Conference hydra::amiga_v1

The thin line you see is the tensioning woire for the monitors aperture grill.
ALL trinitron monitors have these lines.  The larger monitors have two.  It is
normal.

mark

    Pardon the spelling on the previous note, I was trying XNotes and
    couldn't figure out how to delete-still can't.  Anyway, Field, er...
    Digital Services get many calls logged from users of workstations with
    the VRT1x trinitron monitors on the exact "problem".  The line is one
    of the trade offs for the crisp, clean, bright, drool drool...display
    of the Trinitrons.  enjoy.
    
    mark (trying to decide on a multisync monitor & FF combination)
    

    Any technical reason for it being 2/3 of the way down the screen (13"
    monitor) rather than say half-way?

    Fascinating .. I just took a look at one of the 19" Trinitron's in the
    lab, and sure enough, two lines - one 1/3 down and a second 2/3 down
    the screen.
    
    [Nice monitor BTW]
    
    Thanks for saving me from pulling boards tonight!
    

I had the same line on my monitor (Sieko 1450) which also has a trinitron tube.

I thought it was a problem until I saw the same line on my trinitron based
monitor here at work. I never noticed the top line on this bigger monitor until
it was pointed out here!

The lines are more visible with against a light or white background...

john

Re: .*

I've been told that the Sony curse is that once you train your eyes to
see the shadow of the tension wire, you will never be able to ignore it
again.

I guess it is sort of like learning to spot the reel change marks on
movies.

	My eye goes straight to those wires every time I look at a VRT19.
The local neural processing in the eye picks out edges. I had my monitor
switched to a VR320. I seem to be in the minority on this. I had no trouble
whatsoever finding someone willing to switch his VR320 for my VRT19.

	There are applications where this is totally unacceptable. We got a bug
report from a medical imaging company. They didn't like spurious lines in their
MR images. Any application where the fine detail contains important information
should not be using these monitors.

re: .6

Thanks.  I was a professional projectionist for several years and now I can't 
ignore the reel change marks on my Trinitron...

--Llew

    My monitor's display is slightly tilted across the horizontal plane 
    - perhaps 1/8" higher on the right side than the left. What's the
    procedure for correcting this skew? There is a large clamp around the
    yoke with a rather large Philips head screw holding it tight. Is this
    the clamp to loosen to adjust the tilt?

That's the YOKE, rotating it will rotate the picture on the display. 

It has lots of voltage near it so be carefull!

    Re .9:
    
>   My monitor's display is slightly tilted across the horizontal plane 
>   - perhaps 1/8" higher on the right side than the left. What's the
>   procedure for correcting this skew? There is a large clamp around the
>   yoke with a rather large Philips head screw holding it tight. Is this
>   the clamp to loosen to adjust the tilt?
    
    Yes, BUT!  Moving the yoke will affect the convergence.  Some monitors
    provide all the necessary convergence adjustments, but others don't. 
    Since you don't seem to have hit on a flock of adjustments to attempt
    to fix the skew, I'd bet your monitor falls into the latter category. 
    
    If you just HAVE to try to fix the skew, I have a few suggestions.
    
    1.	Watch for high voltage (25KV) on the CRT!  It won't kill you, but
    	it'll knock you on your can.  A CRT can take DAYS to discharge.
    
    2.	Mark the EXACT location of the deflection yoke BEFORE you loosen
    	or move it.  In particular, you want to make sure that it doesn't
    	move up or down the neck of the CRT, changing image size and
    	convergence.
    
    3.	Once you've made the image erect, figure out if you're better off
    	than you were before.  Color purity could have been affected by the
    	move.  So could both static and dynamic convergence.  If things are
    	fine, you win; if not, try to get back to where you started.

    
    I understand that convergence is adjusted through purity magnets
    located on the neck and that those magnets are not associated with 
    loosening or tightening the clamp, or moving the yoke. That sound right
    to you?

    Re .12:
    
>   I understand that convergence is adjusted through purity magnets
>   located on the neck and that those magnets are not associated with 
>   loosening or tightening the clamp, or moving the yoke. That sound right
>   to you?
    
    Not really.  The purity magnets are usually separate from the
    deflection yoke, but they are only the FIRST PART of the convergence
    process (especially on three-gun CRTs).  On a shadow-mask (three-gun)
    CRT, the red gun must only "see" red phosphors (and likewise for the
    green and blue guns).  The color purity magnets provide a constant
    deflection to the beam to make this the case.  The rest of the
    convergence process makes sure that the three spots converge on the
    same trio of phosphors at the center (static convergence) and at the
    edges (dynamic convergence) of the screen.
                                              
    Newer systems DO take some shortcuts, especially with single-gun CRTs. 
    Simply stating that "convergence is adjusted through purity magnets"
    seriously UNDERSTATES the process, though.

    Well, while it's under warranty, I plan to drop it off at Westwood for
    an alignment. Plus the convergence near the bottom of the screen
    appears to be off.