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HP 41CV card reader - Printable Version

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HP 41CV card reader - John Bjornholt - 02-04-2009

Does anyone have any technical info on the HP41CV card reader, such as schematics, block diagrams, trouble-shooting procedures, etc? I recently sucessfully repaired the drive wheel on mine, but now I get a "malfunction" display when it tries to read a card. I have an o-scope and other necessary test equipment to check for waveforms, voltages, etc.


Re: HP 41CV card reader - PeterP - 02-04-2009

IIRC, TOS has the Card Reader Repair Manual from HP. Also a Google on 'repair card reader site:www.hpmuseum.org' or something along these lines will bring up many threads with potentially useful information. There recently was one where a defect cap was the source of reading problems.

HTH

Cheers

Peter

Edited: 4 Feb 2009, 12:03 p.m.


Re: HP 41CV card reader - Roy Welch - 02-04-2009

Peter, what is the IIRC and TOS? I also need to get the LED part I discussed with you. Maybe a schematic or parts list is available.

Roy


Re: HP 41CV card reader - Jeff O. - 02-05-2009

IIRC - If I Recall Correctly

TOS - That Other Site. Another HP related web site. It is a long story, but suffice it to say that out of respect to the owner of this web site, links to and direct mention of the name of that other site is not done.


Re: HP 41CV card reader - Roy Welch - 02-05-2009

OK, thanks. The LED is an IR type I'm told. The lens of the LED was shattered so I can't see the flat side showing the polarity indication. That's why I need the schematic.

Roy


Re: HP 41CV card reader - Carl Vanden Bulcke - 02-09-2009

Hi,
I have a similar problem with the drive wheel where the friction wheel seems to have "dissolved". Could you let me know how this could be replaced/repaired? Are parts still available from hp?
Thanks for your help!
Carl Vanden Bulcke _ Belgium


Re: HP 41CV card reader - Michael de Estrada - 02-09-2009

This is commonly referred to as the "gummy wheel", and it can be repaired either with plastic tubing or O-rings. There are several articles under the "card reader repair" heading in the articles section of this forum. You can find suitable O-rings on ebay, and I have had success with this method on several card readers. Parts are not available from HP. Also, I don't know if the HP-41 series card reader has a motor clutch similar to the HP-65 or HP-67, but if it does, it may also need repair.


Re: HP 41CV card reader - Ignazio Cara (Italy) - 02-10-2009

The coupling between motor shaft-worm gear is surely the same of 65, 67 and 97.

regards

Ignazio