DEC VR260 service docs / common failure modes?
dj.taylor4 at comcast.net
Mon Aug 10 12:53:26 CDT 2020
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.
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
> On Mon, Aug 10, 2020 at 1:19 PM Douglas Taylor via cctalk <
> cctalk at classiccmp.org> wrote:
>> 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
>> 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
>> Eager to hear how you do with your larger monitor.
>> 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
>>> I've read, these were never the most reliable displays. Curious if
>>> has any information on common failure modes, or has service docs
>>> away somewhere. I've at least found schematics, so I have something to
>>> 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
>>> 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,
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