Sega Naomi Gd Rom Service Manual

1ST  PRINTING JUNE  01
MANUAL NO. 420-6620-02
SEGA ENTERPRISES, INC.  USA
NAOMI
GD-ROM SYSTEM
SERVICE MANUAL
TM 

Warranty
Your new Sega Product is covered for a period of 90 days from the date of shipment.  This certifies
that the Printed Circuit Boards, Power Supplies and Monitor are to be free of defects in workman-
ship or materials under normal operating conditions.   This also certifies that all Interactive Control
Assemblies are to be free from defects in workmanship and materials under normal operating condi-
tions.  No other product in this machine is hereby covered.
Sellers sole liability in the event a...

BEFORE USING THE PRODUCT, BE SURE TO READ THE FOLLOWING:
To maintain the safety:
To ensure the safe usage of the product, be sure to read the following before using the product.  The following
instructions are intended for the users, operators and the personnel in charge of the operation of the product.
After carefully reading and sufficiently understanding the warning displays and cautions, handle the product
appropriately.  Be sure to keep this manual nearby the product or elsewhere convenient for...

Specification changes (removal of equipment, conversion and addition) not designated by SEGA
are not allowed.
The parts of the product include warning labels for safety, covers for personal protection, etc.  It is very
hazardous to operate the product by removing parts and or modifying the circuits.  Should doors, lids
and protective parts be damaged or lost, refrain from operating the product, and contact where the
product was purchased from or the office herein stated.  SEGA shall not be held...

BEFORE USING THE PRODUCT, BE SURE TO READ THE FOLLOWING:
TABLE OF CONTENTS
INTRODUCTION OF THE SERVICE MANUAL
1.   HANDLING PRECAUTIONS .........................................................................   1
2.  SPECIFICATIONS OF NAOMI GD-ROM SYSTEM .....................................   2 - 6
        2 - 1    CABINET ............................................................................................   2
        2 - 2    NAOMI BD CASE AND FILTER BOARD...

INTRODUCTION OF THE OWNERS MANUAL
This Owners Manual is intended to provide detailed descriptions together with all
the necessary information covering the general operation of electronic assemblies,
electromechanicals, servicing control, spare parts, etc. as regards the product,
NAOMI GD-ROM SYSTEM.
This manual is intended for the owners, personnel and managers in charge of
operation of the product.  Operate the product after carefully reading and sufficiently
understanding the instructions.  If the...

DEFINITION OF LOCATION MAINTENANCE MAN AND SERVICEMAN
Non-technical personnel who do not have technical knowledge and expertise should
refrain from performing such work that this manual requires the locations
maintenance man or a serviceman to carry out, or work which is not explained in
this manual.  Failing to comply with this instruction can cause a severe accident
such as electric shock.
Ensure that parts replacement, servicing & inspections, and troubleshooting are performed by the
locations...

1
1.  HANDLING PRECAUTIONS

To prevent electric shock or IC Board malfunctioning, be sure to turn off the
power for the cabinet when installing or removing the IC Board.

Extraneous matter such as dust on the IC Board can cause the IC Board to
generate heat and result in a fire due to short circuit, etc.  Ensure the IC Board
surfaces are always kept clean.

Keep the IC board well cooled.
The NAOMI board case and GD-ROM drive are provided with ventilating
fans. Do not block the air outlets of these fans....

2
2.  SPECIFICATIONS OF NAOMI GD-ROM SYSTEM
2 - 1   CABINET
• Use the NAOMI GD-ROM system with the JVS-compatible cabinet.
• If you want to use the NAOMI GD-ROM system with the conventional JAMMA-compatible
cabinet, prepare the modification parts (power supply, I/O board, audio amplifier, etc.) and
thereby modify the cabinet into a JVS-compatible one.
• Contact a cabinet manufacturer or distributor to check whether or not:
- the cabinet is JVS-compatible and
- the cabinet can be modified into a...

3
2 - 2   NAOMI BD CASE AND FILTER BOARD
• NAOMI Main BD is contained in the Shield Case.
Use NAOMI in the status with the Main BD as is contained in the Shield Case.
• When using NAOMI, ensure that the Ventilation Ports and Heat Exhaust Fan opening are not
obstructed.
FIG. 2. 2 a
NAOMI SHIELD CASE VENTILATION PORT GD Cable Connector
DIMM BOARD CASE LEG BRACKET Key Chip Slot
FILTER BOARD HEAT EXHAUST FAN OPENING
FIG. 2. 2 b
CN1: POWER SUPPLY (JST VL 8P)  1: (N.C.)  2: +3.3V  3: +5V  4: +12V  5 ~ 8: GND...