Amiga A500 Hitek keyboard issue

General hardware issues and troubleshooting etc

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weemidden
Posts: 2
Joined: 11 Jul 2023 12:50

Amiga A500 Hitek keyboard issue

Post by weemidden »

I have an Amiga A500 Hitek keyboard and when I first power on the Amiga and load something, lots of spaces run across the screen like the space bar is locked down (it isn't). As soon as I press any key, this stops and the keyboard works fine, including the space bar. If I power on the Amiga and press any key at the initial Workbench screen, I don't have any problems when I load something. It's almost like there's some kind of initialisation issue. The PCB looks good as do the connections. It's definitely a keyboard issue, as the same behaviour manifests in other A500s that I connect it up to.

Thanks in advance for any advice that you can proffer.
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GadgetUK164
Posts: 445
Joined: 04 Jan 2019 14:26

Re: Amiga A500 Hitek keyboard issue

Post by GadgetUK164 »

Add 2 x 22pF caps across the crystal resonator (each to ground)! I've got a video on this coming up!
ie. From the resonator (2 pins), connect a cap from 1 pin, to ground, do the same with the other pin and the other cap.
Converniently ground is right next to the clock IN and OUT pins on the 6570.
My YouTube Channel - www.youtube.com/GadgetUK164
weemidden
Posts: 2
Joined: 11 Jul 2023 12:50

Re: Amiga A500 Hitek keyboard issue

Post by weemidden »

Hi GadgetUK164

Thanks for the info on this, but I've now sold the keyboard (informing the buyer of the issue). I completely forgot that I had this post up, so I'll try and deactivate it if I can.

cheers

weemidden

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