Sony XM-7557 Service Manual ▷ View online
XM-7557
8
8
SECTION 5
DIAGRAMS
5-1. BLOCK DIAGRAM – AMPLIFIER SECTION –
5
7
6
7
2
2
3
3
5
7
6
7
6
7
5
6
7
DIFFERENTIAL
AMP
Q104-105
DIFFERENTIAL
AMP
Q106-107
POWER AMP
(VOLTAGE STAGE)
Q108
BIAS
VR101,Q110
LEVEL SHIFT
Q101
OVERLOAD
Q113-114
5
9
7
8
6
2
3
3
5
4
7
6
7
2
2
3
3
5
7
6
7
6
7
5
6
7
DIFFERENTIAL
AMP
Q304-305
DIFFERENTIAL
AMP
Q306-307
LEVEL SHIFT
Q301
OVERLOAD
Q313-314
DIFFERENTIAL
AMP
Q512-513
OFFSET
SET
Q707-713
OVERLOAD
Q521-Q524
Q521-Q524
CNJ710
CNJ701
8
2
2
4
9
3
1
1
10
6
7
5
CNP805
DIFFERENTIAL
AMP
Q504-505
POWER AMP
(VOLTAGE STAGE)
Q109
POWER AMP
(VOLTAGE STAGE)
Q308
BIAS
VR301,Q310
POWER AMP
(VOLTAGE STAGE)
Q309
DIFFERENTIAL
AMP
Q505-506
POWER AMP
(VOLTAGE STAGE)
Q507
BIAS
VR501,Q509
POWER AMP
(VOLTAGE STAGE)
Q508
POWER AMP
(VOLTAGE STAGE)
Q516
BIAS
VR502,Q518
POWER AMP
(VOLTAGE STAGE)
Q517
POWER AMP
(FINAL STAGE)
Q111-112
POWER AMP
(FINAL STAGE)
Q311-312
POWER AMP
(FINAL STAGE)
Q510-511
POWER AMP
(FINAL STAGE)
Q519-512
NFB ON
NFB OFF
NFB ON
NFB OFF
NFB ON
NFB OFF
NFB ON
NFB OFF
RY701
RY702
DIRECT
SW706
DIRECT
SW703
LINE SWITCH
Q102
LINE SWITCH
Q103
LOWBOOST
IC701
LOWBOOST
IC706
LINE SWITCH
Q302
LINE SWITCH
Q303
DIFFERENTIAL
AMP
Q514-515
FAN CTL
Q702
CNP803
CNB803
CNP708
POWER
DRIVE
Q704
THERMAL
DET
TH701
POWER
CONTROL
Q703
FAN DRIVER
Q701
INVERTER
Q705
R-CH
R-CH
CN707
CN705
CN704
SPEAKER OUT
RY703(1/2)
RY703(2/2)
ON
OFF
OFF
B-
B-
B+
B+
PRE AMP
IC703
H.P.F
IC702
H.P.F
IC709
L.P.F
IC707
L.P.F
IC708
LEVEL
VR701
FILTER
VR702
FILTER
VR702
PRE AMP
IC704
H.P.F
IC702
H.P.F
IC710
L.P.F
IC712
L.P.F
IC711
LEVEL
VR704
FILTER
VR705
FILTER
VR705
X10,X1
S701
FILTER
CNP702
CNJ702
CNJ702
CNP702
CNJ703
CNP703
CNP703
CNJ703
HPF
LPF
FLAT
HPF
LPF
FLAT
LOWBOOST
VR703
LOWBOOST
VR708
CNJ708
FN801
DC FAN MOTOR
INVERTER
Q706
+42V
+14V
-14V
-42V
T701
D708
D709
D711
D710
B+
B+
B-
B-
R-CH
L-CH
TO
SUB 1
BOARD
CNB710
TO
POWER
BOARD
CNB805
09
FILTER BOARD
AMPLIFIER BOARD
FILTER
FILTER
S702
S705
L
MONO-L
R
MONO-L
INPUT
MONO-R
L
MONO-R
R
SUB WOOFER
SPEAKER OUT
FR
FL
RL
RR
M
X10,X1
S704
FILTER
ON
TR BOARD
• Signal path
: Audio
XM-7557
9
9
5-2. BLOCK DIAGRAM – POWER SECTION –
7
8
9
2
5
6
10
4
3
CNB805
CN802
CNJ801
TO
AMPLIFIER
BOAD
CNP805
SUB-WOOFER
BATTERY
GND
REMOTE
4-CHANNEL
BATTERY
4
5
6
7
3
1
3
1
CNP804
POWER BOARD
OFFSET CONTROL
Q809-810
OFFSET LED
SET
Q804
THERMAL DETECTOR
(For H,S)
TH903
THERMAL DETECTOR
(For TRANS)
TH904
NFB
S802
SWITCH
Q901-902
SWITCH
Q904
SWITCH CTL
Q903
THERMAL
CONTROL
CONTROL
Q918
THERMAL
SWITCH
Q917
THERMAL
LED SWITCH
Q806
11
10
1
1
4
1
2
3
2
2
15
16
3
3
8
9
12
14
REF-REG
THERMAL SWITCH
TH905,Q919
DRIVER
Q921
INVERTER
Q924,926,928
DRIVER
Q920
INVERTER
Q925,927,929
T902
SWITCHING
CONTROL
Q922-923
