General Category > Amstrad CPC hardware

Help, I changed the drive-belt and now my disk drive is suddenly read-only?

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Bryce:
This is probably one of the most frequently asked questions here in the forum, so I thought I'd make a short guide to address it...

Chances are, you've lost the write-pin while you were changing the belt. It's a small metal pin that senses the position of the write-protection tab on the inserted disk and if it's missing all disks will seem to be write-protected to the computer. But before you go crawling around aimlessly on that patterned carpet, here's what you are actually looking for:


Pin.JPG
(126.39 kB, 1024x768 - viewed 464 times)

Yes, it's small. If you do find it, this is where it needs to go. It simply drops into the hole. If no disc is inserted at the time, it should go all the way in until the head is lying against the aluminium frame:


PinPos.JPG
(222.06 kB, 1024x768 - viewed 619 times)

However, this might not be your problem. There are several versions of the Amstrad 3in drive and not all of them used a physical pin, some used optical sensors. So how do you tell if your drive had a pin in the first place?
If your drives PCB has a black sensor like this one:


Optical1.JPG
(188.02 kB, 1024x768 - viewed 634 times)

Or a plexiglass sensor like this one:


Optical2.JPG
(149.32 kB, 1024x768 - viewed 613 times)

Then stop crawling around on your hands and knees like an idiot, your drive never had a pin, so you haven't lost it.

If however, your PCB has switch contacts that look like this:


PinSwitch.JPG
(154.34 kB, 1024x768 - viewed 604 times)

Then keep looking, you really have lost it. If you still can't find it, then your only option is to make a new one. This is what you'll need to make:


Writepin.png
(10.17 kB, 960x720 - viewed 601 times)[/attach][/attach]

Gryzor:
Great guide!  Love the detail you went into, right down to the diagram. But why not in the wiki?

Bryce:
I was a bit worried about uploading anything to the Wiki at the moment, due to the issues with the updates. If the Wiki is deemed stable again, I'll copy the whole thing over tonight.

Bryce.

Gryzor:
The wiki is never unstable. When it's down, it's down for good. That's what the updates were there for anyhow :D

But yes, I understand. It's release-level again.

Bryce:
Transferred to the wiki. It can be found here (the article, not that pin that you've lost!): Writepin - CPCWiki

Bryce.

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