Sony SRS-RF80R / SRS-RF80RK / TMR-RF80 Service Manual ▷ View online
11
SRS-RF80R/RF80RK/TMR-RF80
Asjustment Location :
+
–
–
digital voltmeter
(AC range)
(AC range)
L+ / R+
L– / R–
+
–
–
+
–
–
L+
IC101 pin4
oscilloscope
L–
CH1
CH2
17. Check the difference of the L and R to more than 20 dB.
IC101
7
IC101
4
Q101 collector
(Connect a 33 K
Ω
resistor)
IC101
6
RV101:
Free Run Frequency
Adjustment
Free Run Frequency
Adjustment
GND
L101:
Receiving Frequency
Adjustment
Receiving Frequency
Adjustment
TP102
RX BOARD
(Conductor side)
(Conductor side)
12
SRS-RF80R/RF80RK/TMR-RF80
SECTION 4
DIAGRAMS
Note on Printed Wiring Boards:
•
X
: parts extracted from the component side.
•
b
: Pattern from the side which enables seeing.
Note on Schematic Diagram:
• All capacitors are in
µ
F unless otherwise noted. pF:
µµ
F
50 WV or less are not indicated except for electrolytics
and tantalums.
and tantalums.
• All resistors are in
Ω
and
1
/
4
W or less unless otherwise
specified.
•
C
: panel designation.
•
A
: B+ Line.
•
H
: adjustment for repair.
• Power voltage is dc 9V and fed with regulated dc power
supply from battery terminal.
• Voltages is dc with respect to ground under no-signal
(detuned) conditions.
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Signal path.
K
: FM
L
: AUDIO
• CIRCUIT BOARDS LOCATION (SRS-RF80R)
RX board
CHARGE board
AMP board
JACK board
SW board
REFLECTOR board
MEGABASS board
13
13
SRS-RF80R/RF80RK/TMR-RF80
4-1. Block Diagrams
(SRS-RF80R)
• Signal path.
• R-ch is omitted due to same as L-ch.
: FM
: AUDIO
L101
FM
OSC
D101
+V
+V
FRONT END
FE UNIT
18
13
16
FM IF/
DISCRI
DECODE
AMP
DETUNE
MUTE
TUNING
IND
STEREO
IND
CF102
10.7MHz
26
CF101
10.7MHz
6
5
R-CH
10
7
10
15
2
IC202
POWER AMP
15
2
IC203
POWER AMP
Q105
MUTING
Q901
HPF
Q202,
D201, 202
LIMITER
TWIN-T
FILTER
Q107
BUFFER
22
20
FM FE
L102
+V
Q102
OSC
Q101
SWITCH
10
12
27
Q103
Q
Q
AUTO
BLEND
MUTE
MONO/ST
SW
1/2
COUNTER
PD1
PD1
VCO
21
REG
RV101
FREE RUN
FREQUENCY
IC101
IF AMP/DECODE
(ANT)
R-CH
SP1
(SPEAKER)
SP2
(SPEAKER)
SP3
(WOOFER)
S301
TUNE
RV301
VOL 2
(914MHz)
3
4
5
6
1
9
11
12
B6
B5
B4
B3
B2
B1
B0
CLK
+2.2V
IC102
COUNTER
R
64R
(DAC)
+5V
REG
IC105
D602
D601
D701
D204
CHARGE
POWER
POWER
POWER AMP B+
J801
DC IN 9V
Q204
RIPPLE
FILTER
Q203
LED
DRIVER
1
3
OFF
ON
S201
LIGHT
OFF
ON
S302
D203
Q104
+2.4V
REG
(REFLECTOR)
IC201, Q901
+2.4V
RECHARGEABLE BATTERY
(NICKEL-CADMIUM)
6PCS, 7.2V
R-CH
R-CH
R-CH
R-CH
+2.2V
IC103
COMP.
6
5
1
2
3
5
CK
D
6
CLR
7
2
3
1
IC104
D-FF
IC201
AMP
3
1
TRANSMISSION
FREQUENCY
L101
14
14
SRS-RF80R/RF80RK/TMR-RF80
(TMR-RF80R)
• R-ch is omitted due to same as L-ch.
• Signal path.
• Signal path.
L
: AUDIO
F
: FM
J401
S401
NOISE FILTER
NOISE
FILTER
ALC
AMP
CH2
AMP
BUFFER
Q401
AMP
D404,405
RECT
DIVIDER
BUFFER
OSC
AMP
TIME
DIVISION
MPX
J402
OFF
L
R
R-CH
R-CH
R-CH
R-CH
14
9
8
7
6
CH1
AMP
1
X401
38kHz
RV403
LPF
IC403
STEREO MPX
+5V
REG
Q404
B+
SWITCH
IC402
ANT401
D401
POWER
AUDIO IN
B
A
MOD
DI
CL
CE
DI
CL
CE
ANT
5V
T-OUT
B+
5V
5V
(VCO UNIT)
I
MODULATION
S402
CHANNEL
1
2
3
J404
DC IN 9V
Q402
+3.6V
REG
13
1
1
3
IC401
ON
(STEREO COMPOSITE SIGNAL)
3.6V
B+
3.6V
B+
B+
IC405 (2/2)
COMP.
7
5
6
B+
IC405 (1/2)
COMP.
1
3
2
15
6
7
9
12
13
11
IC404
SYSTEM CONTROL
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