Thank you gentlemen for you help. I have down loaded the schematic you
mentioned and I will study them.
The battery is being charged when the mains is connected but there is no
load on the battery when you remove the mains. Thank you gentlemen for you
help. I have down loaded the schematic you
mentioned and I will study them. The battery is being charged when the mains
is connected but there is no load on the battery when you remove the mains.
The battery stays at about 26 + volt and no output.

Regards

Russell

"Nelson" wrote in message
.com...
On Thu, 1 Jun 2006 03:37:31 -0400, Jeff Liebermann wrote
(in article ):

Nelson hath wroth:

On Wed, 31 May 2006 11:39:25 -0400, Jeff Liebermann wrote
(in article ):

[snip]

I've repaired a substantial number of APC UPS's. In the overwhelming
majority of cases, it's a dead or dying battery.

Hmm, then maybe you can help me :-) I have the opposite problem, ie
the APC UPS (BP 1400) switches to battery within minutes of being
plugged in (sometimes immediately) and never switches back.

Hmmm... I have no idea what that can be without first looking at a
schematic of your BackUPS 1400. I'm looking at the BackUPS 600
schematic. There's an LM339a comparator section that determines if AC
power has been lost or restored. A big capacitor on the inputs for
noise reduction. Kinda sounds like the initial time delay in going
into battery backup operation is the charge time on these caps. My
guess(tm) is that the cap is leaking.

There's
nothing wrong with the AC as far as I can tell. I've pulled the PC
board but it looks like a major project to trace it out and it looks
like there are some custom chips on there anyway. Of course you can't
get a schematic from APC and of course they want more to fix it than a
new one would cost.

Can you read Russian?
http://www.eserviceinfo.com/
Try "APC" in the seach box. Hmmm... only the Backup 250, 400, and
600. I don't know how close these are to BackUPS 1400 but they might
offer some clues. I suggest you grab all of the APC schematics and
dig through them for clues.

Yeah, I found those a while back but they don't look much like mine
(which is kind of old). It's been sitting in the closet... maybe I'll
haul it out and try again. Thanks for the suggestions.

--
Nelson