TRS-80 video synch chaos - test-drb@ccmp.vtda.org

9 Jun 1998

<Characters lean to the right, and the display moves all over the screen.
<Usually the motion is quickly to the left while also moving upward, thoug
<sometimes it stabalizes and just moves upward.
<
<Is there an adjustment to control this somewhere?

Yes in or on the monitor.  The system board video is clocked off the 
system crystal and stable.   There are two adjustments for H&V position 
but they aren't likely the problem.

The common problem is the monitor either the 4n25 opto isolator in the 
interface or more common video problems that tubes incur.

Allison