Soldering a mainboard can become a frustrating and horrible task if some tips are not performed and the results might even leed up to a
nonfunctional mainboard. If the mainboard is not assembled in a professional factory with wavesoldering bath then there are several
problems to handle in the most important one is that you would need a few hands more than you can offer.
But there is a simple solution : working with the "Sandwich" - method.
the assembly is split to several different stages - depending to the "hight" of the components....
in general a Mimeo boards for example will be split to the following groups / steps:
3) filter capacitors and ceramic capacitors
4) small electrolytic capacitors and crystal
7 ) voltage ICīs and connectors
8) finally the big electrolytic capacitors and the volatgeregulator with the cooling sink
First of all you will need to get a peice of stabile plywood with about 4 mm or 5 mm thickness and the size should be only little bit larger than
the Mimeo mainboard itself ( there should be a border of 1 cm more at each side of the mainboard ). That board should be very stiff !
You should not be able to bend it ! This plywood board should then be covered completely at one side with a rather hard ( only little flexibel )
foam that is not to weak against heat ( no styrofoam !) by fixing it to the wood with sheets of doubleside- adhesive tape.
In the first step all resistors are inserted in the board and then the plywood board is placed on the top above the resistors and then that plywood board is
fixed with large and strong rubber rings like shown in the drawing below.
When the "Sandwich" is complete and
the rubber rings are strong enough, then you can flip that
entire "package" around and start to solder the resistors.
The rubber rings should be positioned
like displayed in the picture above to make sure that the
pressure of the rings is supplied equaly to the entire surface
After all sockets have been fixed at 2
points you may remove the rubber rings and the plywoodboard.
Then you should heat again the soldering joints
At Applefritter the member
PhilPower mentioned correctly that nobody will be able to
reproduce perfectly the solderingside of an Apple 1 and this
is the best statement to be
due to european laws
and german court decision:
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