HP-65 card reader repair - can't write card, but can read

[Geoff Quickfall]

Okay!

Can you test the card in another hp65?

Did you check the current draw on the motor when adjusting the motor -or- did you try the hit and miss card read write then turn the eccentric. The second method is more time consuming. There may be a very narrow range of read and write on the eccentric adjustment.

Other factors, motor speed, magnetized head, dirty head, bad card.

Clear the program memory, run a blank card through to write a blank card. Then switch to run mode and insert the card. Still blinking?