Canon A-1 Repair Manual page 109

EV
9
12
15
I Bus pad
SYNC
( 07)
Fig. 2-28
eLK
pad
3. Attach the test rleads to the proper terminals on the
Bus Checker. (See the Bus Checker instructions also.)
4. Using a light source adjusted to the birghtnesses
shown in the chart below, adjust the output of the
SPC (BVa octal code). (See the EV-Bva code Table)
K
=
125
SPC aUTPUT
(BVa Code)
Adjustment
Brigh~ness
(cd/m or nt)
Center
Limits
Adjustment
Interaction
64 142
136-146
VRG
Ql:
512
172
166-176
VRG, VRL
4096
222
216-226
VRL
Fig. 2-29
Notes: 1. The SPC output (BVa' is independent of the
settings of the ASA or A/T dials.
2. Sh.ield the SPC from extraneous light. Any
light other than that coming thru the lens
will change the adjustment.
3. The viewfinder display has no effect on the
ad justment. 41