Sony HCD-ZUX999 User manual

SERVICE MANUAL
Sony Corporation
Audio&Video Business Group
Published by Sony Techno Create Corporation
HCD-ZUX999
SPECIFICATIONS
COMPACT DISC RECEIVER
9-889-579-01
2009G04-1
© 2009.07
E Model
Ver. 1.0 2009.07
• HCD-ZUX999 is the tuner, CD, USB and
amplifier section in FST-ZUX999.
Amplifier section
The following measured at AC 127 V, 60 Hz
(Mexican model)
The following measured at AC 120, 220,
240 V, 50/60 Hz (Other models)
Front/Rear speaker:
Power output (rated):
160 W + 160 W (at 6 Ω, 1 kHz,
1% THD)
RMS output power (reference):
250 W + 250 W/250 W + 250 W
(per channel at 6 Ω, 1 kHz, 10%
THD)
Inputs
AUDIO IN 1, 2 L/R:
voltage 250 – 700 mV, impedance
47 kilohms
MIC: sensitivity 1 mV, impedance
10 kilohms
Outputs
i (Headphones):
accepts headphones with an
impedance of 8 Ωor more
FRONT/REAR SPEAKER:
Use only the supplied speaker
SS-ZUX999
USB section
Supported bit rate:
MP3 (MPEG 1 Audio Layer-3):
32 – 320 kbps, VBR
WMA: 48 – 192 kbps, VBR
AAC: 48 – 320 kbps
Sampling frequencies:
MP3 (MPEG 1 Audio Layer-3):
32/44.1/48 kHz
WMA: 44.1 kHz
AAC: 44.1 kHz
(USB 1 and USB 2) port: Type A
Maximum current: 500 mA – Continued on next page –
CD player section
System:
Compact disc and digital audio
system
Laser Diode Properties
Emission duration: Continuous
Laser Output*: Less than 44.6μW
* This output is the value measurement
at a distance of 200mm from the
objective lens surface on the Optical
Pick-up Block with 7mm aperture.
Frequency response:
20 Hz – 20 kHz
Tuner section
FM stereo, FM/AM superheterodyne tuner
Antenna:
FM lead antenna
AM loop antenna
Model Name Using Similar Mechanism New
Mechanism Type CDM74KF-F2BD82F-A
Base Unit Name BU-F2BD82F-A
Optical Pick-up Name KSM-215DHAP
• “WALKMAN” and “WALKMAN” logo are registered trademarks of
Sony Corporation.
• “Memory Stick” is a trademark of Sony Corporation.
• MPEG Layer-3 audio coding technology and patents licensed from
Fraunhofer IIS and Thomson.
• Windows Media is a registered trademark of Microsoft Corporation
in the United States and/or other countries.

HCD-ZUX999
2
UNLEADED SOLDER
Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size)
: LEAD FREE MARK
Unleaded solder has the following characteristics.
• Unleaded solder melts at a temperature about 40 °C higher
than ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350 °C.
Caution: The printed pattern (copper foil) may peel away if
the heated tip is applied for too long, so be careful!
• Strong viscosity
Unleaded solder is more viscous (sticky, less prone to flow)
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.
• Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.
NOTES ON CHIP COMPONENT REPLACEMENT
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
FLEXIBLE CIRCUIT BOARD REPAIRING
• Keep the temperature of soldering iron around 270 °C during
repairing.
• Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
• Be careful not to apply force on the conductor when soldering
or unsoldering.
SAFETY-RELATED COMPONENT WARNING!
COMPONENTS IDENTIFIED BY MARK 0OR DOTTED LINE
WITH MARK 0ON THE SCHEMATIC DIAGRAMS AND IN
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS
WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS
MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.
FM tuner section:
Tuning range:
87.5 – 108.0 MHz (50 kHz step)
Intermediate frequency: 10.7 MHz
AM tuner section:
Tuning range:
Latin American models:
530 – 1,710 kHz (10 kHz step)
531 – 1,710 kHz (9 kHz step)
Other models:
531 – 1,602 kHz (9 kHz step)
530 – 1,610 kHz (10 kHz step)
Intermediate frequency: 450 kHz
General
Power requirements
Mexican model:
AC 127 V, 60 Hz
Other models:
AC 120, 220 or 230 – 240 V,
50/60 Hz, adjustable with voltage
selector
Power consumption
330 W
Dimensions (w/h/d) (excl. speakers)
Approx. 506 ×342 ×513 mm
Mass (excl. speakers)
Approx. 20.0 kg
Supplied accessories: Remote Commander
(1), R6 (Size AA) batteries (2), FM lead
antenna (1), AM loop antenna (1), Speaker
cords (4)
Design and specifications are subject to
change without notice.

HCD-ZUX999
3
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous radia-
tion exposure.
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
The laser diode in the optical pick-up block may suffer electro-
static break-down because of the potential difference generated by
the charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.
NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to be focused
on the disc reflective surface by the objective lens in the optical
pickup block. Therefore, when checking the laser diode emission,
observe from more than 30 cm away from the objective lens.
Laser component in this product is capable of emitting radiation
exceeding the limit for Class 1.
This appliance is classified as
a CLASS 1 LASER product.
This marking is located on the
rear exterior.
MODEL IDENTIFICATION
– Model Number Label –
• Abbreviation
E2 : 120V AC area in E model
E3 : 240V AC area in E model
E51 : Chilean and Peruvian models
MX : Mexican model
Model Part No.
E2, E51 model 4-152-900-0[]
E3 model 4-152-901-0[]
MX model 4-152-903-0[]
Parts No.

HCD-ZUX999
4
TABLE OF CONTENTS
1. SERVICING NOTES ............................................. 5
2. DISASSEMBLY
2-1. Loading Panel ................................................................ 10
2-2. Back Panel ...................................................................... 10
2-3. Top Panel Section ........................................................... 11
2-4. Side Panel (L) Assy, Side Panel (R) Assy....................... 11
2-5. Front Panel Section......................................................... 12
2-6. MAIN Board ................................................................... 12
2-7. CD Mechanism Deck...................................................... 13
2-8. REGULATOR Board...................................................... 13
2-9. PT Board, SUB PT Board ............................................... 14
2-10. AMP Board, DC FAN (FAN903).................................... 14
2-11. SPEAKER TERMINAL Board ...................................... 15
2-12. X-ROUND JOG Board................................................... 15
2-13. RIGHT ENTER Board, LEFT ENTER Board................ 16
2-14. SH-TAS Board ................................................................ 16
2-15. PANEL FUNCTION Board ............................................ 17
2-16. LF-TUBE Board, CROSS FADER Board...................... 17
2-17. Brackets .......................................................................... 18
2-18. MASTER VOLUME Board ........................................... 18
2-19. LEFT PANEL Board, USB-A Board .............................. 19
2-20. RIGHT PANEL Board, USB-B Board............................ 19
2-21. BOTTOM SIRCS Board, OPEN/CLOSE KEY Board,
DISC FUNCTION Board ............................................... 20
2-22. MICROPHONE Board, HEADPHONE Board .............. 20
2-23. Base Unit......................................................................... 21
2-24. BD Board ........................................................................ 21
2-25. DRIVER Board, SW Board ............................................ 22
2-26. SENSOR Board .............................................................. 22
2-27. MOTOR (TB) Board....................................................... 23
2-28. MOTOR (LD) Board ...................................................... 23
3. TEST MODE ............................................................ 24
4. ELECTRICAL CHECKS ...................................... 27
5. DIAGRAMS
5-1. Block Diagram –CD Servo Section–.............................. 30
5-2. Block Diagram –Audio Section–.................................... 31
5-3. Block Diagram –USB Section– ...................................... 32
5-4. Block Diagram –AMP Section– ..................................... 33
5-5. Block Diagram –Panel Section–..................................... 34
5-6. Block Diagram –Power Section–.................................... 35
