(Topic ID: 233301)

Help me bring Gottlieb Roller Disco back to life


By Jakers

3 months ago



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  • 9 posts
  • 2 Pinsiders participating
  • Latest reply 3 months ago by Cheddar
  • Topic is favorited by 1 Pinsider

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#1 3 months ago

I picked this up as a project machine. All components are here and it has a rottendog power supply. I’ve been going through Clays system 1 repair guide step by step. I’ve made it to plugging in the game for the first time. The GI lights come on and now I’m checking voltages at the input of the power supply (rottendog). They should be as follows:

11.5v on pins 1 and 2
14v on pins 4 and 5
69v on pins 6 and 7

My voltages are:
16.8v on pins 1 and 2
20.4v on pins 4 and 5
0v on pins 6 and 7

The output voltages from A2-J2 should be:

5v on pins 1 and 2
-12v on pin 6

My voltages are:
7.15v on pins 1 and 2
-17.35 on pin 6

Are these voltages too high to send to the CPU? I don’t see a pot anywhere to adjust voltages.

Where do I go from here?

#2 3 months ago

Any suggestions on how to adjust or diagnose these voltages coming from the transformers?

#3 3 months ago

Not sure why you're reading those values but here is another thread where using different grounds yeild different values https://pinside.com/pinball/forum/topic/gottlieb-system-1-rottendog-board-or-transformer-issue

#4 3 months ago

So, after ripping my hair out trying to figure out why these transformer voltages were so high I started thinking something was wrong with my multimeter. I tested my wall outlet and it was reading 175volts. Did some research on that and found out when a multimeter battery is dying it can start reporting false voltages.

Replaced the battery and it's reading correct now.

Retested all my pin voltages (with much better outcomes) and they are as follows:

A2-J1 input voltages
Pins 6&7 measure 73.5vac (should be 69vac)
Pins 4&5 measure 29vac (should be 14vac)
Pins 1&2 measure 24vac (should be 12vac)

A2-J2 output voltages (VDC)
Pins 1&2 measures 5vdc (should be 5vdc)
Pin 6 measures -11.95vdc (should be -12vdc)

A2-J3 output voltages (VDC)
Pin 1 measures 59.2vdc (should be 60vdc)
Pin 3 measures 41.8vdc (should be 42 vdc)
Pin 7 measures 3.6vdc (should be 4vdc)
Pin 8 measures 8vdc (should be 8 vdc)

The Rottendog output voltages seem to be very close if not spot on to what they need to be. The input voltages coming from the transformer are still a little high. Is this something to worry about? I don't want to fry the Rottendog board.

#5 3 months ago
Quoted from Jakers:

So, after ripping my hair out trying to figure out why these transformer voltages were so high I started thinking something was wrong with my multimeter. I tested my wall outlet and it was reading 175volts. Did some research on that and found out when a multimeter battery is dying it can start reporting false voltages.
Replaced the battery and it's reading correct now.
Retested all my pin voltages (with much better outcomes) and they are as follows:
A2-J1 input voltages
Pins 6&7 measure 73.5vac (should be 69vac)
Pins 4&5 measure 29vac (should be 14vac)
Pins 1&2 measure 24vac (should be 12vac)
A2-J2 output voltages (VDC)
Pins 1&2 measures 5vdc (should be 5vdc)
Pin 6 measures -11.95vdc (should be -12vdc)
A2-J3 output voltages (VDC)
Pin 1 measures 59.2vdc (should be 60vdc)
Pin 3 measures 41.8vdc (should be 42 vdc)
Pin 7 measures 3.6vdc (should be 4vdc)
Pin 8 measures 8vdc (should be 8 vdc)
The Rottendog output voltages seem to be very close if not spot on to what they need to be. The input voltages coming from the transformer are still a little high. Is this something to worry about? I don't want to fry the Rottendog board.

So I had serious problems trying to measure voltages on the Sys 1 power supply so I made myself a cheat sheet. First thing I did was ditch my RadioShack DMM and buy a used fluke. Readings are so much more accurate.

The cheat sheet shows where to measure for each reading.

In a nutshell for the connector:
Black to Ground
Red to J1 Pin 1 then 2 ~12 VAC
Red to J1 Pin 4 then 5 ~14 VAC
Black to J1 Pin 6
Red to J1 Pin 7 ~69 VAC

Power supply:
Set DMM to 200 VDC
Black to Filter Cap Ground
Red to J2 Pin 1 then 2 (from left) 5VDC
Red to J2 Connector Pin 4 then 5 (from left) Ground
Red to J2 Connector Pin 6 (from left) -12VDC
Black to HV Filter Cap C6 Ground
Red to J3 Pin 1 (from top) 60VDC
Red to J3 Pin 3 (from top) 42VDC
Black to metal chassis Ground
Red to J3 Pin 5 (from top) Ground
Red to J3 Pin 7 (from top) 4VDC
Red to J3 Pin 8 (from top) 8VDC

Here's the sheet: https://docs.google.com/spreadsheets/d/1NV3NaXS6d696csiFSRcvi900dFwyPZSgFZfkDUwaZ4U/edit?usp=sharing

It's basically Clay's video broken into precise steps. If you want to fill it in or modify please make a copy.

#6 3 months ago

Thank you for that spreadsheet. I downloaded it and will definitely make use of it.

Now that I've confirmed my output voltage levels are where they should be, I'll be repining all the edge connector pins. Almost every one is either corroded or broken.

Question...are all 4 flippers supposed to have end of stroke switches on them? My left lower flipper does not have an end of stroke switch and is wired differently than the other three. (see pics)

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#7 3 months ago

looks like an operator repair. Yeah it needs the diode and the EOS switch on it

#8 3 months ago

Thanks! I'll add that to my Marco order. One more question. The drop target reset coils. What is the correct coil part number for Roller Disco? There are 2 in the game. My left looks to be wired correctly but the right has been cut and is a different number. Left coil number is A-17891 and the right coil number is A-18318. The both test good when testing resistance.

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#9 3 months ago

Sorry I don't have an answer to that question

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