JVC XV-521BK User manual

SERVICE MANUAL
No.20836
XV-521BK/523GD
XV-525BK/421BK
XV-521BK/523GD
XV-525BK/421BK
Contents
Safety precautions
Importance administering
point on the safety
Dismantling and assembling
the traverse unit
Disassembly method
Precautions for service
Description of major ICs
1-2
1-3
1-4
1-5
1-15
1-16
VICTOR COMPANY OF JAPAN, LIMITED
OPTICAL DISC BUSINESS DIV. PERSONAL & MOBILE NETWORK BUSINESS UNIT
AV & MULTIMEDIA COMPANY 1644, Shimotsuruma, Yamato, Kanagawa 242-8514, Japan
DVD PLAYER
No.20836
Jun. 2000
COPYRIGHT 2000 VICTOR COMPANY OF JAPAN, LTD.
Printed in Japan
2000 06 (S)
XV-521BK/523GD
XV-525BK/421BK
J U.S.A
Area Suffix
XV-525BK/523GD
J U.S.A
C Canada
Area Suffix
XV-521BK
Area Suffix
XV-421BK

XV-521BK/523GD/525BK/421BK
1-2
Safety Precautions
1. This design of this product contains special hardware and many circuits and components specially
for safety purposes. For continued protection, no changes should be made to the original design
unless authorized in writing by the manufacturer. Replacement parts must be identical to those
used in the original circuits. Services should be performed by qualified personnel only.
2. Alterations of the design or circuitry of the product should not be made. Any design alterations of
the product should not be made. Any design alterations or additions will void the manufacturer`s
warranty and will further relieve the manufacture of responsibility for personal injury or property
damage resulting therefrom.
3. Many electrical and mechanical parts in the products have special safety-related characteristics.
These characteristics are often not evident from visual inspection nor can the protection afforded
by them necessarily be obtained by using replacement components rated for higher voltage,
wattage, etc. Replacement parts which have these special safety characteristics are identified in
the Parts List of Service Manual. Electrical components having such features are identified by
shading on the schematics and by ( ) on the Parts List in the Service Manual. The use of a
substitute replacement which does not have the same safety characteristics as the recommended
replacement parts shown in the Parts List of Service Manual may create shock, fire, or other
hazards.
4. The leads in the products are routed and dressed with ties, clamps, tubings, barriers and the
like to be separated from live parts, high temperature parts, moving parts and/or sharp edges
for the prevention of electric shock and fire hazard. When service is required, the original lead
routing and dress should be observed, and it should be confirmed that they have been returned
to normal, after re-assembling.
5. Leakage currnet check (Electrical shock hazard testing)
After re-assembling the product, always perform an isolation check on the exposed metal parts
of the product (antenna terminals, knobs, metal cabinet, screw heads, headphone jack, control
shafts, etc.) to be sure the product is safe to operate without danger of electrical shock.
Do not use a line isolation transformer during this check.
Plug the AC line cord directly into the AC outlet. Using a "Leakage Current Tester", measure
the leakage current from each exposed metal parts of the cabinet , particularly any exposed
metal part having a return path to the chassis, to a known good earth ground. Any leakage
current must not exceed 0.5mA AC (r.m.s.)
Alternate check method
Plug the AC line cord directly into the AC outlet. Use an AC voltmeter having, 1,000 ohms
per volt or more sensitivity in the following manner. Connect a 1,500 10W resistor paralleled by
a 0.15 F AC-type capacitor between an exposed
metal part and a known good earth ground.
Measure the AC voltage across the resistor with the
AC voltmeter.
Move the resistor connection to eachexposed metal
part, particularly any exposed metal part having a
return path to the chassis, and meausre the AC
voltage across the resistor. Now, reverse the plug in
the AC outlet and repeat each measurement. voltage
measured Any must not exceed 0.75 V AC (r.m.s.).
This corresponds to 0.5 mA AC (r.m.s.).
Warning
1. This equipment has been designed and manufactured to meet international safety standards.
2. It is the legal responsibility of the repairer to ensure that these safety standards are maintained.
3. Repairs must be made in accordance with the relevant safety standards.
4. It is essential that safety critical components are replaced by approved parts.
5. If mains voltage selector is provided, check setting for local voltage.
Good earth ground
Place this
probe on
each exposed
metal part.
AC VOLTMETER
(Having 1000
ohms/volts,
or more sensitivity)
1500 10W
0.15 F AC TYPE
!
CAUTION
Burrs formed during molding may be left over on some parts of the chassis. Therefore,
pay attention to such burrs in the case of preforming repair of this system.

