Re: Need help understanding an EM schematic

On May 18, 11:36 am, kbert <kbern...@xxxxxxx> wrote:
On May 18, 10:20 am, Jerry <jerr...@xxxxxxxxx> wrote:



On the schematic for a Gottlieb Big Brave, 1974, around location I-11,
there is a make/break SB1 relay switch, which interrupts the 25V power
circuit to the whole top half of the schematic:

|
=     (open switch)
|     SB1
=/    (closed switch)
|
|
25V

One of these switches is always open.  The 25V line running down the
entire right side of the schematic is cut in half by these.  How do
the flippers, bumpers. etc. etc. get any power?  Is there an omission
from the schematic, or am I just missing something?

Thanks.

The schematic shows the current state of the switches in what I
believe is the off mode (Game is not turned on).  Those switches that
are open will get closed when that relay fires and vice versa.  The
relay is referenced on a schematic as a coiled wire like this:  --()()
()--  Usually the only relays that cut the power to the bumpers and
flippers are the 'Game Over', 'Reset' and 'Tilt' relays.  I'm not sure
what the 'SB1' relay is on your machine.  So, when you start a game,
that switch will get closed by that relay and provide power to the
flippers and bumpers.

Hope this helps.

Thanks for the reply. I think my diagram wasn't clear enough. The
SB1 relay has a make/break pair. One switch from the pair is open and
the other one is closed. If the coil is energized, the open/close
state will be reversed, but one of them will still be open. In my
diagram, the two switches I depicted with = signs are the two SB1
switches. The schematic depicts an arrow pointing to both, denoting
their linked status:

= <---+
| | SB1
= <---+

(one of those switches has a line through it on the schematic). It
seems to me that one of those switches is always open, regardless of
the state of the coil.

If this still isn't clear, I'll link a photo of that part of the
schematic when I get home tonight.

Btw, I don't have the schematic with me, but I think SB1 is a reset
control relay.

-Jerry
.

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