Srs-Rf90R - Sony SRS-RF90RK Service Manual

4-1. Block Diagrams

(SRS-RF90R)

+V
L102
(ANT)
20
FRONT END
16
18 FM FE
FE UNIT
(914MHz)
10.7MHz
L101
TRANSMISSION
FREQUENCY
22
+V
L101
FM
OSC
+2.2V
COUNTER
R
3 B6
4 B5
D101 5 B4
(DAC) 6
B3
9 B2
11
B1
12
B0
64R
• Signal path.
: FM
: AUDIO
• R-ch is omitted due to same as L-ch.
IC101
IF AMP/DECODE
FM IF/
13
DISCRI
CF102
10.7MHz
26
CF101
PD1
AUTO 1/2
BLEND COUNTER
PD1
MONO/ST
MUTE
REG VCO
21 27
+V
RV101
FREE RUN
IC102
FREQUENCY
Q102 Q101
CLK 1
OSC SWITCH
6
DECODE
AMP 5 R-CH
IC103
6 COMP.
10
7
+2.2V
5
DETUNE TUNING
12
MUTE IND
Q107
BUFFER
IC104
D-FF
STEREO
SW
IND
CK
1
Q103
2 D
CLR
S301
TUNE
POWER AMP B+
IC105
Q104
+5V
+2.4V +2.4V 1
REG
REG
Q204
IC201, Q901 RIPPLE
FILTER
D601
Q203
LED
POWER
DRIVER
S302
LIGHT
ON OFF
D701
(REFLECTOR)
13 13
IC201
AMP
2
3 1
7
IC202
POWER AMP
R-CH 10
2
1
3
R-CH
Q105
Q901
MUTING
HPF
R-CH
TWIN-T
FILTER
Q 3
Q 5
IC203
10
POWER AMP
6
Q202,
D201, 202
LIMITER
S201
POWER
OFF ON
3
D204
D602
CHARGE
RECHARGEABLE BATTERY
(NICKEL-CADMIUM)
D203
6PCS, 7.2V
SRS-RF90R/RF90RK/TMR-RF90
SP1
2
(SPEAKER)
R-CH
15
SP2
R-CH
(SPEAKER)
2
SP3
(WOOFER)
15
DC IN 9V