Turbo-R Panasonic floppy drives

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Por Wolverine_nl

Paragon (1069)

Imagen del Wolverine_nl

28-03-2018, 09:21

I had the same issue with my GT floppy drive, seemed it wasn't the belt, but the head. It was out of alignment, that is really hard to fix. I have replaced the drive and it works now, but going to change it with a pc drive, without belts etc.

Por Moniz

Champion (352)

Imagen del Moniz

28-03-2018, 17:33

Is there a way to check if the alligment is off?
I tried to format a disk as a single sided disk but that didn't work, so maybe that had is misalligned?
If they are, how can they be adjusted? or will it be hopeless?

I'd really like to keep my GT as original as possible and I really like that distinct sound of a panasonic drive, but if its hopeless I guess I have to change the drive as well...

Por Edevaldo

Master (134)

Imagen del Edevaldo

29-03-2018, 01:23

When it is out of alignment you should be able to format a disk and read it back and write to it. It would just not be reliably read on other machines.

If you can't, the problem is either a more serious problem or the belt is causing the disk to slip and the driver cannot lock to the data coming out of the head.

Por Wolverine_nl

Paragon (1069)

Imagen del Wolverine_nl

29-03-2018, 09:19

The head alignment is indeed only when reading existing floppy disks.
Maybe still some dirt in it that causes the drive to not get to optimal running speed.

Por Moniz

Champion (352)

Imagen del Moniz

29-03-2018, 15:28

Both drives seem to be clean and not seem to have a problem getting up to speed. both drives start up straight away and seem consistant in speed (at least what i can notice).
The belt seems to be right.
I've also checked the ribboncable, its seems to be fine too, but I wasnt able to test the connections. Could it be that one signals is'nt received so that the GT thinks that there's no disk in the drive?

I will order some more belts and see if that is the problem afterall, because thats wath both drives have in common, I keep swapping the belt from one drive to the other.

Por Wolverine_nl

Paragon (1069)

Imagen del Wolverine_nl

29-03-2018, 15:53

Did you try and stretch one belt and then test it? Sturdy ones, even though they are meant for the drive, can also give some troubles. Or a spring that is failing, this can mean the disk is in the drive in a slightly wrong angle.

Por Moniz

Champion (352)

Imagen del Moniz

29-03-2018, 19:36

Just tried the stretching a well, I had the belt around a bottle for a little while. nut no luck either...
Im just wondering where the problem is now, both the drives or my msx..

Is there someone living in Friesland (or close by) and willing to test these drives in a panasonic 2+ or TR?

Por Josevil

Master (159)

Imagen del Josevil

30-03-2018, 17:35

tip: look at the second picture of the ad the original strap has 180 mm diameter (90 mm with a gauge) this measure is valid in a1f, a1fx wx and wsx a1 st and GT if you do not use the original strap make sure you meet this measure , the symptoms you describe cause them: an incorrect measurement or a broken fdd

長さ: 円周約180mm(写真2、伸ばさず2つ折りにて約90mm)

https://buyee.jp/item/yahoo/auction/h288277327

consejo : mira la segunda foto del anuncio la correa original tiene 180 mm de diametro (90 mm con un calibre ) esta medida es válida en en a1f ,a1fx wx y wsx a1 st y GT si no utilizas la correa original asegúrate que cumpla esta medida ,los síntomas que describes los ocasiona : una medida incorrecta o una disketera estropeada

Por Moniz

Champion (352)

Imagen del Moniz

30-03-2018, 21:37

@josevil, i measured the belt and it seems about right, its slightly longer but still the drive doesn''t seem to slip and start up straight away..
At the moment I can't really test anything because my TR is taking a bath (literly, well.. the case and buttons Tongue )

I still hope that someone is willing to test my drives to find out it they are still working or that the problem might be with the msx itself

Por Cageman

Supporter (10)

Imagen del Cageman

27-05-2018, 22:31

Hi All,

Reviving this thread a little, hoping it can help both myself and others.

I am having the exact same issues as described here, with the drive in a FS-A1 ST.

Some observations after quite a lot of fiddling and testing:

  1. Cleaned drive, replaced belt. Drive sounds normal, spins as it should.
  2. Reading disks gives a 'disk offline' error, trying to format the disk gives 'not ready'.
  3. I shorted the 'disk inserted' switch (so the drive always thinks there's a floppy inserted), and ran CALL FORMAT (with the drive empty; no disk inserted). It then says the floppy is write-protected.
  4. Pressing the write protect switch and re-running the format actually makes the drive start the formatting process. The drive just goes about formatting a floppy that's not there. Heads make a complete pass to the center of the spindle, return to 0, followed by a disk error, due to the fact the floppy cannot be read ofcourse.
  5. Then: returned everything to normal, inserted a floppy, ran CALL FORMAT. Same 'not ready' issue ofcourse.
  6. I then decided to lift the top head just a little (so it's off the disk), and start the format again. The drive then starts formatting the disk again, as if nothing is wrong.

Then I started to really experiment:

  1. I completely removed the top head from the drive, inserted a disk, and tried a format. Drive starts to format the disk again! And again, without a proper finish, as it cannot read the disk after the format operation.
  2. I re-installed the top head, and tried to align it to the bottom head as best as I could (by sight).
  3. After everything was put together, all issues returned. 'disk offline' while reading, 'not ready' when formatting.

Soo... not sure what to do next, but it seems that the problems start when the heads (or one of them) actually is touching the floppy. Nu clue why, or what to do. Thought I'd share what i have learned so far. I really would like to get this original drive to work, as many of us probably do.

Any thoughts?

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