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zx spectrum +2A symbol lock always on

Posted: Sat Jan 19, 2019 6:17 am
by landex
Hi
I have zx spectrum +2A, for years, last time I play with, it was every thing fine.
Today I tested it, and the symbol lock is always on.
What could be the issue?

Regards

Re: zx spectrum +2A symbol lock always on

Posted: Sat Jan 19, 2019 8:37 am
by Ast A. Moore
Any number of things: the keyboard membrane, one or of the diodes D6–D22 (more specifically, D14–D22), or the gate array itself. The most likely culprit, however, is the keyboard membrane, or even some dust/dirt underneath the CAPS LOCK key. (I assume you mean that key, rather than the two SYMBOL SHIFT keys on either side of the keyboard.)

Try carefully disassembling the keyboard and cleaning it. See that clears the fault.

Re: zx spectrum +2A symbol lock always on

Posted: Sat Jan 19, 2019 2:59 pm
by landex
Thanks Ast, II wiil try it.
When I press the keys they return.

Re: zx spectrum +2A symbol lock always on

Posted: Sat Jan 19, 2019 3:36 pm
by Ast A. Moore
landex wrote: Sat Jan 19, 2019 2:59 pm When I press the keys they return.
This doesn’t mean that the membrane underneath the mechanical key is not damaged or dirty, though. You need to disassemble the Spectrum, then further take apart the keyboard assembly, and carefully inspect the membrane for dirt or damage.

Re: zx spectrum +2A symbol lock always on

Posted: Sun Jan 20, 2019 8:54 am
by landex
Thank you guys, i took the two keys from above, clean them, and now it works fine! :D
Under it its very clean, I thing it was little plastic under one key.