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I once replaced a blown Q4 on an SuperDrive with diodes I got from AliExpress. The drive works to this day. https://68kmla.org/bb/index.php?threads/blown-component-on-sony-mp-f75w.44807/#post-515317

I got myself another Mac Plus and an additional logic board for a decent price. The machine is in good condition but does not work. The AB has battery damage inside the battery compartment and for whatever reason on the Optocoupler IC. I reflowed (nearly) every joint and tried powering it on...

Yes, such a black box was also inside the machine.

Update: I found this in the Internet Archive: https://web.archive.org/web/20100615035229/http://myoldmac.net/SELL/Apple-Card-GSP-Tablet-Interface.htm So this card isn´t an serial card as I thought. It´s an interface card for a graphics tablet. Case closed.

Thanks. I found this thread while searching. Unfortunately the user with such a card was last online 15 years ago and the Internet Archive did not catch the picture URL he posted. :-(

In my recently purchased Apple IIe there was an serial card but which lacks two ICs. Unfortunately I was not able to identify the card and subsequently I could not check which ICs where originally installed on this card. Does anyone recognize this card? I searched the internet but to no avail.

No harm done other that the arm was modified. But this arm was broken as I got it. If sometime in the future 3D parts for this appear the drive can drive can be repaired with it.

Yes its an stock 400k drive.

Success. It took me several days to build up a sufficient structure onto the arm. Now an inserted disk touches it and pressing it down into the light barrier which in itself activates the motor to turn the disc. Mission completed. :)

Yes there seems to be missing something on my drive. I watched @JDW s video on recapping those drives and on you can see how it is supposed to look. I took apart the drive and try to build up structure on the part that slides betweeen the photo sensor. I´ll put drops of epoxy over the next fews...

No, my does also have a photo diode which gets blocked when the plastic thingy (see https://68kmla.org/bb/index.php?threads/400k-floppy-drive-looking-for-3d-printer-file.48527/) is being pressed down by the floppy disk.

My 512k is slowly taking shape. I previously repaired its 400k drive and make it insert and eject disks properly. I removed the dried grease and reapplied new one. Also as my drive lost its upper head pressure pad I made a new one from a paper based cotton bud. Now that I have a working machine...

I did it. Those tabs are in fact controlling both directions. 😀

I know those two tabs but in my experience those only control the horizontal position of the picture.

The picture I get is It is shifted upwards. I can regulate it with the height adjustment pot, but this only streches the picture.

I'm doing small incremental steps towards a functional 512k. I replaced R56 and R57 with new pots (2.5M ohm ones; 2M ohm were not available). Now the dimming of the whole picture does not happen anymore. I also replaced the LM324 on U1 as I thought it fixes the upwards shifted picture. I read...

There where no unsoldered pins when I received the machine. I took the photos while repairing it. Yes those pots R56+57 where probably affected by the leaky battery. R56 (brightness) is working again after cleaning but a little bit scratchy, R57 (focus, according to AB cover sheet) is still stuck.

It took me a while to replace the diodes in question. After that the machine bongs and I had a picture. But within minutes the brightness degraded up to a point where I could barely see the floppy icon. The brightness adjust knob worked while this happened. I think that machine is cursed in some...

The BOM of the Analog Board replica (https://github.com/daanvdl/Macintosh-Analogboard) lists a 4N35 as a correct part.

I tried a second time with another CRT/coil. It sparks again but now I spotted the area. It the diodes CR9, CR10 and especially CR11. Measuring CR11 i have throughput in both directions. As a diode it should be conducting only in one direction. I have to source a replacement and lets cross...