AXs are tough with the short throw. I got mine tuned in by, with the game off, manually activating and deactivating it. I looked at each switch one at a time and seeing if it changed state each time and had enough overage to slightly move the short switch blade. For the make-breaks I concentrated on one blade at a time. It worked.

In your video the first time you hit the replay button the game doesn't reset but the 2nd player light comes on. That's a clue to what might be going on:
Pioneer AX relay (resized).jpg
The first time you hit the replay button the S/Start relay should fire which in turn should fire the AX/Reset Control relay. Instead your game is firing the CX/2nd Player relay. For that to happen it seems that the Make/Break switch on the U/1st Ball relay in the red box isn't doing the right thing, either because it's not adjusted properly or because the U relay isn't firing.

/Mark

I think the #2 100s score reel switches need ajdustment. Use player #1 100s reel as a comparison. Start your switch comparison with both reels at zero.

The Score Reel switches are pretty fussy. Adjusting them visually only gets you so far if you don't understand what they're supposed to accomplish:
Pioneer score reel reset (resized).jpg
Every Score Reel has two circuits that drive it as shown in the top half of the schematic above. The lower of the two paths, through the M/100 point relay switch, is used during game play to add 100 points. The upper path, through the highlighted Runout switch is used only during reset. In your case reset pulses from the Motor 1A switch on the far right are not getting to the Score Reel because either the highlighted Runout switch or the P4B switch on the Player Unit (in the red box) isn't closed. The Runout switch only opens when the Score Reel shows a zero. It blocks any more reset pulses from getting to the Score Reel once the reel has reached zero.

The P4B switch is mounted on the Player Unit in the backbox. See https://pinside.com/pinball/forum/topic/gottlieb-socer-player-unit#post-5953227 for an example map of the Player Unit switches.

There is another switch on each Score Reel called the Reset switch in this schematic and shown in the bottom half of the schematic. It too closes when the Score Reel reaches zero and allows the Player Unit to move on to the next position once all four Score Reels of a given player have reset.

In your case it seems that either the Runout switch or the P4B switch in the top half of the schematic does not close which keeps the Score Reel from advancing to zero during reset. It also seems that the red Reset switch in the bottom half is stuck closed so the Player Unit doesn't wait for the Score Reel to reset.

Generally it's safer to use the wire colors from the schematic to identify the suspected switches rather than adjusting them all.

YES!

I too have a Pioneer with a start up issue as well. While playing the ball got stuck in the kick out hole. I slid the glass down, flicked it out and let it drain. What I found odd was it did not move to the shooter lane or recognize the ball drain. I shut down the game. Later when I went back to check/clean that switch the game turned on but in tilt. The only way to get a partial start sequence was to manually hit the start relay. I get the score reels to reset, drop targets and most of the rest of the sequence. What I don't get is the ball kicked into the shooter lane or any playfield operating other than the lights. No ball in play lights either, naturally. The game over relay, "Q" pulls in as soon as the power comes on as well as the First Ball relay "U". The hold relay "R" pulls in after the start relay is manually pulled in. During the reset operation "AX" relay Reset control relay, pulls in after the start relay is activated then releases once the reset is complete. The game is set on free play with credits showing. Every time the game is shut off it always turns on in tilt mode. I shopped this game about 3 years ago and it has been playing great. I know I'm missing something simple. I did go over the PB4 switch and also the whole player unit.( I've been chasing another odd issue player unit related, but I have not gone back to it. Howard was helping me in an older thread..) Any thoughts? In the meantime I'll start studying the schematics....

You might consider starting your own topic...

When you hit the Start relay does it hold itself in for 1/3 of a Score Motor turn or does it release right away?
After reset is the Q/Game Over relay active? That would explain the dead playfield and ball in play lights.

/Mark

I thought I may start a new topic...
The start relay releases right away. It does initiate the score motor etc, As soon as I turn on the power the Q/ Game Over relay pulls in and stays in including after the start sequence ends. I'll give that a look.

It should hold on for 1/3 of a Score Motor turn until the Motor 2B switch opens. If it's not one of these switches isn't closing:
Pioneer Start relay (resized).jpg

Will it stay on if the Q/Game Over relay and the U/1st Ball relay are energized or do they need to de-energize? It seems according to the start sequence they are supposed to once the S relay is energized.

start pioneer (resized).png

You were correct. I looked at the low hanging fruit first and discovered the slam switch on the coin door needed cleaning. A quick clean and adjust and I'm back up. Thanks so much. Now on to my Space Mission... LOL