Canon A-1 Repair Manual page 138

72
15. CLK (15P)
1
v .
0/1;
This is the basic timing
pulse, or clock pulse, for
t he entire unit. It
o ri ginates in the esc/
I n terface IC.
Its frequency is 32,76S Hz .
. t- I
-10
+-
-+-
I--:-
-I-
1.0-1.2V
o-O.IV
..
~
. . . ..... . ..... . . . ..... . . . . . .
Fig. 3-35
16. I Bus (16P)
This t s the input for the I Bus information. (See also
3 . 2.3)
17 . KVC (17P)
This is t he standard r eference voltage input (KVC =
1.625
±
5% )
lS. DISP (lSP)
Input signal from viewfinder display switch (SW3) .
When the switch is on, the display is off, and pin
lS is at ground. When the switch is off, the display
is on and the voltage at pin lS is approximately 1 to
1.2V.
I
Fig. 3-36
1.0-12V
OV