Star Wars Deflection board

[mcbear]

Hi,
I've got a Star Wars with a dead screen that I'm attempting to get back up and running. The first problem (blowing f100 and f101) seems to have been fixed by replacing the LV2K board, which was badly soldered in.

Now the fuses hold but the Spot Killer instantly lights.

I've bought the Wells Gardner K6100 repair kits from Arcade Shop, and I'm about to start replacing the parts, but I have a small question...

I've taken the deflection board out, and underneath there are two transistors hanging down from C802 and C803. They don't look to be original.

Are these normal?

Thanks for any help!

 

[ckong]

This can be an interesting topic for me, as I am also in the process of getting two WG 6100's up and running again (for BW and Tempest).

anyway, to get back to your question, no that isn't normal/original. Could you post a picture?

BTW, there can be more reasons why the spotkiller led is on, you should first do some testing/measuring before replacing parts. For instance, did you check the video b+ voltage? Should be 180V DC. And are other voltages OK? Solder joints OK? No solder bridges? Maybe you already checked all of this.
ckong2015-07-19 16:37:56

 

[mcbear]

Hi, thanks for the help!

Here's some photos of the top and underneath…

So far I've checked the voltages, tested and replaced chassis transistors and scratched my head a fair bit. This is a massive learning curve!

 

[ckong]

That's odd. I did do alot of reading the last days about all kinds of possible mods and enhancements for the not-so-well-build WG6100 defelction board, but I didn't come across this one.

Maybe the original C802 and C803 capacitors are dead or have gone out of range and a previous owner didn't know how to replace them properly, so just placed new ones on the bottom side?

I would desolder them, measure the original ones and if they are indeed not good anymore, replace them in a proper way. BTW, you can find a lot of reading material and interesting forum topics about the WG6100 on the internet, with many tips and possible causes for errors.

All measured voltages are OK then?

You say that you replaced the chassis transistors, which types did you replace the 2N3792 PNP and 2N2716 NPN with? I'm asking because faulty or wrong chassis transistors can cause the spot killer led kick in.

Oh, and a simple, but very recommended upgrade, is installing the LV2000 (light), if it isn't already doen. This will replace the LV section of the board with much better parts.
ckong2015-07-19 19:30:07