Repair & Schematics
ZX Spectrum 128

Power Circuit (ZX Spectrum 128)

1min

The ZX Spectrum 128 gets three power rails directly from the external power supply.

There are no internal power regulators.

The power brick should supply +5V, +12V and -12V to the system.

ZX Spectrum +2A Power Supply
ZX Spectrum +2A Power Supply
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Start by checking with a multimeter that the power supply pins output those voltages, and when inserted it into the console, those voltages remain.

If the voltages drop once connected, check on the console for a short.

ZX Spectrum Power Supply Pinout
ZX Spectrum Power Supply Pinout
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