HCD-ECL77BT, HCD-ECL99BT - Sony Audio Service Manual (repair manual). Page 2

0  OR  DOTTED  LINE  

0  ON  THE  SCHEMATIC  DIAGRAMS  AND  IN  

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

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)

0  SUR  

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.
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.
The N Mark is a trademark or 
registered trademark of NFC Forum, 
Inc. in the United States and in other 
countries.
Android™ is a trademark of Google 
Inc.
Google Play™ is a trademark of 
Google Inc.
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.
All other trademarks and registered 
trademarks are of their respective 
holders. In this manual, 

TM

 and 

®

marks are not specified.

CAUTION
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.