Sony MDR-RF815R User manual

MDR-RF815R
AEP Model
UKModel
SERVICE MANUAL
HEADPHONES
Headphones MDR-RF815R
Transmitter TMR-RF815R
MDR-RF815R is the component model block one in the MDR-RF815RK.
COMPONENT MODEL NAME FOR MDR-RF815RK
SPECIFICATIONS
Headphones
Power source DC 2.4 V: Built-in rechargeable
battery
Mass Approx. 240 g (8.1 oz.) incl.
built-in rechargeable battery
Built-in Ni-Cd rechargeable battery
Model name NC-AA
Voltage 1.2 V
Capacity 700 mAh
Design and specifications are subject to change without
notice.
Ver 1.0 2000. 06

— 2 —
SECTION 1
GENERAL
5 -BTurn up the volume to a moderate
level with the VOL control, then
tune the headphones in to the
frequency of the transmitter with the
TUNING control until you can hear
the audio signal loud and clear.
BMDR-RF815R
TUNING
control
VOL control
Auto power on/off function
When you remove the headphones from your
head, the power turns off automatically. Do not
allow the self adjusting band to be pulled up,
otherwise the headphones will be switched on.
The power turns on.
This section is extracted
from instruction manual.
1. Check theareaofyourrepair for unsolderedor poorly-soldered
connections. Checkthe entire boardsurface forsolder splashes
and bridges.
2. Check the interboard wiring to ensure that no wires are
"pinched" or contact high-wattage resistors.
3. Look for unauthorized replacement parts, particularly
transistors, that were installed during a previous repair. Point
them out to the customer and recommend their replacement.
4. Look for partswhich, through functioning, show obvious signs
of deterioration. Point them out to the customer and
recommend their replacement.
5. Check the B+ voltage to see it is at the values specified.
6. Flexible Circuit Board Repairing
• Keep the temperature of the 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
SAFETY CHECK-OUT
After correcting the original service problem, perform the following
safety checks before releasing the set to the customer.

— 3 —
SECTION 2
DISASSEMBLY
3 Remove the
nine solderings.
8 Remove the two solderings.
RX-BASE board
Solder the each lead wires directly to the position as shown
while being cautions of colors.
Precaution for installtion
Precaution for installtion
6 RX-BASE board
9 Switch, push (1 key)
Cover (R), hanger
No.203 No.203 (black)
No.202 (red)
No.201 (green)
No.201
No.204
No.205
No.204
No.202
4 Screw (P 2 × 8)
1 Four screws (P 2 × 6)
2 Set the psuh
switch (1 key).
Suspender
1 Slide the suspender in the
direction of the arrow.
Claw
Claw
2
5
7
2-1. RX-BASE BOARD
Note : Follow the disassembly procedure in the numerical order given.

— 4 —
No.201
Cover (L), hanger
Cover (L), hanger
No.203
No.201, No.203
No.201, No.203
Groove
Set the lead wires
No.204
No.205
No.202 No.202
No.203
No.201
Set the each lead wires as illustrated below.
Cover (R), hanger
A
B
Cover (R), hanger
Groove
Groove
Groove
Groove
Groove
To the driver (030F032//K).
To the RX-BASE board
Groove
To the driver (030F032//K).
B
A

