Sony SRS-NWGU50 Service Manual ▷ View online
SERVICE MANUAL
Sony Corporation
Audio&Video Business Group
Published by Sony Techno Create Corporation
SRS-NWGU50
SPECIFICATIONS
ACTIVE SPEAKER SYSTEM
9-889-581-02
2010A05-1
©
2010.01
US Model
Canadian Model
AEP Model
UK Model
Australian Model
Ver. 1.1 2010.01
• “WALKMAN” and
are registered trademarks of Sony Corporation.
• All other trademarks and registered trademarks are trademarks or registered trademarks
of their respective holders. In this manual, ™ and ® marks are not specifi ed.
Main unit
Continuous RMS power output (reference):
10 W + 10 W (1 kHz, 10 % THD)
Inputs
“WALKMAN” attachments
For compatible “WALKMAN” models.
LINE IN Stereo mini-jack
Speaker units
Speaker units
57 mm dia.
Dimensions (w/h/d):
Approx. 320 × 157 × 202 mm
(12 ⅝ × 6 ¼ × 8 inch)
(12 ⅝ × 6 ¼ × 8 inch)
Mass
Approx. 2.0 kg (4 lb 7 oz)
Supplied accessories
AC power Adaptor (1)
AC power cord (1)
Attachments for “WALKMAN” (2)
Remote commander (1)
Operating Instructions (1)
AC power cord (1)
Attachments for “WALKMAN” (2)
Remote commander (1)
Operating Instructions (1)
Design and specifications are subject to change
without notice.
without notice.
SRS-NWGU50
2
1.
SERVICING NOTES
............................................. 3
2. DISASSEMBLY
2-1. Disassembly
Flow
........................................................... 4
2-2. Bottom Cover Block ....................................................... 4
2-3. MAIN
2-3. MAIN
Board
................................................................... 5
2-4. Speaker
Box
Assy
........................................................... 5
3.
TEST MODE
............................................................ 5
4. DIAGRAMS
4-1. Block
Diagram
................................................................ 6
4-2. Printed
Wiring
Board
- MAIN Board (Component Side) - ................................ 8
4-3. Printed
Wiring
Board
- MAIN Board (Conductor Side) - .................................. 9
4-4. Schematic Diagram - MAIN Board (1/2) - ..................... 10
4-5. Schematic Diagram - MAIN Board (2/2) - ..................... 11
4-6. Printed Wiring Boards - PANEL Section - ..................... 12
4-7. Schematic Diagram - PANEL Section - .......................... 13
4-5. Schematic Diagram - MAIN Board (2/2) - ..................... 11
4-6. Printed Wiring Boards - PANEL Section - ..................... 12
4-7. Schematic Diagram - PANEL Section - .......................... 13
5.
EXPLODED VIEW
.................................................. 17
6.
ELECTRICAL PARTS LIST
.............................. 18
Accessories are given in the last of the electrical parts list.
TABLE OF CONTENTS
NOTES ON CHIP COMPONENT REPLACEMENT
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
SAFETY CHECK-OUT
After correcting the original service problem, perform the follow-
ing safety check before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs,
screws, and all other exposed metal parts for AC leakage.
Check leakage as described below.
After correcting the original service problem, perform the follow-
ing safety check before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs,
screws, and all other exposed metal parts for AC leakage.
Check leakage as described below.
LEAKAGE TEST
The AC leakage from any exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microamperes.).
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
The AC leakage from any exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microamperes.).
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers’ instructions to use these
instruments.
instruments.
2. A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a
VOM or battery-operated AC voltmeter. The “limit” indication
is 0.75 V, so analog meters must have an accurate low-voltage
scale. The Simpson 250 and Sanwa SH-63Trd are examples
of a passive VOM that is suitable. Nearly all battery operated
digital multimeters that have a 2 V AC range are suitable. (See
Fig. A)
is 0.75 V, so analog meters must have an accurate low-voltage
scale. The Simpson 250 and Sanwa SH-63Trd are examples
of a passive VOM that is suitable. Nearly all battery operated
digital multimeters that have a 2 V AC range are suitable. (See
Fig. A)
1.5 k
Ω
0.15
μF
AC
voltmeter
(0.75 V)
voltmeter
(0.75 V)
To Exposed Metal
Parts on Set
Parts on Set
Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.
SAFETY-RELATED COMPONENT WARNING!
COMPONENTS IDENTIFIED BY MARK
0 OR DOTTED LINE
WITH MARK
0 ON THE SCHEMATIC DIAGRAMS AND IN
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS
REPLACE THESE COMPONENTS WITH SONY PARTS
WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS
MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.
MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE
0 SUR
LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES
PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE FONC-
TIONNEMENT. NE REMPLACER CES COMPOSANTS QUE
PAR DES PIÈCES SONY DONT LES NUMÉROS SONT DON-
NÉS DANS CE MANUEL OU DANS LES SUPPLÉMENTS
PUBLIÉS PAR SONY.
PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE FONC-
TIONNEMENT. NE REMPLACER CES COMPOSANTS QUE
PAR DES PIÈCES SONY DONT LES NUMÉROS SONT DON-
NÉS DANS CE MANUEL OU DANS LES SUPPLÉMENTS
PUBLIÉS PAR SONY.
On safety
t AC power cord must be changed only at the qualified
t AC power cord must be changed only at the qualified
service shop.
t Do not use any other AC power adaptor.
Polarity of the plug
SRS-NWGU50
3
NOTE THE MOUNTED PARTS REPLACING
In each boards of the set, there are parts that cannot exchange a
part.
Exchange mounted board when parts written “Not supplied” on
the list of electrical parts are defective.
In each boards of the set, there are parts that cannot exchange a
part.
Exchange mounted board when parts written “Not supplied” on
the list of electrical parts are defective.
SECTION 1
SERVICING NOTES
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
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
• 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.
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
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.
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.
also be added to ordinary solder.
SRS-NWGU50
4
SECTION 2
DISASSEMBLY
• This set can be disassembled in the order shown below.
2-1. DISASSEMBLY FLOW
Note: Follow the disassembly procedure in the numerical order given.
2-2. BOTTOM COVER BLOCK
Note:
This illustration sees the set from bottom side.
SET
2-2. BOTTOM COVER BLOCK
(Page
(Page
4)
2-3. MAIN
BOARD
(Page
5)
2-4. SPEAKER
BOX
ASSY
(Page
5)
1 two foots
2 two screws
(BVTP3
u
8)
2 four screws
(BVTP3
u
8)
4 bottom cover block
3