41C Card Reader Won't Run

[Ron]

My 82104A won't pull the cards through. I took it apart, and put a battery direct to the motor, and it runs fine. It just doesn't seem to know when I insert a card. Any suggestions?

Thank you.

Ron

[Dan Grelinger]

Assuming that the motor is not even running when you insert a card, I might guess that one of the card sensing contacts is dirty. When you insert a card, does the HP-41 display give any error message? If it does not, then I would be even more suspicious of a bad contact. It is also possible that the ROM or the connection to the -41 is bad. You should be able to do a good check of this by executing a catalog 2. If the Cardreader functions display correctly, this can probably be ruled out.

If the motor runs when a card is inserted, but the card is not pulled through, it is the "gooey rubber roller" syndrome, very common. The rubber drive roller needs to be replaced.

[Ron]

We're on our way! It was dirty contacts. The motor now runs when a card is inserted. Now off to to the hobby store to fix the gooeys.

[Dave]

Ron,

Should you need a fix for the roller see my post along with Jerrys' on about 11 april this year for the model airplane fuel tubing fix.....should you need a piece drop me a line and I'll send you enough to do the job for the exorbitant fee of a picturesque postcard from your neck of the woods. Haven't forgotten about you Jeff D., guess the mail lost it. Sending another shortly. VIVA la 41!

[Ron]

If I can't find what I need, I'll let ya know. Thank you for offering.