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HT-CT290/CT291

Copyrights and Trademarks

• This system incorporates Dolby* Digital.

* Manufactured under license from Dolby Laboratories.

Dolby, Dolby Audio, and the double-D symbol are trademarks of

Dolby Laboratories.

• 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. Other trademarks and trade names are

those of their respective owners.

• This system incorporates High-Deﬁ nition Multimedia Interface

(HDMI™) technology. The terms HDMI and HDMI High-Deﬁ nition

Multimedia Interface, and the HDMI Logo are trademarks or

registered trademarks of HDMI Licensing, LLC in the United States

and other countries.

• "BRAVIA" is a trademark of Sony Corporation.

• "PlayStation" is a registered trademark of Sony Computer

Entertainment Inc.

• MPEG Layer-3 audio coding technology and patents licensed

from Fraunhofer IIS and Thomson.

• Windows Media is either a registered trademark or trademark

of Microsoft Corporation in the United States and/or other

countries.

• 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.

• "ClearAudio+" is a trademark of Sony Corporation.

• Other system and product names are generally trademarks or

registered trademarks of the manufacturers. ™ and ® marks are

not indicated in this document.

• Abbreviation

AUS

: Australian model

CND : Canadian model

: 240 V AC area in E model

E12

: 220-240 V AC area in E model

: Saudi Arabia model

LA9

: Latin-American model

: Russian Model

: Singapore model

: Thai model

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.

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.

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.

1.5 kΩ

voltmeter

(0.75 V)

Earth Ground

WITH

SONY

PARTS