Toshiba 20N7XE User manual

TOSHIBA CORPORATION
1-1, SHIBAURA 1- CHOME, MINATO-KU, TOKYO 105-8001, JAPAN
PRINTED IN JAPAN, Jan., 2001 T
SERVICE MANUAL
COLOUR TELEVISION
S9S Chassis
FILE NO. 060-200101
20N7XE
To CTV

– 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
CIRCUIT BLOCK DIAGRAM ..................................................................................................................................21
CHASSIS AND CABINET REPLACEMENT PARTS LIST......................................................................................22
PC BOARDS BOTTOM VIEW.................................................................................................................................29
TERMINAL VIEW OF TRANSISTORS ...................................................................................................................33
SPECIFICATIONS ..................................................................................................................................................37
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 hazard-
ous 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
beamcurrent(minimumbrightness)undera(C)V AC power
source. The high voltage must not, under any circum-
stances, 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 HIGHVOLTAGE CHECK
procedurein thismanual. It isrecommended thatthe 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 specialsafety-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 charac-
teristics 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.
• Mounting position of the purity magnet assembly should fit to same position as old one because slightly difference
to the position depend on a tube.
*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 : Beforeattemptingany purityadjustments, the receiver
should be operated for at least fifteen minutes.
1. Demagnetizethe picturetubeand cabinetusinga 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
Magnetshave mutual interactionand makedot 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.
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
3. KEY FUNCTION INTHE 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 : 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

– 7 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
4. SELECTINGTHE 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 CHANNELsbutton 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.
Whenindication shows “Quuu NG”, thedevice 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 : Themicrocomputer operatesto provide judgement
of no video signal. The red color is still indicated
thoughthe 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.
23******
POWER : 00
BUS LINE : OK
BUS CONT : OK
BLOCK : UV V1 V2
(or SYNC) QV01 QV01S


<SELF CHECK>






– 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 (onT461) for well defined scanning lines on the picture
screen.
FOCUS VR ADJ.
SUB-BRIGHTNESS
(BRTC)
Note: Constrict thepicture height
untilthe vertical retraceline
appears adjusting the item
HIT (HEIGHT).
1. Set CONTRAST to minimum, and
BRIGHTNESSto centerbyadjusting 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 pat-
tern slightly light.
4. Adjust;– /+ buttontoincrease the data
value of BRTC, and set it just before the
difference between the belt of vertical re-
trace and the border of black portion of
inside pattern is visible.
After that, return vertical height and con-
trast.
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 pic-
turephase) orVPOS(Vertical picture
phase) with CHANNEL s,tbuttons,
and adjust horizontal or vertical pic-
ture position in the center of screen
with VOLUME ;– /+ buttons.
VERTICAL AMPLITUDE
ADJUSTMENT (HIT) 1. Set the TV in service mode, and get black orwhite cross-hatch signalwith
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 ofVIDEO 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,
selectGDRV andBDRVwithCHANNEL
s, tbuttons to adjust.
XTo correct white balance in dark area,
performfine adjustmentof 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
V
SPEC V p-p
MODEL: S9S Series (Reference factory adjustments)
Adjust the amplitude of color bar
(p-p value of the upper half)
NO ADJUSTMENT
1. SUB CONTRAST
(Measuring point) Q501 #14 R-OUT
(Adjusting signal) Sub Bright (NTSC) signal
(Adjusting method)
1. BUS data of Q501
RCUT (Q501 SUB ADDR:0C) →Initial value (20H)
Yγ(Q501 SUB ADDR:08/D7) →OFF (0)
WPL (Q501 SUB ADDR:08/D6) →OFF (1)
PACL (Q501 SUB ADDR:08/D5) →OFF (0)
COLOR (Q501 SUB ADDR:02/D7-DC) →MIN (00H)
2. Set user control to the standard 1
3. Change to adjust SCNT data (Q501 SUB ADDR:05/D4~D0).
XIt makes the point which doesn't have a change and it adjust with screen VR.
4. After adjustment, return the data which are set in steps 1, 2 above, to original data.
2. SUB COLOR PAL (THIS ADJUSTMENT AFTER SUB COLOR NTSC)
(Measuring point) Q501 #12 B-OUT
(Adjusting signal ) Sub Bright (PAL) signal
(Adjusting method)
1. Set BUS data of Q501 to the same value as that of SUB TINT adjustment.
2. Set user control to the standard 1.
3. Change COLP data (COLC Difference data) to adjust the 6th peak amplitude of rainbow color bar.
4. After adjustment return the data set in steps 1,2 above, to the original data.
1.3 ±0.2 V p-p

– 13 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
NO ADJUSTMENT
3.SUB COLOR SECAM (THIS ADJUSTMENT AFTER SUB COLOR NTSC)
(Measuring point) Q501 #12 B-OUT
(Adjusting signal) SECAM color bar signal
(Adjusting method)
1. Set BUS data of Q501 to the same value as that of SUB TINT adjustment.
2. Set user control to the standard 1.
3. Change COLS data (COLC Difference data) to adjust the peak amplitude of SECAM
color bar.
4. After adjustment, return the data set in steps 1, 2 above to the original data.
[A]V[B]V
V p-p
Adjust the amplitude of color bar.

