Editing N64 NUS-CPU-03-04 Schematic

<pdf> File:N64 NUS-CPU-03-04 Schematic.pdf </pdf>

The '''NUS-CPU-03/04 schematic''' is a single-sheet drawing of the Nintendo 64 mainboard, covering the NUS-CPU-03 and NUS-CPU-04 NTSC revisions. It was '''drawn by RDC in 2013''' by tracing a physical board: it is a community reconstruction, not a Nintendo document, because '''Nintendo published no service manual or schematic for the Nintendo 64.''' It is nonetheless the most complete circuit-level reference available for the machine.

The drawing marks the one block that is present on the '''-03 only'''.

== What it gives you ==

The power section is the most immediately useful part, because it settles several facts that are routinely stated wrongly:

{| class="wikitable styled-table" style="width:85%;"
|+'''Nintendo 64 power section'''
! Item !! On the drawing
|-
| '''P4''' — supply connector || '''+12 V''' and '''+3.3 V''' in, with three ground ways. '''No +5 V comes in from the brick'''
|-
| SW1 || Power switch, breaking '''both''' incoming rails
|-
| '''U13''' — 78M05 || Generates the board's own '''+5 V''' from the incoming +12 V
|-
| '''U12''' — PQ7VZ5 || Adjustable regulator producing the RDRAM supplies
|-
| '''Vterm''' || '''2.56 V'''
|-
| '''Vref''' || '''1.92 V'''
|-
| Divider || R25 130 Ω, R26 316 Ω, R27 301 Ω, R35 390 Ω
|-
| D3 || Power LED, from +3.3 V through R31 (75 Ω)
|-
| Fuse || '''None.''' P4 runs straight into the power switch
|}

Beyond the power section: the VR4300 CPU and the RCP with their full pin assignments, both RDRAM devices, the PIF, the cartridge connector, the four controller ports, the video DAC and audio output stages, the clock oscillators, and the capacitor and resistor designators across the board.

'''Every capacitor on the drawing is a surface-mount part.'''

== What it does not give you ==

* '''No component values for most positions.''' Designators are marked throughout, but values are given only where the drawing's author recorded them. It is not a substitute for a parts list — and no parts list exists for this machine.
* '''No PAL coverage.''' NUS-CPU(P) and NUS-CPU(R) boards differ and are not drawn here.
* '''Nothing outside the mainboard''' — the power supply, the controller and the paks are not covered.
* '''No board layout or component location map.''' You get the circuit, not a plan of where things sit.
* '''Pin numbering on P4 differs from some other published pinouts''', which is what happens when one drawing looks at the plug and another at the socket. '''Identify the N64's supply rails with a meter rather than by pin number.'''

== Download ==

Download the schematic here: [[:File:N64 NUS-CPU-03-04 Schematic.pdf]]

== Used by ==
* [[Nintendo 64]]
* [[Nintendo 64 Maintenance Guide]]
* [[Nintendo 64 Capacitor Replacement Guide]]
* [[Nintendo 64 Troubleshooting Guide]]

[[Category:Nintendo Schematics]]