Rebel Printer Won't Work with JetDirect Print Server

I have seven Lexmark 24xx Dot Matrix printers.  Six of them work fine with HP JetDirect Print Servers (Either a 500x or 170x).  The seventh worked for a while but now refuses.  I have tried a new print server, no good.  The printer will print fine when directly hooked up using either the parallel port or the USB port.  I have tried switching parallel cables.  Nothing seems to make a difference.  Any ideas would be appreciated.

Thanks.
cmmeierAsked:
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wyliecoyoteukCommented:
Could this be a firmware issue?
Do all of them have the same level of firmware?.
Other than that, it would look like a hardware error.

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cmmeierAuthor Commented:
The printers or the print servers?
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wyliecoyoteukCommented:
either:)
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cmmeierAuthor Commented:
Sorry for the delay.  Yes, all are on the same level of firmware.  I have suspected that it is a hardware problem on the printer but can't prove it.  Since it prints fine when connected directly to a PC on either the parallel port or the USB port, I would think that would rule out a port problem but I don't know.  I compared the set up to that of the other lexmark printers and see no difference.  I guess I just don't see what could have changed on the printer to make it stop working with the print server.
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wyliecoyoteukCommented:
Could be a memory failure in the print buffer, or a setting that stops bidirectional data.
You could try disconnecting the printer and doing a full memory reset from the keyboard.
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cmmeierAuthor Commented:
I think that it must be an internal printer problem.  I did a reset but it did not make any difference.  I will now say uncle.  I have a moderately acceptable workaround so I am moving on to other things.  Thanks for your help!
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wyliecoyoteukCommented:
Thanks for the points, sorry I couldn't help more.
Sometimes things just stop working- we have a printer that suddenly stopped accepting port 9100 jobs, but carried on accepting LPR - go figure.
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