Re: Tech: Black Hole - my first Pin!

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

kcmoejoe@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. ?
.

Relevant Pages

  • 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. ...
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