Sony SRS-RF90RK - Wireless Speaker Sys User manual

Sony Corporation
Personal Audio Company
Published by Sony Engineering Corporation
9-873-530-01
2002B1600-1
© 2002.02
SRS-RF90R/RF90RK/
TMR-RF90
US Model
Canadian Model
SERVICE MANUAL
WIRELESS STEREO SPEAKER SYSTEM
SPECIFICATIONS
Ver 1.0 2002. 02
General
Carrier frequency 913.5 – 914.5 MHz
Channel Ch1, Ch2, Ch3
Modulation FM stereo
Transmitter (SRS-RF90RK only)
Power source DC 9 V: supplied AC power adaptor
(AC-S901)
Audio input phono jacks/stereo mini jack
Input impedance 33 kΩ/51 Ωswitchable
Dimensions Approx. 136 ×136 ×100 mm
(6 ×6 ×4 1/3in.) (w/h/d)
Mass Approx. 146 g (5.2 oz.)
Speaker system SRS-RF90RK, SRS-RF90R
Speaker system 2 way magnetically shielded
Enclosure type Bass reflex
Speaker units tweeter: 30 mm ×2
woofer: 57 mm ×1
Power source DC 9 V: supplied AC adaptor (AC-S906T)
Rated output Built in amplifiers total 4W (while
using the supplied AC adaptor)
* power output:
Tweeter: 0.25W + 0.25W < 10%
T.H.D., 5 kHz 24 ohms
Woofer: 3.5W < 10% T.H.D., 1kHz
6 ohms
Dimensions Approx. 234 ×300 ×126 mm
( 9 1/4×11 7/8×5 in.) (w/h/d)
Mass Approx. 905 g (31.9 oz.) incl.
built-in rechargeable battery
Built-in Ni-Cd rechargeable battery
Voltage 7.2 V
Capacity 700 mAh
Duration time Approx. 4 hours
(with the 10 mW reflector light OFF)
Charging time Approx. 28 hours (from fully
discharged to fully charged)
Supplied accessory
The transmitter (SRS-RF90RK only)
AC adaptor (2 for SRS-RF90RK) (1 for SRS-RF90R)
Connecting cord phono plug-stereo miniplug (1m) (1)
Operating instructions (1)
Design and specifications are subject to change without
notice.
SRS-RF90RK
Wireless Active Speaker SRS-RF90R
RF Transmitter TMR-RF90
• SRS-RF90RK is composed of following models.
COMPONENT MODEL NAME
SRS-RF90R TMR-RF90
• SRS-RF90R is sold as single model too.

2
SRS-RF90R/RF90RK/TMR-RF90
TABLE OF CONTENTS
1. GENERAL ·········································································· 4
2. DISASSEMBLY
2-1. Grille bracket ································································· 5
2-2. Front cabinet section, Rear cabinet section ··················· 6
2-3. Nickel cadmium battery, Speaker (057F022) ················ 6
2-4. Cabinet (Top section), JACK Board, RX board ············ 7
2-5. CHARGE board, SW board ·········································· 7
2-6. AMP board, MEGABASS board,
REFLECTOR board ······················································ 8
2-7. Drive (030F034) ···························································· 8
3. ELECTRICAL ADJUSTMENTS ································· 9
4. DIAGRAMS ······································································ 12
4-1. Block Diagrams
– SRS-RF90R – ··························································· 13
– TMR-RF90 – ···························································· 14
4-2. Printed Wiring Boards (SRS-RF90R)
– RX Bord Section – ··················································· 15
4-3. Schematic Diagram (SRS-RF90R)
– RX Bord Section – ··················································· 16
4-4. Printed Wiring Boards (SRS-RF90R)
– AMP Bord Section – ················································ 17
4-5. Schematic Diagram (SRS-RF90R)
– AMP Bord Section – ················································ 18
4-6. Printed Wiring Board (TMR-RF90) ···························· 19
4-7. Schematic Diagram (TMR-RF90) ······························· 20
5. EXPLODED VIEWS
5-1. Front Cabinet Section (SRS-RF90R) ·························· 21
5-2. Rear Cabinet Section (SRS-RF90R) ··························· 22
5-3. TMR-RF90 ·································································· 23
6. ELECTRICAL PARTS LIST ······································· 24

3
SRS-RF90R/RF90RK/TMR-RF90
SERVICING NOTE
Note : In the place of a mark, as shown in figure, the wires are taken about.
( Rear side ) tape cushion
cushion
( Front side )
Leading about of wiring

