Is this a dying ferranti?
Re: Is this a dying ferranti?
They're the ones Lardo, not too vicious at removing gunk and especially good for cleaning ancient EPROM pins prior to programming them.
Re: Is this a dying ferranti?
I have one of those. It gets bits of fibreglass everywhere. And it's itchy!
All that I've learned - https://msknight.com/bbc/index.html#zx81
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Re: Is this a dying ferranti?
Thats the one! Works though.
ZX80
ZX81 iss 1 (bugged ROM, kludge fix, normal, rebuilt)
TS 1000 iss 3, ZXPand AY and +, ZX8-CCB, ZX-KDLX & ChromaSCART
Tatung 81 + Wespi
TS 1500 & 2000
Spectrum 16k (iss 1 s/n 862)
Spectrum 48ks plus a DIVMMC future and SPECTRA
ZX81 iss 1 (bugged ROM, kludge fix, normal, rebuilt)
TS 1000 iss 3, ZXPand AY and +, ZX8-CCB, ZX-KDLX & ChromaSCART
Tatung 81 + Wespi
TS 1500 & 2000
Spectrum 16k (iss 1 s/n 862)
Spectrum 48ks plus a DIVMMC future and SPECTRA
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- Joined: Mon Sep 26, 2011 10:56 am
- Location: Looking forward to summer in Somerset, UK...
Re: Is this a dying ferranti?
Yes, both the jack socket contacts and maybe the solder joints. And for the 7805, the solder joints. For all soldered connections, a bright light and a good quality magnifying glass. But if there's any old flux (brown deposits) clean first with IPA or a specific PCB flux cleaning solution. For any suspect joints, desolder. Clean the component/connector pin and then re-solder.
For the contacts, apply some IPA or contact cleaner to the contacts. Re-tension them by pushing down with a flat bladed screwdriver (with nothing in the socket).
Yes, the bits of fibreglass are annoying. Which is why I hold whatever I am cleaning over a bin.
The fibreglass "pencil' is good for cleaning chip legs/pins.
For the sockets, with the chip removed, again, examine under a bright light using a good quality magnifying glass. If you see any green, or any of the contacts look distorted or look different to other contacts, the entire socket should be replaced.
Otherwise, just clean each socket with a squirt from an aerosol can (using the plastic 'straw') of IPA or contact cleaner (but not the type that leaves an oil residue).
Mark
ZX81 Variations
ZX81 Chip Pin-outs
ZX81 Video Transistor Buffer Amp
Standby alert
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer later in the year.
ZX81 Chip Pin-outs
ZX81 Video Transistor Buffer Amp
Standby alert
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer later in the year.
Re: Is this a dying ferranti?
I went back and checked. They're getting on to the black side. Looks like that will be my first port of call once I've finished the new case for the first zeddy.
All that I've learned - https://msknight.com/bbc/index.html#zx81
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Re: Is this a dying ferranti?
The black is likely silver that has tarnished.
From elsewhere on the web (not me this time ):
From elsewhere on the web (not me this time ):
MarkWay back in the day, when I used to repair computers for a living, some chips pins would turn black over time. If they were soldered in place this was not a problem. But back then, many computer boards used sockets. This would cause connection problems. The thing is only certain manufacturers chips would turn black. Usually TI chips were the worst. The thing is that TI used to (maybe still do?) silver plate their pins. The black build up was silver tarnish. Just like your mom's good silver. What we used to do was to take the chips and dip them in a silver cleaner, then dip them in rubbing alcohol, then in hot water. Then we would let them dry. The alcohol would remove any residue from teh silver cleaner. The water would remove the alcohol. The parts would come out nice and shiny and work for several years after that.
ZX81 Variations
ZX81 Chip Pin-outs
ZX81 Video Transistor Buffer Amp
Standby alert
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer later in the year.
ZX81 Chip Pin-outs
ZX81 Video Transistor Buffer Amp
Standby alert
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer later in the year.
Re: Is this a dying ferranti?
Ah! Great. I'll de-socket the chip and take it to "Flog It." Should get a fiver at least.
All that I've learned - https://msknight.com/bbc/index.html#zx81