IO-4510 scope restoration update

[Alex [Temple-Heath List]]

I got the two traces back, and vertical position controls are now 
working too. The problem was related to the +15V push-in pin on the 
vertical input board, which was not making proper contact due to 
slight corrosion. Jiggled all the pins in and out a few times and the 
problem corrected itself. I also now can properly center the trace 
with the horizontal position control at about midway. The focus 
problem was solved by replacing R601 in the focus divider, a 680K 1W 
resistor that was measuring over 1.5Mohm. Also, R603 a 82K 0.5W 
resistor part of the same circuit, went to 105K, but I did not have a 
replacement on hand, so for now it will stay put. In any case optimum 
trace focus is back to about halfway of the focus control.

Still need the IO-4510 calibration/user manual, hope someone can help me.

-Alex

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