5-7. Printed Wiring Boards –Driver Section– ........................ 37
5-8. Schematic Diagram –Driver Section– ............................ 38
5-9. Printed Wiring Board –BD Section– .............................. 39
5-10. Schematic Diagram –BD Section– ................................. 40
5-11. Printed Wiring Board –Main Section–............................ 41
5-12. Schematic Diagram –Main Section (1/4)–...................... 42
5-13. Schematic Diagram –Main Section (2/4)–...................... 43
5-14. Schematic Diagram –Main Section (3/4)–...................... 44
5-15. Schematic Diagram –Main Section (4/4)–...................... 45
5-16. Schematic Diagram –USB Section– ............................... 46
5-17. Printed Wiring Boards –SH-TAS, USB Section (1/2)– .. 47
5-18. Printed Wiring Board –SH-TAS Section (2/2)–.............. 48
5-19. Schematic Diagram –SH-TAS Section (1/5)– ................ 49
5-20. Schematic Diagram –SH-TAS Section (2/5)– ................ 50
5-21. Schematic Diagram –SH-TAS Section (3/5)– ................ 51
5-22. Schematic Diagram –SH-TAS Section (4/5)– ................ 52
5-23. Schematic Diagram –SH-TAS Section (5/5)– ................ 53
5-24. Printed Wiring Board –AMP Section–............................ 54
5-25. Schematic Diagram –AMP Section– .............................. 55
5-26. Printed Wiring Boards
–Headphone, Speaker Terminal Section–......................... 56
5-27. Schematic Diagram
–Headphone, Speaker Terminal Section– ........................ 57
5-28. Printed Wiring Board –Panel Function Section–............ 58
5-29. Schematic Diagram –Panel Function Section (1/2)–...... 59
5-30. Schematic Diagram –Panel Function Section (2/2)–...... 60
5-31. Printed Wiring Boards –Left/Right Enter,
Left/Right Panel, L-Shape Illumination-A/B Section–... 61
5-32. Schematic Diagram
–Left/Right Enter, Left/Right Panel Section–................. 62
5-33. Schematic Diagram
–L-Shape Illumination-A/B Section– ............................. 63
5-34. Printed Wiring Boards –Cross Fader, Master Volume,
X-Round Jog Section– .................................................... 64
5-35. Schematic Diagram –Cross Fader, Master Volume,
X-Round Jog Section– .................................................... 65
5-36. Printed Wiring Boards
–Bottom Sircs, FL-Tube, Microphone Section–............. 66
5-37. Schematic Diagram
–Bottom Sircs, FL-Tube, Microphone Section–............. 67
5-38. Printed Wiring Boards
–Disc Function, Open/Close Key, Regulator Section–... 68
5-39. Schematic Diagram
–Disc Function, Open/Close Key, Regulator Section–... 69
5-40. Printed Wiring Board –Power Section–.......................... 70
5-41. Schematic Diagram –Power Section–............................. 71
6. EXPLODED VIEWS
6-1. Overall Section ............................................................... 88
6-2. Front Panel Section......................................................... 89
6-3. Top Panel Section-1 ........................................................ 90
6-4. Top Panel Section-2 ........................................................ 91
6-5. Top Panel Section-3 ........................................................ 92
6-6. Chassis Section ............................................................... 93
6-7. CD Mechanism Deck Section-1 ..................................... 94
6-8. CD Mechanism Deck Section-2 ..................................... 95
7. ELECTRICAL PARTS LIST .............................. 96

HCD-ZUX999
5
SECTION 1
SERVICING NOTES
1. MANUALLY OPENING THE CD TRAY
2. SERVICE POSITION OF THE BASE UNIT
1
2
As illustrated, insert a flathead screwdriver
and give a turn to the left to put the tray out.
flathead screwdriver
CD tray
stand
base unit

HCD-ZUX999
6
3. SERVICE POSITION OF THE WHOLE PLAYER
two claws
bracket (F-panel)
Removing the bracket panel (F-panel)
Removing the top panel section
bracket (F-panel)
side bracket L
top panel section
holder (TP-support) (L) holder (TP-support) (R)
side bracket R

