If you want to have a better reliable system, it will be better to have one of the newer boards.
Norberto
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The older DRAM boards can be quite problematic… ☹
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Great progress Mike!
Yes I’ve replaced the tinned connector pins on a number of backplanes. I used these parts from Phoenix Enterprises:
https://www.peconnectors.com/index.php?p=catalog&mode=search&search_str=hws3002
but obviously headers are available from many sources. Just make sure you’ve got the .318” height
the main difficulty is de-soldering the old connectors. If you’ve got the right de-soldering tools this goes pretty well. the other trick is when installing the new headers it is best to have a female connector of some sort inserted into the headers. This helps keep the pins straight and at a right angle to the board. I have a little jig I use for this purpose. You could probably just use an H8 board of some sort.
If you do this repair let us know how it goes or if you run into any problems… I do recommend it as the old tinned connectors will give you headaches (as you’ve discovered!).
I did not find it necessary to replace any of the female board edge connectors…
From: se...@googlegroups.com <se...@googlegroups.com> On Behalf Of Mike Ladwig
Sent: Friday, July 08, 2022 9:23 PM
To: SEBHC <se...@googlegroups.com>
Subject: Re: [sebhc] DG-32D memory board?
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Great work! I need to get for myself a Hakko FR-301, perhaps for X-MAS. Once you update to gold pins, the reliability of the system improves by a 100%. The H8 will work as it was designed for. I never got my original tin plated backplane to work reliable. I was never able to do anything as the system will hang at random. Once I updated to gold plated pins, the system never., never failed again.
Norberto
From: se...@googlegroups.com <se...@googlegroups.com>
On Behalf Of Peter Higgins
Sent: Friday, July 8, 2022 7:39 PM
To: SEBHC <se...@googlegroups.com>
Subject: Re: [sebhc] DG-32D memory board?
I replaced all the backplane connectors with gold-plated ones on one of my older H8s a couple of months ago. I have a powered-suction desoldering tool (the Hakko FR-301) which made the process fast and painless. Without such a tool the recommended (and far more painful) method is to pull each pin out individually from the front of the board as you heat the solder side of the pin on the back followed by a cleanup of each hole with flux and solder wick. See this comprehensive discussion on the topic:
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As a note, you can easily update the original H8 backplane with gold pins, as each hole is not plated thru. Solder is just on side 2 on each pad. The drawback is that when inserting a board, the pads on side 2 can be easily broken. The new golden pins will make it easier to insert with less force.
On the New backplane the holes are plated thru, so they cannot be removed once soldered in. Solder will be on side 1 and side2 of the board.
Norberto
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