Results 1 to 8 of 8

Thread: MS-2930 Setup after repair

  1. #1
    King's Dry Cleaner
    cornerstone's Avatar
    Join Date
    Sep 2013
    Location
    Louisville

    Posts
    384

    MS-2930 Setup after repair

    Iíve got a blast city chassis that was sent out for repair, they replaced some caps I believe, not sure if they touched the fly back.

    I need help with the adjustments. Iíve tuned the SCREEN pot on the flyback to as high as possible without displaying jailbars, and maxed out the Brightness and almost all the way on Contrast.

    But itís still fairly dark.

    Iíve verified the dips are correct and the 31khz VGA cable is not hooked up.

    Iíve read a little that possibly the B+ voltage needs to be adjusted, but Iím not sure where to measure that on a 2930. Iíve found this for what I think is the auto sync chassis:



    Does this apply at all?


    Also, blue and green bias donít brighten it much.

    Any help is appreciated.

  2. #2
    Lucky Glauber's #1 Fan
    DecepticonZero's Avatar
    Join Date
    Mar 2006
    Location
    Boston

    Posts
    4,607
    Find someone else to look over that chassis. I know you don't want to name the repair place, but they're work is always subpar.

    My guess would be that they replaced the flyback with one of the "newly discovered" Chinese flybacks, which are always going to display a dim picture unless you do some other mods to the chassis.
    Last edited by DecepticonZero; 05-23-2020 at 10:29 AM.

  3. #3
    King's Dry Cleaner
    cornerstone's Avatar
    Join Date
    Sep 2013
    Location
    Louisville

    Posts
    384
    Do you know how to identify that flyback?

    Pots are Focus/F1 and Screen. The middle unused slot is marked F2.

    I think the script at the top says muRata.


  4. #4
    King's Dry Cleaner
    cornerstone's Avatar
    Join Date
    Sep 2013
    Location
    Louisville

    Posts
    384
    Photo 2

  5. #5
    King's Dry Cleaner
    cornerstone's Avatar
    Join Date
    Sep 2013
    Location
    Louisville

    Posts
    384
    Photo 3

  6. #6
    Lucky Glauber's #1 Fan
    DecepticonZero's Avatar
    Join Date
    Mar 2006
    Location
    Boston

    Posts
    4,607
    That's an original Flyback, but that's a decent sized crack in it. Is that thing arching?

    My advice still sticks. Send it elsewhere.
    Last edited by DecepticonZero; 05-23-2020 at 07:05 PM.

  7. #7
    King's Dry Cleaner
    cornerstone's Avatar
    Join Date
    Sep 2013
    Location
    Louisville

    Posts
    384
    Would there be a way to check voltages anywhere to determine the symptoms of something like a broken flyback?

    I can send it out in a few months, but Iíd like to see what is possible while itís sitting here.

  8. #8
    King's Dry Cleaner
    cornerstone's Avatar
    Join Date
    Sep 2013
    Location
    Louisville

    Posts
    384

    MS-2930 Setup after repair

    Is it normal to not have a G-Gain pot?



    Just as a follow up, I accidentally adjusted the pot next to the blue cutoff pot, I believe it says SUB CONT VR204. Anyone know what this is called? It generally improved all three levels of color.
    Last edited by cornerstone; 06-02-2020 at 05:54 PM.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •