This Switch On The Rear Of My Cab ....

[Vicious Burger]

I have a Taito cabinet and it has this switch on the back .....,


which when pressed resets power. I assume therefore it is just a reset switch. Although the way it is installed,the button is held in when the back panel is on the cab. When i got the cab it was positioned slightly differently so the panel would not touch it,but in this pic it i put it in the position that matches the screw holes,so it must have been in this position at some point for the screwholes to be like that. Why would someone have it in this position

Only thing i can think of is that there is meant to be a hole in the rear panel where it can poke through and be pressed without removing the rear panel. There is no hole there now

[Thenasty]

That switch (it's called, Interlock Switch) is to shut machine off when the back door comes off. If you need to work on the cab with the door off, you need to PULL that switch to stay on.

[RayB]

To elaborate even more, that switch cuts or allows power to the entire machine.
Ops would turn them to face down because after a while, with a loose back door, the switch doesn't always stay pressed in, so the machine would turn off.

[TOK]

These are the number 1 cause of getting a perfectly working cab for next to nothing. 

[Vicious Burger]

That switch (it's called, Interlock Switch) is to shut machine off when the back door comes off. If you need to work on the cab with the door off, you need to PULL that switch to stay on.

If thats  the case,this one must be the other way round because the power cuts out when the button is pressed and held in. When you take your finger off it,it springs back out and the power comes back on,which I thought was weird because that means power would be cut off when the rear panel is installed holding the button in !!

[thecheat]

It's probably broken. Your original post did mention that it was relocated so that it wouldn't be pushed by the back door.

Looks like you would just connect red-red and blue-blue but double-check that with a meter first!

[SirPeale]

Yes, it sounds like your switch is broken.  You can:

1) replace it, or

2) rewire it.

[Kevin Mullins]

Sounds like the connectors are on the wrong tabs.
Like wiring a button to N.C. instead of N.O.
Notice how the same color wires are on the same side of the switch, just doesn't seem right, but I'd have to go fine a machine with that same switch in. Notice it doesn't have the "finger grip" groove in it like most interlock switches do. So it may not even be a three position type.
I've seen these used in Williams cabs by the coin door for memory protect, etc.

So I'm betting it was getting flaky because the back door wouldn't hold it in enough or they got tired of having to rig it somehow in order to keep it on when the backdoor was because it doesn't have the pullout type. Then the operator or technician moved it's position and also changed the wiring around to keep it permanently ON.

So a quick question to the OP would be.... does that switch have THREE positions?
PUSH in - CENTER - PULL out

[Vicious Burger]

Sounds like the connectors are on the wrong tabs.
Like wiring a button to N.C. instead of N.O.
Notice how the same color wires are on the same side of the switch, just doesn't seem right, but I'd have to go fine a machine with that same switch in. Notice it doesn't have the "finger grip" groove in it like most interlock switches do. So it may not even be a three position type.
I've seen these used in Williams cabs by the coin door for memory protect, etc.

So I'm betting it was getting flaky because the back door wouldn't hold it in enough or they got tired of having to rig it somehow in order to keep it on when the backdoor was because it doesn't have the pullout type. Then the operator or technician moved it's position and also changed the wiring around to keep it permanently ON.

So a quick question to the OP would be.... does that switch have THREE positions?
PUSH in - CENTER - PULL out

I don't think so,it only seems to do 1 action. You push and hold (power goes off) and let go it comes back on
There are 2 banks of 3 connections on the back. The wires are presently connected to the outermost 2 on each bank.
It makes sense what you said about it having been rewired. I guess i don't really need to use the switch in a MAME environment anyway. There is an on/off switch on the top of the cab,so i'd probably just let the rear switch dangle as it was when i got the cab.(I only screwed it back into the holes for the purpose of showing where it fits)

[Kevin Mullins]

I don't think so,it only seems to do 1 action. You push and hold (power goes off) and let go it comes back on

Yeah, that's what I thought.

There are 2 banks of 3 connections on the back. The wires are presently connected to the outermost 2 on each bank.

Wired that way keeps the switch in ON when NOT pressed.

If you were to move the two outer most wires to the appropriate inner most tab, then you would have to press the button to turn the machine on. (i.e. put the back door on)

Think of the middle tab as the "Common".
The outer most tab would be "Normally Closed" (always on, off when button pushed)
The inner most tab would be "Normally Open" (always off, on when button is pushed)

[Kevin Mullins]

Here's a similar switch that someone may want to look at the markings you typically find on switches like this.

Note how the outer most two tabs have a small line connecting them. (Normally Closed)
Note that the inner most tab has no line going to it. (Normally Open)

[Vicious Burger]

I don't think so,it only seems to do 1 action. You push and hold (power goes off) and let go it comes back on

Yeah, that's what I thought.

There are 2 banks of 3 connections on the back. The wires are presently connected to the outermost 2 on each bank.

Wired that way keeps the switch in ON when NOT pressed.

If you were to move the two outer most wires to the appropriate inner most tab, then you would have to press the button to turn the machine on. (i.e. put the back door on)

Think of the middle tab as the "Common".
The outer most tab would be "Normally Closed" (always on, off when button pushed)
The inner most tab would be "Normally Open" (always off, on when button is pushed)

right. I'll try swapping those around just to see what happens.I'll probably end up leaving it as is though,because i don't think i have the need to have the need to power the cab off with the back door open since i'm only going to have a PC in there anyway !

(By the way,for any purists out there reading this,I know what some people think of MAME conversions,so I can tell you I'm not butchering a perfectly good working Pacman cab. it had already been converted to another game and all the artwork had been destroyed by whoever it was painting this horrible black gunk all over it. If anything it'll look nicer once i've finished it ! I'm not going to throw away the parts i took out,more likely donate to a worthy collector who can make use of them and keep them going.)