Leakage Test; Safety-Related Component Warning - Sony HBD-TZ140 Service Manual

HBD-TZ140
Trademarks
This system incorporates with Dolby* Digital
and Dolby Pro Logic adaptive matrix
surround decoders.
* Manufactured under license from Dolby
Laboratories.
Dolby, Pro Logic, and the double-D
symbol are trademarks of Dolby
Laboratories.
This system incorporates High-Definition
Multimedia Interface (HDMI™) technology.
HDMI, the HDMI Logo, and High-Definition
Multimedia Interface are trademarks or
registered trademarks of HDMI Licensing
LLC in the United States and other countries.
"PlayStation" and "PS3" are registered
trademarks of Sony Computer Entertainment
Inc.
"BRAVIA" is a trademark of Sony
Corporation.
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 contains technology
subject to certain intellectual property rights
of Microsoft. Use or distribution of this
technology outside of this product is
prohibited without the appropriate license(s)
from Microsoft.
ABOUT MPEG-4 VISUAL: THIS PRODUCT
IS LICENSED UNDER THE MPEG-4
VISUAL PATENT PORTFOLIO LICENSE
FOR THE PERSONAL AND
NONCOMMERCIAL USE OF A
CONSUMER FOR DECODING VIDEO IN
COMPLIANCE WITH THE MPEG-4
VISUAL STANDARD ("MPEG-4 VIDEO")
THAT WAS ENCODED BY A CONSUMER
ENGAGED IN A PERSONAL AND
NONCOMMERCIAL ACTIVITY AND/OR
WAS OBTAINED FROM A VIDEO
PROVIDER LICENSED BY MPEG LA TO
PROVIDE MPEG-4 VIDEO.
NO LICENSE IS GRANTED OR SHALL BE
IMPLIED FOR ANY OTHER USE.
ADDITIONAL INFORMATION
INCLUDING THAT RELATING TO
PROMOTIONAL, INTERNAL AND
COMMERCIAL USES AND LICENSING
MAY BE OBTAINED FROM MPEG LA,
LLC. SEE http://www.mpegla.com/
All other trademarks are trademarks of their
respective owners.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specifi ed herein may result in hazardous radia-
tion exposure.

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
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