PHA-1A, PHA-1AEU - Sony Audio Service Manual (repair manual)

2015H33-1

© 

2015.08

10 Hz – 100 kHz

8 

ȍ - 600 ȍ

Approx. 148 mW + 148 mW (8 

ȍ, 10% distortion)

Approx. 80 mW + 80 mW (32 

ȍ, 1% distortion)

Approx. 16.4 mW + 16.4 mW (300 

ȍ, 10% distortion)

Stereo mini jack*

2

 (  (headphones))

*

2

 Only a 3-pole stereo mini plug is supported. Other plugs, including 2-pole 

mini plug or 4-pole stereo mini plug, are not supported.

Computer/WALKMAN®/Xperia connecting port
iPhone/iPad/iPod connecting port

0 °C to 40 °C (32°F to 104°F)

5 °C to 35 °C (41°F to 95°F)

DC 3.7 V: built-in lithium-ion rechargeable battery

7 W

DC 5 V: when charging via USB

Approx. 6 hours*

3

*

3

 when using the unit at 1 mW + 1 mW output (24 

ȍ). Time may vary, 

depending on the immediate environment or conditions of use.

When connected to a computer: Approx. 3.5 hours*

4

When connected to an AC outlet using the recommended USB AC adaptor 
(sold separately): Approx. 2 hours*

3

*

4

 Time required for empty battery to recharge while the unit is off.

Approx. 62  mm × 18.5  mm × 109  mm  

Approx. 145 g (5.11 oz)

Maximum 192 kHz/24 bit

Digital cable for WALKMAN® (1)
Digital cable for Xperia (1)
Micro-USB cable (1)
Silicone belt (2)
Protection sheet (1)
Startup Guide (1)
Reference Guide (1)

Remove the included items other than the unit by opening the tray under the 
unit and removing them.

Compliant OS: 
Windows 8.1/Windows 8.1 Pro/Windows 8/Windows 8 Pro  
Windows 7 

Starter (SP1 or later)/Home Basic (SP1 or later)/Home Premium (SP1 or later)/
Professional (SP1 or later)/Ultimate (SP1 or later) 
Windows Vista 
Home Basic (SP2 or later)/Home Premium (SP2 or later)/Business (SP2 or 
later)/Ultimate (SP2 or later)

Mac OS X (v10.6.8 or later)
CPU: Intel Core 2 Processor 1.6 GHz or better
Memory: 1 GB or better
USB port (USB 2.0 High Speed)

One of the above OS need to be installed to the computer at the factory.
The unit is not guaranteed to operate with all computers.
The unit is not guaranteed to operate with home built computers, operating 
systems that are personally upgraded, or multiple operating systems.
The unit is not guaranteed to operate with functions such as standby, sleep, 
or hibernation, on any computer.

Design and specifications are subject to change without notice.

(2 

1

/

2

 × 

3

/

4

 × 4 

3

/

8

 in) (w/h/d, projecting parts are not included)

*

1

 When the GAIN select switch is set to “LOW”, the maximum output will be 

approx. 150 mV + 150 mV. (PHA-1AEU only)

CAUTION
Danger of explosion if battery is incorrectly replaced.
Replace only with the same or equivalent type.

Photo: PHA-1A

You can use the unit with only the following models. Update 
your iPhone, iPad or iPod to the latest software before use.

iPhone 6 Plus
iPhone 6
iPhone 5s
iPhone 5c
iPhone 5
iPhone 4s
iPhone 4
iPhone 3GS
iPhone 3G
iPhone

iP

ad Air 2

iP

ad mini 3

iP

ad Air

iP

ad mini 2

iP

ad mini

iP

ad (4th generation)

iP

ad (3rd generation)

iP

ad 2

iP

ad

iP

od touch (1st through 5th 

generation)

iP

od classic 120GB/160GB  

(2009)

iP

od nano (2nd through 7th 

generation)

(As of December 2014)

This unit is compatible only with the audio playback functions 
iPhones/iPads/iPods.
Depending on the Apple product, there may be significant 
electric power required when starting the communication 
connected with the unit. The battery power of the unit may be 
drained and the unit may turn off if you connect the Apple 
product to the unit when the battery power is low. In this case, 
charge the unit or use the USB AC adaptor to connect with the 
Apple product.

