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MZ-E909

SERVICE MANUAL

PORTABLE MINIDISC PLAYER

SPECIFICATIONS

US Model

AEP Model

E Model

Tourist Model

Model Name Using Similar Mechanism

NEW

MD Mechanism Type

MT-MZE909-173

Optical Pick-up Mechanism Type

LCX-4E

US and foreign patents licensed from Dolby
Laboratories Licensing Corporation

Ver 1.2  2002.02
with SUPPLEMENT-1

Audio playing system

MiniDisc digital audio system

Laser diode properties

Material: GaAlAs
Wavelength: 

λ

 = 790 nm

Emission duration: continuous
Laser output: less than 44.6 

µ

W*

* This output is the value measured at a distance
   of 200 mm from the objective lens surface on
   the optical pick-up block with 7 mm aperture.

Revolutions

Approx. 300 rpm to 2,700 rpm

Error correction

ACIRC (Advanced Cross Interleave Reed Solomon Code)

Sampling frequency

44.1 kHz

Coding

ATRAC (Adaptive TRansform Acoustic Coding)
ATRAC3: LP2
ATRAC3: LP4

Modulation system

EFM (Eight to Fourteen Modulation)

Number of channels

2 stereo channels
1 monaural channel

Frequency response

20 to 20,000 Hz 

±

 3 dB

Wow and Flutter

Below measurable limits

Outputs

Headphones/earphones: stereo mini-jack,
maximum output level
5 mW + 5 mW (US model) load impedance
16 ohms,
3 mW + 3 mW (Other models)
load impedance 32 ohms

Power requirements

Nickel metal hydride rechargeable battery
One NH-14WM(A) (supplied): 1.2V, 1,350 mAh
One LR6 (size AA) battery (not supplied)
External power jack (for the rechargeable
battery): Power rating 3V DC

Battery life 

1)

        (Unit: Approx. hours) (JEITA 

2)

 )

Batteries

SP Stereo

LP2

LP4

(normal)

 Stereo

Stereo

Ni-MH

     38

  45

  53

rechargeable
battery
NH-14WM(A)

3)

LR6 (SG)

      60

   70

  83

Sony Alkaline
dry battery 

4)

LR6 (SG)

4) 

and

      100

   122

 145

NH-14WM(A)

3)

1)

 Measured with the power save function on (see

   “Preserving battery power”) is on.

2)

 Measured in accordance with the JEITA (Japan

   Electronics and Information Technology
   Industries Association) standard (using a Sony
   MDW-series Mini-disc).

3)

 With a fully charged battery

4)

 When using a Sony LR6 (SG) “STAMINA” alkaline dry

   battery (produced in Japan).

Note

The battery operation may be shorter than that
specified, depending on the operating conditions,
the temperature of the location, and the type of
battery being used.

9-873-304-03

2002B0200-1

© 2002.02

Sony Corporation

Personal Audio Company

Published by Sony Engineering Corporation

Содержание Walkman MZ-E909

Страница 1: ...easurable limits Outputs Headphones earphones stereo mini jack maximum output level 5 mW 5 mW US model load impedance 16 ohms 3 mW 3 mW Other models load impedance 32 ohms Power requirements Nickel metal hydride rechargeable battery One NH 14WM A supplied 1 2V 1 350 mAh One LR6 size AA battery not supplied External power jack for the rechargeable battery Power rating 3V DC Battery life 1 Unit Appr...

Страница 2: ...hazardous radiation exposure Dimensions Approx 71 1 x 77 6 x 12 5 mm w h d 2 7 8 x 3 1 8 x 1 2 in not including projecting parts and controls Mass Approx 49 g 1 8 oz the player only Supplied accessories Headphones earphones with a remote control 1 Battery charging stand 1 AC power adaptor for the supplied battery charging stand Rechargeable battery 1 Rechargeable battery carrying case 1 Dry batter...

Страница 3: ... repairing this device with the power on if you remove the main board this device stops working In this case you work without the device stopping by fastening the hook of the Open Close detection switch S809 Open Ciose detection switch S809 ...

Страница 4: ... to resume play Press x and then slide OPEN 5 Playing an MD Insert an MD 1 2 3 Play an MD 2 x X 1N VOL VOL N VOLUME GROUP x 1 Turn the control towards N on the remote control or press N on the player to play the disc A short beep sounds in the headphones earphones when using the remote control The LED flashes and then lights up 2 Pull and turn VOL on the remote control or press VOLUME on the playe...