HCD-ZUX999
7
4. REMOVING THE JOG DIAL (ENTER)
1BTN-enter-A-assy
2Tap the dial with a flathead screwdriver or other tool
harder to remove it.
3jog dial (enter)
claw
claw
claw
claw
flathead screwdriver

HCD-ZUX999
8
SECTION 2
DISASSEMBLY
• This set can be disassembled in the order shown below.
2-2. BACK PANEL
(Page 10)
SET
Continued on the FLOW2
2-1. LOADING PANEL
(Page 10)
2-3. TOP PANEL SECTION
(Page 11)
2-23. BASE UNIT
(Page 21)
2-24. BD BOARD
(Page 21)
2-12. X-ROUND JOG BOARD
(Page 15)
2-14. SH-TAS BOARD
(Page 16)
2-15. PANEL FUNCTION BOARD
(Page 17)
2-18. MASTER VOLUME BOARD
(Page 18)
2-19. LEFT PANEL BOARD,
USB-A BOARD
(Page 19)
2-20. RIGHT PANEL BOARD,
USB-B BOARD
(Page 19)
2-13. RIGHT ENTER BOARD,
LEFT ENTER BOARD
(Page 16)
2-16. FL-TUBE BOARD,
CROSS FADER BOARD
(Page 17)
2-17. BRACKETS
(Page 18)

HCD-ZUX999
9
2-6. MAIN BOARD
(Page 12)
2-10. AMP BOARD,
DC FAN (FAN903)
(Page 14)
2-21. BOTTOM SIRCS BOARD,
OPEN/CLOSE KEY BOARD,
DISC FUNCTION BOARD
(Page 20)
2-22. MICROPHONE BOARD,
HEADPHONE BOARD
(Page 20)
2-11. SPEAKER TERMINAL BOARD
(Page 15)
2-4. SIDE PANEL (L) ASSY,
SIDE PANEL (R) ASSY
(Page 11)
2-9. PT BOARD,
SUB PT BOARD
(Page 14)
2-27. MOTOR (TB) BOARD
(Page 23)
2-28. MOTOR (LD) BOARD
(Page 23)
2-26. SENSOR BOARD
(Page 22)
2-5. FRONT PANEL SECTION
(Page 12)
2-25. DRIVER BOARD,
SW BOARD
(Page 22)
2-7. CD MECHANISM DECK
(Page 13)
2-8. REGULATOR BOARD
(Page 13)
To the FLOW1
• This set can be disassembled in the order shown below.

HCD-ZUX999
10
1
2
As illustrated, insert a flathead screwdriver
and give a turn to the left to put the tray out.
flathead screwdriver
3loading panel
1five screws
(case 3 TP2)
2five screws
(case 3 TP2)
3back panel
Note: Follow the disassembly procedure in the numerical order given.
2-1. LOADING PANEL
2-2. BACK PANEL

HCD-ZUX999
11
1screw
(+BVTP 3 u8)
4screw
(+BVTP 3 u8)
3screw
(+BVTP 3 u8)
7screw
(+BVTP 3 u8)
2wire
5wire
6two screws
(+BVTP 3 u8)
qs wire (flat type) (31 core)
(CN118)
qd wire (flat type) (31 core)
(CN101)
qh top panel section
qg wire (flat type) (21 core)
(CN105)
0four screws
(case 3 TP2)
8screw
(case 3 TP2)
9screw
(case 3 TP2)
qa
qf CN107 (10P)
1two screws
(+BVTP 3 u8)
3screw
(+BVTP 3 u8)
qa screw
(+BVTP 3 u8)
qs screw
(+BVTP 3 u8)
qd screw
(+BVTP 3 u8)
4screw
(+BVTP 3 u8)
5screw
(+BVTP 3 u8)
7two claws
qg two claws
2screw
(case 3 TP2)
0screw
(case 3 TP2)
8
qh
6holder (side-support)
qf holder (side-support)
9side panel (L) assy
qj side panel (R) assy
2-3. TOP PANEL SECTION
2-4. SIDE PANEL (L) ASSY, SIDE PANEL (R) ASSY

