Schematics for APC Back-UPS XS 1500

[davegmail]

My unit won't charge, replaced battery, ran power on / off tests with American Power Conversion. No luck. They want me to 'upgrade' it at $400+ cost. It should be fairly fixable, approx 4 years old.

This is as close as I could find:

http://www.eserviceinfo.com/downloadsm/3840/APC_Back UPS 250_400_600.html

Any suggestions? Thank you. Dave