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Reply-To: "George Gonzalez"
From: "George Gonzalez"
Subject: Re: X Y Plotter Help Needed
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
NNTP-Posting-Date: Wed, 11 Sep 2002 12:47:02 GMT
Organization: AT&T Broadband
Date: Wed, 11 Sep 2002 12:47:02 GMT
I suspect the pen-up-down circuit isnt too fancy,
it should be amenable to wire-tracing with a flashlight
and a bit of wire-tugging and cursing. You might find at most
a grounded-emitter power transistor driver and a bias resistor or two.
"Al" wrote in message
> I recently rescued an Allen Plotomatic 715 from our local recycling
> center. It had been modified. I was able to restore all of its functions
> except one.
> Pen up and down does not work. The wires had been cut off the actuator
> switch. Does anyone have a schematic of this beast? It uses 709 op-amps
> date coded for 1976. Whew! But it's nice. Built like a tank!
> Thanks in advance.
> Remove * from the address to reply.
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