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SUB COLOUR
1. Receive a PAL colour bar pattern.
1. Adjust colour to achieve 5.3 V at TPE21.
2. Set controls:
. Connect a 1000 resistor between TPE6 and
contrast
maximum
earth.
bright
minimum
:
. Adjust sub colour (R606). For 2.0Vpp + 0.1V
2
picture
eenire
at TPE15 as shown in Fig. 9.
2.0Vpp = 0.1V
sub colour
centre
;
3. Connect DVM to TPE21.
. Remove 10002 resistor from TPE6 and earth.
4. Connect an oscilloscope to TPE15.
TELETEXT CONTRAST
Note:
Before
this adjustment
is attempted.
White
Balance
adjustment
must
be
finished.
1. Receive
a teletext signal.
1. Adjust
R3514
to obtain
the waveform
as
shown in Fig
10.
2. Connect an oscilloscope to TPY1.
2
3. Set controls:
minimum
contrast
maximum
5.5 MHz TRAP
2. Connect an oscilloscope to TPE15.
3. Connect
10022
resistor
between
TPE6 and ground.
PILOT CARRIER
. Change the stereo sound
into a multiplex sound, and connection of the
oscilloscope to TPH6.
. Adjust L2201 and R2210 to maximize the amplitude of sine wave.
Note:
Adjusted position of L2201 must be at the point where both stereo sound and
multiplex sound are maximized.
2. Connect an oscilloscope to TPH5.
CHANNEL SEPARATION
1. Receive a stereo signal with 40% modulation at
. Adjust R2224 to minimize signal level at TPH8.
1KHZ for R channel, 0% modulation for L channel.
2. Connect an oscilloscope to TPH8.
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