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"A recap/update: It now successfully formats, verifies and mounts 800k disks (two-sided) in one shot (without having to format one side first). It appears to format 1.44mb disks but immediately fails/ejects on verification with every disk I've tried (about a dozen) that work fine in other...

Have you serviced the drive? Looks like sticky old grease causing it not to go in and then once that is done you need to realign the track zero.

Yes track zero alignment will be the problem. Loosen the screw holding the motor just enough to get some rotational movement and then rotate the motor Really small amount in one direction test and if no go try the other direction. I've done a number of these and sometimes you get it straight...

Hi Picked up a 300 cheap but it seems to be dead no power led when 12v applied. Anybody know anything about fault finding these? Thanks

Has the board been recapped?

Have you checked every pin connection on the replaced memory chips and sounded them with multimeter?

Is the floppy drive you are working on the problem? It may be the cause of the Blown UJ11. Have you another computer you can test the floppy drives on?

This is probably a very good candidate for a reloaded board. Caymac?

+1 for Caymac Will knows them backards

Have you checked the voltages on the board? played with the pot that adjusts voltages? Cleaned the actual male pins and female sockets of all the connectors to the digital board?

Anyone have a copy Castlewood ORB SCSI MAC 2.2gb Installtion Suite cd (1999)

Thanks for the Manual Scan. Yes PC drive is 360k only

Found these rough copies of manual

Cheers for that

Thanks for the resources folks

Great job. Where did you source your replacement fan? Cheers

Nice

Have you tried a known working drive in the IIfx? Do you get same problem? Oh I should read above posts you have done this so its a board issue. Another SWIM to be sure

Voltage is too low, should be around 5v, check your two boards in the working 128k. Have a look at the circuit of analogue board and look for faulty components or joints around the voltage adjustment potentiometer.

You really should upgrade the ROMS it will solve your problems