4
SRS-RF90R/RF90RK/TMR-RF90 SECTION 1
GENERAL
This section is extracted from
instruction manual.
1First turn on the audio/video equipment
and start playing.
The power indicator of the transmitter
will light up.
2Turn on the speaker system.
The power indicator of the speaker
system will light in red.
3Select the radio frequency with the
CHANNEL selector.
123
CHANNEL
1Connect the speaker system to a power
source.
AC power adaptor (supplied)
Tweeter
(left)
Tweeter
(right)
To an AC
outlet
OFF yON The switch of the
reflector light
POWER switch
POWER indicator
High
Low
TUNING
button VOLUME control
2The CHARGE indicator on the speaker
system will light up to indicate that the
battery is being charged.
CHARGE indicator
ATo connect to a LINE OUT or REC OUT BTo connect to headphones jack
DC IN 9V
OFF ON
FILTERNOISE
123
CHANNEL
RBAL
AUDIO IN
Transmitter
to AUDIO IN
B jack
Connecting cord
(supplied)
Right channel
(red)
Left channel
(white)
to LINE OUT or REC
OUT jacks
Stereo system, VCR, etc.
DC IN 9V
OFF ON
FILTERNOISE
123
CHANNEL
RBAL
AUDIO IN
Transmitter
Left channel
(white)
Right channel
(red)
Connecting cord
(supplied)
to AUDIO IN
A jacks
Unimatch plug
adaptor (not
supplied)
Discman, MD,
WALKMAN*, VCR,
etc.
to headphones
or LINE OUT jack
(stereo mini jack)
to headphones
jack (stereo
phone jack)
SRS-RF90R
TMR-RF90

5
SRS-RF90R/RF90RK/TMR-RF90
SECTION 2
DISASSEMBLY
Note : Disassemble the unit in the order as shown below.
2-1. Grille Bracket
Note : This set can be disassembled in the order shown below.
FRONT CABINET SECTION,
REAR CABINET SECTION
(Page 6)
GRILLE BRACKET
(Page 5)
SET(SRS-RF90R)
NICKEL CADMIUM BATTERY,
SPEAKER(057F022)
(Page 6)
CABINET(TOP SECTION),
JACK BOARD, RX BOARD
(Page 7)
AMP BOARD,
MEGABASS BOARD,
REFRECTOR BOARD
(Page 8)
CHARGE BOARD,
SW BOARD,
(Page 7)
DRIVE(030F034)
(Page 8)
2 jack holder
4 grille bracket
(Cautions)
(Cautions)
Please also exchange grille (Dia. 57) together at a Grille bracket.
(A grille (Dia. 57) is unreproducible.)
3 grille (Dia. 57)
(Cautions)
1 three screws
(+P 3
× 10)
The cautions at the time of attachment :
When you attach a grille (Dia. 57), please unite
a position by cut of a grille (Dia. 57).

6
SRS-RF90R/RF90RK/TMR-RF90
2-2. Front Cabinet Section, Rear Cabinet Section
2-3. Nickel Cadmium Battery, Speaker (057F022)
6 eight screws
(+BVTP 3
× 12)
2 three screws
(+P 3
× 10)
4 two screws
(+P 3
× 10)
1 reflector
8 connector
(CN203)
7 connector
(CN802)
3 jack holder
5 stand
rear cabinet section
9 front cabinet section
2 two claws
4 nickel. cadmium battery
3 retainer board
1 screws
(+BVTP 3
× 10)
5 t wo screws
(+BVTP 3
× 10)
6 speaker (057F022)
front cabinet

7
SRS-RF90R/RF90RK/TMR-RF90
2-4. Cabinet (Top Section), JACK board, RX board
2-5. CHARGE board, SW board
1 connector (CN302)
7 connector (CN801)
8 connector
(CN804)
qa connector
(CN101)
qs antenna
qd RX boar
d
4 connector (CN304)
6 cabinet
(top section)
2 connector
(CN301)
3 power button
q; JACK board
5 two screws
(+BVTP 3
× 10)
9 screw (DIA. 12)
rear cabinet
3 CHARGE board
5 SW board
2 connector (CN303
)
1 screw
(+P 2.6 × 4)
4 two screws
(+P 2.6 × 6)
top cover section

8
SRS-RF90R/RF90RK/TMR-RF90
2-6. AMP board, MEGABASS board, REFLECTOR board
2-7. Drive (030F034)
6 AMP board
8 MEGABASS board
7 Remove eight solderings.
2 connector (CN202)
9 connector (CN304)
5 connector (CNP201
)
4 connector (CNP202)
qa REFLECTOR board
3 screw
(+P 2.6
× 6)
q; screw
(+P 2.6
× 6)
1 power button
1 screw
(+BVTP 3
× 10)
8 screw
(+BVTP 3
× 10)
2 screw
(+P 2.6
× 6)
9 screw
(+P 2.6
× 6)
3 Remove two solderings.
4 herness
qa herness
6 MDD holder (R)
qd MDD holder (L)
7 drive (030F034)
qf drive (030F034)
5 grille (DIA. 30)
qs grille (DIA. 30)
q; Remove the soldering.
When you remove a Cautions : (R) side, please start with
1 , when you remove the (L) side, please start with 8 .

