Sinclair Spectrum

The famous ZX Spectrum from Sinclair Research introduced in 1982

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.

Spectrum motherboard Issue 2.
Note the reversed polarity on the silk screen for capacitor C46.

Spectrum motherboard Issue 2
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.

Spectrum motherboard Issue 3
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.