Canon EOS 7 - Page 84

Part 2: Technical Information
2-17
Fig. 2-20 Overall Operation and Basic Sequence (AI Servo AF)
Batteries loaded
Initialization
Standby
SW-1 ON or
metering active?
AE metering calculation
SW-2
SW-1
AF calculation
Lens driven
BC
M1 powered
Mg3-1 & Mg3-2 powered
M1 braked
EMD stopped down
Mirror up?
Mg3-1 OFF
Mg3-2 OFF
Exposure time controlled
M1 powered
Date imprinted
BC
EMD at maximum aperture
Mirror down?
M1 braked
M1 powered
Film advance
begins
Film advance
completed?
M1 Duty control
and braking
ON
OFF
NO
YES
OFF
NO
NO
NO
YES
YES
YES
SW-2
ON
ON
OFF
Lens driven
Lens driven
AF calculation
AE metering calculation
AF calculation
M1 powered
Mirror up
begins
Mg3-1 & Mg3-2
powered
M1 braked
EMD stopped down
Mirror up
completed?
Lens driven
YES
NO
Mirror goes up
Mirror down
begins