Atari 1050 drive "Boot Error"

[powerlot]

Hi all

Now that I made my cable I've got the next issue:

One of the floppy drives I'm restoring does everything these drives do, but only results in continuous "BOOT ERROR" when trying to boot a DOS disk.

I checked and did everything one would usually do on a vintage floppy drive these days but it didn't help.

Thankful for any suggestions where to start, as I'm new to Atari floppy drives. In the mean time I'll study the attached manual.

 

[powerlot]

It's pretty quiet in the Atari section, huh?

I procured a second working drive and could exclude the drive mech and custom chips from being faulty. They all work when inserted in / connected to the board of the good drive.

Next I'll compare the waveforms in the manual with a scope...

 

[LiqMatrix]

It's pretty quiet in the Atari section, huh?

AtariAge forums are great for Atari computer/console related posts.

 

[powerlot]

AtariAge forums are great for Atari computer/console related posts.

Thanks but I don't want to register to (yet) another forum only to make few posts and disappear again...

I tried to find any signal but it's just silent. I think the LM733 may be dead, as the other components around the read circuit don't look faulty.

Now to find one...

 

[powerlot]

Replacing the LM733 didn't change anything. There's still some weird noisy output on TP5. I have no idea what could cause this.


Any ideas are welcome