Odd 1050 issue - any ideas?

[djmat56]

Hi all. Have a 1050 with the mega speedy mod. Works kind of fine. When first turned it reads and writes single density without issue but try to read or write enhanced or double and it fails. If used for a while to get "warm" it eventually starts to work with all disks so i know its not the read head or motor. Any ideas for this behaviour? I have a set of new caps ready to go in but don't want to do this unnecessarily.

[_The Doctor__]

check power levels from cold error time against hot working time. grab the FSM off of Atarimania that should help with all of the test points and such.

write down the differences from them, and that should point you to the problem area

[TGB1718]

Possibility that the RPM if slightly off, as it's a Speedy Mod, not sure what utility you would need to check this.

[djmat56]

I've checked the rpm and its bang on 288 so don't think thats the issue. Will check voltages and post on here when i get chance

[sup8pdct]

sounds like temperature drift of the pot that controls the data separator. Will need an scope to set up properly. tho can be fudged.

[+Nezgar]

22 hours ago, sup8pdct said:

sounds like temperature drift of the pot that controls the data separator. Will need an scope to set up properly. tho can be fudged.

This post/thread details the calibration process: