Kenwood RXD-251 User manual

MINI HiFi COMPONENT SYSTEM
RXD-251/301/301E/301W/
RXD-351/351E/351W/371S/A3
SERVICE MANUAL
© 1998-7/B51-5454-00 (K/K) 3763
(XD-251~A3)**
In compliance with Federal Regulations, following are reproduc-
tions of labels on, or inside the product relating to laser product
safety.
**Refer to page 2 if you want to know system configuration.
KENWOOD-Crop. certifies this equipment conforms to DHHS
Regulations No. 21 DFR 1040. 10, Chapter 1, Subchapter J.
DANGER : Laser radiation when open and interlock defeated.
AVOID DIRECT EXPOSURE TO BEAM
Panel(CD) *
(A60-)
Front glass *
(A29-)
Knob *
(K29-)
Knob
(K29-7512-08)
Knob
(K29-7519-08)
Knob
(K29-7518-08)
Phone jack
(E11-0386-08)
Konb
(K-29-7516-08)
Cassette lid(R) *
(A53-)
Front glass(R)
(B10-3451-08)
Front panel *
(A60-)
Knob *
(k29-)
Knob
(K29-7523-08)
Knob
(K29-7522-08)
Knob
(K29-7521-08)
Cassette lid(L) *
(A53-)
Front glass(L)
(B10-3450-08)
Knob
(K29-7515-08)
Knob
(K29-7511-08)
Mic jack
(E11-0387-08)
Knob *
(K29-)
Knob *
(K29-)
Knob
(K29-7513-08)
Illust. is RXD-351.
* Refer to parts list on page 38.

FM indoor antenna (1)
Europe and U.K. Other countries
AM
(T90-0815-08)
loop antenna (1)
AC
(E03-0115-05)
plug adaptor (1)
Remote
(A70-1260-08)
control unit (1)
Batteries (R6/AA) (2)
Use to adapt the plug on the power cord
to the shape of the wall outlet.
(Accessory only for regions where use is
necessary.)
(T90-0801-05)
: K1P1Y1M1M2M3X1X2X3
(T90-0836-05)
: E1E2E3E4T1T2Q1Q2
Operation to reset
The microcomputer may fall into malfunction (impossibility to oper-
ate, erroneous display, etc.) when the power cord is unplugged
while power is ON or due to an external factor. In this case, execute
the following procedure to reset the microcomputer and return it to
normal condition.
Press the "POWER" key while holding the Stop (7) key of
the CD section pressed, to switch off the power, and then
switch the power on again after a few seconds.
÷ Please note that resetting the microcomputer clears the contents
stored in and returns and to condition when it left the factory.
SYSTEM MAIN UNIT DESTINATION SPEAKER
XD-301 RXD-301 E3T2X3 LS-N301
XD-301E RXD-301E E4 LS-N301
XD-301W RXD-301W Q2 LS-N301
XD-351 RXD-351 E1T1 LS-N351
XD-351 RXD-351 M1X1Y1 LS-N371
XD-351E RXD-351E E2 LS-N351
XD-351W RXD-351W Q1 LS-N351
XD-A3 RXD-A3 K1P1 LS-N351
XD-371S RXD-371S M2 LS-N371
XD-251 RXD-251 M3X2 LS-N351
RXD-251/301/351/371S/A3
2
CONTENTS / ACCESSORIES
CONTENTS / ACCESSORIES ....................................2
EXTERNAL VIEW........................................................3
CONTROLS.................................................................4
BLOCK DIAGRAM.......................................................6
CIRCUIT DESCRIPTION.............................................7
CD MECHANISM OPERATION DESCRIPTION .........9
ADJUSTMENT.......................................................... 11
WIRING DIAGRAM....................................................15
PARTS DESCRIPTIONS...........................................16
PC BOARD ................................................................17
SCHEMATIC DIAGRAM............................................23
EXPLODED VIEW .....................................................37
PARTS LIST...............................................................38
SPECIFICATIONS.....................................................47
Contents
Accessories
System configuration Cautions

RXD-251/301/351/371S/A3
3
EXTERNAL VIEW
Slide switch
(S62-0083-08)
AC power cord *
(E30-)
Cabinet *
(A01-)
Phono jack
(E63-1073-08)
Slide switch
(S62-0057-08)
Lock terminal board
(E70-0108-08)
Antenna terminal *
(E70-)
Illust. is RXD-351.
* Refer to parts list on page 38.

