Re: HP-65 card reader only reads cards Message #2 Posted by David Smith on 24 Feb 2004, 6:06 p.m., in response to message #1 by Michael Reinold
Most likely is a misadjusted write protect switch. These are the little gold fingers on the back of the reader assembly. When a card is inserted, the little nylon ball presses the finger against a pad on the back of the keyboard. There are three operation switches (MOTOR, WRITE PROTECT, and HEAD ENABLE). They should close and open in sequence as the card makes its way through the machine.
The adjustments can be quite tricky as the fingers only move a few thousanths of an inch. You need to trace the contacts to the keyboard connector pins and see if any switches are stuck open or closed. Usually you can adjust them with those tiny screws on each reader finger. Sometimes you must bend the fingers (woe unto you if you need to do this...)
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