emulatorII-list

Has anyone in here adjusted/calibrated the EII PSU themselves in order to output the correct voltages?

I have an EII that has a floppy reading problem. When a disk is inserted I received the "Insert Disk" message with the floppy lights flashing alternatively. I already cleaned the heads. The drives are fine as well, as I swapped them out with my other working unit as I did the floppy ribbon cable. 

John (JMP) here in the forum indicated that he onced faced the same issue and after a technician tweaked the output of his psu the drives came back to life. I suspect that the same might be the case here. I believe I'm  technically savvy enough with a multimeter to undertake that procedure and some guidance of someone who has already done it.

Any help appreciated. 

Thanks in advance.

George

All I can say is never touch R109 and R110 variable resistors. They don't affect the main voltages and there's no available calibration procedure on the web for re-calibrating them. So beware...




--- In emulatorII-list@yahoogroups.com, "trickstar303" <trickstar303@...> wrote:
>
> Has anyone in here adjusted/calibrated the EII PSU themselves in order to output the correct voltages?
> 
> I have an EII that has a floppy reading problem. When a disk is inserted I received the "Insert Disk" message with the floppy lights flashing alternatively. I already cleaned the heads. The drives are fine as well, as I swapped them out with my other working unit as I did the floppy ribbon cable. 
> 
> John (JMP) here in the forum indicated that he onced faced the same issue and after a technician tweaked the output of his psu the drives came back to life. I suspect that the same might be the case here. I believe I'm  technically savvy enough with a multimeter to undertake that procedure and some guidance of someone who has already done it.
> 
> Any help appreciated. 
> 
> Thanks in advance.
> 
> George
>