Freddy: Gott. sys. 3 GI and flashers dead.

shardian

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I'm just getting into this, and I'm wondering what is going on. All the GI and the solenoid controlled flashers/lamps are dead. All of the solenoid controlled lamps in the backbox were obviously blown and 'black glassed' over. The fuses are all good, and I continuity checked the NC relays - good.

I've seen talk on RGP about the large resistors in the flashers circuitry. I have not checked them out yet. The power on the backbox flashers are all tied through one of these large resistors. My question is this: What is the theory behind these resistors? I've never seen this on another pin.

Checking these resistors are next on my list, but I still have to figure out the GI.
 
I'm just getting into this, and I'm wondering what is going on. All the GI and the solenoid controlled flashers/lamps are dead. All of the solenoid controlled lamps in the backbox were obviously blown and 'black glassed' over. The fuses are all good, and I continuity checked the NC relays - good.

I've seen talk on RGP about the large resistors in the flashers circuitry. I have not checked them out yet. The power on the backbox flashers are all tied through one of these large resistors. My question is this: What is the theory behind these resistors? I've never seen this on another pin.

Checking these resistors are next on my list, but I still have to figure out the GI.

Just don't fall asleep while you are working on this one. I don't wanna lose you Shar.
 
R1, the biggie under the playfield reads as wide open. I always thought resistors failed as shorts...

The resistor on the back of the backbox light board reads as 3ohms. The resistor stripes are kind of confusing though. It appears to be red/orange/white...
I'll look through the schematics later.
 
Oh yeah, I forgot to add all those burnt to hell bulbs in the flasher slots of the backbox? They were all 555 bulbs... This is why flashers should always be a different base type than GI!!!
 
Oh yeah, I forgot to add all those burnt to hell bulbs in the flasher slots of the backbox? They were all 555 bulbs... This is why flashers should always be a different base type than GI!!!

I bet they looked really cool for the .5 seconds they were on :)
 
What is the theory behind these resistors? I've never seen this on another pin.

Williams also uses power resistor on their flashers. Older style Williams (a la Firepower) had the resisters on a tiny mount in the area of the flashers. By the era of system 11, small resistor boards were scattered all over the under side of the playfield....before moving things to the "auxiliary power driver" board.

Data East, from the get go, mounted all the flasher's power resistors on their own board...with some additional drivers....the "PPB" board.

...and do yoursefl a favor and use the correct flasher bulbs for Gottlieb system 3 pinballs. They use 904's for the wedge....and 67's for the bayonet. If you do this, you won't be replacing them all the time.

Edward
 
Dang it, I don't have the schematics for this pin - all I have is the manual. Does anyone know what ohms the one is on the backglass board?
 
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