Carrier Airwing sound stops after a while

GF77

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May 8, 2025
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HI, as the title states. But there is another thing. When I bought it back in 1995 there was already a sticker at the JAMMA connector with 4.80V on it.

Now if I dial into exact 4.80V the sound seems to be working. But as soon as I go up with the voltage sound disappears after a few minutes and some sporadic "clicks" can be heard. The exact same click when I power on the PCB.

Could it be a capacitor issue?
 
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