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P4 documentation drive: rewrite doc-holder as a real documentation page - title as printed, manual number, issue date, contents with page numbers, honest gaps, and what the document settles; flags two truncated uploads in the Mega CD schematic set
Rewrite from the files: both damaged uploads now open (9 and 5 sheets); identify every sheet and its A4 page in the full manuals; download links for all three; remove em dashes and bold
 
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This page holds three A3-format Sega Enterprises, Ltd. drawing sets for the [[Sega CD (Model 1)|Mega CD]] and [[Sega CD (Model 2)|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.
The '''Mega CD / Sega CD Schematics''' are three sets of A3 drawing sheets from Sega Enterprises, Ltd. service documents for the [[Sega CD (Model 1)|Mega CD]] and [[Sega CD (Model 2)|Mega CD 2]]. Each is a large-format scan of pages that also appear, at A4, in one of the complete manuals: the [[Sega CD Service Manual]] for the Model 1, and the [[Sega CD 2 / Mega CD 2 - Service Manual|Mega CD 2 service manual No. 002]] and its [[Sega CD 2 / Mega CD 2 - Service Manual Supplement|supplement No. 002-2]] for the Model 2. The larger scans are easier to read at component level. None of the three files has a text layer.
 
None of the three carries a text layer.


== The three files ==
== The three files ==
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<templatestyles src="Template:StyledTable/styles.css" />
<templatestyles src="Template:StyledTable/styles.css" />
{| class="wikitable styled-table" style="width:100%; text-align:left;"
{| class="wikitable styled-table" style="width:100%; text-align:left;"
! File !! State !! What is actually on the sheets
|+'''A3 drawing sets'''
! File !! Sheets !! Contents !! Same pages at A4
|-
|-
| [[:File:Mega CD Schematics A3.pdf|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
| [[:File:Mega CD Schematics A3.pdf|Mega CD Schematics A3.pdf]] || 9 || Mega CD (Model 1), sheets numbered by hand 67 and 98 to 106. Sheet 67 is the block diagram of the main board's 315-5548 gate array ("MAIN BOARD IC2 3/3"). Sheets 98 to 101 are the main board schematic (PC BD MEGA-CD MAIN BD, assembly 837-8015-01, Sega drawing 171-6105C-01 rev. A, 31 March 1992, four sheets). Sheet 102 is the sub board (837-8046-01, drawing 171-6115C rev. C, 9 December 1991) and sheet 103 the connect board (839-0436, drawing 171-6132C rev. C, 9 December 1991). Sheets 105 and 106 are the main board mount diagrams, component side and solder side, with values against the fitted positions || [[Sega CD Service Manual]], PDF pages 70, 101 to 106, 108 and 109
|-
|-
| [[:File:Mega CD 2 Service Manual Schematics A3.pdf|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)
| [[:File:Mega CD 2 Service Manual Schematics A3.pdf|Mega CD 2 Service Manual Schematics A3.pdf]] || 4 || Mega CD 2, sections 9 to 12 of service manual No. 002 (August 1993): block diagram, schematic diagrams 1 and 2, main circuit board top and bottom views, and the start of the parts specifications (IC001 hex inverter, IC002 dual D-type flip-flop) || [[Sega CD 2 / Mega CD 2 - Service Manual]], pages 15 to 18
|-
|-
| [[:File:Mega CD 2 Supplement Schematics A3.pdf|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
| [[:File:Mega CD 2 Supplement Schematics A3.pdf|Mega CD 2 Supplement Schematics A3.pdf]] || 5 || Sega CD II and Mega CD II, pages 3 to 12 of supplement No. 002-2 (June 1994), for units from serial number T30282001: schematic diagram 1 (Sega CD II, with the 315-5632 Ver. ES5, MC68HC000, LC89515 and 315-5476A), schematic diagram 2 (Mega CD II), schematic diagram 3 (CD drive, CXD1167Q and CXA1082BQ), main circuit board top and bottom views, and the exploded view with the first page of the parts lists || [[Sega CD 2 / Mega CD 2 - Service Manual Supplement]], pages 3 to 12
|}
|}


== The damaged uploads ==
== Incomplete files ==
 
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.
The Mega CD file and the Mega CD 2 supplement file were truncated when uploaded, partway through an image, so each ends early: the Mega CD file after sheet 106, the supplement after page 12. The pages that are present are complete. The A4 manuals listed above have the rest.


