HP-82104A Card Reader Repair Questions

[Hiwi]

CARD ERR and MALFUNCTION message are in most cases mechanical problems with the contacts, may be there is some gum or dirt in the reader. Try to clean the contacts very cautious. They are located under the top pcb over the head mount.

And there is a small hole for the IR diode, clean this as well, since there could be some gum or dirt located.

The other message is CHECKSUM ERR, this may occur when teh speed is deadjusted to much.

Ralf