1. MARGINAL DRIVE ID SWITCHES:
I have at least two Atari 1050s with marginal drive ID selection switches. They "prefer" to be Drive 1. When I switch the switches to Drive 2, even after a power cycle they want to stay as Drive 1. Sometimes, as I press against the switches or as I release them, they'll go back and forth between answering as Drive 1 and as Drive 2. I'm suspecting that the switches are oxidized with age. At least two different 1050s exhibit this problem. Is this a known issue? If I don't want to hard-wire a setting, are other people replacing these, and if so, from where? Or do they do something else?
2. INTERMITTENT. NO FIRMWARE FUNCTIONS AFTER POWER-CYCLE, REGULATORS ARE HOT TO TOUCH:
I have one Atari 1050 that I'd prefer to use because it does a slightly better job of reading marginal sectors, but it has an intermittent problem. When the drive works, it works great. On any subsequent power cycle, when you turn on the drive, it does nothing. When you close the drive's door, it does nothing. (Connected to the Atari or not, when it doesn't work, there is no busy light and no spin-up.) The large metal wall in the back of the drive seems hot to the touch on the back-left side (with the front drive door facing you) while a "good" 1050s might only seem very warm. Tried two power supplies, one rated 9.5VAC/40VA (11.2VAC actual) and the other rated 9.0VAC/31VA (10.5VAC actual), no change, and both power supplies work fine with other 1050s.
EDIT TO ADD: From memory, the regulator on the back-right side seemed to run fairly cool.
I'm hoping that these are known and/or common problems with well-worn answers. But I'll take anything you can offer.
Edited by jmccorm, Sun Feb 11, 2018 8:02 PM.