Sony MDR-RF830 User manual

MDR-RF830
UK Model SERVICE MANUAL
WIRELESS STEREO HEADPHONES
MICROFILM
SPECIFICATIONS
MDR-RF830 is the component model block one in the MDR-RF830RK.
COMPONENT MODEL NAME FOR MDR-RF830RK
Power source DC 3 V: 2 ×R6 (size AA) battery
or 2 ×supplied
NC-AA-HJ Ni-Cd
rechargeable battery
Mass Approx. 215 g (7.6 oz.) incl.
Ni-Cd batteries
Design and specifications are subject to change
without notice.
Wireless Stereo Headphones MDR-RF830
Transmitter TMR-RF830R
Ver 1.0 1998.07

— 2 —
Note: Follow the disassembly procedure in the numerical order given.
SECTION 1
DISASSEMBLY
— 2 —
1-1. RX BOARD, FE BOARD (R-CH)
3 Cover (R), hanger
7 FE board
4 RX board
8 Remove solder
9 Screw
(M1.7
× 4)
1 Screws (+P2 × 12)
2 Screws (+P2 × 8)
0 Spacer
!¡ SW1
6 Remove
solder
5 Plate, RX shield
1-2. MDD02 (R-CH)
5 Screw (M1.7 × 4)
2 Screw (+P2 × 8)
4 Housing (R) assy
6 MDD02 (R-CH)
1 Pad, ear
7 Remove solder
3 Holder, ball shaft

— 3 —
1-3. CASE, BATTERY, MDD01 (L-CH)

5 Screws (+P2 × 12)
3 Screws (+P2 × 8)
8 Screw (+P2 × 8)
!¡ Screw (M1.7 × 4)
0 Housing (L) assy
1 Pad, ear
!™ MDD01 (L-CH)
!£ Remove solder
9 Holder, ball shaft
7 Remove solder
4 Cover (L), hanger
6 Case, battery
2 Cover, battery

— 4 —
Notes:
1. Use transmitter with check and adjustment alreadycompleted.
2. The transmitter section adjustments should be completed before
performing the headphones section adjustment.
3. On adjusting the headphones section, use the transmitter as a jig.
Procedure:
1. Feed a signal to jig (transmitter) and connect a power supply to
DC IN 9V jack (J404).
Receive frequency check and adjustment
1. Set the transmitter channel to CH2.
2. Set the transmitter noise filter SW to OFF .
3. Input a signal of 1kHz 316mVrms to onl y the transmitter L-
CH (J403).
4. Place transmitter and headphones at a distance of more than 5m
apart.
5. Set the VOL (RV301) to MIN.
6. Position RX board TUNINGVOL (RV302) to the center .
7. Connect a digital voltmeter (DC range) and an oscilloscope
between
IC301 pin @¡ and GND.
8. First check to make sure that a demodulated waveform of 1kHz
(appr oximately 13mVrms) is outputted to the oscilloscope ,
then
check to make sure the DC voltmeter reading is DC 1 to 1.2V .
9. If a demodulated waveform of 1kHz is not outputted to the
oscilloscope or if the DC level is not within the range specified
above, adjust the RX board L301 so that a demodulated
waveform of 1kHz is outputted to the oscilloscope and while
the wave-form is outputted, further fine adjust the L301 so that
the DC voltmeter reading is DC1.1V.
10. When completed, make sure signals can be received when
switching the transmitter channel to CH1 or CH3 by turning
RX board TUNING VOL (RV302).
Connection points andAdjustment Location:
RX BOARD (See page 5)
Separation check and adjustment
1. Set the transmitter channel to CH2.
2. Set the transmitter noise filter SW to OFF .
3. Input a signal of 1kHz 316mVrms to onl y the transmitter L-
CH (J403).
4. Connect an digital voltmeter (AC range) and oscilloscope to
the L-CH speaker outputs (both sides of MDD01).
5. Receive signals by turning the TUNING VOL (RV302).
6. Adjust the VOL (RV301) so that the RX board L-CH speaker
outputs (both sides of MDD01) are 155mVrms.
7. Connect an digital voltmeter (AC range) and oscilloscope to
the R-CH speaker outputs (both sides of MDD02) and measure
the voltages.
8. At this time, check to make sure the level separation of L-CH
and R-CH speaker outputs is more than 20dB. If the separation
is less than 20dB, turn RV303 on the RX boar d so that the R-
CH output is minimal, then check to see if the level separation
of L-CH and R-CH speaker outputs is more than 20dB.
9. Input a signal of 1kHz 316mVrms to only the transmitter R-CH
(J402).
10. Adjust the VOL (RV301) so that the RX boar d R-CH speaker
outputs (both sides of MDD02) are 155mVrms.
11. Connect an digital voltmeter (AC range) and oscilloscope to
the L-CH speaker outputs (both sides of MDD01) and measure
the voltages.
12. At this time, check to make sure the level separation of L-CH
and R-CH speaker outputs is more than 20dB.
Connection points andAdjustment Location:
RX BOARD (See page 5)
SECTION 2
ELECTRICAL ADJUSTMENTS
Headphones
MDR-RF830 Transmitter TMR-RF830R
Transmitter
J404
power supply
(DC 9V)
L-CH (J403)
1kHz 316mVrms (–7.8dB)
AF OSC
ATT Jig
600
Ω