RXD-251/301/351/371S/A3
4
CONTROLS
CD unit
DISC 1 DISC 2 DISC 3
076
¢

4
DISC
SKIP
12 3 456
7
Receiver unit
ON/STANDBY
INPUT
STANDBY
MIC 1
MIC 2
MIC VOLUME
MIN.
MAX.
TIMER SET
CLOCK
DISPLAY
/DEMO
ROCK
FLAT
EX.BASS
POP
JAZZ
BAND TUNING
PHONES
UP
DOWN
AUTO
PRESET
MANUAL
PRESET
AUTO/MONOTIMER
8
9
0
!
@
#$ %
&
()
¡

™

£

^
*
¢

∞

1 Skip ( 4 , ¢ ) keys
2 DISC SKIP key
Used to skip discs.
3
Disc selection keys
The disc number is selected directly and playback starts.
4
OPEN/CLOSE ( 0 ) key
The disc tray is opened and closed.
5
Stop ( 7 ) key
6 Play/pause ( 6 ) key
7 Disc tray
Three discs can be stored.
8
ON/STANDBY ( ) key
9 INPUT key
Key for input switching.
0
TIMER key
Key for timer START/STOP switching.
!
MIC 1/MIC 2 jack (except for some areas)
@ MIC VOLUME knob (except for some areas)
# TIMER SET key
Used for setting the timer ON/OFF time.
$
CLOCK key
Used to set the present time.
%
DISPLAY/DEMO key
Switches the display contents.
*Used for demonstration (DEMO) ON/OFF.
^
AUTO/MONO key
Switches the tuning mode.
&
MANUAL PRESET key
Used to memorize broadcasting stations in the desired order.
*
BAND key
Press to switch the receiving band.
(
TUNING/ keys
Used for tuning to broadcasting stations and for time settings.
)
PHONES terminal
For connection of a headphone (optional).
¡
AUTO PRESET key
Used for automatic presetting of broadcasting stations.
™
VOLUME CONTROL knob
This is used for volume adjustment.
£
Sound selection keys
Used to select the desired sound type.
FLAT : For listening without changing the sound.
JAZZ : A sound quality curve suitable for jazz.
POP : A sound quality curve suitable for popular
music.
ROCK : A sound quality curve suitable for rock-and-roll.
EX.BASS: For listening with abundant bass. (Can be used
together with other sound selection keys.)
¢ Display
∞ STANDBY indicator (Except for some areas)

RXD-251/301/351/371S/A3
5
CONTROLS

RXD-251/301/351/371S/A3
6
BLOCK DIAGRAM
CE
DI
CL
VREF
24 23 20 19 16 14
1
2 5
9
11
23
3,28 2,29 1,30
+
+
TUNER
CD
AUX
CONTROL
SERIES
DATA
A/B
PLAY
AMP
ALC
PLAY
R/P OSC
BIAS
(Q209,L201)
Q205
Q203 Q204
Q206 Q201Q202
TAPE OUT
TAPE
Q405,406
REC BUFFER
IC402
TAPE OUT REC OUT REC IN
DECK A/B SW
Q213
+B
IC301
MIC AMP
MIC IN
Q403,404
+3dB AMPPRE SET
EQ.
PRE AMP
IC404
EX-BASS
412
Q411,
410
Q409, RL501
Q413,
414
MUTE
SYSTEM 714
-10dB
ATTENUATOR
Q713,
POWER AMP
IC501 +VCC
-VCC Q504-506
DETECTOR
IC502
SPEAKER
PROTECTOR
+12V
512
Q511,
MUTE
JACK
SPEAKER
Lch
HEADPHONES
JK502
Rch
JK501
+5.5V Q702
+7.5V +12V
Q701
Q704
+VCC
SWITCHED
to
X'FORMER
-12V Q709
+12V
-VCC
CN701
D702-705
D701
Q705,
706
Q703
LCD DISPLAY
IC601
u-COM
KEY
MATRIX
CN09
to CD PCB
CN401
to MAIN PCB
RF
AMP FILTER
RC
TUNE AMP
MIX IFT CF1
BUFFOSC
TUNE
AMP
IF CF2
TUNE
AM RF
AMP
RF
Q106
FM SECTION
Q101
PLL
IFT
AM u-COM
IC201
L.P.F
Q107,108
7.2MHz
AM SECTION
V.T.
AM ANT
GND
FM ANT OUT
MIX
BUFF
AMP
TUNE
AM ANT
GND
FM ANT AMP
AM RF
TUNE OSC
ANT RF
IFT
PLL
L.P.F
Q107,108
AMP
RF IC201
u-COM
AMP
Q106
IFT CF1 IF FILTER
AM SECTION
AM
FM SECTION
CF2 OUT
RC
IC102
IC102
TUNE
FM RF
FM
OSC
Q102
GND
IC01 CXA1782BQ
RF SIGNAL PROCESSING/SERVO AMP
PROCESSOR W/DAC
DIGITAL SIGNAL
CD POWER DRIVER
IC03 BA5936S
I/O PORT EXTENSION
IC02 74HC4094
IC04 CXD2508Q
XTL01
33.86MHz
IC15 NJM4558L
OPAMP
MMOTOR
DISC
MOTOR
FEED
M
TRACKING
FOCUS
TRAY MOTOR
T/T MOTOR
SW
LIMIT IN
OUTPUT
AUDIO
CONTROL SW
S01-04
Rch
Lch
u-COM
SUB WOOFER
IC602
-VCC
+VCC
PRE AMP JK601
USED RXD-301(X3)/
RXD-351(M1,X1)/
RXD-371S(M2)
IC201
FM FRONT-END
FM RF IC101
TUNER UNIT
CD MECHA. UNIT
TUNER UNIT
AUDIO UNIT/DISPLAY UNIT
RXD-351
IC401
RXD-A3(K1,P1) TYPE ONLY

