Started by bobo68, February 24, 2016, 08:51:35 pm
Quote from: "bobo68"I did more analysis but the printer would still not print. :-/The printer reacts to nppower on/off commands. It also is able to communicate back its status (dialog saying no paper or hood open).I disassebled it and found the "magic" test print button (it is on the pcb on the underside). Although the service manual says it would print a test page if you press the button, it does not. :-(I'm still searching for a way to get a more expressive status from the printer. Do I have to hack a C program do get it?
Quote from: "bobo68"I had some success. Found a utility named printer preferences ("PP") on a NeXT PD-CD. It show the status of the printer and allows to make some settings.After I fed the printer with fresh paper it started to print but would not be able to pull the paper through (exept for one time).Here is an interesting maintenance video for the printer: https://dl.dropboxusercontent.com/u/1429222/Videos/nextprinter.mov (can somebody copy it to the file area?).
QuoteAfter I fed the printer with fresh paper it started to print but would not be able to pull the paper through (exept for one time).
Quote from: "pentium"QuoteAfter I fed the printer with fresh paper it started to print but would not be able to pull the paper through (exept for one time). It's quite normal for the intake rollers to lose their ability to grip the paper. I believe Rob still has a stock of replacement rollers.
Quote from: "rockus"Greetings,I recently acquired a NeXTlaser for my TurboColor and it had the same symptoms:- starting up when a print job was placed in the queue- the queue saying Printing...- but never doing anything- not even with the infamous test button on the bottom sideOver the last couple weeks I worked on the problem on and off and dug deep into the electronics and test modi and even built myself a diagnostic unit that could be connected to the diagnostic port on the underside.So, what was the culprit? It's the 210degC thermo safety switch that's failed open. I could revive the original one by freezing it for 2 days. But then it only worked once.So I sourced around and found replacement parts and yesterday night I replaced it - together with a bit of patching the mounting, though.I put in this one:Honeywell 3450RC 80040501(e.g. Mouser 785-3450RC-80040501)If wanted, I can post photos of how I mounted this in the printer. The original mounting can't easily be used. But the most imporant part: it's printing again![Since the printer hadn't been used for months at least, I still need to do cleaning, though]---I also had then the problems of the paper not being pulled in properly. This was simple: the little switch, that detects if paper is in the tray, sometimes was stuck in the down position and prevented the paper from being pushed up completely against the intake roller. Once I made sure to always push that little switch up, the intake was fine.Hope that helps,Oliver
Quote from: "rockus"With "little switch" I meant the paper sensing switch on the tray side of the printer. The one, that's in focus on this picture, looking into where the tray slides in (is this the "tray bay", then? ):Oliver
Quote from: "Rob Blessin Black Hole"Replacing intake rollers often didn't seem to resolve this even with some pristine printers so I gather if I make sure that level is open or flipped back toward me, I may be in business at least on some of these printers