SOLVED: W&W Rambox 32k current drain

[Hiwi]

Hi all,
i recently bought an old used W&W rambox 32k which was described as not working (defective and unknown state)

The box is an old version with dip switches for toggling the rampages / write protection

The HP-41 did not come up if the rambox is inserted. So i physically disabled all the pages and the HP was back to live.

The next step was to replace the backup battery. This was a fairly tricky part but at least it was sucessful.

I put a new Rambox32 module on the page 8 and the box was working fine. All rampages were enabled again and initialized. The builtin testroutine found no errors.

But it seems to me, that the box draws to much current. If i put in fresh batteries in the HP-41 it lasts only about 14 days until the BAT indicator comes up.

This does not seem be be normal, or does it?

Has anyone the shematics of this box or some more technical specs of it? May be a diode for switching internal or external battery is faulty, so it sucks the HP41 battery empty.

Ralf