Last post by Theta-K7 - November 22, 2019, 08:45:32 pm
Well, luckily I noticed pretty quickly that it wasn't looking like most of the dirty keyboards I've been cleaning up, so I stopped before doing anything that shows. Lesson learned. Soap and water only on NeXT keyboards.
Last post by smyke - November 22, 2019, 06:54:55 pm
Thanks for the suggestions. I removed all RAM sticks (8 original, 4 aftermarket). I re-installed 4 modules starting at the outer edge of the board. There was no change to this behavior, swapped in 4 different modules, no change. What capacitors usually need changed? I see a mix of SMD and through hold electrolytics. None of them seem to be leaking. The board actually looks brand new. Here is a picture of what I see when the system turns on, when on this screen, I cannot do anything, seems frozen.
Last post by barcher174 - November 22, 2019, 02:13:56 am
Based on your description I think it's failing now before the POST. A pic might help. Unplug everything from the board and try swapping RAM. You need a minimum of 4 sticks starting at the outer edge. Capacitor replacement is usually the next step.
Last post by smyke - November 21, 2019, 07:14:01 pm
I was recently loaned a 68030 NeXT Computer for cleaning/troubleshooting (it was in unknown condition). As this is my first experience with NeXT, all technical aspects of booting it were new to me. I dis-assembled the cube and cleaned all components. After re-assembly, I powered it on for the first time. The screen came on, I heard a sound out of speakers connected to the monitor, a 'plop' sound. NeXT logo on the screen, and nothing else. I researched and found that after removing the PRAM battery, it defaults to netboot. The battery is bad, only reading 2v. Further reading had me boot to rom monitor by Command + ~ during power on. This brought me to a screen showing "NeXT ROM Monitor 1.0 (v41)" at the top of the screen. This never goes away and I do not see anything else; no keypresses do anything either. I do not see any NeXT prompt, nothing. Holding the power button on the keyboard does not power off the system. If I press Command + ~ again, the 'NeXT ROM Monitor..." banner flashes. To troubleshoot, I first disconnected the MO drive, same issue, then disconnected the hard drive, same issue.
Does anyone have any idea what to try next to troubleshoot this issue? I am not sure how to continue.
Last post by Theta-K7 - November 21, 2019, 07:56:21 am
I recently acquired a little ultrasonic cleaner, so I've been disassembling and cleaning all my keyboards. Throwing the keycaps in the ultrasonic cleaner for 10 minutes with a couple of tablets of denture cleaner works wonders.
While I've had each keyboard apart, I've been cleaning up the case/body with isopropyl alcohol and cotton wipes. This has worked without any concern until I got to my first NeXT keyboard. I noticed as I was wiping the keyboard body that my cotton wipes were getting very black, much more than with any of my other keyboards. Growing concerned that I was actually removing the surface of the keyboard case, I stopped. No visible damage done, fortunately.
But this raises the question: Is isopropyl alcohol a no-no for cleaning a non-ADB NeXT keyboard, or is my keyboard just really, really dirty?