Tektronix 7704A

Circ u it Description -7704A Service
F
igure 2-10 Α sh ows α logic diagram of t h
e
H orizontal
B
inary stage . An
inpu
t/output table s
h
owing t
h
e con d itions
for eac
h
position of t
h e H O R IZO NTA L MOD E switc h
is
s h own in F ig . 2-10 Β .
V ertical B inary
T he V ertical B inary stage produces t he Disp lay
R
ig
h
t
Comman d to d etermine w h ic h vertical unit is to be
displayed on t he C
R T .
Wh en t
h
is o
u
tput
level
is HI,
t he
R IG H T VER T unit is d isplaye d an d wh en it is L O, t h e
LEF T VER T unit is d isplaye d . In t he A LT or CH O P
p ositions
of t h e H O R IZO NTA L M OD
E
switch (non-
delayed operation only), t h e o u t p ut of t h is stage is
slave
d
to t h e output of t h e H orizontal
B
inary stage so
t h
at
t he
Dis p lay
R
ig
h
t
Comman d is always
HI
w h en t h e MF ( M ain
F
rame) C
hannel Switc h Signal (Dis p lay Β ) is L O, an d vice
versa
.
T h is action allows sweep-slaving operation in t he
A L T p osition of t h e VER TICA L M OD
E
switc
h
an
d
t
he
A L T or C H O
P
positions of t
he H O R IZO N TA L MOD E
Input
Φ = H as no effect i n t h is case
η +1 = If ou t pu t is L O p rio r to L O S , it goes HI, a nd vice ve rsa
Ι Actu ate d by negative-goi n g e d ge .
2 R epetitio n rate o n e- h alf H o r izontal C h opped B la
nk i n g r ate .
3 R ep etitio n rate o n e- h alf Alte
rn ate Pulse r ate .
Output
MF C h annel
Switc h Sig n al
(Dis p lay Β )
2-1 6
F ig . 2-10 .
(
Α ) L ogic diag r am for H orizo n tal
B
i n
ary stage ; ( Β ) Ta b le of i np ut/o u tp u t co mb inatio n s .
Ο
Ζ
.
ν
1
Τ
3
φ
4
W
7
ν
8
ν
-
10
e
y
6 H o r izo n tal Display
Φ
HI
L O L O Φ L O L O Α H o r izo n tal un it
Φ L O HI HI Φ L O HI ΒHo r izo n tal un it
L O S
L O LO L O Φ HI η +1 2 C hop between Α a nd Β
Φ L O L O L O L O S L O η +1 3 Alte rn ate between Α a nd Β