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linearity issues on new chassis


taito

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Hi Joey.

 

I got the wie-ya chassis going. It's brand spanking new but it's got vertical linearity issues.

 

The bottom third/half of the screen looks pretty good but then the raster gets wider and wider between each pass. A picture tell a thousand words.

 

 

20170806_194426.thumb.jpg.38130231b4f62f2729f159b6e0a34282.jpg

 

[ATTACH=CONFIG]114400[/ATTACH]

 

20170806_194809.thumb.jpg.35bb4c1414968f5a39386e5f2304c340.jpg

 

I'm hoping you could make some suggestions where to look.

 

Vertical deflection transistors?

 

Is this something you see in the event of a deflection yoke miss match?

 

Thanks. Ro

20170806_194514.thumb.jpg.421b799087160ac59c98d97805340ebe.jpg

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It's nothing to do with transistors - it will be a miss match between the yoke and the deflection circuitry. By that I mean the intrinsic design of the circuit, not specific parts.

 

Is this a chassis you have married to a generic tube?

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Thanks Hopepin. I was hoping it wasn't that. :(

 

Could it be because.....it's a heap of JUNK! :realmad:

 

 

It's nothing to do with transistors - it will be a miss match between the yoke and the deflection circuitry. By that I mean the intrinsic design of the circuit, not specific parts.

 

Is this a chassis you have married to a generic tube?

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Nothing to do with "junk" - just a miss match.

 

Wei Ya is a well respected Taiwanese company.

 

Actually we have just purchased a heap of their coin mechs to include in our pinballs.

 

Maybe you need to look for a different tube?

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Nothing to do with "junk" - just a miss match.

 

Wei Ya is a well respected Taiwanese company.

 

Actually we have just purchased a heap of their coin mechs to include in our pinballs.

 

Maybe you need to look for a different tube?

 

Yeah, nah...I was just having a laugh...cheers Homepin ;)

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Remember I did say there was a lot more involved than just having the correct neck board socket , As Mike has kindly pointed out you have a total mismatch which is what I told you from the start.
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Starting to get somewhere....linearity issue solved.

I assumed the switch on the chassis was for frequency. Only after I examined the circuit from the underside did I realise it dropped in some resistors for a larger screen no doubt. Lol.

20170808_023925.thumb.jpg.809b2d211e353dd09290e7a981a10f22.jpg

 

Not the best picture in the world but I can play games now. :)

 

Took a picture just now while I was adjusting the monitor.

 

20170808_225937.thumb.jpg.c24886e4011965aeac1c875f2a495fe0.jpg

Edited by taito
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Remember I did say there was a lot more involved than just having the correct neck board socket , As Mike has kindly pointed out you have a total mismatch which is what I told you from the start.

 

Sure Joey, a bit of work involved, but I knew what I was getting in for when I bought it. It was never going to be straight forward, but my options, (everyones options) are getting incredibly narrow if you want to stay with tubes. I can appreciate you getting tired of this. I certainly would be!

 

All good mate

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sure joey, a bit of work involved, but i knew what i was getting in for when i bought it. It was never going to be straight forward, but my options, (everyones options) are getting incredibly narrow if you want to stay with tubes. I can appreciate you getting tired of this. I certainly would be!

 

All good mate

LCD rules!!

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