Looks like Q71 is the driver for that coil. Maybe a shorted out Q71?

pasted_image (resized).png

Did you measure them with a DMM as Looks can be deceiving!

http://www.pinrepair.com/begin/index.htm

Once there scroll down to "Transistors and Chips."For each of these have one lead of the DMM on the metal case (tab) of the transistor (which is usually the center leg of the transistor). Then the other lead of the DMM will test the outside two legs individually. A value of .4 to .6, or 1.0 to 1.2 should be seen, depending on the exact transistor, and which lead (red of black) is on the metal tab. The biggest indicator of a bad transistor would be a value less than .2 (probably a short)."

and

http://www.pinwiki.com/wiki/index.php?title=General#Testing_a_Transistor.2C_Silicon_Controlled_Rectifier_.28SCR.29_or_Field_Effect_Transistor_.28FET.29

If the zener diode is turning on the coil it will be shorted. Easy to check ohms across the zener, a low reading is bad.

Do you have a logic probe?

Then this should be easy for you.

Disconnect 5J11 and 5J12 on the aux power supply. This will cut the power to all flashers and solenoids. Now you can turn on the power to test with no worries of melting coils. Then you can hook up your logic probe to the CPU test points and start testing.

Also please check for old battery corrosion.

^^^^ Not a bad idea to take a pic of the CPU board.

Lets start with the left kicker(SS#2). Page 3-7 in the manual shows Pins 5 and 6 of U-45 are inputs and pin 4 is the output. With the power on and in attract mode both pins 5 and 6 should be high and pin 4 should be low. If good the check the base of Q-70, this should be a low also. If good then test the base of Q-71, this should be a low also. Let me know what you find.

Use a ohm meter and check Q71 metal tab to ground. Should be .600 meg or higher.

Sounds like the cpu is fine. Certain coils are high voltage coils and they a higher power tip to control them. They are on the aux power supply. Q6 controls this coil. Test it for a short.

You weren't ready to connect power at 5J11and 5J12 yet. Now that attract mode is good it's time to start a game and retest U-45 and U-50 inputs. The inputs from the switches should still be all highs and the other enable inputs should have gone to lows. Check these and let me know what you find.

When a pin is not maintained for a long time, the power supply starts putting more AC voltage on the DC and this stresses the logic parts.

Your testing shows that U-45 and U-50 needs to be replaced. Then more testing will need to be done to correct any other problems.

Edit for bad talk and text.

Any time you change a TIP you need to change the corresponding diode. So you need to change D-22

What does the base of the predriver and driver show. If both show low then check resistance of metal tab to ground. Sometimes the TIP test good but are bad when powered up.

This for the flip up reset, and looks fine.
You need to check U-45 pins 2 and 3 inputs and pin 1 output for the right pop bumper problem.

Lets try testing U-45 again, in attract mode pins 2,3,5,6,8,9,11 and 12 are high. Pins 1,4,10 and 13 are low.
In game mode,pins 2,5,9 and 12 are high and pins 1,3,4,6,8,10,11 and 13 are low. Then place your probe on pin 1 (its low) then push the skirt of the right pop and the probe should read high. Then do this for pin 4, push the left sling rubber and pin 4 should go high. Next would be pin 10, push the right sling and pin 10 should go high. Last check pin 13, and push the left pop skirt and pin 13 should go high.

With a game started measure resistance from the collector pin 2 to ground on all 22 TIPs on the Cpu.

pasted_image (resized).png

DMM in resistance test.

Black ground. Red center lead.

There is only 22 TIP 122 that control solenoids, there are 8 TIP 42 and 8 TIP 122 in the lamp matrix section.

Q-7=250. Q-69=9.5 Q-71=246 Q-75=16.5 these needs to be replaced with TIP102. Then retest again and all should be infinite.

Don't be to sure on that, just ask my wife.

You must leave 5J11 and 5J12 off until all troubleshooting is done. Other wise you will keep damaging stuff.

Retest with DMM not by hooking up coil power.

Replace the predriver for these and retest.