DOWNLOAD Sony SRS-RF80R / SRS-RF80RK / TMR-RF80 Service Manual ↓ Size: 5.27 MB | Pages: 29 in PDF or view online for FREE

Model
SRS-RF80R SRS-RF80RK TMR-RF80
Pages
29
Size
5.27 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
srs-rf80r-srs-rf80rk-tmr-rf80.pdf
Date

Sony SRS-RF80R / SRS-RF80RK / TMR-RF80 Service Manual ▷ View online

9
SRS-RF80R/RF80RK/TMR-RF80
SECTION 3
ELECTRICAL ADJUSTMENTS
Setting :
AF signal 
generator 
Telescopic
antenna
8 cm
L-CH (J402)
TMR-RF80
set 
TMR-RF80
set 
Frequency counter 
(Component side)
S402
J402
(L-CH) (R-CH)
CH3 
CH2 
CH1
RV403: Modulation adjustment
VCO UNIT
RV403
IC402
digtal voltmeter
(AC range)
 (Conductor side)
TX BOARD
TX BOARD
TMR-RF80
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 : 863.5 MHz ± 40 kHz
CH2 : 864.0 MHz ± 40 kHz
CH3 : 864.5 MHz ± 40 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 the VCO
unit.
Standard value :913.9MHz to 914.1MHz
When completed with replacement, recheck the
frequencies of CH1, CH2 and CH3.
Modulation Check and Adjustment
1. Set the channel to CH2.
2. An electric wave is output for 4 or 5 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 :
10
SRS-RF80R/RF80RK/TMR-RF80
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-RF80R
RF Transmitter
: TMR-RF80
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 
Ω between 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 4 or 5 minutes.
     Perform confirmation for less than 4 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 k
Ω 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-RF80R
Setting :
+
TP102
oscilloscope
CH1
+
digital voltmeter
(AC range)
LPF
IC101
pin6
33000P
2.2K
+
+
IC101 
pin6
IC101 
pin4
oscilloscope
CH1
CH2
11
SRS-RF80R/RF80RK/TMR-RF80
Asjustment Location :
+
digital voltmeter
(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
 resistor)
IC101 
6
RV101:
Free Run Frequency
Adjustment
GND
L101:
Receiving Frequency
Adjustment
TP102
RX BOARD   
(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.
• All resistors are in 
 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
).
Voltage variations may be noted due to normal produc-
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
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