my d75 turns on ok. runs several (10-15) minutes, trace fades away. I think the power supply is failing, but have no schematic. This scope has been idle for months and I suspect some electrolytics are failing.
Turning scope off for several minutes recycles things and it starts anew.
Boat link does not have a d75 schematic, any help out there? Tom Poteat

 

Hello,

You just hijacked an existing thread:
http://forum.allaboutcircuits.com/showthread.php?t=42754

Now you have a thread of your own.

It looks like something is getting hot and stops working.
It could be some capacitors that are worn out.

Bertus