Floppy Drives don't work

Retrofan · 08 January 2013, 12:13

Hi:
This is with my A1200 2B mobo. I thought it was the floppy drive, but I've tried a couple and all make the same. This last drive I'm trying is second hand, but tried by the seller.

When inserting a floppy it moves spinning but the arm that has to move over it doesn't, so it always shows me the floppy as DF0??? and trying to format it, it tells I/O-Error 21, Error Initializing!

I've tried cleaning and also a drop of oil, but that's not the problem.

hooverphonique · 08 January 2013, 13:12

sounds like one of your cia's are fried (I don't remember which one is responsible for the stepping signal)..

Retrofan · 08 January 2013, 14:38

That's what I think. I would like to know what to change from a broken mobo.

demolition · 08 January 2013, 14:42

I would first try using another drive and cable. If the problem persists, I would inspect the PCB to see if there's any broken tracks around the CIA chips and floppy header. Replacing the CIA chips isn't trivial and requires the right equipment as well as some knowledge as to how its used.

cpiac64 · 08 January 2013, 15:44

change the drive first

Retrofan · 08 January 2013, 20:27

I've changed drive and cables, as the latest came with them. Next is look the pcb. I'm not scared of changing CIA chips; I've done some in the past.

Anyway I will try a 3rd drive.

Which is the responsible chip?

cpiac64 · 08 January 2013, 21:16

check 12 and 5 volt, verify if exist a resistor like fuse (on a500 exist r401 and r408 4,7ohm)

hooverphonique · 08 January 2013, 22:44

just had a gander at the schematics.. The cia in question is U8 and the stepping signal is on pin 12..

FOL · 08 January 2013, 22:52

Quote:

Originally Posted by cpiac64

check 12 and 5 volt, verify if exist a resistor like fuse (on a500 exist r401 and r408 4,7ohm)

I to would check this, as I had a board before where someone had been connected it wrong, it sucked up so much current the track burnt off of the board.
I repaired track and it all worked fine. This was effecting the 5v rail only, 12v rail was fine so drive would try and do something.

If there is no damage to the supply lines, then I would agree on CIA being an issue.

Retrofan · 08 January 2013, 23:20

Upps!

Thanks for your advices! Yes, I changed a floppy drive that didn't work, I bought a second hand one that doesn't work... but now I try a 3rd one and it works.

So, no CIA chips, no fault, just the drive... I hate this. My no-working ones are the original Chinon ones. This working is an adapted Panasonic, that BTW makes no noise at all .

Well, thanks for your help

08 January 2013, 12:13	#1
Retrofan Ruler of the Universe Join Date: Mar 2010 Location: Lanzarote/Spain Posts: 6,185	Floppy Drives don't work Hi: This is with my A1200 2B mobo. I thought it was the floppy drive, but I've tried a couple and all make the same. This last drive I'm trying is second hand, but tried by the seller. When inserting a floppy it moves spinning but the arm that has to move over it doesn't, so it always shows me the floppy as DF0??? and trying to format it, it tells I/O-Error 21, Error Initializing! I've tried cleaning and also a drop of oil, but that's not the problem.

08 January 2013, 22:44	#8
hooverphonique ex. demoscener "Bigmama" Join Date: Jun 2012 Location: Fyn / Denmark Posts: 1,624	just had a gander at the schematics.. The cia in question is U8 and the stepping signal is on pin 12.. Last edited by hooverphonique; 08 January 2013 at 23:05.

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08 January 2013, 13:12	#2
hooverphonique ex. demoscener "Bigmama" Join Date: Jun 2012 Location: Fyn / Denmark Posts: 1,624	sounds like one of your cia's are fried (I don't remember which one is responsible for the stepping signal)..

08 January 2013, 14:38	#3
Retrofan Ruler of the Universe Join Date: Mar 2010 Location: Lanzarote/Spain Posts: 6,185	That's what I think. I would like to know what to change from a broken mobo.

08 January 2013, 14:42	#4
demolition Unregistered User Join Date: Sep 2012 Location: Copenhagen / DK Age: 43 Posts: 4,190	I would first try using another drive and cable. If the problem persists, I would inspect the PCB to see if there's any broken tracks around the CIA chips and floppy header. Replacing the CIA chips isn't trivial and requires the right equipment as well as some knowledge as to how its used.

08 January 2013, 15:44	#5
cpiac64 Registered User Join Date: Apr 2010 Location: Italy Posts: 1,136	change the drive first

08 January 2013, 20:27	#6
Retrofan Ruler of the Universe Join Date: Mar 2010 Location: Lanzarote/Spain Posts: 6,185	I've changed drive and cables, as the latest came with them. Next is look the pcb. I'm not scared of changing CIA chips; I've done some in the past. Anyway I will try a 3rd drive. Which is the responsible chip?

08 January 2013, 21:16	#7
cpiac64 Registered User Join Date: Apr 2010 Location: Italy Posts: 1,136	check 12 and 5 volt, verify if exist a resistor like fuse (on a500 exist r401 and r408 4,7ohm)

08 January 2013, 23:20	#10
Retrofan Ruler of the Universe Join Date: Mar 2010 Location: Lanzarote/Spain Posts: 6,185	Upps! Thanks for your advices! Yes, I changed a floppy drive that didn't work, I bought a second hand one that doesn't work... but now I try a 3rd one and it works. So, no CIA chips, no fault, just the drive... I hate this. My no-working ones are the original Chinon ones. This working is an adapted Panasonic, that BTW makes no noise at all . Well, thanks for your help

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