Re: VECTOR: WG K6100 Troubleshooting
Chris Loggans <[email protected]>
| Newsgroups | gmane.games.arcade.vector |
|---|---|
| Message-ID | <[email protected]> |
> Yes. That is what they are there for. They are > called Nodal Voltages. OK, then here's my problem (the long version). I've got a K6100 that came to me with both of the chassis mounted low voltage transistors blown (one open, one shorted). I replaced the transistors, installed an LV2000 and did a quick check of all other transistors and everything appeared to be fine. I powered it up with no signal and it seemed to be running OK. I hooked up the boards, fired up the game and within a minute or so, the chassis mounted Y transistors (Q60x) were HOT and the low voltage transistors were out again. I replaced all of the transistors again, did a detailed once over of the Y section and all transistors, resistors and diodes checked out fine. This time I powered it up with no signal and started comparing voltages to those on the schematic. The one that was causing me concern is the voltage coming out of the U57 (Q603 I think, I don't have my schematics handy) going into the base of the 3716. According to the schematics, this should be 0.3v with no signal. I'm getting 0.004 (essentially nothing). Both of the input voltages to Q603 are correct and the U57 has been replaced with no change. I'm also seeing 0.75v instead of 0.6v at the base of the 3792, so I'm not sure if that is a cause or an effect of the first issue. Like I said before, nothing tests bad, so I'm a little stumped at the moment. Any thoughts? Thanks, -Chris