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HP-67 read/write head



#6

Hi everybody:

I have an HP-67 that writes but doesn´t read. I think that it is a problem of the head. Sometime ago I read a post regarding the test of this head. I remember that it was tested with a voltmeter. Does anybody know where can I find that information?

Thanks in advance

Jon


#7

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.


#8

The bad cap is not the one across the motor. It is a small blue dipped tantalum cap usually located at one end of the reader board chip.


#9

Hi:

I am afraid that the head itself is damaged. I can read 50 ohms in blue-orange wires but the red-yellow widing is open (I don´t measure any value with the voltmeter). Bad luck

I have some HP-41 card readers and I see that the head is just the same. It seems to be glued to the plastic holder. Has anybody tried to use one of those heads in a HP-67?.

Regards

Jon


#10

When I had the same problem with my HP-41C card reader I used an old broken reader with a good head assembly and swapped it over. Gluing in a head from another machine will be difficult because of head alignment, but worth a try if you have no alternative. I don't know how easy it is to remove the old head from its base, but make some sort of marks on the base or a template before removing the old head to help align the new one. Good Luck!


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