XV-521BK/523GD/525BK/421BK
1-3
Caution: For continued protection against risk of
fire, replace only with same type 1.6A/250V for F901.
This symbol specifies type of fast operating fuse.
Precaution: Pour eviter risques de feux, remplacez
le fusible de surete de comme le meme type que
1.6A/250V pour F901.
Ce sont des fusibles suretes qui functionnes rapide.
Importance administering point on the safety
For USA and Canada / pour Etats - Unis d' Amerique et Canada
F901

XV-521BK/523GD/525BK/421BK
1-4
Dismantling and assembling the traverse unit
1. Notice regarding replacement of optical pickup
Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged,
can destroy the laser diode in the traverse unit (optical pickup). Take care to prevent this when performing
repairs to the optical pickup or connected devices.
(Refer to the section regarding anti-static measures.)
1. Do not touch the area around the laser diode and actuator.
2. Do not check the laser diode using a tester, as the diode may easily be destroyed.
3. It is recommended that you use a grounded soldering iron when shorting or removing the laser diode.
Recommended soldering iron: HAKKO ESD-compatible product
4. Solder the land on the optical pickup's flexible cable.
Note : Short the land after shorting the terminal on the flexible cable using a clip, etc., when using an
ungrounded soldering iron.
Note : After shorting the laser diode according to the procedure above, remove the solder according
to the text explanation.
Shorting
Shot with the clip

XV-521BK/523GD/525BK/421BK
1-5
Remove the four screws A on both side of the body.
Remove the two screws B on the back of the body.
Lift up the rear part of the top cover while pulling the
lower part of the sides, then detach upward.
1.
2.
3.
Disassembly method
< Main body>
Removing the top cover (See Fig.1)
Prior to performing the following procedure, remove
the top cover.
Remove the seven screws C on the back of the
body.
1.
Removing the rear panel (See Fig.2)
Fig.1
Fig.2
Top cover
Rear panel
B
C
C
A
2
A 2
C
C

XV-521BK/523GD/525BK/421BK
1-6
Prior to performing the following procedure, remove
the top cover.
by hand
Turn over the body. Insert a screwdriver into the hole
of the bottom chassis and turnit. The loading tray will
be ejected out of the front panel assembly.
Pull the loading tray toward the front.
Remove the fitting upward from the loading tray at
the joints b.
Push and return the loading tray.
1.
2.
3.
4.
Removing the fitting (See Fig.3 to 6)
To remove the front panel assembly
and the DVD mechanism assembly,
remove the fitting in advance.
ATTENTION:
Front panel
Front panel assembly
Loading tray
Hole
Bottom chassis
(Bottom)
Fig.3
Fig.4
Fig.5
Fig.6
Front panel assembly
Fitting
Joint b
Joint b
Loading tray
Loading tray
Front panel assembly
DVD mechanism assembly
TRAY OPEN

XV-521BK/523GD/525BK/421BK
1-7
Prior to performing the following procedure, remove
the top cover and the fitting.
Disconnect the card wire from connector CN703 on
the main board.
Turn over the body and remove the screw D
attaching the front panel assembly.
Release the five joints c on both sides and bottom of
the body and remove the front panel assembly
toward the front.
1.
2.
3.
Removing the front panel assembly
(See Fig.7 to 10)
The connector CN832 on the front
panel assembly and CN971 on the AC
jack board will be disconnected at the
same time.
ATTENTION: Fig.7
Fig.8
Fig.9
Fig.10
Main board
D
DC mechanism assembly
AC jack board
Front panel assembly
CN703
CN971
Joint c Joint c
Front panel assembly
Joint c
Front panel assembly
Joint c

