Re: Trouble with WG6100

I've gotten several games where someone beforehand mixed the transistors
up. It's easy to assume that the transistors are in the right place.
When in doubt, check the schematics. Make sure the PNP transistors
aren't accidently swapped with the NPN transistors.

Matt

Walt wrote:

> Problems with a WG6100 - gee what else is new? I got a Tempest with a
> dead monitor a few weeks ago and got around to looking at it this past
> weekend. When I say dead - I mean dead - no power, no neck glow,
> nothing. I installed both a cap kit and an upgrade kit from Bob
> Roberts as well as a LV2000. I resolderd all the connectors also. I
> followed the instructions with the LV2000 and adjusted the voltages
> with all the connectors on the deflection board unplugged. Carefully
> plugged everything back in and fired the game up - the monitor had no
> signs of life - after about 10 seconds the fuses at F100 and F101
> blew. Got the troubleshooting flowchart out. I replaced the fuses and
> also had to replace the diodes at D102 and D103 - they fried when the
> fuses blew. I then unplugged the connectors at P100, P600, and P700
> and fired the monitor up - the LV2000's led's came on and the fuses
> didn't blow. Proceeded to hook P100 back up - no problems. Hooked
> P600 and P700 back up and *POOF* two more fuses down the drain. But
> it didn't take the diodes out this time. So at this point you say its
> the chassis transisitors. I replaced all of them and the mica
> insulators as well. They all got a liberal amount of heatsink goop
> too. I checked continuity to make sure they are not making contact
> with the chassis and double checked them using the diode test that
> Gregg Woodcock describes. All are good. Anybody ever have any
> problems with the kits from Bob Roberts?? Somebody said that the
> transisitors he includes in the upgrade kit for replacements at Q604
> and Q704 are the wrong ones. But I installed this exact same set-up
> in a monitor for a Black Widow with no problems. Anyone have any
> suggestions as to where to proceed from here? Should I replace the
> transisitors at Q603, Q703, Q604, and Q704? Wondering if they are the
> problem now. Thanks for the help. Walt

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Received on Wed Apr 5 13:58:59 2000