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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: ckillerh3 on July 01, 2005, 04:17:21 AM

Title: Help with A2K Dead Floppy Drives
Post by: ckillerh3 on July 01, 2005, 04:17:21 AM

Howdy -

I removed the motherboard from my A2K to remove an old battery.  Anyway, when I got it back together only one of the dual floppys wanted to work.  After fiddling around with it, swapping the CIA chips, as well as the J301 jumper neither one wants to work.  

Next I re-seated all the other custom socketed chips on the Mother Board.  

Any ideas what gremlin got into my machine?

Thanks,

Floppy-less in NJ

Title: Re: Help with A2K Dead Floppy Drives
Post by: melott on July 01, 2005, 04:49:04 AM

Ok... maybe a dumb question.......
Did you replace the floppies the same as they were....
(did you remove them from the mount bridge ?)
and is the ribbon cable back on the same way you removed
it ? Also check to see if you only plugged the cable
onto just the bottom set of pins (I've done that :-D
totally missed the top set of pins)
 

Title: Re: Help with A2K Dead Floppy Drives
Post by: Darklight on July 01, 2005, 05:02:45 AM

Yep, I'd agree with melott - when I put mine together recently, it took me several times to get it working properly, because the cable kept coming out at the back of the drives, see if that's what's causing it.

Title: Re: Help with A2K Dead Floppy Drives
Post by: ckillerh3 on July 01, 2005, 12:18:18 PM

Thanks for the posts.

I checked and double checked the ribbon cables a number of times.  I'm beginning to think the actual cable itself is bad and am going to take a volt meter to it.

One time on the mother board I put the cable on only one row of pins.  That did not work very well !  The cable is "keyed" at the floppy end so those fit nicely.

At this point the old girl is dead in the water !   How sad : (

Title: Re: Help with A2K Dead Floppy Drives
Post by: patrik on July 01, 2005, 01:02:55 PM

@ckillerh:

The J301-jumper must be closed for DF1: to be recognized. Other than that, you havent changed locations of the floppys on the cable, I mean: are the floppys connected to the same connector on the cable as they used too? In my A2000 DF0: is connected at the end-connector of the cable(with the cable-twist just before it) and DF1: is connected to the middle-connector.

Both drives are chinon drives - the same model.nr printed on them (FB-354), but they don't look identical. DF0: has 3x2 jumpers while DF1: only has 3x1 jumpers. To make a qualified guess - only the bottom row is important as that is the row that is jumpered on both drives. If you look from the back of the drives - DF0: has the middle and right pins connected jumpered and DF1: has the middle and the left pins jumpered. Can someone confirm this or shed some light on the jumpering?


/Patrik

Title: Problem Solved - Help with A2K Dead Floppy Drives
Post by: ckillerh3 on July 01, 2005, 10:59:33 PM

You are most likely correct !   The face plate of DF1 was broken so
I substituted anoter drive from another Amiga 2000 carcas I had
around the house.  I did not think to check any settings on the
drives themselves.  I just assumed they were interchangeable.
I will snoop this out and see if that solves the problem. You,
sir, get the Sherlock Holmes award !

Stephen

Title: Re: Problem Solved - Help with A2K Dead Floppy Drives
Post by: orange on July 01, 2005, 11:58:25 PM

are those jumper positions the same in A4000 FDDs? I have turned off df0: and jumpered df1 as df0 but forgot how df1 has been (and want to get back)

Title: Re: Problem Solved - Help with A2K Dead Floppy Drives
Post by: Amiga4k on July 04, 2005, 04:24:12 AM

Orange,
I looked in my spare drive boxes. Looking at the jumper block from the rear. The jumper pins were:

DF0: middle and right pins.
DF1: middle and the left pins.