Sony MDR NC50, Руководство по обслуживанию

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9
MDR-NC50
SECTION 4
DIAGRAMS
•
Note for Printed Wiring Boards and Schematic Diagrams
Note on Schematic Diagram:
•
All capacitors are in
µ
F unless otherwise noted. (p: pF) 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.
•
A
: B+ Line.
•
H
: adjustment for repair.
•
Power voltage is dc 1.5 V and fed with regulated dc power supply
from battery terminal.
•
Voltages and waveform is dc with respect to ground under no-sig-
nal conditions.
•
Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal production toler-
ances.
•
Waveform is taken with a oscilloscope.
Voltage variations may be noted due to normal production toler-
ances.
•
Circled numbers refer to waveform.
•
Signal path.
F
: Audio signal (power off)
J
: Audio signal (power on)
N
: Monitor
Note on Printed Wiring Boards:
•
X
: parts extracted from the component side.
•
Y
: parts extracted from the conductor side.
•
: Pattern from the side which enables seeing.
(The other layer's pattens are not indicated.)
•
Waveform
1
ML Board IC52
5
(EXT),
MR Board IC152
5
(EXT)
1 V/DIV, 5
µ
s/DIV
10
µ
s
2.1 Vp-p
•
IC Block Diagrams
ML Board IC1
MR Board IC101
R1160N101B-TR-FA
ML Board IC6
MR Board IC106
LM4916LDX/NOPB
ML Board IC52
MR Board IC152
XC9103D091MR
CLICK-POP &
MODE CONTROL
LOGIC
BIAS
GENERATOR
–
+
OUT B 7
GND 6
VDD 10
SE/BTL 8
OUT A 9
IN A 1
–
+
IN B 5
SD 2
MUTE 3
BYPASS 4
1
2
VDD
GND
CE
REGULATOR
CURRENT
LIMIT
3
VOUT 5
ECO 4
EXT 5
GND 4
FB 1
VDD 2
CE 3
CURRENT
RIPPLE DETECT
& FB
+
–
ERROR AMP
+
–
PWM COMPARATOR
VREF WITH
SOFT START
& CE
RAMP WAVE
GENERATOR,
OSC
PWM/PFM
CONTROLLER
PHASE
COMPENSATION
BUFFER,
DRIVER
VCC