Sony MHC-V44D Service Manual page 2

MHC-V44D
Ver. 1.1
License and Trademark Notice
• is a trademark of DVD Format/Logo Licensing Corporation.
• "DVD+RW", "DVD-RW", "DVD+R", "DVD-R", "DVD VIDEO", and
the "CD" logos are trademarks.
• 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.
• "WALKMAN" and "WALKMAN" logo are registered trade-
marks of Sony Corporation.
• This system incorporates Dolby* Digital.
* Manufactured under license from Dolby Laboratories. Dolby and
the double-D symbol are trademarks of Dolby Laboratories.
• 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" is a trademark of Sony Corporation.
• LDAC™ and LDAC logo are trademarks of Sony Corporation.
®
• The BLUETOOTH word mark and logos are registered trade-
marks 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.
• The N Mark is a trademark or registered trademark of NFC Fo-
rum, Inc. in the United States and in other countries.
• Android™ is a trademark of Google Inc.
• Google Play™ is a trademark of Google Inc.
• Apple, the Apple logo, iPhone, 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.
• THIS PRODUCT IS LICENSED UNDER THE MPEG-4 VISUAL
PATENT PORTFOLIO LICENSE FOR THE PERSONAL AND
NON-COMMERCIAL USE OF A CONSUMER FOR
(i) ENCODING VIDEO IN COMPLIANCE WITH THE MPEG-4
VISUAL STANDARD ("MPEG-4 VIDEO")
AND/OR
(ii) DECODING MPEG-4 VIDEO THAT WAS ENCODED BY
A CONSUMER ENGAGED IN A PERSONAL AND NON-
COMMERCIAL ACTIVITY AND/OR WAS OBTAINED FROM
A VIDEO PROVIDER LICENSED 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 COMMER-
CIAL USES AND LICENSING MAY BE OBTAINED FROM MPEG
LA, L.L.C.
HTTP://WWW.MPEGLA.COM
• All other trademarks are trademarks of their respective owners.
• In this manual, ™ and ® marks are not specified.
Abbreviation
•
AR : Argentina model
AUS : Australian model
E4 : African model
E12 : 220-240 V AC area in E model
E93 : 240 V AC area in E model
LA9 : Latin-American model
MY : Malaysia model
RU : Russian model
TH : Thai model
2
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.
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.
AC
1.5 kΩ voltmeter
(0.75 V)
Earth Ground
WITH SONY PARTS