Bally 1133 Golden Gate Burnt Diode/Resistor Issue

[BrettH]

Hi Guys,
Looking for some info on what diode or resistor has burnt out on this Bally 1133 Golden Gate. (Aus 10c Model)

It lies between the delay relay coil and the delay relay switch located in the bottom front of the coin hopper. It is pretty burnt up so it is hard to recognize exactly what it is.

Have had no luck finding a wiring diagram/schematic, though found it mentioned in the “introduction to Bally Machines manual” which I screen shot and added to the pics below.

Has anyone got this machine or a similar one that could take a photo of the resistor/diode for me to reference or know what it’s called so I can find one.
Have had a suggestion from one source that it is a 47ohm 1w resistor and a 1N4007 diode. Would there be one of each connected in line like the picture I posted or just say one resistor.

Any help would be much appreciated!
Cheers Brett

[wolftalk]

the delay relay circuit is pretty standard and is like the page you posted.  You can see an example with the component values by looking at the 1127 schematic in https://bingo.cdyn.com/slots/1127/

note that a 1N4007 (or  any 1N400x, where x > 3) is interchangeable with the 1N2070 called out on that schematic.  Both are generic silicon rectifier diodes, and the 1N4007 is actually a bit beefier.  Eventually bally switched to 1N400x diodes from the 1N2070's.

47 ohm 1W is correct for the resistor.

I'd replace the capacitor and check the relay coil.  The most likely reason for the diode/resistor to burn up is the cap failed/shorted. 

[BrettH]

Thanks for your reply and info wolftalk, I have the resistor and diode ready to solder in though the machine has not had any dramas running without them as yet. Makes me wonder how necessary they really are??? Would the machine continue to operate just fine if I never fixed it? haha
Much appreciated for help, Cheers

[Trisail]

Put them in. The diode is a protection device- to stop voltage going back to the driver when the solenoid turns off. The resistor is a current limiting device- for the solenoid and driver circuit. (Simplest explanation)

[wolftalk]

Put them in. The diode is a protection device- to stop voltage going back to the driver when the solenoid turns off. The resistor is a current limiting device- for the solenoid and driver circuit. (Simplest explanation)

in this case, the diode is half-wave rectifying the AC current ... chopping off the negative half of the cycle so the capacitor will charge. 

with the diode and/or resistor out, the delay relay will never power and the game normally would shut down within a few seconds of a payout starting.  If it's not doing that, then someone probably disabled the safety timer motor or the safety timer switch.

you probably don't care if a problem causes runaway payout (game doesn't stop paying), so you don't need to fix the circuit.  The casino was a bit more concerned about a cherry win dumping out the entire contents of the hopper :-)

if you do want to put the resistor and diode back in, you'll want to figure out why the safety motor wasn't turning off the game and fix that first just to make sure someone didn't make a change that would cause the diode or cap to blow up.

[BrettH]

The little arm off the ratchet cam micro switch has been removed. That would be why it dosnt shut down with that circuit burnt out? I’d say the last owner pulled it off for a quick fix.
 I have run the machine through a couple of 100 and 200 coin payouts and it stops correctly. Might just put this job on the back burner for now and if it ever runs away I’ll sort it then.
Thanks again for the help guys 👌👌👌

[wolftalk]

the circuit is designed so:

1] if the delay relay doesn't power, the safety motor runs when the hopper motor does and the game shuts down in a few seconds

2] if the delay relay does power, the safety motor runs when the microswitch is closed.

removing the microswitch lever would keep the switch open, but you still need to power the delay relay, strap down the armature plate, misadjust the switches or rewire the thing to prevent the hopper motor power from reaching the safety motor.

the safety motor resets when power to it is interrupted.  The diode allows the capacitor to charge, and the capacitor charge keeps the delay relay powered while the microswitch is open ... that allows the safety motor to spin back to reset then starts winding up again when the microswitch closes.

replacing the cap, diode and microswitch lever is still not enough to make the circuit work as intended.  Somehow the safety motor is disabled or unpowered or the delay relay is being powered (or acting like it is).