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Contents from the PDF: add repair flow chart, check-cartridge error list and Mega-CD Checker sections (page said it had no fault tree); full electrolytic list for main and sub boards; drive unit and adaptor part numbers; citing pages
 
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The document behind this page is titled, on its own cover, '''''MEGA-CD Maintenance Manual, Export''''' — with the inner title page reading '''''MEGA-CD Maintenance Manual, Europe''''' — dated '''August 1992, Rev. A''', 118 pages, Sega Enterprises, Ltd. It is the European/export manual for the first-generation [[Sega CD (Model 1)|Mega CD]]; the page title here uses the American name for the same machine.
The '''Sega CD Service Manual''' hosted here is Sega Enterprises, Ltd.'s ''MEGA-CD Maintenance Manual'', August 1992, Rev. A, for the first-generation [[Sega CD (Model 1)|Mega CD]]. The cover reads "Export" and the title page "Europe"; the boards and accessories it lists are the export versions. The scan is 118 pages with a text layer. The page title uses the American name for the machine.


It is by a wide margin the most complete Sega document on this wiki for the Model 1 unit, and it goes all the way down to PCB copper layers.
It covers the unit down to component level on all three of its boards (main, sub and connect), with parts lists, schematics, mount diagrams and copper artwork.


The scan carries a text layer.
== Contents ==


== Contents ==
Sega's index is on PDF pages 2 and 3, with page numbers written in by hand. The PDF page on which each section starts is given here.


<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;"
! Section !! Page
|+'''MEGA-CD Maintenance Manual contents'''
! Section !! PDF page !! What it covers
|-
|-
| 1. Block diagram ||  
| 1. Block diagram || 4 ||
|-
|-
| 2. Assembly drawing — 2-1 general reference number list || 4
| 2. Assembly drawing || 6 || 2-1 general reference number list; 2-2 assembly lists for 1001 top case, 1002 side cover and side knob, 1003 side cover, 1004 CD-ROM unit shield, 1005 main board, 1006 CD drive unit and sub board, 1007 bottom shield and front cover; 2-3 disassembly and assembly procedure (p. 23)
|-
|-
| 2-2. Assembly list: 1001 top case; 1002 side cover and side knob; 1003 side cover; 1004 CD-ROM unit shield; 1005 main board; 1006 CD drive unit and sub board; 1007 bottom shield and front cover || 5–19
| 3. Spare parts list || 25 || Europe. Includes the CD drive unit, 610-5270 (Sony KSK-1200A), and the three boards
|-
|-
| 2-3. Procedure of disassembly and assembly || 20–31
| 4. Accessories list || 27 || Europe. AC adaptors 400-5122A and 400-5122B (AC 220 V, DC 10 V 1.2 A) and 400-5127 and 400-5127A (AC 240 V, DC 10 V 1.2 A)
|-
|-
| 3. Spare parts list ||
| 5. PCB repair procedure || 29 || A module-level flow chart (p. 30) that leads to the main board, the Mega Drive, the CD unit, the FFC cable between main and sub boards, the plug cord, the AC adaptor or the sub board
|-
|-
| 4. Accessories list ||
| 6. Soft and hard check manual || 31 || Check cartridge and check CD procedure with an error message list (pp. 38-40), then the manual for the Mega-CD Checker, part 610-0276, in Japanese with English error names (pp. 41-63)
|-
|-
| 7. IC pin assignments — main board IC1/IC2, IC3, IC6, IC7/IC8, IC10/IC11, IC13, IC14/IC15; sub board IC1, IC2, IC3/IC4/IC5 ||
| 7. Parts specification || 64 || Pin data for main board IC1, IC2, IC3, IC6, IC7/IC8, IC10/IC11, IC13 and IC14/IC15, and sub board IC1, IC2 and IC3 to IC5
|-
|-
| 8. Parts list of PCB — 8-1 IC BD MEGA-CD MAIN BD EXPORT; 8-2 IC BD MEGA-CD SUB BD EXPORT; 8-3 ASSY MEGA-CD CONNECT BD EXPORT || 84–96
| 8. Parts list of PCB || 93 || 8-1 IC BD MEGA-CD MAIN BD EXPORT (837-8952); 8-2 IC BD MEGA-CD SUB BD EXPORT (837-8953); 8-3 ASSY MEGA-CD CONNECT BD EXPORT (839-0534)
|-
|-
| 9. Schematic diagram — 9-1 main board; 9-2 sub board; 9-3 connect board || 91–103
| 9. Schematic diagram || 100 || Main board (four sheets), sub board and connect board
|-
|-
| 10. Mount diagram — component side and solder side for all three boards || 104–109
| 10. Mount diagram || 107 || Component and solder sides of all three boards
|-
|-
| 11. PCB design spec — copper layer artwork, component side and solder side, for all three boards || 110–115
| 11. PCB design spec. || 113 || Copper layers, component and solder sides, of all three boards
|}
|}