Q922-923
11
10
1
2
15
3
8
9
12
14
REF-REG
DRIVER
Q908
INVERTER
Q911,913,915
DRIVER
Q907
INVERTER
Q912,914,916
T901
SWITCHING
CONTROL
Q909-910
Q909-910
THERMAL SWITCH
TH902,Q906
SWITCH
Q905
D901
F903 (25A)
(25A)
(25A)
(25A)
F904
F901
F902
S801
HI-V
HI-C
+28V
-28V
TO
AMPLIFIER
BOARD
AMPLIFIER
BOARD
+28V
-28V
TO
AMPLIFIER
BOARD
AMPLIFIER
BOARD
D905
D912
D913
D906
IC903
DC DET
IC901
DC DET
DC-DC
CONVERTER
IC904
DC-DC
CONVERTER
IC902
THERMAL
DET
TH901
D904
D903
OVER CURRENT
CONTROL
Q807-808
Q807-808
OVER CURRENT
LED SWITCH
Q805
D908
D909
OR
D806
OR
OR
D907
16
MUTE CONTROL
D808,Q811
MUTE SWITCH
Q812
OFF
ON
S801
MODE
HI-C
HI-V
S801
D911
D910
HI-V
HI-C
MUTE ENABLER
IC813
D801
HI-VOLTAGE
D802
HI-CURRENT
D803
OVER CURRENT
G
G
G
R
D804
OFFSET
G
R
D805
THERMAL
G
R
B+
B+
B-
B+
B-
Q801
SWITCH
Q802
SWITCH
Q803
SWITCH
CNB804
LED BOARD
09
MODE
MODE
+12V
+12V
4
1
2
3
4
XM-7557
10
10
THIS NOTE IS COMMON FOR PRINTED WIRING
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed
in each block.)
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed
in each block.)
For schematic diagrams.
Note:
• All capacitors are in µF unless otherwise noted. pF: µµF
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
and tantalums.
• All resistors are in
Ω
and
1
/
4
W or less unless otherwise
specified.
•
C
: panel designation.
•
U
: B+ Line.
• Powr voltage is dc 14.4V and fed with regulated dc power
supply from +12V and REMOTE terminals.
• Voltages and waveforms are dc with respect to ground
under no-signal conditions.
no mark: POWER ON
no mark: POWER ON
*
: Impossible to mersure
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
• Signal path.
F
: AUDIO
For printed wiring boards.
Note:
• X
: parts extracted from the component side.
5-3. BLOCK DIAGRAM – SUB 1/SUB 2 SECTION –
4
1
2
3
5
6
7 8
9
10
16 15
14
13
12 11
ERROR
0.1V
REG.
REF.
OSC
ERROR
Power board
Amplifier board
Filter board
LED board
Sub 1 board
Sub 2 board
TR board
• CIRCUIT BOARDS LOCATION
5
6
6
1
4
8
9
7
5
6
3
2
3
2
CNJ706
CNP709
1
1
4
8
9
7
5
6
3
2
3
2
CNJ709
CNJ711
CNB710
BOOST
IC714(2/2)
L
SUB WOOFER
INPUT
09
3
2
2
1
BOOST LEVEL
IC714(1/2)
2
1
BUFFER
IC715
7
3
2
1
TEST TONE AMP
IC716(1/2)
TEST TONE AMP
IC716(2/2)
BOOST
LEVEL
MODE
S708
(US/CND)
(US/CND)
3
2
1
3
6
7
LEVEL CONTROL
IC713(2/2)
BUFFER AMP
IC713(1/2)
5
5
7
6
S709
LEVEL
VR708
SWITCH
Q501
SWITCH
Q502
ON
OFF
DIRECT
BOOST LEVEL
VR709
BOOST
LOW CUT
FREQ
TEST TONE
S710
F
F+R
INPUT
MODE
MODE
S707
6
9
9
7
8
8
2
TO
SUB 1
BOARD
S708
TO
AMPLIFIRE
BOARD
CNJ710
FILTER
VR707
SUB 1 BOARD
SUB 2 BOARD
VR710
R
2
5-4. IC BLOCK DIAGRAM
• POWER section
IC902, 904
µ
PC494G2
XM-7557
11
11
5-5. PRINTED WIRING BOARD – FILTER/SUB 1/SUB 2 SECTION –
• Semiconductor
Location
Ref. No.
