Mega CD / Sega CD Schematics
This page holds three A3-format Sega Enterprises, Ltd. drawing sets for the Mega CD and Mega CD 2. They are sheets cut from Sega service manuals, not manuals in themselves, and two of the three uploads are damaged — read the table before planning a repair around them.
None of the three carries a text layer.
The three files
| File | State | What is actually on the sheets |
|---|---|---|
| Mega CD Schematics (A3) | Damaged upload — 9 sheets readable, at least one lost | Mega CD (Model 1), sheets numbered 67 to 106 of a Sega service manual. Internal block diagrams of the Sega custom LSIs — the first sheet is "MAIN BOARD IC2 3/3" for part 315-5548 — followed by component-placement drawings. The last readable sheet is "IC BD MEGA-CD MAIN BD", Sega part 837-8015-01 (D-3/3), sub-assembly 610-5266-01, dated 1992, solder side, with a value printed against each fitted position and several marked NOT USED |
| Mega CD 2 Service Manual Schematics (A3) | Intact — 4 sheets | Mega CD 2, sections 9 to 12 of the service manual: block diagram, schematic diagram 2, main circuit board top and bottom views, and the start of the parts specifications (IC001 hex inverter, IC002 dual D-type flip-flop) |
| Mega CD 2 Supplement Schematics (A3) | Damaged upload — 5 sheets readable, at least one lost | Sega CD II schematic section, from page 3 onward: "2. SCHEMATIC DIAGRAM / 2-1. Schematic Diagram-1 [SEGA CD II]" — a full component-level main-board schematic showing the Sega custom 315-5632 Ver.ES5, an MC68HC000, an LC89515 and a 315-5476A, with values printed against components |
The damaged uploads
Two of the three files are truncated: they stop at an exact 4,096-byte boundary partway through an image stream, with no cross-reference table, no trailer and no end-of-file marker. A normal PDF viewer will refuse to open either of them.
- Mega CD Schematics A3.pdf — 32,501,760 bytes stored. Nine complete A3 sheets survive; the tenth sheet's image is cut off and is not recoverable from this upload.
- Mega CD 2 Supplement Schematics A3.pdf — 35,794,944 bytes stored. Five complete A3 sheets survive; the sixth sheet's image is cut off.
This is an upload fault, not a scanning fault — the missing bytes never reached the wiki. If a complete copy of either set is found it should replace the file here.
What is not here
- No parts list, no fault tree, no disassembly procedure, no specifications. These are drawing sheets only.
- No text layer on any of the three, so nothing in them is searchable.
- For a complete Model 1 document see the Sega CD Service Manual; for the Model 2, the Sega CD 2 / Mega CD 2 - Service Manual and its supplement.
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