Blast and Astro city projects

[jimmyjames]

Sounds to me like there's something wrong with the chassis? The tube is obviously fine. There's no reason why it shouldn't work (although will it look good is a different matter entirely).

So you picked up a full MS8-29 monitor, had vertical collapse, sent the chassis in for repair. Received a different, said to be working chassis. Am I following this correctly? Did you test it on the original monitor?

two sets of ms8-29s fresh from sharp and neither worked and they both didn’t have the power to project the image. The image came up light purple And there was a cracklings high pitched buzz coming from the neck. Here’s a link so you can hear it as the ones I posted don’t have sound https://youtu.be/pJCaXMuGuDQ

 

[jimmyjames]

ok so @nem I decided to check both ms8-29s and yokes and well everything works. I pulled the astro monitor out and put back the blast now I’m gonna button up this and I’m back to messing with the blast. Am I missing something on the blast amp up? Its a standard 15 pin sega amp up all the pins are the same aren’t they? Anyway here is a pick of both chassis and the yokes readings. I currently have a ms8-29 x2, ms8-29 yokes x2, ms9-29 x1, ms2932 x1, a ms2932 with heat resistor swap and a ms2931 yoke. I used the ring on the ms2931 and the both ms8-29 chassis and yoke last night when it was making that sound.

 

[Hatsune Mike]

The Blast tube will never look good with the MS8-29 or MS9-29 yoke on it, as the deflection angle is not the same. The top and bottom will forever have convergence issues.

 

[Metal Slug]

However when transferring back to the ms2932 chassis with the heater resistor trick it was fine.

Do you mind elaborating what the "heater resistor trick" is? I am troubleshooting a couple 2931 chassis, and this piqued my interest.

 

[jimmyjames]

However when transferring back to the ms2932 chassis with the heater resistor trick it was fine.

Do you mind elaborating what the "heater resistor trick" is? I am troubleshooting a couple 2931 chassis, and this piqued my interest.

With a ms2932 Chassis you can use a resister to make the picture brighter but it’s not a really good fix just a temporary solution. I would imagine it could possibly shorten the lifespan of the tube or the chassis also.