Editing Nintendo 64 Maintenance Guide (section)

== Power Supply & Voltage Checks ==

The N64 uses an external '''power supply module''' (PSU), which can degrade with age.

=== Power Supply Health ===
* Inspect the PSU for swelling, cracks, or overheating.
* Measure output voltage with a multimeter:
{| class="wikitable styled-table" style="width:60%;"
! Output Pin !! Function !! Expected Voltage
|-
| Centre || +12 V DC || 11.8 – 12.3 V
|-
| Outer || GND || 0 V
|}
* If voltage is outside range or unstable, replace the PSU with a quality aftermarket or original Nintendo unit.

=== Console Power Circuit ===
* Check for signs of overheating or burnt smell near the power input.
* Inspect the internal voltage regulator IC (usually IC601) for signs of failure (discolouration, bulging).
* If the console fails to power on, verify the power switch for oxidation or wear.