== What this manual settles ==
== What this manual settles ==


* '''The Mega CD Model 1 is three boards, not one''': a '''main board''', a '''sub board''' and a '''connect board'''. Each has its own parts list, its own schematic and its own mount diagram. A capacitor list for this machine that does not say which board a designator belongs to is ambiguous.
* The Model 1 Mega CD has three boards, each with its own parts list, schematic and mount diagram, and each numbers its parts from 1. A designator such as C41 means nothing without the board name.
* '''The IC complement of the main board''', with pin assignments for each: IC1/IC2 HD68HC000CP-12 and the Sega custom '''MCE2 MB634120, part 315-5548'''; IC3 custom '''RF5C164A, part 315-5476A'''; IC6 MB3790; IC7/IC8 TC511664BZ-80; IC10/IC11 TC51832FL-10; IC13 LC8951; IC14/IC15 MB8464A-80. On the sub board: IC1 LC7883KM, IC2 LC7881M-C, IC3/IC4/IC5 µPC844G2.
* Main board ICs: IC1 HD68HC000CP-12; IC2 the Sega custom MCE2, MB634120, part 315-5548; IC3 the custom RF5C164A, part 315-5476A; IC6 MB3790; IC7 and IC8 TC511664BZ-80; IC10 and IC11 TC51832FL-10; IC13 LC8951; IC14 and IC15 MB8464A-80. Sub board: IC1 LC7883KM, IC2 LC7881M-C, IC3 to IC5 µPC844G2.
* '''The Model 1 boards use a plain interleaved <code>C</code> sequence with no <code>CE</code> series''' — C1 through C58 in one run, with the electrolytics named in the description column (for example C41–C50 are 10 µF 16 V, Sega 150-0400 / 150-0400-01, and C51/C52 are 100 µF 6.3 V radial, 150-0401). This matches the [[Mega Drive Maintenance Manual - PAL-G, August, 1992, Rev. A|Mega Drive Model 1]] convention, not the Model 2 one.
* Electrolytic capacitors, from the parts lists (pp. 96 and 98):
* '''Two part numbers are given for the same position''' in places — 150-0400 and 150-0400-01 for C41–C50 — which is Sega recording a second approved vendor, not a contradiction.
** Main board: C41 to C50, 10 µF 16 V chip electrolytics (150-0400, or the alternative 150-0400-01); C51 and C52, 100 µF 6.3 V radial (150-0401). C53, C54 and C56 to C58 are not used.
** Sub board: C1 to C14, 10 µF 16 V radial (150-0402); C40 and C42, 100 µF 6.3 V 105 °C (150-0404); C41, 100 µF 6.3 V radial (150-0401); C43, 100 µF 16 V (150-0059). C36 to C39 are not used.
** Connect board: none. Its only capacitors are eighteen 150 pF ceramic chips.
* Unlike the Mega Drive boards, these lists group capacitors by type in consecutive designator runs, and the run of identical electrolytics at C41 to C50 is what Sega's list gives. The part number series still marks the dielectric: 150-xxxx electrolytic, 151-xxxx ceramic.


== What this manual does not contain ==
== What this manual does not contain ==


* '''No fault tree or symptom table.''' This is a maintenance and parts manual: assemblies, disassembly, parts, schematics and board artwork. It does not tell you what a symptom means.
* A CD drive adjustment or alignment procedure. The [[Sega CD 2 / Mega CD 2 - Service Manual|Mega CD 2 manual]] has one for its own drive.
* '''No CD drive alignment or adjustment procedure.'''
* Component-level fault finding. The repair flow chart stops at module level, and the check-cartridge errors name a function or chip area.
* '''No Model 2 coverage.''' For the [[Sega CD (Model 2)]] see the [[Sega CD 2 / Mega CD 2 - Service Manual]].
* Anything on the [[Sega CD (Model 2)|Model 2]].
* Export/Europe machine only.


== Pages that cite this document ==
== Pages that cite this document ==


* [[Sega CD (Model 1)]]
* [[Sega CD (Model 1)]], [[Sega CD (Model 1) Maintenance Guide|Maintenance Guide]], [[Sega CD (Model 1) Troubleshooting Guide|Troubleshooting Guide]] and [[Sega CD (Model 1) Capacitor Replacement Guide|Capacitor Replacement Guide]]
* [[Sega CD (Model 1) Maintenance Guide]]
* [[Sega CD (Model 2)]]
* [[Sega CD (Model 1) Troubleshooting Guide]]
* [[Mega CD / Sega CD Schematics]], whose A3 Model 1 sheets are larger scans of PDF pages 70, 101 to 106, 108 and 109 of this manual
* [[Sega CD (Model 1) Capacitor Replacement Guide]]
* [[Battery Refurbishment]]


<pdf> File:Sega CD Service Manual.pdf </pdf>
<pdf> File:Sega CD Service Manual.pdf </pdf>

Latest revision as of 09:36, 1 October 2026

The Sega CD Service Manual hosted here is Sega Enterprises, Ltd.'s MEGA-CD Maintenance Manual, August 1992, Rev. A, for the first-generation Mega CD. The cover reads "Export" and the title page "Europe"; the boards and accessories it lists are the export versions. The scan is 118 pages with a text layer. The page title uses the American name for the machine.

