Sinclair ZX Spectrum 48k Repair part 2, NebULA ULA Replacement Install and Test

Part 2 of our Speccy Refurb Video,

We install and Test the NebULA replacement from Retroleum,

To recap, in the previous video:

I got hold of a beat up boxed 48K ZX Spectrum that was in need of some love.

It had a very common fault, a failed keyboard membrane, notoriously bad and made out of some plastic that was designed to fail.

The case was missing the upper keyboard cover with all the functions written on it and the keyboard was generally warn out and faded.

We also recap the whole thing replacing all the 37 year old capacitors with nice new ones.

Fit a switching 5v power regulator to replace the inefficient LM7805 style one, so we could remove the massive heat sink.

Replacing the composite video transistors with modern ones for a brighter picture and fitting a decoupling capacitor to the video output.

We then replace the membrane with a new 2016 manufactured replacement.

After which we find a fault with the ULA chip and that means we need another replacement part.

Shout out to @zx_wife https://twitter.com/zx_wife

AWESOME!

Membrane:

http://r.ebay.com/IijvSy

Capacitor and Video Mod Kit:

http://r.ebay.com/frxEBS

General Speccy parts shop

http://www.zxrenew.co.uk

5v 1.5a Regulator (any will do really)

https://uk.rs-online.com/web/p/switching-regulators/7962132/

Simple ZX Spectrum Video mod

http://www.retrogamescollector.com/simple-zx-spectrum-composite-mod/

NebULA modern replacement ULA

http://blog.retroleum.co.uk/electronics-articles/nebula-spectrum-ula-chip-replacement-module/

Forum post explaining stuck ULA

https://spectrumcomputing.co.uk/forums/viewtopic.php?t=452

Music:
Hello There

Josh Penn-Pierson https://www.youtube.com/watch?v=CvYqnmbDCpI

License: [CC-BY] (Creative Commons Attribution 4.0 International)

http://pennpierson.com

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