Diagrams; Block Diagrams - Sony MDR-RF915R Service Manual

MDR-RF915R/RF845R
Q Q

4-1. BLOCK DIAGRAMS

3 7 6 3 1 5 1 5 0
RX-BASE BOARD
+V
L302
ANT301
20
FRONT END
18 16
FM FE
FE UNIT
22
T E
L 1 3 9 4 2 2 9 6 5 1 3
+V
L301
RECEIVE
RF945R
FREQ.
D301
RV303
TUNE
RF915R
w w w
SECTION 4

DIAGRAMS

IF AMP/DECODE
IC301
FM IF/
13
DISCRI
CF301
26
CF302
10.7MHz
PD1
AUTO
BLEND
PD1
MUTE
REG
21
+V
FREE RUN
IC303
OSC SWITCH
COUNTER
Q301 Q303
x a o
. i
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6
DECODE
AMP 5 R-CH
10
DETUNE TUNING
12
MUTE IND
1/2
COUNTER
MONO/ST
STEREO
SW
IND
RF945R
VCO
27
Q Q
3 7
RV301
FREQ.
u 1 6 3
y
8 8
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2 4
8 9 9
w
POWER AMP
2 9
IC302
10
DETECT
IC304
IC305
MUTE
Q
D FF Q304
Q
Q305
S301
TUNE
ON/OFF SW
B+
6 3 1 5 1 5 0 8 9
D304
power
• Signal path.
: FM
: AUDIO
• R-ch is omitted due to same as L-ch.
m
c o
.
2
8 9 9
SPEAKER
L-CH
R-CH
SPEAKER
R-CH
S1
+
CHARGE
TERMINAL
(TO TMR-RF915R/RF945R)
–
2 4 9 8 2 9 9
RECHAGEABLE BATTERY
(NICKEL-CADMIUM)
NC-AA
2PCS, 2.4V