(Topic ID: 255471)

Bally Elektra - no squawk nor talk

By Archieball

4 years ago



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#1 4 years ago

Hi,
My Bally Elektra lost the sound. The Squawk and Talk went from working to dead. When checking the voltages to the board I get zero volts at the -5V test point. There is -2,5ish on the connector at pin 7, and looking at the schematics the circuit has a "voltage doubler" so I'm guessing that the input value is correct.
Any thoughts?
Cheers,
Arch
Elektra (resized).pngElektra (resized).png

#2 4 years ago

The connector at pin7 should be from the GI bus, 6-8v AC. You might have been measuring dc voltage. How many flashes do you get on the led at startup? If you get 5, the board is booting and the -5v is present.

#3 4 years ago
Quoted from jj44114:

The connector at pin7 should be from the GI bus, 6-8v AC. You might have been measuring dc voltage. How many flashes do you get on the led at startup? If you get 5, the board is booting and the -5v is present.

Yes, you are right, I measured DC so that might explain it.
I get four flashes on the led, and the -5VDC is not present at the test point.

#4 4 years ago

if you have the correct AC voltage at pin7, check the 2 330uf caps and and the two diodes. If they’re good, all that’s left is the 7905 regulator which I have seen fail on occasion.

#5 4 years ago

Thank you, sir. Will do.
When measuring the AC here there is no point in measuring to ground, is there? So it should be 6-8v AC between pin 7 and C37?

#6 4 years ago

Measure using the ground braid in the head.

#7 4 years ago

Solved! The S&T did indeed miss the GI voltage, and it turned out to be a bad connection at the molex coming from the light panel. I am yet again exposed to Elektra's radiation!

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