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2-11 Horiz./Vert. pulse input
The vertical and horizontal
pulse from the deflection circuits are inputted
to pins 1 and 2 in
order to synchronise
the On Screen Display.
The vertical pulse inputted to pin 2 is made by the sandcastle
pulse which is outputted from
pin
38 of
ICI 01. The sandcastle
pulse is extracted
the horizontal
components
at the CR
integrating circuit consisting of R796 and C791.
The horizontal pulse inputted to pin 1 is made by the retrace pulse which is generated
on pin
5 of flyback transformer.
If one of these pulses is not supplied to the CPU, the on-screen display cannot be displayed.
-1u'1
EY
Horiz.
4111111111111111111111111
CPU
H-SYNC.
1
V-SYNC.
2
I
\
IL---A
w
Hor]z,
J
Veri.
Iclol
lF/Video/Chroma
38
AA1-A
-19-
AAI -A
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