Sinclair ZX80 / ZX81 / Z88 Forums

Plug on the printer.

Socket on the power supply.

Same plug size as zeddy power pack and obviously corresponding socket.

Make sure wires well separated/insulated from each other as it is a tight fit in side the plug/socket and do connect together before powering up as even 20 odd volts ac can do a bit of damage if briefly shorted out plugging the plug into the socket when powered up.


Edit.

Just noticed your power pack looks to be 28.8 volts at 1 amp ,the original is 24 volts at 1.2 amps couldn't say if that's crucial or not but obviously a replacement judging by the look of it.

Thanks Moggy!

I will see if I can get hold of a properly rated PSU. Not sure the extra 4V will cause damage but would rather not risk it.

A typical voltage resistance of capacitors (inside the printer) is 35V. This value fits to a rectivied AC voltage of 24V, but not to more (the capacitor may explode).

Siggi

Moggy wrote: ↑Mon May 31, 2021 12:08 am Same plug size as zeddy power pack and obviously corresponding socket.

No, Zeddy uses 3,5 mm plugs, the printer 2,5 mm plugs.

Thanks all. Even if 28V doesn’t cause damage I don’t trust one that has been taped together.

So I have until Xmas to sort a new PSU then - all this will be used for is printing the inside of retro xmas cards!

siggi wrote: ↑Mon May 31, 2021 9:54 am

Moggy wrote: ↑Mon May 31, 2021 12:08 am Same plug size as zeddy power pack and obviously corresponding socket.

No, Zeddy uses 3,5 mm plugs, the printer 2,5 mm plugs.

Must have been the Venusian loobdingle translation matrix I was using, sorry.


@Lardo.

And don't forget to put the tenner inside my card this year, you forgot last time.

Moggy wrote: ↑Mon May 31, 2021 1:19 pm

siggi wrote: ↑Mon May 31, 2021 9:54 am

Moggy wrote: ↑Mon May 31, 2021 12:08 am Same plug size as zeddy power pack and obviously corresponding socket.

No, Zeddy uses 3,5 mm plugs, the printer 2,5 mm plugs.

Must have been the Venusian loobdingle translation matrix I was using, sorry.


@Lardo.

And don't forget to put the tenner inside my card this year, you forgot last time.

I’ll print one but not sure you will be able to spend it…

I recently bought an Alphacom 32 with no PSU so I'm about to search for one. Does anyone know if its 24V peak to peak, or 24V RMS? Better still, can anyone recommend a reliable replacement available in Germany? Thank you.

The PSU supplied with my brand new Alphacom 32 is same as image here

A few years ago I measured output as 30V AC (RMS) offload, dropping to 27.7V at 0.87A when the printer was chugging away.

Thanks, thats useful to know. Ill see if I can find something similar.