9
SRS-RF90R/RF90RK/TMR-RF90
SECTION 3
ELECTRICAL ADJUSTMENTS
Transmission Frequency Check and Adjustment
1. Set the NOISE FILTER switch to off.
2. Input a signal of 1 kHz 40 mVrms to only the L-CH (J402).
3. Connect a telescopic antenna to the frequency counter input and
extend the antenna to a length of approximately 8 cm.
4. Place TX board close to the frequency counter, then measure the
frequencies of CH1, CH2 and CH3 and make sure the values are
as follows:
CH1 : 913.5 MHz ± 200 kHz
CH2 : 914.0 MHz ± 200 kHz
CH3 : 914.5 MHz ± 200 kHz
When the frequency is not satisfied the specified value, set the
CHANNEL switch (S402) to CH2, then adjust the value of the
frequency counter to 914.0 MHz by trimmer capacitor in theVCO
unit.
Standard value :913.9MHz to 914.1MHz
When completed with replacement, recheck the
frequencies of CH1, CH2 and CH3.
Setting :
AF signal
generator
Telescopic
antenna
8 cm
L-CH (J402)
TMR-RF90
set
TMR-RF90
set
Frequency counter
Modulation Check and Adjustment
1. Set the channel to CH2.
2. An electric wave is output for 5or 10 minutes when off to on a
power supply (Power indicator will on).
3. Measure the center terminal of RV403 using an digital volt-meter
(AC range) and make sure the value is 2 to 2.5mVrms.
If the measured value is other than the specified value, adjust to
2 to 2.5mVrms by turning the RV403 on the TX board.
Connection points and Adjustment Location :
(Component side)
S402
Hole
J402
(L-CH) (R-CH)
CH3
← CH2 ← CH1
RV403: Modulation adjustment
Trimmer : Transmission
frequency adjustmen
t
VCO UNIT
RV403
IC402
digtal voltmeter
(AC range)
(Conductor side)
TX BOARD
TX BOARD
TMR-RF90

