APC ES 350 - continuous alarm

"Not so. This seems to be a common problem, and buying a $35 battery for a $50 unit will make you very angry when it still doesnt work. These should be recalled. According to APC, there is a 2-year warranty on this item. I dont know how picky they are with warranty cards as most people never register them.

The transformer inside is an autotransformer. It is usually NOT the battery, as the reviews of the $34.99 replacement battery on the APC site have lots of people complaining. There is a 40 amp fuse soldered on the control board. Mine wasnt blown, neither was my breaker tripped. Bench testing the transformer showed no output (should be 12 to possibly 16 volts, one lead runs to the + battery and the - battery connects to the board. The power charging the battery has to be rectified (made DC). There is another transformer on the board which is marked on the PCB ""40A/32v"" so its run through diodes or a half-wave rectifier and is probably the 16-volt charge to the battery I'd mentioned. I just took mine apart, I see no burning of any components, no smell, just that darned alarm. Only looked at it for an hour so far. There are free schematics on fileshare.eshop.bg but for the 250, 400 and 600...still looks the same."