WG 942469 - trying to identify model

[Miketek]

Hi. So I got my hands on a Rampart 2 player system that is in working condition. Im looking for some assitance in indentifying the model of the monitor and any advice on sharpening the picture up a bit. This is my first arcade machine and I am a total newb when it comes to this stuff.. I did however wire the video back up using a pin-out diagram I found online. I have also spent a few hours browsing the monitor indentity sites and pictures and manuals.

Everything seems fine but the picture is slightly blurry. It is playable but you need to stand back a few feet to really make out most text.

Ive adjusted the focus and seem to have it in the best position.

There is a buzzing noise with static behind it coming from the area of the flyback.

The machine was a throw away and sat in a friends garage for the past two years. The monitor PCB is covered in dust and grime. I intend to move the unit back outside and blow it out with an air compressor.. without touching anything shocking of course.

The numbers I have found around the monitor are as follows:

Chassis # WG 942469

Tube: Mitsubishi A48JJY71X

Other side of Chassis:
Part No. 2900677602
ECC-20437
MAIN (4AR-1)
2950006124

And a few pics Ive taken for now including the uber grimey PCB:

[Miketek]

I took some more pics.

You can see the amount of grime thats built up.

The screen shot accurately shows the level of blurriness in the text, but the other artifacts arent visible except when taken with a cheap digital camera. 

The last two shots I took blindly by reaching the camera inside the chassis and photographing backwards.. my first view of what I think is the daughter board behind the neck of the tube..? Newb Alert! 

Ill also add that none of the caps look swollen or are leaking.

[SirPeale]

I'm thinking it's a K4900.  Hard to tell, need to see more of the chassis.

[modessitt]

Does have similarities to the K4900, but the neckboard is reminiscent of a K4500.

[Miketek]

Thanks for the replies.

Im not at home now but Ill take some more detailed pics of the chassis and neck etc and post them as soon as I can 

Cheers.

[modessitt]

It would be best to remove the chassis from the tube and take pics from full top, full front, and possibly each side.  It helps to see everything at once, and not such extreme close-ups.

[Miketek]

Ok Ill try and get some more detailed pics soon for sure, just a bit busy over this weekend..

And it also seems to be  bit less blurry now, maybe its clearing up slowly after being off for a number of years..

Also, can all that dust and grime on the PCB maybe cause some blurriness or the fouce sto not dial in properly? Maybe that doesnt make sense, but Ive cleaned out scratchy guitar pots before and had static disappear and also dirty switches on other electronics that Ive cleaned and cleared up various issues..

[SirPeale]

If it's not focused, have you tried adjusting the focus pot on the flyback?  It's the one on top.

[Miketek]

for the record, after about a month of occasional usage, its started focusing very nicely and the flyback has stopped crackling.

(thats after at least 3-4 years of sitting in my friends garage. )