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| -TX-2151
1/1 C-21S
7h
LT X—14517/1 C-14515
ADJUSTMENTS
SUB
NTRAST
:
i
Adjust Sub brightness (R306) to set
Adjust R316
1.
Receive a Philips pattern.
fhe Blaciclevel 16 ON.
2.8V+/-0.1V—p
(Input level 75dB).
.
Adjust the Sub contrast (R316) to set
Connect an oscilloscope to
the drive voltage to 2.8V+/— 0.1V—p.
TPY1.
Set controls to :
Brightness
minimum
Contrast
maximum
Colour
minimum
~ ~ Adjust (R306) 4
Sharpness
centre
Pix
minimum
Fig.5
SUB COLOUR
1.6Vp—p +/— 0.1V
Connect a short jumper between
TPE6 and earth.
Adjust the sub colour (R607) for
1.
Receive a PAL colour bar pattern.
2.
Set controls to:
Brightness
minimum
1.6Vp—p +/— 0.1V at TPE15 as
shown in Fig.6.
Contrast
maximum
Sub colour
eanire
Remove the earth jumper wire.
Colour
centre
Sharpness
minimum
.
Connect an oscilloscope to TPE15.
TEXT CONTRAST
1.
Receive a teletext signal.
1.
Adjust R3515 to check the maximum
level > 1.5v and a minimum level < 0.6v.
2.
Connect an oscilloscope T2 pin 5.
2. . Adjust R3515 to centre. (pk — pk *)
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