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TOSHIBA 2857 DB
ADJUSTMENT PROCEDURE:
Service Mode Cont'd
1. Set the TV in service mode, and get black or
white cross-hatch signal with VIDEO button
on remote hand unit.
ITEM:
2. Select HIT (Vertical amplitude) with CHAN-
Initialisation of QA02 (Memory)
NEL
amplitude with VOLUME
ADJUSTMENT PROCEDURE:
that vertical amplitude lacks a little.
After replacing QA02, the following initialisation
3. Adjust vertical amplitude with VOLUME
is required.
+ buttons so that the first bar on cross-hatch
1. Call up the adjustment mode display following
signal touches edge of screen.
the steps 1 and 2.
2. Press the CALL button on the Remote Control
and CHANNEL
buttons on the TV set
simultaneously. The initialisation of QA02 has
been completed.
3. Check the picture carefully. If necessary,
adjust any adjustment item.
Perform "AUTOMATIC SEARCH MEMORY"
ITEM: SUB-BRIGHTNESS (Address: BRTC)
WHITE BALANCE ADJUSTMENT
Note: Constrict the picture height until the
CUTOFF ADJUSTMENT
vertical retrace line appears adjusting the
(RCUT)
address HIT (HEIGHT).
(GCUT)
(BCUT)
ADJUSTMENT PROCEDURE:
1. Set CONTRAST to "00,, and BRIGHTNESS to
DRIVE ADJUSTMENT
"50" by adjusting user controls.
(GDRV)
2. Set the TV in service mode to get white cross-
(BDRV)
bar of inside pattern.
3. Select BRTC (brightness correction), and
1. Set Contrast to 40, and brightness to +20 by
adjust the
- / + button to reduce the value
picture control.
so that white portion of inside pattern slightly
2. Set the TV in service mode, and get the inside
light.
W/B adjusting signal with VIDEO button.
4. Adjust
- / + button to increase the data
3. Select RCUT, GCUT and BCUT with CHAN-
value of BRTC, and set it just before the
NEL
difference between the belt of vertical retrace
32, and to set GDRV and BDRV to 20 with
and the border of black portion of inside
VOLUME
pattern is visible. After that, return vertical
4. Press
height and contrast.
rotate Screen VR to get one slight horizontal
line on screen.
Note:Every pressing of
Horizontal line picture and Normal picture
alternately.
5. Press
picture, and select the two other colors which
did not light in the above step with CHANNEL
,
buttons so that three colors slightly light in the
same level.
ITEMS:
To correct white balance in light area, select
HORIZONTAL POSITION ADJUSTMENT
GDRV and BDRV with CHANNEL
(HPOS)
to adjust.
VERTICAL POSITION ADJUSTMENT (VPOS)
To correct white balance in dark area, perform
fine adjustment of RCUT, GCUT and BCUT.
ADJUSTMENT PROCEDURE:
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
,
buttons, and adjust horizon-
tal or vertical picture position in the center of
screen with VOLUME
- / + buttons.
SELF DIAGNOSTIC FUNCTION
1) Press "9" button on Remote Control during
display of adjustment menu. The diagnosis
will begin to check if interface among IC's are
executed properly.
2) During diagnosis, the following displays are
shown.
(1)
(2)
(3)
ITEM:
(4)
VERTICAL AMPLITUDE ADJUSTMENT (HIT)
(5)
1) Part number of microcomputer (QA01)
2) Operation number of protecting circuit ----"00"
is normal. When indication is other than "00",
overcurrent apts to flow, and circuit parts may
possibly be damaged.
,
buttons, and adjust vertical
3) BUS LINE CHECK ---- "OK" is normal.
"SDA1-GND" means that SDA line is shorted
- / + buttons so
to ground.
"SCL1-GND" means that SCL line is shorted
- /
to ground.
"SCL1-SDA1" means that SDA line is shorted
to SCL line.
4) BUS CONT----"OK" is normal.
When indication shows "Q OOO NG", the
device with the number may possibly be
damaged.
5) BLOCK
UV : TV reception mode
V1: VIDEO 1 input mode (
V2 :VIDEO 2 input mode (
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.
