Hello List,

I'm sorry to bother you all with this question, but I am running out of
ideas..

Recently my friend and I bought an HP 7475A plotter and slightly modified it
for prototype PCB drawing.  The problem is, we cannot get the plotter to
work with hardware handshaking, even though we made the cable according to
manufacturer's specs.

When we try to print, everything goes well for the first few seconds, then
ERROR light starts to blink, and plotter begins to draw mysterious geometric
shapes.  If the drawing was simple enough, say a small square, nothing like
this happens (no buffer overflow).

I know there is a way to switch the handshaking mode using buttons on the
front panel.  Does anyone know which ones?  I would really appreciate any
help!

Thank you for your time,

Vitaliy

http://www.hp.com/cposupport/prodhome/7545a.html

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