Canon A-1 Repair Manual page 139

19 .
STK2 (19P)
STK2 stands for stroke two,
or the closing of the second
I
2.4-2.6V
shutter button switch SW2.
When SW2 is closed, the
O.4-0.6V
voltage at pin 19 is 0.4 -
0.6V. When the switch is
off, the voltage is 2.4
Fig . 3-37
to 2.6 volts.
20 .
END (20P)
This is the SWS winding
).
(
completion signal input.
1.0-1.2V
When winding is complete,
this pin is at ground.
This signal releases the
0
El latch (EILK) .
Fig. 3-38
2l.
AE LK
This signal retains the
BV signal present at the
I.O-I.2V
time the AE LK is actuated.
The exposure value will
0
remain the same even
if
the A/ T dial is changed.
The calculated value will
Fig . 3-39
change to maintain the
same EV for the value which
has been set .
22.
SLED (22P )
LED drive signal.
2-2 .~V
0
Fig. 3-40
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