Sinclair Spectrum

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Revision as of 11:41, 24 February 2022 by Timbo614 (talk | contribs) (Add Issue 3 Caps list)
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The famous ZX Spectrum from Sinclair Research introduced in 1982


For more information, see this article's corresponding Wikipedia page: ZX Spectrum.
Sinclair Spectrum
Preliminary Information
Release Year 1982
Leak Risk Medium
Batteries None
Mounting Technology Through Hole, Sockets
Capacitor Types Aluminum Electrolytic, Ceramic, Polymer
Destructive Entry No

Known Issues

Symptom or Problem Encountered

Causes

  • Description of cause

Solutions

  • Solution to the problem

Disassembly Notes

A Spectrum 48K is easy to disassemble:

Remove the five screws from the back. Carefully open the case then lift the front edge you will see the keyboard connections to the motherboard, ease these connections out because they are easily damaged. Note that if the Keyboard is the original it is likely to be non-functional.

Original Parts

Spectrum motherboard Issue 2.

Picture of Sinclair Spectrum issue 2 motherboard showing capacitor positions and values
Sinclair Spectrum issue 2 motherboard capacitors

Note the reversed polarity on the silk screen for capacitor C46.

Capacitor Specifications and Footprint Information
Qty Capacitance Voltage Mount Diameter/Size Height Temp Type Brand Series
C25,C28,C44,C47,C50,C65 6 22 µF 16 V Axial 4.8 mm Dia. 12 mm 85 °C Aluminum Electrolytic Gelec
C27,C46 2 1 µF 50 V Axial 4.8 mm Dia. 12 mm 85 °C Aluminum Electrolytic Gelec
C44,C45 2 100 µF 16 V Axial 6.5 mm Dia. 16 mm 85 °C Aluminum Electrolytic Gelec

Replacement Parts

Spectrum motherboard Issue 2

Replacement Radial Capacitors
RefDes Qty Compatible Part Number Order Links
C25, C28, C44, C47, C50, C65 6 860020372002 Digikey Mouser
C27, C46 2 860020672005 DigiKey Mouser
C44, C45 2 860010372006 DigiKey Mouser

If parts are not available or different selection is preferred, you can use the values in the Original Parts section to perform a parametric search.

Original Parts

Spectrum motherboard Issue 3

Picture of Sinclair Spectrum issue 2 motherboard showing capacitor positions and values
Sinclair Spectrum issue 3 motherboard capacitors
Capacitor Specifications and Footprint Information
RefDes Qty Capacitance Voltage Mount Diameter/Size Height Temp Type Brand Series
C25,C28,C34,C47,C50,C65 6 22 µF 25 Axial 4.8mm 12 mm 85 °C Aluminum Electrolytic Philips
C27,C46 2 1 µF 50 V Axial 4.8 mm Dia. 12 mm 85 °C Aluminum Electrolytic Gelec
C44,C45 2 100 µF 16 V Axial 6.5 mm Dia. 16 mm 85 °C Aluminum Electrolytic Gelec
C74 1 4.7 µF 50 V Axial 4.8 mm Dia. 12 mm 85 °C Aluminum Electrolytic Philips

Replacement Parts

Spectrum motherboard Issue 3

Capacitors
RefDes Qty Compatible Part Number Order Links
Digikey

If parts are not available or different selection is preferred, you can use the values in the Original Parts section to perform a parametric search.

References