[sjt99]

Hey guys! 
I have a expansion box with a 5.25" disk drive model PHP 1250.
After I had aquired the expansion box, I had no trouble with it and was able to read and write programs on the disk drive as well as use disk manager. Unfortunaly it wasn't but too long that I got to play to play with it. Just randomly one morning it started giving me an error saying that none of the disks I have are initialized. When I try to initialize a disk it seems to be writing to it with no problem and then gives me error 31 (record not found on input). 
I tried cleaning the PCB (seemed to have some white corrosiony powder on it). I tried also cleaning the read/write head, but I'm getting the same error. 
Any thoughts? 
Thanks!




It's the corcomp diagnostic cartridge that can test speed and stepping