WALKMAN® and WALKMAN® logo are registered trademarks of Sony 
Corporation.
“Xperia” and “Xperia Tablet” are trademarks of Sony Mobile 
Communications AB.
iPad, iPhone, iPod, iPod classic, iPod nano, iPod touch, and Retina are 
trademarks of Apple Inc., registered in the U.S. and other countries. iPad Air, 
and iPad mini are trademarks of Apple Inc.
“Made for iPod,” “Made for iPhone,” and “Made for iPad” mean that an 
electronic  accessory has been designed to connect specifically to iPod, 
iPhone or iPad, respectively, and has been certified by the developer to 
meet Apple performance standards. Apple is not responsible for the 
operation of this device or its compliance with safety and regulatory 
standards. Please note that the use of this accessory with iPod, iPhone, or 
iPad may affect wireless performance.
Macintosh and Mac OS are trademarks of Apple Inc., registered in the U.S. 
and other countries.
Microsoft, Windows and Windows Vista are registered trademarks or 
trademarks of Microsoft Corporation in the United States and/or other 
countries.
All other trademarks and registered trademarks are trademarks or 
registered trademarks of their respective holders. In this manual, TM and ® 
marks are not specified.

0  OR  DOTTED  LINE  

0  ON  THE  SCHEMATIC  DIAGRAMS  AND  IN  

0  SUR  

 .............................................  

3

2-1. Disassembly 

Flow 

...........................................................   4

2-2. Bottom 

Panel 

...................................................................   4

2-3.  Case Block, MAIN Board Block ....................................   5
2-4. Battery 

Assy 

(BAT1) 

.......................................................   5

2-5. MAIN 

Board 

...................................................................   6

2-6. Plate 

Middle 

Assy 

...........................................................   7

2-7.  HP JACK Board ..............................................................   7

3-1. Block 

Diagram 

................................................................   9

3-2.  Printed Wiring Boards (PHA-1A) ...................................   11
3-3. Schematic 

Diagram 

- MAIN Section (1/4) (PHA-1A) - .................................   12

3-4. Schematic 

Diagram 

- MAIN Section (2/4) (PHA-1A) - .................................   13

3-5. Schematic 

Diagram 

- MAIN Section (3/4) (PHA-1A) - .................................   14

3-6. Schematic 

Diagram 

- MAIN Section (4/4) (PHA-1A) - .................................   15

4-1.  MAIN Board Section ......................................................   23
4-2. Battery 

Section 

................................................................  24

 ..............................   25

Accessories are given in the last of the electrical parts list.

Note: Refer to service manual supplement-1 for printed wiring board, 

schematic diagram and electrical parts list of PHA-1AEU.

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)

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 fl ow) 
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.

DESTINATION  ABBREVIATIONS
The following abbreviations for model destinations are used in this 
service manual.

• Abbreviations
 AUS : 

Australian 

model

  CH 

: Chinese model

  CND  : Canadian model
  LA 

: Latin American model

  RU 

: Russian model

NOTE  FOR  PARTS  REPAIR  OF  HP JACK AND VOLUME  
BOARDS
When HP JACK and VOLUME boards installed in this unit are 
defective, replace the complete mounted board or the whole parts 
including the complete mounted board. The mounted parts on the 
HP HACK and VOLUME boards cannot replace with single.

NOTE  FOR  REPLACING  THE  MAIN  BOARD  OR  CASE
When replacing the MAIN board or case, be sure to replace both 
parts simultaneously. Among the repair parts, the MAIN board and 
case are supplied as one unit.

NOTE  FOR  REPLACING  THE  ELECTRICAL  PARTS  
ON  THE  MAIN  BOARD
The following parts on the MAIN board cannot replace with sin-
gle. When these parts are damaged, replace the complete mounted 
board. (Q003, Q004: PHA-1AEU only)

IC001, IC002, IC003, IC101, IC201, IC301, IC401, IC403, IC500, 
IC501, IC502, IC503, IC505, IC506, IC507, IC601, IC602, IC701, 
IC702, Q001, Q002, Q003, Q004

NOTE  OF  REPLACING  THE  IC704  ON  THE  MAIN  
BOARD
Replacement of IC704 on the MAIN board used in this unit re-
quires a special tool.

• 

This set can be disassembled in the order shown below.

Note: Follow the disassembly procedure in the numerical order given.

1 two screws

u 4)

2 bottom panel