— 5 —
SECTION 3
ELECTRICAL ADJUSTMENTS
Notes:
1. Use transmitter with check and adjustment already completed.
2. On adjusting the headphones section, use the transmitter as a
jig. Headphones:MDR-RF815R
Transmitter:TMR-RF815R
Procedure:
1. Connect an oscillator with attenuator and terminator (600 Ω)
to the transmitter AUDIO IN-A connector (J402).
2. Connect anACadapterto thetransmitter DC IN9V jack (J404).
3. Connect lead wires to IC301 pin 4, pin 6, pin 7 and GND on
the RX-BASE board.
4. Connect a resistor 33k Ωbetween IC301 pin 4 and pin 7.
5. Connect lead wires to the speakers’ terminals (L+,L-,R+,R-)
on the RX-BASE board.
3-1. Free run frequency check and adjustment
1. Set the transmitterAUDIO IN-A connector (J402) to no signal.
Note: In this case, operation time is about 4 or 5 minutes.
2. Check the transmitter power indicator (red) lights.
3. Set the transmitter CHANNEL switch to 1.
4. Set the head phones tuning (RV303) to center position.
5. Connect a frequency counter to IC301 pin 4 and GND on the
RX board.
6. Adjust the value of the frequency counter to specification by
RV301 on the RX-BASE board.
Specified Values: 76kHz ± 50Hz.
3-2. Receive 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 connector only.
4. Keep distance transmitter and headphones to 5 meter over.
5. Set the headphones volume (RV302) to minimum.
6. Set the headphones tuning (RV303) to center position.
7.
Connect an oscilloscope CH1 and CH2 to IC301 pin 6 and pin 4.
8. Check thewaveformof theoscilloscope to CH1 isdemodulated
1kHz signal and CH2 is GND.
9. If CH1 and CH2 are not satisfied step 8, adjust the coil (L301)
on the RX board to satisfied step 8.
10. Set the transmitter CHANNEL switch to 1 or 3.
11. Adjust the headphones tuning (RV303) to receive radio
frequency.
12. Check same step 8.
3-3. 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 connector only.
4. Adjust the headphones tuning (RV303) to receive radio
freqency.
5. Set the headphones volume (RV302) to minimum.
6. Connect an oscilloscope CH1 and CH2 to IC301 pin 6 and pin 4.
7. Check the waveform ofthe oscilloscope to CH1is demodulated
1kHz signal and CH2 is GND.
8. Connect an AC volt meter to IC301 pin 6 and GND.
9. Check the value of theAC volt meter to 26mVrms ± 2mV
3-4. 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 connector only.
4. Adjust the headphones tuning (RV303) to receive radio
freqency.
5. Connect an oscilloscope to CH1 is demodulated 1kHz signal
and CH2 is GND.
6. Check thewaveformof theoscilloscope to CH1 isdemodulated
1kHz signal and CH2 is GND.
7. Connect anAC volt meter with LPF to speakers terminal (L+,L-).
8. Adjust the value of the AC volt meter to specification by
headphones volume RV302.
Specified Value: 155mVrms
9. Connect anAC volt meter with LPF to speakers terminal (R+,R-).
10. Measure the value of theAC volt meter.
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 connector only.
13. Connect an AC volt meter to speakers terminal (R+,R-).
14. Adjust the value of the AC volt meter to specification by
headphones volume RV302.
Specified Value: 155mVrms
15. Connect an AC volt meter to speakers terminal (L+,L-).
16. Measure the value of theAC volt meter.
17. Check the difference of the L and R to more than 20dB.
Adjustment Location : (See page 6)

— 6 —
Adjustment Location :
[RX-BASE BOARD]
(Conductor side)

MDR-RF815R
— 7 — — 8 —
4-1. BLOCK DIAGRAM
SECTION 4
DIAGRAMS
• IC BLOCK DIAGRAM
IC302 LA4533M
POWER
SWITCH
MUTE
CIRCIUT
BIAS
1
2
3
4
56
7
8
9
10 MT/SW
OUT1
POWER GND
OUT2
VCC
P/SW
IN1
PRE GND
IN2
REF
AMP2
AMP1
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF:µµF 50WV or
less are not indicated except for electrolytics and tantalums.
• All resistors are in Ωand 1/4W or less unless otherwise specified.
•f: internal component.
•A: B+ Line.
•H: adjustment for repair.
• Power voltage is dc 2.4 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 aVOM (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.
F:FM
L: AUDIO
Note on Printed Wiring Board:
•X: parts extracted from the component side.
•a:Through hole.
•b: Pattern from the side which enables seeing.
Caution:
Pattern face side: Partsonthepatternfacesideseen from
(SideB) the pattern face are indicated.
Parts face side: Parts on the parts face side seen from
(Side A) the parts face are indicated.
L301
RECEIVE
FREQ.
RV303
TUNING
D301
16
+V +V
FRONT END
FE UNIT 18 1316 FM IF/
DISCRI
DECODE
AMP
STEREO
IND
CF301
10.7MHz
26
CF302
10.7MHz
6 2 9
5R-CH
R-CH
RV302
VOLUME
SPEAKER
L-CH
SPEAKER
R-CH
POWER AMP
IC302
22
20
FM FE
L302
+V
27
AUTO
BLEND
MUTE MONO/ST
SW
1/2
COUNTER
PD1
PD1
VCO
21
REG
RV301
FREE RUN
FREQ.
IF AMP/DECODE
IC301
D304
S1
ON/OFF SW
+
-
B+
Ni-Cd
1.2 x 2
¥ Signal path.
F: FM
POWER