— 5 —
Connection points :
Adjustment Location :
[ RX BOARD ] (Conductor side)
Oscilloscope
Digital voltmeter
(AC range)
Oscilloscope
Digital voltmeter
(DC range)
RV302
Tuning Knob
RV301
VOL Knob
L301 : Receive Frequency Adjustment
RV303 : Separation Adjustmen t
[RX BOARD](Component side)

— 6 —
SECTION 3
DIAGRAMS
24 23 22 21 20 19 18 17 16 15 14 13
1 2 3 4 5 6 7 8 9 10 11 12
REGULATOR
AM•FE
FM•FE
RIPPLE
FILTER
TUNING
METER
DETUNE
DET
FM•IF
DISCRI
AM•IF
DET•AGC
DETUNE DET CONTROL VCC RIPPLE FILTER DET OUT AFC AGC AFC AGC AM IF OUT GND METER FM IF IN AM IF IN FM/AM BAND SELECT
DETUNE DET
GND
FM DISCRI
AM OSC
AFC
FM OSC
REG OUT
FM RF
AM RF IN
NC
FM RF IN
GND
FM/AM
FE OUT
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
•IC BLOCK DIAGRAMS
IC302 LA4533M
IC301 CXA1611N-T4

MDR-RF830
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.
•¢: internal component.
•U: B+ Line.
•H: adjustment for repair.
• Power voltage is dc 3 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— 9 — — 10 —
r
WAVEFORM
1
IC301 @¡
VOLT/DIV : 2m V AC
TIME/DIV : 20 µsec
10mVp-p
20.4
µ sec
3.2 SCHEMATIC DIAGRAM • Refer tp page 6 IC Block Diagrams.

— 11 —
SECTION 4
EXPLODED VIEW
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
delayshould be anticipatedwhen orderingthese
items.
• Themechanical parts withno 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.
Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks
1 4-994-129-01 PAD, EAR
2 X-4950-086-1 HOUSING (R) ASSY
3 4-994-119-01 HANGER (R)
4 4-992-281-01 HOLDER, BALL SHAFT
5 4-210-280-01 PLATE, RX SHIELD
*6 A-4542-535-A RX BOARD, COMPLETE
7 4-994-121-11 COVER (R), HANGER
8 3-713-791-01 SCREW (M1.7X4), TAPPING, P2
9 4-995-597-01 SPACER
10 4-994-124-11 SUSPENDER
11 4-994-118-01 BAND, HEAD
12 4-994-123-11 COVER, BATTERY
13 X-4950-087-1 HOUSING (L) ASSY
14 4-995-475-01 SPRING, TENSION
15 4-994-130-01 TERMINAL (+), BATTERY
16 4-994-132-01 TERMINAL (MIDWAY), BATTERY
17 4-993-020-01 CASE, BATTERY
18 4-994-131-01 TERMINAL (-), BATTERY
19 4-994-122-01 COVER (L), HANGER
20 4-994-120-01 HANGER (L)
21 3-831-441-99 CUSHION, SPEAKER
*22 A-4542-536-A FE BOARD, COMPLETE
MDD01 1-505-117-21 RECEIVER (L-CH)
MDD02 1-505-117-21 RECEIVER (R-CH)
SW1 1-771-249-11 SWITCH, PUSH (1 KEY)(POWER)
4-1. EXPLODED VIEW
11
12
21
15 16
14
17
18
4
20
8
13
19
8
1
8
2
4
5
3
6
9
8
14
22
7
1
8
10
MDD01
#3
#2
MDD02
#2
#2
#2
SW1
#3
(Included
in Ref. No. 6)
(Including
Ref. No. 22)

