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HP41 Card Readers repairs



#2

I have repaired the "gummy" wheels on both my card readers and cleaned them thoroughly. One works well, the other pulls the card through fairly smoothly but shows "MALFUNCTION" or (rarely)"CHECKSUM ERR".

Does this mean that the magnetic head has failed ? Could it be something else - the switches between the PCB and card slot were disturbed but work well when the card is inserted ?

Thnaks for any any help.


#3

Make sure the head is cleaned. Also make sure the wires to the motor do not run near the head.


#4

David (and Randy),

I had cleaned the head with isopropyl alcohol but took it apart again and gave it light cleaning with a fine sand paper and Brasso. Now it works ! Thanks very much.

Charles


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