[battwell]

I have an old biesse machine which use rt480 controller with floopy drive model ju-257a688pc. Recently I have problems using this drive.
I saw your message regarding instruction how to mount a new drive.
can you explain how to install a new pc floopy drive to the macine ?

Thanks,

Shlomo[/QUOTE]
you do this at your own risk. it worked for me. mine just wouldnt boot properly.

you have to completely remove controller from cabinet. open rear of cabinet with power off!
mark all cable positions of plugs and make a drawing of where they go... 6 plugs i think. remove all plugs and 4 front screws. controller can be pulled out from the front.

take top off controller box. unscrew drive holder from side. unscrew drive from holder.
replace with new drive.
if you take a drive from a pc note the position of the red wire on power plug as it needs to be plugged in the right way round. the tape plug has a keyway so it goes one way.

the drive must be configured to cn0 not cn1 as is standard on a pc... the original had jumpers but the newer ones usually have solder pads which are visible through holes on underside.
desolder the pad which is solered as cn1 and cut through the centre.
solder accross the joint of cn0 to bridge it as cn1 was.

the drive is then configured for cno instead of cn1.

now reassemble in reverse order.
i put controller in loose with floppy hanging out of door loose also to test. when happy i reassembled everything as was originally.

hope that helps

[battwell]

i opened the original floppy drive today that wouldnt read disks.
the motor has an open worm drive on it. the original grease had gone very hard blocking the worm drive stopping it moving freely. i used a small craft knife to pick it clean then a cotton wool bud with wd40 on it. a small vaseline smear to finish and it now works perfectly again.
well worth checking as it only took a few minutes to do.


i also have the biesse original drive numbers and models here with correct jumper configuration.