Sega NAOMI Universal Cabinet¶
The standard cabinet dedicated to the NAOMI (1998+): a Sega "universal" cabinet built to host the NAOMI board (and its carts/GD-ROMs) with JVS I/O and a 31 kHz monitor. Sega's official move into the JVS era.
Identification¶
| Field | Value |
|---|---|
| Manufacturer | Sega |
| Year | 1998 → (NAOMI era) |
| Type | Universal cabinet (system-dedicated upright) |
| System | Sega NAOMI (cartridge or GD-ROM via DIMM) |
| Screen | tri-sync CRT (accepts NAOMI 31 kHz) |
| I/O | JVS (modern serial standard) |
Technical notes¶
- Built for the NAOMI: board bay + JVS I/O board + video wiring compatible with 31 kHz (the NAOMI outputs VGA/31 kHz by default).
- JVS: no 56-pin JAMMA edge for the game → serial JVS I/O connected to the NAOMI's JVS board (a Sega 838-xxxx I/O board).
- GD-ROM support: for GD-ROM games, add the GD-ROM drive + DIMM board (decompression RAM) — see the NAOMI page.
- A "universal" cabinet: several artwork revisions/variants depending on games and regions.
⚡ Connector & power¶
| Aspect | Value |
|---|---|
| Year | 1999 — 29″ sit-down cabinet |
| Connector | JVS (serial) — no JAMMA for the game (Sega JVS I/O board) |
| Video | 31 kHz (NAOMI VGA output); EU chassis Sanwa 29E31S or Nanao MS-2932-S |
| System | NAOMI (cartridge / GD-ROM + DIMM) |
| Power | Sun 400-5397-1 PSU (close to a PC ATX), 110 V AC input (3-pin AMP Universal connector) |
| Weight | ~117 kg |
| Consumption | see the archived NAOMI Universal manual (exact specs inside) |
(Sources: Arcade Otaku + Hard*Candy + archived NAOMI Universal manual.)
→ Detailed wiring: a JVS cabinet → see JVS wiring and the JVS I/O board (Sega 837-13551, or 838-13683 JVS↔JAMMA to reuse a candy cab's JAMMA panel).
Common faults¶
| Symptom | Likely cause | Lead |
|---|---|---|
| Nothing on screen | NAOMI / DIMM / GD-ROM | NAOMI diagnosis (see its page) |
| Dead controls | JVS I/O / JVS harness | Check the JVS I/O board + cable |
| GD-ROM won't load | GD drive / DIMM / RTC battery | See NAOMI |
| Image (CRT) | tri-sync chassis, recap | Adjustments + recap |
Repair¶
- System side: everything happens on the NAOMI (RTC / anti-piracy battery, DIMM, GD-ROM).
- Monitor: 31 kHz tri-sync chassis → maintenance like the Nanao MS9.
- Power: Sega cabinet PSU → candy cab PSU.
Manuals (archived)¶
- 📘 NAOMI Universal manual (PDF)
(Source: Arcade Otaku Wiki, archived locally for preservation.)
Photos / assets¶
(To add: NAOMI Universal Cabinet, NAOMI bay, JVS I/O board, GD-ROM/DIMM.)
Repair & maintenance
Modernise (video, PSU, JVS, upscaler, PC/FPGA) → Modernising a cabinet. CRT monitor (discharge HV!) → CRT safety + Nanao MS8 / MS9 chassis · Sega candy PSU → PSU repair · recap → Recap.
Sources & attribution¶
- Arcade Otaku Wiki — Sega NAOMI Universal Cabinet — https://wiki.arcadeotaku.com/
- Internal page: Sega NAOMI (the hosted system)
Review & corrections
How this space is used
Spotted a wrong value, an outdated procedure, a chip reference that does not match your board? Say so here, with what you observed (model, board revision, serial number, measurement). Every report is cross-checked against a source before anything changes — an unverifiable correction is published as “reported by …, not cross-checked” rather than silently applied.
Reading is open to everyone; posting requires signing in with Discord. Reports from the wiki's declared reviewers are handled first; anyone else's are read too, but go through a human before anything is changed.