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Repair guide

Replace a dead ZX Spectrum keyboard membrane

Spectrum-family keyboards use a flat membrane with printed tracks that crack and wear. Replacing it is a short job that often cures dead keys.

Open the interactive checklist Tick off each step as you go. It saves in your browser.

Keyboard · Easy · about 30 minutes. Try it, but check first. This will not fix every machine, so read the sources first.

You are in the right place if: Some keys do nothing, or whole rows or columns of keys are dead.

Before you start

  • Handle ribbon connectors gently; they tear easily.
  • Unplug before opening.

Board revisions and models

Membranes differ between the 48K rubber-key, Spectrum+, 128K and the +2 and +3.

Parts you may need

  • Replacement membrane for your Spectrum model. Match your model Amazon · eBay
  • Isopropyl alcohol. Clean connectors Amazon · eBay

Tools

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Step by step

  1. Disconnect power Unplug the Spectrum and take any peripherals off.
  2. Open the case Remove the screws on the underside and lift the case carefully.
  3. Release the old membrane Unplug the membrane's ribbon connectors from the board.
  4. Inspect the old membrane Look for cracks or worn tracks.
  5. Check the connector Clean the board connector with isopropyl alcohol if it looks dirty.
  6. Fit the new membrane Slide in the new membrane, taking care to line up the tails with the connector.
  7. Test before closing Power on and test the keys before reassembling fully.
  8. Close the case Put the case back together and test again.

Tips, tales and maybes

Found in write-ups and forum threads. These are other people's reports, not tested by us.

  • Maybe (Low confidence). Test with a keyboard tester program before closing the case. General technique, no source.

Sources

We wrote this one from general technique and have no source to credit for it yet. Treat it as a starting point, and read or watch a guide for your exact model before you begin.

Boards and models vary, so check what is in front of you. A repair can involve hot tools, chemicals and, on some machines, dangerous voltages. You do it at your own risk.

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