NWZ-A844, NWZ-A845, NWZ-A846, NWZ-A847 - Sony Audio Service Manual (repair manual). Page 2

ATRAC is trademark of Sony Corporation.

t
t  “WALKMAN” and “WALKMAN” logo are registered trademarks of Sony 

Corporation.

t  

 is trademark of Sony Corporation.

t  Microsoft, Windows, Windows Vista and Windows Media are trademarks or 

registered trademarks of Microsoft Corporation in the United States and/or other 
countries.

t  Adobe, Adobe Reader and Adobe Flash Player are trademarks or registered 

trademarks of Adobe Systems Incorporated in the United States and/or other 
countries.

t  MPEG Layer-3 audio coding technology and patents licensed from Fraunhofer 

IIS and Thomson.

t  IBM and PC/AT are registered trademarks of International Business Machines 

Corporation.

t  Apple, Macintosh and iTunes are trademarks of Apple Inc., registered in the U.S. 

and other countries.

t  Pentium is a trademark or a registered trademark of Intel Corporation.
t  This software is based in part on the work of the Independent JPEG Group.
t  THIS PRODUCT IS LICENSED UNDER THE MPEG-4 VISUAL PATENT 

PORTFOLIO LICENSE FOR THE PERSONAL AND NON-COMMERCIAL 
USE OF A CONSUMER FOR
(i)  ENCODING VIDEO IN COMPLIANCE WITH THE MPEG-4 VISUAL 

STANDARD (“MPEG-4 VIDEO”) AND/OR

(ii) DECODING MPEG-4 VIDEO THAT WAS ENCODED BY A CONSUMER 

ENGAGED IN A PERSONAL AND NON-COMMERCIAL ACTIVITY 
AND/OR WAS OBTAINED FROM A VIDEO PROVIDER LICENSED BY 
MPEG LA TO PROVIDE MPEG-4 VIDEO.

NO LICENSE IS GRANTED OR SHALL BE IMPLIED FOR ANY OTHER USE. 
ADDITIONAL INFORMATION INCLUDING THAT RELATING TO 
PROMOTIONAL, INTERNAL AND COMMERCIAL USES AND LICENSING 
MAY BE OBTAINED FROM MPEG LA, LLC. SEE  HTTP://WWW.MPEGLA.

t  THIS PRODUCT IS LICENSED UNDER THE AVC PATENT PORTFOLIO 

LICENSE FOR THE PERSONAL AND NON-COMMERCIAL USE OF A 
CONSUMER TO
(i)  ENCODE VIDEO IN COMPLIANCE WITH THE AVC STANDARD 

(“AVC VIDEO”) AND/OR

(ii) DECODE AVC VIDEO THAT WAS ENCODED BY A CONSUMER 

ENGAGED IN A PERSONAL AND

NON-COMMERCIAL ACTIVITY AND/OR WAS OBTAINED FROM A 
VIDEO PROVIDER LICENSED TO PROVIDE AVC VIDEO. NO LICENSE IS 
GRANTED OR SHALL BE IMPLIED FOR ANY OTHER USE. 
ADDITIONAL INFORMATION MAY BE OBTAINED FROM MPEG LA, L.L.C. 
SEE HTTP://MPEGLA.COM 

t  THIS PRODUCT IS LICENSED UNDER THE VC-1 PATENT PORTFOLIO 

LICENSE FOR THE PERSONAL AND NON-COMMERCIAL USE OF A 
CONSUMER TO 
(i)  ENCODE VIDEO IN COMPLIANCE WITH THE VC-1 STANDARD 

(“VC-1 VIDEO”) AND/OR

(ii) DECODE VC-1 VIDEO THAT WAS ENCODED BY A CONSUMER 

ENGAGED IN A PERSONAL AND NON-COMMERCIAL ACTIVITY 
AND/OR WAS OBTAINED FROM A VIDEO PROVIDER LICENSED 
TO PROVIDE VC-1 VIDEO. 

NO LICENSE IS GRANTED OR SHALL BE IMPLIED FOR ANY OTHER USE. 
ADDITIONAL INFORMATION MAY BE OBTAINED FROM MPEG LA, L.L.C. 
SEE HTTP://WWW.MPEGLA.COM

t  All other trademarks and registered trademarks are trademarks or registered 

trademarks of their respective holders. In this manual, 

TM

 and ® marks are not 

specified.

This product is protected by certain intellectual property rights of Microsoft Corporation. 
Use or distribution of such technology outside of this product is prohibited without a license 
from Microsoft or an authorized Microsoft subsidiary.

Content providers are using the digital rights management technology for Windows Media 
contained in this device (“WM-DRM”) to protect the integrity of their content (“Secure 
Content”) so that their intellectual property, including copyright, in such content is not 
misappropriated.  
This device uses WM-DRM software to play Secure Content (“WM-DRM Software”). If the 
security of the WM-DRM Software in this device has been compromised, owners of Secure 
Content (“Secure Content Owners”) may request that Microsoft revoke the WM-DRM 
Software’s right to acquire new licenses to copy, display and/or play Secure Content. 
Revocation does not alter the WM-DRM Software’s ability to play unprotected content. A list 
of revoked WM-DRM Software is sent to your device whenever you download a license for 
Secure Content from the Internet or from a PC. Microsoft may, in conjunction with such 
license, also download revocation lists onto your device on behalf of Secure Content Owners.