MDR-RF815R
— 9 — — 10 —
4-2. SCHEMATIC DIAGRAM
FREE RUN
FREQ.
5
2.2
0.01

MDR-RF815R
— 11 — — 12 —
4-3. PRINTEDWIRING BOARD
S1
ON/OFF
SWITCH
SPEAKER
(L-ch)
SPEAKER
(R-ch)
RECHARGEABLE
Ni-cd
NC-AA(HJ)
2pcs,2.4V
RV303
RV303
Ref. No. Location
D301 B-1
D304 B-2
D310 C-2
IC301 A-2
IC302 C-2
• Semiconductor
Location

— 13 — — 14 —
SECTION 5
EXPLODED VIEWS
NOTE:
• -XX, -X mean standardized parts, so they may
have some differences from the original one.
• Items marked “*” are not stocked since they
are seldom required for routine service. Some
delayshouldbeanticipatedwhenorderingthese
items.
• Themechanical parts with no reference number
in the exploded views are not supplied.
• Hardware (# mark) list and accessories and
packing materials are given in the last of this
parts list.
1
2
3
45
7
810
9
11
12
21 13 23
3
4
5
9
1415
6
#2
#2
#2
#1
#1
#1
#1
#1
#2
#2
#2
#2
16
19
17
8
20
23
a
a
b
b
Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks
1 3-046-672-01 SUSPENDER
2 3-046-671-11 BAND,HEAD (BLACK)
2 3-046-671-21 BAND,HEAD (WHITE)
3 3-046-692-01 PAT,EAR
4 1-542-400-11 DRIVER (030F032//K)
5 3-046-685-01 PLATE(L), FRONT
6 3-046-675-11 HANGER (R) (BLACK)
6 3-046-675-21 HANGER (R) (WHITE)
7 1-771-249-11 SWITCH, PUSH (1 KEY)
8 4-992-281-01 HOLDER, BALL SHAFT
9 3-046-673-01 SPRING, FREE ADJUSTMENT
*10 A-4542-641-A RX-BASE BOARD, COMPLETE
11 3-046-677-11 COVER (R), HANGER (BLACK)
11 3-046-677-21 COVER (R), HANGER (WHITE)
12 3-049-799-01 LIGHT, MDR GUIDE
13 3-046-679-11 CAP(R), ORNAMENTAL (BLACK)
13 3-046-679-21 CAP(R), ORNAMENTAL (WHITE)
14 3-046-674-01 HANGER (L) (WHITE)
14 3-046-674-11 HANGER (L) (BLACK)
15 3-048-267-01 TERMINAL (MIDWAY), BATTERY
16 3-048-265-01 TERMINAL (+), BATTERY
17 3-048-266-01 TERMINAL (-), BATTERY
19 3-046-676-11 COVER (L), HANGER (BLACK)
19 3-046-676-21 COVER (L), HANGER (WHITE)
20 3-046-678-11 CAP(L), ORNAMENTAL (BLACK)
20 3-046-678-21 CAP(L), ORNAMENTAL (WHITE)
21 3-046-682-01 TERMINAL, CHARGE
23 3-048-264-01 SHEET, ORNAMENTAL CAP ADHESIVE
#1 7-685-104-19 SCREW +P2X6 TYPE2 NON-SLIT
#2 7-685-105-19 SCREW +P2X8 TYPE2 NON-SLIT
Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks
SECTION 6
ELECTRICAL PARTS LIST
NOTE:
• Due to standardization, replacements in the
parts list may be different from the parts
specifiedinthediagramsorthecomponents
used on the set.
• -XX, -X mean standardized parts, so they
may have some difference from the original
one.
• Items marked “*” are not stocked since they
are seldom required for routine service.
Some delay should be anticipated when
ordering these items.
• CAPACITORS:
uF: µF
• RESISTORS
All resistors are in ohms.
METAL: metal-film resistor
METAL OXIDE: Metal Oxide-film resistor
F: nonflammable
• COILS
uH: µH
• SEMICONDUCTORS
In each case, u: µ, for example:
uA...: µA... , uPA... , µPA... ,
uPB... , µPB... , uPC... , µPC... ,
uPD..., µPD...
When indicating parts by reference number,