Страница 5: ...rocedure 2 1 Screws ES Lock 1 Screws ES lock Bracket L ASSY Lid ASSY upper 4 7 5 2 9 Motor flexible board CN551 6 Claw 8 OP flexible board CN501 1 Move claw away from bracket stop ASSY 3 Screw LL step Bracket stop ASSY Panel bottom Bracket R ASSY Mechanism deck Lid ASSY Upper Set Optical pick up ASSY Mechsnism deck Bracket R ASSY Main board sub ASSY Bracket L ASSY SW board Ver 1 1 2001 11 ...

Страница 6: ...s ES lock 3 Screw ES lock Panel bottom Bracket L ASSY Bracket R ASSY Ver 1 1 2001 11 6 4 7 1 Knob HOLD Main board sub ASSY Audio board Bracket L ASSY SW board Case K battery 5 Remove solder Two places 3 Lid battery case 2 Claw MAIN BOARD SUB ASSY Audio board is supplied with main board sub ASSY Audio board can t be moved away from main board Give a damage when take it off forcibly The part that au...

Страница 7: ...7 MZ E909 3 5 OPTICAL PICK UP ASSY 5 3 Screw MI 1 4 4 Spring thrust detent 1 Washer 2 Gear SA Optical pick up ASSY LCX 4E ...

Страница 8: ...ontrol 4 2 SETTING THE TEST MODE 4 2 1 How to set the TEST MODE To set the TEST MODE two methods are available 1 Solder bridge and short TAP601 TEST on the main board Then turn on the power MAIN BOARD SIDE A 2 In the normal mode operate the keys on the set and those on the remote control as specified below Turn on HOLD switch on the set Holding down x STOP key on the set press the keys on the remo...

Страница 9: ...hecks on the set s operation according to each individual function Usually no adjustments are made in this mode However the Manual mode is used to clear the memory before performing automatic adjustments in the OverallAdjustment mode 4 4 2 How to set the Manual mode 1 Set the TEST MODE and press key to set the Manual mode Remote control LCD display 4 During each test mode the display is changed fr...

Страница 10: ...ystem error 02 HIGH TEMP Temp HIGH TEMP 03 FOCUS ERROR Fcus Focus off center 04 SPINDLE ERROR Spdl Abnormal rotation of disc 11 TOC ERROR TOC TOC error 12 READ DATA ERROR Data Power system error 22 LOWBATT LBat Instantaneous interruption detected 31 OFFSET ERROR Ofst Offset error Offset error 32 FE_ABCD_OFFSET_ERR ABCD FE ABCD Offset error 33 TE_ABCD_OFFSET_ERR TE TE ABCD Offset error 34 X1_TE_OFF...

Страница 11: ...isplay 4 When all the key have been checked or when the top panel is opened during this checking the system terminates the Key Check mode and return to the TEST MODE 000 0F 4 7 SOUND SKIP CHECK RESULT DISPLAY MODE This set can display and check the error count occurring during play Setting method of Sound Skip Check Result Display Mode 1 Setting the test mode 2 Press the N key activates the sound ...

Страница 12: ...code 4 963 646 01 MO disc PTDM 1 part code J 2501 054 A or commercially available MO disc recorded Digital voltmeter 5 2 2 Adjustment sequence The adjustments should be always performed in the following sequence 5 2 3 Power The power is supplied with 1 5 V DC from the battery case 5 3 RESET NV 5 3 1 How to reset NV 1 Set the TEST MODE 2 Set the Manual mode and set the item No 021 Reset NV LCD disp...

Страница 13: ...verall Ad justment mode LCD display 2 Insert CD disc in the set and press key to set the Overall CD Adjustment mode Automatic adjustments are made LCD display XXX Item No for which an adjustment is being executed 5 4 4 Vd PWM Duty adjustment method 1 Set the Manual mode and set the item No to 765 LCD display 2 Connect a digital voltmeter to TP903 VD on the main board and adjust key Voltage down an...

