Question about Powercom (BNT-1500AP) UPS System

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Need some parts for BNT1500AP

This ups has a burned capacitor. I need a technical manual that shows parts of this equipment. I need to check the technical details of parts needed to fix it. Where or how can I get this manual? I will appreciate any help. Thanks. Wilfredo.

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Re: need some parts for BNT1500AP

Sorry to disagee with Jackboy, but generally, capacitors are standard, off-the-self components, that can be purchaded in any good electronics/components store. Unless the TRACKS of the PCB are badly damaged, and there are too many other components damaged, then PCB repair is often possible and successful. Just ensure you obtain the CORRECT SPECIFICATION for the replacement component. I don't just mean the type, size and value in MFD, but OPERATING TEMPERATURE are also important for things like capacitors.
I AM assuming you can read the original values off the failed component (not always possible I know) TD

Posted on Jul 29, 2010

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Re: need some parts for BNT1500AP

If you can find a manual - you probably will not find parts- total board replacement or unit replacement is your only route Do come back to tell me I am wrong - it will be invaluable info for all of us.

Posted on May 17, 2007

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Chargeing circuit and inverter apc backups

Because the equipment usually protected by a UPS (computers, etc) is sensitive to all kinds of power issues, you'll really want to be able to confirm any repairs you do. If you're not set up for that, it would be much safer to either have APC test and repair it, or if it makes more sense financially, just replace it. Prices have come way down. They haven't reached the level of toasters or VCRs, as far as being "throw-aways," but they're getting close. Just save the batteries.
Assuming it's not still under warranty, you can try fixing it if you have good electronics/electrical training, and the test equipment needed to both troubleshoot AND test it after repairing.
If you have access to the schematics for your unit, that's a major plus. If not, you will have to do a really good visual check, and then have to verify every diode and transistor individually.
Problems with charging circuits usually end up just being a couple of diodes. Inverters blowing up will usually show obvious damage. A good visual inspection of the unit in general, and the transistors on the heat sinks, will typically show obvious damage (transistors burned, or missing chunks). When I was working in the R&D lab for a UPS company, I would always replace all of the transistors on a given heat sink, even if only one tested bad. Your 900va unit probably has four large heatsinks, with 3-4 transistors on each. Make sure you use the same kind of transistors as replacements, unless you have really good info on allowed alternatives from APC. Stats sheets are not good enough, and you might just have it blow again. Also, sometimes the heatsinks are shared by two or more circuits, so a damaged transistor, if unreadable due to damage, might not be the same as the others on the same heat sink. Verify, verify, verify.

May 17, 2015 | APC Back-UPS® XS 900 (BX900R) UPS System



Uninterruptible power supplies provide protection against mains power faults to computer equipment.
These faults include voltage spikes/interference, over voltage and under voltage, mains supply interruptions and surge protection etc.
These faults can cause computer and electronic equipment that are connected to an unprotected mains supply to malfunction and/or sometimes fail.
A common problem, when burning Cds, DVDs etc. any slight power interruptions to the burning process will halt the recording process and rendered the disc useless.

There two type of Uninterruptible Power Supplies
The lower powered and cheaper type UPS are switch-over types, when the mains supply fails, the UPS switches over to the batteries and inverter in milli-seconds which then supplies mains power to the computer and peripherals. A faulty inverter circuit and or flat batteries won’t deliver standby power when the mains supply fails.
NOTE : The mains waveform from these UPS is a pseudo sine wave (i.e. not a true sine wave).
The true UPS types are usually the higher KVA units (over 1500 VA) that supply continuous mains power. The mains power is connected to a charger which charges the batteries and then the inverter draws power from these batteries and converts it to true sine wave mains power to the computer equipment, therefore there is no switch over time lag when the mains supply fails.

on Dec 06, 2009 | UPS Battery Backup Systems

1 Answer

Im looking for a dixon tms8 circuit diagram

Are you trying to repair it? If so you dont need one. Test the mosfet to see if they are shorted. Replace all needed, look on board for bad components, such as bad or leaky caps, burned diodes, check other parts around each one. Check in transistors for short or opens, replace as needed. Look for input caps swollen etc, etc. they are all built almost the same way, some with better parts cheaper ones with lesser an weaker parts.

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1 Answer

IS-WEBRT3 password reset

Call Liebert technical support, in most Countries I think they publish freephone / low rate numbers. Check your equipment manual for the number or look on Liebert web @
If you can not find one post back here with an email I can send more info to.

Hope this helps,thanks for using FixYa

Vote for this if you like it.

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1 Answer

O/P Short System not maintaining connected equipment

You are correct. Make sure you have checked your fuse. Please Email me at and I can get you a user manual. I will need to know what size UPS you have also. Is it a 1.5KVA or 1500VA or bigger?

Oct 04, 2011 | Eaton Powerware® 9120 UPS System

1 Answer

I have model G1010USB battery backup and it has been plugged in for more than 48 hours and the battery capacity has never changed and showed it the battery is charged up or not it, the boxes just stay...

Is this unit new or used? Either way, the first thing to check is if the battery is plugged in. UPS units are shipped with one of the battery leads disconnected for safety purposes. Please remove the front plastic bezel and verify the battery is plugged in. If it is new, and you followed the instructions correctly, you could have a bad battery or charging unit in the UPS. Please contact technical support for the manufacturer.

If you have a used UPS, disconnect the battery connections and use a multimeter to check for existing voltage on the battery. If it is completely dead after a charge cycle, it is quite possible the battery is bad and needs replacement.

Mar 05, 2011 | Tripp Lite HT1000UPS (037332125262) UPS...

1 Answer

Burning smell came out from the device.

Shutdown the equipment connected to the UPS, disconnect the load and remove the main power to the UPS. Open the UPS to see if you can see any sign of burning component. Confrim that the UPS is not Overloaded before the shutdown. If you are not an experienced techinician with UPS please contact an experience Technician because there are life Voltages in the UPS which can cause electric shocks.

Jun 17, 2010 | UPS Battery Backup Systems

1 Answer



As you have mentioned that the light are glowing shows that it is not a hardware circuitry problem.

I think that you have to check the battery of the UPS and replace it if needed..

To me it doesn't seems like a circuitry problem.

Thank you

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your problem could be related to a dispay board or possible CSB board.

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Doesn't start and shows "Failure..." on display

Hi, a couple of things you can do but may I first suggest you bring it back to the Technical Support people who replaced the battery and voice your issue. The new battery might have to be replaced (don't be surprised) and you may have certain warranty claims that may be void if you try opening the UPS yourself. If for some reason you want to do it yourself, then you have to open the UPS and check the circuitry including the new battery. You need to be familiar with the use of a multitester (VOM), working with HOT circuits and general electronics. You have to start with any fuses, circuit breakers, relay, SCRs, transistors, etc. If you are not that comfortable doing so, guess were back to the first paragraph. Hope this be of some help. Good luck

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