Continued from preceding page.
Input signal
Symbol
Burst gate pulse length
BGPWD
LA76850
Test point
23
Input signal
Y IN:
Horizontal/
vertical sync
signal
PAL
Test method
Measure the BGP width T of the pin 28 FBP IN
wave form for Hsync period.
T
Bus conditions
Burst gate pulse
I phase
BGPPH
Y IN:
Measure the time from the left end of Hsync at pin
23
Horizontal/
42 Y IN to the left end of the pin 23 FBP IN wave
vertical sync form for Hsync period.
signal
42
PAL
Hsync
Y IN
Horizontal output stop
voltage
Hstop
T
FBPIN
Y IN:
Decrease the current from a source connected to
20
Horizontal/
pin 20 and measure the pin 20 voltage at which
vertical sync HOUT stops.
22
signal
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NoA0017-20/31