Location
IC707
B-2
IC708
B-2
IC709
B-3
IC710
B-5
IC711
B-5
IC712
B-6
• Semiconductor
Location
Ref. No.
Location
D705
A-5
IC713
B-3
IC714
B-1
IC715
A-1
IC716
B-5
Q501
B-3
Q502
B-2
C506
C504
C505
C507
C513
C512
C519
C518
C501
JW84
JW50
JW48
JW57
JW58
JW60
JW59
JW66
BLU
BLU
BLU
BLU
BLU
BLU
BLU
BLU
BLU
BLK
JW63
JW64
JW65
JW62
JW56
JW55
JW47
JW54
JW53
JW52
JW51
JW44
(US/CND)
JW61
JW67
JW45
JW46
VR709
VR710
VR708
CNJ706
S708
CNP709
CNB710
1-675-265-
11
1
A
B
2
3
4
5
E
(Page 12)
S709
VR709
VR710
VR708
BOOST/
LOW CUT
FREQ
(7Hz 40Hz)
LEVEL
(MIN MAX)
S709
DIRECT
(ON OFF)
BOOST
LEVEL
(0dB 10dB)
S708(US/CND)
MODE
(BOOST LEVEL)
TO SUB 2 BOARD
CNJ709
SUB 1 BOARD
CNP710
09
R523
R524
R522
R519
R515
R512
R501
C502
R502
R707
R738
C743
R739
C744
R719
R718
R508
C715
R518
C520
R521
R520
R513
R514
C51
1
C714
C508
C509
R509
R505
R507
R51
1
R714
R709
R706
R71
1
R710
R705
C716
R708
C717
R504
R506
R510
C510
D705
IC714
IC715
IC713
IC716
Q502
E
Q501
E
R
L
INPUT
CNJ706
1
1
9
10
SUB 1 BOARD
R458
R258
R357
R457
C353
JW2
R352
R152
R157
R256
R257
R454
R452
R451
R453
R455
C451
R254
R253
R255
C251
R252
R251
C458
R460
R460
R353
R354
R456
R355
C351
R358
R356
R359
R153
R154
R155
C151
R159
R459
R260
C258
R259
C358
R351
R151
C158
R156
R160
R158
R360
IC712
IC711
IC710
IC708
IC709
IC707
JW17
1-675-267-
11
JW4
JW3
JW5
JW6
JW7
C452
C453
JW1
S704
JW19
CNJ703
1
9
C454
C455
JW18
JW20
JW11
JW10
JW109
JW16
C352
C356
C357
JW21
JW20
C456
C457
JW13
JW12
JW14
C355
C354
S705
VR705
JW8
JW24
JW37
C252
C153
JW38
JW29
JW30
JW23
JW26
JW28
JW27
JW31
JW39
JW40
JW41
JW42
JW25
JW43
JW36
JW35
JW34
JW33
JW32
C253
C156
C257
C256
C157
C154
C254
C255
C155
C152
CNJ702
1
9
VR702
S702
S701
FILTER BOARD
C
(Page 12)
S701
FILTER
(X1 X10)
VR702
FILTER
(50Hz — 400Hz)
S702
FILTER
(LPF OFF HPF)
S705
FILTER
(X1 X10)
VR705
FILTER
(50Hz — 400Hz)
S704
FILTER
(LPF OFF HPF)
AMPLIFIER BOARD
CNP702
1
A
B
C
2
3
4
5
6
7
B
(Page 12)
AMPLIFIER BOARD
CNP703
09
4
1
5
8
4
1
5
8
4
1
5
8
4
1
5
8
4
1
5
8
4
1
5
8
C515
CNJ711
CNJ709
S710
TEST
TONE
S707
VR707
1
9
1
A
B
2
4
3
SUB 2 BOARD
FILTER
(50Hz 200Hz)
INPUT MODE
(F F + R)
(US/CND)
OUT
Q
IN
GND
F
F+R
CONT
TO SUB 1 BOARD
CNP709
1-675-266-
11
R516
C514
R517
C516
09
TO SUB 1 BOARD
S708
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