<p>My damaged 283 won't work on batteries; the ones I tested it with are 100-percent fresh. I tried firing the flash with the VP-1 Vari-Power module and the standard Auto-Thyristor sensor installed. No dice with either, at least in battery mode. I even tested it with different battery carriers--those things that one slips the batteries into before stuffing the whole shebang into the flash. <br>
To my surprise and great relief, the flash does work perfectly with the SB-4 AC adapter plugged into the wall. This is a partial victory, because it means I can still use it for product photography in my basement, of which I do a lot, and I won't have to dump the flash in a landfill. I already found a replacement 283 for $27.50, for my use on the road. <br>
So, Robert and Craig, you were both right. I seem to have messed up the battery connections somehow when I dropped it. Craig, I'm always glad to run across another 283 fan. I have four (well, now three and a half) and they do everything I need them to do. I never spent more than $40 on any of them. <br>
Thanks for your responses.</p>