(Topic ID: 210403)

Elektra GI Problems

By United555

6 years ago


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elektra-aux-driver (resized).png
Elektra (resized).jpg

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#3 6 years ago
Quoted from United555:

GI (Playfield) dosent work, Coindoor cabinet working - error maybe locayed to unknow component not appearing in the schematic...(photo)
Need advice, friend nearby also have a Elektra where everything works - what should I compare to find the error?
Would be nice, if you could explain what purpose/function of the identical components on the photo.
Where to start?
Michael/Brian

The things in the pic are triacs. One of them switches the playfield GI on and off, the other does the same for the mini-playfield GI.

Is the backbox GI (behind the backglass) working? Let us know. If yes, then the problem is somewhere in the circuit that drives the main playfield GI triac. If not, check the GI fuse on the rectifier board.

#4 6 years ago

Will assume the GI fuse is good since you said the coin door lights work. The circuit that drives the GI triac is an auxiliary driver, located under the playfield.
See the circled item in the attached pic. When you press the self-test button once for lamp test, the feature lights will flash off and on. Does the playfield GI flash also? If not, look for a 555 bulb in a socket, mounted near this driver board, under the playfield. It's easy to spot because it's not in a place where it lights anything on the playfield. Check that bulb, it should be flashing in lamp test. If not, check the bulb and the socket connection. The bulb is needed to allow the Aux. driver board to turn the triac on, which in turn lights the playfield GI.

#5 6 years ago

elektra-aux-driver (resized).pngelektra-aux-driver (resized).png

1 week later
#7 6 years ago

There is a playfield solenoid fuse under the playfield, near the right lower flipper. Check that fuse.

As for the triac getting hot, is the GI dim? If not, the triac is probably good. I recall that thermal grease is supposed to be applied to the area where the triac mounts to the power supply plate, to aid in heat transfer. I would unscrew the triacs from the mounting plate and apply some fresh thermal grease around the mounting holes, then re-install them.

#8 6 years ago

You mentioned that the GI is now "miraculously working". Well as you know, nothing ever fixes itself. You probably have a bad connection somewhere. I would check for cracks in the solder joints on the header pins of the Aux. board, and reflow with fresh solder. Also check that the 555 bulb (mentioned earlier) has a good connection in the socket. Inspect the solder connections on the triac too.

If the playfield GI fails again, look at the 555 bulb. If it is on, the problem is in the Aux. board, triac connections, or triac. If it is off, first make sure the bulb is good, then check the connections on J2 of the main lamp driver board. Pin 1 of J2 is the connection to the 555 bulb.

Hope this helps.

#10 6 years ago

Yes it could be the potentiometer. You should repost this question under a new topic. You'll get more responses from sound board experts that way.

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