Toshiba 20A3E Schematic

FILE NO. 060-200111

SERVICE MANUAL

COLOUR TELEVISION

S1E Chassis

20A3E

PRINTED IN JAPAN, Aug., 2001 T

CHAPTER 1 GENERAL ADJUSTMENTS

SAFETY INSTRUCTIONS ........................................................................................................................................ 3

SET-UP ADJUSTMENT ............................................................................................................................................ 4

SERVICE MODE ...................................................................................................................................................... 6

DESIGN MODE ........................................................................................................................................................ 9

ELECTRICAL ADJUSTMENTS .............................................................................................................................. 10

CIRCUIT CHECK .................................................................................................................................................... 15

GENERAL ADJUSTMENTS

CHAPTER 2 SPECIFIC INFORMATIONS

SETTING & ADJUSTING DATA ............................................................................................................................. 16

LOCATION OF CONTROLS ................................................................................................................................... 17

PROGRAMMING CHANNEL MEMORY................................................................................................................. 18

CIRCUIT BLOCK DIAGRAM .................................................................................................................................. 20

CHASSIS AND CABINET REPLACEMENT PARTS LIST ......................................................................................21

PC BOARDS BOTTOM VIEW ................................................................................................................................. 27

TERMINAL VIEW OF TRANSISTORS ................................................................................................................... 30

TABLE OF CONTENTS

SPECIFIC INFORMATIONS

SPECIFICATIONS .................................................................................................................................................. 31

APPENDIX:

CIRCUIT DIAGRAM

– 2 –

CHAPTER 1 GENERAL ADJUSTMENTS

SAFETY INSTRUCTIONS

WARNING: BEFORE SERVICING THIS CHASSIS, READ THE “X-RAY RADIATION PRECAUTION”, “SAFETY PRECAU-

TION” AND “PRODUCT SAFETY NOTICE” INSTRUCTIONS BELOW.

X-RAY RADIATION PRECAUTION

1. Excessive high voltage can produce potentially hazard­ous X-RAY RADIATION. To avoid such hazards, the high
voltage must not be above the specified limit. The nominal
value of the high voltage of this receiver is (A) kV at zero
beam current (minimum brightness) under a (C) V AC power
source. The high voltage must not, under any circum­stances, exceed (B) kV.

Refer to table-1 for high voltage (A), (B) & AC voltage (C).
(See SETTING & ADJUSTING DATA on page 16)

Each time a receiver requires servicing, the high voltage
should be checked following the HIGH VOLTAGE CHECK
procedure in this manual. It is recommended that the read­ing of the high voltage be recorded as a part of the service
record. It is important to use an accurate and reliable high
voltage meter.

SAFETY PRECAUTION

WARNING : Service should not be attempted by anyone unfamiliar with the necessary precautions on this receiver. The following
are the necessary precautions to be observed before servicing this chassis.

1. An isolation transformer should be connected in the power line between the receiver and the AC line before any service is
performed on the receiver.

2. Always discharge the picture tube anode to the CRT conductive coating before handling the picture tube. The picture tube
is highly evacuated and if broken, glass fragments will be violently expelled. Use shatter proof goggles and keep picture tube
away from the unprotected body while handling.

3. When replacing a chassis in the cabinet, always be certain that all the protective devices are put back in place, such as; non­metallic control knobs, insulating covers, shields, isolation resistor-capacitor network etc.

2. The only source of X-RAY RADIATION in this TV receiver
is the picture tube. For continued X-RAY RADIATION pro­tection, the replacement tube must be exactly the same
type tube as specified in the parts list.

3. Some part in this receiver have special safety-related char­acteristics for X-RAY RADIATION protection. For contin­ued safety, parts replacement should be undertaken only
after referring to the PRODUCT SAFETY NOTICE below.

GENERAL ADJUSTMENTS

SPECIFIC INFORMATIONS

PRODUCT SAFETY NOTICE

Many electrical and mechanical parts in this chassis have special safety-related characteristics. These characteristics are
often passed unnoticed by a visual inspection and the protection afforded by them cannot necessarily be obtained by using
replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety char­acteristics are identified in this manual and its supplements; electrical components having such features are identified by
the international hazard symbols on the schematic diagram and the parts list.
Before replacing any of these components, read the parts list in this manual carefully. The use of substitute replacement
parts which do not have the same safety characteristics as specified in the parts list may create shock, fire, X-ray
radiation or other hazards.

