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I use this one: https://www.thingiverse.com/thing:4499563 Can be printed with a 3D-printer.

Measuring the voltages at the floppy port. 5V should be 4.85 or higher.

Did you change the TDA4605?

I would change the diodes (DP3, DP4) and TDA4605, CNY17G, IRFBC40. I used CNY17G-3, but do not know, if -2 will work.

Can be printed with a 3D-printer: https://www.thingiverse.com/thing:4499563

My plus can boot of a scsi2sd! I posted in this Thread (Page 3): https://68kmla.org/bb/index.php?threads/fitting-a-scsi2sd-in-a-68k-mac.3742/page-3 Here are some news for SCSI2SD and Mac Plus: I used the description of MOS8_030. The vendor etc. were Seagate and ST225N. Device Size: 8 GB; HD SC...

A lot of things can be wrong with Classic analog boards (the two Diodes DP3 and DP4 (1N4148) are almost bad everytime, TDA4605, CNY17G, IRFBC40).

5V should be 4.85 to 5.15. 12V can be up to 12.8 V. Look at both when turning and measure again after a few minutes! Sometimes it is useful to turn pp1 from one end to the other before you turn on the classic.

You can read the rom with an eprom programmer and compare them to roms donwloaded from macintoshrepository. Where do you live?

Did you turn pp1 and check the voltage when turning?

ROMs are here: https://www.macintoshrepository.org/7038-all-macintosh-roms-68k-ppc- Those files must be splitted into even and odd bytes. My software (Windows) for splitting and comparing ROMs is attached.

AFAIK the plus ROMS will fit into the 512k board. Perhaps you can use them for a test.

ROMs can be burned into 27512 Eproms. You can download 512 Roms https://www.instructables.com/Create-Macintosh-Plus-ROMs/ https://www.macintoshrepository.org/7038-all-macintosh-roms-68k-ppc-

Rebooting can be caused by bad caps on the AB or the power supply. Recap both! Check the voltages at the floppy port. Must be 5 and 12 V. The disk drive must be cleaned and greased.

I posted in this Thread (Page 3): https://68kmla.org/bb/index.php?threads/fitting-a-scsi2sd-in-a-68k-mac.3742/page-3 Here are some news for SCSI2SD and Mac Plus: I used the description of MOS8_030. The vendor etc. were Seagate and ST225N. Device Size: 8 GB; HD SC Setup formated 20 MB. OS 6.0.8...

Perhaps it may be better to use a BlueSCSI?

Could be a defect Q2 (BU 406). Did you check the voltages at the floppy port? Should be 5 and 12 V.

What happens if you just use an empty field at Domain? What if you just use a dot (.)?

Use paperclips to check the voltages at the floppy port. Here you can see the pinout. https://forums.macrumors.com/threads/macintosh-128k-voltage-setting.2036734/

Wow! Nice restoration!