Sega CD Service Manual
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.
| 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]- Sega CD (Model 1), Maintenance Guide, Troubleshooting Guide and Capacitor Replacement Guide
- Sega CD (Model 2)
- 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
- Battery Refurbishment
Download: Sega CD Service Manual.pdf