I am getting back in to the 8-bit scene after quite a few years away. I have a 1050 with a Lazer/USD upgrade, and it has suddenly started giving me boot/read errors. I have been using it for a couple of weeks since getting it out of storage. I have done some very basic maintenance, using IPA on the drive head to clean it (it was quite dirty), and have put some lithium grease on the spindles (I'm not sure if I should use any anywhere else)? The drive was fine until earlier today, but suddenly started giving me boot/read errors. I checked the drive with the lazer utilities disk, and the drive RAM/ROM passed OK, but when I do an RPM test, it gives me "ERROR can't measure".
I have borrowed a couple more 1050's (also lazer enhanced). One gives "RPM too low"/"ERROR can't measure" messages when I do an RPM test. The third 1050 is well behaved. When I try to do a sector copy from this drive to my own drive (the one I have cleaned), my drive sounds like it formats the destination disk (I hear the drive head stepping across the disk several times), but then it reports a disk error on the (my) destination drive. The drive head seems to be moving around the disk appropriately (from the sound of it, but I haven't checked with the case removed). When I use my drive as the source drive for a sector copy, it gives a disk error straight away.
The drive started giving me boot errors when I was trying to read some old disks. I am hoping to unearth some missing programs, but want to get all three drives working first, as I expect some of the disks to be of fairly marginal quality, so want to be able to read on several drives. I haven't tried re-cleaning the drive head on my drive yet, just in case the old disks I was using where toxic, so to speak.
Both defective drives were made in Singapore, and have a Tandon drive mechanism.
Any ideas on what next steps I should take?
I have also built an SIO2Pi cable, so can copy ATR files from the internet to the working 1050 (I copied a few ATRs to my 1050 when it was still working, and also managed to make a working backup of my original Mercenary disk, using the Lazer backup software), so can run further tests if anyone can point me in the direction of appropriate ATRs?
My goal is to get both defective drives running correctly. I'm including a photo of the Lazer/USD upgrade in case anyone is interested in these upgrades (the wire heading off from the chips is for switching between Lazer/USD mode). I should point out I am not a hardware hacker, though I have access to people who do understand electronics, etc. I've also had a quick skim through the 1050 field service manual, but am hoping that someone more knowledgeable than me can point me in the right direction.
Any help would be very much appreciated. Also, hope I am not trading on anyone's toes here, as I am a new member!