On 13 Sep 08 at group /sci/electronics/repair in article
) wrote:

My Hp laserjet 2420 keeps printing engine test until its
out of paper. The problem will not even stop after powering down for
several hours.
This problem occurred after replacing the small 24 volts fan. Even
just after that it worked fine, it was able to print a self test,
config. test and a log file but after boxing I had this problem and
shows this massage 'PRINTING ENGINE TEST" and will start printing
horizontal lines on the paper until its out of paper.
What might b the problem pls help. Thanks

Don't know the 2420. Is there a special button for the test which is
activated by a misaligned box and/or faulty cable, connection, plug...,
telling that the test is needed? Or a misplaced (too long) screw kills a
cable, or a cable is squeezed...

So remove the box and check again.

Saludos Wolfgang

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