— 12 —
SECTION 5
ELECTRICAL PARTS LIST
NOTE:
• Due to standardization, replacements in the
parts list may be different from the parts
specifiedinthe diagramsor the components
used on the set.
• -XX, -X mean standardized parts, so they
may have some difference from the original
one.
• RESISTORS
All resistors are in ohms.
METAL: metal-film resistor
METAL OXIDE: Metal Oxide-film resistor
F: nonflammable
When indicating parts by reference number,
please include the board name.
• Itemsmarked“*” arenot stocked sincethey
are seldom required for routine service.
Some delay should be anticipated when
ordering these items.
• SEMICONDUCTORS
In each case, u: µ, for example:
uA...: µA... , uPA... , µPA... ,
uPB... , µPB... , uPC... , µPC... ,
uPD..., µPD...
• CAPACITORS:
uF: µF
• COILS
uH: µH
Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks
*A-4542-536-A FE BOARD, COMPLETE
******************
************************************************************
*A-4542-535-A RX BOARD, COMPLETE
******************
< CAPACITOR >
C301 1-124-589-11 ELECT 47uF 20% 16V
C302 1-164-489-11 CERAMIC CHIP 0.22uF 10% 16V
C303 1-162-921-11 CERAMIC CHIP 33PF 5% 50V
C306 1-164-227-11 CERAMIC CHIP 0.022uF 10% 25V
C307 1-162-927-11 CERAMIC CHIP 100PF 5% 50V
C309 1-126-572-11 ELECT 4.7uF 20% 35V
C310 1-110-563-11 CERAMIC CHIP 0.068uF 10% 16V
C311 1-162-923-11 CERAMIC CHIP 47PF 5% 50V
C312 1-162-970-11 CERAMIC CHIP 0.01uF 10% 25V
C313 1-162-926-11 CERAMIC CHIP 82PF 5% 50V
C314 1-162-957-11 CERAMIC CHIP 220PF 5% 50V
C315 1-124-233-11 ELECT 10uF 20% 16V
C316 1-164-245-11 CERAMIC CHIP 0.015uF 10% 25V
C317 1-162-970-11 CERAMIC CHIP 0.01uF 10% 25V
C318 1-164-346-11 CERAMIC CHIP 1uF 16V
C319 1-164-505-11 CERAMIC CHIP 2.2uF 16V
C320 1-164-346-11 CERAMIC CHIP 1uF 16V
C321 1-164-346-11 CERAMIC CHIP 1uF 16V
C322 1-124-242-00 ELECT 33uF 20% 25V
C324 1-107-725-11 CERAMIC CHIP 0.1uF 10% 16V
C325 1-107-725-11 CERAMIC CHIP 0.1uF 10% 16V
C326 1-124-635-00 ELECT 220uF 20% 6.3V
C327 1-124-635-00 ELECT 220uF 20% 6.3V
C328 1-124-635-00 ELECT 220uF 20% 6.3V
C329 1-164-346-11 CERAMIC CHIP 1uF 16V
C330 1-162-964-11 CERAMIC CHIP 0.001uF 10% 50V
C331 1-162-912-11 CERAMIC CHIP 7PF 0.5PF 50V
C332 1-164-441-11 CERAMIC CHIP 68PF 5% 50V
C333 1-163-021-91 CERAMIC CHIP 0.01uF 10% 50V
C334 1-124-233-11 ELECT 10uF 20% 16V
C335 1-162-924-11 CERAMIC CHIP 56PF 5% 50V
C336 1-162-924-11 CERAMIC CHIP 56PF 5% 50V
C337 1-162-970-11 CERAMIC CHIP 0.01uF 10% 25V
C338 1-163-037-11 CERAMIC CHIP 0.022uF 10% 25V
C339 1-164-489-11 CERAMIC CHIP 0.22uF 10% 16V
C340 1-164-346-11 CERAMIC CHIP 1uF 16V
C341 1-162-966-11 CERAMIC CHIP 0.0022uF 10% 50V
C342 1-162-923-11 CERAMIC CHIP 47PF 5% 50V
C350 1-163-021-91 CERAMIC CHIP 0.01uF 10% 50V
C352 1-162-198-31 CERAMIC 8.2PF 10% 50V
C355 1-162-919-11 CERAMIC CHIP 22PF 0.5PF 50V
< FILTER >
CF301 1-577-588-11 FILTER, CERAMIC
CF302 1-567-163-11 FILTER, CERAMIC
< DIODE >
D301 8-719-045-99 DIODE RD2.2M-T1B
D302 8-719-002-81 DIODE 1T363
D303 8-719-066-57 LED SA2512 (POWER)
< FERRITE BEAD >
FB301 1-414-234-11 INDUCTOR CHIP 0UH
FB302 1-414-234-11 INDUCTOR CHIP 0UH
FB303 1-414-234-11 INDUCTOR CHIP 0UH
FB304 1-414-234-11 INDUCTOR CHIP 0UH
FB305 1-414-234-11 INDUCTOR CHIP 0UH
FB306 1-414-234-11 INDUCTOR CHIP 0UH
< IC >
IC301 8-752-066-93 IC CXA1611N-T4
IC302 8-759-802-75 IC LA4533M
IC303 8-759-195-02 IC TC7S86F-TE85L
IC304 8-759-096-87 IC TC7WU04FU(TE12R)
< JUMPER RESISTOR >
JC301 1-216-296-91 SHORT 0
JC302 1-216-296-91 SHORT 0
JC303 1-216-296-91 SHORT 0
JC304 1-216-296-91 SHORT 0
JC305 1-216-296-91 SHORT 0
JC308 1-216-864-11 METAL CHIP 0 5% 1/16W
JC309 1-216-295-91 SHORT 0
JC310 1-216-864-11 METAL CHIP 0 5% 1/16W
JC312 1-216-295-91 SHORT 0
JC313 1-216-864-11 METAL CHIP 0 5% 1/16W
JC314 1-216-864-11 METAL CHIP 0 5% 1/16W
JC315 1-216-864-11 METAL CHIP 0 5% 1/16W
JC316 1-216-295-91 SHORT 0
JC317 1-216-295-91 SHORT 0
< COIL >
L301 1-422-317-31 COIL, AIR-CORE
L302 1-412-933-11 INDUCTOR 0.33uH
L303 1-414-140-11 INDUCTOR 0.68uH
RXFE

