Read Sony STR-DE485 / STR-DE485E Service Manual online
STR-DE485/DE485E
19
19
4-6. BLOCK DIAGRAM — POWER SECTION —
8
12
11
DRIVE
POWER AMP
Q701-704
CURRENT
DETECT
Q705,706
RY791
RY701
RY601
PRE DRIVER
IC701
IN 2
+VOUT2
-VOUT2
SPEAKERS
IMPEDANCE
USE 8-16
Ω
R
L
FRONT
L
SURROUND
CENTER
R
R-CH
R-CH
R-CH
FL-CH
FR-CH
SL-CH
C-CH
R-CH
SR-CH
R-CH
TUNER/
AUDIO
SECTION
4
RY901
D804
F1
F2
-30V
+3.3V
(STBY)
+2.5V
+5V-1
-7V
+7V
TU+10V
TU+3.3V
-30V
F901
RECT
D910-913
T902
POWER
TRANSFORMER
D914
Q921
D915
JW905
D731
D734
D733
~
AC IN
OVERLOAD
DETECT
D740,Q740
1
67
6
5
DRIVE
POWER AMP
Q501-504
CURRENT
DETECT
Q505,506
-30V REG
Q801
RELAY
DRIVER
Q901
PRE DRIVER
IC501
IN+
+VOUT
-VOUT
OVERLOAD
DETECT
D540,Q540
DOUBLER
COMMUTATION
8
12
11
DRIVE
POWER AMP
Q651-654
CURRENT
DETECT
Q655,656
PRE DRIVER
IC702
IN 2
+VOUT2
-VOUT2
OVERLOAD
DETECT
D640,Q640
RELAY
DRIVER
Q790
RELAY
DRIVER
Q710
RELAY
DRIVER
Q610
RY501
RELAY
DRIVER
Q510
70
72
68
PROTECTOR
D721,722
Q722,723,725
25
66
48
71
OVERLOAD
DETECT AMP
7
2
IC601
Q692
Q691
+B
-B
-BB
+3.3V
REG
1
3
IC1905
BACK-UP
SWITCH
4
5
+3.3V
2
IC1901
+5V-2
+5V
REG
1
3
IC1503
+10V
REG
1
3
IC1902
-V
+V
+7V
REG
1
3
IC801
-7V
REG
2
3
IC802
+5V
REG
1
3
IC1903
+3.3V
REG
1
3
IC1904
R-CH
R-CH
R-CH
-BB +B
-BB +B
-BB +B
R-CH
R-CH
R-CH
RECT
D802
D802
RECT
D820-822
RECT
D902-905
T901
POWER
TRANSFORMER
D898,899
TM601
TM602
J791
PHONES
S901
VOLTAGE
SELECTOR
220V
240V
120V
HP-RY
FRONT-RY
REAR-RY
CENTER-RY
HP DETECT
HP-RY
HP DETECT
FRONT-RY
REAR-RY
CENTER-RY
HEADPHONE
RELAY
PREOUT/FRONT
RELAY
REAR RELAY
PROTECTOR
HP DETECT
POWER RELAY
STOP
CENTER RELAY
E M0DEL
AEP,UK M0DEL
EXCEPT
E
M0DEL
E
M0DEL
SYSTEM
CONTROL
IC1601 (4/4)
PRE
DRIVE
PRE
DRIVE
PRE
DRIVE
-1
-2
-3
• Signal path
: TUNER (FM/AM)
• R-ch is omitted due to
same as L-ch.
same as L-ch.
(Page 16)
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