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Main => Monitor/Video Forum => Topic started by: Funnel on July 03, 2011, 10:01:56 am

Title: Toei A252 Monitor problems. Any fix? Help?
Post by: Funnel on July 03, 2011, 10:01:56 am

I have one of these and I really want to fix it for my candy cab and neo geo 4 slot board. It has a Toei A252 chassis and a Toshiba tube. When I turn on the monitor, it makes an annoying *beeeeeppppzzzzzz* sound and it displays a whiteish line in the middle of the screen. Pics:

Title: Re: Toei A252 Monitor problems. Any fix? Help?
Post by: boardjunkie on July 03, 2011, 12:57:01 pm

Obviously the deflection is not working right...hence the line in the middle. Neither the H or V is right since the line doesn't fill the screen L to R.

First off, is that tube original to the chassis? If its something someone just threw together to try and make it work, you may hit a wall. The yoke impedance must match what the deflection amps want to see.

http://arcarc.xmission.com/PDF_Monitors/Toei%2019in%20CMA20HC%20Manual.pdf (http://arcarc.xmission.com/PDF_Monitors/Toei%2019in%20CMA20HC%20Manual.pdf)

See if that matches your chassis. Also, the pix tube types that chassis was designed for are listed in the parts list.

Is this a 19" or 25"?

Title: Re: Toei A252 Monitor problems. Any fix? Help?
Post by: boardjunkie on July 03, 2011, 01:01:13 pm

http://www.myslotnotes.com/Work%20PDF/result0654.pdf (http://www.myslotnotes.com/Work%20PDF/result0654.pdf)

That may help you get it going.

Title: Re: Toei A252 Monitor problems. Any fix? Help?
Post by: Funnel on July 03, 2011, 01:43:33 pm

Dang! I forgot to add, the monitor size is 25". I'm gonna check that manual now... 

EDIT: Took a look at the Chassis and found a blown fuse... 250V 800mA. Going to find a replacement tomorrow and see if the monitor returns to normal. I'll keep ya guys posted.

 

Title: Re: Toei A252 Monitor problems. Any fix? Help?
Post by: lilshawn on July 03, 2011, 05:41:53 pm

Quote from: Funnel on July 03, 2011, 01:43:33 pm

Dang! I forgot to add, the monitor size is 25". I'm gonna check that manual now... 

EDIT: Took a look at the Chassis and found a blown fuse... 250V 800mA. Going to find a replacement tomorrow and see if the monitor returns to normal. I'll keep ya guys posted.

 

uhm... if a fuse is blown...especially enough to vaporize the element inside like that, there is something defiantly wrong.

Title: Re: Toei A252 Monitor problems. Any fix? Help?
Post by: boardjunkie on July 03, 2011, 10:21:38 pm

Yep. You can tell if the fault was a dead short just by looking at how the fuse blew. Dead shorts will cause the element inside the fuse to splatter all over the glass casing. If the element is just burned open in the middle it was a "minor" overcurrent situation.

Title: Re: Toei A252 Monitor problems. Any fix? Help?
Post by: Funnel on July 04, 2011, 09:29:34 am

Damn... how do I find this "dead short" ??? What causes it?? I'm pretty confident with soldering electronics and discharing monitors so