Canon EOS-1V Service Manual page 55

1. ELECTRICAL ADJUSTMENTS
1.1 C
AUTIONS
• The EOS-1V's FPU IC has a flash ROM.
The flash ROM has a limited durability
(rewriteable up to 20 times officially and
over 50 times in actuality). If it is writ-
ten excessively, it may damage the FPU.
If the screen on the right appears, do
not rewrite the data needlessly. The
camera's FPU firmware, basic AF
adjustments, and exposure program are
written in the flash ROM.
• When data is written in the flash ROM a number of times, the output may
decrease. To restore the output to normal, select "F10: Exit" to refresh the flash
ROM. Since refreshing the flash ROM overwrites the data, it does not deteriorate
the flash ROM.
• The EOS-1V adjustment software program requires about 800 KB of disk space.
Each time the camera's data is read, more disk space is consumed. Data (all data,
AF data only, data except the AF data, or EOS Link data) transferred from up to
five EOS-1V cameras can be stored. Storing all the data from five cameras will
require over 2 MB of disk space. Before using the adjustment software, first install
it in the personal computer's hard disk. (It can run on a 1.4 MB disk, but an error
will occur when the disk space runs out.) To install the software in a Windows
95/98 system, refer to the Service Manual Report AG1-054.
• Install the adjustment software onto the hard disk. This is to facilitate the data
transfer of the front panel unit or camera's firmware. It will also make the adjust-
ment faster.
• If the HS-I/F is used, additional memory is required. Install the Expanded Memory
Unit (CY9-7082-002). Installation instructions are included with the unit.
• With earlier EOS cameras, the AF unit alone could be replaced. However, as with
the EOS-3, this is not possible with the EOS-1V. If the AF unit must be replaced,
the front panel must be replaced. Aging has been executed for the spare front
panel units, but not basic AF adjustments.
• New main flexible board units are already written with initialization data.
Therefore initialization is not necessary.
Part 4: Electrical Adjustments
FLASH_NG
Flash ROM data writing has been made
Flash ROM data writing exceeds 20 times.
Data should be stored.
Press space bar to return to previous sctreen.
Press RETURN to continue Adjustment.
4-1
25
times.