View Full Version : otrona attache not turning on power supply buzzing quietly.

October 18th, 2012, 10:04 AM
i have two otrona attaches one works the other makes a quiet buzzing noise i assume its the psu because when i hook up the other ones psu to it it works fine is there any way i can rebuild the power supply because i probably wont find a replacement.

October 18th, 2012, 01:20 PM
The Otrona PSU is fairly complicated, but I suspect an electrolytic capacitor or two are at fault. You might want to check the +5, -12 and +12 outputs to see if any are shorted to ground--that will give you a clue as to where to start looking. At any rate, if you haven't discovered them already, the schematics are here (http://oldcomputers.net/Attache_Schematics.pdf).

October 18th, 2012, 01:52 PM
(Forum mods, please move this to the CP/M section...)