HP 9872T Trouble Shooting

[husmann]

Last week I obtained a HP-9872T plotter in very good condition. In my dreams it will be controlled by a HP-41 (Plot Module, HP IL module, HP IL/HP IB interface) -- some day.

Unfortunately the HP-9872T does not initialize correctly when powered on (see short video http://www.huswelt.de/MoHPC/HP9872T_PowerOn.mp4).

Does someone know how to fix this, or knows someone who knows… Any hint is highly appreciated.

Thanks in advance.

Wolfgang