Read Sony XM-7557 Service Manual online
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
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