Re: apc SUA1500 Repair

That's not quit right. The zip file on my system shows 9.0 KiB(9,242) bytes. and the APC1500G.BIN files shows 16.0 KiB(16,384). The extra 384 bytes in the APC1500G.BIN file just reflects the true file size. I guess just like 1 meg of memory is really 1024 KiB. In any case I double checked the file I copied from the device and it is correct, also it burned correctly to the new device which was also 16k(same part number as original). The unit has been working properly since the repair. I checked the output voltages both while on wall power and when on battery,...

Re: apc SUA1500 Repair

I just checked the file on my system and it shows 16k, both the original and after I unzipped it. The zipped file shows 9k. Is that what you see?

Re: apc SUA1500 Repair

Yes,
I thought the same thing when I tried reading it in my burner, but it copied OK to the new device. Attached is the bin file I used to burn the new processor....

APC SUA1500 Ups problem.
This ups was in the junk pile for a high pitch squeal whenever the unit was plugged in. Found a apparent short at one of the caps near the micro-controller. After de-solder of the suspect cap, the short appeared in the pc board where the component was removed. Traced this back to the micro-controller. After removing the micro-controller the short was gone. The micro-controller is a P87C51FB-4A. I was able to read the program code off the damaged micro-controller and burn it to a new P87C51FB-4A. Installed the new micro-controller and re-soldered the cap. Unit now...

Re: New Members - please post your introductions here

Hi, I just found this forum while searching for fixes for a APC RT6000. I have been working in the electronics field for over 20 years. But trying to troubleshoot these APC units without a schematic is always a challenge.