(Topic ID: 297576)

1976 Chicago Coin Jukebox "F" target insert won't light

By Darth_Human

1 year ago

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  • 3 posts
  • 3 Pinsiders participating
  • Latest reply 1 year ago by baldtwit
  • No one calls this topic a favorite


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#1 1 year ago

I bought this 1976 Chicago Coin Jukebox (the 4-player version of Sound Stage) about half a year ago when it was broken. I got it working, then decided to tear down the playfield, paint it and clearcoat it. After doing so I reassembled the playfield and started to test game functionality.
Everything worked except when I hit the "F" target, it shorted the GE lighting and started to burn something so I turned it off. I checked the schematic and read it only goes through "F" playfield relay board.

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So I replaced the relay, turned on the game and it did the same thing. Instead of turning it off I wiggled the relay box and it no longer shorts the game, and the relay does function now, but the light does not light.
I know it not a light bulb or socket issue because I disconnected the wires to the "F" light socket and the "D" light socket and purposefully shorted each to so see if I could narrow down the problem. The "D" will short but the "F" socket will not short. So even with the "F" relay locked the wire giving power to the socket will not short when I ground it. I have replaced the relay, what else can it be?

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#2 1 year ago

So if you jump the F socket to another lit socket, the bulb does light.
Did you check one of the other Relays (C,D,E) with a volt meter
to see which terminal is the 6V, then checked the terminal in the
same position on the F Relay to see if it's pushing out 6V. If it is,
then a little jumping should narrow things down. If it's not, then something
in the box lost connection and you'll want to jump a wire to that F terminal's
circuit so it pushes out 6V.

#3 1 year ago

here's more info.

what happens if you jumper the Y-BLU wire on the lamp socket directly to the green wire (on the transformer or one side of the playfield GI lights)?

if jumpering turns on the F light, what happens if you close the E relay?

if jumpering doesn't turn on the F light but the playfield GI lights dim, remove the F lamp and try again. If the playfield GI is still affected, then one of:

1] the F lamp socket has a short
2] the E or F relay switches with the Y-BLU wire have a short
3] the Y-BLU wire itself has a problem ... like it got squashed under a unit when you screwed stuff back on the playfield and the insulation got sliced thru ... however, if that happened the F and/or double bonus when lit lights would be on or burned out. If the E/F relays aren't on the playfield, check Y-BLU wire on the plugs.
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