Re: Need help understanding an EM schematic

On May 19, 2:42 pm, seymour-shabow <seymour.sha...@xxxxxxxxx> wrote:
Jerry wrote:

The motor still mystifies me.  I understand what switches correspond
to the different positions, but can't make heads or tails of the
sequence chart.  I mean yeah, wherever there's a black bar, it means
the switches at that motor position will be activated when the motor
reaches that rotation, but I have no idea how to relate different
lines in the chart to actual events.  And what's that picture of the
part with the "S" and the "L" on it?
That's the score motor, the S and L refer to short and long positions on
the switch followers - they tweak the timing as the switches pass the
cams on the score motor (don't change these!!!  They're a pain in the
ass to keep in place while you're tightening the switch stack.)

Ummm, nope, not visualizing this.

Say you have some feature of the game that has to be triggered slightly
before or after some other feature that's all activated at the same cam.
  Put a S or L flag on it, it will activate very slightly before or
after. I think they used it when they built the machine and had all the
circuits wired and found out some questionable behavior from a sequence,
they couldn't rewire so they change the timing slightly.

I still don't get what the use is of the drawing of the metal plate?
with an S And an L on it. It's not connected to anything, doesn't
indicate which switches use L and which use S.


Think of an old time cash register, you punch numbers into it and then
have to pull the handle to 'do' the work of adding them.  The punching
the #'s part is the relays, and the pulling the handle is the motor
turning.  There's a ton of circuits on the score motor, but only certain
ones do anything each cycle depending on what relays are activate when
the score motor runs.

I understand the theory.  It's just hard to see a line in the sequence
chart, 2B, say, and figure out what the activated relays are that will
be triggered by the motor switches at that position.

They're printed on theschematic- the switches all have the relay
they're attached to printed next to them, so if you have an R next to a
switch that means it's on the R relay frame, you have to have a complete
circuit from left to right for the relays to trip.  In some cases that
means R has to be in for instance so the circuit is complete - for
example all the scoring relays depend on the tilt relay not being in
tilt mode, so the tilt relay has to be non-tilted for the score relay to
pull in and work.

I spent a few hours last night poring over the schematic and have a
somewhat better understanding now. For example, one motor switch
position is responsible for stopping motor movement and deactivating a
few other sub-circuits. Another is responsible for triggering five
100 (or 1000) add point sequences. That's the kind of info that would
have been useful to be printed on each line of the sequence diagram.
But perhaps that's not useful for field techs doing troubleshooting.

During my perusal I came across a new area of lack of understanding.
There's something called the "player unit". It exists inside the
head, and it looks like a series of 5 cams attached to 5 switch
banks. I believe the switch banks are represented on the schematic by
notations such as P1A, P2B, P3A, etc, where the number is which switch
bank. However, I could not find any indication on the diagram of what
activates the switches. There's a solenoid for moving the cam shaft,
but no way to tell the sequencing of the switches (that I saw). I
_think_ the player unit is used for setting up the game when one
player's turn is over and another's is beginning. But it would be
nice to know the sequence of things it does.

-Jerry
.

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