Sega NAOMI 2 User manual

BEFORE USING THE PRODUCT, se sure to revo THE FOLLOWING:
To maintain the safety:
To
ensure
the safe usage ofthe 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 ofthe
operation ofthe 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 referring
to
it
when necessary.
Herein, explanations which require special attention
are
enclosed with dual lines. Depending
on
the
potentially hazardous degrees, the terms ofDANGER, WARNING, CAUTION, etc.
are
used.
Be
sure
to understand the contents
of
the displays before reading the text.
Indicates that mishandling the Indicates that mishandling the
product by disregarding this product by disregarding this
pictograph
will
cause
severe
injury caution
will
cause
a
slight
or
death. hazardous situation which
can
DANGER CAUTION result in personal injury and
or
material damage.
Indicates that mishandling the
product by disregarding this
warning will cause a potentially
WARNING hazardous situation which can
result in death or serious injury.
For the safe usage ofthe product, the following pictographs are used:
Indicates "HANDLE WITH CARE." In order to protect the human body and
equipment, this display is attached
to
places where the Owner's Manual and
or
Service
Manual should be referred to.
connect
it
to
the Ground.
)Indicates a "Protective Earth Terminal." Before operating the equipment, be sure to
O. Perform
work
in
accordance with the instructions herein stated.
Instructions for work are explainedby paying attention to the aspect of accident prevention.
Failing
to
perform work as per the instructions
can
cause
accidents. In the
case
where only
those who have technical expertise should perform the work to avoid hazardous situation, the
instructions herein state that the serviceman should perform such work.
OBe
sure
to
turn
off power before working
on
the machine.
To prevent electric shock, be
sure
to
turn
off
power before starting the work in which the
worker touches the interior ofthe product.
If
the work is to be performed in the power-on
status, the Instruction Manual herein always states to that effect.
OBe
sure
to
ground the Earth Terminal (this, however, is
not
required in the
case
where
a
power cord with earth is used).
This product is equipped with the Earth Terminal. When installing the product, Connect the
Earth Terminal to the "accurately grounded indoor earth terminal" by using
an
earth wire.
Unless the product is grounded appropriately, the
user
can
be subject to electric shock. After
performing repair, etc. for the Control equipment,
ensure
that the Earth Wire is firmly
connected to the Control equipment.
OEnsure that the Power Supply used is equipped with
an
Earth Leakage Breaker.
This product does
not
incorporate the Earth Leakage Breaker. Using
a
power supply which is
not
equipped with the Earth Leakage Breaker
can
cause
a
fire when earth leakage
occurs.
OBe
sure
to
use
fuses which meet the specified rating. (only for the machines which
use fuses).
Using fuses exceeding the specified rating
can
cause
a
fire and electric shock.