== What is not here ==
== What these files do not contain ==


* '''No parts list, no fault tree, no disassembly procedure, no specifications.''' These are drawing sheets only.
* Parts lists, fault-finding charts, adjustment procedures or specifications, apart from the start of the Mega CD 2 supplement's parts list. Those are in the A4 manuals.
* '''No text layer on any of the three''', so nothing in them is searchable.
* The Model 1 sub board and connect board mount diagrams, which are in the [[Sega CD Service Manual]] (PDF pages 110 to 112).
* 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 [[Sega CD 2 / Mega CD 2 - Service Manual Supplement|supplement]].


== Pages that cite this document ==
== Pages that cite this document ==
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<pdf> File:Mega CD 2 Service Manual Schematics A3.pdf </pdf>
<pdf> File:Mega CD 2 Service Manual Schematics A3.pdf </pdf>
Downloads: [[:File:Mega CD Schematics A3.pdf|Mega CD Schematics A3.pdf]] (30.4 MB), [[:File:Mega CD 2 Service Manual Schematics A3.pdf|Mega CD 2 Service Manual Schematics A3.pdf]] (24.6 MB), [[:File:Mega CD 2 Supplement Schematics A3.pdf|Mega CD 2 Supplement Schematics A3.pdf]] (30.5 MB)


[[Category:Sega Schematics]]
[[Category:Sega Schematics]]

Latest revision as of 09:32, 1 October 2026

The Mega CD / Sega CD Schematics are three sets of A3 drawing sheets from Sega Enterprises, Ltd. service documents for the Mega CD and Mega CD 2. Each is a large-format scan of pages that also appear, at A4, in one of the complete manuals: the Sega CD Service Manual for the Model 1, and the Mega CD 2 service manual No. 002 and its supplement No. 002-2 for the Model 2. The larger scans are easier to read at component level. None of the three files has a text layer.

The three files

[edit | edit source]
A3 drawing sets
File Sheets Contents Same pages at A4
Mega CD Schematics A3.pdf 9 Mega CD (Model 1), sheets numbered by hand 67 and 98 to 106. Sheet 67 is the block diagram of the main board's 315-5548 gate array ("MAIN BOARD IC2 3/3"). Sheets 98 to 101 are the main board schematic (PC BD MEGA-CD MAIN BD, assembly 837-8015-01, Sega drawing 171-6105C-01 rev. A, 31 March 1992, four sheets). Sheet 102 is the sub board (837-8046-01, drawing 171-6115C rev. C, 9 December 1991) and sheet 103 the connect board (839-0436, drawing 171-6132C rev. C, 9 December 1991). Sheets 105 and 106 are the main board mount diagrams, component side and solder side, with values against the fitted positions Sega CD Service Manual, PDF pages 70, 101 to 106, 108 and 109
Mega CD 2 Service Manual Schematics A3.pdf 4 Mega CD 2, sections 9 to 12 of service manual No. 002 (August 1993): block diagram, schematic diagrams 1 and 2, main circuit board top and bottom views, and the start of the parts specifications (IC001 hex inverter, IC002 dual D-type flip-flop) Sega CD 2 / Mega CD 2 - Service Manual, pages 15 to 18
Mega CD 2 Supplement Schematics A3.pdf 5 Sega CD II and Mega CD II, pages 3 to 12 of supplement No. 002-2 (June 1994), for units from serial number T30282001: schematic diagram 1 (Sega CD II, with the 315-5632 Ver. ES5, MC68HC000, LC89515 and 315-5476A), schematic diagram 2 (Mega CD II), schematic diagram 3 (CD drive, CXD1167Q and CXA1082BQ), main circuit board top and bottom views, and the exploded view with the first page of the parts lists Sega CD 2 / Mega CD 2 - Service Manual Supplement, pages 3 to 12

Incomplete files

[edit | edit source]

The Mega CD file and the Mega CD 2 supplement file were truncated when uploaded, partway through an image, so each ends early: the Mega CD file after sheet 106, the supplement after page 12. The pages that are present are complete. The A4 manuals listed above have the rest.

What these files do not contain

[edit | edit source]
  • Parts lists, fault-finding charts, adjustment procedures or specifications, apart from the start of the Mega CD 2 supplement's parts list. Those are in the A4 manuals.
  • The Model 1 sub board and connect board mount diagrams, which are in the Sega CD Service Manual (PDF pages 110 to 112).

Pages that cite this document

[edit | edit source]

Downloads: Mega CD Schematics A3.pdf (30.4 MB), Mega CD 2 Service Manual Schematics A3.pdf (24.6 MB), Mega CD 2 Supplement Schematics A3.pdf (30.5 MB)

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