Toshiba 25AF6SH Schematic
FILE NO. 070-200112
SERVICE MANUAL
COLOUR TELEVISION
D1ES Chassis
25AF6SH
Dec. 2001
CHAPTER 1 GENERAL ADJUSTMENTS
SAFETY INSTRUCTIONS ................................................................................................................................................ 3
SET-UP ADJUSTMENT .................................................................................................................................................... 4
SERVICE MODE .............................................................................................................................................................. 6
DESIGN MODE ................................................................................................................................................................ 9
ELECTRICAL ADJUSTMENTS ......................................................................................................................................10
CIRCUIT CHECK ............................................................................................................................................................ 12
GENERAL ADJUSTMENTS
CHAPTER 2 SPECIFIC INFORMATIONS
SETTING & ADJUSTING DATA ...................................................................................................................................... 13
LOCATION OF CONTROLS ........................................................................................................................................... 14
PROGRAMMING CHANNEL MEMORY ......................................................................................................................... 16
CIRCUIT BLOCK DIAGRAM .......................................................................................................................................... 18
CHASSIS AND CABINET REPLACEMENT PARTS LIST .............................................................................................. 19
PC BOARDS BOTTOM VIEW......................................................................................................................................... 27
TERMINAL VIEW OF TRANSISTORS ........................................................................................................................... 33
TABLE OF CONTENTS
SPECIFICATIONS ...................................................................................................................................................... END
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 13)
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
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. Color Purity
2. Convergence
3. White Balance
Note: 1.The PURITY/CONVERGENCE MAGNET assembly and rubber wedges need mechanical positioning.
Refer to figure 1.
GENERAL ADJUSTMENTS
*
COLOR 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
2.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.
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.
4-POLE
MAGNETS
6-POLE
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
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.
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
Color thickness correction
note: Displayed differently as shown below, de-
Item
Data
pending on the setting of the receiving color
system.
COLP (PAL)
COLC (NTSC)
COLS (SECAM)
S
CAUTION : Never try to perform initialization unless you have changed the memory IC.
The key function marked with are not usable to control in the Test signal for some model.
*
– 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 13)
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
• 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 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.
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
the number may possibly be damaged.
BLOCK
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.
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.
*
– 8 –
1. ENTERING TO DESIGN MODE
1) Select the Service mode.
DESIGN MODE
2) While pressing
Remote and press MENU button on TV.
o(or CALL) button on
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 13)
3. ADJUSTING THE DATA
Pressing of VOLUME s or t button will change the value of data.
Press
Press
ITEM
DATA
GENERAL ADJUSTMENTS
– 9 –
ELECTRICAL ADJUSTMENTS
ITEM ADJUSTMENT PROCEDURE
FOCUS VR ADJ
SUB-BRIGHTNESS
(BRTC)
GENERAL ADJUSTMENTS
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)
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 19).
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 colors
which did not light in the above step with CHANNEL s, t buttons. Then tap VOLUME ; – /+ buttons so that three colors 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.
Light area check
(to show white)
Dark area check
(to show black)
GENERAL ADJUSTMENTS
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 st button first and then select the built-in test pattern
with -/- - button.
– 11 –
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 13)
4. Vary the BRIGHTNESS control to both extremes to be sure the high voltage does not exceed the limit under any conditions.