O. 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 responsible for any accidents, compensation for damage
to
athird
party, resulting from the specifications
not
designated by SEGA.
OEnsure that the product
meets
the requirements of appropriate Electrical
Specifications.
Before installing the product, check for Electrical Specifications. SEGA products have
a
nameplate
on
which Electrical Specifications
are
described. Ensure that the product is
compatible with the power supply voltage and frequency requirements ofthe location. Using
any Electrical Specifications different from the designated Specifications
can
cause
a
fire and
electric shock.
OInstall and operate the product in places where appropriate lighting is
available, allowing warning labels to be clearly read.
To
ensure
safety for the customers, labels and printed instructions describing potentially
hazardous situation
are
applied
to
places where accidents
can
be caused. Ensure that where
the product is operated has sufficient lighting allowing the warnings
to
be read.
If
any label is
peeled off, apply
it
again immediately. Please place
an
order with where the product
was
purchased from or the office herein stated.
OWhen handling the Monitor, be very careful. (Applies only
to
the product
w/monitor.)
Some
of
the monitor (TV) parts
are
subject to high tension voltage. Even after turning
off
power,
some
portions
are
still subject to high tension voltage sometimes. Monitor repair and
replacement should be performed only by those technical personnel who have knowledge
of
electricity and technical expertise.
O Be sure to adjust the monitor (projector) properly. (Applies only to the product
w/ monitor.)
Do
not
operate the product leaving
on-screen
flickering
or
blurring as
it
is. Using the product
with the monitor not properly adjusted may cause dizziness or a headache to an operator, a
player,
or
the customers.
O When transporting or reselling this product, be sure to attach this manual to
the product.
In the case where commercially available monitors and printers are used in this product, only
the contents relating
to
this product
are
explained herein. Some commercially available
equipment has functions and reactions not stated in this manual. Read this manual together
with the specific Instruction Manual ofsuch equipment.
*
Descriptions herein contained may be subject
to
improvement changes without notice.
¢
The contents described herein
are
fully prepared with due
care.
However, should any
question arise
or
errors
be found, please contact SEGA.
INSPECTIONS IMMEDIATELY AFTER TRANSPORTING THE PRODUCT TO THE LOCATION.
Normally, at the time ofshipment, SEGA products
are
inastatus allowing for usage
immediately after transporting to the location. Nevertheless,
an
irregular situation may
occur
during transportation. Before turning
on
power, check the following points to
ensure
that the
product has been transported inasatisfactory status.
Are there any dented portions or defects (cuts, etc.) on the external surfaces ofthe cabinet?
Are Casters and Adjusters, damaged?
Do the power supply voltage and frequency requirements meet with those ofthe location?
Are all wiring connectors correctly and securely connected? Unless connected in the correct
direction, connector connections can not be made accurately. Do not insert connectors
forcibly.
Do power cords have cuts and dents?
Do the fuses used meet specified rating? Is the Circuit Protector in
an
energized status?
Are all accessories available?
Can aDoors and Lids be opened with the Accessory keys? Can Doors and Lids be firmly
closed?
OOOO
OOOO

TABLE OF CONTENTS
BEFORE USING THE PRODUCT, BE SURE TO READ THE FOLLOWING:
TABLE OF CONTENTS
INTRODUCTION OF THE SERVICE MANUAL
1. HANDLING PRECAUTIONS
2.2...
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1
2.
SPECIFICATIONS OF NAOMI 2
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5
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2—2 NAOMI 2BD CASE AND FILTER BOARD ...........eeeeeeeee 3
2—3 MONITOR DIRECTION AND HORIZONTAL SCANNING FREQUENCY
.......
4
2—4 REPAIR/SERVICING AND CARTON BOX ......sceeeeeeeeeeees 5
3. ASSEMBLING THE NAOMI 22... ...cccce cece cece cece cece eee eneeees 6
3
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6~7
3—2 REMOVING AND REINSTALLING THE ROM BD
............005.
8
3—3 ROM REPLACEMENT (ROM BD) ......-.-eeeceeeeeececeneees 9
3—4 BATTERY REPLACEMENT (NAOMI 2MAIN BD)
.............5.
10
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BS SOUND TES nessa ones x ee ee ee eid REN ee ee CO 18
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5-8
SYSTEM ASSIGQUEMTS
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19
6
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ASSES
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5—8 BACKUP DATA CLEAR .... sec eeeeee nce eevee ence eneeeees 26
B— 5COCK SEUTING qo oa ceacde emcee ser cones os en ee ew cee 26
5—10 DIMM BOARD TEST ....ccceeeeesccccceeeeteneeeeeeeeees 27
5—10 ROM BOARD TES! 0 sswwsmmaw cw asi tisw ois me 50m oi Wiais'sts ome = 27
5—11 GAME TEST MODE ...... ccc cunnsn ccc ceeenccceeceneccnees 28

INTRODUCTION OFTHESERVICEMANUAL
This Owner's 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 2.
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 product fails
to
function satisfactorily,
non-
technical personnel should under no circumstances touch the internal system. Please
contact where the product
was
purchased from.
Use ofthis product is unlikely
to
cause
physical injuries
or
damages to property. However,
where special attention is required this is indicated by athick line, the word "IMPORTANT"
and its sign in this manual.
Indicates that mishandling the product by disregarding this display
can
cause
the
product's intrinsic performance
not
to
be obtained, resulting in malfunctioning.
IMPORTANT
SEGA ENTERPRISES, INC. (U.S.A.)/CUSTOMER SERVICE
45133 Industrial Drive, Fremont, California 94538, U.S.A.
Phone :[phone]
Fax =: [phone]