— 13 —
< TRANSISTOR >
Q301 8-729-230-49 TRANSISTOR 2SC2712-YG
Q302 8-729-230-49 TRANSISTOR 2SC2712-YG
Q303 8-729-230-49 TRANSISTOR 2SC2712-YG
Q304 8-729-230-49 TRANSISTOR 2SC2712-YG
Q305 8-729-230-49 TRANSISTOR 2SC2712-YG
Q306 8-729-920-31 TRANSISTOR DTC343TK
Q307 8-729-230-49 TRANSISTOR 2SC2712-YG
Q308 8-729-040-78 TRANSISTOR DTA124GKA-T146
Q309 8-729-027-36 TRANSISTOR DTA143XKA-T146
< RESISTOR >
R301 1-216-857-11 METAL CHIP 1M 5% 1/16W
R302 1-216-101-00 METAL CHIP 150K 5% 1/10W
R303 1-216-081-00 METAL CHIP 22K 5% 1/10W
R304 1-216-061-00 METAL CHIP 3.3K 5% 1/10W
R305 1-216-101-00 METAL CHIP 150K 5% 1/10W
R306 1-216-853-11 METAL CHIP 470K 5% 1/16W
R307 1-216-845-11 METAL CHIP 100K 5% 1/16W
R308 1-216-089-91 RES,CHIP 47K 5% 1/10W
R309 1-216-841-11 METAL CHIP 47K 5% 1/16W
R310 1-216-817-11 METAL CHIP 470 5% 1/16W
R311 1-216-821-11 METAL CHIP 1K 5% 1/16W
R312 1-216-853-11 METAL CHIP 470K 5% 1/16W
R313 1-216-827-11 METAL CHIP 3.3K 5% 1/16W
R314 1-216-822-11 METAL CHIP 1.2K 5% 1/16W
R315 1-216-830-11 METAL CHIP 5.6K 5% 1/16W
R316 1-216-827-11 METAL CHIP 3.3K 5% 1/16W
R317 1-216-061-00 METAL CHIP 3.3K 5% 1/10W
R318 1-216-831-11 METAL CHIP 6.8K 5% 1/10W
R319 1-216-061-00 METAL CHIP 3.3K 5% 1/10W
R320 1-216-845-11 METAL CHIP 100K 5% 1/16W
R321 1-216-843-11 METAL CHIP 68K 5% 1/16W
R322 1-216-843-11 METAL CHIP 68K 5% 1/16W
R323 1-216-859-11 RES,CHIP 1.5M 5% 1/16W
R324 1-216-033-00 METAL CHIP 22 5% 1/10W
R325 1-216-825-11 METAL CHIP 2.2K 5% 1/16W
R326 1-216-827-11 METAL CHIP 3.3K 5% 1/16W
R327 1-216-809-11 METAL CHIP 100 5% 1/16W
R328 1-216-835-11 METAL CHIP 15K 5% 1/16W
R329 1-216-001-00 METAL CHIP 10 5% 1/10W
R330 1-216-001-00 METAL CHIP 0 5% 1/10W
R331 1-216-097-91 RES,CHIP 100K 5% 1/10W
R334 1-216-845-11 METAL CHIP 100K 5% 1/16W
R335 1-216-029-00 METAL CHIP 150 5% 1/10W
R342 1-216-831-11 METAL CHIP 6.8K 5% 1/16W
R345 1-216-841-11 METAL CHIP 47K 5% 1/16W
R348 1-216-831-11 METAL CHIP 6.8K 5% 1/16W
R349 1-216-001-00 METAL CHIP 10 5% 1/10W
R350 1-216-823-11 METAL CHIP 1.5K 5% 1/16W
R360 1-216-837-91 METAL CHIP 22K 5% 1/16W
< VARIABLE RESISTOR >
RV301 1-223-968-11 RES, VAR, CARBON 20K/20K (VOL)
RV302 1-225-641-11 RES, VAR, CARBON 10K (TUNING)
RV303 1-238-601-11 RES, ADJ, CARBON 22K (SEPARATION)
************************************************************
Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks
MISCELLANEOUS
*************
MDD01 1-505-117-21 RECEIVER (L-CH)
MDD02 1-505-117-21 RECEIVER (R-CH)
SW1 1-771-249-11 SWITCH, PUSH (1 KEY)(POWER)
************************************************************
*************
HARDWARE LIST
*************
#1 7-685-106-19 SCREW +P2X10 TYPE2 NON-SLIT
#2 7-685-105-19 SCREW +P2X8 TYPE2 NON-SLIT
#3 7-685-107-19 SCREW +P2X12 TYPE2 NON-SLIT

— 14 —
MDR-RF830
Sony Corporation
Personal A&V Products Company
98F1611-1
Printed in Japan ©1998.6
Published by Quality Engineering Dept.
(Shibaura)
9-924-939-11

