Hi

I acquired a sys11 Millionaire

The right jet bumper coil was burnt and the Q73 was toast as well black smoke must of been present as well

The ball was wedged between the rail
Guide and the bumper skirt :-/

So I replace the coil / Q73 and Q72 to be safe

I did sub out the TIP122 for a TIP102 as its more robust

I cleaned it all up and put it back in the head
Used my meter all paths have continuity etc

Now it immediately locks on upon power up

What else am I missing ??

I see these are special coils in the Manual

Any help would be great

Attached is before and after

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This game doesn’t have the aux Board

Sound / Cpu / flipper / power supply

Thank you

I am still digging but thought I had the issue resolved

Would the TIP102 be the issue since it was a TIP122 or there equal parts

That is correct I disconnect the connector with the blue corresponding wire and no longer locked on so I have a bad I see Chip that’s affecting only one coil I assume

Which chip ?

u50 Or u45 ?

Hi Everyone

So I replaced the U45

Same results

Used meter all paths are good and making contact

The right jet still immediately locks on upon power up

So to recap

Replaced Coil - Driver Q + Pre Driver Q
Also replaced the U45

Both Transistors are still testing good

Any other reasons this is happening

Thanks
James

8E6E1DBB-CACB-4652-8F48-91569912A4F2 (resized).jpeg

C5C62D14-D0E1-47E4-A293-87313127A1CD (resized).jpeg

Yes ASAP at power up

Locks on

All other coils are fine

Not sure what else feeds this special coil not much in the manual

Any help is great

Thank you

Okay so if I disconnect this what will it isolate ?

Either locks on or not at all ?

I’ll take a look and report back

Thank you for the explanation

Hi

With 1J18 unplugged from cpu

Jet still immediately locks

What else might be causing this ?

Not a huge deal as my kids enjoy it anyways but rather it worked correctly

Thank you for your help

Hi

Okay so your saying this is looking like a playfield issue from what I have already done to remedy

And not the Game Board

Just wanted to clarify

As mentioned above the original there was a stuck ball that caused this coil to lock down

I appreciate everyone’s help

I truly do

Hi

To clarify your message for point 2

With the 1J18 The coils Does still lock on

Would you recommend me replacing the 2 driver transistors even though they still test good or do you feel that’s a waste of time as the problem is else where

What page in the Manual did you find the schematic for the special coil

I Really appreciate all of the assistance you have given me to give this game a new lease on life

Hi

No offense taken and again thank you for helping me try to isolate the issue

- -

Just following the standards steps here

Burnt coil discovered - replaced coil and the driver Q / Pre Driver

Didn’t solve the issue Going even deeper than my usual repair entail at this point but still willing to try my best

So then I replaced the U45 IC - still no resolution Coil a locks - no change as before the IC chip was replaced

Now to clarity with Only 1J18 connector unplugged the Jet locks as soon as power is on before game fully boots

Sorry for any confusion

Hey

All good

I’m off all Morning tomorrow and will slowly pick through this Valuable help you have provided me in hopes to find the failed component causing this locked coil

I will report back with my findings

Again I am grateful for your assistance and hope To be successful as results