Basically a DC to AC inverter with voltage and current protection circuits.
However there are also wave shaping circuits in the AC production section of
the device. In-depth troubleshooting and diagnostics may result in
determining what device is causing the fault however getting appropriate
replacement components may be the challenge. BE advised, the circuitry
produces voltages that may be considered lethal when in operation. Follow
all the safety rules endemic to this kind of service. IMHO: APC makes some
rather nice products, almost all are not consumer serviceable.
Like saying you won't purchase a particular type of soft drink because it
gives you gas and you are uncomfortable as a result. Of course, Neither
Pepsi not Coke will sell you a complete listing of their ingredients?
"Luke Siemaszko" wrote in message
...
We have an APC UPS that has gone faulty.

APC will not supply a circuit diagram, and do hnot have a repair
facility - their advice is to throw it away and buy aa new one.

If I do that, it certainly won't be an APC one that I buy.

In the meantime I'd still l ike to try and fix the one we have. Has
anyone got any experience of this, or any schematics even?

thanks