Panasonic JA751 8" drive question

[Chuck Guzis]

On 31 Oct 2009 at 21:03, Steven Hirsch wrote:

> - The unit has a 7812 (12V) 3-terminal regulator hung off what would
> normally be the +12V line of the molex connector for, e.g. a 5.25"
> floppy drive.  That input goes through a 100ohm 5W resistor before
> hitting the regulator.  With 12V applied the drive, I see only 9.2V at
> the input to the regulator and approx. 7V on the other side.  Sure
> _looks_ like maybe it's supposed to see +24V at the top of that
> resistor, doesn't it?

This drive sounds a *lot* like the Tandon 848, which also uses a 7812 
to drop the +24 to +12.  There's also an on-board jumper around the 
7812 that allows the drive to work on +12 instead of +24.

There's a schematic in the TM848 product spec on bitsavers.

--Chuck