– 14 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
4. SUB TINT
(Measuring point) Q501 #12 B-OUT
(Adjusting signal) Sub Bright (NTSC) signal
(Adjusting method)
1. BUS data of Q501
BDRV (Q501 SUB ADDR:0A) →Initial value (80H)
BCUT (Q501 SUB ADDR:0E) →Initial value (20H)
COLOR LIMITER (Q501 SUB ADDR:0F/D2) →OFF (0)
MUTE (Q501 SUB ADDR:1B/D7~D6) →Y mute (10)
P/N CD ATT (Q501 SUB ADDR:12/D5~D4) →0dB (01)
S-field (Q501 SUB ADDR:1F/D7) →OFF (0)
SCD ATT (Q501 SUB ADDR:1F/D6) → 0dB (0)
P-ACL (Q501 SUB ADDR:18/D5) →OFF (0)
2. Set user control to the standard 1
3. Change to adjust TNTC data (Q501 SUB ADDR:03/D6D0) so that difference between 6th peak and 5th and 7th
peaks of rainbow color bar becomes 2:1.
4. After adjustment, return the data which are set in steps 1, 2 above, to original data.
5. SUB COLOR NTSC
(Measuring point) Q501 #12 B-OUT
(Adjusting signal) Sub Bright (NTSC) signal
(Adjusting method)
1. Set BUS data of Q501 to the same value as that of Sub TINT adjustment.
2. Set user control setting to the standard 1
3. Change COLC data (Q501 SUB ADDR:02/D7~D0) to adjust the 6th peak amplitude of rainbow color bar.
4. After adjustment, return the data set in steps 1 and 2 above, to the original.
0°
11
#5 #6 #7
–5°
21
#5 #6 #7
–10°
51
#5 #6 #7
–5 ±5 (˚ )
V
1.3 ±0.2 V p-p
Adjust the amplitude of color bar.
(p-p value of the upper half)

– 15 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
SPEC 4 ±1.5 BARS
6. SUB BRIGHT
(Adjusting signal) SUB Bright (PAL or NTSC) signal
(Adjusting method)
1. Set user control setting to the standard 1.
2. Change BRTC data (Q501 SUB ADDR:01/D7D0) to set black collapse numbers by eye check.
7.WHITE BALANCE ADJUSTMENT
(Adjusting method)
1. Set user control setting to the standard 1.
2. BUS data of Q501
GDRV (Q501 SUB ADDR:09) →Initial value (80H)
BDRV (Q501 SUB ADDR:0A) →Initial value (80H)
RCUT (Q501 SUB ADDR:0C) →Initial value (20H)
GCUT (Q501 SUB ADDR:0D) →Initial value (20H)
BCUT (Q501 SUB ADDR:0E) →Initial value (20H)
3. Set the mode to the one horizontal line mode
MUTE (Q501 SUB ADDR:1B/D7~D6) →H. Line (11)
BRIGHT (Q501 SUB ADDR:01) →Initial value (80H)
4. Change SCREEN VR to set it so that one of lines R, G and B will light slightly.
5. Change CUTOFF data to adjust so that each one of R, G and B will light slightly (for about white).
6. Release the H. Line mode.
7. Change B/G drive data and R/G/B CUTOFF data to adjust white balance in bright area and dark area.
NO ADJUSTMENT
8. SECAM BELL FILTER ADJUSTMENT
(Measuring point) Q501 #36 B-Y OUT
(Adjusting signal) Color bar (SECAM) signal
(Adjusting method)
1. Connect resistor 1k ohm between color limiter terminal (Q501 #26) and 5V.
2. Connect resistor 100 ohm between Q501 #35 and 5V.
3. Set COLOR control data to "04H".
4. Set MICOM YS output to "H", and set Q501 to DIGITAL RGB mode.
5. Change BELL data (Q501 SUB ADDR:ifD1D0) to set it so that SECAM signal at #36 pip of
Q501 (B-Y OUT) can be flat.
6. After adjustment, remove resistor 1k ohm between color limiter terminal (Q501 #26).
and 5V, and remove resistor 100 ohm between Q501 #35 and 5V, to return COLOUR control.
data to original.
W
SPEC %
Make flat the white part