No. Name I/O Description Active
HL
1 CE I LC7218, LC75392 CE out
2 ENABLE – No used
3 DI I LC7218, LC75392, 74HC4094 data out
4 DO O Data output to LC7218
5 CLK I LC 7218, LC75392, 74HC4094 clock out
6 DATA O Serial data out to CXD2508Q
7 SQCO I Serial output of SUBQ 80BIT
8 SQCK O Clock output
9 XLAT O Latch output
10 FOK O Focus OK output
11 GND – GND
12 RESET I Reset signal input
13 POWER - DOWN I Power down input
14 SENS I CXD2508Q sens
15 VSS – Vss
16 X1 – Xtal 6.0MHz
17 X2 – Xtal 6.0MHz
18 VDD1 – Vdd
19~22 K1~K4 I Key input (K1~K4)
23, 24 GND – GND
25 MODE - SW2 I Model discrimination (RXD-371S only)
26 MODE - SW1 I Model discrimination
27 SCOR I CXD2508Q Sub - code synch detect
28 COUNT O Track number count signal output
29 REMOTE IN I Remote signal input
30 VR + I VR encoder input A
31 VR - I VR encoder input B
32 PIC - UP I Pick - up SW
33 PIC - DOWN I Pick - down SW
34 DISC - COUNT I Disc counter SW
35 TURNTABLE - SW I Turntable SW
36 TRAY - OPEN I Tray open SW
37 TRAY - CLOSE I Tray close SW
38 N/C – No used
39 VR - 1 O VR step extend out 0, 1 step others
40~51 N/C – No used
52~55 S1 - S4 O Segment out (1~4)
56 VDD2 – Vdd
57 VSS2 – Vss
58~79 S5~S26 O Segment out (5~26)
80~82 BIAS 3~1 – GND
83~86 COM - 0~3 O FL Common 0~3
87 FM - STEREO I FM stereo signal input Mono Stereo
88 SYN REC I Synchro start input
89 VSS3 – Vss
RXD-251/301/351/371S/A3
7
CIRCUIT DESCRIPTION
1. Microprocessor : (IC601, LC867224A-5H71)
1-1 Pin description

PORT SW 1 SW 2 SW 3 SW 4 SW 5 SW 6 SW 7 SW 8 SW 9 SW 10
Pin 19 Power Input Clock Timer Timer Display EQ Off Rock Jazz Pop
(K1) Set Mode Set
Pin 20 Tuning Tuning Band Auto/ Auto Manual EX Bass – – –
(K2) Up Down Mono Preset Preset
Pin 21 CD AMS - – – Disc Disc 1 Disc 2 Disc 3 Open –
(K3) AMS + Skip Close
Pin 22 CD CD Play FF – – – – – – –
(K4) Stop Pause
RXD-251/301/351/371S/A3
8
CIRCUIT DESCRIPTION
No. Name I/O Description Active
HL
90 VDD3 – Vdd
91 POWER - SW O Power SW out On Off
92 SYS - MUT O System mute out Off On
93 TU - MUT O Tuner mute out On Off
94 MODE - SW - IN I No used
95 FUNCTION - TAPE O Function tape out Tape Others
96 LCD - BACK - LIGHT O LCD back light control On Off
97 N/C – No used
98 EX - BASS O EX - bass control On Off
99 LATCH – No used
100 STB O 74HC4094 strobe
PIN NAME I/O DESCRIPTION ACTIVE
4 MUTE O CXD2508Q Muting (DAC) H : ON L : OFF
5 CONTROL O CXA1782BQ, CXD2508Q Vdd control H : Others L : CD
6 XRST O CXD2508Q XRST
7 T • T + O T • T/U • D Motor (+)
11 CONTROL O T • T Motor speed Control
12 TRAY - O Tray Motor Control (-)
13 TRAY + O Tray Motor Control (+)
14 T • T - O T • T/U • D Motor (-)
4. All LCD light on mode
• The all LCD light up when the STOP key and TIMER SET key are pressed simultaneously, while the power is ON.
• When the ON/STANDBY key is pressed, the all LCD light on mode is canceled.
2. Key matrix
3. I/O port extension (CD mecha. unit)
IC02 (74HC4094)

