Re: Paging Team-EM...

On Nov 23, 12:46 am, "flippy" <rgp_fli...@xxxxxxxxxxx> wrote:

So where did you find it Tim ?

Yeah, that's a really good question if you don't work on Gottlieb
EMs. The armature switch is a special switch used on 60s Gottlieb EM
reset circuits. Unlike the rest of the switches in the main relay
bank, it's mounted on the underside of the bank frame, and it rides a
small round insulating disk attached to the metal armature (latching
plate) for the reset (aka bank reset) relay. When the reset coil
fires to trip the relay, the armature is pulled in, which allows this
switch to close. Once the relay is tripped, the switch stays closed
because the armature gets locked in place by the actuating arm of the
relay dropping into the tripped position. (Note: the acutating arm is
the bigger metal plate on the relay with the posts that operate all
the regualr relay switches).

The armature switch completes the circuit to the big reset solenoid on
the relay bank, which fires (via a switch on the score motor) to reset
all of the relays in the bank. The reason this switch is on the
armature is to ensure a solid pulse to the bank reset solenoid to
reliably re-latch all of the relays in the bank. If this switch were
in the regular relay switch stack, then when the bank reset solenoid
fired, the switch would open at some point while the reset bar was
still lifting the actuating arm for the reset relay, cutting off power
to the bank reset solenoid before the bar had lifted all the way up.
Since the armature doesn't snap back to its latching position until
the actuating arm is lifted high enough to latch, the switch stays
closed (and the bank reset solenoid stays powered) long enough to re-
latch all of the relays on the bank.

This switch is tricky because you can't even see it unless you rotate
the bank up out of its mounting brackets for service. Even then, it's
very hard to see the switch contacts because the reset bar is in the
way. And, the adjustment tolerance on this switch is very tight,
because the armature doesn't have much travel, so the difference
between the switch being closed or open is very small. Finally, the
reset bar can strike one of the switch blades while you are putting
the bank back into the mounting brackets, screwing up any adjustment
you carefully made while the bank was open. So it's definitely one of
the "gotchas" for servicing Gottlieb EM games of the 60s.

- TimMe (CARGPB3)

.

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