APC BackUPS Pro 1400

[JarodTLG]

I got this little unit from where my wife works for free, when I plug the unit in nothing happens. nothing at all. no voltage coming from the outlets on it, no voltage going to charge the battery.
I found several small capacitors near the large chip that had been damaged by someone changing the battery from the looks of it, so I replaced them with caps that were the same value. this changed nothing.

Am I missing something obvious? or is this beyond repair? I know how to solder/desolder, I'm not super good by any means but I repaired a 19" lcd monitor I got from the same place, had blown caps, replaced and it works great.

I've attached some pics, I can take more if these aren't good enough or you'd like more detailed shots of certain components.

Thanks!

[seanc]

Re: APC BackUPS Pro 1400

Have you put a working battery in the unit? Some won't work without them.

[Toasty]

Re: APC BackUPS Pro 1400

sean_c is correct. These -will not work- without a good battery.

Don't mess with anything inside. There is -nothing- wrong with the unit. It's working as it was designed.

Battery pack is RBC7. My source is:
http://www.batterymart.com/p-12v-18a...ttery-2pk.html

Good price and prompt shipment in 3 years of dealing with them.
Shipping UPS Ground in 48 states is between $12 and $30.

Toast

[kc8adu]

Re: APC BackUPS Pro 1400

at least this is a decent one.the new ones are junk.
here is what i would do with it.
https://www.badcaps.net/forum/showth...hlight=apc+ups
most apc units of that era are good for extended runtime with large external batteries.

[Krankshaft]

Re: APC BackUPS Pro 1400

I wish they would at least flash the replace battery light if you attempt to start them with dead batteries.

I think this failure mode is intentional to spur the sale of a new unit.

Did you measure the voltage on the batteries? I believe at around 7-8 volts the unit won't even attempt to come on. Probably because the battery will draw too much current from the trickle charger.

[JarodTLG]

Re: APC BackUPS Pro 1400

You're all right, I don't have any batterys to try it with so I connected a pc power supplys 12v line to the battery and then to the board and everything else, plugged it in and got an obnoxiously loud beeeeeeeeep sound. So it is powering on but the power supply obviously will not put out enough power, I'll have to get a battery or something for it, probably end up doing like kc3adu suggested. I'll have to try it with a battery from my car or something
Thanks guys

[Krankshaft]

Re: APC BackUPS Pro 1400

Very bad move you made the battery charger in the UPS attempt to charge your PSU.

A little knowledge is a dangerous thing. Hopefully you didn't blow any fuses or destroy anything.

These units rarely ever die it's always dead batteries. Tests like this are unnecessary.

This unit uses two 12V batteries in SERIES that's a 24V input. Batteries in series are the sum of the individual voltages.

The only way you could supply voltage to the unit without a battery without risking damage would be to use some diodes to prevent the charger from attempting to charge your power supply. Then again as I said before you'd need 24V supply.

As for a car battery that won't work unless you have two in series to get the 24 volts also expecting the tiny trickle charger in the UPS to charge a large car battery will just lead to it triggering it's over current protection, giving up if the battery doesn't charge quick enough, or if the charger has no OCP the larger battery could draw too much current in it's discharged state and the circuit could overheat and destroy itself.

Properly sized batteries for the UPS are plentiful and relatively inexpensive on e-bay as long as you have the factory connection harness.

If you're in doubt ask questions we are here to help.