HCD-SX7, HCD-SX7B - Sony Audio Service Manual (repair manual). Page 2

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.

FLEXIBLE  CIRCUIT  BOARD  REPAIRING
• 

Keep the temperature of 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 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)

CAUTION
Use of controls or adjustments or performance of procedures 
other than those specifi ed herein may result in hazardous radia-
tion exposure.

Windows, the Windows logo, and Windows 
Media are either registered trademarks or 
trademarks 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.
Apple, the Apple logo, AirPlay, iPad, iPhone, 
iPod, iPod classic, iPod nano, iPod touch, iTunes, 
Mac and OS X are trademarks of Apple Inc., 
registered in the U.S. and other countries. iPad 
Air and iPad mini are trademarks of Apple Inc. 
App Store is a service mark of Apple Inc.
“Made for iPod,” “Made for iPhone,” and “Made 
for iPad” mean that an electronic accessory has 
been designed to connect specifically to iPod, 
iPhone or iPad, 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, 
iPhone or iPad may affect wireless performance.
Wi-Fi®, Wi-Fi Protected Access® and Wi-Fi 
Alliance® are registered marks of the Wi-Fi 
Alliance®.
Wi-Fi CERTIFIED™, WPA™, WPA2™ and Wi-Fi 
Protected Setup™ are marks of the Wi-Fi 
Alliance®.
“

” is a mark of the Wi-Fi Alliance.

DLNA™, the DLNA Logo and DLNA CERTIFIED™ 
are trademarks, service marks, or certification 
marks of the Digital Living Network Alliance.
“WALKMAN” and “WALKMAN” logo are 
registered trademarks of Sony Corporation.
MPEG Layer-3 audio coding technology and 
patents licensed from Fraunhofer IIS and 
Thomson.
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.
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.
Google Cast™ and the Google Cast Badge are 
trademarks of Google Inc.
“Xperia” and “Xperia Tablet” are trademarks of 
Sony Mobile Communications AB.
LDAC™ and LDAC logo are trademarks of Sony 
Corporation.
“DSEE” and 

 are trademarks of Sony 

Corporation.
“S-Master” is a trademark of Sony Corporation.
ClearAudio+ and 

 are 

trademarks of Sony Corporation.
AOSS is a trademark of BUFFALO INC.

This product incorporates Spotify software 
which is subject to 3rd party licenses found here:
https://developer.spotify.com/esdk-third-party-
licenses/
Spotify and Spotify logos are trademarks of the 
Spotify Group.
The system names and product names indicated 
in this manual are generally the trademarks or 
registered trademarks of the manufacturer.
™ and ® marks are omitted in this manual.

The use of optical instruments with this product 
will increase eye hazard.

This appliance is classified as a CLASS 1 LASER 
product. This marking is located on the rear 
exterior.