3.1.4 ACL
(Auto
Current Limit) Circuit:
If excessive beam current flows to the
CRT,
it reduces the range of contrast. This circuit prevents the excessive
current from flowing to the
CRT.
--_e_-------
Vee
(8V)
<Fig.?>
If the voltage at terminal 30
is
lower than
6.3V,
02
is turned on.
6.3V
CONTRAST
CITCUIT
Therefore the range of contrast control is reduced by the received information.
3.2 Video
Output
Circuit
RGB input signal (O.?Vp-p) of TA8631N
in
video Video preamplifier stage is amplified to about 3Vp-p. This will not
change the polarity or input to the
0101,
0102
and
0103
of Main PCB.
L801
correct the frequency characteristics of the amplifier.
C804 blocks the DC component of the video output.
Video output buffers,
0803
and
0804
correct the frequency characteristics of the video output circuit.
GtOS
C3504
<Fig.8 Video Output Circuit>
25
SlOt
DSP20lII
Q
1/'lil
51102
DSP20lII
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