Specifications

7.
Tl'oubleshooting
Problem
Probable Cause
Solution
Page
Soon
after
the
power
is turned
on,
the
indicator
lamp turns
off.
If the
power
is turned
on and
the
ST-E2
is not
used
foi 90
sec., the
power
turns
off automatically.
Either
press
the shutter
button
halfway
or
press
the<PILOT>
button.
24
Although
the
I icon
is lit in
the
viewfinder,
the slave
does
not
frre.
The I
icon in the
viewfinder
does
not
indicate
flash
ready.
Rather,
it indicates
that the
ST-E2
is
able to
transmit.
When the slave
is ready to
frre,
its AF-assist
beam
emitter
blinks.
27
The flash
picture
came
out
underexposed.
The
flash ratio
control
lamp was
lit even
though
a
multi-fl_ash
system
with
flash
ratio settings
was
nof, useo.
Turn
offthe
flash
ratio control
lamp before
taking
the
picture.
29
The subject
is beyond
the effective
flash range.
Place the
slave
nearer to
the subject
or use
a
larg-
er
aDerture
(smaller
f-number).
28
The slave
does
not
fire even
when the shutter
is released.
The slave's
channel
does
not
match the
ST-E2's
channel.
Set the
slave to
the same
channel
as the
ST-E2.
25
The slave
is too far
away
from the ST-E2.
Position
the slave
nearer
to the
ST-E2
and test
the
transmission
before
taking the
picture'
26
The slave
is on the side
or back
of the
camera.
Use
Off-Camera
Shoe
Cord 2
(sold
separately)
and
noint
the ST-E2's
transmitter
toward
the slave.
33
The Speedlite's
slave
sensor
is not
properly
point-
ed
at the ST-E2.
Use the
550EX's
bounce
feature
to
point
its slave
sensor
toward the
ST-E2.
26
The flash
ratio
has been set,
but the
slave
ID has
been set
to C.
Set the slave
ID to A or
B.
31
The ST-E2
does
not emit
the
Atr'-assist
beam.
The camera
is not an
EOS-3.
If the EOS
camera
has a
built-in
AF-assist
beam,
the camera
will emit
the
beam instead
of
the ST-
F2,
28
The slave's
flash-ready
indica-
tor
(blinking
AF-assist
beam)
turns
off.
The slave
is
in
the
SE
mode.
Press
the ST-E2's
<
PILOT
> button
to cancel
the
slave's
SE
mode.
28
The
test transmission
does
not
work.
You
pressed
the shutter
button
halfiray
and this
activated
the
exposure
meter.
Make
sure the
metering
display
in the
viewfrnder
is off.
Then test
the transmission.
28
The flash
ratio cannot
be set.
The camera
is not an
EOS-3.
The flash ratio
cannot
be set
with
cameras
other
than
the EOS-3.
The
ST-E2's
main switch
is set
to < HOLD>
.
Set
the
main switch
to <
|
>
24
,l
34
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