Hi Guys - so,I am having a battle royale with my Royal Rumble....

I now have coil problems:

Flippers don't work. When I press the button, they buzz - if I manually move them up they stay up - I believe the 8v is working but the 50v is doing nothing.
The flipper board leds are not even flickering.

Now in parallel, when I enter diagnostics - no flashers work. and when I test coils and flashers, some coils fire when flashers should fire - Mainly the corresponding L/R Coil fires when I select the flasher.

Apart from the VUK that only fires when a flasher should fire...

I changed the Q28,29,30 transistors and pre-transistors - no change

I also own a maverick and I swapped the CPU & PPB board - no change.

So I don't think this this is a problem with the boards or with the L/R coil

anybody got any other ideas?

Next step, I am going to replace all the coil diodes - could it be a bad coil?

Thanks a lot in advance

Mike

Damn - not an easy fix for a newbie!

Mine was the power board - the replacement was also faulty..

If the fuses are fine and you have swapped so many boards there isn’t much else to work on - if it is just the pops and flippers - I believe these are the high power coils in the game - triple check fuse f8 on the playfield power board - 4A fuse - just in case if you have one - swap it anyhow….

Have you checked the fuses on the SSFB - solid state flipper board - these are inside the cabinet not in the backboard..

The following link is to an amazing source of info for data east repair:

https://techniek.flipperwinkel.nl/desega/index2.htm#flip0