10
SRS-RF90R/RF90RK/TMR-RF90
Notes:
1. Use transmitter with check and adjustment already completed.
2. On adjusting the speaker section, use the transmitter as a
jig.
Wireless Active Speaker : SRS-RF90R
Transmitter : TMR-RF90
Procedure:
1. Connect an oscillator with attenuator and terminator (600 Ω)
to the transmitter AUDIO IN-A connector (J402).
2. Connect an AC adapter to the transmitter DC IN 9V jack (J404).
3. Short between Q101 corrector and GND on the RX board.
4. Connect an AC adapter to the speaker DC IN 9V jack (J801).
5. Connect lead wires to IC101 pin 4, pin 6, pin 7 and GND on
the RX board.
6. Connect a resistor 33k Ωbetween IC101 pin 4 and pin 7.
7. Connect lead wires to the speakers’terminals (L+,L-,R+,R-)
on the AMP board.
Free Run Frequency Check and Adjustment
1. Set the transmitter AUDIO IN-A connector (J402) to no signal.
Note: In this case, operation time is about 5 or 10 minutes.
Perform confirmation for less than 5 minutes.
2. Check the transmitter power indicator D401 (red) lights.
3. Set the transmitter CHANNEL switch to 1.
4. Connect DC 1.2V across TP102 and GND on the RX board.
5. Connect a frequency counter to IC101 pin 4 and GND on the
RX board, then confirm the frequency within 76kHz
± 50Hz
6. When the frequency dose not satisfy the specified value, adjust
the value of the frequency counter to specification by RV101
on the RX board.
Specified values: 76kHz ± 50Hz.
7. Remove a 33 kΩ resister between IC101 pin 4 and pin 7.
Setting :
Receiving Frequency Check and Adjustment
1. Set the transmitter CHANNEL switch to 2.
2. Set the transmitter NOISE FILTER switch to off.
3. Input a signal of 1kHz, 316mVrms to transmitter AUDIO IN-
A(L-ch) connector only.
4. Keep distance between transmitter and speaker to 5 meters over.
5. Set the speaker volume (RV301) to minimum.
6. Connect DC1.2V across TP102 and GND.
7. Connect an oscilloscope CH1 and CH2 to IC101 pin 6 and pin 4.
8. Check the waveform of the oscilloscope to CH1 is demodulated
1kHz signal and CH2 is GND.
9. If CH1 and CH2 are not satisfied in step 8, adjust the coil (L101)
on the RX board to satisfied step 8.
10. Disconnect DC1.2V across TP102 and GND.
11. Open between Q101 corrector and GND on the RX board.
12. Switch the transmitter off and push the TUNE switch (S301).
Check the waveform of the oscilloscope at the TP102 as follows:
13. Switch on the transmitter again.
14. Set the transmitter CHANNEL switch to 1.
15. Push the TUNE switch (S301) to receive radio frequency.
16. Check same step 8.
17. Set the transmitter CHANNEL switch to 3.
18. Push the TUNE switch (S301) to receive radio frequency.
19. Check same step 8.
Carrier Modulation Check
1. Set the transmitter CHANNEL switch to 2.
2. Set the transmitter NOISE FILTER switch to off.
3. Input a signal of 1kHz, 316mVrms to transmitter AUDIO IN-A
(L-ch) connector only.
4. Set the speaker volume (RV301) to minimum.
5. Connect an oscilloscope CH1 and CH2 to IC101 pin 6 and pin 4.
6. Push the TUNE switch (S301) to receive radio frequency.
7. Check the waveform of the oscilloscope that the CH1 is
demodulated 1kHz signal and CH2 is GND.
8. Connect an AC voltmeter with LPF to IC101 pin 6 and GND.
9. Check the value of the AC voltmeter to 26mVrms ± 2mV
Setting :
Separation Check
1. Set the transmitter CHANNEL switch to 2.
2. Set the transmitter NOISE FILTER switch to off.
3. Input a signal of 1kHz, 316mVrms to transmitter AUDIO IN-A
(L-ch) connector only.
4. Connect an oscilloscope CH1 to speakers terminal (L+,L-) and
CH2 to IC101 pin 4 and GND.
5. Push the TUNE switch (S301) to receive radio frequency.
6. Check the waveform of the oscilloscope that the CH1 is
demodulated 1kHz signal and CH2 is GND.
7. Connect an AC voltmeter with LPF to speakers terminal
(L+,L-).
8. Adjust the value of the AC voltmeter to specification by
speaker volume RV301.
Specified values: 155mVrms
9. Connect an AC voltmeter with LPF to speakers terminal
(R+,R-).
10. Measure the value of the AC voltmeter.
11. Check the difference of the L and R to more than 20dB.
12. Input a signal of 1kHz, 316mVrms to transmitter AUDIO IN-A
(R-ch) connector only.
13. Connect an AC voltmeter with LPF to speakers terminal
(R+,R-).
14. Adjust the value of the AC voltmeter to specification by
speaker volume RV301.
Specified values: 155mVrms
15. Connect an AC voltmeter with LPF to speakers terminal
(L+,L-).
16. Measure the value of the AC voltmeter.
Setting :
+
–
regulated power supply
(DC 1.2V)
TP102 IC101 pin4
frequency counter
+
–
GND
1.8V
2-3sec 0.6V
Waveform of
auto-tuning
voltage at
the TP102
+
–
regulated power supply
(DC 1.2V) (from step 6 to step 9)
TP102 +
–
+
–
IC101 pin6 IC101 pin4
oscilloscope
(step 8, step 16, step 19)
CH1 CH2
SRS-RF90R
Setting :
+
–
TP102
oscilloscope
CH1
+
–
digital voltmeter
(AC range)
LPF
IC101
pin6
33000P
2.2K
+
–
+
–
IC101
pin6 IC101
pin4
oscilloscope
CH1 CH2

11
SRS-RF90R/RF90RK/TMR-RF90
Asjustment Location :
+
–
digital voltmeter
(AC range)
L+ / R+
L–/ R–
+
–
+
–
L+ IC101 pin
4
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 Frequenc
y
Adjustment
GND L101:
Receiving Frequency
Adjustment
TP102
RX BOARD
(Conductor side)

12
SRS-RF90R/RF90RK/TMR-RF90 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 µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
•All resistors are in Ωand 1/4W 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 MΩ).
Voltage variations may be noted due to normal produc-
tion tolerances.
•Signal path.
K
L:AUDIO
: FM
• CIRCUIT BOARDS LOCATION (SRS-RF90R)
RX board
CHARGE board
AMP board
JACK board
SW board
REFLECTOR board
MEGABASS board