please include the board name.
*A-4542-641-A RX-BASE BOARD, COMPLETE
************************
*A-4542-642-A RX-FE UNIT (FRONT END)
< CAPACITOR >
C301 1-164-346-11 CERAMIC CHIP 1uF 16V
C302 1-164-005-11 CERAMIC CHIP 0.47uF 25V
C303 1-124-259-11 ELECT 4.7uF 20.00% 16V
C304 1-163-037-11 CERAMIC CHIP 0.022uF 10% 25V
C305 1-163-037-11 CERAMIC CHIP 0.022uF 10% 25V
C306 1-124-234-00 ELECT 22uF 20% 16V
C307 1-163-059-91 CERAMIC CHIP 0.01uF 10.00% 50V
C308 1-124-234-00 ELECT 22uF 20% 16V
C309 1-124-257-11 ELECT 2.2uF 20.00% 50V
C310 1-104-942-11 ELECT 1uF 20.00% 50V
C311 1-124-233-11 ELECT 10uF 20.00% 16V
C312 1-126-162-11 ELECT 3.3uF 20% 50V
C313 1-163-021-91 CERAMIC CHIP 0.01uF 10.00% 50V
C314 1-164-441-11 CERAMIC CHIP 68PF 5.00% 50V
C315 1-163-235-11 CERAMIC CHIP 22PF 5.00% 50V
C316 1-124-233-11 ELECT 10uF 20.00% 16V
C317 1-163-009-11 CERAMIC CHIP 0.001uF 10% 50V
C319 1-163-021-91 CERAMIC CHIP 0.01uF 10.00% 50V
C320 1-163-038-00 CERAMIC CHIP 0.1uF 25V
C324 1-124-635-00 ELECT 220uF 20.00% 6.3V
C325 1-124-635-00 ELECT 220uF 20.00% 6.3V
C326 1-124-635-00 ELECT 220uF 20.00% 6.3V
C327 1-163-038-00 CERAMIC CHIP 0.1uF 25V
C328 1-163-038-00 CERAMIC CHIP 0.1uF 25V
C329 1-163-021-91 CERAMIC CHIP 0.01uF 10.00% 50V
C330 1-124-242-00 ELECT 33uF 20% 25V
C331 1-163-021-11 CERAMIC CHIP 0.01uF 10% 50V
C332 1-163-245-11 CERAMIC CHIP 56PF 5.00% 50V
C333 1-163-222-11 CERAMIC CHIP 5PF 0.25PF 50V
C334 1-164-346-11 CERAMIC CHIP 1uF 16V
C336 1-163-245-11 CERAMIC CHIP 56PF 5.00% 50V
C345 1-163-021-11 CERAMIC CHIP 0.1uF 25V
C350 1-164-346-11 CERAMIC CHIP 1uF 16V
C351 1-164-346-11 CERAMIC CHIP 1uF 16V
C352 1-163-009-11 CERAMIC CHIP 0.001uF 10% 50V
C355 1-163-009-11 CERAMIC CHIP 0.001uF 10% 50V
C357 1-163-021-91 CERAMIC CHIP 0.01uF 10.00% 50V
C361 1-163-251-11 CERAMIC CHIP 100PF 5.00% 50V
C362 1-163-251-11 CERAMIC CHIP 100PF 5.00% 50V
C363 1-163-021-91 CERAMIC CHIP 0.01uF 10.00% 50V
C364 1-163-009-11 CERAMIC CHIP 0.001uF 10% 50V
C365 1-163-009-11 CERAMIC CHIP 0.001uF 10% 50V
C366 1-163-009-11 CERAMIC CHIP 0.001uF 10% 50V
< FILTER >
CF301 1-577-588-11 FILTER, CERAMIC 10.7MHz
CF302 1-577-572-11 FILTER, CERAMIC 10.7MHz
< DIODE >
D301 8-719-002-81 DIODE 1T363
D304 8-719-077-16 LED SLR-342VC3F (power)
D310 8-719-975-40 DIODE RB411D
< IC >
IC301 8-752-072-12 IC CXA1538N
IC302 8-759-802-75 IC LA4533M
< JUMPER >
JC301 1-216-295-91 SHORT 0
JC303 1-216-295-91 SHORT 0
JC305 1-216-295-91 SHORT 0
JC309 1-216-295-91 SHORT 0
JC311 1-216-295-91 SHORT 0
JC324 1-216-295-91 SHORT 0
< COIL >
L301 1-422-317-31 COIL, AIR-CORE
L302 1-412-933-11 INDUCTOR 0.33uH
L304 1-414-234-11 INDUCTOR CHIP 0uH
L305 1-414-234-11 INDUCTOR CHIP 0uH
L306 1-414-234-11 INDUCTOR CHIP 0uH
L307 1-414-234-11 INDUCTOR CHIP 0uH
L308 1-414-766-21 INDUCTOR CHIP 0uH
L309 1-414-766-21 INDUCTOR CHIP 0uH
RX-BASE
• Color Indication of Appearance Parts Example:
KNOB, BALANCE (WHITE) . . . (RED)
↑ ↑
Parts of Color Cabinet’s Color

Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks
— 15 —
< RESISTOR >
R302 1-216-057-00 METAL CHIP 2.2K 5% 1/10W
R304 1-216-061-00 METAL CHIP 3.3K 5% 1/10W
R305 1-216-061-00 METAL CHIP 3.3K 5% 1/10W
R308 1-216-057-00 METAL CHIP 2.2K 5% 1/10W
R309 1-216-097-91 RES-CHIP 100K 5% 1/10W
R310 1-216-061-00 METAL CHIP 3.3K 5% 1/10W
R312 1-216-077-00 RES-CHIP 15K 5% 1/10W
R314 1-216-097-91 RES-CHIP 100K 5% 1/10W
R315 1-216-001-00 METAL CHIP 10 5% 1/10W
R316 1-216-001-00 METAL CHIP 10 5% 1/10W
R320 1-216-001-00 METAL CHIP 10 5% 1/10W
R321 1-216-053-00 METAL CHIP 1.5K 5% 1/10W
R322 1-216-069-00 METAL CHIP 6.8K 5% 1/10W
R323 1-216-069-00 METAL CHIP 6.8K 5% 1/10W
R325 1-216-037-00 METAL CHIP 330 5% 1/10W
RX-BASE
R327 1-216-085-00 METAL CHIP 33K 5% 1/10W
R328 1-216-085-00 METAL CHIP 33K 5% 1/10W
R330 1-216-001-00 METAL CHIP 10 5% 1/10W
R333 1-216-057-00 METAL CHIP 2.2K 5% 1/10W
R334 1-216-057-00 METAL CHIP 2.2K 5% 1/10W
< VARIABLE RESISTOR >
RV301 1-241-763-11 RES, ADJ, CARBON 4.7K
RV302 1-227-189-11 RES, VAR CARBON 20K/20K (VOLUME)
RV303 1-227-190-11 RES, VAR CARBON 10K (TUNING)
**************************************************************
MISCELLANEOUS
**************
4 1-542-400-11 DRAIVER (030F032//K)
7 1-771-249-11 SWITCH, PUSH (1 KEY)
**************************************************************

MDR-RF815R
— 16 —
Sony Corporation
Audio Entertainment Group 2000F1646-1
Printed in Japan © 2000.6
Published by PE General Engineering Dept.
9-927-956-11

TMR-RF815R
AEP Model
UK Model
SERVICE MANUAL
TRANSMITTER
SPECIFICATIONS
Headphones MDR-RF815R
Transmitter TMR-RF815R
TMR-RF815R is the component model block one in the MDR-RF815RK.
COMPONENT MODEL NAME FOR MDR-RF815RK
General
Carrier frequency
863.5 – 864.5 MHz
Channel Ch1, Ch2, Ch3
Modulation FM stereo
Frequency response
20 – 20,000 Hz
Transmitter
Power source DC 9 V: supplied AC power
adaptor
Audio input phono jacks/stereo mini jack
Dimensions Approx. 150 mm dia ×108 mm
(6 ×4 1/3in.) (w/h)
Mass Approx. 190 g (6.2 oz.)
Design and specifications are subject to change without
notice.
Ver 1.0 2000. 06

