Panasonic BT-M1950Y Service Manual page 90

D l•IVI l~OUT
• V sync delay
The blanking signal from the deflection PB ASS'Y goes to IC405 pin 4, then from pin 7 to IC509 pin 3. (Although the
circuit is capable of switching with the OSD V sync signal from the deflection PB ASS'Y, the underscan/-overscan
switching signal at pin 9 is held at Low level by a resistor also connected to pin 9 and is not switched.) The signal
from pin 4 goes to IC504 pin 12, then to the pin 9 output.
Iv
rate!
IC504 4PIN
IC504 7PIN
IC504 9PIN
IC509
(3/3)
Q
71------------
IC504
V.
SYNC
DELAY
UNDERIOVERSCAN
+5V
TO
1------t~ IC 5 IO®
Fig. 4-7 V sync and H blanking delay circuits
Fig. 4-8 V sync delay circuit timing
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