– 3 –

WARNING: BEFORE SERVICING THIS CHASSIS, READ THE “X-RAY RADIATION PRECAUTION”, “SAFETY PRECAU-
TION” AND “PRODUCT SAFETY NOTICE” ON PAGE 3 OF THIS MANUAL.

■ The following adjustments should be made when a complete realignment is required or a new picture tube is installed.

Perform the adjustments in order as follows :

1. Colour Purity

2. Convergence

3. White Balance

Note: The PURITY/CONVERGENCE MAGNET assembly and rubber wedges need mechanical positioning.

Refer to figure 1.

GENERAL ADJUSTMENTS

*

COLOUR PURITY ADJUSTMENT
NOTE : Before attempting any purity adjustments, the receiver

1. Demagnetize the picture tube and cabinet using a degauss-

2. Set the brightness and contrast to maximum.

3. Use a green raster from among the built-in test signals.

4. Loosen the clamp screw holding the yoke and slide the

Mounting position of the purity magnet assembly should fit to same position as old one because slightly difference to
the position depend on a kind of tube.

There are no adjustment of purity and convergence in some picture tube (Unified with purity magnet)

should be operated for at least fifteen minutes.

ing coil.

yoke backward or forward to provide vertical green belt
(zone) in the picture screen.

SPECIFIC INFORMATIONS

SET-UP ADJUSTMENT

5. Remove the Rubber Wedges.

6. Rotate and spread the tabs of the purity magnet (See fig­ure 2.) around the neck of the picture tube until the green
belt is in the center of the screen. At the same time, enter
the raster vertically.

7. Slowly move the yoke forward or backward until a uniform
green screen is obtained. Tighten the clamp screw of the
yoke temporarily.

8. Check the purity of the red and blue raster.

GLASS CLOTH
TAPES

DEFLECTION
YOKE

29.1mm(28", 29")
25mm(25")
19mm(19", 20", 21")
14mm(13", 14")

PURITY/
CONVERGENCE
MAGNET ASS'Y

Figure 1.

TEMPORARY
MOUNTING

RUBBER WEDGE

ADHESIVE

DEFLECTION
YOKE

– 4 –

CONVERGENCE ADJUSTMENTS

NOTE: Before attempting any convergence adjustments, the

receiver should be operated for at least fifteen min­utes.

■ CENTER CONVERGENCE ADJUSTMENT

1. Use the cross-dot pattern from among the built-in test sig­nals.

2. Set the brightness and contrast for well defined pattern.

3. Adjust two tabs of the 4-Pole Magnets to change the an­gle between them (See figure 2.) and superimpose red
and blue vertical lines in the center area of the picture
screen.

4. Turn the both tabs at the same time keeping the angle
constant to superimpose red and blue horizontal lines at
the center of the screen.

5. Adjust two tabs of 6-Pole Magnets to superimpose red/
blue line and green one. Adjusting the angle affects the
vertical lines and rotating both magnets affects the hori­zontal lines.

6. Repeat adjustments 3, 4, 5 keeping in mind red, green
and blue movement, because 4-Pole Magnets and 6-Pole
Magnets have mutual interaction and make dot movement
complex.

6-POLE

4-POLE

MAGNETS

MAGNETS

ADJUST THE ANGLE
(VERTICAL LINES)

■ CIRCUMFERENCE CONVERGENCE ADJUSTMENT

1. Loosen the clamping screw of deflection yoke slightly to
allow the yoke to tilt.

2. Temporarily put a wedge as shown in figure 1. (Do not
remove cover paper on adhesive part of the wedge.)

3. Tilt front of the deflection yoke up or down to obtain better
convergence in circumference. (See figure 3.) Push the
mounted wedge into the space between picture tube and
the yoke to fix the yoke temporarily.

4. Put other wedge into bottom space and remove the cover
paper to stick.

5. Tilt front of the yoke right or left to obtain better conver­gence in circumference. (See figure 3.)

6. Keep the yoke position and put another wedge in either
upper space. Remove cover paper and stick the wedge
on picture tube to fix the yoke.

7. Detach the temporarily mounted wedge and put it in an­other upper space. Stick it on picture tube to fix the yoke.

8. After fixing three wedges, recheck overall convergence.
Tighten the screw firmly to fix the yoke and check the yoke
is firm.

9. Stick three adhesive tapes on wedges as shown in figure

1.

FIXED

GENERAL ADJUSTMENTS

ROTATE TWO TABS
AT THE SAME TIME
(HORIZONTAL LINES)

PURITY
MAGNETS

CONVERGENCE MAGNET ASSEMBLY ADJUSTMENT OF MAGNETS

Figure 2.

