Floppy Drive Light staying On

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Newton's Cat
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Floppy Drive Light staying On

Postby Newton's Cat » Mon Sep 27, 2004 11:19 pm

Hi Folks

I've just acquired a box of STFMs and am having great fun with them.

One has a problem. Its an old TOS 1.02, 360kb floppy model. The onboard drive light and the keyboard drive light stays on when the drive has stopped. The drive works ok, but when it stops and the light goes off, it then spends a few seconds returning to full glow again. The drive stays stopped. The problem is that the external floppy drive most times can't be accessed. The external light comes on - but the internal drive operates. A message that the B drive is not accessible appears (occasionally the B drive does operate). Disconnecting the internal drive still leaves the keyboard drive light on - and the external drive inaccessible.

The board has a RAM upgrade. A card on top of the MMU chip, a memory card, and a Video Shifter chip. I removed the MMU card and memory card, just leaving the Video Shifter chip in place. The system boots ok - but the floppy problem is still the same.

Dud board? (I can't see any obvious damage to the board)

Just out of intellectual interest - does anyone know what the problem might be?

The Cat

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exxos
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Postby exxos » Tue Sep 28, 2004 10:25 am

ive seen that ST, though if I remember right its one of those massive floppy drives with belts on the bottom ? if so the drive is probably long gone, theres normally a floppy controller board (instead of the ribbon cable) which also tend to go faulty. You should be able to replace it with a normal 720K drive and floppy cable.

Removing the RAM upgrade if its been plugged over the MMU and SHIFTER, might not be a good idea, most of those RAM upgrades pushed pins between the MMU and socket, which bends the pins, resulting in poor contact if the board was removed.

HTH.
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