MDR-RF830
AEP Model
UK Model
SERVICE MANUAL
WIRELESS STEREO HEADPHONES
MICROFILM
SPECIFICATIONS
MDR-RF830 is the component model block one in the MDR-RF830RK.
COMPONENT MODEL NAME FOR MDR-RF830RK
Power source DC 3 V: 2 ×R6 (size AA) battery
or 2 ×supplied
NC-AA-HJ Ni-Cd
rechargeable battery
Mass Approx. 215 g (7.6 oz.) incl.
Ni-Cd batteries
Design and specifications are subject to change
without notice.
Wireless Stereo Headphones MDR-RF830
Transmitter TMR-RF830R
REVISED
Ver 1.2 1999. 09

— 2 —
Note: Follow the disassembly procedure in the numerical order given.
SECTION 1
DISASSEMBLY
— 2 —
1-1. RX BOARD, FE BOARD (R-CH)
3 Cover (R), hanger
7 FE board
4 RX board
8 Remove solder
9 Screw
(M1.7
× 4)
1 Screws (+P2 × 12)
2 Screws (+P2 × 8)
0 Spacer
!¡ SW1
6 Remove
solder
5 Plate, RX shield
1-2. MDD02 (R-CH)
5 Screw (M1.7 × 4)
2 Screw (+P2 × 8)
4 Housing (R) assy
6 MDD02 (R-CH)
1 Pad, ear
7 Remove solder
3 Holder, ball shaft

— 3 —
1-3. CASE, BATTERY, MDD01 (L-CH)

5 Screws (+P2 × 12)
3 Screws (+P2 × 8)
8 Screw (+P2 × 8)
!¡ Screw (M1.7 × 4)
0 Housing (L) assy
1 Pad, ear
!™ MDD01 (L-CH)
!£ Remove solder
9 Holder, ball shaft
7 Remove solder
4 Cover (L), hanger
6 Case, battery
2 Cover, battery

— 4 —
Notes:
1. Use transmitter with check and adjustment alreadycompleted.
2. The transmitter section adjustments should be completed before
performing the headphones section adjustment.
3. On adjusting the headphones section, use the transmitter as a jig.
Procedure:
1. Feed a signal to jig (transmitter) and connect a power supply to
DC IN 9V jack (J404).
Receive frequency check and adjustment
1. Set the transmitter channel to CH2.
2. Set the transmitter noise filter SW to OFF .
3. Input a signal of 1kHz 316mVrms to onl y the transmitter L-
CH (J403).
4. Place transmitter and headphones at a distance of more than 5m
apart.
5. Set the VOL (RV301) to MIN.
6. Position RX board TUNINGVOL (RV302) to the center .
7. Connect a digital voltmeter (DC range) and an oscilloscope
between
IC301 pin @¡ and GND.
8. First check to make sure that a demodulated waveform of 1kHz
(appr oximately 13mVrms) is outputted to the oscilloscope ,
then
check to make sure the DC voltmeter reading is DC 1 to 1.2V .
9. If a demodulated waveform of 1kHz is not outputted to the
oscilloscope or if the DC level is not within the range specified
above, adjust the RX board L301 so that a demodulated
waveform of 1kHz is outputted to the oscilloscope and while
the wave-form is outputted, further fine adjust the L301 so that
the DC voltmeter reading is DC1.1V.
10. When completed, make sure signals can be received when
switching the transmitter channel to CH1 or CH3 by turning
RX board TUNING VOL (RV302).
Connection points andAdjustment Location:
RX BOARD (See page 5)
Separation check and adjustment
1. Set the transmitter channel to CH2.
2. Set the transmitter noise filter SW to OFF .
3. Input a signal of 1kHz 316mVrms to onl y the transmitter L-
CH (J403).
4. Connect an digital voltmeter (AC range) and oscilloscope to
the L-CH speaker outputs (both sides of MDD01).
5. Receive signals by turning the TUNING VOL (RV302).
6. Adjust the VOL (RV301) so that the RX board L-CH speaker
outputs (both sides of MDD01) are 155mVrms.
7. Connect an digital voltmeter (AC range) and oscilloscope to
the R-CH speaker outputs (both sides of MDD02) and measure
the voltages.
8. At this time, check to make sure the level separation of L-CH
and R-CH speaker outputs is more than 20dB. If the separation
is less than 20dB, turn RV303 on the RX boar d so that the R-
CH output is minimal, then check to see if the level separation
of L-CH and R-CH speaker outputs is more than 20dB.
9. Input a signal of 1kHz 316mVrms to only the transmitter R-CH
(J402).
10. Adjust the VOL (RV301) so that the RX boar d R-CH speaker
outputs (both sides of MDD02) are 155mVrms.
11. Connect an digital voltmeter (AC range) and oscilloscope to
the L-CH speaker outputs (both sides of MDD01) and measure
the voltages.
12. At this time, check to make sure the level separation of L-CH
and R-CH speaker outputs is more than 20dB.
Connection points andAdjustment Location:
RX BOARD (See page 5)
SECTION 2
ELECTRICAL ADJUSTMENTS
Headphones
MDR-RF830 Transmitter TMR-RF830R
Transmitter
J404
power supply
(DC 9V)
L-CH (J403)
1kHz 316mVrms (–7.8dB)
AF OSC
ATT Jig
600
Ω

