TMR-RF875R AEP Model UK Model SERVICE MANUAL TRANSMITTER SPECIFICATIONS Headphones MDR-RF875R Transmitter TMR-RF875R TMR-RF875R is the component model block one in the MDR-RF875RK. COMPONENT MODEL NAME FOR MDR-RF875RK General Carrier frequency 863.5 – 864.5 MHz Channel Ch1, Ch2, Ch3 Modulation FM stereo Frequency response 18 – 22,000 Hz Transmitter Power source DC 9 V: supplied AC power adaptor Audio input phono jacks/stereo mini jack Dimensions Approx. 130 × 135 × 150 mm (5 1 /4 × 5 3 /8 × 6 in.) (w/h/d) Mass Approx. 200 g (7 oz.) Design and specifications are subject to change without notice. Ver 1.0 2000. 08
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TMR-RF875RAEP Model
UK ModelSERVICE MANUAL
TRANSMITTER
SPECIFICATIONS
Headphones MDR-RF875R
Transmitter TMR-RF875R
TMR-RF875R is the component model block one in the MDR-RF875RK.
COMPONENT MODEL NAME FOR MDR-RF875RK
GeneralCarrier frequency
863.5 – 864.5 MHz
Channel Ch1, Ch2, Ch3Modulation FM stereo
Frequency response
18 – 22,000 Hz
Transmitter
Power source DC 9 V: supplied AC poweradaptor
Audio input phono jacks/stereo mini jackDimensions Approx. 130 × 135 × 150 mm
(5 1/4 × 5 3/8 × 6 in.) (w/h/d)
Mass Approx. 200 g (7 oz.)
Design and specifications are subject to change withoutnotice.
Ver 1.0 2000. 08
— 2 —
SECTION 1GENERAL
This section is extractedfrom instruction manual.
DC IN 9VOFF ON
FILTERNOISE1 2 3
CHANNELRB A L
AUDIO IN
Setting up thetransmitter1 Connect the transmitter to audio/video
equipment. Select one of the hookupsbelow depending on the jack type:
A To connect to a headphone jack
Transmitter
Left channel(white)
Right channel(red)
Unimatch plugadaptor(supplied)
CD Walkman,MD Walkman,WALKMAN*,VCR, etc.
to headphonesjack (stereomini jack)
Connecting cord(supplied)
to AUDIO INA jacks
to headphonesjack (stereophone jack)
Notes on chip component replacement• Never reuse a disconnected chip component.• Notice that the minus side of a tantalum capacitor may be
damaged by heat.
Flexible Circuit Board Repairing• Keep the temperature of soldering iron around 270˚C
during repairing.• Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).• Be careful not to apply force on the conductor when soldering
or unsoldering.
— 3 —
SECTION 2DISASSEMBLY
2-1. HOUSING (UPPER)
2-2. TX-BASE BOARD
Note : Follow the disassembly procedure in the numerical order given.
2-3. CHG-NR BOARD
1 Four screws (P 2 × 8)
Housing (upper)2
3 TX-BASE board
2
1 Screw (P 2 × 6)
Screw
Housing (upper)
Housing (upper)
2 CHG-NR board
1 Four screws (P 2 × 6)
— 4 —
Setting :
SECTION 3ELECTRICAL ADJUSTMENTS
Transmission Frequency Check1. Set the noise filter SW 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-BASE board close to the frequency counter, then mea-
sure the frequencies of CH1, CH2 and CH3 and make sure thevalues are as follows:
When the frequency does not satisfy the specified value, ex-change the vco unit. When completed with replacement, recheckthe frequecies of CH1, CH2 and CH3.
Compresser Output Check1. Set the channel to CH2.2. Input a signal of 1 kHz, 316 mVrms to L-CH and R-CH of J402.3. Measure IC 601 pin 7 and IC 602 pin 7 on the CHG-NR board
using a digital voltmeter (AC range) and confirm the value is100 mVrms ± 5mV (Fig.1).
4. Input a signal of 1 kHz, 31.6 mVtms to L-CH and R-CH of J402.5. Measure IC 601 pin 7 and IC 602 pin 7 on the CHG-NR board
using a digital voltmeter (AC range) and confirm the value is31.6 mVrms ± 5 mV (Fig.1).
6. When the frequency is not satisfied the specified value, exchangeTX- BASE board or CHG-NR board.
AF signal generator
Telescopicantenna
8 cm
L-CH / R-CH (J402)
TMR-RF875R
set
TMR-RF875R
set
Frequency counter
Pilot Signal and MPX Signal Modulation Check andAdjustment1. Set the channel to CH2.2. No signal input (The operating time in this case is limited to 4
or 5 minutes.)3. See the RV402 and RV403 to max. (clockwise)4. Connect a digital voltmeter (AC range) to the movable terminal
of RV403 (Fig.2).5. Adjust the value of the digital voltmeter to minimum by RV401.6. See the RV402 to minimum. (counter clock wise)7. Adjust the value of the digital voltmeter to max by L407.8. Adjust the value of the digital voltmerter to 1.7 mVrms ± 0.1
mV by RV403.9. Connect a digital voltmeter (AC range) with LPF to movable
terminal of RV403 (Fig.2).10. Input a signal of 1 kHz, 316 mVrms to only the L-CH.11. Adjust the value of the digital voltmeter to 2.5 mVrms ± 0.2
mV by RV402.
