Alien Poker
Williams, 1980
Black Knight
Williams, 1980
Blackout
Williams, 1980
Comet
Williams, 1985
Disco Fever
Williams, 1978
Firepower
Williams, 1980
Flash
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Gorgar
Williams, 1979You're currently viewing posts by Pinsider sndchaser.
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Quoted from matiou:Intermittent sound issues with my Firepower... I guess time has come to re-cap the sound board (see hole in cap on picture below!)... But... Won't be easy to desolder caps from this huge ground plane!
[quoted image]
That's a vent hole, so if the capacitor pops it does so from a controlled point rather than exploding all over the place.
Quoted from Danovh:Can you use the same zero ohm resisters that is linked in post#132? Those are 1/4 watt but the originals are 2 watt. I already have the 1/4 watt, just trying to use what I have.
Absolutely. Wattage on a zero ohm resistor is meaningless anyway, it's just the cosmetics of the package size.
Quoted from Danovh:I need to replace a 2n6122 NPN Power Transistor for my System 3 Driver Board, is this the Tip 41 that this is referring to, because I don't see Tip 41 on my schematic? There are 8 of these transistors that control the multiplexed lamps on the playfield.
Yes, for the lamp row drive some boards had 2N6122 as per the schematics, others had TIP41. Those 2 were/are interchangeable in those locations.
Quoted from CanadianPinball:WOW, just WOW!
I did the IRF9Z34N +0 Ohms resistors and the replacement went easy peasy!
Plug it in and while smiling at my soldering work, I see the IRF9Z34N are all backwards, FFS!
Any idea if I burnt any chips?
IIRC those are GDS so you installed it SDG so you probably didn't damage anything, not even the MOSFETs.
Quoted from Beatnik-Filmstar:No problem, of course.
Will just transfer that small ceramic cap over when recapping. Does seem curious to me that there's so many pictures of these sound boards that have been recapped but appear to no longer have the extra little cap. Wonder what purpose it really serves. If removing it caused much of an issue I assume there's be warnings about moving it over.
It's about frequency response. They are both there to stabilize the power rail. The larger electrolytic cap responds better to low frequency changes, either in the supply voltage or from increases in current draw from the subject board. The ceramic cap is capable of smoothing high frequency changes, either in the supply (i.e. from noise or EMI), or from any chips on the sound board that may create spurious noise through transistors switching on and off. Putting a ceramic cap in parallel with an electrolytic cap is a sound practice in any power rail decoupling application and putting the ceramic capacitor back (or adding it if not there already) will only serve to improve things.
Quoted from zacaj:I just use a hand pump solder sucker. Usually I can suck the solder from each pin, and then just wiggle the header a bit and pull it away in one piece
There are no trifurcon headers (male), so he must be talking about something else. But (card) edge connectors also don't use trifurcon contacts, so I've got no idea what the OP is talking about. Maybe clear it up with a picture?
Quoted from zacaj:Any of the 0.156 can be Trifurcon
Only female contacts, not the male headers.
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Shepherdsville, KY