The little bar controls the coin lockout feature to the coin mechs. When the power is off, the coin lockout feature will divert coins to the coin return tray if coins are inserted in the coin slots. If the power is on, then coins will be allowed to drop on the coin switches to start a game or add credits. It sounds like one of the parts on the coin lock out feature is interfering with the coin switches. Pull the coin mechs to see if there are any stuck coins in the mechs, bent rods related to the coin lockout mechanism, or bent coin switch wires.

The coin lockout coil on the door is a continuous use coil that is always on when the machine is powered on. It only regulates coins that can be accepted if the machine is on or off. For troubleshooting problems with the machine, it doesn't matter if the coin lockout coil if connected or not. If you plan not to use coins when playing the machine, you can just disconnect one of the wires from the coil...

In order for the 5000 point feature to score when hitting a target, a switch on the C relay needs to close. Check the C relay to make sure the switches are clean and adjusted properly. Look closely at the C relay switch with the brown/white wire and orange/black wire. You can also look at other related relays to the 5000 point feature like the D relay switches, Q relay switches and the G relay switches...

Some other items in the circuit to check are the J relay disc and the playfield Jones plugs. Make sure the J relay disc is clean and that it will click into each position easily. Unplug the playfield Jones plugs from the main board, make sure they are clean, and plug in the Jones plugs again to make sure they are fully seated...

Here's the circuit for the hold relay:

15 amp fuse - red wire and red/yellow wire
Bounce switch - red/yellow wire and red/white wire
Anti-cheat switch - red/white wire and slate wire
R relay switch - slate wire and yellow wire
T relay switch - yellow wire and slate/green wire
Lightbox tilt switch - slate/green wire and slate/green wire

Also, check the start relay switch with the slate color wire and maroon wire.

Make sure these switches are clean and adjusted properly...

The R relay switch (hold relay switch) with the slate wire and yellow wire will enable the R relay coil to be constantly energized...

D relay is the sequence score control relay. When a drop target is hit, power will be sent to the J relay disc. If the disc wiper is on a corresponding position with the lit target, power is then sent to score motor switch 1C (slate/white wire and white/green wire) and then power goes to G relay switch (white/green wire and blue wire), and then power goes to the D relay coil.

Hold relay would be energized during the entire game. Hold relay is off in tilt mode...

We'll have to look at the switches that relate to the 5000 point scoring and the spot advance. D relay is related to the 5000 point scoring and the spot advance. Check the following:

D relay switch - blue wire and orange/black wire
D relay switch - black/yellow wire and yellow/red wire

Make sure these switches are clean and adjusted properly. Regarding cleaning the switch contacts, sometimes you'll need the "scrub" the contacts clean using a Flexstone or paper fingernail file.

Also, examine the D relay coil. Does it looked burned? Any stray wires at the terminal lugs? Do you have a multi-meter? You can measure the resistance of the coil to determine the "health" of the coil...

The D relay switches in question would be normally open (NO) single switches. If you can't identify the switches, just clean and adjust all the D relay switches...

Yes, I remember seeing your machine - Craigslist, Facebook? I think the seller had it listed at a pretty good selling price... Interesting to see that your machine has the same aftermarket coin pricing labels as my King Pin ... With all these machines, they seem to have extreme playfield wear near the top kickout holes. Clay's Pin Repair Web site has an article on how to repair the playfield wear by those kickout holes:

http://www.pinrepair.com/restore/kppf.htm

Here's the path for the target specials:

Score motor switch 1A - red/white wire and slate/red wire
Score motor switch 2C - slate/red wire and yellow/red wire
D relay switch - yellow/red wire and green/red wire
Q relay switch - slate/green wire and orange/green wire (3 ball game only)
H relay switch - orange/green wire and slate/white wire

The D relay is the sequence score control relay and the H relay is the special sequence control relay. When the target special is lit, the D and H relay switches listed above should be closed. At this point, the score motor switches would close and open to send power to the Add Replay Unit solenoid after a target special was hit...

The D relay will energize when all the drop targets are hit the first time via a G relay switch, which allows power to reach the D relay coil. In this case, the D relay coil will be energized until the end of the game or until the game is tilted. When all the drop targets are hit for the second time, the H relay will be energized, which will allow power to get to the Add Replay Unit solenoid when a lit drop target is hit...