Checking The X-Sync Time Lag - Canon EOS 7 Service Manual

1.6 C X-SYNC T
HECKING THE
P :
URPOSE
To check that the shutter curtains are fully open when the flash is fired. The time lag
cannot be adjusted. If the user complains about vignetting by shutter curtains, etc.,
check the time lag. If the time lag is not within specification, replace the shutter unit.
S :
TANDARD
Shutter speed 1/125
Line A: 0.33 ms min. (until first curtain starts and X-sync contact turns ON)
Line B: 2.50 ms min. (until second curtain starts to close after the X-sync contact
turns ON)
T :
OOLS
EF-8000 or EF-5000
X-sync time lag shoe
C :
HECK
1) Connect as follows, and set the EF-8000 or EF-5000 to the DELAY mode to start
measurement.
2) Set the camera to TV priority, and set the shutter speed to 1/125 in the manual
mode.
EF8000
RED ( X )
BLACK ( GND )
To Acc. Shoe tool
EF - 8000
L
IME AG
A
C
DELAY
Fig. 4-4 Checking X-Sync Time Lag
4-9
Part 4: Electrical Adjustment
4.7k
ohm
To EF8000
RED ( X )
BLACK ( GND )
Acc. shoe tool