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Sony STR-DN1050 Service Manual Page 9

Multi channel av receiver.
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NOTE OF REPLACING THE Q550, Q551, Q600,
Q601, Q650, Q651, Q700, Q701, Q750, Q751, Q800,
Q801, Q850 AND Q851 ON THE MAIN BOARD
Replacement of Q550, Q551, Q600, Q601, Q650, Q651, Q700,
Q701, Q750, Q751, Q800, Q801, Q850 and Q851 on the MAIN
board used in this unit requires L type screw driver.
L type screw driver
(e.g Compact 90 degree right
angled ratchet screwdriver (dr-05))
NOTE OF REPLACING THE IC1905, IC1906, IC1907,
IC1908, IC1909 OR IC1910 ON THE DCDC BOARD
Replacement of IC1905, IC1906, IC1907, IC1908, IC1909 or
IC1910 on the DCDC Board used in this unit required to unsolder
the grounding wire on the DCDC Board.
Grounding wire
After replaced the IC1905, IC1906, IC1907, IC1908, IC1909 or
IC1910, have to solder back the grounding wire on the DCDC
Board properly before turn on the set (refer image provided
below).
(Caution: If insuffi cient solder occured for the grounding wire in
DCDC Board, it may caused the set intermittent turn on/off and
will spoil the Digital Board)
OK
Grounding wire area (Conductor View)
CAPACITOR ELECTRICAL DISCHARGE PROCESSING
When checking the board, for the electric shock prevention,
connect the resistors to both ends of respective capacitors (C936
and C937 on the MAIN board) to discharge the capacitors.
– MAIN Board (Conductor Side) –
STR-DN1050
NG (Insufficient solder)
800 /5 W
800 /5 W
C936
C937
9

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