Quantum Q20x0 drive have a rubber bumper on the stop used to limit the head
movement. The rubber in these drives has deteriorated and frequently prevents
the heads from moving when the drive is powered on. Normally after the
drive is up to speed the drive goes through a seek pattern to calibrate the
drive servo. The heads can be freed by pulling up the yellow sticker
near the heads and then pulling them to free them from the sticky rubber.
This does not fix the deteriorated rubber so it will likely cause more
problems. The data on the drive was recovered using my
MFM reader/emulator. Another drive had unreadable
tracks. I tried recovering the data by pulling
the head servo but the data was erased so was unable to recover.
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Gooey bumper ( 49K) How to unstick ( 51K) smeared ( 65K) Another bumper ( 60K)
Feel free to contact me, David Gesswein email@example.com with any questions, comments on the web site, or if you have related equipment, documentation, software etc. you are willing to part with. I am interested in anything PDP-8 related, computers, peripherals used with them, DEC or third party, or documentation.
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