MDR-RF830
— 5 — — 6 —
Connection points :
Adjustment Location :
[ RX BOARD ] (Conductor side)
Oscilloscope
Digital voltmeter
(AC range)
Oscilloscope
Digital voltmeter
(DC range)
RV302
Tuning Knob
RV301
VOL Knob
L301 : Receive Frequency Adjustment
RV303 : Separation Adjustmen t
[RX BOARD](Component side)
SECTION 3
DIAGRAMS
24 23 22 21 20 19 18 17 16 15 14 13
1 2 3 4 5 6 7 8 9 10 11 12
REGULATOR
AM•FE
FM•FE
RIPPLE
FILTER
TUNING
METER
DETUNE
DET
FM•IF
DISCRI
AM•IF
DET•AGC
DETUNE DET CONTROL VCC RIPPLE FILTER DET OUT AFC AGC AFC AGC AM IF OUT GND METER FM IF IN AM IF IN FM/AM BAND SELECT
DETUNE DET
GND
FM DISCRI
AM OSC
AFC
FM OSC
REG OUT
FM RF
AM RF IN
NC
FM RF IN
GND
FM/AM
FE OUT
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
• IC BLOCK DIAGRAMS
IC302 LA4533M
IC301 CXA1611N-T4

MDR-RF830
— 7 — — 8 —
Note:
•X: parts extracted from the component side.
•®:Through hole.
•b: Pattern from the side which enables seeing.
Caution:
Pattern face side: Partsonthepattern facesideseenfrom
(SideB) the pattern face are indicated.
Parts face side: Parts on the parts face side seen from
(Side A) the parts face are indicated.
3.1 PRINTED WIRING BOARDS
Ref. No. Location
D301 B-3
D302 E-3
D303 D-4
IC301 D-3
IC302 C-4
IC303 C-3
IC304 C-3
Q301 C-3
Q302 E-3
Q303 C-4
Q304 E-4
Q305 E-3
Q306 E-3
Q307 C-3
Q308 D-3
Q309 C-3
• Semiconductor
Location

MDR-RF830
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.
•¢: internal component.
•U: B+ Line.
•H: adjustment for repair.
• Power voltage is dc 3 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— 9 — — 10 —
r
WAVEFORM
1
IC301 @¡
VOLT/DIV : 2m V AC
TIME/DIV : 20 µsec
10mVp-p
20.4
µ sec
3.2 SCHEMATIC DIAGRAM • Refer tp page 6 IC Block Diagrams.

