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HP-65 card reader problems
02-16-2020, 11:42 AM
Post: #16
RE: HP-65 card reader problems
(02-16-2020 11:09 AM)AndiGer Wrote:  Reading the thread I am thinking as it is not mentioned:
Did you check the motor switch closing when inserting a card? Carefully cleaned the contact?
It seems not so convenient to measure as on the 97 card reader with it's test points but should be possible ...
Andi

Very good point. I mentioned this in previous post, but wasn't pursuing it earlier because of the mentioned symptom which I took to indicate that the motor was trying to move.

> The drive shaft does move axially but won't pull the card and I only measure
> some 50mv across the motor terminals

To be safe, remove the battery and CPU board, and with an ohm meter just measure from the keyboard pins, the pin I mentioned to GND. It should short when the card is inserted.

And my apologies, the CPU board pin #9 name is MTRS not HDS.
GND is pin #14.

cheers

Tony
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Messages In This Thread
HP-65 card reader problems - coitboy2000 - 02-02-2020, 01:59 AM
RE: HP-65 card reader problems - teenix - 02-02-2020, 06:03 AM
RE: HP-65 card reader problems - teenix - 02-02-2020, 09:44 AM
RE: HP-65 card reader problems - teenix - 02-02-2020, 11:38 AM
RE: HP-65 card reader problems - teenix - 02-04-2020, 02:46 PM
RE: HP-65 card reader problems - teenix - 02-16-2020, 07:14 AM
RE: HP-65 card reader problems - teenix - 02-16-2020, 10:16 AM
RE: HP-65 card reader problems - teenix - 02-16-2020, 10:33 AM
RE: HP-65 card reader problems - AndiGer - 02-16-2020, 11:09 AM
RE: HP-65 card reader problems - teenix - 02-16-2020 11:42 AM
RE: HP-65 card reader problems - AndiGer - 02-23-2020, 06:47 PM
RE: HP-65 card reader problems - teenix - 02-23-2020, 09:19 PM



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