Toshiba 20A1VX User manual

SERVICE MANUAL
COLOUR TELEVISION
Dec., 2003
FILE NO. 040-200116
S8ER Chassis
20A1VX

– 2 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
TABLE OF CONTENTS
CHAPTER 1 GENERAL ADJUSTMENTS
SAFETY INSTRUCTIONS ........................................................................................................................................ 3
SET-UP ADJUSTMENT ............................................................................................................................................ 4
SERVICE MODE ...................................................................................................................................................... 6
DESIGN MODE ........................................................................................................................................................ 9
ELECTRICAL ADJUSTMENT ................................................................................................................................ 10
CIRCUIT CHECK .................................................................................................................................................... 17
CHAPTER 2 SPECIFIC INFORMATIONS
SETTING & ADJUSTING DATA .............................................................................................................................. 18
LOCATION OF CONTROLS ................................................................................................................................... 19
PROGRAMMING CHANNEL MEMORY................................................................................................................. 20
CHASSIS AND CABINET REPLACEMENT PARTS LIST ......................................................................................21
PC BOARDS BOTTOM VIEW................................................................................................................................. 27
TERMINAL VIEW OF TRANSISTORS ................................................................................................................... 29
CIRCUIT BLOCK DIAGRAM .................................................................................................................................. 32
SPECIFICATIONS .............................................................................................................................................. END
APPENDIX:
CIRCUIT DIAGRAMS

–3 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
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 volt-
age 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 cir-
cumstances, exceed (B) kV.
Refer to table-1 for high voltage (A), (B) & AC voltage (C)
(See SETTING & ADJUSTING DATA on page 18)
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 read-
ing 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.
2. The only source of X-RAY RADIATION in this TV receiver
is the picture tube. For continued X-RAY RADIATION pro-
tection, 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 char-
acteristics for X-RAY RADIATION protection. For contin-
ued safety, parts replacement should be undertaken only
after referring to the PRODUCT SAFETY NOTICE below.
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 char-
acteristics 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.
WARNING : Service should not be attempted by anyone unfamiliar with the necessary precautions on this receiver. The follow-
ing 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; non-
metallic control knobs, insulating covers, shields, isolation resistor-capacitor network etc.
SAFETY PRECAUTION
PRODUCT SAFETY NOTICE

–4 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
WARNING: BEFORE SERVICING THIS CHASSIS, READ THE “X-RAY RADIATION PRECAUTION”, “SAFETY PRECAU-
TION”AND “PRODUCT SAFETY NOTICE”ON PAGE 3 OF THIS MANUAL.
SET-UP ADJUSTMENT
■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. Color Purity
2. Convergence
3. White Balance
Note: The PURITY/CONVERGENCE MAGNET assembly and rubber wedges need mechanical positioning.
Refer to figure 1.
*There are no adjustment of purity and convergence in some picture tube (Unified with purity magnet)
GLASS CLOTH
TAPES
DEFLECTION
YOKE
TEMPORARY
MOUNTING
RUBBER WEDGE
ADHESIVE
DEFLECTION
YOKE
PURITY/
CONVERGENCE
MAGNET ASS'Y
29.1mm(28", 29")
25mm(25")
19mm(19", 20", 21")
14mm(13", 14")
Figure 1.
COLOR PURITY ADJUSTMENT
NOTE : Before attempting any purity adjustments, the receiver
should be operated for at least fifteen minutes.
1. Demagnetize the picture tube and cabinet using a degauss-
ing coil.
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
yoke backward or forward to provide vertical green belt
(zone) in the picture screen.
5. Remove the Rubber Wedges.
6. Rotate and spread the tabs of the purity magnet (See fig-
ure 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.

–5 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
CONVERGENCE ADJUSTMENTS
NOTE: Before attempting any convergence adjustments, the
receiver should be operated for at least fifteen min-
utes.
■CENTER CONVERGENCE ADJUSTMENT
1. Use the cross-dot pattern from among the built-in test sig-
nals.
2. Set the brightness and contrast for well defined pattern.
3. Adjust two tabs of the 4-Pole Magnets to change the an-
gle 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 hori-
zontal 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.
■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 conver-
gence 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 an-
other 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.
4-POLE
MAGNETS
PURITY
MAGNETS
6-POLE
MAGNETS
ADJUST THE ANGLE
(VERTICAL LINES) FIXED
ROTATE TWO TABS
AT THE SAME TIME
(HORIZONTAL LINES)
CONVERGENCE MAGNET ASSEMBLY ADJUSTMENT OF MAGNETS
Figure 2.
BLU RED
BLU
RED
RED/BLU GRN
RED/BLU
GRN
B
G
R
R
G
B
BGR
RGB
BGR
RGB
R
G
B
B
G
R
4-POLE MAGNETS MOVEMENT
INCLINE THE YOKE UP (OR DOWN)
6-POLE MAGNETS MOVEMENT
Center Convergence by Convergence Magnets
Circumference Convergence by DEF Yoke
INCLINE THE YOKE RIGHT (OR LEFT)
Figure 3. Dot Movement Pattern