HCD-ZUX999
12
3screw
(+BVTP 3 u8)
4wire
5seven screws
(+BVTP 3 u8)
7front panel section
6
2CN115 (11P)
1CN120 (6P)
5two screws
(+BVTP 3 u8)
0
8wire (flat type) (9 core)
(CN104)
9wire (flat type) (9 core)
(CN113 )
qs wire (flat type) (19 core)
(CN106 )
qd MAIN board
qa wire (flat type) (13 core)
(CN109 )
1CN823 (7P)
2CN856 (4P)
3CN857 (15P) 4CN855 (5P)
6CN111 (12P) 7CN103 (11P)
2-5. FRONT PANEL SECTION
2-6. MAIN BOARD

HCD-ZUX999
13
1two screws
(+BVTP 3 u8)
2two screws
(+BVTP 3 u8)
3
4CD mechanism deck
1three screws
(+BVTP 3 u8)
2REGULATOR board
2-7. CD MECHANISM DECK
2-8. REGULATOR BOARD

HCD-ZUX999
14
4two screws
(+BVTP 3 u8)
9two screws
0two screws
qa PT board
5two screws
(+BVTP 3 u8)
8CN823 (7P)
7CN824 (5P)
6SUB PT board
1CN801 (3P)
2CN805 (6P)
3CN803 (3P)
8two screws
(+BVTP 3 u8)
qh two screws
(+BVTP 3 u8)
qf two screws
(+BVTP 3 u8)
qg heat sink
qa two screws
(+BVTP 3 u8)
9two screws
(+BVTP 3 u8)
0
7four screws
(+BVTP 3 u8)
qs four screws
(transister)
qd AMP board
1CN824 (5P)
2CN854 (9P)
6CN116 (3P)
qj DC fan (FAN903)
qk bracket (heatsink) (R)
3CN855 (5P)
4CN857 (15P)
5CN856 (4P)
2-9. PT BOARD, SUB PT BOARD
2-10. AMP BOARD, DC FAN (FAN903)

HCD-ZUX999
15
3three screws
(+BVTP 3 u8)
4two screws
(+BVTP 3 u8)
qs two screws
(+BVTP 3 u8)
9four screws
(+BVTP 3 u8)
8wire (flat type) (9 core)
(CN004)
qa wire (flat type) (9 core)
qd tuner (TU901)
6CN002 (3P)
7CN006 (3P)
0SPEAKER TERMINAL board
back panel assy
5
1CN854 (9P)
2CN103 (11P)
2CN1301 (6P)
two claws
1jog-dial-assy
3two screws
(+BVTP 2.6 (3CR))
5X-ROUND JOG board
4two screws
(+BVTP 2.6 (3CR))
2-11. SPEAKER TERMINAL BOARD
2-12. X-ROUND JOG BOARD

HCD-ZUX999
16
4CN1432 (5P)
7CN1437 (5P)
5RIGHT ENTER board
claw
claw
8LEFT ENTER board
2MAIN TO PANEL FFC board
1screw
(+BVTP 2.6 (3CR))
3screw
(+BVTP 2.6 (3CR)) 6three screws
(+BVTP 2.6 (3CR))
1CN603 (5P)
4CN604 (5P)
6wiring stopper
9wiring stopper
2CN602 (9P)
5screw
(+BVTP 2.6 (3CR))
8screw
(+BVTP 2.6 (3CR))
7screw
(+BVTP 2.6 (3CR))
0screw
(+BVTP 2.6 (3CR))
qa
3wire (flat type) (31 core)
(CN101)
qf wire (flat type) (21 core)
(CN600)
qg two screws
(+BVTP 3 u8)
qk four screws
(+BVTP 3 u8)
qh two screws
(+BVTP 3 u8)
qs two rivets
qd SH BOARD FFC board
qj shield plate (SH-A)
ql shield plate (SH-B)
w; SH-TAS board
2-13. RIGHT ENTER BOARD, LEFT ENTER BOARD
2-14. SH-TAS BOARD