DEFINITION OF LOCATION MAINTENANCE MAN AND SERVICEMAN
A\
WARNING
Non-technical personnel who do not have technical knowledge and
expertise should refrain from performing such work that this manual
requires the location's 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
location's maintenance man or the serviceman. It is instructed herein that particularly hazardous
work should be performed by the serviceman who has technical expertise and knowledge.
The location's maintenance
man
and serviceman
are
herein defined as follows:
"Location's Maintenance Man"
:
Those who have experience in the maintenance of amusement equipment and vending machines,
etc., and also participate in the servicing and control ofthe equipment through such routine work
as equipment assembly and installation, servicing and inspections, replacement of units and
consumables, etc. within the Amusement Facilities and or locations under the management ofthe
Owner and Owner's Operators ofthe product.
Activities of Location's Maintenance Man :
Assembly
&
installation, servicing
&
inspections, and replacement of units
&
consumables as
regards amusement equipment, vending machines, etc.
Serviceman :
Those who participate in the designing, manufacturing, inspections and maintenance service of
the equipment at an amusement equipment manufacturer.
Those who have technical expertise equivalent
to
that of technical high school graduates as
re-
gards electricity, electronics and or mechanical engineering, and daily take part in the servicing &
control and repair ofamusement equipment.
Serviceman's Activities :
Assembly & installation and repair & adjustments ofelectrical, electronic and mechanical parts of
amusement equipment and vending machines.

1. HANDLING PRECAUTIONS
1
@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.
WARNING @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 2board
case
and GD-ROM drive
are
provided with Heat
Exhaust Fan. Do not block the air outlets of these fans. Also do not
place anything closely to the NAOMI 2board
case
and GD-ROM drive.
Failure to observe these instructions may cause an overheating and
fire.
Gror Be sure to connect the IC Board and connectors completely .
Insufficient insertion can damage IC Board, etc.
IMPORTANT For the IC Board circuit inspection, only the use of Logic Tester is
permitted.
The
use
of ordinary testers is not permitted
as
these
can
damage the
IC Board.
Do not subject the IC Board to static electricity when installing the IC
Board in the cabinet or when connecting wire harness connectors to
the IC Board.
When soldering buttons, etc. to the wire harnesses, be
sure
to
remove
the wire harnesses from the IC Board
so
as
not to subject the IC Board
to heat.
Using NAOMI 2without the Shield Case
can
cause
electric
wave
trouble. Be sure to use NAOMI 2together with the accessory Shield
Case.
The monitor frequency corresponding to NAOMI 2is 15kHz
or
31kHz.
NAOMI 2 can not be used for the cabinet incorporating a monitor or
projector not corresponding to 15kHz
or
31kHz.
Use the NAOMI 2board with the JVS-compatible cabinet. Using it with
the non-JVS-compatible cabinet may
cause
an
overheating and fire.
Some parts
are
the
ones
designed and manufactured not specifically
for this game machine. The manufacturers may discontinue, or change
the specifications of, such general-purpose parts. If this is the case,
Sega cannot repair
or
replace
a
failed game machine whether
or
not
a
warranty period has expired.
@Concerning the display ofJAMMA VIDEO STANDARD:
JAMMA VIDEO STANDARD adopted by NAOMI is referred to as JVS. As against this
Standard, the conventional JAMMA STANDARD which employs 56P Edge Connectors
adopted by ST-V, etc. is displayed
as
Old JAMMA STANDARD.
The specific Manual attached to each game sometimes displays JVS as JV STANDARD, New
JAMMA STANDARD,
or
JAMMA 2STANDARD against OLD JAMMA STANDARD as
JAMMA STANDARD, JS, etc.
@The
contents
herein described
are
subject
to
change without notice.
—1-—

2. SPECIFICATIONS OF NAOMI 2
2—1 CABINET
* Use the NAOMI 2with 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 acabinet manufacturer
or
distributor
to
check whether
or
not:
-
the cabinet is JVS-compatible and
-
the cabinet
can
be modified into
a
JVS-compatible
one
and used with the GD-ROM
system.
-
Some games may require
not
only
a
JVS-compatible cabinet but also
a
dedicated control
panel.