BLU RED

BLU

RED

4-POLE MAGNETS MOVEMENT

BGR

R
G
B

RGB

RED/BLU

GRN

Center Convergence by Convergence Magnets

B
G
R

RED/BLU GRN

6-POLE MAGNETS MOVEMENT

B
G
R

BGR

RGB

R
G
B

SPECIFIC INFORMATIONS

INCLINE THE YOKE UP (OR DOWN)

Circumference Convergence by DEF Yoke

Figure 3. Dot Movement Pattern

INCLINE THE YOKE RIGHT (OR LEFT)

– 5 –

1. ENTERING TO SERVICE MODE

1) Press o button once on
Remote Control.

SERVICE MODE

2) Press o button again to
keep pressing.

3) While pressing the o button,
press MENU button on TV set.

GENERAL ADJUSTMENTS

2. DISPLAYING THE ADJUSTMENT MENU

1) Press MENU button on TV.

Service mode

3. KEY FUNCTION IN THE SERVICE MODE

The following key entry during display of adjustment menu provides special functions.

SPECIFIC INFORMATIONS

A single horizontal line ON/OFF: - / - - button (on Remote) or a button (on TV)
Test signal selection : a button (on Remote)
Selection of the adjustment items : Channel s/t (on TV or Remote)
Change of the data value : Volume ; +/– (on TV or Remote)
Adjustment menu mode ON/OFF : MENU button (on TV)
Initialization of the memory (QA02) : CALL + Channel button on TV (s)
Reset the count of operating protect

circuit to “00”: CALL + Channel button on TV (t)

“RCUT” selection : 1 button
“GCUT” selection : 2 button
“BCUT” selection : 3 button
“CNTX” (or “SCNT”) selection : 4 button
“COLC” selection : 5 button
“TNTC” selection : 6 button

Test audio signal ON/OFF (1kHz) : 8 button
Self diagnostic display ON/OFF : 9 button

Item

Data

(Service mode display)

Adjustment mode

S

Press

Press

Item

Data

S

Color thickness correction
note: Displayed differently as shown below, de-

pending on the setting of the receiving color
system.
COLP (PAL)
COLC (NTSC)
COLS (SECAM)

CAUTION : Never try to perform initialization unless you have changed the memory IC.

– 6 –

4. SELECTING THE ADJUSTING ITEMS

1) Every pressing of CHANNEL s button in the service mode changes the adjustment items in the order of table-2.
(t button for reverse order)

Refer to table-2 for preset data of adjustment mode.
(See SETTING & ADJUSTING DATA on page 16)

5. ADJUSTING THE DATA

1) Pressing of VOLUME ; +/– button will change the value of data in the range from 00H to FFH. The variable

range depends on the adjusting item.

6. EXIT FROM SERVICE MODE

1) Pressing POWER button to turn off the TV once.

■ INITIALIZATION OF MEMORY DATA OF QA02

After replacing QA02, the following initialization is required.

1. Enter the service mode, then select any register item.

2. Press and hold the CALL button on the Remote, then press the CHANNEL s button on the TV. The initialization of QA02 has
been complated.

3. Check the picture carefully. If necessary, adjust any adjustment item above.
Perform “Auto search Memory” on the owner’s manual.

CAUTION: Never attempt to initialize the data unless QA02 has been replaced.

7. TEST SIGNAL SELECTION

1) Every pressing of a button on the Remote Control changes the built-in test patterns on screen as described below
in SERVICE MODE.

GENERAL ADJUSTMENTS

Signal off

NTSC signals (14 patterns)

PAL signals (14 patterns)

Signals Picture

• Red raster

• Green raster

• Blue raster

• All Black

• All White

• Black & White

• Black cross-bar

• White cross-bar

• Black cross-bar

on green raster

• Black cross-hatch

• White cross-hatch

• Black cross-dot

• White cross-dot

SPECIFIC INFORMATIONS

• H signal (white)

• H signal (black)

The signals marked with are not usable to display in the Test signal for some model.

*

– 7 –

8. SELF DIAGNOSTIC FUNCTION

1) Press “9” button on Remote Control during display of adjustment menu in the service mode.
The diagnosis will begin to check if interface among IC’s are executed properly.

2) During diagnosis, the following displays are shown.

