ZX Spectrum repair
repair of these types
It is worth mentioning which types we are sure to repair.
These types are the following:
ZX Spectrum 16k, 48k
ZX Spectrum +
ZX Spectrum 128k
ZX Spectrum 128k +2, +2A, +2B, +3, +3B
Sinclair QL
ZX 80/81
Timex Sinclair 1000
Tape recorders for ZX Spectrum
ZX Spectrum external memory expander
ZX Spectrum power-supply
manifacturing accessories, making modifications
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Converting ZX 80, 81, Spectrum 16k, 48k, + RF output to video signal (Video MOD).
The conversion can easily be restored to the original state if you want to do so later.
good to know
During repair/restoration, basic service for all devices (if not already done):
- replacing (axial/radial) electrolytic capacitor (Re-Cap) with a shape-correct version
- chemical washing of PCB, casing and keyboard
- neutralizing leaked electrolytic liquid on PCB, removing resin stains (even after repair)
- microscopic checking parts and solderings, replacement and repair as needed
- replacing loose, damaged IC parts and rusty, rotten parts
- cleaning contacts
- heat pasting heatsink
- in case of drivers: cleaning, replacing (axial/radial) electrolytic capacitor (Re-Cap) with a shape-correct version, oiling, replacing belt, reseting head (with fixing)
- checking current consumption on PCB
- running DiagROM, 30 minute software testing
- Converting RF output to Composite signal
- replacing keyboard membrane (with a tested type)
- replacing rubber feet (color- and shape-correct)
In case of power-supplies:
- loadability test
- Replacing ZX Spectrum 16K, 48K, + filter capacitor and Graetz bridge (they cannot handle 60-80% of load during loadability test)
- Replacing ZX Spectrum 128k, +2, +2A, +2B, +3, +3B, QL (axial/radial) electrolyte capacitor (Re-Cap) with a shape-correct version (axial/radial)
- replacing damaged terminals (230V AC, and low voltage)
ZX Spectrum 16k, 48k and + Video MOD
ZX81 and Timex Video MOD
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