Sony MDR-RF815R Service Manual page 7

4-1. BLOCK DIAGRAM
+V
L302
20
FRONT END
18 16 13
FM FE
FE UNIT
CF301
10.7MHz
26
CF302
10.7MHz
REG
22 21
+V
+V
L301
RECEIVE
FREQ.
RV303
TUNING
D301
16
SECTION 4
DIAGRAMS
IF AMP/DECODE
IC301
FM IF/ DECODE
DISCRI AMP
PD1
AUTO 1/2
BLEND COUNTER
PD1
MONO/ST
STEREO
MUTE
SW
VCO
27
RV301
FREE RUN
FREQ.
— 7 —
RV302
VOLUME
POWER AMP
6 2
5 R-CH
IND
B+
POWER D304
Note on Printed Wiring Board:
• X : parts extracted from the component side.
• : Through hole.
a
• b : Pattern from the side which enables seeing.
Caution:
Pattern face side:
(SideB)
SPEAKER
Parts face side:
9 L-CH
IC302
(Side A)
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
• : internal component.
f
• A : B+ Line.
SPEAKER
R-CH R-CH • 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.
S1
Voltage variations may be noted due to normal production toler-
ON/OFF SW
ances.
+
• Circled numbers refer to waveforms.
• Signal path.
Ni-Cd
1.2 x 2 F: FM
L: AUDIO
-
Signal path.
¥
• IC BLOCK DIAGRAM
F: FM
IC302 LA4533M
P/SW
IN1
PRE GND
IN2
REF
— 8 —
MDR-RF815R
Parts on the pattern face side seen from
the pattern face are indicated.
Parts on the parts face side seen from
the parts face are indicated.
1
/ W or less unless otherwise specified.
4
MUTE
POWER
1 10 MT/SW
CIRCIUT
SWITCH
2 AMP1 9 OUT1
BIAS
3 8 POWER GND
AMP2 7
4 OUT2
5
6 VCC