After posting my question regarding problems with my Laserjet IIIp I did a
Google search and discovered:

    http://www.fixyourownprinter.com

Their archives had all the hints I needed to discover the problem was with
the surface condition of the feed wheels.  I cleaned them thoroughly with
alcohol and that solved the problem.   I put someone else's cartridge in and
that seems to have temporarily solved the horizontal band problem.  I also
cleaned all accessible contacts in case there was a problem with these.
Right now everything is working well.

The above link seems to be a great resource.   I also found a parts
supplier:

http://www.printerworks.com/


Bob Warasila
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