XV-521BK/523GD/525BK/421BK
1-8
Prior to performing the following procedure, remove
the top cover and the front panel assembly.
Disconnect the card wire from connector CN101 on
the DVD Servo.
Disconnect the harness from connector CN031 on
the DVD mechanism assembly.
Remove the screw E on the rear left part of the
loading tray.
From the front side of the DVD mechanism
assembly, move the lever d in the direction of the
arrow and pull out the loading tray.
Remove the two screws F on the upper side of the
DVD mechanism assembly. Then release the two
joints e and detach the clamper base back-upward.
Remove the three screws G attaching the DVD
mechanism assembly.
1.
2.
3.
3.
4.
5.
Removing the DVD mechanism assembly
(See Fig.11 to 14)
Fig.11
Fig.12
Fig.13
Fig.14
Loading tray
Loading tray
CN101
CN101
Joint e Joint eClamper base
P031
Lever d
DVD Servo
DVD mechanism assembly
P031
DVD mechanism assembly
DVD mechanism assembly
E
F
G
GG
F
CN101
DVD mechanism assembly

XV-521BK/523GD/525BK/421BK
1-9
Prior to performing the following procedure, remove
the top cover and the front panel assembly.
Remove the two screws H attaching the AC jack
board.
Remove the two screws C on the rear panel.
Disconnect connector CN951 and CN961 on the AC
jack board from CN704 and CN705 on the main
board respectively.
1.
2.
3.
Removing the AC jack board
(See Fig.15 and 16)
Prior to performing the following procedure, remove
the top cover.
Remove the screw I attaching the DVD Servo.
Pull out the DVD Servo from the fix f while pinching
the fix f.
Disconnect connector CN501, CN502 and CN503 on
the DVD Servo from CN601, CN701 and CN706 on
the main board respectively.
1.
2.
3.
Removing the DVD Servo
(See Fig.17 and 18)
Fig.15
Fig.16
Fig.17
Fig.18
C
I
H
H
CN951 / CN705
CN961 / CN704
Rear panel
CN501 / CN706
DVD Servo
DVD Servo
Main board
CN503 / CN701CN502 / CN701
CN101
Fix f
Fix f
Main boardAC jack board

XV-521BK/523GD/525BK/421BK
1-10
Prior to performing the following procedure, remove
the top cover, the front panel assembly, the DVD
mechanism assembly, the AC jack board and the
DVD Servo .
Remove the three screws J attaching the main
board.
Remove the two screws C on the rear panel.
1.
2.
Removing the main board
(See Fig.19 and 20)
Unsolder connector FW841 on the power switch
board on the back of the front panel assembly.
Remove the two screws K attaching the power
switch board.
Push the two tabs g in the direction of the arrow and
remove the power switch board.
1.
2.
3.
Removing the power switch board
(See Fig.21)
Unsolder soldering i on the search switch board.
Remove the three screws M.
Release the four tabs j in the direction of the arrow
and remove the search switch board.
1.
2.
3.
Removing the search switch board
(See Fig.20)
Unsolder connector FW802 and soldering h on the
LCD board.
Remove the four screws L attaching the LCD board.
1.
2.
Removing the LCD board (See Fig.22)
Prior to performing the following procedure, remove
the top cover and the front panel assembly.
<Front panel assembly>
Fig.19
Fig.20
Fig.21
Fig.22
J
Main board
J
C
K
K
L
M
M
LLL
J
Rear panel
Power switch board
Front panel assembly
FW841
FW802
hi
Tabs j 4
Tabs g
Front panel assemblySearch switch board
LCD board

XV-521BK/523GD/525BK/421BK
1-11
Remove the screw A and the spring on the upper
side of the loading base assembly.
Move the rear part of the traverse mechanism unit
upward and pull backward to release the two joints a
with the base chassis.
1.
2.
<DVD mechanism>
Removing the traverse mechanism unit
(See Fig.1 and 2)
Move the cam plate on the upper side of the loading
base assembly in the direction of the arrow.
Remove the belt from the motor pulley.
Remove the two screws B attaching the loading
motor.
Turn over the loading base assembly and release the
loading motor board from the three tabs b while
spreading them outward. The loading motor board
will be detached with the loading motor.
Unsolder soldering c on the loading motor board and
remove the loading motor.
1.
2.
3.
4.
5.
Removing the loading motor / loading
motor board (See Fig.3 and 4)
When reattaching, engage the two
joints a and make sure the front
springs and the four insulators of the
traverse mechanism unit are correctly
attached.
ATTENTION:
To remove the loading motor board only,
unsolder soldering c on the loading motor and
release the three tabs b.
Ref.:
Fig.1
Fig.2
Fig.3
Fig.4
A
A
B
B
Traverse mechanism unit
Spring
Spring
Loading motor board
Loading motor
Belt
Cam plate
c
Tab b
Tab b
Tab b
Joints a
Joints a
Spring and Insulator
Spring and Insulator
Insulator

