bryan@mothra.cs.utexas.edu (Bryan Bayerdorffer) (02/20/88)
*sigh*, why ME?! Here I am with my wonderful new Sony MultiScan, only it's not so wonderful. The display is very sharp and very steady, but it's twisted. Here is a more precise description of the problem(s): The display has an hourglass shape, that is, the scan lines toward the top and bottom of the screen are longer than those in the middle, making vertical lines bend outward at top and bottom. This effect is slightly more pronounced near the top left corner. The whole screen image is rotated slightly, but noticably, clockwise. I.e., the scan lines are not quite horizontal; instead they end up lower on the right than they started out on the left. The scan lines also do not appear completely straight, but this may be an optical illusion due to the other problems and the convexity of the tube. The right edge of the display, just where the beam shuts off, is ragged. About 2mm of each scan line is slightly darker than the rest, and this narrow vertical zone flickers. I suspect this is normal, but when the horizontal position control is adjusted to move this region behind the bezel, there is not enough overscan on the left edge, even at maximum horizontal size. The left edge is sharp, but has the hourglass problem. All of this is with NTSC, both interlaced and non-interlaced. I've tried wiring the sync both horizontal/vertical and composite, each with the same results. Has anyone had similar problems with this Amiga/Sony CPD1302 combination, and been able to fix them, specifically the lack of sufficient overscan? Can anyone tell me what it'll take to straighten out the electron beam? Does the monitor need to go into the shop? Please dispense wisdom, o video wizards! And AdvThanksance x 10^6!! ______________________________________________________________________________ /_____/_____/_____/_____/_____/_____/_____/_____/_____/_____/_____/_____/_____/ |_____|_____|_____|_____|_____|_____|_____|_____|_____|_____|_____|_____|_____| _No dark sarcasm in the classroom|_____|_____|_____|_____|_____|_____|_____|___ |____Teachers leave the kids alone__|_____|_____|bryan@mothra.cs.utexas.edu___| ___|_____|_____|_____|___{ihnp4,seismo,...}!ut-sally!mothra.cs.utexas.edu!bryan |_____|_____|_____|_____|_____|_____|_____|_____|_____|_____|_____|_____|_____|
wtm@neoucom.UUCP (Bill Mayhew) (02/22/88)
If the cpd 1302 is brand new as the poster suggests, then the cpd 1302 should be taken to a dealer for a geometry adjustment. I am always an exponent for exercising one's warranty. It's not worth doing one's self what should have been done at the factory. A call to the national service number should yield a nearby qualified dealer. --Bill
pooley@hplabsb.UUCP (Chuck Pooley) (02/22/88)
I'm sorry to hear that you are having such difficulty. I have a couple of questions for you. Hourglass display problem: Do you have any magnets near your monitor like (for example speaker magnets)? If so, this could definitely cause you some mischief. If not, it may need to go to the shop. Rotation problem: Which direction is the face of the tube facing? I'm serious! I have noticed on mine that when the tube faces north, that the horizontal lines are just about level. But, when the tube faces west I see the rotational problem you mention... I believe what is going on here is that the Earth's magnetic field is interacting with the electron beam in the monitor. Overscan problem: I assume you have adjusted the "Horizontal size" control on the back of the monitor? This does have a limited range, but, mine is ok. Hope this helps a little, Chuck Pooley My opinions are my own fault! Please forgive me, I'm still learning #%&! vi.
wtm@neoucom.UUCP (Bill Mayhew) (02/23/88)
As Chuck at hplabsb notes, the Earth's magnetic field can definitely be a source of consternation. In fact, just the other day, I was in the local boob-tube shoppe and noticed a North-South/East-West directional switch big as life on a Zenith rear projection monitor! The instruction manual mentioned right up front that the switch should be set according to the direction that the set is facing. The Tektronix scope I have also mentions in its manual that the trace-rotation pot may need to be tweaked, depending on the strength of the local geomagnetic field and orientation of the scope. (Never mind, of course, big nearby speaker magnets!) --Bill