Sony SA-WCT770 Service Manual page 2

SA-WCT770
Ver. 1.1
Copyrights
This system incorporates Dolby* Digital and the DTS** Digital Surround
System.
* Manufactured under license from Dolby Laboratories.
Dolby, and the double-D symbol are trademarks of Dolby
Laboratories.
** Manufactured under license under U.S. Patent Nos: 5,956,674;
5,974,380; 6,226,616; 6,487,535; 7,212,872; 7,333,929; 7,392,195;
7,272,567 & other U.S. and worldwide patents issued & pending.
DTS-HD, the Symbol, & DTS-HD and the Symbol together are
registered trademarks of DTS, Inc.
Product includes software. © DTS, Inc. All Rights Reserved.
The BLUETOOTH® word mark and logos are registered trademarks owned
by Bluetooth SIG, Inc. and any use of such marks by Sony Corporation is
under license.
This system incorporates High-Definition Multimedia Interface (HDMI™)
technology.
The terms HDMI and HDMI High-Definition Multimedia Interface, and the
HDMI Logo are trademarks or registered trademarks of HDMI Licensing
LLC in the United States and other countries.
"BRAVIA" logo is a trademark of Sony Corporation.
"DSEE" is a trademark of Sony Corporation.
"x.v.Color" and "x.v.Color" logo are trademarks of Sony Corporation.
"PlayStation " is a registered trademark of Sony Computer Entertainment
®
Inc.
The N Mark is a trademark or registered trademark of NFC Forum, Inc. in
the United States and in other countries.
Android and Google Play are trademarks of Google Inc.
"ClearAudio+" is a trademark of Sony Corporation.
Apple, the Apple logo, iPhone, iPod, and iPod touch are trademarks of
Apple Inc., registered in the U.S. and other countries. App Store is a
service mark of Apple Inc.
"Made for iPod," and "Made for iPhone" mean that an electronic
accessory has been designed to connect specifically to iPod or iPhone,
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 or iPhone may affect
wireless performance.
Made for iPod/iPhone models
The compatible iPod/iPhone models are as follows. Update your iPod/
iPhone with the latest software before using with the system.
BLUETOOTH technology works with:
iPhone
iPhone 5s/iPhone 5c/iPhone 5/iPhone 4s/iPhone 4/iPhone 3GS
iPod touch
iPod touch (5th generation)/iPod touch (4th generation)
Other trademarks and trade names are those of their respective owners.
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
WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS
MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.
2
WITH SONY PARTS
NOTES ON CHIP COMPONENT REPLACEMENT
• 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.
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
WT-540A. Follow the manufacturers' instructions to use these
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)
To Exposed Metal
Parts on Set
0.15 μF
Fig. A. Using an AC voltmeter to check AC leakage.
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.
AC
1.5 kΩ voltmeter
(0.75 V)
Earth Ground