HP 82901M 5.25in 270K FDD

This is a floppy drive for HP systems with an HP-IB interface to allow them to read LIF formatted 5.25" floppy floppy disks. Internally they use standard full height 5.25" internal drives like a Tandon TM100-2A.

Causes

 * These capacitors will likely not be bad, but may have degraded from disuse. They can short if powered without caution.

Solutions

 * Before powering the device, remove caps (which doesn't even require soldering) and Reform them both.

Disassembly Notes
The logic board for the entire unit is attached through the controller board for the right side drive and may have damaged plastic mounting points on the drive. They are not structurally critical to the operation of the device, but do secure the drive control board in place.

Power Supply
82901-60001 ''Note: Sprague PSU caps should have a Capacitor Reforming procedure attempted on them before powering or replacement. Suitable substitute parts are difficult and costly to find so unnecessary replacement is higly discouraged.''

Related Links

 * More general device info: https://wiki.techtangents.net/wiki/HP_82901M_5.25in_270K_FDD
 * Documentation and other info: http://www.hpmuseum.net/display_item.php?hw=287