Program ©2009 Sony Corporation
Documentation ©2009 Sony Corporation

Max. 20,000
Recordable number of photos may be less depending on file sizes.

NWZ-A844: 8 GB (Approx. 6.99 GB = 7,513,243,648 bytes)
NWZ-A845: 16 GB (Approx. 14.1 GB = 15,224,668,160 bytes)
NWZ-A846: 32 GB (Approx. 28.5 GB = 30,699,978,752 bytes)
NWZ-A847: 64 GB (Approx. 58.0 GB = 62,290,034,688 bytes)

*1

  Available storage capacity of the player may vary.

  A portion of the memory is used for data management functions.

“S-Master” digital amplifier

Frequency response 
20 to 20,000 Hz (when playing data file, single signal measurement)

Digital Noise Canceling function
Environment setting: Bus/Train / Airplane / Office
Noise Canceling Modes: Normal Mode / Quiet Mode / External Input Mode

Approx. 17 dB

*2

*1

  Under the Sony measurement standard.

*2

  Equivalent to approx. 98.0% reduction of energy of sound compared with not wearing 

headphones. ([Select NC Environment]: [Airplane])

FM Frequency range
87.5 to 108.0 MHz

128 kHz

Headphone cord antenna

Headphone: Stereo mini-jack
WM-PORT (multiple connecting terminal): 22 pins
Hi-Speed USB (USB 2.0 compliant)

5 °C to 35 °C (41 ºF to 95 ºF)

Built-in rechargeable lithium-ion battery
USB power (from a computer via the supplied USB cable)

USB-based charging
Approx. 3 hours (full charge), Approx. 1.5 hours (approx. 80 %)

Actual battery life may vary depending on settings. The estimated battery usage hours 
shown below are based on typical usage conditions with “Basic setting of battery life 
measurement (Longer battery life setting)” as shown in the table below. Note that even if 
the player is turned off for an extended period, a small amount of battery power is still 
consumed. Battery life may vary depending on volume setting, conditions of use, and 
ambient temperature.

Playback at MP3 128 kbps

Approx. 29 hours

Playback at WMA 128 kbps

Approx. 29 hours

Playback at AAC-LC 128 kbps

Approx. 29 hours

Playback at Linear PCM 1,411 kbps

Approx. 31 hours

Playback at MPEG-4 384 kbps

Approx. 9 hours

Playback at AVC Baseline 384 kbps

Approx. 8 hours

Playback at WMV 384 kbps

Approx. 8 hours

Approx. 14 hours

Noise Canceling

[Noise Canceling: On/Off]

*1

 

[On]

[Off]

Common settings

[Screen Off Timer] 

[After 30 Sec]

[After 30 Sec]

[Brightness]

*2

[3]

[3]

[Battery Care]

*3

[Off]

[Off]

Music settings

[Equalizer]

*4

[None]

*8

[None]

[VPT(Surround)]

*4

[None]

[None]

[DSEE(Sound Enhance)]

*4

[Off]

[Off]

[Clear Stereo]

*4

[Off]

[Off]

[Dynamic Normalizer]

*4

[Off]

[Off]

[DPC (Speed Control)]

*5

[Off]

[Off]

[TV Output(Music)]

*6

[Off]

[Off]

Video Settings

[TV Output(Video)]

*7

[Off]

[Off]

*1

  The [On] setting shortens the battery life about 25% compared with the [Off] setting.

*2

  The [5] setting shortens the battery life about 30% compared with the [3] setting.

*3

  The [On] setting shortens the battery life about 10% compared with the [Off] setting.

*4

  Setting [Equalizer] to other than [None], [VPT(Surround)] to other than [None], [DSEE(Sound 

Enhance)] to [On], [Clear Stereo] to [On] and [Dynamic Normalizer] to [On] shortens the battery life 
about 40 % compared with setting them to [None] or [Off].

*5

  The [x2.0] setting shortens the battery life about 65% compared with the [Off] setting.

*6

  The [On] setting with displaying the player’s screen on a television shortens the battery life about 40% 

compared with the [Off] setting.

*7

  The [On] setting with displaying the player’s screen on a television shortens the battery life about 50% 

compared with the [Off] setting.

*8

  The default setting for players sold in the Latin America region is [Custom 1]. The [Custom 1] setting 

shortens battery life of music playback by about 20% compared with the [None] setting.

2.8-inch, OLED (Organic Light Emitting Diode) color display,  
WQVGA (400 × 240 pixels), 262,144 colors

46.8 × 104.9 × 7.2 mm (1 7/8 × 4 1/4 × 5/16 inches)

47.4 × 104.9 × 7.7 mm (1 7/8 × 4 1/4 × 5/16 inches)

Approx. 62 g (2.2 oz)

 Headphones (1)
 Earbuds (Size S, L) (1)
 USB cable (1)
 Attachment (1)  

Use when connecting the player to the optional cradle, etc.
Audio input cable (1)
Plug adaptor for in-flight use (single/dual) (1)

 Quick Start Guide (1)

Software (1) 
The software is stored in the built-in flash memory of the player, and includes the 
following items. For details on how to install, refer to “Quick Start Guide.”

 Content Transfer

WALKMAN Guide

 Operation Guide, etc.

Design and specifications are subject to change without notice.

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