MDR-RF830
— 11 — — 12 —
SECTION 4
EXPLODED VIEW
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
delayshould be anticipated when ordering these
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.
Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks
1 4-994-129-01 PAD, EAR
2 X-4950-086-1 HOUSING (R) ASSY
3 4-994-119-01 HANGER (R)
4 4-992-281-01 HOLDER, BALL SHAFT
5 4-210-280-01 PLATE, RX SHIELD
*6 A-4542-535-A RX BOARD, COMPLETE
7 4-994-121-11 COVER (R), HANGER
8 3-713-791-01 SCREW (M1.7X4), TAPPING, P2
9 4-995-597-01 SPACER
10 4-994-124-11 SUSPENDER
11 4-994-118-01 BAND, HEAD
12 4-994-123-11 COVER, BATTERY
13 X-4950-087-1 HOUSING (L) ASSY
14 4-995-475-01 SPRING, TENSION
15 4-994-130-01 TERMINAL (+), BATTERY
16 4-994-132-01 TERMINAL (MIDWAY), BATTERY
17 4-993-020-01 CASE, BATTERY
18 4-994-131-01 TERMINAL (-), BATTERY
19 4-994-122-01 COVER (L), HANGER
20 4-994-120-01 HANGER (L)
21 3-831-441-99 CUSHION, SPEAKER
*22 A-4542-536-A FE BOARD, COMPLETE
MDD01 1-505-117-21 RECEIVER (L-CH)
MDD02 1-505-117-21 RECEIVER (R-CH)
SW1 1-771-249-11 SWITCH, PUSH (1 KEY)(POWER)
4-1. EXPLODED VIEW
SECTION 5
ELECTRICAL PARTS LIST
NOTE:
• Due to standardization, replacements in the
parts list may be different from the parts
specifiedinthe diagrams or the components
used on the set.
• -XX, -X mean standardized parts, so they
may have some difference from the original
one.
• RESISTORS
All resistors are in ohms.
METAL: metal-film resistor
METAL OXIDE: Metal Oxide-film resistor
F: nonflammable
When indicating parts by reference number,
please include the board name.
• Items marked “*” are not stocked since they
are seldom required for routine service.
Some delay should be anticipated when
ordering these items.
• SEMICONDUCTORS
In each case, u: µ, for example:
uA...: µA... , uPA... , µPA... ,
uPB... , µPB... , uPC... , µPC... ,
uPD..., µPD...
• CAPACITORS:
uF: µF
• COILS
uH: µH
Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks
*A-4542-536-A FE BOARD, COMPLETE
******************
************************************************************
*A-4542-535-A RX BOARD, COMPLETE
******************
< CAPACITOR >
C301 1-124-589-11 ELECT 47uF 20% 16V
C302 1-164-489-11 CERAMIC CHIP 0.22uF 10% 16V
C303 1-162-921-11 CERAMIC CHIP 33PF 5% 50V
C306 1-164-227-11 CERAMIC CHIP 0.022uF 10% 25V
C307 1-162-927-11 CERAMIC CHIP 100PF 5% 50V
C309 1-126-572-11 ELECT 4.7uF 20% 35V
C310 1-110-563-11 CERAMIC CHIP 0.068uF 10% 16V
C311 1-162-923-11 CERAMIC CHIP 47PF 5% 50V
C312 1-162-970-11 CERAMIC CHIP 0.01uF 10% 25V
C313 1-162-926-11 CERAMIC CHIP 82PF 5% 50V
C314 1-162-957-11 CERAMIC CHIP 220PF 5% 50V
C315 1-124-233-11 ELECT 10uF 20% 16V
C316 1-164-245-11 CERAMIC CHIP 0.015uF 10% 25V
C317 1-162-970-11 CERAMIC CHIP 0.01uF 10% 25V
C318 1-164-346-11 CERAMIC CHIP 1uF 16V
C319 1-164-505-11 CERAMIC CHIP 2.2uF 16V
C320 1-164-346-11 CERAMIC CHIP 1uF 16V
C321 1-164-346-11 CERAMIC CHIP 1uF 16V
C322 1-124-242-00 ELECT 33uF 20% 25V
C324 1-107-725-11 CERAMIC CHIP 0.1uF 10% 16V
C325 1-107-725-11 CERAMIC CHIP 0.1uF 10% 16V
C326 1-124-635-00 ELECT 220uF 20% 6.3V
C327 1-124-635-00 ELECT 220uF 20% 6.3V
C328 1-124-635-00 ELECT 220uF 20% 6.3V
C329 1-164-346-11 CERAMIC CHIP 1uF 16V
C330 1-162-964-11 CERAMIC CHIP 0.001uF 10% 50V
C331 1-162-912-11 CERAMIC CHIP 7PF 0.5PF 50V
C332 1-164-441-11 CERAMIC CHIP 68PF 5% 50V
C333 1-163-021-91 CERAMIC CHIP 0.01uF 10% 50V
C334 1-124-233-11 ELECT 10uF 20% 16V
C335 1-162-924-11 CERAMIC CHIP 56PF 5% 50V
C336 1-162-924-11 CERAMIC CHIP 56PF 5% 50V
C337 1-162-970-11 CERAMIC CHIP 0.01uF 10% 25V
C338 1-163-037-11 CERAMIC CHIP 0.022uF 10% 25V
C339 1-164-489-11 CERAMIC CHIP 0.22uF 10% 16V
C340 1-164-346-11 CERAMIC CHIP 1uF 16V
C341 1-162-966-11 CERAMIC CHIP 0.0022uF 10% 50V
C342 1-162-923-11 CERAMIC CHIP 47PF 5% 50V
C350 1-163-021-91 CERAMIC CHIP 0.01uF 10% 50V
C352 1-162-198-31 CERAMIC 8.2PF 10% 50V
C355 1-162-919-11 CERAMIC CHIP 22PF 0.5PF 50V
< FILTER >
CF301 1-577-588-11 FILTER, CERAMIC
CF302 1-567-163-11 FILTER, CERAMIC
< DIODE >
D301 8-719-045-99 DIODE RD2.2M-T1B
D302 8-719-002-81 DIODE 1T363
D303 8-719-066-57 LED SA2512 (POWER)
< FERRITE BEAD >
FB301 1-414-234-11 INDUCTOR CHIP 0UH
FB302 1-414-234-11 INDUCTOR CHIP 0UH
FB303 1-414-234-11 INDUCTOR CHIP 0UH
FB304 1-414-234-11 INDUCTOR CHIP 0UH
FB305 1-414-234-11 INDUCTOR CHIP 0UH
FB306 1-414-234-11 INDUCTOR CHIP 0UH
< IC >
IC301 8-752-066-93 IC CXA1611N-T4
IC302 8-759-802-75 IC LA4533M
IC303 8-759-195-02 IC TC7S86F-TE85L
IC304 8-759-096-87 IC TC7WU04FU(TE12R)
< JUMPER RESISTOR >
JC301 1-216-296-91 SHORT 0
JC302 1-216-296-91 SHORT 0
JC303 1-216-296-91 SHORT 0
JC304 1-216-296-91 SHORT 0
JC305 1-216-296-91 SHORT 0
JC308 1-216-864-11 METAL CHIP 0 5% 1/16W
JC309 1-216-295-91 SHORT 0
JC310 1-216-864-11 METAL CHIP 0 5% 1/16W
JC312 1-216-295-91 SHORT 0
JC313 1-216-864-11 METAL CHIP 0 5% 1/16W
JC314 1-216-864-11 METAL CHIP 0 5% 1/16W
JC315 1-216-864-11 METAL CHIP 0 5% 1/16W
JC316 1-216-295-91 SHORT 0
JC317 1-216-295-91 SHORT 0
< COIL >
L301 1-422-317-31 COIL, AIR-CORE
L302 1-412-933-11 INDUCTOR 0.33uH
L303 1-414-140-11 INDUCTOR 0.68uH
RXFE
11
12
21
15 16
14
17
18
4
20
8
13
19
8
1
8
2
4
5
3
6
9
8
14
22
7
1
8
10
MDD01
#3
#2
MDD02
#2
#2
#2
SW1
#3
(Included
in Ref. No. 6)
(Including
Ref. No. 22)

