I just replaced the pop bumper on my F-14 tomcat. It's been sitting for a couple months unplugged.

Now theirs a solenoid problem. First power up and the pop bumper locked on. quick turn off disconnected the pop bumper. back on, and Flippers were not working (all 4), both slingshots are out, the fuse was blowen.

Doing a solenoid test on individual coils, the yagof kicker locked on, next the left out lane save locked on, then nothing from the slings. Turned it off again.

Now when I power up the right sling pops then the left locks on.

Any thoughts? My electrician is out of town

I thought maybe I dropped solder onto a bundle of wires.... Didn't think so but hey. Looked over everything again, didn't notice anything. Cut open the wire harness and played with the wires for a bit in the area under the spot where I was soldering. Again nothing...

This was the fuse that blew

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Just making it look pretty. The old one was broken and worn out.

I don't think the problem is on the power line coming from 3j3 connection on power supply

It's looking like the other line running to the CPU board at IJI9 is the problem. There is 34v on the wire at the plug on the CPU board. I have a logic probe, but have never used it before. This might be a good time to learn how to use it.

The switches all look good. I've reconnected the pop bumper wires and it doesn't lock on at power up so I don't think it's the bumper switch. But. The left sling locks on still. It's not the sling switch.

I can't seem to find the return wire on the schematics that runs through the special solenoids ( blu/brn ) wire at IJI9.

Really hope it's not the switch matrix that's screwed.

I double checked every thing but if I did something dumb like hooking up the coil wires in reverse what would be the problem be; a pooched CPU? I have 4ohm resistance on the coil so it should be good. I didn't check the diode but that shouldn't be the problem.

There is 70v going to each flipper coil.

I have removed the blu/brn wire from CPU connector IJI9 special sol 1. When this wire is disconnected the game is fine, except for a couple coils.
The right sling is working fine. But, The left sling, pop bumper, 2 top left ball diverters and all 4 flippers don't work. Each of these coils read 70v on all 3 connections. The switch test shows nothing.

When the blu/brn wire is connected to the CPU the switch test reads "left sling" although both switches on the left sling look to be ok and not touching. The left sling coil locks on immediately. With fear of burning out the coil I disconnect the wire quickly.

So I don't think the problem is with coil power. image.jpg

In the switch edge test when I press the right sling the coil fires, should this happen?

The left sling switch doesn't register in the switch test but I do hear a click from a relay

Grounding IJI9 blu-brn wire to side rail locks on left sling, flippers don't work while it is jumpered.
With the wire removed from CPU connector iji9 #7 (blu/brn Q75 sp sol 1), I jumpered one side of the flipper buttons switch and then the other to ground, and was able to fire each if the 4 flippers this way.

Visual inspection of connections on the power supply below K1 seem ok, but look to have been worked on before. Connector 3J3 also looks ok, the vio-blu #4 wire traces back to the left sling that is locking on, as well as the right sling, lane diverters and other coils.

All connections look ok on the flipper power supply board should I be tracing the wires at connector I5j2? That's labeled "flipper power ground"

The flippers are working! Thanks for all the help so far.

IJI9 wire 1 and 2 tested fine, so I tested the transistor tab on Q75, that worked and pulled in K1 relay. The culprit ended up being the connector on the flipper power supply board. I5J2 wire 8.

IJI9 wire 7 is now reconnected. Flippers are working again.

The same 2.5A fuse under the playfield blew, the right sling locked on this time, so I quickly removed it again. I went into the switch edge test. No switches were on. The pop bumper, and both slings didn't register in the switch edge test. Everything else seems to be working.

I didn't see any other blown fuses.

I spent some time with it today, when the connector IJI9 is removed from the CPU and the fuse inline. I can ground each wire to ground the rail and fire each coil.

The switch stack for the pop bumper might be the problem, the score registers but the coil won't fire from hitting the switch.

Trying to ground the transistors to the rail had little luck. I also think there's damaged connections on the board for transistors Q71-Q77. I will look into this further.

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