3-3. Video Blanking Circuit and Video Mute Circuit
The H blanking pulse is applied to the push pull circuit which is composed of
and Q772. During the blanking
period this pulse turn on the transistor
and the video amplifier at cut-off. The video mute signal is generated at
the CPU (pin
when input signal is changed. Q770 is turned on by the video mute signal from the CPU. Then
is turned off and the video amplifier is cut-off during the time that the video mute signal is generated.
A8 VIDEO MUTE
0
0772
J4
BLANKING PULSE
(Fig 3-3-l) Video Blanking and Mute Circuit
3-4. ABL Circuit
The maximum average current flowing through the CRT is’ controlled to under
by limiting the video Vp-p
swing. The voltage of CN-J3 is clamped at
by 0720 when the anode current is
or less. If the anode
current exceeds
the voltage of CN-J3 drops to less than
due to the voltage drop of
and
This drives Q722 and
to decrease the collector potential of
and the gain of
is decrease.
0
R534
CN-J3
(Fig 3-4-l) ABL Circuit
54
Summary of Contents for MultiSync 4FGe
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