HP 7090A Measurement Plotter Test Plot

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My 7090A broke while I was working on the 83522A so I had to switch over to address it - The Geneva wheel had broken and the rubber pen caps in the carousel were sticking to the pens pretty badly. I posted about this on the EEVBlog - www.eevblog.com/forum/repair/...

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13 июн 2022

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Комментарии : 9

@PixelSchnitzel 2 года назад

I love to watch that. In my first job, I had the privilege of putting an IBM PC and a 7470A plotter to work. My boss had bought them and had no idea what to do with them. I was paid to tinker and develop whatever business applications I could imagine. Later, we got a 7550 plotter and things just continued from there into a fun career! What great memories this brings back!

@tgsoapbox 2 года назад

You have to love the plotter-y goodness of these things - The LCD display of this one is missing a few segments so in a future video I hope I can bring that back or I'll end up creating yet another project to live on my whiteboard list of projects to get to... Glad you enjoyed the video and it brought back some memories.

@PixelSchnitzel 2 года назад

@@tgsoapbox If it's a zebra strip making the contacts between the LCD and the PCB . . . well, I'm sure you're familiar with how to fix that!

@tgsoapbox 2 года назад

@@PixelSchnitzel I'm hoping that is all it is and not a problem with the custom LCD panel itself.

@tgsoapbox 2 года назад

I just took the LCD display out and it looks like the issue is with the zebra strips themselves and not with the LCD panel so finger crossed I can get it solved shortly

@CraigPetersen12f36b 2 года назад

I just read your post on the eevblog, interesting how you're having an issue with the pen caps sticking in the carousel. I have the HP 7475A and haven't had an issue, "yet". Nor have I had an issue with the pen caps on my 7470A's as well.

@tgsoapbox 2 года назад

I suspect that when they shelved the plotter, they left the pens in the carousel and they basically drained out - There was an unbelievable amount of ink that I washed out with IPA.

@CraigPetersen12f36b 2 года назад

@@tgsoapbox I just thought about that after I posted my comment. I was lucky, the 7475A I bought was used sparingly and kept in a $300+ armored instrument case. I did however buy a spare Geneva wheel, just in case.