Block Diagram - Sub 1/Sub 2 Section; Ic Block Diagrams; Circuit Boards Location - Sony XM-7557 Service Manual

XM-7557
5-3. BLOCK DIAGRAM – SUB 1/SUB 2 SECTION –
SUB 1 BOARD
CNJ711
CNJ709 CNP709
TO
1 1
SUB 1 1
BOARD
2 4 4
S708
8 8
(US/CND)
9 9
FILTER
VR707
7 7
5 5
TEST TONE AMP
TEST TONE
TEST TONE AMP
S710
6 6
F
INPUT
3 3
MODE
2 2
S707
F+R
SUB 2 BOARD
L
SUB WOOFER
INPUT
R
CNJ706
09

• CIRCUIT BOARDS LOCATION

Amplifier board
Power board
BOOST
LOW CUT
FREQ
BOOST
BOOST LEVEL
IC714(2/2)
IC714(1/2)
VR709 (US/CND)
5
7 3
6
1
2
BOOST LEVEL
MODE
VR710 BOOST LEVEL
S708
BUFFER SWITCH
IC715
Q502
IC716(1/2)
3
1
2
2
1
3
IC716(2/2)
5
7
6
DIRECT
S709
BUFFER AMP
LEVEL CONTROL
IC713(1/2)
LEVEL
ON OFF
IC713(2/2)
VR708
2
1 6
3
7
5
SWITCH
Q501
TR board
Sub 2 board
Sub 1 board
LED board
Filter board
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
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 MΩ).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Waveforms are taken with a oscilloscope.
CNB710
Voltage variations may be noted due to normal produc-
6
tion tolerances.
9
TO
• Circled numbers refer to waveforms.
7
AMPLIFIRE
8
• Signal path.
BOARD
CNJ710
F : AUDIO
2
For printed wiring boards.
Note:
• X : parts extracted from the component side.
5-4. IC BLOCK DIAGRAM
• POWER section
IC902, 904 µPC494G2
16 15 14 13 12 11 10
REG.
REF.
ERROR
ERROR
0.1V OSC
1 2 3 4 5 6
10 10
1 / W or less unless otherwise
4
9
7 8