Posted By
Chicken
on 2012-06-08
03:54:40
 |  Re: 1551 maintenance
Do you have another working 1551 drive? Then you should test the drive mechanism and the paddle (that's the cartridge that connects to the plus/4) separately with the working parts. Everything can be disconnected without soldering 
From what you posted, it seems like the paddle is ok. If you are lucky then it's just a misaligned head (though, from experience, this is not a typical 1551 problem). I'm not into electronics but some time ago crock posted how you can check if the head is defunct.
http://plus4world.powweb.com/forum/22065
"If you think the mechanism is trashed, check the resistances across the wires to the read/write head. It should be between 12 and 25 ohms across any combination, anything significantly higher means the head is toast."
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