Sony MHC-V02 Service Manual page 2

MHC-V02
License and Trademark Notice
• "CD" logo is trademark.
• WALKMAN and WALKMAN logo are registered trademarks
® ®
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 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.
• LDAC™ and LDAC logo are trademarks of Sony Corporation.
• The BLUETOOTH ® word mark and logos are registered trade-
marks owned by the 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.
• Android, Google Play, and the Google Play logo are trademarks
of Google LLC.
• Apple, the Apple logo, iPhone, iPod, and iPod touch are trade-
marks of Apple Inc., registered in the U.S. and other countries.
App Store is a service mark of Apple Inc., registered in the U.S.
and other countries.
• Use of the Made for Apple badge means that an accessory has
been designed to connect specifically to the Apple product(s)
identified in the badge, 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.
• All other trademarks are trademarks of their respective owners.
• In this manual, ™ and ® marks are not specified.
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.
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
damaged by heat.
FLEXIBLE CIRCUIT BOARD REPAIRING
• 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.
SAFETY CHECK-OUT
After correcting the original service problem, perform the following
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 2V 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.
AC
1.5 kΩ voltmeter
(0.75 V)
Earth Ground
SYS SET