Not every time but sometimes when the outlane switches are triggered , all the machine computer controlled lamps start to flash. It looks just like a lamp test mode. Once a new switch is triggered the lights all go back to normal. This is an intermittent problem and was wondering if anyone had any ideas . It seems the switches are activating the light test but they should be on different circuits. The lamp board, mpu, and solenoid board are all new aftermarket replacements. I thought it was a ground issue because the backbox ground was not secured. Fixed that but still have problem. Then I thought the issue was only present with the playfield glass and lockbar off . It was not and happens with glass and lockbar installed.

Game has full LEDs and alltek lamp board.

Bump. I've read on pinwicki the coin door test button is not even in the switch matrix. I'm puzzled how a playfield switch would trigger lamp test. Any suggestions would be appreciated.

Self test switch not part of switch matrix. A single signal is sent to self test switch via j-3-1 connector on mpu to ground via connector j-2-7 on solenoid driver board. I see that I have a loose wire and nothing is connected to J-2-7 on solenoid driver board. Maybe that yellow wire goes into connector j-2-7? My self self test switch does work . I'll keep digging and try looking at schematics...

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Correction I counted wrong. There is a wire in j-2-7 . Not sure where that yellow wire is supposed to go.

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Pinsider suggested I check outlane switches for shorts. Found none. I've been monitoring game for when my problem happens. All computer controlled light flash continuous whenever outlanes are triggered with special lights lit . It also happens when extra ball is lit and achieved after dropping all four drop targets. These are the only conditions which causes all controlled lamps to light .

My yellow loose wire in backbox should go to last connector for mpu j-3 according to the manual. Seems to be a return for a cab switch. I don't think this is related to my problem. Kind of stuck from here. Not getting any responses. If I ever figure it out I'll post what the cause was. I hate when I find someone had same issue as me but never bothered to post what fixed the problem..

Thanks for the reply!!! I'm heading to work but will check when I get home tonight.

Just installed a alltek mpu so I'm pretty certain speed jumpers are set to bally. That was a install step. I will verify though and look at the other things you mention. Problem was present prior to mpu swap. Also had problem before I did a playfield swap. It was a populated playfield with its own harness.

I'm useing a different playfield harness and still have the problem.

Quick speed set to right for bally mpu. Removed ball from out hole.standups reset up No switches closed in test . Outlane switch number are showing correct when triggered switches.

Yes. Unfortunatley flashing light behavior was also present with stock mpu which I just replaced.

Still no resolution. A pinside buddy is going to lend me a new board set. Even though all my boards are new maybe one is the problem. Don't know what else to try. Same problem with two different playfield harnesses so I'm eliminating that as possible source .

Good ideas. I don't have the factory lamp board but i do have an untested one I can try .By invert do you mean set all dip switches opposite of current position? Do you think power driver board would gave any influence on my problem? It's a rottendog and not alltek. Seems problem has to be in one of boards or backbox connector/ harness. Do you agree? Thanks

Well I switched all dip settings to the exact opposite settings. Problem stopped. I then switched each setting back one at a time and tried to trigger the problem. When I got to switches 25 through 32 the problem came back. These settings seem to be for sound setting of all things. This bank of switches needed to be set the exact opposite of my original settings for the problem to not happen . Very strange. Not fond of the new sound settings but happy game is functioning properly.

Thanks for sticking with me Quench !!!! Pinside is a great thing for this hobby.

Problem occurred only when scored outlane specials or all drop down target special ..

Ok. Will do. This photo is the exact opposite of my current settings. I used this old CPU as A guide to put opposite settings on the new installed alltek mpu . The only way I saw the problem is making switches A thru F to enable outlane specials OR dropping target bank until special light in front of targets is lit and achieved and drop all targets. . Number one situation with saucer that you listed does not seem to have any effect. Must score A thru F to light outlane Special.
I hope you realize how thankful I am for you to take the time to help me. It is much appreciated.

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Correct. Any other switch activated would stop the lamp test flashing problem....

Please see photos .. This is factory mpu.

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No sir. Don't even know what a EPROM programmer is .... Yeah you would think Alltek would not use an older version.

Thanks for the input. My issue has not reappeared with my current settings. I'm a happy camper.