Sega Naomi Gd Rom Service Manual

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2 - 3  MONITOR DIRECTION AND HORIZONTAL SCANNING FREQUENCY
• MONITOR DIRECTION
Install the monitor in the positional direction (horizontal or vertical as applicable) suitable
for each game.  For the monitor direction, refer to the attached manual of the specific game.
If the attached Instruction Manual dose not refer to the monitor direction, postion the
monitor in the horizontal direction.
HORIZONTAL
• HORIZONTAL SCANNING FREQUENCY : 15.85kHz / 31.69kHz
Which one of 15kHz or 31kHz frequency, or both of the frequencies does the game correspond
to depends on each game.  To find out the frequency the specific game corresponds to, refer to
the Instruction Manual attached to the game.
The frequency output can be designated by No. 1 SW of DIP SW on the Filter BD.
ON
1234
ON
1234
DIPSW 1 OFF
31kHz
DIPSW 1 ON
15kHz
For both of 15K and 31K, set DIP SW 2 ~ 3 to OFF unless
otherwise specified.
FIG. 2. 3  FILTER BOARD DIP SW
The actual DIP SW may differ from the above Figure.
Note that due to a certain flickering and blurring, the Interlace display may be slightly inferior
as compared to Non-interlace display.
Also, if the cabinet monitor is not corresponding to Interlace display, on-screen noise may
appear and display is not satisfactory.
Among the games corresponding to both 15k and 31k, there are some game for which the use of
31k is strongly recommended.  If such a game is displayed in 15k, WARNING may be
displayed at the time power is turned on.
At the time of the shipment of NAOMI Main BD, which one of 15k or 31k the DIP SW is set to
depends on the games contained in the same package.  Before installing in the cabinet, be sure
to check the setting contents of DIP SW, and change the DIP SW setting if necessary. 
						

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BCA
B
2 - 4  REPAIR/SERVICING AND CARTON BOX
When  transporting  the  NAOMI  board  (or  NAOMI  2  board)  and  the  GD-ROM  drive  for  repair/
servicing,  follow  the  instructions  below.  The  carton  box  (a  standard  accessory)  is  needed  when
transporting these components for repair/servicing. Carefully keep, therefore, the carton box.
• For repair/servicing, ship a set of the following parts:
NAOMI board case
DIMM board case
* Do not remove the key chip but leave it attached.
GD-ROM drive
* Remove the GD drive bracket.
* Remove the GD-ROM disk and carefully keep it in its case.
• Remove all the wire harnesses and cables from the NAOMI board case and the GD-ROM
drive before shipping them.
• Do not disassemble the NAOMI board case and the GD-ROM drive. Store them, just as they
are, in the carton box.
• Make a report to explain the detailed symptoms as well as the name of the game you played.
Send it to a repairer as instructed.
FIG. 2. 4 a
CARTON BOX
601-10532:NAOMI
601-11044:NAOMI 2
 "CHECK SIDE"Display:NAOMI
 "NAOMI 2"Display:NAOMI 2
FILTER BOARD
Projected portions of
the packing material.
Serial No. Display
Serial No. Display
1
2
3 
						

							6
FIG. 2. 4 b
CARTON BOX
601-11031
FIG. 2. 4 c
CARTON BOX
601-11030
Remove the GD drive bracket. 
						

							7
3.  ASSEMBLING THE NAOMI GD-ROM SYSTEM
Before starting to work, ensure that the Power SW is OFF.  Failure to observe this
can cause electric shock and short circuit hazards.
Assemble the NAOMI GD-ROM system as follows:
When the GD-ROM system is used with:
a standard cabinet that contains the NAOMI board:
a JVS-compatible standard cabinet:
The purchased NAOMI board case has come with the DIMM board?
Referring to the Section 3-1, "CHECKING THE BOOT ROM VERSION
NUMBER," check the version number. The boot ROM must be replaced?
Referring  to  the  Section  3-2,  "BOOT  ROM  REPLACEMENT,"  replace
the boot ROM.
Referring to the Section 3-3, "DETACHING/ATTACHING THE DIMM
BOARD CASE," attach the DIMM board.
Referring to the "GD-ROM System Modification Manual," install the GD-
ROM drive and connect the wires.
Referring to the Section 3-4, "KEY CHIP," attach the key chip.
Referring to the Section 3-5, "GD-ROM DISK," attach the GD-ROM disk.
Referring  to  the  Section  3-6,  "CONNECTING  THE  POWER,"  connect
the power.YES
YESNO
NO
1
2 
						

