Tektronix 492 - Page 217

Theory of Operation—492/492P Service Vol. 1 (SN B030000 & up)
MAX SPAN-
DOT
BFRD ------
TUNE VOLTS
FREO DOT-
FREO DOT
r >
UNBLANK U20A2B
>
L
U20328
o
RETRACE U2D42A
m
COLUMN
HORIZ ADDRESS
HORIZ D/A
VERT D/A
RETRACE ONE-SHOT
U2042A-0
UNBLANK ONE-SHOT
U2042B-Q
=5.9 μ% - f
Y - ^ 5 μ%
R/O OFF GATE
IN U1038B-5 (FREO DOT)
Λ .
R/O UNBLANK GATE
IN U2032B-5 (DISPLAY DOT)
J V
r
R/O UNBLANK
R/O HORIZ
Fig. 5-23. Frequency dot marker circuit and timing.
5-54 r e v AUG 1981