2—2
NAOMI2BD CASE AND FILTER BOARD
*
NAOMI 2Main BD is contained in the Shield Case.
Use NAOMI
2in the status with the Main BD as is contained in the Shield Case.
*
When using NAOMI 2,
ensure
that the Ventilation Ports and Heat Exhaust Fan Opening
are
not
obstructed.
@NAOMI2 SHIELD CASE @VENTILATION PORT
@ROM BOARD CASE ©LEG BRACKET
@FILTER BOARD ©HEAT EXHAUST FAN OPENING
PSW2 PSWI DIPSW fl
l
(x5) gua [CN 2]
[@] [©] [c000} 839-1069
ILI
horxi9 TORK194
ae
—
Ss
aco
—
=
©
eo
e224
bos
FIG.
2.2b
CN1: POWER SUPPLY (JST
VL
8P) 1:(N.C.) 2:43.3V 3:45V 4:+12V
5~8:GND
CN2: POWER SUPPLY (IST
VL
6P) 1;(N.C.) 2:4+3.3V
3:45V
4~6:GND
CN3: RGB VIDEO OUTPUT (MINI D-SUB 15P)
CN4: STEREO-AUDIO OUTPUT(RCA PIN JACK FEMALE) RED: RIGHT WHITE: LEFT
CN5: STANDARD I/O (SERIES
A
TYPE) Connected
to
I/O BD via. USB Cable.
CN6
~
9,12: Normally
not
used.
TORX194,TOTX195: OPTIC FIBER CONNECTOR
Used for communication in-between plural NAOMI.
For application, refer to the Instruction Manual ofthe game for
communication play.
PSW1: Functions as TEST Button.
PSW2: Functions as SERVICE Button.
DIPSW: Used for image Frequency change, etc. Refer to 2-3 MONITOR DIRECTION AND
HORIZONTAL SCANNING FREQUENCY.
Oo
| OU
—-3-—

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 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 ofthe frequencies does the game correspond
to
depends
on
each game. To find
out
the frequency the specific game corresponds to, refer
to
the Manual attached
to
the game.
The frequency output
can
be designated by No. 1SW ofDIP SW
on
the Filter BD.
ON DIPSW 1OFF
.
=“7
a
Lo 2
ON DIPSW 1ON
15kHz
For both of 15K and 31K, set DIP SW 2
~
4
to
OFF
un-
{34less 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 comparedtoNon-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 agame is displayed in 15k, WARNING may be
displayed at the time power is turned
on.
At the time ofthe shipment of NAOMI 2Main 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 ofDIP SW, and change the DIP SW setting
if
necessary.
—4—

2—4 REPAIR/SERVICING AND CARTON BOX
When transporting NAOMI2
for
repair/servicing, follow the instructions below.
The accessory carton box is needed when transporting NAOMI2 for repair/servicing. Be sure
to safely store the Carton Box.
- When transporting NAOMI 2Main BD for the repair/servicing, ensure that the ROM BD
used is in
an
as is installed status.
When submitting the wire harness and cables for repair, they must be left removed from
NAOMI 2.
-
Do
not
disassemble NAOMI 2indiscriminately. When submitting
it
for repair, package
it
in
the carton box with its original condition kept.
- When putting NAOMI 2SHIELD CASE in the carton box, the Leg Bracket need not be
removed.
-
Write down the game you operated and details ofthe symptom
on
paper, and submit
it
to
the
designated destination ofrepair.
ot
wr E
Poe
.
: ou?
“i
Serial No. Display
FILTER BOARD Sf. Sa
Projected portions of
aS
the packing material.
Serial No. Display
FIG.
2.4
a

3. ASSEMBLING THE NAOMI 2
3—1 BOOT ROM REPLACEMENT
GroF @The ROM is
a
precision device. Handle it carefully because it may be
damaged by heat, shock, and static electricity.
IMPORTANT @Do not perform this work unless otherwise particularly instructed due to
BOOT ROM version change, etc.
(@ Remove on-socket ROM (IC27)
of
NAOMI 2Main BD from the socket by using
an
IC
EXTRACTOR.
: To prevent tearing off on-board patterns, etc., do not used tools such as aflat-blade type
screwdriver, etc. other than the IC EXTRACTOR. For malfunctioning resulting from using
tools other than the [C EXTRACTOR, repair shall be performed
on
apay-basis. Be careful
ofthis point.

