This is my first foray here asking for advice. I bought a partially shopped Xenon pin a couple weeks ago and really want to bring it to great working condition.
It is in pretty good shape cosmetically, but the flippers need rebuild and there are some lights that stay on and some that won’t come on. The guy I bought it from replaced a lot of lamps with LEDs, and added the capacitors required to prevent flicker. Then he became busy/disinterested and sold it to me. It is my first pin....and it plays well when it powers on.
Today I adjusted the flippers to keep them from sagging ...the right was weak and neither could catch very well due to bad alignment. Well, I thought I was done, Fixed a bumper light that was not soldered well....and closed her up expecting to play a game.
After powering up the game, The initial lights game on (back glass and the ‘always ons’) and then a few seconds later a quick ‘flash’ of all the lights....a sub second flash....and then nothing. A few lights on the play field (the blue E two blue Ns and a green 35) stayed on, backglass scoreing lights not on, and the machine won’t initialize.

The machine is in that state now and I have no idea what to check.

This happened a few times last week, and I thought I had not attached the backglass connectors correctly so I undid them all and re connected them and all worked fine. This time, no go.

Other issues (when I do get the power up fixed...), The #2 rollover button up top does not drop the #2 target....all the others work fine.
The exit chamber sometimes does not ‘catch’ the ball.
The aforementioned always on and never on lights on the playfield, And I want to reinstall the coin mech that the previous owner disconnected and hardwired to the coin return button to issue credits!
Any advice for figuring out the intermittent power on prob, That would be a great help.

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MPU led flashing green 5 times. Found and replaced blown F4 (next time I will take fuses out to check them or use a magnglass...doh!). It was 5A.
Replaced it, powered up....worked...for a minute. When I went to play, everything seemed to go fine until I played a ball....something caused the fuse to blow again in the middle of play.

I put in another fuse and tested each feature one by one....rollovers, targets pop bumpers, slingshots, both saucers, rollovers......flippers....no prob.

Started a game and got a decent first ball....then when I plunged ball 2....blown again.

OK, after searching forum I found a post where a badly adjusted EOS contact (wasn’t making good contact) would cause overdraw and blow a playfield fuse. Sure enough, when ImDjusted the flipper on its pole so it wouldn’t sag, I inadvertently knocked the EOS blade out of position. Everything back in order. Now on th my ‘always on’ lighting issue. Thanks.

chas10e thanks for the pointer on the saucer issue. the pin is there. I am going to try your double post rubber suggesiton. Also, after doing some more research and talking to a couple techs I know, I've decided to spend the $ on a new lamp driver board. this 39 year old machine has all original boards. I'll have to learn how to replace one, but I think that I'd rather do that than start replacing transitors on an old board.
cheers!