(Topic ID: 239785)

Stern Meteor sound looping


By RTSMikeM

23 days ago



Topic Stats

  • 12 posts
  • 5 Pinsiders participating
  • Latest reply 5 days ago by barakandl
  • Topic is favorited by 1 Pinsider

You

Linked Games

  • Meteor Stern Electronics, 1979

Topic Gallery

There have been 3 images uploaded to this topic. (View topic image gallery).

MPU-Close-Up (resized).jpg
New-Sound-Board (resized).jpg
MPU (resized).jpg

#1 23 days ago

I've got a 79 Stern Meteor I'm trying get working.
I've replaced the rectifier with a new board (and repinned its connectors) and also replaced the SB-300 sound board with a new one from ksarcade.net
I've checked all connectors and solder joints on the MPU. They look great.

The machine seems to boot up ok (I get the 7 beeps)
However once I add a credit to the machine and hit the button, the sound starts looping 2 low tones over and over like its stuck.

I've attached a link to a sound file on youtube so you can hear my issue:

Any ideas on what that might be or how to solve it?

#2 23 days ago

sure you got the top connector on the right way?
I have a Dracula, that drove me nuts until I realized
the top connector was on backwards.

#3 23 days ago

Is it the original MPU or aftermarket?

#4 23 days ago

I've posted pictures of the new sound board and the MPU.
The MPU looks like it has 40 year old stickers on it...
So my guess is that it's original.

The sound did work a few times (hit and miss) when we 1st got the machine.
That was before all the work on it.

Would stuck drop targets do this?
I'm not sure what else I could have borked.

MPU (resized).jpgNew-Sound-Board (resized).jpg
#5 23 days ago

If it was working properly at one time, then I would lean more towards the ribbon cables being bad. If it was always messed up then I would suggest getting new 5101's. This game and other SB 300 sterns need the fast access 5101's to play their sounds correctly.

#6 23 days ago

I've only owned a pinball machine about a week.
I can't find anything that say's "5101" on it in the Meteor boards.
Also I wouldn't know a fast 5101 from a slow one!

Also how can the ribbon cables just go bad sitting there?

I included a close up picture of the MPU, hopefully you could point out what needs replacing.
Thanks!

MPU-Close-Up (resized).jpg
#7 22 days ago

The ribbon cables are notorious for going bad in this era of stern. The guy that you got the sound board from sells a new set. The 5101s are at u8 and u13. Start with the ribbon cables, and then we can diagnose further is need be.

2 weeks later
#8 8 days ago

I replaced both ribbon cables and the 5101 chips at U8 and U13. No dice.
Still does the exact same thing.

I WAS working intermittently when I got it. Now not at all. Could a stuck target do this?
I there somebody who could go through the board and test it out?

What do I do next?

#9 5 days ago

I am having the sane ussue and the ball isnt ejecting. I have been told to check the fuse on the bottom of the playfield and the solenoid.

#10 5 days ago

My fuse is good. So that isn't the issue. Is your sound looping too?

#11 5 days ago
Quoted from RTSMikeM:

My fuse is good. So that isn't the issue. Is your sound looping too?

Yes, just like yours.
All my fuses are good.
Are your coils firing when you run a self test?

#12 5 days ago

Does solenoid test work? If no check the fuse under the PF near the flippers.

I think the background noise is continuously starting over because the game is not feeding the ball to the shooter lane is my guess. Tries to feed the ball to shoot lane. Coil doesnt fire. Game sees ball is still in trough. Does end of ball routine which makes the background noise starts over. And that goes on for a never ending loop.

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