Canon A-1 Repair Manual page 124

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Fig. 3-7
10. GND (lOP, 20P)
Ie
ground connection
11.
AD NULL L
(2P), AD
NUL
2 (lP)
Offset a djustment for operationa l amp for the A/ O
converto r. Adjustment 1s simila r to AE-l's PX-l offset
adjus· t ment.
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Fig. 3-8
12. CAD (3P)
20£
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Brightness Analog to digital
convertor amplifier output
to
AID
capacitor (CAD) •
1
AD
Time T
After metering is started,
a delay of 3 AD time units
take s place before digitally
c o nverted BV information is
sent from the Input
Ie
thru the
I
BUS to the CPU
Ie. This is to provide
stabilization time for the
SPC. (See also 17
AR5
OUT)
68
}'ig . 3-9