— 2 —
SECTION 1
GENERAL
DC IN 9V
OFF ON
FILTERNOISE
123
CHANNEL
RBAL
AUDIO IN
Setting up the
transmitter
1 Connect the transmitter to audio/video
equipment. Select one of the hookups
below depending on the jack type:
ATo connect to a headphones jack
Transmitter
Left channel
(white)
Right channel
(red)
Unimatch plug
adaptor
(supplied)
CD Walkman,
MD Walkman,
WALKMAN*,
VCR, etc.
to headphones
jack (stereo
mini jack)
Connecting cord
(supplied)
to AUDIO IN
A jacks
to headphones
jack (stereo
phone jack)
This section is extracted
from instruction manual.
1. Check the area of your repair for unsoldered or poorly-
soldered connections. Check the entire board surface
for solder splashes and bridges.
2. Check the interboard wiring to ensure that no wires are
"pinched" or contact high-wattage resistors.
3. Look for unauthorized replacement parts, particularly
transistors, that were installed during a previous repair.
Point them out to the customer and recommend their
replacement.
4. Look for parts which, through functioning, show obvious
signs of deterioration. Point them out to the customer
and recommend their replacement.
5. Check the B+ voltage to see it is at the values specified.
6. Flexible Circuit Board Repairing
• Keep the temperature of the 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
SAFETY CHECK-OUT
After correcting the original service problem, perform the following
safety checks before releasing the set to the customer.

— 3 —
SECTION 2
DISASSEMBLY
2-1. CABINET (UPPER)
2-2. TX-BASE BOARD
1 Four screws (P 2 × 8)
Cabinet (upper)
2
2 TX-BASE board
Cabinet assy, lowe
r
1
Note : Follow the disassembly procedure in the numerical order given.

— 4 —
Setting :
SECTION 3
ELECTRICAL ADJUSTMENTS
Send Frequency Check
1. 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. PlaceTX-BASE board close to thefrequencycounter, then mea-
sure 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
Whenthe frequencyis not satisfied thespecifiedvalue,exchange
vco unit. When completed with replacement, recheck the
frequecies of CH1, CH2 and CH3.
[TK-BASE BOARD] (Component side)
AF signal
generator
Telescopic
antenna
8 cm
L-CH (J402)
TMR-RF815R
set
TMR-RF815R
set
Frequency counter
Pilot signal Modulation Check and Adjustment
1. Set the channel to CH2.
2. No signal input (The operating time in this case is limited to 4
or 5 minutes.)
3. Measure the movable terminal of RV403 using an digital volt-
meter(ACrange)andmake surethe valueis1.6mVrms ±0.1mV.
If the measured value is other than the specified value,adjust to
1.6mVrms ± 0.1mV by turning the RV403 on the TX-BASE
board.
Connection points andAdjustment Location :
S402 J402
(L-CH) (R-CH)
CH3
← CH2 ← CH1
VCO UNIT
RV403

TMR-RF815R
4-1. BLOCK DIAGRAM
— 5 — — 6 —
SECTION 4
DIAGRAMS
J401
S401
NOISE FILTER
NOISE
FILTER
INPUT
AMP
CH1
AMP BUFFER
BUFFER
Q401
RECT
D404,405
2V
D408
INPUT
DET
DIVIDER
BUFFER
OSC
AMP
TIME
DEVISION
MPX
AUDIO IN
B
J402
A
OFF
|
ON
S402
CHANNEL
L
R R-CH
R-CH
R-CH
1 9
8
13
10
1211
679
15
76
CH2
AMP
14
X401
38kHz
RV403
MOD IN
CE DI CL
CE DI CL
VS
16
5V
VCO CONTROLLER
IC404
IC401
LPF
IC403
STEREO MPX
IC405(1/2)
IC405(2/2)
+5V
REG
SWITCH
Q404
+4V
Q402
POWER OFF
DET
IC402
ANT
5V
B+
T-OUT
ANT401
D401
D402
J404
DC IN 9V
CHARGE
POWER
CHG
1
2
3
VCO UNIT
• Signal path.
: AUDIO
16
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 50WV or
less are not indicated except for electrolytics and tantalums.
• All resistors are in Ωand 1/4W or less unless otherwise specified.
•f: 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 aVOM (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

