Read Sony STR-DA6400ES (serv.man4) Service Manual online
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When the speaker impedance is set to 4 ohm in Menu, 4/8 RY signal is
output from SYSTEM CONTROLLER (IC2513 75pin) to LIMITTER
DETECT (Q1901). Then, PRE DRIVE B- will be shifted as same as
current limit operation in 3-5.
DETECT (Q1901). Then, PRE DRIVE B- will be shifted as same as
current limit operation in 3-5.
When TEMPERTURE SENSOR (IC1905, IC1903) detects over
temperature, LIMITTER (IC1902) turn on RY1402 with RELAY DRIVE
(Q1401) and LIMITTER DETECT (Q1910, Q1911) and the current to
AMP B+/- are limited to prevent overheat.
(Q1401) and LIMITTER DETECT (Q1910, Q1911) and the current to
AMP B+/- are limited to prevent overheat.
If the temperature is over than specified level, LIMMITER ((IC1902)
output PROTECTOR signal to SYSTEM CONTROLLER (IC2513
86pin) through LIMITTER DETECT (Q1912, Q1913) and SYSTEM
CONTROLLER starts “PROTECTOR” operation.
86pin) through LIMITTER DETECT (Q1912, Q1913) and SYSTEM
CONTROLLER starts “PROTECTOR” operation.
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