Maximum current Message #1 Posted by JLS on 10 Dec 2006, 6:25 a.m.
which is the maximum current sinked by the HP67 card reader motor when blocked ?
Re: Maximum current Message #2 Posted by Randy on 10 Dec 2006, 8:52 a.m., in response to message #1 by JLS
From page 4-24 of the 97 service manual:
Holding the card in place, adjust the eccentric for 180 +/-20 ma.
Re: HP67 motor - Maximum current Message #3 Posted by JLS (France) on 12 Dec 2006, 8:47 a.m., in response to message #2 by Randy
I know it's about 200mA reader working, my question is how much if the motor is blocked while reading (with clutch action and clutch glued) ?
Edited: 12 Dec 2006, 8:47 a.m.
Re: Maximum current Message #4 Posted by David Smith on 13 Dec 2006, 11:27 a.m., in response to message #2 by Randy
There is NO intended clutch action in the reader. The worm gear shaft IS meant to be firmly attached to the motor so that the motor stalls when the card is held in place. This is when the motor should be drawing the 180 mA or so. If your shaft slips, it WILL keep getting looser and eventually it will NOT feed the card.
This bit of advise was courtesy of a former HP FAE.
Re: HP-67 Maximum current Message #5 Posted by JLS (France) on 14 Dec 2006, 5:49 a.m., in response to message #4 by David Smith
Thank you
I thought this was mechanical clutch action, and i wondered if i could replace it with an electronic fuse like polyswitch
Go back to the main exhibit hall