(Topic ID: 268296)

Transformer OK - Fan-Tas-Tic

By jclocomotion

3 years ago


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    #2 3 years ago

    Your credit unit wheel is way below zero and the pin actuating switches is too far into the switch. Now the switch lighting credit lamp at apron is shorted to the other witch, which allows game to be started if there are credits. This causes the 24V to short to the 6V and blow your fuses.

    Probably there is nothing wrong with the transformer, but you have measured incorrectly.

    #4 3 years ago

    The switches should both open when credits are at zero.

    Don't know how you are measuring, but it is very unlikely that both voltages would be that high. Only thing that could cause too high voltage at transformer output is a short in primary winding, which would require serious overheating of transformer. And even then, the 24V reading should be about 4x the 6V reading. My guess is you are measuring against some floating ground point, maybe the earth connection of 230VAC.

    #6 3 years ago

    On the credit unit, there is one switch that opens when credits are at maximum. This can be adjusted by moving the pin that actuates the switch. Then there are the other rwo switches that open when credits are at zero. It is not adjustable. Also, there is a switch that actuates when a credit is added. That is driving the knocker coil.

    Transformer voltage measurement should be done between the C terminal and the 6/24/high tap outputs, with your meter set at ACV. But remove the switch stack short (adjust the credit unit properly) before mesurements. You can measure the voltages even if the 24V or 6V fuses are not installed.

    The coil voltage can be either 24V, or about 27V if the wire is moved from 24 to the high tap. I dont recommend using the high tap, since the game was designed for 220 volts input, and we are already at 230V. Cleaning playfield and all mechanisms should result in nice game play with no need to raise the voltage. High tap was really meant for cases of lower than normal line voltage.

    #11 3 years ago

    The rectifier only gets power during game, not in game over state. 7V residual in filter capacitor from last game is normal. Why do you think there is a problem with the rectifier?

    #13 3 years ago

    Does the lock relay energize when you press the left button? Also, starting game or inserting coin should as well energize the relay. The power is on even with lock relay off, only the lamps are not powered. Since you shorted the 24V to 6V, all lamps may be burned out.

    #15 3 years ago

    Then your 24V fuse is probably open or not making contact with the holder. Does the score motor run if you manually turn it a bit forward? If not, then definitely the 24V is missing. And since 24V is present at transformer, it most certainly is the fuse.

    #18 3 years ago

    The lock relay and coin lockout coil are not energizing because the 24V is missing. It has nothing to do with the lock relay or credit unit. Check the 24V fuse and holder.

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