Страница 14: ...et adjustment 312 Laser ON Focus UP VC correction ALFA offset adjustment 313 IJ offset adjustment 314 FE offset adjustment HPIT adjustment 320 Focus servo ON 324 TE offset adjustment 1 321 TE gain adjustment 328 TWPP gain adjustment 324 TE offset adjustment 1 332 TE offset adjustment 2 330 Tracking servo ON 336 ABCD gain adjustment 337 KF gain correction 338 RF gain adjustment 344 CD focus gain ad...

Страница 15: ...TON offset adjustment 121 TE gain adjustment 122 TON offset adjustment 123 TEIN offset adjustment 124 TWPP offset adjustment 130 Tracking servo ON 131 TWPP offset adjustment 136 ABCD gain adjustment 137 KF gain adjustment 139 ADIP BPF fo adjustment 144 FCS gain adjustment 145 TRK gain adjustment 134 TWPP gain adjustment 131 TWPP offset adjustment 1 132 TWPP offset adjustment 2 149 TWPP OP offset a...

Страница 16: ...h F Analog J Digital Replacement of IC601 used in this set requires a special tool The voltage and waveform of CSP chip size package cannot be measured because its lead layout is different form that of conventional IC Note on Printed Wiring Boards MAIN SECTION X parts extracted from the component side Pattern from the side which enables seeing The other layers patterns are not indicated Caution Pa...

Страница 17: ...44 21 31 43 24 23 4 8 9 10 11 12 14 5 6 13 7 18 19 LASER AUTO POWER CONTROL Q501 3 4 2 19 11 20 13 12 5 18 9 10 14 15 16 17 7 8 6 1 TRACKING COIL FOCUS COIL 20 Jx Jy Jx Ix Iy Iy Ix Jx Jy A B C D PD Ix a F b c d MINIDISC OPTICAL PICK UP BLOCK LCX 4E LD AVCC S0 S1 AVCC S0 LD K LD A MON D C B A Jy Jx Ix Iy D D C PD I PD O C B A VREF VREF A C Jy Jx Ix Iy S1 RF AMP FOCUS ERROR TRACKING ERROR TPP WPP AP...

Страница 18: ...5 10 14 15 20 25 28 43 29 30 35 40 45 50 5556 42 IC901 1 5 10 14 15 20 25 28 43 29 30 35 40 45 50 55 56 42 IC551 IC501 IC902 1 1 5 1 3 5 4 5 10 10 15 15 20 20 22 44 40 35 30 25 23 CN501 OPTICAL PICK UP BLOCK LCX 4E X601 IC601 TP921 TP604 TP605 TP565 TP560 TP602 TP601 TP533 TP603 SHORT TEST MODE OPEN NORMAL MODE TAP601 FB801 FB802 IC801 1 1 5 15 2 10 19 20 4 8 5 RB553 RB554 D855 3 2 1 4 5 CN801 A A...

Страница 19: ...TP610 TP607 TP558 TP606 TP552 TP556 TP561 TP564 TP608 TP557 TP551 TP104 TP204 TP810 TP811 TP812 TP813 TP302 TP203 TP103 TP570 TP572 TP573 TP571 TP526 TP952 TP525 TP532 TP524 TP530 TP523 TP527 TP528 TP529 TP521 TP501 TP502 TP591 TP516 TP919 TP907 TP902 TP920 TP912 TP911 TP904 TP519 TP517 TP513 TP514 TP515 TP510 TP511 TP512 TP507 TP508 TP509 TP577 TP576 TP557 TAP501 TP574 TP567 TP566 TP503 TP505 TP5...

Страница 20: ...Y A B MON AVCC SO SI VCC EEPROM XBUSY RST GND XCS SK DI DO DIGITAL SIGNAL PROCESSOR DIGITAL SERVO SIGNAL PROCESSOR EFM ACIRC ENCODER DECODER SHOCK PROOF MEMORY CONTROLLER ATRAC ENCODER DECODER CSP Chip Size Package D A CONVERTER 16M BIT D RAM SYSTEM CONTROL MCUVDD0 MIFVSS3 XRST S MON VB MON CHG MON SET KEY 1 SET KEY 2 HIDC MON WK DET REC KEY AVDD AVSS VDIOSC OSCI OSCO HALF LOCK SW RMC KEY VSIOSC D...