–6 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
SERVICE MODE
1. ENTERING TO SERVICE MODE
3) While pressing the obutton,
press MENU button on TV set.
2) Press obutton again to
keep pressing.
2. DISPLAYING THE ADJUSTMENT MENU
1) Press MENU button on TV.
3. KEY FUNCTION IN THE SERVICE MODE
The following key entry during display of adjustment menu provides special functions.
A single horizontal line ON/OFF: - / - - button (on Remote) or abutton (on TV)
Test signal selection : abutton (on Remote)
Selection of the adjustment items : CHANNEL s/t(on TV & Remote)
Change of the data value : VOLUME ;+/–(on TV & 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
1) Press obutton once on
Remote Control.
Adjustment mode
Item
Data
Service mode
S
Press
Press
ITEM
DATA
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.
S
(Service mode display)
Item
Data

–7 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
4. SELECTING THE ADJUSTING ITEMS
1) Every pressing of CHANNEL sbutton in the service mode changes the adjustment items in the order of table-2.
(tbutton for reverse order)
Refer to table-2 for preset data of adjustment mode.
(See SETTING & ADJUSTING DATA on page 18)
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 sbutton 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
Every pressing of abutton on the Remote Control changes the built-in test patterns on screen as described below in
SERVICE MODE.
Signals Picture
•Red raster
•Green raster
•Blue raster
•All Black
•All White
•Black & White
•Black cross-hatch
•White cross-hatch
•Black cross-dot
•White cross-dot
•Black cross-bar
•White cross-bar
•Black cross-bar
on green raster
•H signal (white)
•H signal (black)
*The signals marked with are not usable to display in the Test signal for some model.
Signal off NTSC signals (14 patterns)
PAL signals (14 patterns)

–8 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
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.
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.
“SCL(SCL1)-GND”............... SCL-GND short circuit
“SDA(SDA1)-GND”.............. SDA-GND short circuit
“SCL(SCL1)-SDA (SDA1)”... SCL-SDA short circuit
BUS CONT ----“OK”is normal.
When indication shows “Q uuu NG”, the device with
the number may possibly be damaged.
BLOCK ----“OK”is normal.
UV : TV reception mode
V1 : VIDEO 1 input mode (a1)
V2 : VIDEO 2 input mode (a2)
Indicated color of mode now selected : Green and Red
Indicated color of other modes : White
Green : Normal
Red : The microcomputer operates to provide judgement
of no video signal. The red color 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.
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 cir-
cuit 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.
*The items marked with are not usable to display in the SELF DIAGNOSTIC FUCTION for some model.






–9 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
DESIGN MODE
1. ENTERING TO DESIGN MODE
ITEM
DATA
S D Press
(Design mode) (Adjustment mode)
Press
3) Press MENU button on TV.
2) While pressing o(or CALL) button on
Remote and press MENU button on TV.
1) Select the Service mode.
2. SELECTING THE ADJUSTING ITEMS
Every pressing of CHANNEL tbutton in the design mode changes the adjustment items in the order of table-3.
Refer to table-3 for data of design mode.
(See SETTING & ADJUSTING DATA on page 18)
3. ADJUSTING THE DATA
Pressing of VOLUME sor t(;+/–) button will change the value of data.
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”.

