(Topic ID: 143518)

Haunted House Club: The Beautiful Beast

By davebart5

8 years ago


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#762 4 years ago

The segments from the playfield display and credit display are controlled bij Z23 (7448) on the MPU board (Group C segments). That one can be defective. Also take a look for a loose wire or a bad contact at the J2 connector on the MPU board.

3 years later
#1271 1 year ago

That board delivers the +30V for the Audio Amplifier and -12V for the DAC's and OpAmps. If the big capacitor is bad, it will result in a 100Hz (120 in the USA) humming sound. C2 has been replaced in the past, you can check the solderwork. It is easy to test the +30V and -12V presence at the soundboard when the audio powersupply is installed. You can also check for ripple with a multimeter in AC Voltage mode.

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