GENERAL ADJUSTMENTS
CIRCUIT CHECK
– 12 –
CHAPTER 2 SPECIFIC INFORMATIONS
SETTING & ADJUSTING DATA
SAFETY INSTRUCTIONS
HIGH VOLTAGE AT ZERO BEAM: (A) 32.8 kV
MAX HIGH VOLTAGE:
AC VOLTAGE
Table-1
SERVICE MODE
ADJUSTING ITEMS AND DATAS IN THE SERVICE MODE:
25"
(B) 33.0 kV
(C) 110~240 V
Item Adjustment Reference data
RCUT
GCUT
BCUT
GDRV
BDRV
BRTC
COLC
TNTC
COLP
COLS
SCNT
HPOS
VPOS
HIT
VLIN
WID
PARA
TRAP
SRY
SBY
DESIGN MODE
ADJUSTING ITEMS AND DATAS IN THE DESIGN MODE:
R CUTOFF (B/W)
G CUTOFF (B/W)
B CUTOFF (B/W)
G DRIVE
B DRIVE
SUB BRIGHT CEN
SUB COLOR CEN NTSC
SUB TINT CEN
SUB COLOR CEN PAL
SUB COLOR CEN SECAM
SUB CONTRAST
50Hz H-POSITION
V-POSITION
HEIGHT
V-LINEARITY
PICTURE WIDTH
E-W PARABOLA
TRAPEZIUM
SECAM R-Y
SECAM-B-Y
Table-2
20H
20H
20H
40H
40H
40H
45H
43H
FFH
00H
09H
10H
04H
2FH
07H
10H
16H
11H
07H
07H
Data
←
←
←
←
←
←
←
←
←
←
←
←
03H
24H
08H
←
←
←
←
←
SPECIFIC INFORMATIONS
Item Name of adjustment Preset Data Data Remarks
OPT 1 OPTION 1 26H 26H
OPT 2 OPTION 2 07H 07H
Table-3
– 13 –
Front
LOCATION OF CONTROLS
r ON-TIMER (green)
q Power indicator (red)
a Input source selection
Remote sensor
q Power switch
Bihind the door
L/MONO R
SPECIFIC INFORMATIONS
a(3)Video 3 input
terminals
Back
AUDIOVIDEO
(3)
MENU
MENU
Headphone jack (ø3.5 mm)
For private listening, connect headphones.
The sound from the speakers will be cut off
automatically.
To adjust the volume, press the
–; +
buttons.
VIDEO
L/MONO
S-VIDEO
AUDIO
R
c* Channel Position ts
;* Volume
Menu item select
(2)(1)
COMPONENT
VIDEO INPUT
Y
B/CB
P
PR/C
R
CH
Menu item select
– +
* Dual function buttons.
(MONITOR)
Aerial input
a (2) Video input terminals
Component video input terminals
a (1) Video 1 input terminals
– 14 –
MONITOR output terminals
Remote
CALL
Number (0-9)
–/- - 1 or 2 digit selection
MENU*
89 Menu item select*
– + Menu item adjust*
CALL
123
456
789
–/-- 0
MENU
f Power on/standby
o Sound Mute
; Volume + – *
Channel position *
a Input source selection*
h Picture menu
8 Sound menu
m I/II Stereo/Bilingual Selection
SPECIFIC INFORMATIONS
* These functions have duplicate
locations on the TV set.
– 15 –
PROGRAMMING CHANNEL MEMORY
• First, use the ASM (Automatic Search Memory) function to preset all the active channels in your
area automatically.
Then, arrange the preset channels with the SEARCH (>>>), MFT (Manual Fine Tuning) and
AFT (Auto Fine Tuning) functions so that you can tune into only desired channels.
• This section shows how to tune in channels using mainly the Remote Controller. You can also
perform the system select, ASM, SEARCH (>>>), SKIP, MFT and AFT operations using the
buttons on the TV set.
To preset channels
To preset channels (ASM)
(Manual search, AFT, MFT)
ASM (Automatic Search Memory)
Select the head of the position number to start the
1
ASM with the position down ( )
digit/direct select buttons.
Press the MENU button repeatedly to call up the SET
2
UP menu on the screen.
Confirm that “COLOR” is set to “AUTO” and “SOUND”
3
SPECIFIC INFORMATIONS
is set to proper system.
If not, press the t/s buttons to move the cursor (-) to
“COLOR” or “SOUND” and press the
select each proper system.
Press the
4
“ASM”.
Press the “+” button to start the ASM. All active
5
channels will be preset automatically.
When presetting is complete, the initial position number
will reappear.
After presetting
Check the preset channels by pressing the position down
( )/up ( ) buttons.
• If the picture or sound of a certain channel is not good, finetune the channel using the MFT function.
• If the colour of a certain channel is abnormal, automatic
colour system selection (AUTO) may malfunction, or sound
system selection is wrong. In such a case, select another
colour and/or sound system.
t/s
/up ( )
buttons or the
–/+ buttons to
buttons to move the cursor (-) to
Manual search (>>>)
Select a position number with the position down ( )/
1
up ( ) or digit/direct select buttons.
Press the MENU button repeatedly to call up the SET
2
UP menu on the screen.
Press the
t/s
buttons to move the cursor (-) to “>>>”.
3
Press the –/+ buttons to start searching.
