ZX Spectrum +3 - Cleaning and sound fix

... or just another story about mature hardware ;)

Intro

Yeah yeah, I know, I didn't write for quite a while. It was kinda hard due to prolonged holidays, job changing, online store opening - retro-cloud.eu and a damn mold in my garage ...
Anyway, I hope you'll enjoy this short story about Speccy +3

Background story

Some time ago a friend of mine bought a very cool machine - ZX Spectrum +3
He asked me to do some refurbishing work on it, prepare video cables for it and spot and fix potential issues.
I was like - Hell YEAH! I've never played with Speccy +3 before, so why not ?!

The machine

The machine itself has some bugs introduced in a manufacturing process. Same story as with Speccy +2. In general, a lot of speccy board revisions made by Amstrad has bugs and hardware issues. In this particular unit, I had a problem with "brooming" audio but first things first. Here is how this speccy looked like when it came to me :)




I didn't have an RGB cable yet so I had to run some preliminary test through RF cable - video output quality was defined by me as "crappolliooooiooio" :D

RGB Cable

I've started off with making a proper RGB cable to see if there are any issues with video output.
Unfortunately, I only had a DIN7 plug on a shelf and this particular Speccy needs a DIN8.
But hey! This is Retrohax! so things progressed quickly :D
The plan was to drill a center hole in DIN7 plug and insert a scavenged pin in it. Here is how I've done it.


A vise was quite handy while inserting a pin :)


Tadaaa ! DIN7 converted to DIN8 :D


Soldering followed shortly :)


This is supposed to be a DIN8->SCART cable so on the other end I've started to work on SCART plug.
To ease things up, I've joined all GND signals with a naked wire.


There are 3 resistors needed for RGB and another two for other signals so I've started adding 'em.


Next step was to about soldering all signal wires.



Outcome of above work can be seen below. I was more than happy with results.
Video quality was freaking awesome!

Mboard cleaning and mods

Next thing on a list was to clean up a motherboard and sort out any issues with it.
Here are some pics before I've put my hands on it. There were quite a few unusual mods.













The job

Usual work followed - cleaning, resocketing etc.

The case wasn't really tired so it only required simple cleaning. However, Keyboard was a bit dusty and I took care of it obviously :)




After a bit of work ...


After cleaning, board looked way better :D




Before ...


After ...


Floppy drive was a bit dusty too

There was only one last piece of the whole puzzle left - fixing a brooming audio. This problem and fix for it is described on many forums and websites so I won't go into details about it here. Instead, I'll put some pics and a comparison video.
Pics were shot right after soldering and I forgot to take photos of it after cleaning it so flux, my marking points, and other residue is present on these pics.



Below is a comparison video.

Thats it! :)


Drygol

Chaos is your redemption .... better run .... better hide

I come from Internetz :>