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Did you check the voltages of the repaired board? 5 V should be between 4.85 and 5.15V.

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

https://68kmla.org/bb/index.php?threads/introducing-tiny-transfer-a-simple-binhex-archiving-and-serial-transfer-tool.47508/

I would take the roms out and clean the pins. Then reseat them. Sometimes this helps to solve rom problems.

A Zip 100 will work without the diode, a bluescsi not, because it has no seperate power suply.

If it chimes, then the ROM may be ok. Did you turn the brightness knob (under the apple logo)?

Error 01 means a ROM error. The ROMs of pluses can be defect. You can burn new ROMs with an eprom burner or you can buy them on ebay. There are a lot of people in this forum that can burn new ROMs. Leaking caps can cause defect chips but you have to open the case to have a look inside. Did the...

Perhaps a stupid question: Are you sure that you have a 1.4MB floppy drive? I own an SE/30 that had a 800KB drive, because it was an upgraded SE. What color has the cable of the drive? Grey/red or grey/yellow? What is the type number of the drive? Did you clean the reading head of the floppy...

You do not have to buy new ROMs. You can test the ROMs by reading and comparing them with a burner with ROMs you can download from the net. https://macintoshgarden.org/apps/macintosh-rom-archive The plus had three versions of ROMs.

Burning a ROM: https://www.instructables.com/Create-Macintosh-Plus-ROMs/ https://68kmla.org/bb/index.php?threads/macintosh-plus-repair-help.37296/

Did you try to clean and reseat RAM and ROM? Sometimes Plus ROMs are defect and you have to burn new ones.

@demik Which Macrecorder did you build? Macrecorder or Macrecorder II? The Macrecorder II uses the TLC549 ADC. There is a schematic in the fall 1985 BMUG Newsletter.

This pinout may help: https://old.pinouts.ru/PortableDevices/iomega_zip_cd_pinout.shtml

You do not have to open the classic to measure the voltages. You can do it at the floppy port. The only things you need are a voltmeter and a little paperclip.

Did you measure the voltages at the floppy port? There are a lot of parts on classic AB that can be defect. Most often: DP3 and DP4 (1N4148), TDA4605, CNY17G, IRFBC40. Could be that you have to replace some of these. Recapping AB and LB should be done. Take the battery out of th LB.

You could try to program the 1704 with a pickit3 with this software: http://kair.us/projects/pickitminus/ It worked for me.

I would measure the voltages at the floppy port. You need 4.85 V to boot a mac.

This could be helpful:

Thank you for all your feedback! First I tried pickitminus with my Pickit 3 and that worked! I could program the 1704. The only problem is, that only some of my SD-cards could be used with the the sparkfun sd board. I knew about that problem, but had a little hope, that the 1704 could solve it...

Can anybody describe how you did the programming of a 1704. With MPLAB 8.92 it does not work, with the 1825 I had no problems. And the pickit 3 stand alone 3.10 I can not select a 1704, but the 1825 works. Did you use MPLAB X?