– 16 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
SPEC B-Y/R-Y mV p-p
NO ADJUSTMENT
9. SECAM OFFSET ADJUSTMENT
(Measuring point) Q501#35 R-Y OUT
#36 B-Y OUT
(Adjusting signal) Color bar (SECAM) signal
(Adjusting method)
1. Change SRY data (Q501 SUB ADDR:11/D7~D4) to coincide level of black and white part in color
differential signal (R-Y) to the level of H. BLK part.
2. Change SBY data (Q501 SUB ADDR:11/D3~D0) to coincide level of black and white part in color
differential signal (B-Y) to the level of H. BLK part.
10. CHROMA TRAP ADJUSTMENT →NO ADJUSTMENT
11. H. CENT ADJUSTMENT
(Point) Receiving adjustment
(Adjusting signal) WG PHILIPS pattern
Do not use France SECAM pattern.
(Adjusting method) CONT=Maximum BRIGHT=Center COLOR=Center
Vary SUB Address [HPOS] to adjust picture center to screen center. (Set D-C to
minimum by CRT adjusting magnetic field.)
12.V. HEIGHT ADJUSTMENT
(Point) Receiving adjustment
(Adjusting signal) WG PHILIPS pattern
Do not use France SECAM pattern.
(Adjusting method) CONT=Maximum BRIGHT=Center COLOR=Center
Vary SUB Address [VPOS] to adjust center of Philips pattern to screen center.
Adjust SUB Address [HIT] so that top and bottom flags of Philips pattern can just be
hidden.
SPEC B-Y/R-Y mV p-p

– 17 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
Confirming
Correction field
Mid Near East
Russian
Asia, Hongkong
New Zealand, Australia
Adjusting
13.V901 ADJUSTMENT
(Point) C.CRT adjusting magnetic field
(Adjusting magnetic field)
Adjusting procedure is based on working instruction of CPT Adjustment.
perpendicular field
North field
North field
Zero field
South field
35 µT
35 µT
5 µT
–50 µT
35 µT
35 µT
5 µT
–50 µT
perpendicular field
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) 24.6kV
MAX HIGH VOLTAGE: (B) 26.0 kV
AC VOLTAGE: (C) 110~240V
CHAPTER 2 SPECIFIC INFORMATIONS
SAFETY INSTRUCTIONS
SERVICE MODE
ADJUSTING ITEMS AND DATA INTHE SERVICE MODE:
Item Name of adjustment
R CUTOFF
G CUTOFF
B CUTOFF
G DRIVE
B DRIVE
SUB-CONTRAST
SUB-BRIGHT
SUB-COLOUR NTSC
SUB COLOUR PAL
SUB COLOUR SECAM
BELL FILTER
RCUT
GCUT
BCUT
GDRV
BDRV
SCNT
BRTC
COLC
COLP
COLS
BELL
Preset Data
20H
20H
20H
80H
80H
07H
80H
80H
F6H
F6H
01H
←
←
←
←
←
←
←
←
←
←
←
Item Name of adjustment Preset Data
Table-1
SBY
SRY
TNTC
HPOS
VPOS
HIT
VLIN
WID
PARA
CNR
TRAP
SECAM B-Y
SECAM R-Y
SUB-TINT
HORIZ. POSITION
VERT. POSITION
HEIGHT
V-LINEARITY
PICTURE WIDTH
E-W PARABOLA (DPC)
E-W CORNER
TRAPEZIUM
08H
08H
40H
0AH
03H
30H
0CH
28H
1FH
08H
10H
←
←
←
←
←
20H
0DH
←
←
09H
←
Table-2
DESIGN MODE
ADJUSTING ITEMS AND DATA INTHE DESIGN MODE:
Item Name of adjustment Preset Data Data Remarks
* There are no adjustment mode in the DESIGN MODE.
Table-3

– 19 –
SPECIFIC INFORMATIONS
h
t
s
a
123
456
789
–/-- 0
MENU
CALL/ i
8
MENU
CH
MENU
CH
VIDEO
L-MONO R
(2)
L
AUDIO
VIDEO
L
AUDIO
L-MONO R
VIDEO INPUT(2)
VIDEO
VIDEO INPUT (2)
AUDIO (L/MONO)
VIDEO INPUT AUDIO
HEAD PHONE JACK
TV/VIDEO
MENU
CALL (On-screen call)
Direct select
(Power on)
–/– – Digit select
MENU (Menu open/close)
– Level down in
each function
t/s Menu select
o Sound Mute
fPower on/standby
;±Volume down/up
/ Channel select
(Position down/up)
aTV/VIDEO select
hPicture control
8Sound control
INFRARED RECEIVING
WINDOW
POWER SWITCH
POWER INDICATOR
CHANNEL UP/DOWN
VOLUME UP/DOWN
+ Level up in each function
LOCATION OF CONTROLS

– 20 –
SPECIFIC INFORMATIONS
PROGRAMMING CHANNEL MEMORY
Auto search memory (ASM)
All the channels that can be received are preset automatically.
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 accord-
ing 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.
Manual Search and Changing the assigned position
Example
Presetting Channel 12 to Position 12
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 at Remote in that order.
2Press (MENU) several times to display the SET UP menu
screen.
Press(t/s) andselect“>>>”.Press (–/+) to search. Press-
ing “–” searches lower frequency channel; pressing “+”
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 — When Channel 12 is preset to another posi-
tion
→Change the assigned position.
1Press (0~9) or ( /) to find the position preset for Chan-
nel 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.
3WhenPosition 12is set, press(t/s)toselect theitem“ ”.
Press “+”(–/+) to complete the presetting.
To turn off the menu function display instantly
Press the (CALL) button.
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 at 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, select
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.
*Please refer to owner's manual in detail.