XV-521BK/523GD/525BK/421BK
1-12
It is not necessary to remove the traverse
mechanism unit.
Solder soldering d on the flexible board next to the
pickup unit.
From the bottom of the traverse mechanism unit,
disconnect the flexible wire from CN10 on the pickup
board.
1.
2.
Remove the screw C attaching the shaft stopper (R)
on the upper side of the traverse mechanism unit.
Pull the side of the shaft stopper (R) outward to
release the joint e and remove it upward. Remove
the skew spring at the same time.
Move the shaft in the direction of the arrow to release
it from the part f.
Release the joint g with the shaft and remove the
pickup with the shaft.
Pull out the shaft.
Remove the screw D attaching the switch actuator.
3.
4.
5.
6.
7.
Removing the pickup (See Fig.5 to 9)
Disconnecting the flexible wire without
soldering may cause damage to the
pickup.
ATTENTION: Fig.5
Fig.6
Fig.7
Fig.8Fig.9
Pickup unit
Flexible board
Flexible wire
Pickup unit
Shaft stopper (R)
Shaft stopper (R)
Shaft stopper (R)
Skew spring
Shaft
Shaft
Shaft
Pickup
Switch actuator
Shaft
Joint g
Joint e
Part f
Pickup board
CN10
d
C
C
D

XV-521BK/523GD/525BK/421BK
1-13
It is not necessary to remove the traverse
mechanism unit.
Solder soldering d on the flexible board next to the
pickup unit.
From the bottom of the traverse mechanism unit,
disconnect the flexible wire from CN10 on the pickup
board.
1.
2.
Unsolder soldering h, i and j of each harness on the
pickup board.
Remove the screw E attaching the pickup board and
release the two joints k.
3.
4.
Removing the pickup board
(See Fig.5 and 10)
Disconnecting the flexible wire without
soldering may cause damage to the
pickup.
ATTENTION:
Prior to performing the following procedure, remove
the traverse mechanism unit.
Solder soldering d on the flexible board next to the
pickup unit.
From the bottom of the traverse mechanism unit,
disconnect the flexible wire from CN10 on the pickup
board.
1.
2.
Unsolder soldering h of the motor harness on the
pickup board.
Remove the two screws F attaching the feed motor
assembly and remove the thrust spring. Move the
feed motor assembly in the direction of the arrow to
pull it out from the feed holder.
3.
4.
Removing the feed motor assembly
(See Fig.5, 10 and 11)
Disconnecting the flexible wire without
soldering may cause damage to the
pickup.
ATTENTION:
Fig.10
Fig.11
Pickup board
Feed motor assembly
Feed motor assembly
Thrust spring
Feed holder assembly
CN10
i
j
h
Joint k
Joint k
E
F
Fig.5
Pickup unit
Flexible board
d
F

XV-521BK/523GD/525BK/421BK
1-14
Prior to performing the following procedure, remove
the traverse mechanism unit.
Solder soldering d on the flexible board next to the
pickup unit.
From the bottom of the traverse mechanism unit,
disconnect the flexible wire from CN10 on the pickup
board.
1.
2.
Unsolder soldering i and j of the harness extending
from the turning table assembly to the pickup board.
Remove the screw G attaching the shaft stopper (F)
on the upper side of the traverse mechanism unit.
Pull the side of the shaft stopper (F) outward to
release the joint l and remove it upward. Remove the
spring at the same time.
Remove the screw H attaching the turn table
assembly.
Move the turn table assembly outward and pull out
from the shaft. Then remove it from the base chassis.
3.
4.
5.
6.
Removing the turn table assembly
(See Fig.5, 10, 12 and 13)
Disconnecting the flexible wire without
soldering may cause damage to the
pickup.
ATTENTION:
Fig.12
Fig.13
Fig.10
Pickup board
Feed motor assembly
Turn table assembly
Turn table assembly
Shaft stopper (F)
Shaft stopper (F)
Shaft
Shaft
Joint l
Shaft stopper (F)
CN10
i
j
h
Joint k
Joint k
E
G
H
H
G
G
Fig.5
Pickup unit
Flexible board
d