(2) Insert
a
new
ROM intoasocket; be careful about
an
inserting direction in this instance.
*
It
may be uneasy
to
insert aROM, because the width between the
two
lines ofpins
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.
NOTCH >
VW
EPR-
XXXXXE ROM
UUUUUUUUUUUUUUUUU
UU
NOTCH —~> SOCKET
VW
nono
nnn
ve
OXOOKE
Inserting positions
are
shifted.
xX aHOKE Inserting positions
are
shifted.
xX TX 4Inserted upside down.
e BIG,3:.1 b
These wrongly inserted ROMs may be damaged when connecting the power.

3—2
REMOVING AND REINSTALLING THE ROM BD
How to Attach
@Contact the connectors with each other, and insert the ROM board case into the NAOMI 2
board case; be careful about
an
inserting direction in this instance. Make
sure
that the ROM
board case is seated firmly and completely.
(2) Use the four M3 X 30 screws that fix the ROM board case onto the NAOMI 2board case.
How to Detach
@Remove the four M3
X
30
screws
that fix the ROM board
case
onto the NAOMI 2board
case.
(@) Hold the ends ofthe ROM board case and remove it upwards from the NAOMI 2board case.
SCREW (4)
M3 X30
ROM BOARD CASE
WHEN INSTALLING,
BE CAREFUL
OF THIS DIRECTION!

3—3 ROM REPLACEMENT (ROM BD)
Do
not
perform this work unless otherwise particularly instructed due
to
game version change, etc.
@) Turn power off, and remove ROM BD Case from NAOMI 2Case by referring to 3-2
REMOVING AND REINSTALLING THE ROM BOARD above.
(2) Remove the 2tapping
screws
from the back of ROM BD Case to
remove
the ROM BD Case
from ROM BD.
(3) Remove ROM BD surface side on-socket ROM (IC22) from the socket by using an IC
EXTRACTOR.
To prevent tearing off on-board patterns, etc., do not use tools such as a flat-blade type
screwdriver, etc. other than the IC EXTRACTOR. For malfunctioning resulting from using
tools other than the IC EXTRACTOR, repair shall be performed on apay-basis. Be careful of
this point.
@Insert the
new
ROMs into the socket by paying attention
to
the inserting direction. In
accordance with the instructions of the supplier of new ROMs, take proper action to dispose of
the removed old ROMs by sending back, discarding after cutting offpins, or appropriately
storing, as applicable. When instructed to change JUMPER SW, change the Jumper SW in
accordance with the instructions.
(©) Reinstall ROM BD Case to ROM BD by paying attention to the correct direction ofROM BD
and
secure
with the 2tapping
screws
removed
as
per @) above.
©By referring to 3-2 REMOVING AND REINSTALLING THE ROM BOARD, reinstall ROM
BD Case to NAOMI 2Case.
TAPPING SCREW (2)
So 3X10
ROM BOARD ¥
BE CAREFUL OF THIS DIRECTION !
FIG. 3.3

3—4 BATTERY REPLACEMENT (NAOMI 2MAIN BD)
Except for special cases such as using up the battery, etc., do not perform this work.
(@) Turn power off, and
remove
ROM BD Case from NAOMI 2Case by referring
to
3-2 above.
(2) Carefully
remove
the battery
on
the Battery Holder ofNAOMI 2Main BD.
(3) With the positive pole facing upward, insert the
new
Battery (CR2032) into the Holder.
@By referring
to
3-2 REMOVING AND REINSTALLING THE ROM BD, reinstall ROM BD
Case
to
NAOMI 2Case.
Dispose the removed batteries according
to
the local laws and regulations.
NAOMI main Board Battery
SEGA PART No. 401-0054
SEGA PART NAME BATTERY CR2032/1F MATSUSHITA
BATTERY
sysae
-_

