Flash Adjustment - Canon EOS 55 Service Manual

Part 3: Repair Information
4.14
FLASH ADJUSTMENT
If the main flex or TTL (OTF) sensor is replaced, this adjustment is mandatory. If this
adjustment is done, the shutter adjustment must be done after
it.
PuRPOSE:
To adjust the output level and gain of the flash sensor for correct flash film plane
exposure.
Standard:
Average ±lEV or less
TOOLS:
Personal computer RS-232C cable HS-1/F
Adjustment program (stored on a work disk)
EF-8000 (Direct flash sensor DIR201)
EF50mm
f
I
1.8 production lens
Speedlite (300 EZ, 420 EZ, or 430 EZ)
Tripod
Ambient light should be under EV3. If a dark room is not available, establish a test
area with stable conditions and no highly reflective objects. Test about ten cameras
from stock and establish an average.
PREPARATION:
1) Run the adjustment software, and select F4 Flash Adjustment.
2) Fix the camera on the tripod and attach the EF50mm
f/1.8
production lens and
speedlite to the camera. Set the camera to ISO 100, shutter to 1/125, and aper-
ture to about
f
/5.6. Set the speedlite in TTL mode and position the camera 2m ±
10mm away from the reflector.
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