Gottlieb Gladiators power problems - Starting with bridge rec values?

Impzilla

Pinside member

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.

#2 4 years ago

BEN

Benhurr

Inactive member

Got the same problem with upper DC volts than it shows on the schematic so I look at jumpers and it was on 200 volts but got 230volts at my power receptacle...so I put the 240 volts jumper and the Vdc downs at the right power like on the schematic...you might take volts at your power receptacle and if you got 110VAC you might put the jumper for upper voltage and put the 120VAC jumper.
Jumpers are in a sealed bag fixe to the cabinet on the right of the transformator.
Sorry for my bad English and hope that could help you

Screenshot_20190909-221428_Drive (resized).jpg

Screenshot_20190909-221507_Drive (resized).jpg

Screenshot_20190909-221545_Drive (resized).jpg

20190909_223206 (resized).jpg

#3 4 years ago

Impzilla

Pinside member

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.

#4 4 years ago

BEN

Benhurr

Inactive member

Rectifier bridge might to be change...in the schematic it is wright that electronic component got a 10 years old life long. I also change it all.

#5 4 years ago

Impzilla

Pinside member

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.

#6 4 years ago

BEN

Benhurr

Inactive member

Those 3 Bridges rectifier are same, and their references are only the Volt coming in...10Vac 16Vac and 50Vac. You also better change C1 and C2. As you can see on the pictures, wires are only plug on them by a pod but I've seen a video from TNT Amusement that preconised to cut them all and sold wires directly on parts to avoid looses connections. I Don't do that at all but I will...
20190910_195842 (resized).jpg20190910_200635 (resized).jpg

#7 4 years ago

BEN

Benhurr

Inactive member

As you can see on pictures I also shunt all ground (white) wires as it is preconised on pinrepair.com to avoid bad connection who might burns transistors on A3 board.

#8 4 years ago

D G

Pin_Guy

Pinside member

8y 103K 3,996 11

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

The most commonly used replacement Bridge Rectifier used in pinball is the KPC3504 (35Amp 400V). This part come in both wire leads for board mounting and terminal leads (for using wire terminals) like the one in your picture.

Full part number KBPC3504W (wire leads) or KBPC3504T (terminal leads)
pasted_image (resized).png
pasted_image (resized).png

#9 4 years ago

Impzilla

Pinside member

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,

#10 4 years ago

GPE

G-P-E

GPE

Omaha, NE

13y 76,800 2,778 4

Quoted from Pin_Guy:
The most commonly used replacement Bridge Rectifier used in pinball is the KPC3504 (35Amp 400V). This part come in both wire leads for board mounting and terminal leads (for using wire terminals) like the one in your picture.
Full part number KBPC3504W (wire leads) or KBPC3504W (terminal leads)

Or GBPC3504, GBPC3504W

#11 4 years ago

BEN

Benhurr

Inactive member

Change by that one

20190910_195827 (resized).jpg

#12 4 years ago

Impzilla

Pinside member

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.

#13 4 years ago

D G

Pin_Guy

Pinside member

8y 103K 3,996 11

Dang it, I listed the same part number for both the Wire lead and terminal lead parts Hope you ordered the KBPC3504T version.

#14 4 years ago

Impzilla

Pinside member

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

#15 4 years ago

TNT

toddtuckey

Pinside+ Frequent

Southampton, PA

12y 83,400 713

Quoted from Benhurr:
Those 3 Bridges rectifier are same, and their references are only the Volt coming in...10Vac 16Vac and 50Vac. You also better change C1 and C2. As you can see on the pictures, wires are only plug on them by a pod but I've seen a video from TNT Amusement that preconised to cut them all and sold wires directly on parts to avoid looses connections. I Don't do that at all but I will...
[quoted image][quoted image]

You may be confusing my video where you cut the white molex plugs on System 80B machines. There is nothing wrong with slide on terminals for bridge rectifiers...however, soldering a new one in instead of reusing the original 20 year old slide on terminal is fine. Chances are the bridge wont go bad in your lifetime again anyway! Todd

#16 4 years ago

BEN

Benhurr

Inactive member

toddtuckey
Don't remember what video was...only that you show fuse holder when you say that and I'm also French so I don't understand everything you said but love all of your videos tips that you share by your great work.
Thx to precise on that reply and take care of you my mentor

3 months later

#17 4 years ago

???

boy141

Pinside member

6y 17,650 44

Any updates? I am also having the same problem!

#18 4 years ago

Impzilla

Pinside member

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.

#19 4 years ago

???

boy141

Pinside member

6y 17,650 44

/Impzilla/

I am replacing the 2 capacitors that are beside the bridges and replacing all the bridges. I can take pictures of the wires and the bridges for you. I am just trying to get the ramp working!

#20 4 years ago

Impzilla

Pinside member