I've revived this old thread because the link provided in it no longer has a service manual for the CFG250, CFG253 or CFG280. I'm hoping somebody has a stored copy that they could post to me. I did found the operator's manual, but that doesn't have any schematics.
I picked up three (3) CFG253's in As-Is condition and would like to know what voltages should be on the connector from the power transformer output where it plugs into circuit board input connector. I'm guessing +/- 30V and maybe some other voltages.
The first unit that is 100% there seems to have a blown transformer and I would like to use an external supply to see if the main board powers up and works if supplied from my dual output pwr supply. Or if I need to use more than two (2) voltages.
Haven't had time to jumper 120VAC to the other two units, both are missing input pwr cord jacks, to see if one or both has a good transformer. Will try that today since I hope to have free time. But in any case, having a schematic would be nice if possible to figure out any other circuit problems after I can get power to each one.
I followed up with trying to acquire the CD from this link, but email address is not working:
https://groups.io/g/TekScopes/message/14713?p=Created,,,20,2,0,0