4
The – button searches for lower-numbered channels;
+
button for higher- numbered channels.
the
Repeat this process until you can get the desired channel.
When the desired programme is shown, press the
5
buttons to move the cursor (-) to “ ”.
Press the + button to memorize the channel at the
6
current postion.
When you desire to store another channel at another
7
postion, move the cursor
s
buttons and select a desired position with the –/+
buttons.
Then, press the
to “>>>” and repeat the steps 4 to 7.
* Please refer to owners manual in details.
(-)
to “POSITION” with the
t/s
buttons to move the cursor (-
t/s
t/
)
– 16 –
• Use the SEARCH function if desired channels could not be preset with the ASM, or if you would
like to preset the desired channels to specific position numbers one by one.
• The adjustments below are not necessary under normal conditions. However, in areas of
inferior broadcast conditions where adjustment is necessary for a better picutre, adjust the
tuning with the MFT (Manual Fine Tuning). The AFT OFF status automatically keeps the
condition adjusted with the MFT function.
• The AFT (Auto Fine Tuning) function automatically corrects slight fluctuations when receiving
signals.
• When using Manual Search to preset the channel, the AFT will automatically turn ON and SKIP
to OFF.
To skip unnecessary position numbers
After presetting the channels, you may skip unnecessary
position numbers so that only the channels you want to
watch are selected.
MFT (Manual Fine Tuning)
Select the position number you want to fine-tune with
1
the position down ( )/up( ) buttons or digit/direct
select buttons.
Press the MENU button repeatedly to call up the SET
2
UP menu on the screen.
To skip a position number
Select the position number to be skipped with the
1
position down ( )/up ( ) buttons or digit/direct
select buttons.
Press the MENU button repeatedly to call up the SET
2
UP menu on the screen.
Press the
3
“MFT”.
Press the –/+ buttons until the best possible picture
4
and sound are obtained.
Note
When operating the MFT function, the AFT status is
automatically set to OFF.
AFT (Auto Fine Tuning)
Select the position number you want to fine-tune with
1
the position down ( )/up( ) buttons or digit/direct
select buttons.
Press the MENU button repeatedly to call up the SET
2
UP menu on the screen.
Press the
3
“AFT”. Press the –/+ buttons to select the “ON”
indication.
t/s
buttons to move the cursor (S) to
t/s
buttons to move the cursor (S) to
Press the
3
“SKIP”.
Press the –/+ buttons to select “SKIP ON”.
t/s
buttons to move the cursor (S) to
4
Press the MENU button to turn off the SET UP menu
5
display.
Select the position number to be skipped with the direct
select buttons. The * mark appears to the left of the
position number.
The position number will then be skipped when you
select channels with the position down ( )/up ( )
buttons.
To restore a skipped position number
1 Select the position number you want to restore with the
direct select (and/or digit select) buttons.
2 Press the MENU button to call up the SET UP menu
display and press the
to “SKIP”.
3 Press the –/+ buttons to select “SKIP OFF”.
* Please refer to owners manual in details.
t/s
buttons to move the cursor (S)
SPECIFIC INFORMATIONS
Note
R
R
” mark.
” mark
When position is set to AFT OFF status, the “
appears to the left of the position number.
When the channel is set to AFT ON status, the
position number is displayed without the “
– 17 –
~
~
– +
TUNER
IF/MPX
H001 H002
QT01
QV01
QA01
QA02
Q801
Z801
Q404
Q301
Q501
Q901,Q903,Q905
Q610
Q840
L/R
VIDEO
L
/
R
AV IN
(1)
AV IN
(2)
MEMORY
REGULATOR
RESET
µ-COM
I
2
C BUS
R
G
B
HYBRID
CONVERTER TRANS.
+B VOLTAGE
C
Y
CHROMA
VIDEO
DEF.
VIDEO OUT
V. OUT
H. OUT
ERROR
AMP.
F.B.T.
H.V.
D.Y.
V
H
CRT
AUDIO OUT
L
R
*
AV SW
*
TEXT
*
*
*
*
BUS CONTROL BLOCK
SV
V
L
R
R
MONITOR
OUTPUT
V
L
R
V
L
CHASSIS BLOCK DIAGRAM
COMB
FILTER
QZ01
SPECIFIC INFORMATIONS
CIRCUIT BLOCK DIAGRAM
– 18 –
Loading...