RXD-251/301/351/371S/A3
9
CD MECHANISM OPERATION DESCRIPTION
ROTARY MOTOR
GEAR
PULLEY
RELAY
GEAR A
RELAY
GEAR B
TR LOCK
GEAR
UD-CAM
UD REDUCE
GEAR
CHANGE
GEAR
TURN TABLE
DISC 2 DISC 1
DISC 3
DISC SW
Fig.1
SW C
TRAY MOTOR
Fig.3 Fig.2
2
3
TR GEAR SENSOR SW
(STOP POSITION OF DISC 3)
1. In case of disc 3 (Refer to figure 1 and 2)
1The rotary motor turns counterclockwise by pressing disc 3 key, therefore the turntable turns clockwise and disc 3 is detect-
ed by disc number detector switch.
2The turntable stops the position of 3marked as figure 2 and stop position of disc 3 is detected by sensor switch.
At this time, the position of TR lock gear is as shown figure 1.
3The rotary motor turns clockwise and the relay gear B also turns clockwise.
By turning the relay gear B, the arm of relay gear B moves to arrow direction (2 7 7 7) and the TR lock gear will be
locked.
After that, the change gear separates from TR lock gear.
4The UD reduce gear turns clockwise by turning the change gear.
5The traverse moves up-side.
6After finished the traverse operation, the disc motor turns and the disc 3 will be played.
2. Open/Close operation of tray
while playing the disc.
(Refer to figure 3)
1The tray motor turns clockwise by pressing
open/close key while playing the disc.
2The change base moves to frontward by
turning the TR gear.
3Pushing switch C by change base, the tray
motor stops.

RXD-251/301/351/371S/A3
10
CD MECHANISM OPERATION DESCRIPTION
How to replace the pick up. (Refer to figure 4~7)
1. Remove the screws (1x 4), top chassis and spring (2x 2).
2. Detach the traverse unit by removing shield (bottom side) and screws (3x 2).
3. Short the short land and remove screws (4x 4, 5x 1).
4. Remove the rod and replace the pick up.
1x2
1x2
3x1
3x1
2x2
2x1
Fig.4 Fig.5
BOTTOM VIEW
4x2 4x2
5x1
Fig.7
Fig.6
SHORT LAND
TOP VIEW

RXD-251/301/351/371S/A3
NO.
ITEM
INPUT
SETTING
OUTPUT
SETTING
TUNER
SETTING
ALIGNMENT
POINTS
ALIGN FOR
FIG.
1.
IF
(A)
98 MHz,1 kHz MOD
±75 KHz (DEV)
60dBu(ANTINPUT)
(B)
98MHz
T101
Maximum output
(Minimum distortion
2.
LOWEND
TRACKING
(A)
87MHz, 1 kHz MOD
±75 kHz (DEV)
35dBu( ANTINPUT)
(B)
87MHz
L102
Maximum output
3.
HIEND
TRACKING
(A)
108MHz,1 kHz MOD
±75 kHz (DEV)
35dBu(ANTINPUT)
(B)
108MHz
TC101
Maximum output
4.
VT
–
Connect the DC
voltage meter to
TP2.
87.5 MHz
L103
VT=1.0V±0.05V
108MHz
–
Check the
VT=7.0V±1.0V
NO.
ITEM
INPUT
SETTING
OUTPUT
SETTING
TUNER
SETTING
ALIGNMENT
POINTS
ALIGN FOR
FIG.
1.
IF
(A)
531 kHz or 530 kHz
1 kHz, 30% MOD
60dBu(ANTINPUT)
(B)
531 kHz
or
530 kHz
T102
Maximum output
(Minimum distortion)
2.
LOWEND
TRACKING
(A)
531 kHz or 530 kHz
1 kHz, 30% MOD
30dBu(ANTINPUT)
(B)
531 kHz
or
530 kHz
L104
Maximum output
3.
HIGHEND
TRACKING
(A)
1602 kHz or 1610 kHz
1 kHz, 30% MOD
30dBu(ANTINPUT)
(B)
1602 kHz
or
1610 kHz
TC102
Maximum output
4.
VT
–
Connect the DC
voltage meter to
TP2.
531 kHz
L105
VT=1.2V±0.05V
1602 kHz
–
Check the
VT=7.3V±1.0V
NO.
ITEM
INPUT
SETTING
OUTPUT
SETTING
TUNER
SETTING
ALIGNMENT
POINTS
ALIGN FOR
FIG.
1.
IF
5.95 MHz
1 kHz, 30% MOD
60dBu(ANTINPUT)
(D)
(B)
5.95 MHz
T102
Maximum output
(Minimum distortion)
2.
LOWEND
TRACKING
5.95 MHz
1 kHz, 30% MOD
30dBu(ANTINPUT)
(D)
(B)
5.95 MHz
L201
Maximum output
3.
HIGHEND
TRACKING
17.9 MHz
1 kHz, 30% MOD
30dBu(ANTINPUT)
(D)
(B)
17.9 MHz
TC201
Maximum output
4.
VT
–
Connect the DC
voltage meter to
TP2.
5.95 MHz
L202
VT=1.0V±0.05V
17.9 MHz
–
Check the
VT=8.4V±1V
11
RXD-251/301/351/371S/A3
ADJUSTMENT
FM SECTION (Except for Europe version)
* Europe version no Adjustment
MW SECTION
SW SECTION