1313
SRS-RF90R/RF90RK/TMR-RF90
4-1. Block Diagrams
(SRS-RF90R)
• 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 1316 FM IF/
DISCRI
DECODE
AMP
DETUNE
MUTE
TUNING
IND
STEREO
IND
CF102
10.7MHz
26
CF101
10.7MHz
6
5R-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
OFFON
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
72
3
1
IC104
D-FF
IC201
AMP
31
TRANSMISSION
FREQUENCY
L101

1414
SRS-RF90R/RF90RK/TMR-RF90
(TMR-RF90)
•R-ch is omitted due to same as L-ch.
•Signal path.
L: AUDIO
F : FM
J401
S401
NOISE FILTER
NOISE
FILTER
ALC
AMP CH2
AMP BUFFER
Q401
BUFFER
D404,405
RECT
INPUT
DET
DIVIDER
BUFFER
OSC
AMP
TIME
DIVISION
MPX
J402
OFF
L
R R-CH
R-CH
R-CH
R-CH
14 9
8
76
CH1
AMP
1
X401
38kHz
RV403
LPF
IC403
STEREO MPX
+5V
REG
Q404
B+
SWITCH
IC402
ANT401
D401
POWER
AUDIO IN
B
A
MOD IN ANT
5V
B+
5V
(VCO UNIT)
I
MODULATION
Q408
CHANNEL
SET
S402
CHANNEL
1
2
B+
5V
3
Q402,405
J404
DC IN 9V
Q406
POWER
ON/OFF
13 1
1 3
IC401
ON
(STEREO COMPOSITE SIGNAL)

1515
SRS-RF90R/RF90RK/TMR-RF90
4-2. Printed Wiring Boards (SRS-RF90R) – RX Board Section –
Ref. No. Location
D101 D-3
D102 D-2
D103 B-4
D601 F-6
D602 F-6
D701 F-9
IC101 C-3
IC102 D-3
IC103 C-4
IC104 C-3
IC105 B-3
Q101 B-4
Q102 B-4
Q103 C-4
Q104 B-3
Q105 C-2
Q106 C-2
Q107 C-2
• Semiconductor
Location
12
A
B
C
D
E
F
345678910
IC105
IC101
IC104
IC103
IC102
TO
17
TO
17
FE UNIT

1616
SRS-RF90R/RF90RK/TMR-RF90
4-3. Schematic Diagram (SRS-RF90R) –RX Board Section –
•IC Block Diagram
IC104 TC7W74FU
1 2 3 4
8 7 6 5
S
C
DQ
Q
R
Vcc PR CLR Q
CK D Q GND

1717
SRS-RF90R/RF90RK/TMR-RF90
4-4. Printed Wiring Boards (SRS-RF90R) –AMP Board Section –
12
A
B
C
D
E
F
3456789
IC201
IC202
IC203
TO
TO
RECHARGEABLE
BATTERY
(NICKEL-CADMIUM)
6PCS. 7.2V
Ref. No. Location
D201 B-4
D202 B-4
D203 D-5
D204 C-6
D801 E-1
IC201 D-7
IC202 B-6
IC203 B-5
Q202 C-4
Q203 C-4
Q204 D-6
Q901 E-8
•Semiconductor
Location

1818
SRS-RF90R/RF90RK/TMR-RF90
4-5. Schematic Diagram (SRS-RF90R) – AMP Board Section –
• IC Block Diagram
IC202, 203 TEA2025B
DECOUPLING
CIRCUIT
START
PROTECT
THERMAL
12345678
14131211109 15 16
11
22

1919
SRS-RF90R/RF90RK/TMR-RF90
4-6. Printed Wiring Board (TMR-RF90R)
IC401
IC402
IC403
VCO UNIT
12
A
B
C
D
E
F
3456
Ref. No. Location
D401 E-3
D403 B-4
D404 E-2
D405 E-2
D406 E-3
D408 E-5
D409 D-4
D410 E-4
IC401 C-2
IC402 C-5
IC403 E-4
Q401 E-1
Q402 E-3
Q404 C-5
Q405 D-3
Q406 E-3
Q408 C-5
•Semiconductor
Location

2020
SRS-RF90R/RF90RK/TMR-RF90
4-7. Schematic Diagram (TMR-RF90)
•Waveforms
1IC403 6TO CRYSTAL
2IC403 8PILOT OUTPUT
0.58 Vp-p
52.6
µ s
1.8 Vp-p
26.3 µ s
500mV/DIV, 10 µ s /DIV
200mV/DIV, 20 µ s /DIV
D401
POWER