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7-38 Reference — Camera
When the camera is
connected to a computer,
and/or the camera is being
operated with the AC
battery charger/ adapter, a
studio flash connected to
the PC terminal will not go
off, or goes off only once
and then freezes.
Polarity is reversed in
the studio flash — a
condition that
becomes apparent
when the camera
system is grounded.
You can confirm this
condition by
operating the camera
with the flash after
disconnecting the AC
adapter and the
computer; the flash
should then operate
normally.
If the plug is reversible, reverse the
plug where the sync cord plugs into
the flash.
Or, use a commercially available IR
slave or radio slave.
You have other problems
with a flash.
A non-dedicated
incompatible
electronic flash is
being used.
Check with a Canon authorized
service facility for compatible
equipment.
Trouble Possible Cause Suggested Solution