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Yeah, thanks. But the thing is I bought a readable floppy from local seller, but it still couldn't work

Ha? But I can write 800k. And I bought a floppy that works well, it also can't be read....

em.. I can describe it. For CRT, if you restart it quickly, it can show image faster, the reset is that when you restart the normal Macintosh, the image before mouse and floppy icon shown, and it will restart automatically with the speaker made "beep" sounds, just like normal start up. I tried...

Yeah, I also tried this, I even changed the RAM from 1MB to 4MB and tried to replace some of them to see if the computer can show the correct error. For ROM, I also replaced it.

Oh! This may cause some problems, but for floppy, I use a software called HFVE(maybe this?) on Windows to write system disk.

well... For now, it works well. But I even don't know how I fixed it.... I just replace all the parts except CRT, and check it if anything leaks. I found nothing. Then I put them together and determine the voltage of power supply, and all the capacitances. 5V and 12V all works well. Then I just...

well... I only have this classic Macintosh... But for external hard drive, I make it on basilisk II and MiniVmac. And it can be identified and can start with these emulator. For floppy disk, I used installer from miniVmac and install it with an empty 800k dsk file. It also can be start. And I...

Things change.... After checking the power supply, it can successfully goes into the reading part. The question mark and the floppy icon appears. But I tried internal, external hard drive and floppy disk. All of them can't be read. For the floppy disk, the disk just goes out and the ❌ mark is...

well. If I press programmer's switch, there'll be a sad Mac face and with 0000000D 0000000F error codes, and the reset button works well.

My first language is Chinese. But if you use other language , I can also use translator.

OK, I'll try doing it

When problem occurred, I quickly removed it. Don't worry, I did it only when I cut off power supply.

the speaker made crack sounds.

em.. because my first language isn't English, so I may can't express my idea well.... if there's anything that you can't understand, please tell me, and I'll try my best to let you understand...

Guys, when time goes by , it even become worse. Look for this picture, the machine stops reseting but with error, and there're white pixels appearing from left to right on the screen. During this time, the speaker makes bad sound. This picture is taken I just seen the error occured, and just...

Sorry, I thought I just need to report if it is nearly work. The +5V is 4.985V. And the pin 7 is 12.256, pin 8 is 12.254

Do you have something like troubleshooting tools? I had seen them on apple II, but I haven't seen them on any Macintosh..

Yeah, I tried this method, but it also didn't work....

What should I do... This is very strange.

Oh, sorry. I suspect because.before I pluged in, every thing goes well. But after I tried this, many different problems came