Diagrams - Sony mdr-nc50 Service Manual

• Note for Printed Wiring Boards and Schematic Diagrams
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. (p: pF) 50 WV or
less are not indicated except for electrolytics and tantalums.
• All resistors are in Ω and
1
/ W or less unless otherwise specified.
4
• 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 MΩ).
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
ML Board IC52 5 (EXT),
1
MR Board IC152 5 (EXT)
2.1 Vp-p
10 µ s
1 V/DIV, 5 µ s/DIV
SECTION 4

DIAGRAMS

• IC Block Diagrams
ML Board IC1
MR Board IC101
R1160N101B-TR-FA
VDD 1 REGULATOR
GND 2
CURRENT
CE 3
ML Board IC6
MR Board IC106
LM4916LDX/NOPB
IN A 1
CLICK-POP &
SD 2
MODE CONTROL
MUTE 3
LOGIC
BYPASS 4
GENERATOR
IN B 5
ML Board IC52
MR Board IC152
XC9103D091MR
FB 1 RIPPLE DETECT
VDD 2
VREF WITH
SOFT START
& CE
CE 3
5 VOUT
LIMIT
4 ECO
10 VDD
–
9 OUT A
+
8 SE/BTL
BIAS
–
7 OUT B
+
6 GND
CURRENT
PHASE
COMPENSATION
& FB
PWM COMPARATOR
+
+
BUFFER,
–
DRIVER
–
ERROR AMP
RAMP WAVE
GENERATOR,
PWM/PFM
OSC
CONTROLLER
MDR-NC50
VCC
5 EXT
4 GND
9