Repairng Proprietary FDS Floppy Drive. Quick Disk drive
 

I need some tips on how to get a floppy drive working. It is in a nintedo
disk system it is similar to Quick Disk drives of 20 years ago. Someone else
already tried replacing the drive belt and it still didn't work. There is
also a speed adjustment. Does anyone have a service manual for one of these
floppys. I think the read head (single sided) may be out of alignment. I
know you can use a scope with a service manual to adjust a normal floppy
drive. Any ideas?

- Mike

On Fri, 7 Oct 2005 12:49:49 -0400, "Michael Kennedy"
put finger to keyboard and composed:

I need some tips on how to get a floppy drive working. It is in a nintedo
disk system it is similar to Quick Disk drives of 20 years ago. Someone else
already tried replacing the drive belt and it still didn't work. There is
also a speed adjustment. Does anyone have a service manual for one of these
floppys. I think the read head (single sided) may be out of alignment. I
know you can use a scope with a service manual to adjust a normal floppy
drive. Any ideas?

- Mike

I think it will be difficult, if not impractical, to attempt a head
alignment without an alignment diskette. As for adjusting the speed,
if you know the target RPM, and if it is a multiple of your mains
frequency, then it should be a simple matter to design a paper strobe
disc that you could attach to the drive motor and watch under a
fluorescent light.

-- Franc Zabkar

Please remove one 'i' from my address when replying by email.

"Franc Zabkar" wrote in message
...
On Fri, 7 Oct 2005 12:49:49 -0400, "Michael Kennedy"
put finger to keyboard and composed:

I need some tips on how to get a floppy drive working. It is in a nintedo
disk system it is similar to Quick Disk drives of 20 years ago. Someone
else
already tried replacing the drive belt and it still didn't work. There is
also a speed adjustment. Does anyone have a service manual for one of
these
floppys. I think the read head (single sided) may be out of alignment. I
know you can use a scope with a service manual to adjust a normal floppy
drive. Any ideas?

- Mike

I think it will be difficult, if not impractical, to attempt a head
alignment without an alignment diskette. As for adjusting the speed,
if you know the target RPM, and if it is a multiple of your mains
frequency, then it should be a simple matter to design a paper strobe
disc that you could attach to the drive motor and watch under a
fluorescent light.


Neon glow lamp works much better.

Sounds like a good idea, but I don't know where to start with the paper disk
idea. Sounds like what they used to have on the bottom of IBM 5.25 floppy
drives in the early 80's. Befor I was born but I have worked on about every
kind of pc from an 8086 up to today's stuff.

- Mike
"James Sweet" wrote in message
news:KgG1f.6063$Tn5.18@trnddc08...

"Franc Zabkar" wrote in message
...
On Fri, 7 Oct 2005 12:49:49 -0400, "Michael Kennedy"
put finger to keyboard and composed:

I need some tips on how to get a floppy drive working. It is in a
nintedo
disk system it is similar to Quick Disk drives of 20 years ago. Someone
else
already tried replacing the drive belt and it still didn't work. There
is
also a speed adjustment. Does anyone have a service manual for one of
these
floppys. I think the read head (single sided) may be out of alignment. I
know you can use a scope with a service manual to adjust a normal floppy
drive. Any ideas?

- Mike

I think it will be difficult, if not impractical, to attempt a head
alignment without an alignment diskette. As for adjusting the speed,
if you know the target RPM, and if it is a multiple of your mains
frequency, then it should be a simple matter to design a paper strobe
disc that you could attach to the drive motor and watch under a
fluorescent light.


Neon glow lamp works much better.

On Fri, 7 Oct 2005 22:47:10 -0400, "Michael Kennedy"
put finger to keyboard and composed:

Sounds like a good idea, but I don't know where to start with the paper disk
idea. Sounds like what they used to have on the bottom of IBM 5.25 floppy
drives in the early 80's. Befor I was born but I have worked on about every
kind of pc from an 8086 up to today's stuff.

Let's say the FDD spins at 300 RPM. That's 5 revs/sec. Assume mains
frequency is 60Hz. Make a paper disc with 24 sectors alternating black
and white. Assume that at time zero the strobe flash illuminates a
black sector. The next flash arrives 1/60 sec later, at which time the
motor will have rotated through 1/12 (=5/60) rev. This means that the
same image will now be under the strobe, making it appear stationary.

- Mike
"James Sweet" wrote in message
news:KgG1f.6063$Tn5.18@trnddc08...

"Franc Zabkar" wrote in message
...
On Fri, 7 Oct 2005 12:49:49 -0400, "Michael Kennedy"
put finger to keyboard and composed:

I need some tips on how to get a floppy drive working. It is in a
nintedo
disk system it is similar to Quick Disk drives of 20 years ago. Someone
else
already tried replacing the drive belt and it still didn't work. There
is
also a speed adjustment. Does anyone have a service manual for one of
these
floppys. I think the read head (single sided) may be out of alignment. I
know you can use a scope with a service manual to adjust a normal floppy
drive. Any ideas?

- Mike

I think it will be difficult, if not impractical, to attempt a head
alignment without an alignment diskette. As for adjusting the speed,
if you know the target RPM, and if it is a multiple of your mains
frequency, then it should be a simple matter to design a paper strobe
disc that you could attach to the drive motor and watch under a
fluorescent light.


Neon glow lamp works much better.





-- Franc Zabkar

Please remove one 'i' from my address when replying by email.

Repairng Proprietary FDS Floppy Drive. Quick Disk drive
 

"James Sweet" bravely wrote to "All" (08 Oct 05 02:36:26)
--- on the heady topic of " Repairng Proprietary FDS Floppy Drive. Quick
Disk drive"

JS From: "James Sweet"
JS Xref: core-easynews sci.electronics.repair:344432

JS "Franc Zabkar" wrote in message
JS ...

As for adjusting the speed,
if you know the target RPM, and if it is a multiple of your mains
frequency, then it should be a simple matter to design a paper strobe
disc that you could attach to the drive motor and watch under a
fluorescent light.


JS Neon glow lamp works much better.


A small panel light (#47 etc) with a rectifier diode in series is fine
too. Just take into account that the flicker rate will be 60Hz with
this but it will be 120Hz with the neon. I guess one could always put
a rectifier in series with the neon.

A*s*i*m*o*v

.... Electrical Engineers do it with more frequency and less resistance.