Canon 550EX - Manual (Page 116)

Troubleshooting Guide
No. Problem Probable Cause Solution Page
1 1 cannot detach the Speedlite
from the cam era
The locking collar has not
been loosened enough to
retract the locking pin.
Loosen the locking collar
com pletely to retract the
locking pin
13
2 The flash does not fire even
when 1 press the shutter
button com pletely
The Speedlite has not been
m ounted properly on the hot
shoe
M ount the Speedlite properly
and securely on the cam era. 13
The hot shoe contacts are
dirty or the Speedlite’s
m ounting foot contacts are
dirty
if the contacts are dirty, use a
clean cloth to wipe them
13
3 After 1 turn on the Speedlite,
the pilot lam p turns off after a
while
W ith the m ain switch set to
SE, the Speedlite turns off
autom atically when it is not
used for 90 sec.
Press the shutter button
halfway or press the test
firing button
16
4 W hen 1 turn on the m ain
switch, the entire display
blinks
The wide panel is not fully
retracted
Retract the wide panel
com pletely
20
42
The wide panel has been
extended and the Speedlite is
set for bounce flash
Retract the wide panel
20
5 W hen 1 press the shutter
button halfway, the flash
range bar segm ents blink
The flash head has been
tilted downward by
T .
Except for close-distance
subjects, do not tilt the flash
head downward
43
92
6 1 installed new batteries in the
external power source, but
the flash still does not fire
Batteries have not been
installed in the 550EX itself.
O r, the batteries in the 550EX
are exhausted.
Even when using an external
power source, be sure to
have good batteries in the
550EX.
10
7 1 installed new batteries in m y
external power source and
connected it to the Speedlite
W hen 1 turned on the power
switch, the flash head
zoom ed autom atically O r the
LCD panel display went out
The batteries in the 550EX
are exhausted Disconnect
the external power source
and turn on the 550EX. If the
pilot lam p does not light
within 30 sec , the SSO EX’s
batteries are exhausted
Replace the batteries in the
550EX with new ones
10
8 The flash picture looks dark
toward the bottom .
The subject was too close to
the cam era.
if the subject is 2 m eters or
closer, tilt the flash head
downward by
T
43
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