Sony XM-7557 Service Manual page 36

XM-7557
• BLOCK DIAGRAM – POWER SECTION –
POWER BOARD
CNB805
OFFSET LED
OFFSET CONTROL
7
SET
TO Q809-810
Q804
AMPLIFIER
BOAD
8
CNP805
MUTE CONTROL MUTE SWITCH
MUTE ENABLER
9
D808,Q811 Q812
IC813
4 1
3 2
2
OVER CURRENT
5 CONTROL
Q807-808
MODE
OVER CURRENT
S801
HI-C
LED SWITCH
Q805
6 NFB
HI-V
S802
ON OFF
10
4
THERMAL DETECTOR
(For H,S)
D908
TH903
THERMAL
OR
CONTROL
THERMAL DETECTOR
Q918
(For TRANS)
TH904
D909
3
OR
CN802 F903 (25A)
+12V
SWITCH
SUB-WOOFER
Q901-902
BATTERY
F904 (25A)
GND
F901 (25A)
SWITCH CTL
4-CHANNEL
Q903
BATTERY F902 (25A)
+12V
D901
CNJ801
SWITCH
REMOTE
Q904
SWITCH
Q905
09
D806
OR
D911
MODE
S801 THERMAL SWITCH
HI-V
HI-C
TH905,Q919
IC903
12
REF-REG
DC DET
D910
2
3 14
1 4
1
2
15
16
D907
THERMAL THERMAL
3
SWITCH LED SWITCH
Q917 Q806
DC-DC
CONVERTER
IC904
THERMAL SWITCH
TH902,Q906
THERMAL
DET
TH901
12
REF-REG
D904
14
D903 1
2 3
2
1 4
IC901
15
DC DET
16
3
DC-DC
CONVERTER
IC902
MODE HI-C HI-V
S801
CNP804
D912
T902
DRIVER
11
INVERTER
Q921
Q924,926,928
10 SWITCHING
CONTROL
Q922-923
INVERTER
DRIVER
Q925,927,929
8
Q920
D913
9
D905
T901
DRIVER
11
INVERTER
Q908
Q911,913,915
10
SWITCHING
CONTROL
Q909-910
INVERTER
DRIVER Q912,914,916
8
Q907
D906
9
6 6
LED BOARD
D803
OVER CURRENT
4
5
D801 D802
6 HI-VOLTAGE HI-CURRENT
7
3
1
G G R G
B+
Q801 Q802
CNB804
SWITCH SWITCH
+28V
TO
AMPLIFIER
BOARD
-28V
B-
B+
+28V
TO
AMPLIFIER
BOARD
-28V
B-
D804 D805
THERMAL
OFFSET
R G R G
Q803
SWITCH
B+