Toshiba 34HF81, Руководство по обслуживанию, Страница: 11 / 54

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GENERAL ADJUSTMENTS
ELECTRICAL ADJUSTMENTS
Vertical retrace line
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) 1. Constrict the picture height until the verti-
cal retrace line appears adjusting the item
HIT (HEIGHT).
2. Adjust the CONTRAST control to the mini-
mum.
3. Call up the adjustment mode display, then
select the item BRTC .
4. Press the VOLUME
s
or
t
button so the
belt of vertical retrace line just disappear.
5. Adjust the CONTRAST control for the de-
sired contrast.
6. Perform the HEIGHT adjustment.
ITEM ADJUSTMENT PROCEDURE
SUB-COLOR
(SCOL)
SUB-TINT
(TNTC) 1. Receive color-bar signal from color-bar
generator.
2. Press the RESET button.
3. Connect oscilloscope to TP501 on SIG-
NAL board.
4. Adjust the CONTRAST control to the
minimum.
5. Call up the adjustment mode display,
then select the item TNTC .
6. Adjust the SUB-TINT by pressing the
VOLUME
s
or
t
button to obtain a blue
bar to magenta bar ratio of 3:2 as shown.
7. Press the RESET button.
8. Select the item
SCOL .
9. Adjust the SUB-COLOR by pressing the VOLUME
s
or
t
button to achieve
1.6V
0-p
of a blue bar on scope.
10. Check the picture with off-air signal.
0
Blue
Magenta
2
3 (1.6V
0-P
)
WIDTH
(WID) 1. Call up the adjustment mode display, then select the item WID .
2. Press the VOLUME
s
or
t
button to get the picture so the left and right edges of
raster begins to lack.
3. Press the VOLUME
s
or
t
button to advance the data by 7 steps.
Note : Check the horizontal picture position is correct.