John,
Try removing the batteries. I don't think you need them with the SB-4.
I was also thinking that the 285HV used the SB-6.
Brian Huber
> I have a question for anyone who is electronically inclined!
> I am powering my Vivitar 285HV flash gun with the dedicated
> SB-4 110v/120v AC to DC power pack. The gun requires four new
> AA batteries to operate the synchronization circuit. Although
> the gun's recycle time is faster than had I been relying on
> battery power alone I have noticed that the batteries are
> also draining.
>
> I am wondering whether the battery drainage is attributable
> to them operating the synchronization circuit only or whether
> the gun requires the batteries to provide part of the charge
> the other part of which is provided by the power pack.
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