4. ERROR MESSAGE
In the following cases, ERROR MESSAGE is displayed at the time power is turned
on
and the
test mode is finished, and the game is
not
playable.
ERROR 01
[DISPLAY]
[CAUSE]
[COUNTERMEASURES]
ERROR 02
[DISPLAY]
[CAUSE]
[COUNTERMEASURES]
ERROR 03
[DISPLAY]
[CAUSE]
[COUNTERMEASURES]
ERROR 04
[DISPLAY]
[CAUSE]
[COUNTERMEASURES]
ERROR 01
THIS GAME IS NOT ACCEPTABLE
BY MAIN BOARD.
(1) The ROM BOARD (or DIMM BOARD) is not connected correctly to the
MAIN BD.
(2)The NAOMI 2ROM board is mounted on the NAOMI main board.
(1)First, turn power off, connect the ROM BD (or DIMM BOARD)
correctly.
If
the status is
not
improved yet, the board may be
malfunctioning.
(2)The NAOMI 2ROM board software cannot run with the NAOMI main
board. If you want to run the NAOMI 2ROM board software, replace the
NAOMI main board with the NAOMI 2main board.
ERROR 02
THIS GAME IS NOT ACCEPTABLE
BY MAIN BOARD.
A game of acertain country's version which is not compatible with the Main
BD is connected
to
the Main BD.
Connect
a
game of
a
country's version which is compatible with the Main
BD. Country setting change can not be performed in the TEST mode.
ERROR 03
BOARD MALFUNCTIONING.
Main board serial number cannot be read out.
With the ROM
or
DIMM
board attached
to
it, submit the main board for
repairing. (See Section 2-4.)
ERROR 04
BOARD MALFUNCTIONING.
DIMM
board
or
ROM board serial number cannot be read out.
Submit the NAOMI 2board with the DIMM board or ROM board for
repairing.

ERROR 21
[DISPLAY]
[CAUSE]
[COUNTERMEASURES]
ERROR 22
[DISPLAY]
[CAUSE]
[COUNTERMEASURES]
ERROR 23
[DISPLAY]
[CAUSE]
[COUNTERMEASURES]
ERROR 24
[DISPLAY]
[CAUSE]
[COUNTERMEASURES]
ERROR 25
[DISPLAY]
[CAUSE]
[COUNTERMEASURES]
ERROR 26
[DISPLAY]
[CAUSE]
[COUNTERMEASURES]
ERROR 21
THIS GAME IS NOT ACCEPTABLE BY
MAIN
BOARD.
Game data (loaded from the GD-ROM
to
the
DIMM
board)
are
corrupted.
Make
sure
that the GD-ROM drive is firmly connected to the NAOMI 2
board.
Make
sure
that the GD-ROM disk is
not
scratched
or
contaminated.
ERROR 22
COMMUNICATION ERROR OCCURRED BETWEEN MAIN BOARD
AND OPTION BOARD.
The NAOMI 2main board receives no responses from the DIMM board.
Correctly reconnect the DIMM board and the GD interface board. If the
problem is still reproduced, replace the DIMM board and/or the GD
interface board.
ERROR 23
GD-ROM DRIVE COVER IS OPEN.
The GD-ROM drive
cover
is open.
Close the
cover
firmly.
ERROR 24
GD-ROM IS NOT FOUND.
The NAOMI 2GD-ROM disk
can
not
be recognized.
Reinsert the NAOMI 2GD-ROM disk.
Make
sure
that the GD-ROM disk is
not
scratched
or
contaminated.
ERROR 25
CAN NOT ACCESS GD-ROM DRIVE.
(1)The GD-ROM drive can not be accessed.
(2)The GD-ROM drive cover is open.
(1)Correctly reconnect the GD cable and power cord
to
the GD-ROM drive.
If
the problem is still reproduced, replace the GD-ROM drive.
(2) Close the cover firmly.
ERROR 26
OPTION BOARD MALFUNCTIONING.
The NAOMI 2board key chip can not be recognized.
Make sure that you are using a correct key chip that meets the GD-ROM
disk (If not so, change the present key chip with a correct one). Also make
sure that the key chip is firmly inserted.