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Did you measure the voltages at the floppy port? Should be 5 and 12 volt. Did you clean and reseat the ROM?

I dry my washed boards in an oven at 50-60°C for half an hour.

Here you can find some images for the bluescsi with OS, which should work: https://www.savagetaylor.com/downloads/downloads-macintosh/

https://68kmla.org/bb/index.php?threads/bother-with-recapping-floppy-drives.43876/

I do not know, if it helps, but in this thread (last post) there is another adapter (for one 27C010): https://forum.vcfed.org/index.php?threads/macintosh-se-broken-rom-low-chip.60566/ There are two 4.7kOhm Resistors used to connect the 5V to VPP, PGM and OE. I think that this is used in the...

Here someone described a zero track alignment procedure that worked for him. https://tinkerdifferent.com/threads/superdrive-floppy-maintenance.549/page-2 I have the same problems with some drives. So I am interested if you have a solution for your problem.

The dead mac scrolls: Page 46-48 https://cdn.hackaday.io/files/1681007191990400/The_Dead_Mac_Scrolls_1992-1.pdf

Could be a cracked solder joint. https://macgui.com/news/article.php?t=515 Or L2, C1 https://www.jagshouse.com/vertical.html

You should recap the AB and the PSU too. The caps leak and damage the boards.

A SD card can be used as a scsi drive for example with: - SCSI2SD - MACSD - BlueSCSI - ZuluSCSI - RaSCSI, now PiSCSI Or you build your own TashTwenty (emulates a HD20 at the floppy port). https://68kmla.org/bb/index.php?threads/tashtwenty-single-chip-dcd-hard-disk-20-interface.39357/

Perhaps you should buy a floppy emu with the software SD. It is an easy way to transfer software to the mac. https://www.bigmessowires.com/floppy-emu/

You should recap the Logic board (LB). The caps leak and may damage the LB. And remove the battery. The analog board and the power supply could also need a recap. The voltages are ok so far as the computer tries to boot. But you can check them at the floppy port. Should be 5 and 12 Volt. For...

Did you measure the voltages? Perhaps they are lower at the 5010? Is the AB recapped?

I am interested in a fully assembled unit (+ shipping to germany).

Printer cable: https://whitefiles.org/tec/pgs/h10b. Third cable: http://www.applefool.com/se30/images/img/1yq5cpr6.png Networking https://www.jagshouse.com/filesharing.html I would solder my own cable to connect two macs.

There are a lot of parts on classic AB that can be defect. Most often: DP3 and DP4 (1N4148), TDA4605, CNY17G, IRFBC40.

And an instruction for burning ROMs (mac plus): https://www.instructables.com/Create-Macintosh-Plus-ROMs/

If you want to burn new ROMs, then you can use 27C256 or 27C512 Eproms: https://forums.macrumors.com/threads/mac-512k-error-code-014120.1539356/

https://68kmla.org/bb/index.php?threads/macintosh-classic-compatible-eprom.36462/