<SELF CHECK>



23******



POWER : 00



BUS LINE : OK



BUS CONT : OK



BLOCK : UV V1 V2
QV01

GENERAL ADJUSTMENTS

Indicated colour of mode now selected : Green and Red
Indicated colour of other modes : White

Green : Normal
Red : The microcomputer operates to provide judgement

of no video signal. The red colour is still indicated
though the signal is input, failure may exist in input
signal line including QV01.

QV01 : In case of indication green ---Normal

In case of indication red with input signal---­Failure may exist in output line including QV01.

 Part number of microcomputer (QA01)
 Operation number of protecting circuit ----“00” is nor-

mal.
When indication is other than “00”, overcurrent apts to
flow, and circuit parts may possibly be damaged.

 BUS LINE CHECK ----“OK” is normal.

“SDA1-GND” ------------- SDA-GND short circuit.
“SCL1-GND” -------------- SCL-GND short circuit.
“SCL1-SDA1” ------------- SCL-SDA short circuit.

 BUS CONT ----“OK” is normal.

When indication shows “Q uuu NG”, the device with

SPECIFIC INFORMATIONS

the number may possibly be damaged.

 BLOCK

UV : TV reception mode
V1 : VIDEO 1 input mode (a1)
V2 : VIDEO 2 input mode (a2)

The items marked with are not usable to display in the SELF DIAGNOSTIC FUNCTION for some model.

*

NOTE: Component which controls character display on

screen is QT01 (TELETEXT IC.). If this display
function fails to operate due to damage in QT01,
self diagnosis procedure is as follows.
(1) In case that power indicator is blinking with

interval of 0.5 seconds; it means protecting cir­cuit (Current limiter) is operating, and circuit
components may possibly be damaged. Check
related components.

(2) In case that power indicator is blinking with

interval of 1 second; Protecting circuit does
not operate, but a part of Bus line does not
operate normally. Check Bus line.

– 8 –

1. ENTERING TO DESIGN MODE

1) Select the Service mode.

DESIGN MODE

2) While pressing o (or CALL) button on
Remote and press MENU button on TV.

3) Press MENU button on TV.

S D

(Design mode) (Adjustment mode)

When QA02 is initialized, items “OPT0” and “OPT1” of DESIGN MODE are set to the data of the representative model of this
chassis family.
Therefore, because ON-SCREEN specification remains in the state of the representative of model. This model is required to
reset the data of items “OPT0” and “OPT1”.

2. SELECTING THE ADJUSTING ITEMS

Every pressing of CHANNEL t button in the design mode changes the adjustment items in the order of table-3.
(s button for reverse order)

Refer to table-3 for data of design mode.
(See SETTING & ADJUSTING DATA on page 16)

3. ADJUSTING THE DATA

Pressing of VOLUME s or t button will change the value of data.

Press

Press

ITEM

DATA

GENERAL ADJUSTMENTS

SPECIFIC INFORMATIONS

– 9 –

ELECTRICAL ADJUSTMENTS

ITEM ADJUSTMENT PROCEDURE

FOCUS VR ADJ

SUB-BRIGHTNESS
(BRTC)

GENERAL ADJUSTMENTS

SPECIFIC INFORMATIONS

Note: Constrict the picture height

until the vertical retrace line
appears adjusting the item
HIT (HEIGHT).

HORIZONTAL POSITION
ADJUSTMENT (HPOS)

VERTICAL POSITION
ADJUSTMENT (VPOS)

1. Enter the service mode, then select any register item.

2. Press the TV/VIDEO button on the Remote until the black cross-bar pattern ap­pears on the screen.

3. Adjust the FOCUS control (on T461) for well defined scanning lines on the picture
screen.

1. Set CONTRAST to minimum, and
BRIGHTNESS to center by adjusting
user controls.

2. Set the TV in service mode to get white
cross-bar of inside pattern.

3. Select BRTC (brightness correction),
and adjust the ; – /+ button to reduce
the value so that white portion of inside
pattern slightly light.

4. Adjust ; – /+ button to increase the
data value of BRTC, and set it just
before the difference between the belt of
vertical retrace and the border of black
portion of inside pattern is visible.
After that, return vertical height and
contrast.

1. Set the TV in service mode, and get
black or white cross-bar signal with
VIDEO button on remote hand unit.

2. Select either HPOS (Horizontal
picture phase) or VPOS (Vertical
picture phase) with CHANNEL s, t
buttons, and adjust horizontal or
vertical picture position in the center
of screen with VOLUME ; – /+
buttons.