It covers the unit down to component level on all three of its boards (main, sub and connect), with parts lists, schematics, mount diagrams and copper artwork.

Contents

[edit | edit source]

Sega's index is on PDF pages 2 and 3, with page numbers written in by hand. The PDF page on which each section starts is given here.

MEGA-CD Maintenance Manual contents
Section PDF page What it covers
1. Block diagram 4
2. Assembly drawing 6 2-1 general reference number list; 2-2 assembly lists for 1001 top case, 1002 side cover and side knob, 1003 side cover, 1004 CD-ROM unit shield, 1005 main board, 1006 CD drive unit and sub board, 1007 bottom shield and front cover; 2-3 disassembly and assembly procedure (p. 23)
3. Spare parts list 25 Europe. Includes the CD drive unit, 610-5270 (Sony KSK-1200A), and the three boards
4. Accessories list 27 Europe. AC adaptors 400-5122A and 400-5122B (AC 220 V, DC 10 V 1.2 A) and 400-5127 and 400-5127A (AC 240 V, DC 10 V 1.2 A)
5. PCB repair procedure 29 A module-level flow chart (p. 30) that leads to the main board, the Mega Drive, the CD unit, the FFC cable between main and sub boards, the plug cord, the AC adaptor or the sub board
6. Soft and hard check manual 31 Check cartridge and check CD procedure with an error message list (pp. 38-40), then the manual for the Mega-CD Checker, part 610-0276, in Japanese with English error names (pp. 41-63)
7. Parts specification 64 Pin data for main board IC1, IC2, IC3, IC6, IC7/IC8, IC10/IC11, IC13 and IC14/IC15, and sub board IC1, IC2 and IC3 to IC5
8. Parts list of PCB 93 8-1 IC BD MEGA-CD MAIN BD EXPORT (837-8952); 8-2 IC BD MEGA-CD SUB BD EXPORT (837-8953); 8-3 ASSY MEGA-CD CONNECT BD EXPORT (839-0534)
9. Schematic diagram 100 Main board (four sheets), sub board and connect board
10. Mount diagram 107 Component and solder sides of all three boards
11. PCB design spec. 113 Copper layers, component and solder sides, of all three boards

What this manual settles

[edit | edit source]
  • The Model 1 Mega CD has three boards, each with its own parts list, schematic and mount diagram, and each numbers its parts from 1. A designator such as C41 means nothing without the board name.
  • Main board ICs: IC1 HD68HC000CP-12; IC2 the Sega custom MCE2, MB634120, part 315-5548; IC3 the custom RF5C164A, part 315-5476A; IC6 MB3790; IC7 and IC8 TC511664BZ-80; IC10 and IC11 TC51832FL-10; IC13 LC8951; IC14 and IC15 MB8464A-80. Sub board: IC1 LC7883KM, IC2 LC7881M-C, IC3 to IC5 µPC844G2.
  • Electrolytic capacitors, from the parts lists (pp. 96 and 98):
    • Main board: C41 to C50, 10 µF 16 V chip electrolytics (150-0400, or the alternative 150-0400-01); C51 and C52, 100 µF 6.3 V radial (150-0401). C53, C54 and C56 to C58 are not used.
    • Sub board: C1 to C14, 10 µF 16 V radial (150-0402); C40 and C42, 100 µF 6.3 V 105 °C (150-0404); C41, 100 µF 6.3 V radial (150-0401); C43, 100 µF 16 V (150-0059). C36 to C39 are not used.
    • Connect board: none. Its only capacitors are eighteen 150 pF ceramic chips.
  • Unlike the Mega Drive boards, these lists group capacitors by type in consecutive designator runs, and the run of identical electrolytics at C41 to C50 is what Sega's list gives. The part number series still marks the dielectric: 150-xxxx electrolytic, 151-xxxx ceramic.

What this manual does not contain

[edit | edit source]
  • A CD drive adjustment or alignment procedure. The Mega CD 2 manual has one for its own drive.
  • Component-level fault finding. The repair flow chart stops at module level, and the check-cartridge errors name a function or chip area.
  • Anything on the Model 2.

Pages that cite this document

[edit | edit source]

Download: Sega CD Service Manual.pdf

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