NES-001 Schematic
The NES-001 schematic is a 2020 redraw of the NES-001 control deck mainboard on one B-size sheet. Its title block reads "NES Schematics", file Original_NES.sch, rev. 1.0, dated 2020-06-05, by N. Schenk (Schenktronics), drawn in KiCad 5.1.5. It is not a Nintendo document. The text in the PDF is searchable, unlike the scanned 1989 drawings hosted as NES Schematics.
Contents
[edit | edit source]The sheet is laid out in labelled blocks:
- Clock generator: the 21.47727 MHz crystal X1 with transistors Q2 and Q3, giving the CPU and PPU clocks.
- CIC: the 3193A lockout chip (U10) with its 4 MHz crystal X2. C6 and C7 are marked as not populated.
- The RP2A03 CPU (U6) and RP2C02 PPU (U5), the two TMM2115 2K static RAMs (U1 for work RAM, U4 for video RAM), the 74LS373 address latch (U2), the 74LS139 decoder (U3) and the 74HC04 inverter (U9).
- Controller inputs: connectors P4 and P5, the 74LS368 buffers U7 and U8, resistor network RA1 and the protection diode arrays DA1 to DA4. R14, R15 and R16 are marked as not populated.
- The 72-pin cartridge edge connector (EDGE1) and the 48-pin expansion port (AUX1), with every signal named.
- The audio mixing and output stage around U9E.
- The power and reset connector (P6), the 100 µF supply capacitor C1 and the decoupling capacitors, and the RF modulator connector (RF_MOD1).
Signal names are spelled out (CPU_A0 to CPU_A15, CPU_D0 to CPU_D7, CIRAM_A10, CIC_CLK, AUX_AUDIO_IN and so on), which makes nets easier to follow than on the 1989 scan. Values are marked against the designators.
What it does not contain
[edit | edit source]- A parts list or Nintendo part numbers.
- The inside of the RF modulator, which on the NES-001 also holds the power supply section and the audio, video and RF output stages; the sheet shows only the connector to it.[1]
- A board layout or component location drawing.
- PAL boards, the NES-101 top-loader or the Famicom.
- Fault-finding procedures or waveforms. Nintendo's are in the NOA Independent Servicer Technical Training Workbook, which also carries Nintendo's own control deck schematic.[1]
Pages that cite this document
[edit | edit source]- Nintendo Entertainment System: the clock generator (X1, Q2)
- Nintendo Entertainment System Capacitor Replacement Guide: the mainboard's capacitor positions and the values of C1, C9 and C23
Download: NES-001.pdf
References
[edit | edit source]- ↑ 1.0 1.1 Nintendo of America, World Class Service Authorized Servicer Technical Training Workbook (running header "NOA Independent Servicer Technical Training Workbook", Rev. 11/90). Hosted as NOA Independent Servicer Technical Training Workbook. Appendix B (PDF page 97): "Power Supply Section - Contained in the RF Modulator. Provides all of the operating voltages for the CPU PCB, gamepak and accessory devices"; the control deck schematic (PDF page 93) notes that the audio, video and RF output portions are also in the RF modulator.