Diagrams; Block Diagram - Sony XM-255EX Service Manual

3-1. BLOCK DIAGRAM

CNJ101
(4/4)
OUTPUT
(THROUGH)
PRE AMP
L IC101(2/2)
VR101(3/4),VR101(4/4)
3
INPUT
1
2
(MONO)
CNJ101
(3/4)
CNJ301(4P)
L
HIGH
LEVEL
INPUT
R
PRE AMP
IC101(1/2)
VR101(1/4),VR101(2/4)
5
INPUT
7
6
CNJ101
R
(2/4)
SW501
OUTPUT
TEST TONE
(THROUGH)
CNJ101
OP AMP
(1/4)
1
IC401 (1/2)
CN101
B+
F901 (20A)
+12V
SWITCH
Q901,902
POWER
REMOTE
ON/OFF
Q903
LED
DRIVE
SWITCH
Q909,910
D905 D906
D905
OVER
CURRENT
09
SECTION 3

DIAGRAMS

VR101 VR102
LPF FILTER
FILTER SW501 LEVEL
IC201(2/2) IC301(2/2)
VR102(2/2)
LPF FILTER
3 1 3 1
OFF
VR101 VR102
LPF FILTER
FILTER SW501 LEVEL
IC201(1/2) IC301(1/2)
LPF FILTER VR102(1/2)
5 7 5 7
OFF
+B
OP AMP
3 6
7
2 5
IC401 (2/2)
LINE CONTROL
Q941,942
B+
PH901
DC DET PROTECT
LATCH
Q904,905
PROTECT
LATCH
Q906,907
D904
LED LED
DRIVE DRIVE
SWITCH SWITCH
Q911,913 Q914,915
Q908
16 1 14 10
D907
ON/OFF
3
CONTROL
D906 D907
OFFSET THERMAL
POWER/PROTECTOR
DIFFERENTIAL
SWITCH DRIVE AMP DRIVE AMP
AMP
Q401 Q404 Q408
Q403
BIAS
Q406,407
DIFFERENTIAL
DRIVE AMP DRIVE AMP
AMP
Q405 Q409
Q402
DIFFERENTIAL
SWITCH
DRIVE AMP DRIVE AMP
AMP
Q301
Q304 Q308
Q303
BIAS
Q306,307
DIFFERENTIAL
DRIVE AMP DRIVE AMP
AMP
Q305 Q309
Q302
(CURRENT CHECK)
OFFSET DET
Q953-954
T901
(CURRENT CHECK)
DC-DC CONVERTER
TRANSFORMER
ON/OFF
DRIVE
RECT
Q948
D908,909
DRIVER
Q946,949
ON/OFF
DRIVE
Q947
DC-DC CONVERTER
CONTROL
IC901
9
VCC
12
OSC
B+
7 7
CN201
SPEAKER
OUT
POWER AMP
Q410
L
OVER LOAD
POWER AMP
DET
Q411
Q412
L+R MONO
POWER AMP
Q310
R
OVER LOAD
POWER AMP
DET
Q311
Q312
+REG
B+
Q944
B+
B–
-REG
B–
Q933
• Signal path
F : AUDIO
XM-255EX/255NX
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 in-
dicated except for electrolytics and
tantalums.
• All resistors are in Ω and
1 / W or less un-
4
less otherwise specified.
• C : panel designation.
• U : B+ Line.
• Power voltage is dc 14.4V and fed with
regulated dc power supply from ACC and
BATT cords.
• Voltages and waveforms are dc with re-
spect to ground under no-signal condi-
tions.
no mark : POWER ON
* : Impossible to measure
• Voltage are taken with a VOM (Input im-
pedance 10 MΩ).
Voltage variations may be noted due to
normal production tolerances.
• Signal path.
F
: AUDIO
For printed wiring boards.
Note:
• X : parts extracted from the compo-
nent side.