Editing Tandon TM100-2 (section)

== Common Faults ==

* '''Drive belt failure''' — the single most common failure on a TM100-2 today. Replacement fabric-reinforced belts are sold by Console5, Best Electronics and others.
* '''Stepper grease drag''' — the lead screw lubricant hardens over decades. Symptom: the head carriage either does not step at all, or steps unevenly between cylinders, producing read errors that move with track number. Clean with isopropyl alcohol; re-lubricate sparingly with white lithium grease.
* '''Head alignment drift''' — after many years the heads may need re-aligning. A disk-based alignment tool and an analog oscilloscope are required.
* '''Track 0 sensor dirty''' — clean with isopropyl alcohol on a foam swab.
* '''Write-protect sensor failure''' — the photo-interrupter that detects the write-protect notch can drift; a permanently write-protected drive often has a dirty or failed sensor.