Canon A-1 Repair Manual page 131

5. SMG3 (sP)
This is the output gate to the OSC/Interface for MG 3
operation. (See also Fig. 3-41)
I
n
I
I. .11. ~m.
12m.
Fig. 3-22
6.
SV
(6P)
121'
In
2-2.5V
O-O.IV
MG2 requires only a
short signal for opera-
tion. There is no
separate
"SMG211.
The
combination of SMGl
low and a 5
InS
SMG3 high after 12
InS
of SrlG3 low provides
the acitvatlon signal for
MG2. (See also Fig.
3-43)
(Trigger: 07)
This is the film speed
(ASA) gray code input to
the Cpu •
..
. , ...
..I..y
..l.
. . ..
Fig . 3-23 Gray code:
LSD 000011001
. .. .
. .
I
' .. .. . .
12V
I ' .. .
.. .
•
I I
.
.. .
'"
.
r· ...
. ...
2.~-3V
O.4-0.SV
Fig. 3-23
SV code is from TB2 thru
TB7.
SV: 011001
=
ASA 100
65