Connection points and Adjustment Location :
S402 J402
(L-CH) (R-CH)CH3 ←CH2 ←CH1
VCO UNIT
RV403RV402
RV401
L407R464
IC 602
IC 601
1 8
4 5
1 8
4 5
CHG-NR board
+–
digitalvoltmeter(AC range)
(Fig. 1)
7 pin
RV401-403,L407Modulationcheck andadjustment.
+–
digitalvoltmeter(AC range)
(Fig. 2)
R464
TMR-RF875R
4-1. BLOCK DIAGRAM
— 5 — — 6 —
SECTION 4DIAGRAMS
Note on Printed Wiring Board:• 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 Ω and 1/4 W or less unless otherwise specified.• ¢ : internal component.• A : B+ Line.• H : adjustment for repair.• Power voltage is dc 9 V and fed with regulated dc power supply
from battery terminal.• Voltages are dc with respect to ground under no-signal conditions.• Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal production toler-ances.
• Waveforms are taken with a oscilloscope.Voltage variations may be noted due to normal production toler-ances.
• Circled numbers refer to waveforms.• Signal path.L: AUDIO
J401
S401
NOISE FILTER
NOISEFILTER
CH1AMP BUFFER
BUFFERQ401
RECTD404,405
2VD408
INPUTDET
DIVIDER
BUFFER
OSCAMP
TIMEDEVISION
MPXAUDIO IN
B
J402
A
OFF|
ON
S402
CHANNEL
L
R R-CH
R-CH
R-CH
14
12 11
9
8
13
10
1211
679
15
76
CH2AMP1
X40138kHz
RV402
RV401
L407
RV403
MOD IN
CE DI CL
CE DI CL
VS
165VVCO CONTROLLER
IC404
IC401 IC601
SWITCH
Q403
LPF
IC403STEREO MPX
IC405(1/2)
IC405(2/2)
+5VREG
SWITCHQ404
SWITCHQ601
SWITCHQ602
SWITCHQ604
SWITCHQ603
OSCQ605
+4VQ402
REF V
POWER OFFDET
IC604(2/2)
DETECTIC402
+5VREG
IC605
COMPARATOR
IC603
DETECT
IC604(1/2)
ANT
5V
B+
T-OUT
ANT401
D401
D402
J404
DC IN 9V
CHARGE
(power)
(chg)
1
2
3
VCO UNIT
MODULATION
MODULATION MODULATION
MODULATION
72113
• R-ch is omitted due to same as L-ch.• Signal path. L : AUDIO16
IC401 8-759-998-71 IC BA3308FIC402 8-759-537-90 IC KIA78S05P-TPIC403 8-759-667-59 IC NJM2035M(TE2)IC404 8-759-679-76 IC KMP47C101M-1B54IC405 8-759-510-73 IC BA10393F-E2
< JACK >
J401 1-566-822-51 JACK (AUDIO IN B)J402 1-580-441-61 JACK, PIN 2P (AUDIO IN A)J404 1-785-066-11 JACK,DC (POLARITY UNIFIED TYPE) (DC IN 9V)
< JUMPER >
JC421 1-216-295-11 SHORT 0JC422 1-216-296-91 SHORT 0JC423 1-216-296-91 SHORT 0JC424 1-216-296-91 SHORT 0JC425 1-216-296-91 SHORT 0
JC430 1-216-295-11 SHORT 0JC431 1-216-295-11 SHORT 0
— 16 —
Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks
SECTION 6ELECTRICAL PARTS LIST
NOTE:• Due to standardization, replacements in the
parts list may be different from the partsspecified in the diagrams or the componentsused on the set.
• -XX, -X mean standardized parts, so theymay have some difference from the originalone.
• Items marked “*” are not stocked since theyare seldom required for routine service.Some delay should be anticipated whenordering these items.
• CAPACITORS:uF: µF
• RESISTORSAll resistors are in ohms.METAL: metal-film resistorMETAL OXIDE: Metal Oxide-film resistorF: nonflammable
IC401 8-759-998-71 IC BA3308FIC402 8-759-537-90 IC KIA78S05P-TPIC403 8-759-667-59 IC NJM2035M(TE2)IC404 8-759-679-76 IC KMP47C101M-1B54IC405 8-759-510-73 IC BA10393F-E2
< JACK >
J401 1-566-822-51 JACK (AUDIO IN B)J402 1-580-441-61 JACK, PIN 2P (AUDIO IN A)J404 1-785-066-11 JACK,DC (POLARITY UNIFIED TYPE) (DC IN 9V)
< JUMPER >
JC421 1-216-295-11 SHORT 0JC422 1-216-296-91 SHORT 0JC423 1-216-296-91 SHORT 0JC424 1-216-296-91 SHORT 0JC425 1-216-296-91 SHORT 0
JC430 1-216-295-11 SHORT 0JC431 1-216-295-11 SHORT 0
Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks
IC601 8-759-384-88 IC TK10690MIC602 8-759-384-88 IC TK10690MIC603 8-759-678-31 IC TB1004AFIC604 8-759-510-73 IC BA10393F-E2IC605 8-759-537-90 IC KIA78S05P-TP
< JUMPER >
JC601 1-216-295-11 SHORT 0JC602 1-216-295-11 SHORT 0