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  • Tech: Help with 14k3101 pincushion / hourglass no horizontal adjustment

    From [email protected]@21:1/5 to All on Sat Jul 7 19:57:07 2018
    Hi,
    I don't normally ask for help but i have met my match with this Wells Gardner 14K3101 / megatouch Type-67 (I think similar to U3100).

    When i first got it, it would warm up and go into shutdown, B+ was 127 Volts. i adjusted to 98V.
    it had a red tinge and pincushion.

    I replaced all electrolytic caps with new.

    red tinge was gone but still pincushion both sides.

    This is when i noticed that H. Size / trap / pincushion / pincush coil (L1) have little or no effect on display.

    I found D3 shorted and C4 failed. I replaced both.

    I then re-flowed all solder joints on main and neck board. no change.

    I pulled L1 and tested, also checked board traces back to Q1, Q2, Q3.

    This monitor is from a Megatouch and i have found other posts with the exact same problem yet i haven't found any fix. any help would be appreciated.


    Regards,
    Shaun

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  • From [email protected]@21:1/5 to All on Sun Jul 8 13:32:39 2018
    I found this post of same problem

    http://forum.arcadecontrols.com/index.php?topic=90747.0

    Shaun

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  • From John Robertson@21:1/5 to [email protected] on Sun Jul 8 15:32:35 2018
    On 2018/07/07 7:57 PM, [email protected] wrote:
    Hi,
    I don't normally ask for help but i have met my match with this Wells Gardner 14K3101 / megatouch Type-67 (I think similar to U3100).

    When i first got it, it would warm up and go into shutdown, B+ was 127 Volts. i adjusted to 98V.
    it had a red tinge and pincushion.

    I replaced all electrolytic caps with new.

    red tinge was gone but still pincushion both sides.

    This is when i noticed that H. Size / trap / pincushion / pincush coil (L1) have little or no effect on display.

    I found D3 shorted and C4 failed. I replaced both.

    I then re-flowed all solder joints on main and neck board. no change.

    I pulled L1 and tested, also checked board traces back to Q1, Q2, Q3.

    This monitor is from a Megatouch and i have found other posts with the exact same problem yet i haven't found any fix. any help would be appreciated.


    Regards,
    Shaun



    You need to do a ring test on the monitor yoke as it may have one or
    more shorted windings. This could lead to pincushion weirdness.

    I'm not certain, but I believe that the Bob Roberts LOPT/Ring Tester
    will work for yokes, and I can test that hypothesis tomorrow (Monday) if
    you are interested in buying one of these from us. I happen to have a
    yoke that tests bad with my Sencore test fixture, but hadn't thought to
    poke it with the flyback ring tester...

    https://www.flippers.com/catalog/product_info.php/blue-flybacklopt-ring-tester-p-19

    Send me an email or watch the info page on my sales section to see if I remember to do this...

    John :-#)#

    --
    (Please post followups or tech inquiries to the USENET newsgroup)
    John's Jukes Ltd.
    MOVED to #7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3
    (604)872-5757 (Pinballs, Jukes, Video Games)
    www.flippers.com
    "Old pinballers never die, they just flip out."

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  • From [email protected]@21:1/5 to All on Sun Jul 8 17:11:34 2018
    John,
    Thanks for that info. Ill check back in with you in a few days to see if you are able to test it with that q tester.

    I am in ontario so nice to know about your website.

    I am also going to look around to see if i have a tube and yoke that i can try to see if i get any adjustments. I was only thinking of the chassis so im grateful for your suggestion.

    Regards
    Shaun.

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  • From John Robertson@21:1/5 to [email protected] on Mon Jul 9 10:21:37 2018
    On 2018/07/08 5:11 PM, [email protected] wrote:
    John,
    Thanks for that info. Ill check back in with you in a few days to see if you are able to test it with that q tester.

    I am in ontario so nice to know about your website.

    I am also going to look around to see if i have a tube and yoke that i can try to see if i get any adjustments. I was only thinking of the chassis so im grateful for your suggestion.

    Regards
    Shaun.


    Hi Shaun,

    Bob's LOPT/Flyback tester did not show a problem with a yoke that had
    shorted windings - showed normal rings in the green zone. The same tool
    works very well for flybacks though, we use it a lot in the shop for
    testing those before we rebuild monitors, along with his ESR meter...

    My Sencore Computer Monitor Analyzer model CM-2125 did find the shorted
    winding in the yoke.

    I am not sure if my (new to me) older Sencore TV-VTR-MATC & Video
    Analyzer will work although it does have some sort of ring test. Just
    picked up that toy, which should help with fixing early 70s video games
    that used TVs that were either vacuum tube or transistorized.

    John :-#)#

    --
    (Please post followups or tech inquiries to the USENET newsgroup)
    John's Jukes Ltd.
    MOVED to #7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3
    (604)872-5757 (Pinballs, Jukes, Video Games)
    www.flippers.com
    "Old pinballers never die, they just flip out."

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)