Just received my pinball magic and as it is my first Capcom pin I´m wondering about some strange noise:

It happens during attract mode (maybe also during gameplay but not noticeable there) and has a regular pattern-its audible every 5 seconds on the speakers.
It is not related to the lamp matrix action nor to any changing content on the DMD.
It is independant of the volume setting
sample video here: https://drive.google.com/file/d/1FOQ7Ripd3LkJgQTqCEmVfmMpt3xIR6JI/view?usp=sharing
hard to hear on the video at 0:02, 0:07, 0:12,...its more dominant in real

Seems all the ferrites are in place. I guess it is all of the original ones, also tried 2 additional ones on the bottom connections on the soundboard without any change.
I assume all the caps on the boards are still the old original ones.

Is it something like a heartbeat from the CPU as it happens so regularly?
Anyone knows some details?

Is it just on my game or is it something normal on CAPCOM games?
My OCD does not like it, therefore I want to figure out the origin and try to solve it
20210714_102207 (resized).jpg20210714_102240 (resized).jpg

no one?

So all your Capcom games are super silent during attract mode? no periodic´clicking´noticeable?

any idea where it could origin from?

Created a hopefully better video. Still hard to hear on the vid but more prominent in reality
https://drive.google.com/file/d/1GNrY40DSPKhFpHHaGxNYmSVfDcUCm27e/view?usp=drivesdk

Thx for your replies guys!

Have already reseated all connectors on the soundboard.
Noise comes from all the 3 speakers
I have to correct: in fact it is not totally independant of the volume setting but still noticable at volume setting 0. From 1 onwards there is only a slight increase with volume
It is in attract mode and also in diagnostic mode. Maybe even during gameplay but not noticable as game music is running
It is not a relay or other mecanical noise

Does your soundboard have the same solder bridge at pin 15/16 at U1?

20210723_144035 (resized).jpg

Thx for your reply!

Removed the bridge without any change

Just figured out that the noise is generated on the soundboard itself. By dis/reconnecting the 5V the board gets initialised and the 5 seconds click pattern restarts

did some further investigations:

the solder bridge at U1 pin 15+16 seems to be on purpose. checked another board which had the same.

clicking noise: seems to be normal on those games. checked a friends PM and his AB - both have the exact same behaviour.

What I also noticed was some´crackle/spatter´noise on some certain sounds played-always heard at the same point of the sample.
I was messing around, measuring, changing eproms, chips (U24 to V1.03), caps, speakers, asked Pfutz,...could not get it solved. Same issue was also described by other users in forums...
However-it was the same on my friends airborne soundboard but not on his pinball magic one...

maybe all is related to degradation of components or tolerances or...
However...long story short: I stopped further investigations and will just play more