DEC VR260 service docs / common failure modes?

I just remember wrestling with one of those and determined I did not have a matching system. So I traded for something else about 2 years ago, or so. Mine is photographed on vintagecomputer.net/dec/vr260 I believe Bill On Mon, Aug 10, 2020, 1:53 PM Douglas Taylor via cctalk < cctalk at classiccmp.org> wrote: > That's a very interesting comment, got me to thinking. The VR150 was > connected to a working Vax Station 3100 with the proper DEC cable and I > observed the non-working behavior. However, the color RGB output from > the VS3100 works just fine, I boot the machine into VMS and runs just OK > (but using a different monitor and video cable). > > In the VS3100, at least the one I have M78, I think the monochrome video > output is separate from the RGB outputs. I wonder if that part of the > video circuit is not working correctly? > > I understand your comment about the rate, the VR150 is a non-standard > video refresh rate. I think it is hard wired just for the DEC video > output. > > Doug > > On 8/10/2020 1:37 PM, Bill Degnan via cctalk wrote: > > One comment...if you don't have the correct cable and a system that is > set > > for the correct refresh rate, it may appear that the monitor does not > > work. Be sure you have compatible equipment. This was a specialized > > display. > > Bill > > > > On Mon, Aug 10, 2020 at 1:19 PM Douglas Taylor via cctalk < > > cctalk at classiccmp.org> wrote: > > > >> Josh; > >> > >> I have a DEC VR150 that is nearly functional; shows full screen but the > >> H/V are not in any sync at all. Would love to use it with a VaxStation > >> 3100. > >> > >> Opened it up and found it quite a complicated monitor, not like a > simple > >> PC monochrome monitor. > >> > >> Purchased a microfiche manual off ebay, but haven't been able to view > it > >> yet. > >> > >> Eager to hear how you do with your larger monitor. > >> > >> Doug > >> > >> On 8/9/2020 3:10 AM, Josh Dersch via cctech wrote: > >>> Hi all -- > >>> > >>> Picked up a non-functional but otherwise nice looking DEC VR260 (19" > b&w > >>> monitor) on the cheap, hoping to use it with my VAXstation 2000. From > >> what > >>> I've read, these were never the most reliable displays. Curious if > >> anyone > >>> has any information on common failure modes, or has service docs > >> squirreled > >>> away somewhere. I've at least found schematics, so I have something > to > >> go > >>> on, but it's not exactly the most straightforward design I've poked > at. > >>> > >>> Right now when powered up I hear a repeated low hum from the > transformer > >>> followed by a soft ticking noise so I'm guessing I've got power supply > >>> issues at the very least. Unsure what I should expect the monitor to > do > >> if > >>> it's not being fed a valid video signal (I haven't yet tried to hook > the > >>> VS2000 up to it) -- whether it'll go into free-running mode or do > mostly > >>> nothing until it has something to sync to... > >>> > >>> Thanks as always, > >>> Josh > >> > >> > >