RXD-251/301/351/371S/A3
FM 75 ΩAM
ANTENNA
Europe
and U.K.
Other
countries
AM
FM 75 Ω
GND
(A)
(C)
(D) AM-SG
FM-MPX-SG
FM-MPX-SG
POLAR SG Dummy antenna
Oscilloscope
AC voltmeter
(B)
Distortion meter
TO TUNER UNIT
CN101, pin 9 (Lch)
pin 7 (Rch)
pin 8 (GND)
NO.
ITEM
INPUT
SETTING
OUTPUT
SETTING
TUNER
SETTING
ALIGNMENT
POINTS
ALIGN FOR
FIG.
1.
IF
153 kHz
1 kHz, 30% MOD
60dBu(ANTINPUT)
(D)
(B)
153 kHz
T102
Maximum output
(Minimum distortion)
2.
LOWEND
TRACKING
153 kHz
1 kHz, 30% MOD
30dBu(ANTINPUT)
(D)
(B)
153 kHz
L201
Maximum output
3.
HIGHEND
TRACKING
279 kHz
1 kHz, 30% MOD
30dBu(ANTINPUT)
(D)
(B)
279 kHz
TC201
Maximum output
4.
VT
–
Connect the DC
voltage meter to
TP2.
153 kHz
L202
VT=1.0V±0.05V
279 kHz
–
Check the
VT=5.0V±1.0V
ADJUSTMENT
12
LW SECTION
INSTRUMENTS CONNECTION

RXD-251/301/351/371S/A3
NO.
ITEM
INPUT
SETTINGS
OUTPUT
SETTINGS
CASSETTE TAPE
DECK SETTINGS
ALIGNMENT
POINT
ALGN FOR
FIG
.
Unless otherwise specified : each ; switch should be set as follows : 0dBs = 0.775V
BEAT SW : OFF
I. Cassette mechanism section (REC/PB head adjustment)
[1]
Demagnetization
and cleaning
–
–
PowerOFF,
demagnetization,
cleaning play
REC/PB head,
erase head.
capstan, pinch
roller
Demagnetize the REC/PB
head by head eraser. Clean
the REC/PB head, erase
head capstan and pinch
roller with a cotton swab
immersed in alcohol.
[2]
REC/PB head
azimuth
MTT-114,
TCC-153
SCC-1727
10 kHz, -10dB
(A)
PLAY
Azimuth
adjustment
screw
In a setting wher the output
is maximized, adjust the
azimuth adjustment screw
so that the Lissajous figure
appearing on the oscilloscope
screen comes near to a line
slanted45°Note : The head
should be installed in such a
manner that it approaches the
tape face.
II. PC board adjustment
<1 >
Tape speed
MTT-111
TCC-100
SCC-1727
3 kHz, -4 dB
(A)
PLAY
SFR201
Adjust so that Frequency is
3 kHz at the center of the
tape.
<2 >
Playback level
TCC-120
315 Hz 0dB
(A)
PLAY
Approx. -5dBm
reference level
<3 >
Recording level
Put standard
test tape
(TCC-120)
into B deck.
Put standard
blank tape
into A deck.
(A)
Dubbing and
playback.
Approx. -5dBm
reference level
13
ADJUSTMENT
CASSETTE DECK SECTION
Oscilloscope
Frequency counter
AC voltmeter
{
PIN2
IC401
(A)
MAIN UNIT
INSTRUMENTS CONNECTION

