The floppy mechanism consists of a PCB with drive rotating motor, stepper motor for the read/write head, motor for drive eject/auto insertion, chassis, and floppy sled/eject/insertion/ mechanism.
[IMPORTANT]Attempting to remove the read/write head from the drive mechanism chassis will ruin alignment and it is not possible to correct without special equipment.
The drive can fail to insert or eject floppies if the grease/lubricant on the tray and it's moving parts has become caked up with dust or hardened over time.
Old lubricant can be loosened up and removed using lighter fluid as a solvent, dripping it into the joints of moving parts being careful not to drip it inside onto the PCB and wiping away what can be reached. Tooth picks and cotton swabs can be used to clear out tight spaces.
Afterward, a lubricant like white lithium grease can be used to moving parts with a toothpick and a cotton swab, being careful not to get excess anywhere but where it is absolutely needed.
At the right rear of the drive is the Omron branded eject/insert motor and an assembly of gears related to it. This can fail if gears connected to it have cracked or the lubricant has hardened. If further disassembled, it can be cleaned out, and 3D printed replacement gears for this are available online for order. Teardown author has no affiliation with seller.
The screw gear which moves the read/write heads forward and backward can have its threads blocked by hardened lubricant. This can be cleaned up and relubricated much in the same way as the drive tray parts.
If the main PCB of the mechanism is to be removed for repair/recap it is important to make sure all connector headers and flex circuit cables are disconnected. It is important to be especially careful when disconnecting flex circuit cables for the read/write head as they can be easily cracked.
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