UP/DOWN button on the remote control until the both vertical lines of the screen become parallel.

00 OSD 15

2-15: LEVEL

Receive a 70dB monoscope pattern.

Connect the AC voltmeter to TP901.

Activate the adjustment mode display of Fig. 1-1 and press the channel button (30) on the remote control to select "LEVEL".

Press the VOL. UP/DOWN button on the remote control until the AC voltmeter is 75 ± 2mV.

Fig. 2-1

ELECTRICAL ADJUSTMENTS

2-16: SEPARATION 1, 2

Receive the stereo signal (L=2KHz, R=400Hz).

1. Connect the AC voltmeter to AUDIO OUT JACK though

2. stereo filter (L=400Hz, R=2KHz). Activate the adjustment mode display of Fig. 1-1 and

3. press the channel button (31) on the remote control to select "SEP1". Press the VOL. UP/DOWN button on the remote control

4. until the output of L-CH and R-CH become minimum. Press the CH UP button once the set to "SEP2" mode.

5. Press the VOL. UP/DOWN button on the remote control

6. until the output of L-CH and R-CH become minimum. Press the CH DOWN button once the set to "SEP1"

7. mode. Repeat step 4 to step 7 several times.

8. The output difference of the between with Filter and without Filter should be more than 25db for both L and R.

2-17: BRIGHTNESS

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

Press the VOL. UP/DOWN button on the remote control until the brightness step No. becomes "68"

Press the TV/VIDEO button on the remote control to set to the AV mode. Then perform the above adjustments 1~2.

Press the TV/VIDEO button on the remote control to set to the CS mode. Then perform the above adjustments 1~2.

2-19: SUB TINT/SUB COLOR

Receive the color bar pattern. (RF Input)

Connect the synchro scope to TP806.

Activate the adjustment mode display of Fig. 1-1 and press the channel button (20) on the remote control to select "TINT".

Press the VOL. UP/DOWN button on the remote control until the waveform becomes as shown in Fig. 2-2.

Connect the synchro scope to TP804.

Press the CH DOWN button 3 times to set to "SUBCONT" mode.

Press the VOL. UP/DOWN button on the remote control until the red color level is adjusted to 115% of the white level. (Refer to Fig. 2-3)

Receive the color bar pattern. (Audio Video Input)

Press the TV/VIDEO button on the remote control to set to the AV mode. Then perform the above adjustments 2~7.

10.

Receive the color bar pattern. (Audio Video Input)

11.

Press the TV/VIDEO button on the remote control to set to the CS mode. Then perform the above adjustments 2~6.

12.

Press the VOL. UP/DOWN button on the remote control until the red color level is adjusted to 140% of the white level. (Refer to Fig. 2-4)

2-18: UNI-COLOR

Activate the adjustment mode display of Fig. 1-1 and press the channel button (18) on the remote control to select "UNI COL".

Press the VOL. UP/DOWN button on the remote control until the contrast step No. becomes "8"

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

Activate the adjustment mode display of Fig. 1-1 and press the channel button (18) on the remote control to select "UNI COL".

Press the VOL. UP/DOWN button on the remote control until the contrast step No. becomes "4"

Press the TV/VIDEO button on the remote control to set to the CS mode. Then perform the above adjustments 4~5.

White 100%

RED Level

Fig. 2-2

Fig. 2-3

Fig. 2-4

ELECTRICAL ADJUSTMENTS

PURITY AND CONVERGENCE ADJUSTMENTS

NOTE

Turn the unit on and let it warm up for at least 30 minutes before performing the following adjustments.

Place the CRT surface facing east or west to reduce the terrestrial magnetism.

Turn ON the unit and demagnetize with a Degauss Coil.

3-1: STATIC CONVERGENCE (ROUGH ADJUSTMENT)

Tighten the screw for the magnet. Refer to the adjusted CRT for the position. (Refer to Fig. 3-1) If the deflection yoke and magnet are in one body, untighten the screw for the body.

Receive the green raster pattern from the color bar generator.

Slide the deflection yoke until it touches the funnel side of the CRT.

Adjust center of screen to green, with red and blue on the sides, using the pair of purity magnets.

Switch the color bar generator from the green raster pattern to the crosshatch pattern.

Combine red and blue of the 3 color crosshatch pattern on the center of the screen by adjusting the pair of 4 pole magnets.

Combine red/blue (magenta) and green by adjusting the pair of 6 pole magnets.

Adjust the crosshatch pattern to change to white by repeating steps 6 and 7.

3-2: PURITY NOTE

Adjust after performing adjustments in section 3-1.

3-3: STATIC CONVERGENCE NOTE

Adjust after performing adjustments in section 3-2.

Receive the crosshatch pattern from the color bar generator.

Combine red and blue of the 3 color crosshatch pattern on the center of the screen by adjusting the pair of 4 pole magnets.

Combine red/blue (magenta) and green by adjusting the pair of 6 pole magnets.

3-4: DYNAMIC CONVERGENCE

NOTE

Adjust after performing adjustments in section 3-3.

1.2.Adjust the differences around the screen by moving the deflection yoke upward/downward and right/left.

(Refer to Fig. 3-2-a)

Insert three wedges between the deflection yoke and CRT funnel to fix the deflection yoke.

(Refer to Fig. 3-2-b)

R G B

UPWARD/DOWNWARD SLANT RIGHT/LEFT SLANT

R G B

Fig. 3-2-a

R G B

Receive the green raster pattern from color bar generator.

Adjust the pair of purity magnets to center the color on the screen. Adjust the pair of purity magnets so the color at the ends are equally wide.

Move the deflection yoke backward (to neck side) slowly, and stop it at the position when the whole screen is green.

Confirm red and blue colors.

Adjust the slant of the deflection yoke while watching the screen, then tighten the fixing screw.

DEFLECTION YOKE DEFLECTION YOKE SCREW MAGNET SCREW

PURITY MAGNETS 6 POLE MAGNETS

4 POLE MAGNETS

Fig. 3-1

WEDGE

WEDGE POSITION

Fig. 3-2-b

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