In article .com,
says...

Schematic from APC, "Not gonna happen."

If it is not the batteries causing the problem, it must be sent to APC
for repair.
APC is very tight with service information and will not release it for
any price.

Most definitely true. That's one big reason I don't buy from them
on a regular basis. Their attitude towards those who are qualified, and
willing, to do self-maintenance is downright insulting.

Happy tweaking.

--
Dr. Anton T. Squeegee, Director, Dutch Surrealist Plumbing Institute.
(Known to some as Bruce Lane, ARS KC7GR,
kyrrin (a/t) bluefeathertech[d=o=t]calm -- www.bluefeathertech.com
"If Salvador Dali had owned a computer, would it have been equipped
with surreal ports?"