–10 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
ELECTRICAL ADJUSTMENT
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 ap-
pears on the screen.
3. Adjust the FOCUS control (on T461) for well defined scanning lines on the picture
screen.
FOCUS VR ADJ.
SUB-BRIGHTNESS
(BRTC)
Note: Constrict the picture height
until the vertical retrace line
appears adjusting the item
HIT (HEIGHT).
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.
ITEM ADJUSTMENT PROCEDURE
Belt of vertical retrace
HORIZONTAL POSITION
ADJUSTMENT (HPOS)
VERTICAL POSITION
ADJUSTMENT (VPOS)
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.
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, tbuttons, and adjust
vertical amplitude with VOLUME
;–/+ buttons so that vertical am-
plitude lacks a little.
3. Adjust vertical amplitude with VOL-
UME ;–/+ buttons so that the first
bar on cross-hatch signal touches
edge of screen.
The first

–11 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
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, tbuttons, to set individual
values to 20, and to set GDRV and BDRV to 80 with VOLUME ;–/+ buttons.
4. Press VIDEO button on TV set and rotate Screen VR to get one slight horizontal
line on screen.
Note: Every pressing of VIDEO button provides Horizontal line picture and Normal
picture alternately.
5. Press VIDEO button to release horizontal line picture, and select the two other
colors which did not light in the above step with CHANNEL s, tbuttons. Then tap
VOLUME ;–/+ buttons so that three colors slightly light in the same level.
XTo correct white balance in light area,
select GDRV and BDRV with CHANNEL
s, tbuttons to adjust.
XTo correct white balance in dark area,
perform fine adjustment of RCUT, GCUT
and BCUT.
ITEM ADJUSTMENT PROCEDURE
WHITE BALANCE
ADJUSTMENT
•CUTOFF ADJUSTMENT
(RCUT)
(GCUT)
(BCUT)
•DRIVE ADJUSTMENT
(GDRV)
(BDRV)
Light area check
(to show white)
Dark area check
(to show black)

–12 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
Item. [AFT.f0]
Name. AFT.f0
SETTING. IF.OUT pin (H001) 1000pF load. (IF out Round open)
Input signal. SIGNAL : CW F=38.0M 95dB (µV) (75 Ωload)
Measurement place. TP-13
Adjustment method. Adjust L161 at the point that have critical change of voltage.
Making standard. STANDERD : 2.5V±0.5V
NOTE : The place which detecter high and low.
Item. [RAGC]
Name. RF AGC DELAY
SETTING. IF OUT pin (H001) 1000pF load. (IF out Round open)
Input signal. CW F=38.0M 95dB (µV) (75 Ωload)
Measurement place. TP-15
Adjustment method. Adjust the sub address [RAGC]
Making standard. 4.0V±2V
Item. [SCNT] NO ADJUSTMENT
Name. SUB-CONTRUST
SETTING.
Input signal.
Measurement place.
Adjustment method.
Making standard.
Item. [BRTC]
Name. SUB-BRIGHT CENTER
SETTING. Set user control setting to STANDERD 1
Input signal. SUB-BRIGHT SIGNAL
Measurement place. On picture
Adjustment method. It is black step of the (*sub-bright*) signal and adjust the number.
Making standard. 4±1.5 bars
*Note : Adjust at last
S8ER: series (Reference factory adjustments)

–13 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
Item. [COLP] NO ADJUSTMENT
Name. SUB-COLOR CENTER (PAL)
SETTING.
Input signal.
Measurement place.
Adjustment method.
Making standard.
Item. [TNTC]
Name. SUB-TINT CENTER (For M-NTSC MODEL)
SETTING. CHROMA ADJUSTMENT MODE
Input signal. SUB-BRIGHT SIGNAL (NTSC)
Measurement place. Q501 #20 (B OUT)
Adjustment method. The 5th position to the 6th level of B-Y signal and the 7th level difference should regu-
late to 2:1.
Making standard. –5.0˚±5˚
Note : Adjust before [COLC]
Item. [COLC]
Name. SUB-COLOR CENTER (NTSC/PAL)
SETTING. CHROMA ADJUSTMENT MODE
Input signal. SUB-BRIGHT SIGNAL (NTSC) For M-NTSC MODEL
SUB-BRIGHT SIGNAL (PAL) For OTHER MODEL
Measurement place. Q501 #20 (B OUT)
Adjustment method. Adjust the amplitude of B-Y.
Making standard. 1.35 ±0.2V(p-p)
2.0 1.0
567

