wg u5000 with no red? Fixed!!!!

[gatordad]

I just just received a good condition 25 inch wg u5000 dual res monitor, however after putting it through it paces there is no red, I have tried all of the adjustment on the neck board but still I am missing red.

Any troubleshooting advice.

I have a 25 inch polo 1 tube laying around, would I hurt anything if I swap the tube out and see if red is still missing or is this most likely a cap issue on the chassis?

[grantspain]

u5000 suffer from bad solder joints and bad drive transistors on the neck card
pretty sure the u5000 had a 0.600mh yoke so if you connect your polo tube you will fry the horizontal output stage

[SirPeale]

Try swapping color transistors first.  U5000 (and the others that use that neckboard) are notorious for eating them.  Usually green, but any color is game.

[gatordad]

A few more questions

I am new to reading schematics  can someone help me before I order parts. Is the circled part a Q505 like I think it is?
I will be testing the tube hopefully sometime this week.

I had some time today to look everything over really well and I am completely missing this part, would this have been removed for any of the 3 upgrade kits available for this monitor, and for that matter how can I tell if the upgrade kits have been installed or not?
What do I look for?

Thanks

[SirPeale]

Q505 is the schematic reference.  The transistor part number will be noted either in the schematics in the parts list, or on the transistor itself.

[gatordad]

Ok I have the part # for the transistor (its npn sanyo 2sc3782)  but what is the part number for the (It looks like a heat sink that surrounds it)?

and how do I know if the upgrade kits have been installed or not?

[SirPeale]

Just reuse the old heat sink.

[gatordad]

Just reuse the old heat sink.

I don't have it, its missing altogether.

[SirPeale]

Gotcha.  Wells Gardner would have them.  But any small filled heat sink would do the job as long as you can attach it securely.

[gatordad]

I made a few calls to local arcade shops in the area, and found one that had the transistor and heat sink, I picked them up on my way home from work ( I even bought an extra just in case) 5 minute solder job, fired her up and I now have red, I spent about 5 minutes adjusting thing and now have a beautiful picture, I have to splice the power as the cab it's going into has a different connector for power.

Many thanks as if weren't for the helpful direction provided here I would not have know where to start looking.
What a good feeling...... my first solder job...... and monitor repair.
Now I want to cap something with my newly learned skills.