Sony MDR-RF845R Manual de servicio - Página 7

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Sony MDR-RF845R Manual de servicio
4-1. BLOCK DIAGRAM
+V
L302
20
FRONT END
18
16
13
FM FE
FE UNIT
CF301
26
CF302
10.7MHz
REG
22
21
+V
+V
L301
RECEIVE
FREQ.
IC303
D/A
OSC
CONV
Q301
D301
16
SECTION 4
DIAGRAMS
IF AMP/DECODE
IC301
FM IF/
DECODE
DISCRI
AMP
DETUNE
MUTE
PD1
AUTO
1/2
BLEND
COUNTER
PD1
MONO/ST
STEREO
MUTE
SW
VCO
27
RV301
FREE RUN
FREQ.
SWITCH
Q303
— 7 —
RV302
VOLUME
6
2
R-CH
5
IC304
10
DETECT
IC303
TUNING
Q
12
D
FF
IND
Q
Q305
S301
TUNING
IND
Note on Printed Wiring Board:
• X : parts extracted from the component side.
•
: Through hole.
®
SPEAKER
POWER AMP
• b : Pattern from the side which enables seeing.
9
L-CH
IC302
Caution:
10
Pattern face side:
(SideB)
Parts face side:
MUTE
(Side A)
Q304
Note on Schematic Diagram:
SPEAKER
R-CH
R-CH
• 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.
• A : B+ Line.
• H : adjustment for repair.
• Power voltage is dc 2.4 V and fed with regulated dc power supply
from battery terminal.
S1
• Voltages are dc with respect to ground under no-signal conditions.
ON/OFF SW
• Voltages are taken with a VOM (Input impedance 10 MΩ).
+
B+
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.
D304
POWER
• Circled numbers refer to waveforms.
• Signal path.
F:
FM
L: AUDIO
• Signal path.
: FM
• IC BLOCK DIAGRAMS
IC302 LA4533M
P/SW
IN1
PRE GND
IN2
REF
IC303 TC7W74FU
— 8 —
MDR-RF845R
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
8
7
6
5
S
R
Q
C
D
Q
1
2
3
4