SC100 board

[Nicholas Stock]

Does anyone on the list have a decent copy of the original Forbes SC100 scope clock board they could share? Trying to troubleshoot a board that was working but is now no longer doing so.

Thx,

Nick

[GEK]

Nicholas -

Looking for a picture of the board, or the manual/schematic?

My clock failed a few years ago, turned out one of the PCB traces oxidized and failed.  It was a trace near the edge of the board.

- Gary

[Nicholas Stock]

Hi Gary, that's an interesting observation...may I ask which trace failed?

Best,

Nick

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[David]

Nick,

There are several revisions of this board. 

SC100A was split down the middle.

SC100C was a simple rectangle, single sided copper.

SC100E was double sided copper with vias.

I have artwork, schematics and maybe a blank board of each.

I can supply photos of assembled boards.

David Forbes, Tucson AZ

On May 20, 2026, at 9:46 AM, Nicholas Stock <nick...@gmail.com> wrote:



Does anyone on the list have a decent copy of the original Forbes SC100 scope clock board they could share? Trying to troubleshoot a board that was working but is now no longer doing so.

Thx,

Nick

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[GEK]

I don't recall where the break was, but it was a bear to troubleshoot.  The clock is the SC100C version.

I'm sure it was a random failure - the clock has been one of my favorites for years now (Thanks David!!).

- Gary

[gregebert]

Nick - What specifically has gone awry with your scope clock ? While I dont have an original, I suspect the 2-board kit I purchased a few years ago stole the design from David Forbes.