RXD-251/301/351/371S/A3
14
ADJUSTMENT
CD MECHA.
UNIT
R07
VR01
VC
IC01
48pin
RF
R07A
R06
FIG.
(a)
No. ITEM INPUT
SETTINGS OUTPUT SETTINGS ALIGNMENT POINTS ALIGN FOR
PLAYER
SETTINGS
1 LASER POWER −Apply the sensor section of optical power meter
on the pickup lens. −
On the power from
0.08 to 0.15 mW,
when the diffraction
grating is correctly
aligned with the RF
level of 0.6 Vp-p or
more.
Press the
PLAY/PAUSE key.
Pickup
FOCUS ERROR
BIAS Test disc Type 4
Connect an oscilloscope
as follows.
CH1 : RF (R07A)
GND : VC (IC01, 48 pin)
FE BIAS
VR01 Optimum eye pattern
Press the
PLAY /PAUSE key.
Note:
Type 4 disc : SONY YEDS-18 Test Disc or equivalent.(KTD-0✽)
0.08 0.15 mW
Optical power meter
2
(a) Laser power ALIGNMENT POINT
CD SECTION

RXD-251/301/351/371S/A3
15
WIRING DIAGRAM
RXD-351(J,X1,X3,Y1,M1), RXD-A3(K1,P1),
RXD-251(X2,M3), RXD-371S(M2)
RXD-351E(E2), RXD-301W(Q2), RXD-351W(Q1)
RXD-301(E3,T2), RXD-351(E1,T1), RXD-301E(E4),
RXD-301E/351E
RXD-301W/351W
RXD-371S
RXD-351
RXD-301
RXD-A3
RXD-251
TUNER UNIT
TUNER UNIT
CASSETTE DECK
RECORD SWITCH
MOTOR
UNIT
SWITCH A
UNIT
SWITCH D
UNIT
SWITCH C
UNIT
CD MECHA.
UNIT
CD MECHA.
ASS'Y
HEADPHONE
MIC MIX UNIT
AUDIO UNIT
SUB WOOFER
PRE AMP
DISPLAY UNIT
UNIT
SENSOR
CD
CONTROL
UNIT
UNIT
UNIT
RXD-A3 TYPE
RXD-371S(M2)
RXD-351(M1,X1)/
RXD-301(X3)/
USED
UNIT
SWITCH B
TRANSFORMER
POWER
AC CORD UNIT
RXD-371S(M2)
RXD-351(M1)/
USED RXD-251(M3,X2)/
ONLY
MECHA. ASS'Y
CN101
CN101
AM
GND
FM 75
GND
JK101
CN08 CN402
FM 75
AM
GND
JK101
CN101
CN01 CN01
CN03 CN03
CN05
CN05
CN16CN16
CN06
CN06
CN18CN18
CN205
CN205
CN204 CN204
CN206 CN206
CN201
CN201
CN202
CN202
CN203
CN203
CN302
MIC1
MIC2
HEADPHONES
CN301 CN401
CN601CN601
CN604 CN604
CN403 CN403
CN302
CN502 CN502
CN605 CN605
JK601
SPEAKERS
Rch
Lch
OUT
JK501
Rch 2
Lch 1
AUX
JK401
CN701
GND
(MW/SW)
RXD-351
RXD-A3
RXD-251
RXD-371S
RXD-351
RXD-301E
RXD-351W
CN19 CN19
RXD-251
RXD-301
RXD-301W
RXD-301E
RXD-351
RXD-371S
RXD-A3
S701
CN701
RXD-A3 ONLY
RXD-351
RXD-301
RXD-A3
RXD-251
RXD-351W
RXD-351ERXD-371S
T/T
MOTOR
CN09
CN09
M
RXD-301W
RXD-301
RXD-351E
RXD-351E
RXD-351W
RXD-301W
RXD-301E
10
1
10
1
6
1
6
1
10
1
1
1515
1
66
11
15
33
11
51
15
15
22
11
1
1
8
8
6
1
6
1
4
1
4
1
31
31
51
51
21
21
31
1
17
1
17
33
11
3
1
3
1
1
4
1
4
13
5
1
5
1
6
1
6
1
1
6
CANADA
U.S.A. P1 K1
COUNTRY
DESTINATION
AUSTRALIA
GENERAL MARKET
JAPAN
PX M1
X3
J
Y1
ABB.
DESTINATION
COUNTRY ABB.
COUNTRY
DESTINATION ABB.
AUSTRALIA X2
GENERAL MARKET M3
GENERAL MARKET
DESTINATION
COUNTRY M2 ABB.
ABB.
U.K.
DESTINATION
COUNTRY
EUROPE T1 E1
DESTINATION
COUNTRY
EUROPE ABB. E4
DESTINATION
COUNTRY
RUSSIA ABB.
Q1
2
1
2
1
ABB.
X2
M3
AUSTRALIA
GENERAL MARKET
COUNTRY
DESTINATION
T2
E3
ABB.
U.K
EUROPE
DESTINATION
COUNTRY
AUSTRALIA X3
Q2
ABB.
RUSSIA
DESTINATION
COUNTRY
E4
ABB.
EUROPE
COUNTRY
DESTINATION
EUROPE E1
T1U.K
J
ABB.
JAPAN
COUNTRY
DESTINATION
AUSTRALIA
GENERAL MARKET
PX Y1
M1
X1
M2
ABB.COUNTRY
GENERAL MARKET
DESTINATION
P1
K1
ABB.
CANADA
U.S.A.
DESTINATION
COUNTRY
6
5
4
2
3
1
11
10
9
8
7
P9
T3
P5
P4 P8
P3
P2
P1
P6
P3
P1
F703
F702
P2
P7
P4
P6
P8
240V
220-
110-
120V
: AC100V 50/60Hz
: AC230V~ 50Hz
: AC240V~ 50Hz
: AC220V~ 50Hz
50/60Hz
: AC110-120V/220-240V~
: AC120V 60Hz
(Y,M)
P7
(T,E)
(X)
(Q)
(K,P)
T3
P5
P9
AC1
AC2
(J)
EUROPE
U.K.
GENERAL MARKET
PX
AUSTRALIA
E1
T1
X1
M1
Y1
ABB.
DESTINATION
COUNTRY
JAPAN J
ABB.
E3
T2
X3AUSTRALIA
COUNTRY
U.K.
EUROPE
DESTINATION
K1
P1
ABB.
CANADA
U.S.A.
DESTINATION
COUNTRY
ABB.COUNTRY
DESTINATION
M3
X2AUSTRALIA
GENERAL MARKET
Q1
ABB.
RUSSIA
COUNTRY
DESTINATION
ABB.
DESTINATION
COUNTRY
EUROPE E2
DESTINATION
COUNTRY ABB.
GENERAL MARKET M2
16
ED
118
18
1
AUSTRALIA X1
DESTINATION
COUNTRY
RUSSIA Q2
ABB.
ABB.
EUROPE
U.K.
DESTINATION
COUNTRY E3
T2
EUROPE E2
DESTINATION
COUNTRY ABB.
DESTINATION
COUNTRY
EUROPE ABB. E2
COUNTRY
DESTINATION
RUSSIA ABB.
Q1
DESTINATION
COUNTRY
RUSSIA ABB.
Q2
E4
ABB.COUNTRY
EUROPE
DESTINATION

