HP 9121D

HP dual floppy drive with Sony OA-D31V-14 model floppy drives.

Causes

 * Magnetic hall sensors failsure
 * Test by removing motor assembly, directly powering, and nudge motor to start spinning

Solutions

 * Replace hall THS103A sensors

Causes

 * Bent flat when reassembled and crushed by screw post

Solutions

 * Replace diode

Disassembly Notes
Diode D10 next to one of the screw holes on logic board is very easily pinched when reassembling and may be cracked. Be sure to bend it upright before putting PCB back onto chassis

Main Logic Board
FC-6

Basic PCB Name
If parts are not available or different selection is preferred, you can use the values in the Original Parts section to perform a parametric searc

Related Links

 * More Information: https://wiki.techtangents.net/wiki/HP-9121D_3.5%22_Double_Density_Single_Sided_Floppy_Drive