Maximum Aperture Singal Pin Adjustment (Assembled Camera; Maximum Aperture Signal Pin Code; Av Brush Position (Ae Charge (Aecg) Position) - Canon A-1 Repair Manual

2.9 Maximum Aperture Slngal Pin Adjustment (Assembled Camera)
1. Set the camera in TV at 1/1000 second.
2. Set the depth gage to 7.62mm and set it against the
pin. The aperture number "1.8" should be flashing in
the viewfinder.
3. Reset the gage to 7.S6nun and repeat. "2.0" should be
flashing in the viewfinder . In both step 2 and 3,
excess light should be kept out of the lens mount.
4. Adjust the pin height till the conditions detailed
above are met.
(The relaxed position of the pin should be approximately
5.5 to 5 .7mm below the mount surface.)
2.10 Maximum Aperture Signal Pin Code
AVO
The code output from the max. aperture signal pin should
be as shown in the table below (Fig. 2-10).
5.6 4 . 5 4.0
3.5
2.B 2.5 2.0 loB
1.4 1.2
Pin height
5.70 6.00 6.30 6.57 6.90 7.15 7.46 7.72 B.10 8.3B
:to.05
a - e
a - d
a - c
a
- b
(mm)
4
1 1 1 1 1 0 0 0 0 0
2 0
1
1 1 1
1 1 1 1 0
1
1
1 1
0
0 0 0 1 1 1
1/2 0
0 1 1
0 0 1
1 0 0
Note: "1" indicates continuity (near On); a indicates
an open circuit
(w).
Fig. 2-10
2.11 AV Brush Position (AE Charge (AECG) Position)
Precautions:
1. This adjustment not only affects exposure ac-
curacy. It also has an effect on the total AE
operation in that incorrect positioning will lock
the shutter and li ght the error mark (EEEE EE).
Take care to make the adjustment correctly.
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