A few WG6100 tips and tricks

Just got done fixing several 6100's this week... and here's a few tips for everyone.

1. Don't use NTE 10 watt 1.5 ohm resistors. You need audio grade or non inductive ones. One of these was on a board I got in and it was making wavy lines on the bottom half of the screen after all else was repaired.

2. Replace ZD902 with 2 75v 1 watt zener diodes end to end. (Positive of one to negative of the other.) This will make a teepee sticking out of your board... But, guess what, NTE 150v one watt zener is several dollars. My fix will cost you under $.25 and last forever. The NTE part WILL fail. This fix was told to me by Rick Schieve. I can't take the credit.

3. Use MPSU57 and MPSU07's in place of the MPSA56 and MPSA06 (respectively) in the LV section. I HIGHLY recommend using the CEN-U07 and CEN-U57 parts. They hold up just excellent - much better than the uniwatt packages! If you do this, again, the LV section will be bullet proof. This fix will cost you just a few $$$. The other upside of this is that when a deflection transistor fails and begins to draw too much current through the LV section, it will only blow the 15 ohm resistor. If you have an LV2k in there, I hope you have surface mount soldering equipment. If you order the transistors from me, I will throw in some free 15 ohm resistors, if you ask.

4. Run your game a little bit smaller than full screen. By doing this, the deflection transistors won't need to work as hard. This means less heat and longer life.

If you have anything to add, please do.

JB

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