Does anyone know of working links to Disk II drive troubleshooting guides?
I found links in some forums here but they don't work for me.
My first Disk II drive is working great, I can create bootable disks with AdtPRO (great tool!).
The issue is with my 2nd Disk II drive which I recently bought on ebay:
1. When connected as the first drive, it will not read any disk. It powers on and just keeps spinning forever. I cleaned the drive head but it did not help. Worse, it seems to be erasing disks :-(
Any disk I try on this drive is no longer recognizable by my good drive. I need to reformat and re-write on those disks.
2. Connected as a 2nd drive, I tried Locksmith on it. Disk speed test makes it spin but does not show any lines/measurements. Erase option with Locksmit shows the EEE.... status.
If you know of working guide links, please let me know. Thanks.
disk002.jpg
Check the '3906 at Q2, the 'LS215 at B4, the ULN2003 at D4, and the CA3146 at A3.
Thanks Robespierre, the LS125 seems to be the issue. It looks fried and leaked upon close inspection.
The 74LS125 is the most common chip to blow on the Disk ][ Analog Card. It also often causes the disk erasure issue.