Blast City Repair Question

[neofrank]

OK, so I am about to pull my hair out with this one, but thats half the fun of the hobby right?

I have a Blast City cab, monitor was working fine, until I had a jamma board hooked up one day and it just cut off, no big spectacle, just acted like I turned off the power, now I get two clicks like the protection circuit or something is cutting off power to the monitor right after it turns on. Anyways, I found someone to take a look at the chassis, but before I got shipping it to them, I wanted to see if I should check power levels anywhere to make sure it isnt an level issue.

That is as far as I have gotten, since this is an enclosed power supply, and the monitor has its own ACtoDC conv. I just didnt know where to look to meter it, or if its even necessary, since I KNOW the jamma harness and JVS power harnesses are all getting power (I can run jamma and JVS boards as long as I have video hooked up to an external source)

The last thing I noticed is on the back of the power supply it is suppose to have a button thats labeled circuit protection, and mine either doesnt have it or its been pushed inside the power supply, cause it has just and empty hole.

(BTW, the flyback isnt pouring goop, so I think thats fine and the chassis is a Nanao MS29-31A)

Thanks for any information on this issue.

[grantspain]

maybe the hot has shat out

[Mellor]

Has the fuse gone?

Does it squeal (HV) for a brief second?

[neofrank]

Fuses on both the chassis Power Supply are good, and no squeal.

So basically with this information is it safe to say the chassis is most likely the problem? I would just hate to send out the chassis and it be something else I should have checked first.

[grantspain]

you metered the horizontal output transistor from collector to heat sink then

[neofrank]

you metered the horizontal output transistor from collector to heat sink then

Edited Last post, I mis-spoke/typed/didnt know what I was talking about.....so no I haven't metered this, and I do not really know how to/where to. I have a meter and have used it in testing continuity and power issues on my older woody style cabs, so it was real clear where I should be metering and what I should be getting.

But I have basically NO monitor experience, the generic monitor flow chart I have seen tells me to "check the regulated power supply (B+) at the output of hte voltage regulator" Which I assume is what you are talking about also, I just dont know what I need to be doing

So thats why I was just going to discharge the monitor (I have done this before, and I am comfortable with the risks, etc.) and just send it to a company that works on this stuff, but I wanted to make sure I wasnt wasting my time if it was power supply or other than monitor part related.

btw this is a pic of the chassis:
http://i287.photobucket.com/albums/ll15 ... G_4008.jpg"

[grantspain]

yeah best to send for repair,you don´t want to make the problem worse

who will fix that for you in the states,i did not think anyone could fix those chassis stateside(except rick nieman)

the hot is the horizontal output transistor,its on the horizontal deflection circuit0it will be something like 2sc2455

[neofrank]

Thanks for the info, I will just send it down and see what they say....it was really hard to find someone to work on this chassis for me, plus information (schematics, flow charts, etc) seems few and far between, the company was recommended by Ken Westerfield, they are All Good Technical Services....though when I talked to them apparently they dont love working on the monitors in sega machines in particular, but they will see what they can do, and wont charge me if they cant work on it/fix it

But I will keep the boards posted if it works out and maybe it will be another avenue for people, especially in the states to get monitors worked on.

[Mellor]

Thats bloody good of them then, no charge if they can't do anything with it! I'd definitley go for that option!

[NipRing]

Any word yet? Did it get repaired?

[neofrank]

I just talked to them and they are working on it, apparently it has "multiple issues", I will provide as much detail as possible when I hear back again.

I hate when new acquisitions have problems I cant trouble shoot, cause I am getting the fever to buy another cab, though this one hasnt really gotten any play.

[grantspain]

multiple issues read for can´t repair it,whats the bet you end up with a nice new betson or billabs

[poolchamp]

multiple issues read for can´t repair it,whats the bet you end up with a nice new betson or billabs

True Grant but maybe they are doing a complete overhall or wanna get extra money for nothing ,That kinda covers them for everything . Oh forgot Good afternoon mt8

[grantspain]

multiple issues read for can´t repair it,whats the bet you end up with a nice new betson or billabs

True Grant but maybe they are doing a complete overhall or wanna get extra money for nothing ,That kinda covers them for everything . Oh forgot Good afternoon mt8

ay up Alan,glad to see you found the full stop and comma buttons on your keyboard at last

[poolchamp]

multiple issues read for can´t repair it,whats the bet you end up with a nice new betson or billabs

True Grant but maybe they are doing a complete overhall or wanna get extra money for nothing ,That kinda covers them for everything . Oh forgot Good afternoon mt8

ay up Alan,glad to see you found the full stop and comma buttons on your keyboard at last

Im not good with this Typeing thing man im So Sorry If is annoyed people

[markedkiller78]

I wouldn’t sweat it mate. I don't think that anyone is, but If they were actually getting annoyed with trivial stuff like that, then they really need to take a look at themselves.

I’m just glad to leech any tech knowledge I can that's the bit I totally suck at

[poolchamp]

I wouldn’t sweat it mate. I don't think that anyone is, but If they were actually getting annoyed with trivial stuff like that, then they really need to take a look at themselves.

I’m just glad to leech any tech knowledge I can that's the bit I totally suck at

IL give ya lesson's for that AWsd your selling me mt8

[grantspain]

it don't annoy me one bit,just having a giraffe with yer guv

[neofrank]

multiple issues read for can´t repair it,whats the bet you end up with a nice new betson or billabs

Hope this isnt the case, but we will see they were recommended by Ken Westerfield so I am giving them the benefit, and I really want my blast working.

[cools]

multiple issues read for can´t repair it,whats the bet you end up with a nice new betson or billabs

Hope this isnt the case, but we will see they were recommended by Ken Westerfield so I am giving them the benefit, and I really want my blast working.

I feel your pain. Ordyne's come back with bad news about my Windy II chassis too.