Toshiba 28ZH46P, Service Manual

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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
(Address:BRTC)
Note: Constrict the picture height
until the vertical retrace line
appears adjusting the adress
HIT (HEIGHT).
1. Set CONTRAST to minimum, and
BRIGHTNESS to centre 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 is just
before the difference between the belt of
vertical retrace and the border of black
portion of 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 ,
buttons, and adjust horizontal or
vertical picture position in the centre
of screen with VOLUME
– /+
buttons.
VERTICAL AMPLITUDE
ADJUSTMENT (HIT) 1. Set the TV in service mode, and get
black or white cross-bar signal
with VIDEO button on remote hand
unit.
2. Select HIT (Vertical amplitude) with
CHANNEL , buttons, 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
* For models without internal pattern generator , use external signal generator
SERVICE MODE ADJUSTMENTS