Fuser error.  Replace the fuser.  It's easy to do.  I believe on that
model you just flip down the rear output tray, remove a couple screws,
and slide it out.  Laser Products has it as an exchange part for $65 or
repair yours for $55.  800-786-8897.  I've bought from them and have
been happy with their pricing and service.

Larry Fisk wrote:

> Working on  a Hp Laserjet 4
> Getting error message : 50 service
>
> Any simple things to check or does this
> mean something in the circuit board is bad.
> Tried reseating the fuser unit,etc.- no joy.
> Sending it to  a HP service center would
> probably cost more than it's worth????
>
>   Looks like it hasn't seen too much service,
> it's clean as a whistle inside.
>
>      |
>   --|---------------------------
>      | ><>  Larry  Fisk   <><
>      |      Fisk Computers
>      |      Fruitvale, Idaho
>
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