I thought maybe it would be best to create this "Part 2" so the sub-topic of DuoDisk would be easier to find and maybe someone in the future would be helped by following my progress with each part of the //e resurrection.
Part 1 - The Power Supply is here: https://www.applefritter.com/content/resurrecting-apple-e.It started to divert a little from just the power supply (with some pretty good tips and advice about dirty disks), and some other folks discovered the same capacitor fix I did (again with great help from the folks here) so it's still a good read for that.
Now for Part 2 - The DuoDisk Drives.A quick re-cap: After replacing the RIFA capacitors, the computer booted up fine and stayed on without incident. However, the DuoDisk doesn't work. I took everyone's advice on cleaning heads and disks, and checking the speed, but nothing is happening. When the computer comes on, it beeps, shows the Apple //e title, but the drive just spind until I do CONTROL-RESET. Then it goes into BASIC. I can write and run BASIC programs.I had the DuoDisk apart for cleaning so looked closer and saw that it does spin and the head moves just a little bit but won't go to the "home" position. I can slide it along the rails freely so there's no binding. I switched the drives - putting the #2 in the first position and vice versa. Then the one in the first position does same thing except that head does go "home".Now the new info:A friend of my son brought over a couple of boxes of stuff he thought I might could use. It's remnants of a system he used in his office then gave to his son many years ago. Not everything survived the years and teenage curiosity but there's some useful stuff here: 2 Apple 2c power supplies, 2 Laser 128 computers, 1 Apple 9" green-screen display, and 1 Apple 5.25" disk drive.After cleaning the heads and insides of the single Apple drive, I connected it to my controller card and Bingo! The //e boots and the drive, saves, retrieves and purrs like a kitten. By using substitution and elimination I was able to troubleshoot (and I think I found the trouble with) the DuoDisk.
To make it easier to follow, I'll call the #1 drive of the DuoDisk the Green drive and #2 the Red drive. The single drive will be Blue. When I swapped the mechanical portion of the Blue drive with the mechanical portion of Green, using the DuoDrives analog board, Blue acted the same way Green did - no head movement, only motor spinning. When I put the mechanical portion of Green in the case of the single drive, using that analog board, it worked normally. And when I put the mechanical portion of the Red drive in the case of the single drive, using that analog board, it worked normally also. So I figure the problem has to be the DuoDisk's analog board.
Do you folks think I'm on the right track here? I pulled and reseated all the ICs on the board but that didn't make a difference. Could it be one or more bad ICs? And which ones could be bad? I made a list of them I can post if needed and I tried to find where I could order them online. Some are hard to find, and some I'm not sure if the numbers I found online are legitimate substitutes. I welcome all advice on this.
Mr. Timelord, I believe this is where you were going with your line of thinking. I would appreciate reading your thoughts on my conclusion.Thank you one and all,