Sony XM-7557 Primary, Руководство по обслуживанию

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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.)
For schematic diagrams.
Note:
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
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
* : 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.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
• Circled numbers refer to waveforms.
• 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
1
4
8
9
7
5
6
3
2
CNJ706
CNP709
1
1
4
8
9
7
5
6
3
2
CNJ709
CNJ711
CNB710
BOOST
IC714(2/2)
L
SUB WOOFER
INPUT
09
3
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
S707
6
9
7
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