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Conference hydra::amiga_v1

Title:	AMIGA NOTES
Notice:	Join us in the NEW conference - HYDRA::AMIGA_V2
Moderator:	HYDRA::MOORE

Created:	Sat Apr 26 1986
Last Modified:	Wed Feb 05 1992
Last Successful Update:	Fri Jun 06 1997
Number of topics:	5378
Total number of notes:	38326

3382.0. "VR241 Problem" by BELFST::MCCLINTOCK (Peter) Tue Jan 23 1990 17:58

    Today I brought home a VR241 monitor from the office with the
    intention of using it for both a Rainbow and my Amige at home.

    Things, however, haven't worked out so well...

    I have wired up the Amiga to 4 x BNC plugs as described in note
    550 or 2105 ... even used separate grounds for each of the signals.

    When plugged in and switched on the display appears to lack sync.
    There are 3 or four flickering images on the screen.  Having checked
    out my connections to ensure that they are absolutely correct, and also
    the switches on the VR241 (external sync etc.) with no improvement I
    decided to see how the monitor worked on the Rainbow. 
                                       
    After connecting it in place of the monochrome display I found
    exactly the same problem as the Amiga.  However, I was able to
    fix the problem and get a perfect display by changing the Rainbow
    Setup to 60 Hz instead of 50 Hz.   
                                  
    This really puzzels me!  This is the UK - 240V 50 Hz why should
    the monitor only work when getting a signal based on 60 Hz?  And
    is there anything I can do with the Amiga to get it to work.
                      
    Just in case it provides any clues the Monitor is a VR241-A and
    claims on the back to work 50/60 Hz 100-110/220-240 V.
                      
    A colleague in the office uses an Amiga connected to a Barco
    display using a similar lead so I will borrow his as a further
    check on the wiring.  In the meantime if anyone has any bright
    ideas I sure would appreciate them.
                      
    Peter

T.R	Title	User	Personal Name	Date	Lines
3382.1	check the cable ?	NOTIBM::MCGHIE	Thank Heaven for small Murphys !	`Wed Jan 24 1990 19:01`	12
	Hi Peter, I successully use a VR241 at home. Here we have 240V/50Hz as well and I have had no problems. My first guess would be that the sync line is not wired properly and/or the monitor is not switched to external sync. However it sounds like you've already checked the switch, so the more likely culprit is the cable ?? Regards Mike
3382.2	I'll check it out ...	BELFST::MCCLINTOCK	Peter	`Thu Jan 25 1990 12:58`	1

3382.3	Cable not guilty.	BELFST::MCCLINTOCK	Peter	`Sat Jan 27 1990 12:29`	10
	> My first guess would be that the sync line is not wired properly and/or > the monitor is not switched to external sync However it sounds like > you've already checked the switch, so the more likely culprit is the > cable ?? I have just tried a friend's cable and it gives identical results to mine. When I get the time I will exchange my VR241 for another one and see if it works any better. Peter
3382.4	Success!	BELFST::MCCLINTOCK	Peter	`Mon Jan 29 1990 14:44`	11
	I changed the VR241 for a different one (older actually) and it works great. I'll ask Customer Services to check out the first one when I take it back to the office. Now, having got over that hurdle ... What are the adjustments that I can make to the monitor to increase the picture area and, is there any useful software that I can use to get a larger workbench etc. area. Peter
3382.5	Vsize and Hsize adjustments are inside the cover...	CGOFS::CADAMS	Clint Adams - Calgary, Canada	`Mon Jan 29 1990 15:12`	16
	I started usinig a VR241 a while ago after my 1084 quit (the green gun went crazy and now no display). I took the VR241's cover off and found the Vsize and Hsize adjustments. I think I adjusted them all the way in both directions. I then got a hold of a preferences repalcement calle PPref10 that lets you specify your Workbench size (ala Morerows). I run a 740 by 230 Workbench. All in all it worked out pretty good, the color and the contrast on the VR241 are better than the 1084 and the flicker (for me anyway) is no worse. If I ever do get the 1084 fixed i'll probably sell it and put the proceeds toward more memory. Regards... Clint
3382.6		NOTIBM::MCGHIE	Thank Heaven for small Murphys !	`Mon Jan 29 1990 18:08`	7
	I never tried to adjust the vertical and horizontal sizes. I have been using morerows bascially since I had the machine. It's kind of odd when I see an Amiga screen that looks smaller. Regards Mike
3382.7	For those following this path...	WOTVAX::GILLILANDP	Philip Gilliland	`Thu Jul 11 1991 12:26`	11
	This note is for those who may be attempting to solve VR241 problems, and are reading through these notes in search of an answer. The solution to the problem in .0 is almost certainly vertical hold adjustment. As stated somewhere in topic 550, the focus and v/hold will usually need adjusting. I had to make adjustments to every single control on mine as the colour balance was completely wrong. If you fancy having a go yourself, you'll need the pocket service guide for the procedure. Also, be careful, there are plenty of lethal voltages inside this monitor. Alternatively, approach one of your friendly terminals engineers; I'm sure he/she'll do it for you for a small fee! Phil Gill.