(Topic ID: 259808)

Haunted House vuk problem

By thierryv

2 years ago



Topic Stats

  • 5 posts
  • 2 Pinsiders participating
  • Latest reply 2 years ago by thierryv
  • Topic is favorited by 2 Pinsiders

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#1 2 years ago

Hi all,

Due to a weak vuk on the lower pf I decide to do the suggested modification with the bpdb. It works fine, so far so good, however the vuk now pops everytime when one of the non mpu controlled coils  ( such as kicking coils or flippers from lower or main pf  ) gets energized .What could be the problem ???

IMG_6559 (resized).JPG
#2 2 years ago

The popbumper board is getting some noise from the solenoid GND lead...… What usualy helps is changing the input filter. Change the input cap to 1uF ~ 2.2uF. What also helps is running a seperate GND wire to the popbumper Ground point to the mainplayfield. But this requires some wiring and an additional connector.

Marco

#3 2 years ago

Hi marco,

it's a small pinball world
But where exactly should I place this cap, and what value for this cap, 50V like the one on the useless K relay ( see picture ) ?

#4 2 years ago

Hi Thierry, I keep haunting you

Change C1 to 1uF or 2.2uF, 10V or up. You can use a small ceramic cap or a polarized one (tantallum or electrolytic). When using a polarized capacitor beware of the orientation: the postive lead connected with the trace to resistor R1 and the negative lead to GND (use your Fluke to beep out with the negative side of C4 (47uF) if you are in doubt.

#5 2 years ago

Well Marco, I have deep respect for your knowledge.
Did the modifications and everything works like a charm now.
I owe you two beers now.
By the way , haunted or haunting did you notice we live almost in the same town ? Only the middle letter is different

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