(Topic ID: 261517)

Stern Magic - Dead On Arrival - No coils Fire


By McPin54

3 months ago



Topic Stats

  • 6 posts
  • 3 Pinsiders participating
  • Latest reply 3 months ago by McPin54
  • No one calls this topic a favorite

You

Linked Games

  • Magic Stern Electronics, 1979

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#1 3 months ago

Picked up a very nice Stern Magic that sat for years. Game would not even turn on.
First thing I did was replace rectifier board- Checked test point and voltages are correct.
Replaced all components on driver board that tested bad or looked bad and recapped.
Put in a new allteck MPU.

I get displays, GI, Inserts, games scores, but NO Coils fire.
Then I put in a new Driver board in and Coils still do not fire. I checked the test points on Driver and all voltages read correct

I am getting 5.7 volts at all coils which is incorrect. I am kind of stuck on where i went wrong. If my check points at the driver and rectifier are good, Im guessing I have a wire misplaced on a connector somewhere? Any help is appreciated. Thank you in advance. I have uploaded some pics

#2 3 months ago

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#3 3 months ago

check the fuse under the playfield?

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#4 3 months ago
Quoted from McPin54:

I am getting 5.7 volts at all coils which is incorrect.

This seems to be a common (and easy) mistake people are making when upgrading their rectifier boards and connectors.
Your original Stern rectifier board had an 8 pin plug for the playfield J1 connector. The replacement rectifier board you're using has 9 pins at the J1 playfield connector (1 extra pin). The three wires on the right of that J1 connector are in the wrong position and need to be moved left one position. The 9th pin (right most of J1) should be empty.

#5 3 months ago
Quoted from oldschoolbob:

check the fuse under the playfield?[quoted image]

Thank you. Fuse is good

#6 3 months ago
Quoted from Quench:

This seems to be a common (and easy) mistake people are making when upgrading their rectifier boards and connectors.
Your original Stern rectifier board had an 8 pin plug for the playfield J1 connector. The replacement rectifier board you're using has 9 pins at the J1 playfield connector (1 extra pin). The three wires on the right of that J1 connector are in the wrong position and need to be moved left one position. The 9th pin should be empty.

Thank you
I forgot about that!!!! Great catch, I'll fix it and report back!

Thanks again!

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