If fit is like the plotters I used in college, there are wires that the carriage slides along to sense its position - clean them carefully. The symptom is "vibrating" or spastic motion of the x r y carriage. The other possible problem if it is vibrating could be the damping adjustments.
Cheers!
Bruce
oting Steve Dench <sjdench48@...>:
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Hi, would anyone have a schematic for the HP7004B plotter, I went to use it the other day to do some plots from my 141T and it no longer wants to play the game. I checked all the electrolytic capacitors (considering its age) and replaced some to no avail, all I managed to do was introduce another fault, pen solenoid no longer works. Original fault was X very unstable. All that I can find by searching the internet was a user/operator manual.
Thanks Steve.
