It helps for the analog section. Thanks

This should be the signal at P6 or the ch1 output BNC (my scope has a mod to send the digital SAVE signal to that BNC instead)

P6

0.2V/DIV cal signal input both probes.

I have little access to the preamp board from the top.

How are you, I have the same thing, but everything is disconnected from the inside, could you not take more photos of it, please?

Moderator edit: new thread created from this.

 

How are you, I have the same thing, but everything is disconnected from the inside, could you not take more photos of it, please?

Moderator edit: new thread created from this.

That old scope is buried in a box in a shed now. Look at the service manual on the first post of the original thread.