							8
When the GD-ROM system is used with a dedicated game cabinet:
Referring to the "Owner's Manual" attached with each game machine,
install the GD-ROM drive and connect the wires.
Referring to the Section 3-4, "KEY CHIP," attach the key chip.
Referring to the Section 3-5, "GD-ROM DISK," attach the GD-ROM
disk.
Referring to the Section 3-6, "CONNECTING THE POWER," connect
the power.
3 
						

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3 - 1  CHECKING THE BOOT ROM VERSION NUMBER
You can use the NAOMI main board for a GD-ROM system only if its boot ROM version
number is EPR-xxxxE or later. The five-digit version number is indicated on the sticker of the
boot ROM (IC27) of the NAOMI main board.
Visually check the boot ROM sticker and make sure that the version number is as follows:
EXAMPLE : EPR-XXXXXD X (Not usable for a GD-ROM system)
EPR-XXXXXE O (Usable for a GD-ROM system)
EPR-XXXXXF O (Usable for a GD-ROM system)
FIG. 3. 1
When the present boot ROM's version number is not EPR-xxxxD or before, replace the ROM
with a new one of EPR-xxxxE or later.
When the present boot ROM's version number is EPR-xxxxE or later, but not latest, replace the
ROM with a new one of the latest one.
Remember that the conventional ROM board is not usable even if it is attached with a GD-
ROM system compatible boot ROM of EPR-xxxxE or later.
The FIG 3.1 indicates the NAOMI board. The NAOMI 2 board is different in a position of the
boot ROM.
BOOT ROM
NAOMI MAIN BOARD
For the NAOMI boards:
This step 3-1 is necessary.
For the NAOMI 2 boards:
This step 3-1 is NOT necessary if the game machine is the one delivered in March
2001  or  before.  This  step  3-1  may  be  necessary  if  the  game  machine  is  the  one
delivered in April 2001 or after.STOP
IMPORTANT 
						

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3 - 2  BOOT ROM REPLACEMENT
Do  not  perform  this  work  unless  otherwise  particularly  instructed  due  to  BOOT  ROM  version
change, etc.
Remove on-socket ROM (IC27) of NAOMI Main BD from the socket by using an IC EXTRACTOR.
• To prevent tearing off on-board patterns, etc., do not used tools such as a flat-blade type screw-
driver,  etc.  other  than  the  IC  EXTRACTOR.    For  malfunctioning  resulting  from  using  tools
other than the IC EXTRACTOR, repair shall be performed on a pay-basis.  Be careful of this
point.
BOOT ROM
DO NOT USE A FLAT-BLADE SCREWDRIVER.
FIG. 3. 2 a
The ROM is a precision device. Handle it carefully because it may be damaged by
heat, shock, and static electricity.STOP
IMPORTANT
1 
						

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Insert a new ROM into a socket; be careful about an inserting direction in this instance.
• It may be uneasy to insert a ROM, because the width between the two lines of pins on both
ends may be larger than required. If this is the case, press the ROM pins onto a flat surface
and bend them; thus make the width smaller.
• When inserting the ROM, be very careful to insert it into a correct direction and not to break
its pins.
Inserting positions are shifted.
Inserting positions are shifted.
Inserted upside down.
FIG. 3. 2 b
These wrongly inserted ROMs may be damaged when connecting the power.
ROMNOTCH
NOTCHSOCKET
2 
						

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3 - 3  DETACHING/ATTACHING THE DIMM BOARD CASE
How to Attach
Contact the connectors with each other, and insert the DIMM board case into the NAOMI board
case; be careful about an inserting direction in this instance. Make sure that the DIMM board
case is seated firmly and completely.
Use the three M3 X 30 screws and one M3 X 70 screw that fix the DIMM board case onto the
NAOMI board case.
How to Detach
Remove the three M3 X 30 screws and one M3 X 70 screw that fix the DIMM board case onto
the NAOMI board case.
Hold the ends of the DIMM board case and remove it upwards from the NAOMI board case.
FIG. 3. 3
NAOMI BOARD CASE
DIMM BOARD CASE
SCREW (M3 X 30)SCREW (M3 X 70)
1
2
1
2 
						

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3 - 4  KEY CHIP

The key chip is a precision device. Handle it carefully because it may be
damaged by heat, shock, and static electricity.

The key chip is contained in the GD-ROM disk case. Always use them as a
set.
How to Attach
Remove the key chip from the GD-ROM disk case.
Insert the key chip vertically into the slot of the DIMM board case; be careful about an inserting
direction in this instance. Make sure that the key chip is seated firmly and completely.
How to Detach
Pressing the tab of the key chip, hold its end and remove it from the DIMM board case.
Keep the GD-ROM disk and the key chip as a set.
KEY CHIP
FIG. 3. 4
STOP
IMPORTANT
KEY CHIP
TAB
DIMM BOARD CASE
1
2
1
2