–14 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
Item. [RCUT], [GCUT], [BCUT], [GDRV], [BDRV], [SCREEN VR]
Name. CUT OFF/DRIVE ADJUST
SETTING. [RCUT], [GCUT], [BCUT] each data set = 20H
[GDRV], [BDRV] each data set = 40H
Set to White line mode
Input signal. White signal
Measurement place. On picture.
Adjustment method.
Raise screen VR gradually and stop in the place where the line of either of R or G or B shines slightly. Decide
the position of screen VR there.
Raise the CUT-OFF data other than the line which shines by first gradually shine point.
Stop in the place which shines in most white. Make clear white line mode.
Adjust it repeatedly for both the shade part and discernment to become a correct numerical value by using
proofread CA100.
Making standard.
103cd/m211500K +0.0075uv 17cd/m210500K +0.0105uv (Except XR MODEL)
103cd/m28750K –0.0020uv 17cd/m28750K –0.0020uv (XR MODEL)
EG.DEPT STD CA-100
light dark light dark
X 271 271 299 299
Y 276 281 302 302
(Except XR MODEL) (XR MODEL)

–15 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
Item. [BELL] NO ADJUSTMENT
Name. BELL FILTER
SETTING.
Input signal.
Measurement place.
Adjustment method.
Making standard.
Item. [SRY]
Name. SECAM R-Y BLACK LEVEL. SETTING
Input signal. SECAM COLOR BAR.
Measurement place. Q501 #18 (R-out)
Adjustment method. Adjust [SRY] the level of the monochrome signal part must be a match to the level of
horizontal blanking signal.
(Adjust this item after adjust [COLS])
Making standard. 0±40mV (p-p)
Item. [SBY]
Name. SECAM B-Y BLACK LEVEL.
SETTING.
Input signal. SECAM COLOR BAR.
Measurement place. Q501 #20 (B-out)
Adjustment method. Adjust [SBY] the level of the monochrome signal part must be a mutch to the level of
horizontal blanking signal.
(Adjust this item after adjust [COLS])
Making standard. 0±40mV (p-p)
Item. [COLS]
Name. SUB-COLOR CENTER (SECAM).
SETTING. CHROMA ADJUSTMENT MODE
Input signal. SECAM COLOR BAR.
Measurement place. Q501 #20 (B OUT)
Adjustment method. Adjust the amplitude of B-Y. (Mute the picture in adjustment)
Making standard. 1.75±0.2V (0-p)
FOR SECAM MODEL ONLY

–16 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
Item. [VERT POSITION]
SETTING. CONTRAST=MAX. BRIGHT=CENTER COLOR=CENTER
Input signal. WG Philips Pattern (Do not use French SECAM).
Measurement place. On Picture
Adjustment method. Adjust [VPOS] upper and lower position in Philips pattern may become a center._(Turn
the direction of CPT to the south or the north when adjusting. Adjust the amount offsetting if it is not possible
to do.)
Item. [V-HEIGHT]
SETTING. CONTRAST=MAX. BRIGHT=CENTER COLOR=CENTER
Input signal. WG Philips Pattern (Do not use French SECAM).
Measurement place. On Picture
Adjustment method. Adjust the sub address [HIT] of Philips pattern may hide frag of the upper and lower
sides in exactly.
Item. [HORIZONTAL POSITION]
SETTING. CONTRAST=MAX. BRIGHT=CENTER COLOR=CENTER
Input signal. WG Philips Pattern (Do not use French SECAM).
Measurement place. On Picture
Adjustment method. Adjust the sub address [HPOS] of Philips pattern to center.
(Minimize D-C in the adjustment magnetic field on CRT.)

–17 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
CIRCUIT CHECKS
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 18)
4. Vary the BRIGHTNESS control to both extremes to be sure the high voltage does not exceed the limit under any conditions.

– 18 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
SETTING & ADJUSTING DATA
20”
HIGH VOLTAGE AT ZERO BEAM: (A) 25.7 kV
MAX HIGH VOLTAGE: (B) 27.5 kV
AC VOLTAGE : (C) 110 V–240 V
CHAPTER 2 SPECIFIC INFORMATIONS
SAFETY INSTRUCTIONS
Table-1
RCUT
GCUT
BCUT
GDRV
BDRV
CNTX
BRTC
COLC
TNTC
COLP
COLS
SCNT
R CUTOFF
G CUTOFF
B CUTOFF
G DRIVE
B DRIVE
SUB CONTRAST MAX
SUB BRIGHT CEN
SUB COLOR CEN NTSC
SUB TINT CEN
SUB COLOR CEN PAL
SUB COLOR CEN SECAM
Y-SUB CONTRAST
20H
20H
20H
40H
40H
3FH
40H
40H
40H
00H
40H
08H
SERVICE MODE
ADJUSTING ITEMS AND DATAS IN THE SERVICE MODE:
DESIGN MODE
ADJUSTING ITEMS AND DATAS IN THE DESIGN MODE:
Data
Item Name of adjustment Preset Data Remarks
Table-3
* There are no adjustment in the DESIGN MODE.
Table-2
Item Adjustments Reference data Item Adjustments Reference data
HPOS
VPSO
HIT
VLIN
VSC
SBY
SRY
RAGC
PWR
BUS
MEM
50Hz HORIZONTAL POSITION
VERTICAL POSITION
HIT
V-LINEARITY
V-S CORRECTION
SECAM B-Y
SECAM R-Y
RF AGC
CURR LIMIT
BUS LINE
MEMORY CHECK
11H
03H
20H
08H
00H
08H
08H
30H
00H
00H
00H

