Canon A-1 Repair Manual page 130

64
2V
ln~
If the oscilloscope in use
has no sweep delay, SW4
opening can .be used to
trigger the scope, but
display of the start of
" , . ,
..
, " . ,
. '
. . ...
'
" "
..
, '
'
..
,
" , '
,. , ' . , , '
. , . , ' . , .
, ' "
IV
Fig. 3-20
CT charge is not possible.
(Fig. 3-20)
3. SMGl (3P)
This is the output gate to eSC/Interface IC for
~IGl
operation. (See notes 2 and 3 on the
Exposure Timing Chart)
' I - -
2-2.~V
T
--l
O-O. IV
,.
Fig. 3-21
4. Bias (4P)
Gate length (T) varies
with the aperture being
set. Smaller ' apertures
require a longer gate.
This is a bias voltage originating in the
eSC/Interface
IC which is used in the CPU IC to raise the base
reference voltage waveforms to an approiate level for
operation. The bias voltage is normally 3.5 to 4
volts.