Dear All,
Best wishes to all of you here.... I am facing some problems with the APC SUA 2200 UPS system... The board PCB is "4G 3KVA PINTO TOWER Ass'y No. 640-0800E_REV05"... and have attached the pix of this....
The unit just starts, on pressing the ON button, beeps twice and shuts down, had the new battery replaced into it...same problems... then checked the boards, there were many electrolytic caps and smd caps (C105, C59 AND C64) with off values.... so had replaced them.... The MOSFETS on NS1, HS2, HS3 and HS4 have removed them and checked they seem to be fine..., however the resistor R11 (value 0.33E, 3W) had burnt out, this was replaced with same value....
There was a problem with Q 23 (marked as 12W- seems to be 2N7002 MOSFET as per smd code) near T2, but have yet to put it ON....
ON is pressed with only battery power, the unit just clicks (LED's come ON for a very brief moment say < 1 sec) and fan starts and shuts down...this is random behaviour...meaning to say that it occurs sometimes not all all time when the ON switch is pressed...
When unit is connected to POWER AC, and physical trigger given by just touching the areas around IC 13, Q59, Q45, the unit starts with POWER AC LED blinking and the unit enters the BATTERY ON state (that is provides power through batteries as if there is no AC present), when I remove the power and connect back again...the unit remains dead...
I am really tied up with this unit because of need of a schematic diagram.... Is this a software problem?
?? If so when is powerchute needed?
Can someone help me out with schematics / guides for the same will be grateful.....
Many Thanks in advance....
Karkera