Belt of vertical retrace

VERTICAL AMPLITUDE
ADJUSTMENT (HIT)

1. Set the TV in service mode, and get
black or white cross-hatch signal
with VIDEO button on remote hand
unit.

2. Select HIT (Vertical amplitude) with
CHANNEL s, t buttons, and adjust
vertical amplitude with VOLUME
; – /+ buttons so that vertical am­plitude lacks a little.

3. Adjust vertical amplitude with VOL­UME ; – /+ buttons so that the first
bar on cross-hatch signal touches
edge of screen.

– 10 –

The first

ITEM ADJUSTMENT PROCEDURE

WHITE BALANCE
ADJUSTMENT

CUTOFF ADJUSTMENT

•

(RCUT)
(GCUT)
(BCUT)

DRIVE ADJUSTMENT

•

(GDRV)
(BDRV)

NOTE: It is released built-in test pattern by changing the adjustment item for some model.

In this case, select the adjustment item with channel s t buttons first and then select the built-in test pattern with

-/- - button.

1. Set Contrast to 40, and brightness to +20 by picture control.

2. Set the TV in service mode, and get the inside W/B adjusting signal with VIDEO
button.

3. Select RCUT, GCUT and BCUT with CHANNEL s, t buttons, to set individual
values to Initial reference data, and to set GDRV and BDRV to Initial reference
data with VOLUME ; – /+ buttons (See page 16).

4. Press -/- - button on the remote control and rotate Screen VR to get one slight
horizontal line on screen.
Note: Every pressing of -/- - button provides Horizontal line picture and Normal
picture alternately.

5. Press -/- - button to release horizontal line picture, and select the two other
colours which did not light in the above step with CHANNEL s, t buttons. Then
tap VOLUME ; – /+ buttons so that three colours slightly light in the same level.

X To correct white balance in light area,

select GDRV and BDRV with CHANNEL
s, t buttons to adjust.

X To correct white balance in dark area,

perform fine adjustment of RCUT, GCUT
and BCUT.

GENERAL ADJUSTMENTS

Light area check

(to show white)

Dark area check

(to show black)

SPECIFIC INFORMATIONS

– 11 –

S1E: Series (Reference factory adjustment)

1 AFT/AGC ADJUSTMENT

(Measuring point) TP-13/TP-14
(Input frequency) CW: 38.00 [MHz] 95dBµV at 75Ω load
(Adjusting method)

1) Open link of IF out.

2) Input 1000pf cap. to link at tuner side to ground.

3) Input frequency after link. CW: 38.00 [MHz] 95dBµV at 75Ω load

4) Power On

5) Select RFAGC key, on screen display "RAGC OK, Coil OK"

6) If both display OK, adjustment finish; If any one display NG contine as follow

7) Press "0" key display "COIL PRESET"

8) Adjust L161 to 2.5 V±0.5V at TP13

GENERAL ADJUSTMENTS

9) Press "0" key display "COIL OK"

10) Press RFAGC key on screen display "REAGC ADJUSTING" for 3 secs only

11) DVM display 2.0±1.0V at TP14

12) On screen display "RFAGC OK, Coil OK"

13) Power Off.

AFT SPEC : 2.5±0.5V (TP13)
AGC SPEC: 2.0±1.0V (TP14)

2 SUB COLOUR CONTRAST (SCNT)

(Measuring point)
(Adjusting signal) NO ADJUSTMENT
(Adjusting method)

SPECIFIC INFORMATIONS

3 SUB BRIGHT (BRTC)

(Adjusting signal) Sub Bright (PAL or NTSC) signal.
(Adjusting method)

1) Set user control to the standard 1.

2) Change BRTC data to set black collapse numbers by eye check.

SPEC 4±1.5 bars

*Note: This item to adjust last

4 SUB COLOUR CENTER (COLP)

(Measuring point)
(Adjusting signal) NO ADJUSTMENT
(Adjusting method)

5 SUB TINT CENTER (FOR M-NTSC MODEL) (TNTC)

(Measuring point) Q501 #22 (B-OUT)
(Adjusting signal) Sub Bright (NTSC) signal *Note: For Thailand model use Video input
(Adjusting method) Change TNTC data to adjust the 5th pointion to the 6th level of B-Y signal and the 7th level differ-

ence should regulate to 2:1

–5°

1

2

#5 #6 #7

SPEC: –5.0°±5°

*Note: This ITEM Adjust before (COLC)

– 12 –

6 SUB COLOUR NTSC (COLC)

(Measuring point) Q501 #22 (B-OUT)
(Adjusting signal) Sub Bright (NTSC) signal *Note: For Thailand model use Video input
(Adjusting method)

1) Set BUS date of Q501 to the same value as that SUB TINT adjustment.

