From: William Levak (wlevak_at_cyberspace.org)
Date: 2004-06-16 15:11:27
On Wed, 16 Jun 2004, Marko [iso-8859-1] Mäkelä wrote:
> Hallo Eberhart,
>
> I'm forwarding your enquiry to the cbm-hackers mailing list, as I do not know
> much about printer mechanisms. Have you checked Schaltungsdienst Lange in
> Berlin for the service manual?
>
> Marko
>
> On Tue, Jun 15, 2004 at 03:35:56PM +0200, Eberhart Bockhorst wrote:
> > hi there,
> >
> > my old commodore printer does not work correctly, as it always
> > does linefeeds in the middle of the line.
> > therefore i'm looking for some technical information for this printer,
> > espacially schematics or the service manual. this old printer has an
> > epson printer 3110 inside and the mechanism for linefeed control
> > does not work correctly, because the controlling magnets are always
> > on, they are never turn off.
It has been a long time since I worked on one of these.
First check for a mechanical problem, jammed or worn gears, jammed or
defective sense switches.
After that, the possibilities are: defective interface chip or driver
transistor that controls the advance mechanism.
On some of these older printers (I don't remember which), there was a
metal tab attached to the drive belt that moved the head back and forth.
This tab tripped a sensor at the end of the carriage. If this belt
slipped, it would not indicate the end of the carriage correctly.
Some of these printers (again, I don't remember which) used opto-electric
sensors. A bit of dust blocking the sensor, or on a moving part that
could block the sensor, can cause the sensor to trip when it shouldn't.
Clean all the dust and dirt out of the mechanism.
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