TMR-RF815R
4-2. SCHEMATIC DIAGRAM
— 7 — — 8 —
220
330p 100k

TMR-RF815R
4-3. PRINTEDWIRING BOARD
— 9 — — 10 —
Ref. No. Location
D401 D-3
D402 D-3
D403 A-4
D404 D-2
D405 D-2
D407 B-3
D408 D-4
D410 B-4
IC401 B-2
IC402 B-4
IC403 D-4
IC404 B-3
IC405 D-2
Q401 D-1
Q402 B-4
Q404 B-4
• Semiconductor
Location
1

— 11 — — 12 —
SECTION 5
EXPLODED VIEWS
NOTE:
• -XX, -X mean standardized parts, so they may
have some differences from the original one.
• Items marked “*” are not stocked since they
are seldom required for routine service. Some
delayshouldbeanticipatedwhenorderingthese
items.
• Themechanical parts with no reference number
in the exploded views are not supplied.
• Accessories and packing materials are given in
the last of this parts list.
Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks
1 3-046-687-11 CABINET (UPPER) (BLACK)
1 3-046-687-21 CABINET (UPPER) (WHITE)
2 3-049-800-01 CUSHION, ANTENNA
3 3-046-690-01 TUBE, LIGHT GUIDE
*4 A-4542-645-A TX-BASE BOARD, COMPLETE
Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks
SECTION 6
ELECTRICAL PARTS LIST
NOTE:
• Due to standardization, replacements in the
parts list may be different from the parts
specifiedinthediagramsorthecomponents
used on the set.
• -XX, -X mean standardized parts, so they
may have some difference from the original
one.
• Items marked “*” are not stocked since they
are seldom required for routine service.
Some delay should be anticipated when
ordering these items.
• CAPACITORS:
uF: µF
• RESISTORS
All resistors are in ohms.
METAL: metal-film resistor
METAL OXIDE: Metal Oxide-film resistor
F: nonflammable
• COILS
uH: µH
• SEMICONDUCTORS
In each case, u: µ, for example:
uA...: µA... , uPA... , µPA... ,
uPB... , µPB... , uPC... , µPC... ,
uPD..., µPD...
When indicating parts by reference number,
please include the board name.
*A-4542-645-A TX-BASE BOARD, COMPLETE
***********************
*A-4542-646-A TX-VCO UNIT (VCO)
< ANTENNA >
ANT401 4-213-164-01 TERMINAL, ANTENNA
< CAPACITOR >
C403 1-163-009-11 CERAMIC CHIP 0.001uF 10% 50V
C406 1-163-037-11 CERAMIC CHIP 0.022uF 10% 25V
C407 1-126-961-11 ELECT 2.2uF 20.00% 50V
C413 1-163-009-11 CERAMIC CHIP 0.001uF 10% 50V
C416 1-163-037-11 CERAMIC CHIP 0.022uF 10% 25V
C417 1-126-961-11 ELECT 2.2uF 20.00% 50V
C421 1-124-234-00 ELECT 22uF 20% 16V
C422 1-126-934-11 ELECT 220uF 20.00% 16V
C423 1-163-251-11 CERAMIC CHIP 100PF 5.00% 50V
C425 1-163-037-11 CERAMIC CHIP 0.022uF 10% 25V
C426 1-163-021-91 CERAMIC CHIP 0.01uF 10.00% 50V
C427 1-163-021-91 CERAMIC CHIP 0.01uF 10.00% 50V
C428 1-163-251-11 CERAMIC CHIP 100PF 5.00% 50V
C429 1-163-251-11 CERAMIC CHIP 100PF 5.00% 50V
C430 1-124-259-11 ELECT 4.7uF 20.00% 16V
C431 1-126-157-11 ELECT 10uF 20% 16V
C432 1-163-018-00 CERAMIC CHIP 0.0056uF 5% 50V
C433 1-164-346-11 CERAMIC CHIP 1uF 16V
C435 1-163-038-00 CERAMIC CHIP 0.1uF 25V
C436 1-126-157-11 ELECT 10uF 20% 16V
C438 1-163-251-11 CERAMIC CHIP 100PF 5.00% 50V
C441 1-126-157-11 ELECT 10uF 20% 16V
C442 1-163-018-00 CERAMIC CHIP 0.0056uF 5% 50V
C443 1-164-346-11 CERAMIC CHIP 1uF 16V
C444 1-163-251-11 CERAMIC CHIP 100PF 5.00% 50V
C445 1-163-251-11 CERAMIC CHIP 100PF 5.00% 50V
C451 1-124-635-00 ELECT 220uF 20.00% 6.3V
C452 1-163-038-00 CERAMIC CHIP 0.1uF 25V
C453 1-126-157-11 ELECT 10uF 20% 16V
C454 1-163-251-11 CERAMIC CHIP 100PF 5.00% 50V
C455 1-163-227-11 CERAMIC CHIP 10PF 0.50PF 50V
C457 1-163-003-11 CERAMIC CHIP 330P 50V
C458 1-126-157-11 ELECT 10uF 20% 16V
C462 1-163-251-11 CERAMIC CHIP 100PF 5.00% 50V
C465 1-163-009-11 CERAMIC CHIP 0.001uF 10% 50V
C466 1-163-021-91 CERAMIC CHIP 0.01uF 10.00% 50V
C468 1-163-038-00 CERAMIC CHIP 0.1uF 25V
C470 1-126-382-11 ELECT 100uF 20.00% 16V
C472 1-163-243-11 CERAMIC CHIP 47PF 5.00% 50V
C474 1-164-346-11 CERAMIC CHIP 1uF 16V
C475 1-124-635-00 ELECT 220uF 20.00% 6.3V
C476 1-126-382-11 ELECT 100uF 20.00% 16V
C478 1-163-038-00 CERAMIC CHIP 0.1uF 25V
C480 1-163-021-91 CERAMIC CHIP 0.01uF 10.00% 50V
C481 1-163-251-11 CERAMIC CHIP 100PF 5.00% 50V
C483 1-163-224-11 CERAMIC CHIP 7PF 0.25PF 50V
C488 1-163-021-91 CERAMIC CHIP 0.01uF 10.00% 50V
< DIODE >
D401 8-719-059-98 LED SLR-342VC3F (power)
D402 8-719-048-87 LED SLR-332MGF03 (chg)
D403 8-719-200-82 DIODE 11ES2
D404 8-719-991-33 DIODE 1SS133T-77
D405 8-719-991-33 DIODE 1SS133T-77
D407 8-719-991-33 DIODE 1SS133T-77
D408 8-719-109-54 DIODE RD2.2ES-B2
D410 8-719-982-11 DIODE MTZJ-4.3B
< IC >
IC401 8-759-998-71 IC BA3308F
IC402 8-759-537-90 IC KIA78S05P-TP
IC403 8-759-667-59 IC NJM2035M(TE2)
IC404 8-759-679-76 IC KMP47C101M-1B54
IC405 8-759-510-73 IC BA10393F-E2
< JACK >
J401 1-566-822-21 JACK (B)
J402 1-580-441-61 JACK, PIN 2P (A)
J404 1-785-066-11 JACK,DC(POLARITY UNIFIED TYPE)(DC IN 9V)
< JUMPER >
JC418 1-216-295-91 SHORT 0
JC419 1-216-295-91 SHORT 0
JC421 1-216-295-91 SHORT 0
JC422 1-216-296-91 SHORT 0
JC423 1-216-296-91 SHORT 0
JC424 1-216-296-91 SHORT 0
JC426 1-216-296-91 SHORT 0
JC427 1-216-295-91 SHORT 0
JC430 1-216-295-91 SHORT 0
JC431 1-216-295-91 SHORT 0
JC470 1-216-295-91 SHORT 0
< COIL >
L401 1-414-234-11 INDUCTOR CHIP 0uH
L402 1-414-234-11 INDUCTOR CHIP 0uH
L404 1-414-234-11 INDUCTOR CHIP 0uH
L405 1-414-234-11 INDUCTOR CHIP 0uH
L408 1-419-079-21 COIL (MPX FILTER)
1
2
8
3
4
5
7
#2
#2
#2
5 X-3379-433-1 CABINET ASSY, LOWER (WHITE)
5 X-3379-660-1 CABINET ASSY, LOWER (BLACK)
7 4-984-729-01 FOOT, RUBBER
8 3-046-689-01 TERMINAL, CHARGE
#2 7-685-105-19 SCREW +P2X8 TYPE2 NON-SLIT
TX-BASE
• Color Indication of Appearance Parts Example:
KNOB, BALANCE (WHITE) . . . (RED)
↑ ↑
Parts of Color Cabinet’s Color