(Topic ID: 181463)

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

By Nepi23

7 years ago


Topic Heartbeat

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  • 11 posts
  • 3 Pinsiders participating
  • Latest reply 7 years ago by Nepi23
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#2 7 years 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!
ยป 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.

#4 7 years ago

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

#6 7 years 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.

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