Страница 21: ...3k 0 1 3300p XC6368B101MR 0 1 0 0068 10 6 3V 0 47 0 1 2 12 15 4 5 6 7 8 9 11 13 14 16 17 18 CLV MON W CLV MON V CLV MON U CLV CON W CLV CON V CLV CON U CLV PWM XRST MTR DRV FFCLR SLEEP FS4 VLON RMC DTCK RMC KEY VC PWN VL PWN SLD MON W SLD MON V SLD MON U SLD CON U SLD PWM SLD CON V SLD CON W TR1 TF1 FF1 FR1 FCS FCS TRK TRK VD PWM FOCUS TRACKING COIL DRIVE SPINDLE SLED MOTOR DRIVE VLON XWK1 VSTB GN...

Страница 22: ...5 C103 C203 TAP801 OPEN CLOSE TP826 TP825 TP305 TP304 1 5 15 2 10 19 20 CN802 A MAIN BOARD LAST DIGIT 11 CN801 A MAIN BOARD LAST DIGIT 21 CN801 1 6 7 12 13 18 19 IC301 24 1 5 9 CN803 1 9 CN804 11 1 682 470 SWITCH FLEXIBLE BOARD SW BOARD SIDE B SW BOARD SIDE A S808 HOLDc OFFtON S809 OPEN CLOSE R815 R813 R814 R811 R812 11 11 1 682 469 11 11 1 682 469 S804 VOLUME S805 VOLUME S806 GROUP S801 x S803 S8...

Страница 23: ...0k 0 01 OPEN CLOSE 20P OPEN CLOSE 6 8k 10k 15k 33k 33 10 6 3V 1 0 1 2SC4738FL 470p 9P 100 4V 100 4V 9P 68k TLQU1008 SET KEY XWK1 OPEN CLOSE HOLD SW GND XHP STB MUTE BEEP VIF UNREG R IN L OUT AGND AGND L IN R OUT STB MUTE BST SW BEEP GND VREF IN B OUT L PWR GND OUT R DET AGC IN BTS NF2 LPF2 NF1 LPF1 VREF OTUA BEEP IN L IN R VCC ICMT BEEP OTUB HOLD ON OFF REFERENCE VOLTAGE SWITCHING LED R LED G VC L...

Страница 24: ... VMF1 19 18 17 16 15 FI1 RI1 COM1 CPUI1 CPVI1 22 21 20 CPWI1 GND2 NC BIAS VC ROE VC 3Phase control ch1 3Phase control ch2 3Phase Pre driver ch1 H BRIDGE PRE DRIVER CH1 H BRIDGE CONTROL CH1 VC VC VG VC VG VC VC OE VG VG VCVG VCVG GND VG VC VG VC VG VC VG VC VC VC U V W U V W H BRIDGE CONTROL CH2 VC VG 3Phase Pre driver ch2 H BRIDGE PRE DRIVER CH2 26 27 28 CPVO1 53 54 IC501 SN761057DBT 1 TE REXT Wpp...

Страница 25: ...GND2 L2 NC NC VD VC2 XRST CRST RSTREF VREF VB GND CLKSEL VAIFON FFCLR SLEEP CLK SERIAL PASS REGULATOR VA SERIAL PASS REGULATOR VD SERIAL PASS REGULATOR VIF BANDGAP REFERENCE VC XRST INT VC VC VSTB VC VB POWER SWITCH 1 VG STEP UP PRE DRIVEER VG STEP UP PRE DRIVEER PWM VG VC VG VG VC STEP UP DC DC CONVERTOR START UP VC VB VB VG VG STEP UP PRE DRIVEER PWER SWITCH 2 VG VC VB VC VSTB CONTROL VC IC902 X...

Страница 26: ...1 SHEET INSULATING 4 3 234 168 01 KNOB OPEN 5 3 234 163 01 PANEL BOTTOM SILVER JEW 5 3 234 163 11 PANEL BOTTOM BLUE JEW 5 3 234 163 21 PANEL BOTTOME SILVER US AEP FR E HK 5 3 234 163 31 PANEL BOTTOME BLUE E HK 6 3 222 249 01 KNOB HOLD 8 3 234 166 01 WINDOW LED 9 3 234 165 01 BUTTON CONTROL 10 3 234 167 01 ESCUTCHEON 11 3 227 923 21 CASE K BATTERY 12 1 682 470 11 SWITCH FLEXIBLE BOARD 13 A 3062 694...

