RE: [N8VEM-S100:6323] 8" floppy disk drives

Thanks, Josh. Yes, shorted tantalum caps are both common and spectacular. My problems with these, however, have subsided considerably since replacing my old linear boat-anchor power supply with a switcher – a MeanWell QP-200F, same as I put into my new computer. The regulator pass-transistor in the old PS had a habit of shorting on a regular basis, putting nearly 40V out to the disk drives. I had enough after the 5^th or 6^th repair job to the PS and, usually to the disk drives too. I have also replaced the LED half of the index sensor on several. The old ones were infrared, but I found a bright-white LED worked satisfactory too – and now I can tell if it stops working. I have started having door latch problems as the plastic gets old and brittle, and I think I have a bad head on one drive. I have cannibalized one of the drives to keep the others working. I have a complete set of technical literature, including schematics, so I will be able to keep these running, theoretically, indefinitely as long as I can find parts or non-functional parts donors. Now with two computers in need of floppy drives, I need to get more. Are you interested in selling your two?

Bob Bell

From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On Behalf Of Crusty OMO
Sent: Monday, February 16, 2015 1:56 AM
To: n8vem...@googlegroups.com
Subject: RE: [N8VEM-S100:6323] 8" floppy disk drives - looking for some

Hi Bob,

I have 2 of these drives that came with my IMSAI. They were not working, but weren't hard to fix. I drew up a schematic for them, you might be able to find it by searching the web. What I really want to say, was there wasn't much wrong with them. The tantalum capacitors were shorted, Photo slot switches were not working, I found decent replacements at Digi-Key... I'll try to find the right part number.

Cheers,
Josh

Date: Sun, 15 Feb 2015 13:46:49 -0800
From: bbel...@gmail.com
To: n8vem...@googlegroups.com
Subject: [N8VEM-S100:6322] 8" floppy disk drives - looking for some

Hello most wise S-100 group:

I have completed the backplane (N8VEM version 2) and power portions of my new S-100 computer (I'll post some photos when I get a chance...) and now I am searching for 8" floppy disk drives for it. My original S-100 (from the late '70s, and still working) is standardized on the Siemens FDD100-8 using a CCS 2422 Controller. I have several of these drives, some not working, and was interested in using the same model drive in this new machines for the sake of consistency and because I have complete owner and service manuals for these drives. My question to the group:

Does any one know of a source for these drives, or does anyone have any of these drives, working or not, that they would be interested in selling?
I had acquired several of the units I have from Ebay, but I have not seen any on there for several years now.

Thanks for your help!

Bob Bell

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