Re: HP-67 read/write head Message #2 Posted by Randy on 10 Dec 2004, 8:15 p.m., in response to message #1 by Jon
How do you know it writes properly? If you've tested the recorded card in another unit and it works, that problem is usually caused by a bad bypass capacitor across the motor.
You'll find LOTS of postings on the subject in the archives, the easiest way to start is to search for posts by David Smith and Tony Duell. Tony posted
an article on 67 internals here: http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/articles.cgi?read=394
At the bottom of the article, he lists the color coding of the head leads, each winding measures typically 50 ohms. If one is open, it will not write properly which lead to my opening question.
|