Страница 27: ...1 SCREW M1 4 TAPPING 53 3 222 394 01 CHASSIS 54 3 224 779 02 SPRING THRUST DETENT 55 4 222 216 01 GEAR SA 56 3 338 645 31 WASHER 0 8 2 5 57 3 225 996 01 SCREW M1 4 EG PRECISION PAN 58 3 225 996 07 SCREW M1 4 EG PRECISION PAN 59 4 222 208 01 GEAR SB 60 3 043 237 02 BEARING N 61 4 222 203 02 SCREW LEAD 062 X 3379 869 1 OPTICAL PICK UP LCX 4E 63 3 222 391 01 SPRING M RACK 64 3 225 278 11 SCREW TAPPIN...

Страница 28: ... 11 RES CHIP 10 5 1 16W R106 1 218 963 11 RES CHIP 6 8K 5 1 16W R201 1 218 971 11 RES CHIP 33K 5 1 16W R202 1 218 971 11 RES CHIP 33K 5 1 16W R203 1 218 961 11 RES CHIP 4 7K 5 1 16W R204 1 208 929 11 RES CHIP 10 5 1 16W R206 1 218 963 11 RES CHIP 6 8K 5 1 16W R301 1 218 935 11 RES CHIP 33 5 1 16W R302 1 218 963 11 RES CHIP 6 8K 5 1 16W R303 1 218 981 11 RES CHIP 220K 5 1 16W X 3381 935 1 MAIN BOAR...

Страница 29: ...ITE 0uH IC IC501 8 759 689 67 IC SN761057DBT IC551 6 700 680 01 IC SC111258FCR2 IC601 8 753 000 06 IC CXD2671B 206GA IC801 8 759 680 85 IC AK6417AL L IC901 6 700 880 01 IC XPC18A32AFCR2 IC902 8 759 657 26 IC XC6368B101MR JACK J301 1 793 288 62 JACK i INDUCTOR L503 1 469 570 21 INDUCTOR 10uH L901 1 419 258 21 INDUCTOR 68uH L902 1 419 646 21 INDUCTOR 47uH L903 1 424 929 21 INDUCTOR 150uH L904 1 414 ...

Страница 30: ...R RB553 1 233 967 11 RES NETWORK CHIP TYPE 10K RB554 1 233 964 21 RES NETWORK CHIP TYPE 3 3K VIBLATOR X601 1 795 002 21 VIBRATOR CERAMIC 45 1584 MHz A 3062 694 A SW BOARD COMPLETE CONNECTOR CN804 1 793 327 21 CONNECTOR FPC ZIF 9P DIODE D801 6 500 050 01 LED KPTB 1612LSURKMGKC 3 COLOR INFO LED D802 8 719 083 54 LED TLOU1008A T05 3 COLOR INFO LED RESISTOR R811 1 218 963 11 RES CHIP 6 8K 5 1 16W R812...

Страница 31: ...K 505 3 220 749 01 CASE CARRYING 506 8 953 811 91 RECEIVER EAR MDR E803SP EXCEPT US 506 8 954 019 90 HEADPHONE MDR A034SP US 507 X 3381 087 1 ATTACHMENT ASSY ST 508 1 476 763 15 CHARGE UNIT AEP E HK JEW 0 1 569 007 11 ADAPTOR CONVERSION 2P JEW 3 008 521 01 CASE BATTERY CHARGE US AEP FR 3 008 521 21 CASE BATTERY CHARGE E HK JEW 3 021 018 11 LABEL FRANCE FR 3 234 034 01 MANUAL INSTRUCTION JAPANESE J...

Страница 32: ...32 MZ E909 ...

Страница 33: ...MZ E909 SERVICE MANUAL SUPPLEMENT 1 File this Supplement with the Service Manual Subject z CHANGE OF MAIN BOARD ECN DAB01299 US Model AEP Model E Model Tourist Model 2002 02 ...

Страница 34: ...IN BOARD SIDE A MAIN 1 125 777 11 CERAMIC CHIP 0 1uF 10 10V 1 125 777 11 CERAMIC CHIP 0 1uF 10 10V 8 753 000 15 IC CXD2671B 209GA 8 759 572 21 IC S 80808ANNP E7Y T2 8 729 046 45 TRANSISTOR SI2302DS T1 6 550 075 01 TRANSISTOR UMZ8NTR 8 729 037 92 TRANSISTOR 2SD2216J R TX SO 8 729 037 92 TRANSISTOR 2SD2216J R TX SO 1 218 979 11 RES CHIP 150K 5 1 16W 1 218 977 11 RES CHIP 100K 5 1 16W 1 218 989 11 RE...

