mkstabd
Member
I just completed some cleanup work on my dual floppy drive enclosure (QumeTrak 842 drives) and ran into something that confused me. Perhaps one of you has seen this before and can provide some insight.
After using my system a lot over the past week, I noticed the drive doors were starting to stick a little bit. Sometimes, the drive would open right up with no problem. Other times, it would take 4 or 5 attempts to get them to open, even when the drives were powered down. It turns out the door lock solenoid pin was sticking to the coil and not releasing because of a very sticky spacer between the E-clip/spring, and the coil mount. This spacer is what confuses me. It seems to be made out of some kind of wax or sticky resin. I'm not sure why it's sticky like this. It's the same story on all 3 of my drives, plus another QumeTrak 842 I just bought off of eBay. The only way I could keep the solenoid working freely is to thoroughly clean all the goo off of the pin, spring, e-clip and the pin hole in the coil, position the spacer so it was centered over the hole, and then very gingerly reinsert the pin and spring without making contact with the sticky spacer. After that, plus cleaning all the mechanism parts, the drive unlatches very smoothly now 100% of the time (for now, at least.)
My question is, why is that "padded washer" (as it's called in the service manual) made of this sticky waxy substance? My theories are: 1) it was made that way originally to offer some kind of lubrication, but has essentially decomposed over the years into this sticky mess, or 2) maybe it was meant to be sticky and pliable to act as a type of noise dampening cushion for the pin, while sticking to the coil in a way that supported vertical orientation of the drive. Whatever the reason, it seems like a problem waiting to happen again. As the goo seeps around the spring, it will eventually contact the pin again and I'm right back to having to clean it off.
Can anyone help me understand what this spacer is all about?
Thanks,
Ty
PS For those interested, here's a new page on my site that shows some pics of the floppy cleanup work (still under construction.) I'd really appreciate any feedback (especially any corrections) regarding the content of the site.
After using my system a lot over the past week, I noticed the drive doors were starting to stick a little bit. Sometimes, the drive would open right up with no problem. Other times, it would take 4 or 5 attempts to get them to open, even when the drives were powered down. It turns out the door lock solenoid pin was sticking to the coil and not releasing because of a very sticky spacer between the E-clip/spring, and the coil mount. This spacer is what confuses me. It seems to be made out of some kind of wax or sticky resin. I'm not sure why it's sticky like this. It's the same story on all 3 of my drives, plus another QumeTrak 842 I just bought off of eBay. The only way I could keep the solenoid working freely is to thoroughly clean all the goo off of the pin, spring, e-clip and the pin hole in the coil, position the spacer so it was centered over the hole, and then very gingerly reinsert the pin and spring without making contact with the sticky spacer. After that, plus cleaning all the mechanism parts, the drive unlatches very smoothly now 100% of the time (for now, at least.)
My question is, why is that "padded washer" (as it's called in the service manual) made of this sticky waxy substance? My theories are: 1) it was made that way originally to offer some kind of lubrication, but has essentially decomposed over the years into this sticky mess, or 2) maybe it was meant to be sticky and pliable to act as a type of noise dampening cushion for the pin, while sticking to the coil in a way that supported vertical orientation of the drive. Whatever the reason, it seems like a problem waiting to happen again. As the goo seeps around the spring, it will eventually contact the pin again and I'm right back to having to clean it off.
Can anyone help me understand what this spacer is all about?
Thanks,
Ty
PS For those interested, here's a new page on my site that shows some pics of the floppy cleanup work (still under construction.) I'd really appreciate any feedback (especially any corrections) regarding the content of the site.