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IBM 6400 MODEL 9

Customer claims the message 'end of forms' displays every time a 'file' is sent to printer even though there are forms loaded in the printer.

When the forms are removed from printer, the printer will give an alarm condition and display 'load forms'.

I have not been to customer site as of yet and cannot give you any more information, but thought you folks might be able to give me a 'heads up' on this situation.

Thanks for your attention to this matter.

Don Perry

Posted by on

  • allotaspud Jan 10, 2008

    Finally got a chance to look first hand at the 'end of form' problem with the

    IBM 6400 model 9.

    The printer will print several pages and then give an end of form message even though there are forms still loaded. The end user will press the Stop

    Button then the Start Button and printing will proceed and it will print a few

    more pages or may print only one or part of one before issuing the same message again and printing stops.

    I am currently trying to acquire a Service Manual for this printer.

    The end of forms sensor located between the platen and printhead is a

    unusual configuration. It appears to be a photo-optic wheel (regularly spaced cut-outs in the wheel) which is turned by the paper as it line feed upwards during the printing process. This wheel is held by a spring loaded

    arm which is moved back by the pressure of the paper being loaded.

    My question: are there two sensors involved here? I assume that the motion of the wheel as it is being revolved by the paper accounts for one sensor, but is there a sensor involved with the action of the arm holding the wheel when the paper does run out? The action of an arm or lever when paper runs out is something I am more familiar with. This rotating wheel is new to me.

    Thanks for very much to 'Machone' and 'Jackboy' for their responses for my earlier questions concerning this machine.



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The sensor with the wheel is the paper motion sensor, The other one is the paper present sensor. Apart from these sensors needing a clean they never really go wrong. However, if your printing on black backed or shiney/reflective paper i.e labels the paper present sensor can cause problems as it cant get a reading. there is a fix for this, reseat the sensor 90 degrees so that its facing the wheel sensor. On the wheel you will see a 'flag' which moves in front of the sensor when paper is inserted, you need to paint this flag white (tipex will do) job done, seen this problem quite a lot.

Posted on Dec 21, 2009

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This seems like a micro switch or sum such is not making/is making when it should or not.
The from load in a stack in the base to I guess there must be a wight sensitive device under the load platform.- stuck in or out.
Take a look at the web site.

Posted on Dec 17, 2007


Try taking canned air and blowing out the sensor. The wheel turns as paper moves, and the optical sensor sees the slots going by and knows it must have paper. If it doesn't see the slots anymore then there must be a paper jam.

Posted on Jul 31, 2008

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Have been through this with a 6400 a few times, Jackboy is correct, it's a sensor which has gone belly up and needs to be replaced. Had to get an engineer to resolve it, not a major job as far as I am aware, however if you have never done it before seek advice. That is the only way to get rid of the message permanently.

Posted on Jan 07, 2008

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