2) Set user control to the standard 1.

3) Change COLC data to adjust the 6th peak amplitude of rainbow colour bar.

4) Adjust the amplitude of colour bar.
(p-p value of the upper half)

Value

1.4±0.2 Vpp

7 WHITE BALANCE ADJUSTMENT

(Adjusting method)

1) Set user control to the standard 1

2) BUS date of Q501
GDRV→Initial value (40H)
BDRV→Initial value (40H)
RCUT→Initial value (20H)
GCUT→Initial value (20H)
BCUT→Initial value (20H)

3) Set the mode to the one horizontal line mode
MUTE
BRIGHT

4) Change SCREEN VR to set it so that one of the line R, G and B will light slightely

5) Change CUT-OFF data to set it so that each one of R, G and B will light slighty (for about white)

6) Release the H.Line mode.

7) Change B/G drive data and R/G/B CUT-OFF data to adjust white balance in bright area and dark area.
* Bright area (High-light area): 30FL
* Dark area (Low light area): 4FL

GENERAL ADJUSTMENTS

SPECIFIC INFORMATIONS

SPEC Hight-light area: 11500°K+0.0075uv

Low-lignt area: 10500°K+0.0150uv

8 SUB COLOUR CENTER (COLS) (SECAM) (For models M, MJ, R, TR only)

(Measuring point) Q501 #22 (B-OUT)
(Adjusting signal) SECAM COLOUR BAR
(Adjusting method) Adjusting the amplitude of B-Y (Mute the picture in adjustment)

Value

Spec: 1.75±0.2V

– 13 –

9 SECAM BELL FILTER ADJUSTMENT

(Measureing point)
(Adjusting signal) NO ADJUSTMENT
(Adjusting method)

10 SECAM R-Y ADJUSTMENT (For models M, MJ, R, TR only)

(Measuring point) Q501 #20 R-Y OUT
(Adjusting signal) Colour bar (SECAM) signal
(Adjusting method) Adjust (SRY) the level of the monochrome signal part must be a match to the level of horizontal

Spec: 0±10 mVpp

11 SECAM B-Y ADJUSTMENT (For models M, MJ, R, TR only)

GENERAL ADJUSTMENTS

SPECIFIC INFORMATIONS

(Measureing point) Q501 #22 R-Y OUT
(Adjusting signal) Colour bar (SECAM) signal
(Adjusting method) Adjust (SBY) the level of the monochrome signal part must be a match to the level of horizontal

Spec: 0±10 mVpp

12 VERTICAL POSITION

(Input signal) WG Philip Pattern (Do not use French SECAM)
(Measurement place) On Picture
(Setting) Contrast=Max. Bright=Center. Colour=Center
(Adjusting method) Adjust VPOS upper and lower position on Philips pattern may become a center. (Turn the direction of

13 VERTICAL HEIGHT

(Input signal) WG Philip Pattern (Do not use French SECAM)
(Measurement place) On Picture
(Setting) Contrast=Max. Bright=Center Colour=Center
(Adjusting method) Adjust the Sub address HIT on Philips pattern may hide frag of the upper and lower side in exactly.

blanking signal.

blanking signal.

CPT to the south or the north when adjusting. Adjust the amount offsetting if it is not possible to do)

14 HORIZONTAL POSITION

(Input signal) WG Philip Pattern (Do not use French SECAM)
(Measurement place) On Picture
(Setting) Contrast=Max. Bright=Center Colour=Center
(Adjusting method) Adjust the sub address HPOS on Philips pattern may become the center location (Minimize D-C in

the adjustment magnetic field on CPT.)

– 14 –

CIRCUIT CHECK

HIGH VOLTAGE CHECK
CAUTION: There is no HIGH VOLTAGE ADJUSTMENT on this chassis. Checking should be done following the steps

below.

1. Connect an accurate high voltage meter to the second anode of the picture tube.

2. Turn on the receiver. Set the BRIGHTNESS and CONTRAST controls to minimum (zero beam current).

3. High voltage must be measured below (B) kV.

Refer to table-1 for high voltage (B).
(See SETTING & ADJUSTING DATA on page 16)

4. Vary the BRIGHTNESS control to both extremes to be sure the high voltage does not exceed the limit under any conditions.

GENERAL ADJUSTMENTS

SPECIFIC INFORMATIONS

– 15 –