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(Topic ID: 271729)

EM terminology

By undrdog

3 years ago



Topic Stats

  • 5 posts
  • 5 Pinsiders participating
  • Latest reply 3 years ago by KenLayton
  • No one calls this topic a favorite

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#1 3 years ago
OP
 
MYK

undrdog

Pinside+ Addict

4y 99,050 3,220 9

I'm getting familiar with my first EM. 1964 Williams Heat Wave

A lot of the relay labels seem generic, and I'd appreciate some help learning what it all means.

If there is already a primer on this, please let me know the link.

What do these do / mean ?

Lock Relay (bottom of cabinet)
Left (and right) target Lock Relay (under play field)
Reset Relay
Coin Relay vs. 25c Relay
change relay

I could also use some help knowing how to track down a switch that I can find on the schematic, but in reality could be anywhere inside the cabinet.

mike

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#2 3 years ago
 
HOW

HowardR

Pinside member

US Boulder, CO

7y 78,050 6,259

Lock Relay (bottom of cabinet) stays energized almost all the time so if somebody turns the game off and on it will go to game over
Left (and right) target Lock Relay (under play field) Hard to say without the schematic
Reset Relay gets the game ready to play when you push the start button on the front
Coin Relay vs. 25c Relay. Can't be sure without the schematic, but the coin relay may be part of the reset circuit and the 25c relay may add credits
Change relay Can't be sure without the schematic, but may alternate on & off to control alternating game features.

OP
Quoted from undrdog:

I could also use some help knowing how to track down a switch that I can find on the schematic, but in reality could be anywhere inside the cabinet.

The word(s) by the switch tell what relay the switch is on. Use wire colors to find which switch on the relay.

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#3 3 years ago
 
WEN

jrpinball

Pinside+ Addict

10y 115K 10,722

Quoted from HowardR:

Change relay Can't be sure without the schematic, but may alternate on & off to control alternating game features.

Yes. Williams' terminology for "alternating relay" is "change relay".

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#4 3 years ago
 
???

currieddog

Pinside member

US Springfield, MA

7y 63,550 3,312 6

OP
Quoted from undrdog:

If there is already a primer on this, please let me know the link.

Here is a superb site to bookmark: http://www.pinrepair.com/em/index1

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#5 3 years ago
 
???

KenLayton

In Memoriam

US Olympia, WA

12y 83,400 5,965

Coin relay = 10 cent relay. Automatically starts a game when the dime coin switch is tripped.

25 cent relay adds the apropriate amount of credits when the quarter coin switch is tripped. This relay does not start a game, just adds credits. It is affected by the 25 cent adjustment jack as to the amount of credits added.

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