Editing Mega CD / Sega CD Schematics

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.

== The three files ==

<templatestyles src="Template:StyledTable/styles.css" />
{| class="wikitable styled-table" style="width:100%; text-align:left;"
|+'''A3 drawing sets'''
! File !! Sheets !! Contents !! Same pages at A4
|-
| [[: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.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.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 ==

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 ==

* 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 ==

* [[Sega CD (Model 1)]]
* [[Sega CD (Model 2)]]

<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]]