General > General Technical Chat

Someone in 1988 had a boring job...

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james_s:

--- Quote from: pardo-bsso on October 17, 2022, 01:29:47 pm ---
--- Quote from: Alex Eisenhut on October 13, 2022, 12:02:05 am ---This thing's engineering is epic. The PCB even has grid coordinates silkscreened on it, A B C D 1 2 3 4,.

Nuts.

--- End quote ---

Actually that was very usual and is extremely helpful when you look at service manuals or schematics, you can quickly map where is each component/subsystem located.

--- End quote ---

Most of the older arcade games had that. It was practically essential when you had a PCB that was 12"x18" or larger.

Kasper:

--- Quote from: langwadt on October 15, 2022, 10:12:43 am ---
--- Quote from: TerraHertz on October 15, 2022, 07:03:54 am ---When you forgot to put a 'revision #' on the silkscreen, so you mark a pin as the rev #?

The idea 'insulate the pin from a screw' doesn't work, since there are two pins with identical spacing from the hole. And the screw/washer would contact the solder fillet anyway.

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if you look closely you can see that the other nearby pins are connected to the same ground plane as the mounting hole

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Could use a non-conductive washer to protect the fillet.

I used to do stuff like this in avionics right out of college.  It was boring but not as bad as you'd think.  I'd tinker, listen to music and chat with coworkers all day.  We'd build 10 to 30 radios at a time and they required a lot of mods and tuning so there was a fair bit of variety.  Some higher ups decided it was better to do lots of mods than to go through recertification required for an updated PCB.

Sometimes I put tubes over pins like this but it was on transistors, we'd rearange the pinout and use the tubes to stop the pins from shorting to eachother.  We'd also put kapton tape on PCB beside a ceramic cap and then solder 3 caps to it.

Our speed and QA failure rate had a small impact on our wage so that added a bit of entertainment as well.

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