Servicing Notes - Sony STR-DH550 Service Manual

STR-DH550/DH750
Ver. 1.1
MODEL IDENTIFICATION
–BACK PANEL–
Model
DH550: US, Canadian
DH550: AEP, UK
DH550: Australian
DH550: 220 – 240 V AC area in E model
DH750: US, Canadian
DH750: AEP, UK
DH750: Australian
DH750: Taiwan
DH750: Mexican
DH750: Brazillian
UNLEADED SOLDER
Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size)
: LEAD FREE MARK
Unleaded solder has the following characteristics.
• Unleaded solder melts at a temperature about 40 °C higher than
ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350 °C.
Caution: The printed pattern (copper foil) may peel away if the
heated tip is applied for too long, so be careful!
• Strong viscosity
Unleaded solder is more viscous (sticky, less prone to fl ow) than
ordinary solder so use caution not to let solder bridges occur
such as on IC pins, etc.
• Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.
SPECIAL COMPONENT NOTICE
The components identified by mark 9 contain confidential
information.
Strictly follow the instructions whenever the components are
repaired and/or replaced.
NOTICE POUR COMPOSANTS SPÉCIAUX
Les composants identifiés par la marque 9 contiennent des
informations confidentielles.
Suivre scrupuleusement les instructions chaque fois qu'un compo-
sant est remplacé et / ou réparé.
4
SECTION 1

SERVICING NOTES

NOTE OF REPLACING THE IC2402 AND IC2900 ON
THE MAIN BOARD
IC2402 and IC2900 on the MAIN board cannot exchange with
single. When these parts on the MAIN board are damaged,
exchange the entire mounted board.
NOTE OF REPLACING THE IC3514 ON THE HDMI
BOARD
IC3514 on the HDMI board cannot exchange with single. When
this part on the HDMI board is damaged, exchange the entire
Part No. mounted board.
Part No.
NOTE OF REPLACING THE IC902 (DH750) ON THE
STANDBY DCDC BOARD
4-487-917-0[]
IC902 (DH750) on the STANDBY DCDC board cannot exchange
4-487-917-1[]
with single. When this part on the STANDBY DCDC board is
4-487-917-2[]
damaged, exchange the entire mounted board.
4-487-917-3[]
4-448-923-0[]
CAPACITOR ELECTRICAL DISCHARGE PROCESSING
When checking the board, the electrical discharge is necessary for
4-448-923-1[]
the electric shock prevention.
4-448-923-2[]
Connect the resistor to both ends of respective capacitors.
4-448-923-3[]
4-448-923-4[]
• Main Board
4-448-923-6[] C930, C931
– MAIN BOARD (Conductor side) –
(To both ends of each capacitor)
800 /2 W
C930
C931