Страница 35: ...13 7 18 19 LASER AUTO POWER CONTROL Q501 3 4 2 19 11 20 13 12 5 18 9 10 14 15 16 17 7 8 6 1 TRACKING COIL FOCUS COIL 20 Jx Jy Jx Ix Iy Iy Ix Jx Jy A B C D PD Ix a F b c d MINIDISC OPTICAL PICK UP BLOCK LCX 4E LD AVCC S0 S1 AVCC S0 LD K LD A MON D C B A Jy Jx Ix Iy D D C PD I PD O C B A VREF VREF A C Jy Jx Ix Iy S1 RF AMP FOCUS ERROR TRACKING ERROR TPP WPP APC SERIAL I F AVCC 22 40 DVDD AVCC VIF RF...

Страница 36: ...Q501 BCE D901 D902 C903 C901 L503 L904 L905 L901 L902 L903 MAIN BOARD SIDE A C606 C610 C524 C922 C904 C919 C923 C925 C907 1 5 10 14 15 20 25 28 43 29 30 35 40 45 50 5556 42 IC901 1 5 10 14 15 20 25 28 43 29 30 35 40 45 50 55 56 42 IC551 IC501 IC902 1 1 5 1 3 5 4 5 10 10 15 15 20 20 22 44 40 35 30 25 23 CN501 OPTICAL PICK UP BLOCK LCX 4E X601 IC601 TP921 TP604 TP605 TP565 TP560 TP602 TP601 TP533 TP...

Страница 37: ...10 TP607 TP558 TP606 TP552 TP556 TP561 TP564 TP608 TP557 TP551 TP104 TP204 TP810 TP811 TP812 TP813 TP302 TP203 TP103 TP570 TP572 TP573 TP571 TP526 TP952 TP525 TP532 TP524 TP530 TP523 TP527 TP528 TP529 TP521 TP501 TP502 TP591 TP516 TP919 TP907 TP902 TP920 TP912 TP911 TP904 TP519 TP517 TP513 TP514 TP515 TP510 TP511 TP512 TP507 TP508 TP509 TP577 TP576 TP557 TAP501 TP574 TP567 TP566 TP503 TP505 TP504 ...

Страница 38: ... A LD K JX JY A B MON AVCC SO SI VCC EEPROM XBUSY RST GND XCS SK DI DO DIGITAL SIGNAL PROCESSOR DIGITAL SERVO SIGNAL PROCESSOR EFM ACIRC ENCODER DECODER SHOCK PROOF MEMORY CONTROLLER ATRAC ENCODER DECODER CSP Chip Size Package D A CONVERTER 16M BIT D RAM SYSTEM CONTROL MCUVDD0 MIFVSS3 XRST S MON VB MON CHG MON SET KEY 1 SET KEY 2 HIDC MON WK DET REC KEY AVDD AVSS VDIOSC OSCI OSCO HALF LOCK SW RMC ...

Страница 39: ...SD2216 1M 0 1 0 1 100k 1M 47k 1M 100k 2SD2216 SI2302DS T1 DC DC CONVERTER ON OFF XP4601 1 2 12 15 4 5 6 7 8 9 11 13 14 16 17 18 CLV MON W CLV MON V CLV MON U CLV CON W CLV CON V CLV CON U CLV PWM XRST MTR DRV FFCLR SLEEP FS4 VLON RMC DTCK RMC KEY VC PWN VL PWN SLD MON W SLD MON V SLD MON U SLD CON U SLD PWM SLD CON V SLD CON W TR1 TF1 FF1 FR1 FCS FCS TRK TRK VD PWM FOCUS TRACKING COIL DRIVE SPINDL...

Страница 40: ...at the upper right on the revised page allows you to jump to the next revised page Ver Date Description of Revision 1 0 2001 09 New 1 1 2001 11 Model addition AEP French E ENG 01026 Change the main board to service ASSY including AUDIO BOARD 1 2 2002 02 US model added DA B01299 SUPPLEMENT 1 Change the main board ...

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