New Acorn Atom Issue 5 owner

discussion of games, software, hardware & emulators relating to the Acorn Atom
msch
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New Acorn Atom Issue 5 owner

Postby msch » Thu Mar 30, 2017 10:09 am

Hi all,

I am a new member (collecting british micros of the 80's) and I hope somebody can help. I picked up the Atom yesterday (ebay, sold as a probably defective item, without power supply, with composite wire) and before I power on I want to perform a pre-check.

The previous owner wrote that I need a power supply with 8V. But when I look at the pcb I am shure he is wrong. Here are the Pics:

Acorn_Atom.jpeg
The Beauty

Atom_PCB_Issue5.jpeg
PCB Issue 5

Atom_Power_Regulator.jpeg
LK6 and LK7 wired!


Am I right that I need a 5V mains (2A, polarity center positive?)?

I think the previous owner connected 8V so I think he destroyed some components. What do You guys recommend - how should I start?

Thanks in advance!

Best regards

Mathias

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Multiwizard
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Re: New Acorn Atom Issue 5 owner

Postby Multiwizard » Thu Mar 30, 2017 10:15 am

Yes you are right, LINK 6 and 7 are made...


Greetings, Wim... :-)

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DutchAcorn
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Re: New Acorn Atom Issue 5 owner

Postby DutchAcorn » Thu Mar 30, 2017 10:54 am

msch wrote:... I think the previous owner connected 8V so I think he destroyed some components. What do You guys recommend - how should I start? ...

Make a quick prayer and power it up (yes, 5V!). :D

It looks very nice and clean btw.
Paul

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roland
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Re: New Acorn Atom Issue 5 owner

Postby roland » Thu Mar 30, 2017 11:12 am

Just power it up with 5V. And remember, as long as the main board is of good quality we can get this Atom working. All parts are quite easy to get on this forum or on Ebay.

Good luck and have fun with your Atom!
256K + 6502 Inside
MAN WOMAN :shock:

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sirmorris
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Re: New Acorn Atom Issue 5 owner

Postby sirmorris » Thu Mar 30, 2017 1:58 pm

PL8 appears to be mounted on the wrong side of the board. It should have pins on the keyboard side. This is a problem as any connections to it will be reversed. I can build your AtoMMC adjusted to compensate, but you must bear this in mind when potentially attaching other devices...

msch
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Re: New Acorn Atom Issue 5 owner

Postby msch » Thu Mar 30, 2017 3:57 pm

Thanks all for now.

I will inspect PL8 (I will provide better fotos) and if wrong I will correct it if possible - no need to rework the AtoMMC.

msch
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Re: New Acorn Atom Issue 5 owner

Postby msch » Thu Mar 30, 2017 4:11 pm

here are the new pics:

regulators.jpeg
regulator solder points

pl8pins.jpeg
pl8 solder site

pl8wrongorientation.jpeg
pl8 sockets


it seems that the previous owner soldered/changed the regulators and LK6 is NOT soldered!
Last edited by msch on Thu Mar 30, 2017 4:18 pm, edited 1 time in total.

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jms2
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Re: New Acorn Atom Issue 5 owner

Postby jms2 » Thu Mar 30, 2017 4:17 pm

That's a very nice machine! :D Congratulations.

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roland
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Re: New Acorn Atom Issue 5 owner

Postby roland » Thu Mar 30, 2017 4:35 pm

Removing PL8 is easy. I did this also once. You can simply cut the connector, clean the holes and mount a new one on the other site. Takes about 30 minutes.

See also viewtopic.php?f=44&t=7099&hilit=PL8&start=30#p72774
256K + 6502 Inside
MAN WOMAN :shock:

msch
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Re: New Acorn Atom Issue 5 owner

Postby msch » Thu Mar 30, 2017 6:15 pm

Thank You Roland - but I want to use the original white one. I will desolder it carefully and mount it on the right side :wink:

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Multiwizard
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Re: New Acorn Atom Issue 5 owner

Postby Multiwizard » Thu Mar 30, 2017 6:54 pm

msch wrote:I will desolder it carefully and mount it on the right side :wink:
It's doable, I did it several times... :D


Greetings, Wim... :-)

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sirmorris
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Re: New Acorn Atom Issue 5 owner

Postby sirmorris » Thu Mar 30, 2017 8:06 pm

Please be very very careful though, the Atom's motherboards are now old and I find the tracks lift more readily than other boards I work on*

Like I said, I can correct for the placement by building AtoMMC differently. By all means go ahead to do the work, but don't feel you have to just yet.


* which reminds me - I should really service my thermic lance.

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Multiwizard
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Re: New Acorn Atom Issue 5 owner

Postby Multiwizard » Thu Mar 30, 2017 8:16 pm

What Charlie said, be very careful...

Heat it up a bit till you can wiggle one of the pins with a little needle nose pliers, then you can carefully pull it out one by one.

In my case, I first removed (also very carefully) the white casing before I removed those pins... :mrgreen:


Greetings, Wim... :-)

msch
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Re: New Acorn Atom Issue 5 owner

Postby msch » Thu Mar 30, 2017 8:40 pm

I will do it carefully - removing the white case first is a good idea :-)

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Multiwizard
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Re: New Acorn Atom Issue 5 owner

Postby Multiwizard » Thu Mar 30, 2017 9:43 pm

msch wrote:I will do it carefully - removing the white case first is a good idea :-)
After removing all the pins you put them back into the white case...

Like this...


Greetings, Wim... :-)
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