View source for Keyboard Membrane Repair/Replacement Guide

[[Category:DIY]]
The CPC keyboards contain fragile keyboard membranes, which have a rather low lifetime of maybe 5-10 years.

The east-german CPC clone [[KC Compact]] and apparently at least [[:Image:Datamedia_sp64_2.jpg|early CPC 464s]] as well contain a more robust real keyboard circuit board, which should give it an infinite lifetime.

== Cleaning ==

Dual-foil membrane keyboards (as found in CPC 6128, CPC Plus, and 3rd generation CPC 464 keyboards) often only need to be cleaned.

== Repair ==

[[File:Leitsilber 3g.jpg|x60px|right]]
[[File:Leitsilber L100.jpg|x60px|right]]
Broken wires are most often occuring on single-foil keyboards (as found in CPC 664, and 2nd generation CPC 464 keyboards). There is no chance to repair broken wires on the membrane by soldering (either the wire vaporizes, or the foil melts). However, one can '''repaint''' broken wires using conductive silver, which is sold as:
* English: conductive silver (or conductive paint)
* German: Leitsilber (or Silber Leitlack)
* French: vernis conducteur / résine à l'argent / colle conductrice
* Spanish: ?
the silver should be available anywhere were you can buy electronic components. It may be also available as car equipment (for repairing the rear-window heating).
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== Replacement ==

=== New Membranes ===

New membranes are available for other home computers. But none are sold for CPCs...?

=== Adapters for PC Keyboards ===

The [[CPCKey]] circuit translates the serial PC Keyboard signals to CPC keyboard matrix signals (the circuit uses a lot of components though). A simplified solution may be a single chip with built-in microprocessor, flash memory, and I/O ports.

=== Rewired PC Keyboards ===

Cut all wires on the circuit board, and rewire them as in the CPCs keyboard matrix. Sounds simple, but it's quite a lot of work. Of course it works only with keyboards that do have a real circuit board, not with membrane based keyboards. Both expensive and inexpensive keyboards may contain either type.

== Pictures ==

<gallery>
File:CPC664 D-o-S membrane unrotated.jpg|CPC 664 (single-foil)
File:CPC6128 Keyboard membrane unrotated.jpg|CPC 6128 (dual-foil)
File:Nightfallcrew CPC Plus keyboard membrane.jpg|CPC Plus (dual-foil)
File:Kcc open.jpg|KC Compact with robust circuit board
</gallery>

== Weblinks ==

* http://amstrad.cpc.free.fr/article.php?sid=27 - How to fix the keyboard of your CPC (english)
* http://www.sellmyretro.com/ - Buy new keyboard membranes for CPC664 from RWAP software
* http://www.rwapsoftware.co.uk/ - RWAP Software, makers of membranes for Sinclair, Enterprise and CPC664
* http://www.tradeinpost.com/ - Buy new keyboard membranes for Amstrad 464/6128 Plus