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Main => Monitor/Video Forum => Topic started by: hoytenticer on February 21, 2014, 10:39:37 am

Title: WG K7400 Horizontal Wrap/White Vertical Line
Post by: hoytenticer on February 21, 2014, 10:39:37 am

Gents – I have a Wells Gardner K7400 (WGM2574-U4TS63D). I picked up this monitor about 3 years ago and the problem was present when I purchased it.  I’m not a monitor guy, but I’ve been a tech for years, so forgive me if my terminology is off.  It looks to me like a horizontal wrap issue.  When my pic is centered, I will have a white vertical line on the right side of the screen, (see attached pic).  If I adjust my horizontal position to the right, the white vertical line will move left, gradually fading to red and then going away completely.  This puts my picture about 1” too far right though, useable but not perfect.  I’ve tried adjusting my horizontal pots on the control board and VR 701 on the main board with no luck.  I’ve taken a quick peek at caps and don’t see any domed tops, but haven’t pulled the main board and checked it with a meter or scope. I have a monitor guy here at work that would be willing to look at it, but I want to try and do it myself first.  Should I just re-cap the thing or do any of you know of a specific fix to the stated problem.  Thanks in advance for your help.

Title: Re: WG K7400 Horizontal Wrap/White Vertical Line
Post by: ed12 on February 21, 2014, 11:31:25 am

yes recap it first
then see if there is a centering pot and or jumper..

ed

Title: Re: WG K7400 Horizontal Wrap/White Vertical Line
Post by: hoytenticer on February 27, 2014, 10:23:06 am

OK.  More to this story.  I brought the deflection board into my monitor guy, (he's not an arcade monitor guy, but has been repairing PC and terminal monitors for years) and he checked and went through and replaced the caps in the horizontal portion of the board. He didn't see any bad caps, but replaced them anyway.  I reinstalled the deflection board, same problem.  Here's where it gets weird on my end, I'm not convinced that I have a K7400 deflection board in this chassis now.  Reading a few threads on identifying between U2000/U5000 and K74XX/K75XX has me confused.  My flyback transformer is right to the edge of the pcb, that seems to indicate a U2000 or U5000 pcb correct?  Can a U2000/U5000 deflection pcb be used in a K74000 tube and chassis?  If I do have the U series deflection board, does my pic give an idea on a known problem?   Thanks guys.

Title: Re: WG K7400 Horizontal Wrap/White Vertical Line
Post by: buffett on March 08, 2014, 02:09:25 am

without a pic of the chassis from a top down view we cannot tell you what you have.

take some pics of your chassis.

Peace
Buffett