XV-521BK/523GD/525BK/421BK
1-15
Precautions for Service
Handling of Traverse Unit and Laser Pickup
1. Do not touch any peripheral element of the pickup or the actuator.
2. The traverse unit and the pickup are precision devices and therefore must not be subjected to
strong shock.
3. Do not use a tester to examine the laser diode. (The diode can easily be destroyed by the
internal power supply of the tester.)
4. To replace the traverse unit, pull out the metal short pin for protection from charging.
5. When replacing the pickup, after mounting a new pickup, remove the solder on the short land
which is provided at the center of the flexible wire to open the circuit.
6. Half-fixed resistors for laser power adjustment are adjusted in pairs at shipment to match the
characteristics of the optical block.
Do not change the setting of these half-fixed resistors for laser power adjustment.
Destruction of Traverse Unit and Laser Pickup by Static Electricity
Laser diodes are easily destroyed by static electricity charged on clothing
or the human body. Before repairing peripheral elements of the traverse
unit or pickup, be sure to take the following electrostatic protection:
1. Wear an antistatic wrist wrap.
2. With a conductive sheet or a steel plate on the workbench on which
the traverse unit or the pick up is to be repaired, ground the sheet
or the plate.
3. After removing the flexible wire from the connector (CN101),
short-circuit the flexible wire by the metal clip.
4. Short-circuit the laser diode by soldering the land which is provided
at the center of the flexible wire for the pickup.
After completing the repair, remove the solder
to open the circuit.
Shorting
When replacing the Mechanism Unit, turn ON the laser switch that is
located at the lower of the pick up after replacement.

XV-521BK/523GD/525BK/421BK
1-16
AK93C45AF-W (IC791) : CMOS EEPROM
AK93C45AF
1
2
3
4
8
7
6
5
NC
YCC
CS
SK
NC
GND
DO
DI
1.Pin Layout
Symbol
CS
SK
DI
DO
Vcc
GND
NC
Function
Chip Select
Serial Clock Input
Serial Data Input
Serial Data Output
Power Supply
Ground
Non connection
2.Pin Functions
EEPROM
1024bit
64 X 16
R/W AMPS
AND
AUTO ERASE
16
16
DATA
REGISTER
ADD.
BUFFERS
DECODER
VPP SW
VPP
GENERATOR
VREF
INSTRUCTION
DECODE.
CONTROL
AND
CLOCK
GENERATION
INSTRUCTION
REGISTER
DI
CS
SK
DO
3.Block Diagram
Description of major ICs

XV-521BK/523GD/525BK/421BK
1-17
INSTRUCTION
REGISTER INSTRUCTION
DECODE,
CONTROL
AND
CLOCK
GENERATION ADD.
BUFFERS
DATA
REGISTER 16 R/W AMPS
AND
AUTO ERASE
16
DECODER
EEPROM
4096bit
256 x 16
VPP SW
VREF
VPP
GENERATOR
DO
DI
CS
SK
PE
1
2
3
4
PE
VCC
CS
SK
NC
GND
DO
DI
8
7
6
5
8 PIN SOP
Pin no. Symbol
1 PE
2 VCC
3 CS
4 SK
5 DI
6 DO
7 GND
8 NC
Function
Program enable (With built-in pull-up resistor)
Power supply
Chip selection
Cereal clock input
Cereal data input
Cereal data output
Ground
No connection
NOTE : The pull-up resistor of the PE pin is about 2.5M (VCC=5V)
AK93C65AF-X (IC403) : EEPROM
1.Terminal layout
2.Block diagram
3.Pin function