–19 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
CALL
–/--
1
4
7
2
5
8
0
3
6
9
MENU
MENU
CH
VIDEO AUDIO
LOCATION OF CONTROLS
Front
Power switch
Remote sensor
Power Indicator
Channel select
Volume down/up
VIDEO input terminal
Audio inpuit terminal
Earphone jack
MENU
TV/VIDEO Select
Digit Select
Menu open
mute
Power ON/OFF
Direct Select
TV/VIDOE Select
Volume down/up
Level down/up
Picture control
Menu Select
on-screen on/off
Position down/up
Level down/up
Remote control

–20 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
PROGRAMMING CHANNEL MEMORY
Auto search memory (ASM)
All the channels that can be received are preset automati-
cally.
1Select the position for starting ASM, (0~9) or ( / ).
2Set the correct broadcast system for your region.
Press (MENU) repeatedly to call up the SET UP menu
on the upper right of the screen.
And set COLOR to AUTO and select the SOUND ac-
cording to the table below by (t/s) and (–/+).
3Select ASM, then press (+) to start the ASM. Return to
the start position. This completes the procedure.
Skip function
If you set SKIP ON for unnecessary position numbers, when
you select channels with ( /), that position is skipped.
Example
Skipping position 13
1Select Position 13.
Press ( /) repeatedly until 13 is displayed.
Or, press (–/––) once or twice to display ––on the
screen. Press 1 and 3 on Remote in that order.
2Press (MENU) several times to display the SET UP
menu screen. Press (t/s) to select the item “SKIP”.
Press (–/+) to switch from OFF to ON. This completes
the setting.
To turn off the menu function display instantly
Press the (CALL) button.
Note •When SKIP is on, “∗”is added to the left of the position
number. Example: ∗13
Select position 13 with (–/––) and (1, 3) to confirm
“∗”mark.
•If you want to restore a skipped position number, se-
lect the skippied position number with (–/––) and (1,
3) buttons and Switch from ON to OFF on step 2 above.
Manual fine tuning (MFT)
Press (MENU) several times to display the SET UP menu
screen.
Press (t/s) and select MFT. Press (–/+) to start fine tuning.
Pressing “–” fine tunes to a lower frequency; pressing “+”fine
tunes to a higher frequency.
To turn off the menu function display instantly
Press the (CALL) button.
X Please refer to the owner's manual in detail.
Method 1 —When Channel 12 is not preset to either
channel→Manual Search
1Select Position 12.
Press ( /) repeatedly until 12 is displayed.
Or, press (–/––) once or twice to display ––on the
screen. Press 1 and 2 on Remote in that order.
2Press (MENU) several times to display the SET UP
menu screen.
Press (t/s) and select “>>>”. Press (–/+) to search.
Pressing “–” searches lower frequency channel; press-
ing “+”searches higher frequency channels.
3When Channel 12 is set, press (t/s) to select “ ”.
Press “+”(–/+) to complete the presetting.
To turn off the menu function display instantly
Press the (CALL) button.
Method 2 —Store position
1Press (0~9) or ( /) to find the position preset for
Channel 12.
2When Channel 12 is set, press (MENU) several times
to display the SET UP menu screen. Press (t/s) to
select the item “POSITION”. And press (–/+) repeatedly
to set the position number “P12”. Pressing “–” displays
a smaller number; pressing “+”displays a larger number.
3When Position 12 is set, press (t/s) to select the item
“ ”. Press “+”(–/+) to complete the presetting.
To turn off the menu function display instantly
Press the (CALL) button.
Manual Search and Changing the assigned position
Example
Presetting Channel 12 to Position 12