Ball goes to Merlin's hole, strange crackling sound, lights flicker


By Nepi23

7 months ago


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  • Latest reply 7 months ago by Nepi23
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#1 7 months ago

Have a look at this video - is this normal behaviour, when ball enters Merlin's hole, there is
some sort of a cracking "electrostatic" sound? What might be causing it? Thanks for any help!

» YouTube video

#2 7 months ago
Quoted from Nepi23:

Have a look at this video - is this normal behaviour, when ball enters Merlin's hole, there is
some sort of a cracking "electrostatic" sound? What might be causing it? Thanks for any help!
» YouTube video

It was hard to hear but it sounded like the VUK was firing. I would guess you may have a low 12 volt unregulated or a switch matrix problem.

#3 7 months ago

Thanks! I am a total newbie when it comes to issues like this. Any tips what I should look for?
It has been working ok, but now it started to do this after we moved the pin.

#4 7 months ago

Measure the voltage of the 12 volt unregulated. It is TP103. I think it should be around 13.6 volts

#5 7 months ago

Friend, who is very good at electronics, visits tomorrow, so we'll do some measuring work then, thanks!

We carried the pin from downstairs to upstairs with playfield removed, so perhaps there is some loose wire
in some connector to the backbox... Any tips, which connectors should be checked?

#6 7 months ago
Quoted from Nepi23:

Friend, who is very good at electronics, visits tomorrow, so we'll do some measuring work then, thanks!
We carried the pin from downstairs to upstairs with playfield removed, so perhaps there is some loose wire
in some connector to the backbox... Any tips, which connectors should be checked?

Check the connections to the 10 opto board. It is near the middle of the bottom of the playfield and is mounted perpendicular. That may be it since you took the playfield out.

#7 7 months ago

Thanks for the tip, will do that

#8 7 months ago

Nope, it was not that, connections seemed to be ok. But I am sure there is some similar problem going on here.

#9 7 months ago

I found the culprit. It was the illuminated backboard Once disconnected, everything was like I've used to.
It may be that the illuminated board should work like that, but to me the sound was strange.

#10 7 months ago

What kind of Illuminated backboard light are you running? Is it off the 12v? We sell them and they run off 6v, never had a problem reported. Very surprised even off 12v that it would cause an issue. How did you tap into the game's power?

#11 7 months ago

Its really strange that many people do not even hear the "static" sound. I have come to the conclusion that it most probably was the change of location and that some of the acoustics in the room changed, so that's why I hear the sound. The leds lighting the board is this set: http://www.pinballdecals.com/PlexiBoard_LEDLightKitsPage.html
It taps into three connectors on the backboard J138, J105 and J111.

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