XV-521BK/523GD/525BK/421BK
1-18
AN8702FH
PC1
PC01
PC2
PC02
TGBAL
TBAL
FBAL
POFLT
DTRD
IDGT
STANDBY
SEN
SCK
STDI
RSEL
JLINE
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
RFINN
RFINP
TESTSG
AGCO
AGCG
PEAK
BOTTOM
RFENV
BDO
OFTR
DCRF
RFC
VCC3
RFOUT
RFDIFO
GND3
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
HDTYPE VIN12 VIN11 GND1 VIN4 VIN3 VIN2 VIN1 VREF1 VCC1 VIN10 VIN9 VIN8 VIN7 VIN6 VIN5
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
TEN
TEOUT
ASN
ASOUT
FEN
FEOUT
VSS
TG
VDD
GND2
VREF2
VCC2
VHALF
DFLTON
DFLTOP
DSFLT
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
AN8702FH (IC101) : Front end processor
1.Terminal Layout
Pin No. Symbol I/O Function
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
PC1
PC01
PC2
PC02
TGBAL
TBAL
FBAL
POFLT
DTRD
IDGT
STANDBY
SEN
SCK
STDI
RSEL
JLINE
TEN
TEOUT
Tangential phase balance control terminal
Tracking balance control terminal
Focus balance control terminal
Track detection threshold value level terminal
Data slice part data read signal input terminal (For RAM)
Data slice part address part gate signal input terminal (For RAM)
Standby mode control terminal
SEN (Serial data input terminal)
SCK (Serial data input terminal)
STDI (Serial data input terminal)
Tracking error signal output terminal
I
I
I
O
I
I
I
I
I
I
O
2.Pin Functions

XV-521BK/523GD/525BK/421BK
1-19
Pin No. Symbol I/O Function
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
ASN
ASOUT
FEN
FEOUT
VSS
TG
VDD
GND2
VREF2
VCC2
VHALF
DFLTON
DFLTOP
DSFLT
GND3
RFDIFO
RFOUT
VCC3
RFC
DCRF
OFTR
BDO
RFENV
BOTTOM
PEAK
AGCG
AGCO
TESTSG
RFINP
RFINN
VIN5
VIN6
VIN7
VIN8
VIN9
VIN10
VCC1
VREF1
VIN1
VIN2
VIN3
VIN4
GND1
VIN11
VIN12
HDTYPE
Focus error output amplifier reversing input terminal
Focus error signal output terminal
Ground
Tangential phase error signal output terminal
Apply 3V
Ground
VREF2 voltage output terminal
Apply 5V
VHALF voltage output terminal
Ground
Apply 5V
All addition amplifier capacitor terminal
OFTR output terminal
RF envelope output terminal
Bottom envelope detection filter terminal
Peak envelope detection filter terminal
AGC amplifier gain control terminal
TEST signal input terminal
RF signal positive input terminal
RF signal negative input terminal
Focus input of external division into two terminal
Focus input of external division into two terminal
l
Apply 5V
VREF1 voltage output terminal
External division into four (DVD/CD) RF input terminal1
External division into four (DVD/CD) RF input terminal2
External division into four (DVD/CD) RF input terminal3
External division into four (DVD/CD) RF input terminal4
Ground
I
O
-
O
-
-
O
-
O
-
-
O
O
O
O
O
O
I
I
I
I
I
I
I
I
I
-
O
I
I
I
I
-
I
I

XV-521BK/523GD/525BK/421BK
1-20
Clock
Generator
Row
address
buffer &
Refresh
counter
Bank B
Bank A
Row decoder
Sense amplifier
Column decoder
& latch circuit
DQM
Command decoder
Control logic
Column
address
buffer &
burst
counter Data counter
Latch circuit
Input & output buffer
DQ
Mode
register
CLK
CKE
CS
RAS
CAS
WE
Address
1
2,3
4
5,6
7
8,9
10
11,12
13
14
15
16
17
18
19,20
21~24
25
26
27~32
33
34
35
36
37
38
39,40
41
42,43
44
45,46
47
48,49
50
VCC
DQ0,1
VSS
DQ2,3
VDD
DQ4,5
VSS
DQ6,7
VCC
LDQM
WE
CAS
RAS
CS
A11,10
A0~3
VCC
VSS
A4~9
NC
CKE
CLK
UDQM
NC
VCC
DQ8,9
VSS
DQ10,11
VDD
DQ12,13
VSS
DQ14,15
VSS
Power supply
Data input/output
Connect to GND
Data input/output
Power supply
Data input/output
Connect to GND
Data input/output
Power supply
Lower DQ mask enable
Write enable
Column address strobe
Row address strobe
Chip enable
Address inputs
Address inputs
Power supply
Connect to GND
Address inputs
Non connect
Clock enable
System clock input
Upper DQ mask enable
Non connect
Power supply
Data input/output
Connect to GND
Data input/output
Power supply
Data input/output
Connect to GND
Data input/output
Connect to GND
Pin No. Symbol Description Pin No. Symbol Description
2.Pin function
HY57V161610DTC8 or KM416S1120DT-G8 (IC504,IC505) : 16MB SDRAM
1.Block diagram