Section 4 Diagrams - Sony MDR-RF875RK Service Manual

Note on Printed Wiring Board:
• X : parts extracted from the component side.
• : Through hole.
®
• b : Pattern from the side which enables seeing.
Caution:
Pattern face side: Parts on the pattern face side seen from
(Side B) the pattern face are indicated.
Parts face side: Parts on the parts face side seen from
(Side A) the parts face are indicated.
Note on Schematic Diagram:
• 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 /
• : internal component.
¢
• A : B+ Line.
• H : adjustment for repair.
• Power voltage is dc 2.4 V and fed with regulated dc power supply
from battery terminal.
• Voltages are dc with respect to ground under no-signal conditions.
• Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal production toler-
ances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal production toler-
ances.
• Circled numbers refer to waveforms.
• Signal path.
F:
FM
L: AUDIO
• IC BLOCK DIAGRAMS
IC302 LA4533M
POWER
1
P/SW
SWITCH
2 AMP1
IN1
BIAS
PRE GND 3
AMP2
4
IN2
REF 5
W or less unless otherwise specified.
4
MUTE
10 MT/SW
CIRCIUT
9 OUT1
8
POWER GND
7
OUT2
6 VCC
SECTION 4
DIAGRAMS
IC305 TC7W74FU
— 10 —
8 7 6 5
S R Q
C D Q
1 2 3 4