Amiga 4000 weird floppy device behavior

[reflex]

hello, yesterday i turned my amiga 4000 on and noticed that the floppy led stays always on, inserting a floppy gives no result, nothing is detected by AmigaOS.
i tried to check in early startup sequence and i gets on the devices connected 4 floppies named DF0, DF1, DF2, DF3 even though i just have 1 floppy drive connected to the internal interface.
Computer never had any acid leakage from the battery but has both PIO2 and 112MB hacks.

Every explanation/suggestion is welcome

[nogginthenog]

The floppy led staying on could mean that the floppy cable connected the wrong way. Done any maintenance recently? The A4000 connector is not keyed so it's easy to do.

[chiark]

It could also mean it's the right way up, but shifted across by a column of pins. I had exactly this yesterday in my 3000.
Seeing four drives on the early startup is definitely odd though...

[reflex]

i made some maintenance e but the floppy was OK as far as i remember, seeing 4 drives is really odd indeed.... so i guesses some other kind of conflicts

[Kin Hell]

Originally Posted by reflex

i made some maintenance e but the floppy was OK as far as i remember, seeing 4 drives is really odd indeed.... so i guesses some other kind of conflicts

Hopefully, you have the original Chinon HD FLoppy fitted & this has just started to happen at random? - IE, you haven't had it to bits & re-fitted the cable incorrectly.

Just inside the front edge of the floppy drive, there are two micro switches.
One left & one right. - These drop into the holes on your Floppy Disks & denote either Writeable, write protected or HD. - Looking at the front of the Floppy Drive, the HD switch is to the right....

These switches get sticky & don't make contact after a while & will cause irregular Floppy drive chirps, drive light flashes & even DF0/1:?? errors on the workbench desktop.

Clean the switches with Air first, blow through a straw if you have to, ...but please don't dribble.

Flush switches with Isopropyl after de-dusting & make sure the rear of the drive is higher than the floppy slot/switch side so no fluid runs back into the drives mechanism.

If this doesn't work, then your HD Chinon has lost it's magic smoke & will need further investigation.

Good luck fella.

[Jope]

If all floppies are detected, then the ready signal is shorted to ground.

Potential easy things to rule out:
- Are the floppy cables all properly aligned on the pin headers on both ends?
-> check and fix
- The floppy cable might have separated inside and signal wires are shorting to adjacent ground wires.
-> try booting the machine with the floppy cable detached from the motherboard, see whether the ghost drives go away