William,
Thanks for the tips. I've order some parts and they should be here first thing next week. I'll replace the caps and
the diodes and see what happens. Worse that can happen is the monitor will have all new parts :)
Hopefully it's not a bad tube like Colin said it might be. If that were the case, can the tube be rejuvenated or would
I have to find a donor Tube? I wonder how hard that would be, probably not an easy task...
-- Brien King spammehere@arcaderestoration.com Visit the Arcade Restoration Workshop @ http://www.arcaderestoration.com Home of Cart Commander, the Ultimate Cartridge Cataloging Utility! Thursday, February 9, 2012, 7:29:41 PM, you wrote: > Replace C510. > I've been staring at the schematic for a 1/2 hour and it doesn't make sense > that the spot killer LED is on but you have a picture. That means that the > problem is likely intermittent (repeating at some frequency too fast for the > eye to see). If C510 is losing its ability to provide the proper time delay > for the SK circuit, then maybe the LED is not really on all the time, but > just partially or flashing fast enough to look like it's solid on. > Similarly, Q503 may be misbehaving due to the bad C510. Who knows, maybe > it's causing the center dot. A scope trace from D506 cathode would likely > reveal much. > I recommend also, since you are going to be in there anyway, replace C508 > and C509 since they are the same type and age. If C510 has failed, then you > might as well hit them all. Also, the diodes D504, D505, D506 (1N914 or > 1N4148) might as well be replaced. They are super cheap and easy to replace > so you might as well change them just to be 100% sure that they are all > switching properly and not leaking or something. A shorted D505 would cause > strange things to happen. > William Boucher > http://www.biltronix.com > ----- Original Message ----- > From: "Brien King" <spammehere@arcaderestoration.com> > To: <vectorlist@vectorlist.org> > Sent: Thursday, February 09, 2012 11:18 AM > Subject: VECTOR: Asteroids G05-801. Perfect picture for 5 mins then a circle > appears in the middle of the screen. >> Ok, I have an Asteroids with a G05-801 in it. When the game is first >> turned on, the picture is perfect. >> >> However, the Spot Killer is on, and after about 5 minutes, a circle and >> dot show up in the center of the screen. >> >> http://www.arcaderestoration.com/graphics/repair/AsteroidsCircleInMiddle.jpg >> >> I capped the monitor and here is what has been replaced so far in the Spot >> Killer section: >> >> Q503 >> Q506 >> R518 >> R528 >> R529 >> R523 >> R524 >> >> >> Any help would be greatly appreciated! >> >> >> -- >> Brien King >> spammehere@arcaderestoration.com >> Visit the Arcade Restoration Workshop @ http://www.arcaderestoration.com >> Home of Cart Commander, the Ultimate Cartridge Cataloging Utility! >> >> --------------------------------------------------------------------------- >> ** Unsubscribe, subscribe, or view the archives at >> http://www.vectorlist.org >> ** Please direct other questions, comments, or problems to >> chris@westnet.com > --------------------------------------------------------------------------- > ** Unsubscribe, subscribe, or view the archives at http://www.vectorlist.org > ** Please direct other questions, comments, or problems to chris@westnet.com --------------------------------------------------------------------------- ** Unsubscribe, subscribe, or view the archives at http://www.vectorlist.org ** Please direct other questions, comments, or problems to chris@westnet.comReceived on Sat Feb 11 02:00:11 2012
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