,
buttons, to set individual values to
- / + buttons.
button on the remote control and
button provides
button to release horizontal line
buttons. Then tap VOLUME
- / +
Sub Data Additional Description
Symbol
,
buttons
HPOS
Light area check (to show white)
HIT
Dark area check (to show black)
LIN
(SELF CHECK)
2390XXXX
POWER
:
00
BUS LINE
:
OK
Bus CONT
:
OK
BLOCK
:
UV V1 V2
QV01
2
Item
Name
Setting(User control)
[COLP]
SUB
Contrast: MAX
COLOUR
Bright: CENTER
PAL
Color: CENTER
[RCUT]
R cut-off
RCUT 40 Hexa-decimal
[GCUT]
G cut-off
GCUT 40 Hexa-decimal
[BCUT]
B cut-off
BCUT 40 Hexa-decimal
Screen VR
Screen
GDRV 40 Hexa-decimal
Select horizontal line mode by
pressing -I- - button on the remote
control in service mode.
1)
2)
[RCUT]
R cut-off
Contrast: MAX
[GCUT]
G cut-off
Bright : CENTER
[BCUT]
B cut-off
Color : CENTER
[GDRV]
C drive
[BDRV]
B drive
(White
balance)
Model name: C5SS (2857DB/3357DB)
Adjustment parts or
Input point/
Bus control item
Output point
Horizontal amplitude
Visual check of picture
adjustment (WID)
(Bus control)
Pin distortion
compensation amount
adjustment (PARA)
Keystone distortion
compensation amount
adjustment (HOP)
Description
Symbol
Description
H screen position correction
VSC
V linearity correction 2.
V amplitude adjustment.
Linearity balance between top/
bottom and center.
VPOS VPS
V picture position adjustment
V linearity correction 1.
VCP
Setting of amount of V amplitude
correction against variation of
screen brightness.
WID
H amplitude adjustment.
Linearity balance between top
and bottom screen.
Input signal
Measurement point
Adjustment procedure
Sub-bright
IC501
1. Select slave address OCH
signal
#55
[COLP].
(PAL)
(TP501)
2. When [COLP] is selected, Y-signal is muted
and only color signals are outputted.
3. Adjust amplitude of the upper half of the colour
bar output.
Screen
1. Set the controls as shown in
adjustment
the left column.
2. Gradually increase the screen
VR (T461) until one of R, G or BDRV B line begins
to brighten slightly.
3. Determine the position of the screen VR here.
4. Adjust RCUT, GCUT and BCUT, brighten other lines
until they begin to light slightly.
(Adjust DATA so that the line becomes almost white.)
5. Press -I- - button on the remote control to escape from the
horizontal line mode.
White, etc.
Screen
1. This adjustment must be done
adjustment
after adjustment of the above-
mentioned cut-off and screen
VR's have been completed.
2. Adjust cut-off and drive DATA
alternately.
3. Use a checker to adjust
brightness by changing modulation factor.
Adjustment signal
Adjustment conditions and procedures
WG Philips pattern
1. Conditions: After V. HEIGHT, VERT POSITION
and H. CENT have been adjusted, set
Do not use the Philips
the controllers as follows:
pattern of
Contrast: MAX
FRANCESECAM.
Brightness: Center
Color: Center
2. Adjustment procedure
a. Adjust the horizontal amplitude by the sub address WID.
Adjust so that the left and right white flags of
Philips pattern disappear at the very limits.
b. Make the left and right vertical bars straight by the sub address PARA.
c. Compensate the key distortion by the sub address HOP.
d. Again, adjust the sub address WID.
Symbol
Description
PARA
H pin-cushion distortion
correction.
CNR
H pin-cushion distortion
correction at four corners.
TRAP
Pedestal distortion correction.
Adjustment standard
1.35V(p-p)
± 0.2V(p-p)
HIGH LIGHT;
(103cd/m
3
)
7195K
-0.005uv [BDRV]
DARK;
(17cd/m
3
)
7695K ± 0uv
Symbol
Description
HCP
Setting of amount of H amplitude
correction against variation of
screen brightness.
VFC
V linearity correction.
Linearity balance at 1/4, 3/4
areas from top.
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