Proper audio calibration is essential for maintaining the authentic arcade experience. The most common techniques involve both hardware adjustments and software diagnostics. Technicians typically start with the simplest method: adjusting the volume control potentiometer (pot) located on the game's PCB or amplifier board. This is often the primary fix for overall volume issues.

For more precise calibration, many arcade PCBs feature built-in audio test modes accessible through the game's service menu. These modes generate specific test tones, allowing for accurate level setting and channel balance verification across stereo systems.

When audio is distorted or absent, technicians check the amplifier stage. This involves using a multimeter to test voltage levels on the amplifier chip and ensuring proper grounding. Replacing aging electrolytic capacitors on the audio circuit is another extremely common repair, as these components degrade over time and cause muffled or buzzing sound.

Direct speaker testing is also crucial. Technicians often substitute the cabinet's speaker with a known-working one to identify whether issues stem from the speaker itself or the upstream electronics. Finally, cleaning the edge connector that carries audio signals from the PCB to the cabinet speakers with a specialized contact cleaner can resolve intermittent audio or crackling sounds caused by oxidation. This systematic approach ensures the iconic sounds of arcade gaming are preserved accurately.