Refurbing an issue one zeddy

[amigaman07]

On another Note, and I may get "STONED" for this too...

My Original ZX81 UK 700 Power Supply DIED the Death!

When I opened it up, all the Caps & Resistors Pass the Tests!

I think it is actually the "TRANSFORMER" that Died (Big Black thing with Lots of Copper Wires Wrapped around it)

(Anyone know where I can get another???)

I thought about De-Soldering the Lead and attaching it to a ZX Spectrum 48k UK 1400 Power Supply, but then I would need another ZX Spectrum PSU!

Sooo, I am currently using... Dare I say it?...

An ATARI 2600 WOODY Power Supply!

It err, Does Work!

Darren in OZ

[Lardo Boffin]

"cosmetically too poor to sell on with good conscience"

Looks in Better Condition than My Timex 1000 !

Whats this about "HEAT SINKs"???



Darren in OZ

It's the case that's a bit beat up. The keyboard works but has loads of dents.

Don't mention heat sinks!!!!!!

[Lardo Boffin]

On another Note, and I may get "STONED" for this too...

Sooo, I am currently using... Dare I say it?...

An ATARI 2600 WOODY Power Supply!

It err, Does Work!

Darren in OZ

I say this with the greatest affection for Sinclair stuff (I have a lot of it) but improvisation was very much the name of the game with Sir Clive and his team! What you are doing is very much in character with the zeddy!

[sirmorris]

Get a modern regulated supply of something like 7.5-8 volts. The regulator will run cooler and your zeddy will thank you.

[amigaman07]

Hi Lardo Boffin.

RE: "The keyboard works but has loads of dents."

The Owner of this Site can supply you with a Cheap New REPRODUCTION Keyboard, Better than the Original!

And is Cheap as Chips!

Darren

[1024MAK]

My Original ZX81 UK 700 Power Supply DIED the Death!
<snip>
I think it is actually the "TRANSFORMER" that Died (Big Black thing with Lots of Copper Wires Wrapped around

Far more likely that the thermal fuse (mounted either between the transformer and the PCB, or under the tape that covers the primary winding, the fuse is on the top layer of the winding) has gone open circuit.

If you are careful, sometimes it is possible to replace these with new ones. If you do, note that you have to use a heat shunt otherwise you risk blowing it with the heat from the soldering iron

Mark

[Lardo Boffin]

Hi Lardo Boffin.

RE: "The keyboard works but has loads of dents."

The Owner of this Site can supply you with a Cheap New REPRODUCTION Keyboard, Better than the Original!

And is Cheap as Chips!

Darren

Thanks! I have bought a few of these but when the keyboard works perfectly I don't really like to change it.

[povvercrazy]

On another Note, and I may get "STONED" for this too...

Sooo, I am currently using... Dare I say it?...

An ATARI 2600 WOODY Power Supply!

It err, Does Work!

Darren in OZ

I do have a tip, don't be half asleep and too eager to test your newly refurbished woody 2600
that you use a megadrive power supply .......the nice big 2200uf cap go boom boom

[amigaman07]

Ha ha,

I was going to say...

I use a "Megadrive 1" Power Supply on my ZX Spectrum 48k and my Commodore 16, WHOOPS... can I mention the "C" Word on this site?

Darren

[Lardo Boffin]

As the modern switching regulators run cool, it's okay if they touch the case. As long as the case fits without stress on the parts.

Mark

A Tracopower TSR1-2450 is slightly too large to fit. Once in place there is a very slight bend on the motherboard which I figure is not ideal. So - back to soldering onto the legs of the previous incumbent...

Mark - your solution with the new wire wrapped around the end looks neat. What type of wire is it?

Also did the ROMs arrive ok?

Thanks

Lardo