— 13 —
< TRANSISTOR >
Q301 8-729-230-49 TRANSISTOR 2SC2712-YG
Q302 8-729-230-49 TRANSISTOR 2SC2712-YG
Q303 8-729-230-49 TRANSISTOR 2SC2712-YG
Q304 8-729-230-49 TRANSISTOR 2SC2712-YG
Q305 8-729-230-49 TRANSISTOR 2SC2712-YG
Q306 8-729-920-31 TRANSISTOR DTC343TK
Q307 8-729-230-49 TRANSISTOR 2SC2712-YG
Q308 8-729-040-78 TRANSISTOR DTA124GKA-T146
Q309 8-729-027-36 TRANSISTOR DTA143XKA-T146
< RESISTOR >
R301 1-216-857-11 METAL CHIP 1M 5% 1/16W
R302 1-216-101-00 METAL CHIP 150K 5% 1/10W
R303 1-216-081-00 METAL CHIP 22K 5% 1/10W
R304 1-216-061-00 METAL CHIP 3.3K 5% 1/10W
R305 1-216-101-00 METAL CHIP 150K 5% 1/10W
R306 1-216-853-11 METAL CHIP 470K 5% 1/16W
R307 1-216-845-11 METAL CHIP 100K 5% 1/16W
R308 1-216-089-91 RES,CHIP 47K 5% 1/10W
R309 1-216-841-11 METAL CHIP 47K 5% 1/16W
R310 1-216-817-11 METAL CHIP 470 5% 1/16W
R311 1-216-821-11 METAL CHIP 1K 5% 1/16W
R312 1-216-853-11 METAL CHIP 470K 5% 1/16W
R313 1-216-827-11 METAL CHIP 3.3K 5% 1/16W
R314 1-216-822-11 METAL CHIP 1.2K 5% 1/16W
R315 1-216-830-11 METAL CHIP 5.6K 5% 1/16W
R316 1-216-827-11 METAL CHIP 3.3K 5% 1/16W
R317 1-216-061-00 METAL CHIP 3.3K 5% 1/10W
R318 1-216-831-11 METAL CHIP 6.8K 5% 1/10W
R319 1-216-061-00 METAL CHIP 3.3K 5% 1/10W
R320 1-216-845-11 METAL CHIP 100K 5% 1/16W
R321 1-216-843-11 METAL CHIP 68K 5% 1/16W
R322 1-216-843-11 METAL CHIP 68K 5% 1/16W
R323 1-216-859-11 RES,CHIP 1.5M 5% 1/16W
R324 1-216-033-00 METAL CHIP 22 5% 1/10W
R325 1-216-825-11 METAL CHIP 2.2K 5% 1/16W
R326 1-216-827-11 METAL CHIP 3.3K 5% 1/16W
R327 1-216-809-11 METAL CHIP 100 5% 1/16W
R328 1-216-835-11 METAL CHIP 15K 5% 1/16W
R329 1-216-001-00 METAL CHIP 10 5% 1/10W
R330 1-216-001-00 METAL CHIP 0 5% 1/10W
R331 1-216-097-91 RES,CHIP 100K 5% 1/10W
R334 1-216-845-11 METAL CHIP 100K 5% 1/16W
R335 1-216-029-00 METAL CHIP 150 5% 1/10W
R342 1-216-831-11 METAL CHIP 6.8K 5% 1/16W
R345 1-216-841-11 METAL CHIP 47K 5% 1/16W
R348 1-216-831-11 METAL CHIP 6.8K 5% 1/16W
R349 1-216-001-00 METAL CHIP 10 5% 1/10W
R350 1-216-823-11 METAL CHIP 1.5K 5% 1/16W
R360 1-216-837-91 METAL CHIP 22K 5% 1/16W
< VARIABLE RESISTOR >
RV301 1-223-968-11 RES, VAR, CARBON 20K/20K (VOL)
RV302 1-225-641-11 RES, VAR, CARBON 10K (TUNING)
RV303 1-238-601-11 RES, ADJ, CARBON 22K (SEPARATION)
************************************************************
Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks
MISCELLANEOUS
*************
MDD01 1-505-117-21 RECEIVER (L-CH)
MDD02 1-505-117-21 RECEIVER (R-CH)
SW1 1-771-249-11 SWITCH, PUSH (1 KEY)(POWER)
************************************************************
*************
HARDWARE LIST
*************
#1 7-685-106-19 SCREW +P2X10 TYPE2 NON-SLIT
#2 7-685-105-19 SCREW +P2X8 TYPE2 NON-SLIT
#3 7-685-107-19 SCREW +P2X12 TYPE2 NON-SLIT