Re: U5000 "singing"

David Shoemaker wrote:
>
> R760 was bad (33K ½ watt). I have had other monitors with the same
> problem and they "tick". Guess the singing was just really fast ticking.
>
>
>
> Replaced that part and cap kit and it looks good.
>
>
>
> David
>
>
>
> *From:* owner-rasterlist@vectorlist.org
> [mailto:owner-rasterlist@vectorlist.org] *On Behalf Of *David Shoemaker
> *Sent:* Wednesday, November 21, 2012 1:48 AM
> *To:* rasterlist@vectorlist.org
> *Subject:* RASTER: U5000 "singing"
>
>
>
> Working on a 25" U5000, Power it up and it makes a hissing/singing
> sound.
>
>
>
> I have verified the power supply section is good (isolated the section
> by pulling the output wire up and hooking it up to a lightbulb, B+
> right at 118 that way).
>
>
>
> I verified the HOT is good.
>
>
>
> I figured the flyback was arcing internally so I swapped it with
> another. Same sound.
>
>
>
> B+ is up over 220v, so there is something wrong, but I am not sure what.
>
>
>
> Same noise in 15khz or 25khz modes.
>
>
>
> Suggestions?
>
>
>
> Thanks,
>
> David
>
Hi David,

Thanks for the tip, adding to our U5000 notes...

John :-#)#

-- 
John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 
Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames)
                 www.flippers.com 
"Old pinballers never die, they just flip out"
---------------------------------------------------------------------------
** Unsubscribe, subscribe, or view the archives at http://www.vectorlist.org
** Please direct other questions, comments, or problems to chris@westnet.com