RXD-251/301/351/371S/A3
16
PARTS DESCRIPTIONS

X201
CF105
C123
C122
J135
R130
C157
C118 C121 C147
J201
R123
C204
R205
R201
R114
R113
C114
C205
C117
J115
J143
J105
J104
C149
R118 C108
R204
R203
R108
R141
R106
R105
R107
L103
J117
C107
R112
C154
C116
R202
TC102
L104 L201
TC201
C148
C124 J118
C160 C126
C127
C138
J150
R132
R140
R122
C150 CF102
CF101
R149
J151
J149
C201 R208
CF103
R207 D201
Q201
Q202
Q205 Q204
D111
D112
C128 R145
C156
C135
C202
C206
R134
Q203
Q101
Q106
TC202
L106
C102
J144
L101
FE101
C103
G
J104
C106
D101
D108
D102
CF106
1
8 1
4
J108
J107 C101
R104
L102
R121
C137
R103
C203
R206
C139
C140 C165
C132 R128 C126 C133 R129 R127
R212
C131
R220
C141
C142
C125
R131
J193
C220
J175
R211
C130
C129
R119
R210
D202
J148 C210
C209
C152
C106A
C144
12
1
13 24
12
1
10
1
13
24
EB
EB
EB
EB
C153
C211
R133
TP1
T101
12
TP2
12
C151
C112
Q110
Q111
D110
J123
J138
J139
J145
B162
J147
J121
J120
J122 J119
J131
J129
J146
J192
J126
C161
C164
EB
E
C143
C215
E
BB
EB
J125
J130
J124
J113
L110
J111
L202
T102
L105
CF104
J176
J134
J133
J112
J110
J106
J142
JK101
J202
J116 J177
J140
J141
J190
L107
L108
C111
J191
R115
R213
J128 C213
C214
C212
R137
Q105
R214
C207
L203
C208
C145
J132
J127
R120
J136
R146
J185
CN101
Q108
Q107
Q109
IC201
IC102
E
B
E
B
E
B
G
S
D
E
B
17
Refer to the schematic diagram for the value of resistors and capacitors.
ACEBD
2
1
3
5
7
4
6
PC BOARD (Component side view)
R146
R130
J126
J136
J137
R122
C108
C149
R118
R161
R108
C109
C105
C106
C110
C111 L101
D106_1
R109
C103 J123
R111
R106
R107
J168
J165
R110 R101 J100
C150
R145
IC101
Q106
C102
TC102
R134
C116
R114
R113
C114
C171
C134 C138
R149
C126
R123
C147
C121
C160
C124
C157
C214
C213
C220
C137
CF105
C128
T102
C135
R102
D112 D111
1 9
C101
TC102
L102
R103 C104
TC101
J106 C107
C117
TC103
L105
C212
J139
C211
R132
J116
C144 C143
R133
C100B
C155
JK101
J101
R138
J164 C145
C166
C100A
C119 G
G
C112
R104 R112
C153 R214
C208
C210 C209
R140
R121
C129
14
C139
C140
R119
C127
CF103
R212
D202
R210 R211
J107
R105
X201
12
1
13 24
12
1
10
1
13
24
TP1
21
TP2
21
C161
C162
D110
J128 J155
J122
J184
J180
J178
C215
J153
J113
R220
J124
J118
J162
J171
J127
CF104
R213
J117
C165
C164
C151 R115 J177
L108
J157
L107
J115 J158
J114
J176
C130
C125
R131
C141
Q109
EB
T101
CF102
CF101
J109
J110
J108
C118
J111 J167 J179
C221
J175
C222
C223
R217
R218
C132
C133
R120
R129
R127
R128
R126
C122
C123
R216
C152
C131
EB
Q105
EB
EB
Q108
Q107
C207
C142
J131
J185
CN101
IC201
IC102
G
S
D
B
E
Q101
E
B
D105
Q102
D106_2
D101
D102
L103
L203
Q110
EB
Q111
EB
TUNER UNIT (K1P1Y1M1X1X2M3X3)
TUNER UNIT (E1T1Q1E2T2Q2E3E4)