HCD-ZUX999
17
claw
claw
claw
claw
flathead screwdriver
1BTN-enter-B-assy
2BTN-enter-B-assy
3two jog dial (enter)
claw
claw
claw
claw
8wire (flat type) (13 core)
(CN1008)
qa wire (flat type) (13 core)
(CN1003)
qs wire (flat type) (13 core)
(CN1012)
qd wire (flat type) (17 core)
(CN1001)
9CN1011 (4P)
qf PANEL FUNCTION board
0
7CN1010 (4P)
4nine screws
(+BVTP 2.6 (3CR))
5nine screws
(+BVTP 2.6 (3CR))
6CN1551 (3P)
CROSS FADER board
Tap the dial with a flathead screwdriver
or other tool harder to remove it.
3two screws
(+B 3 u6)
4CROSS FADER board
8SIDE COVER R board
qa SIDE COVER L board
9L-SHAPE ILLUMINATION-B board
qs L-SHAPE ILLUMINATION-A board
6FL-TUBE board
1four screws
(+BVTP 2.6 (3CR))
7screw
(+BVTP 2.6 (3CR))
0screw
(+BVTP 2.6 (3CR))
5four screws
(+BVTP 2.6 (3CR))
2
2-15. PANEL FUNCTION BOARD
2-16. FL-TUBE BOARD, CROSS FADER BOARD

HCD-ZUX999
18
1screw
(+BVTP 3 u8)
2screw
(+BVTP 3 u8)
4bracket top (F)
6bracket top (R)
8bracket top (L)
3four screws
(+BVTP 2.6 (3CR))
5five screws
(+BVTP 2.6 (3CR))
7five screws
(+BVTP 2.6 (3CR))
1knob (VOL)
2wire (flat type) (13 core)
(CN1393)
4MASTER VOLUME board
3eleven screws
(+BVTP 2.6 (3CR))
2-17. BRACKETS
2-18. MASTER VOLUME BOARD

HCD-ZUX999
19
5LEFT PANEL board
1three knobs (EQ)
3CN1307 (2P)
6CN604 (5P)
4ten screws
(+BVTP 2.6 (3CR))
7three screws
(+BVTP 2.6 (3CR))
8screw
(+BVTP 2.6 (3CR))
0screw
(+BVTP 2.6 (3CR))
9wire
qa USB-A board
qs ground (USB) (R) plate
2wire (flat type) (17 core)
(CN1304)
5RIGHT PANEL board
1two knobs (MIC)
3CN1364 (3P)
6CN603 (5P)
4ten screws
(+BVTP 2.6 (3CR))
7three screws
(+BVTP 2.6 (3CR))
8screw
(+BVTP 2.6 (3CR))
0screw
(+BVTP 2.6 (3CR))
9wire
qa USB-B board qs ground (USB) (R) plate
2wire (flat type) (13 core)
(CN1362)
2-19. LEFT PANEL BOARD, USB-A BOARD
2-20. RIGHT PANEL BOARD, USB-B BOARD

HCD-ZUX999
20
9button (eject)
qg button (disc)
4BOTTOM SIRCS board
8OPEN/CLOSE KEY board
qf DISC FUNCTION board
2plate (screw)
5CN1429 (3P)
6four screws
(+BVTP 2.6 (3CR))
qs four screws
(+BVTP 2.6 (3CR))
claw
claw
claw
claw
7four screws
(+BVTP 2.6 (3CR))
qd four screws
(+BVTP 2.6 (3CR))
3two screws
(+BVTP 2.6 (3CR))
1screw
(+BVTP 2.6 (3CR))
qa plate (screw)
0screw
(+BVTP 2.6 (3CR))
3MICROPHONE board
7HEADPHONE board
4bracket (MIC)
8bracket (HP)
1four screws
(+BVTP 2.6 (3CR))
5four screws
(+BVTP 2.6 (3CR))
2two screws
(+BVTP 3 u8)
6two screws
(+BVTP 3 u8)
2-21. BOTTOM SIRCS BOARD, OPEN/CLOSE KEY BOARD, DISC FUNCTION BOARD
2-22. MICROPHONE BOARD, HEADPHONE BOARD