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4. Pulse generator circuit
The Y signal from IC305 pin 14 is supplied to IC501 pin 5. The signal is switched with the G component (G ON SYNC)
of the RGB signal via pin 3 by the RGB/-OTHER signal from the MPU. The selected signal goes from pin 4
to
pin 2.
An external sync signal input from the Ext Sync terminal goes via CN002 pin 8 IC501 pin 1. Selection is
by
the SYNC -
INT/EXT signal from the MPU. The selected signal is sent from pin 15 through the 0151, 0501 and 0502 amplifier and
buffer circuit to the sync separator circuit of 0503 - 0514 where Hand
V
sync are separated.
CN002
18
G
fON sYNC>
eH
separation
AMP/BUFFER
0515,0501,0502
Fig. 4-1 Pulse generator and H separator circuits
H. SYNC DELAY
The signal from 0513 collector goes to IC502 pin 5, then from pins 6 and 7 to IC509 pins 2 and 1. The signal is
switched by -PULSE CROSS from the MPU. The selected signal is sent from pin pin 15 to IC502 pin 11, then from
IC502 pin 9 to IC510 where it is inverted to produce H sync. The H sync position changes according to the Pulse
Cross switch on/off state.
TP-CSYNC
n
n
n
I
I
I
IC502 SPIN
I
I
I
I
I
I
I
PULSE CROSS
u
u
u
SW: OFF
'
6PIN
_J
I
9PIN
I
I
I
I
I
I
I
u
u
u
I
PULSE CROSS
I
I
SW:ON
I
I
I
I
I
7PIN
I
I
I
I
I
9PIN
,
-u
u
u
Fig. 4-2 H separator circuit timing
-87-
Dl•MHIOUY
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