Re: Tech: Black Hole - my first Pin!

On 24 Mar, 11:10, Steve Charland <ccharl...@xxxxxxxxxxx> wrote:
Hi Joe,
Don't connect that red-red-red wire to those jumpered wires, Nick may
be right and it is for a pull up resistor and not involved in the switch
matrix. To be sure, follow that slate-brown-brown wire to where ever it
goes, if it goes to a drive transistor, you need to get that diode out
of there and a 4.7k ohm 1/4 watt flameproof resistor back in (if it
should be a resistor, you might have a different problem to look at here
since this resistor shouldn't look "burnt" in the first place).
As far as the other problem in your game, look for an easy solution
first. I'd look at the switch in the capture hole as the cause. The gap
may be too close and making connection too easy by vibration. This would
make the game think it captured the ball and eject another while turning
off the lower playfield. Try putting the game into switch test 18 and
bang on the lower playfield with your hand. The game may tell you what's
wrong with it.

Steve
System 80, not just a job, it's an adventure



kcmoe...@xxxxxxxxxxx wrote:

I suspect as most always say around here about the sys80 games is
connectors, and I plan to order and replace connectors and pins very
soon, but I thought first I would check the switch matrixes with a
multi-meter and see if I have any bad diodes that might be causing
some wierd confusion sending signals back to the CPU. A-Ha!- I found
one at the top of the strip that visually looked burnt compared to the
others and when I checked it I got nothing on the reading.
The other diodes were giving the reading of 0 V in one direction the
other 0.2 V.

I saw that I could probably get a 1N4148 at Radio Shack that would
work replacing the original 1N270 diode, so I soldered one on and
checked it and was getting 0 V and the other way 0.5 V. Now I was
thinking maybe that was it causing my issue, well its didn't fix it,
still does the same thing. I opened it back up just to recheck the
diodes and now it's giving a reading of 0.1 V the direction that had 0
V before, and nothing the other way. On closer inspection of this
strip of diodes (picture link below) it looks like a metal wire runs
up threw the solder joints of each diode connecting them in a row,
except mine doesn't connect to the very top diode (the one I
replaced). I now wonder if this is why my reading is strange now, and
maybe I broke it off during soldering the new diode. ?- Hide quoted text -

- Show quoted text -

Thanks guys! man I feel like an idiot now, so I went back a looked at
the one I took off from this top bank, and indeed it is a resistor and
not a diode and it just had some dirt on it, but even behind it on the
small brown board it looked kinda charred compared to the others, so I
am putting back in the resistor here (hope I didn't screw up
something) and Steve, yes that brown wire on the left goes to a
transistor mounted to the left.

I'll report back after I try Steve's suggestion with the test, I had a
hunch that it might be the vibration setting off the switch too, but
the contacts on the switch look like there is slightly more of a gap
then the capture hole on the top playfield.






.

Relevant Pages

  • Re: TECH: TZ buy in button not working
    ... I doubt you got the diode backwards unless you removed it completely. ... On mine the banded side of the diode is connected to the wire - the ... Does the switch light in the "all lamps" test? ... >>> Connectors seem to be connected correctly, ...
    (rec.games.pinball)
  • Re: Addams Family Question
    ... But I don't see the buy in lamp in the lamp matrix. ... The Buy-In button contains a push-button switch and a lamp. ... A diode will be added in-line with the switch on the white/brown wire. ... A diode will also be added in-line with the lamp on the red/brown wire. ...
    (rec.games.pinball)
  • Re: Main Jurassic Park switchis broken, what to do
    ... move the actuator over to a new switch. ... diode from shaking loose all the time. ... replace the green 22awg wire that connects between this switch and the ... got a 3 position molex .062 connector and crimped ...
    (rec.games.pinball)
  • Re: 12V regulator
    ... 1N4004 or higher rated diode, ... so he's just going to spring for the neon switch. ... would putting the diode in reverse across the switch terminals not ... And don't forget the series resistor! ...
    (sci.electronics.design)
  • Re: Tech: Black Hole - my first Pin!
    ... Don't connect that red-red-red wire to those jumpered wires, ... be right and it is for a pull up resistor and not involved in the switch ... goes, if it goes to a drive transistor, you need to get that diode out ... I'd look at the switch in the capture hole as the cause. ...
    (rec.games.pinball)