NW-E305, NW-E307 - Sony Audio Service Manual (repair manual). Page 2

2

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

4

2-1.

Disassembly Flow ...........................................................

5

2-2.

Window, Case (Upper), USB Lid ....................................

6

2-3.

Case (Lower) ...................................................................

6

2-4.

MAIN Board ....................................................................

7

2-5.

HEADPHONE Board ......................................................

8

2-6.

SWITCH FLEXIBLE Board,
Organic EL Indicator Module .........................................

8

2-7.

Lithium Battery ...............................................................

9

2-8.

Release Plate ....................................................................

9

2-9.

Spring (Lock) And Lock Spring (Out) ............................ 10

2-10. USB Guide Assy .............................................................. 11
2-11. Spring (Arm A) And Spring (Arm B) .............................. 12
2-12. Chassis Assy .................................................................... 12
2-13. USB Board ...................................................................... 13

............................................................... 14

4-1.

Block Diagram ................................................................ 16

4-2.

Printed Wiring Board  – MAIN Board (Side A) – ........... 17

4-3.

Printed Wiring Board  – MAIN Board (Side B) – ........... 18

4-4.

Schematic Diagram  – MAIN Board (1/4) – ................... 19

4-5.

Schematic Diagram  – MAIN Board (2/4) – ................... 20

4-6.

Schematic Diagram  – MAIN Board (3/4), USB Board,
HEADPHONE Board – ................................................... 21

4-7.

Schematic Diagram  – MAIN Board (4/4) – ................... 22

4-8.

Printed Wiring Boards  – HEADPHONE Board,
USB Board – ................................................................... 23

5-1.

Overall Section-1 ............................................................. 31

5-2.

Overall Section-2 ............................................................. 32

5-3.

Chassis Section ................................................................ 33

.................................. 34

Microsoft, Windows and Windows Media are trademarks or
registered trademarks of Microsoft Corporation in the United States
and/or other countries.
US and foreign patents licensed from Dolby Laboratories.
All other trademarks and registered trademarks are trademarks or
registered trademarks of their respective holders.

• Charge the battery in an ambient temperature of between 5 to

35 

°C (67 to 95 °F)

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 viscou-s (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.

• Keep the temperature of the 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.

• Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be

damaged by heat.

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