Canon EOS 7 Service Manual page 179

• TTL Level Shift
CAUTION
• Be sure to use the TTL flash (540 EZ, 300 EZ, etc.)
• If the adjustment value is changed, the shutter may no longer fully close.
So, when the adjustment value has been changed, the flash must be
turned OFF then ON again.
P :
URPOSE
To adjust the level of the flash sensors. The TTL gain adjustment must be finished
before you start this adjustment. (Normally, this adjustment is not necessary.)
S :
TANDARD
Average ±1 EV
P :
REPARATIONS
1) Attach the camera on the tripod, EF 50 mm f/1.8 tool lens and Speedlite.
2) Set TV=1/125, AV=F5.6 in the manual mode.
3) Set the measuring tool to ISO 100.
A :
DJUSTMENT
1) Select [F2] TTL Shift in the Flash
Adjustment Menu. First check the
adjustment of the flash level for the
left sensor. Measure the amount of
light on the film plane. Move the
cursor key to select the
compensation amount, and press
the RETURN key.
• If the adjustment does not go well,
press ESC key to enter the
standard value (default).
2) Check the adjustment of the flash
level of the right sensor. Measure the
amount of light on the film plane. If
OK, press the RETURN key.
• "The current value. xxx" is a guide
for this adjustment. If it deviates
greatly from this adjustment range,
the setting may be improper or the
TTL sensor unit may be defective.
3) In the same way as the left sensor,
adjust the flash level of the center,
left and outside sensors. Sensor
selection is automatically adjusted
by the adjustment software.
ATTLSFT1
Flash
Adjustment
TTL Shift (Left)
-2 -1
Turn Speedlite main switch on and adjust TTL Level.
Set standard reflector 2m from camera, and fire flash.
Check the flash level and select compensation with cursol key.
To make compensation, press RETURN.
To return to Flash adjustment menu, press SPACE bar.
{To write standerd value (default value), press ESC key}
ATTLSFT2
TTL Shift
(LEFT)
Be sure to turn the Speedlite main switch off once and then back on,
otherwise the shutter will not release.
Check the film plane illumination.
Current value is 000.
Adjustment range is -150 to 255.
If OK, press RETURN.
If NG, press SPACE bar and make readjustment.
4-31
Part 4: Electrical Adjustment
0
+1 +2
Limit:
+/- 1.0 EV