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(Topic ID: 251071)

Gottlieb Gladiators power problems - Starting with bridge rec values?


By Impzilla

1 year ago



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  • 20 posts
  • 6 Pinsiders participating
  • Latest reply 9 months ago by Impzilla
  • Topic is favorited by 1 Pinsider

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#1 1 year ago

My project Gladiators has some potential power issues due to some plugs getting moved around before I acquired it.

Checking the three bridge rectifiers:
The 48vdc bridge rectifier has 50vac in but the output is 65vdc, much higher than the 48vdc the schematic states.
Does this sound about right ?
If this indicates a defective bridge, whats the replacement part? I do not see any part numbers in the manual.

12vdc and 20vdc bridge rec matches schematic values.

I would like to confirm all other power values before getting into what boards got damaged due to the cables being swapped. This is the first machine of this generation I have owned and it looks like it has a lot of different voltages running everything.
Is there a single document that has all the power values and checkpoints ?

Thanks for any info.

#3 1 year ago
Quoted from Benhurr:

110VAC you might put the jumper for upper voltage and put the 120VAC jumper.

The 120v jumper is in, I have 116 coming in.
With 50VAC confirmed coming into the Bridge rec I would assume I would get the 48vdc out, but I am not.

#5 1 year ago
Quoted from Benhurr:

Rectifier bridge might to be change

I do not see a part number on this bridge, is there a spec or commonly used bridge I can replace with ?
Thx.

#9 1 year ago
Quoted from Benhurr:

Those 3 Bridges rectifier are same

Since they are all three the same but one has out of spec output voltages, that one will be replaced.

Quoted from Pin_Guy:

The most commonly used replacement Bridge Rectifier used in pinball is the KPC3504

Found this part number and ordered for replacement.

I will update after the new bridge is installed.
Thanks,

#12 1 year ago
Quoted from Pin_Guy:

Full part number KBPC3504W (wire leads) or KBPC3504W (terminal leads)

Quoted from G-P-E:

Or GBPC3504, GBPC3504W

I have KBPC3504 coming in a few days.

#14 1 year ago
Quoted from Pin_Guy:

Hope you ordered the KBPC3504T version

The one I ordered has the tabs for the cables to connect to.
Thanks for the double check.

tab (resized).JPG
3 months later
#18 9 months ago

I replace the bridge - same values.
Got my hands on a donor transformer module - same values.

Since most of the head is unplugged:
My guess is, if the bridge does not have any load on it then the values will read high.

All I have plugged in at the head is the 5vdc supply.

boy141 - are any of the main boards connected in your unit? No load on bridge ?
Thx.

#20 9 months ago
Quoted from boy141:

replacing all the bridges

I would be interested in the voltage out after new bridge and cap.
Thx.

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