C123
C122
J129 J128
R146
C157 C121
R123
C117R154
J135
R209
C203
R206
J136
J164
C202
J117 J154
R204 R157
R161
R118 C149
J137
C171
D105 J134
L106
C106
C102
C105
R109
R111
C110
R106 R107
C108 R108
R110 R101J100
C150 C100A R145
C109
IC101
C103 TC101
C111
R102
TC102
TC201
R100
L101
R201
C164
J181
C201
C218
J127
C124
R120
C160 C126
R149
C138
C214 C213
R122
CF102
CF101
C134
R207
C205
R160
J112
CF103
C118
C215
C137
C128
R203
C135
J182
L204
R113
C116
R162
1
9
C165
R208
R151
R202
R155
Q101
TC103 C107
R114
C166
C169
D108_1
C167 C112
C210
C209
R140
J168
C145
J165
R138
C153
C216
C212
C144
C143
R133
J180
C155 C100B
C211
J139
C217
R112
J166
R132
C101
L102
L201
L104
C119
JK101
C113
R134
R150
A
G
U
U
A
R103 J106
C104
R104
R105
J107
R121
CF105
14
R205
C204
C139
C140
R212
C170
R158
C151
J177
C130
C125
R115
L108
L107
C131 C152
R119 C129
J184
D202
R210
R211
C141
R131
C208
X201
R214
12
1
13
24
12
1
10
1
13
24
EB
EB
TP1
21
TP2
21
C162
C161
Q115
D110
J155 J156
J172
J178
R130
J125
J157
J158
J114
J113
J124
R213
R219 J122
J171 J162 J118
J191 J190
J115
C175
C174
EB
Q116
EB
Q109
EB
C127
T102
L105
T101
L202
TC202
CF104
J167
J153
J109
R153
R156
J111
J179
J110
C132 R128
R126
J126
R218
R217 R216
C133
J131
R129
R127
J123
C220
EB
Q113 EB
Q201
EB
Q105
Q112
EB
EB
Q204
EB
Q110
Q106
Q111
EB
Q114
EB
Q108
EB
Q107
Q202
E
B
Q102
E
B
Q100
E
B
Q203
D108_2
C207
C142
J132
J183
J185
CN101
IC201
IC102
GSD
E
B
D106_1
D106_2
D101
D102
L103
L203
L205
18
FGIHJ
2
1
3
5
7
4
6
Refer to the schematic diagram for the value of resistors and capacitors.
PC BOARD (Component side view)
TUNER UNIT : RXD-371S (M2)

Q418
Q403
IC401
D402
D714
D715
D502 D501
D505
D212 D211
D203
D213
D209
D201
D704
D705 D703 D702
D204
D503
D504
D706 D712
D581
D701
D202
D205
D585
D208
D206
D711
D707
D710
D709
D401
C488
C487 C431
C239
C527
JK502
C203
C205
C201
C217
C209
C223
C218
C245
C230
L201
C244
C231
C242
C232
C210
C213
C202 C240
C206
C204
C427
C489
C483
C421
C429
C423
C417 C415
C214
C224
C216
C703C704
C706 C705
C515
C530
C512
C543
C526
C525
C541
C511
C731
C711
C502
C503 C504
C505
C736
C722
C484
C405
C501
C730 C728 C723 C716
C712 C714
C426
C404C403
C430 C432 C420 C418
C414
C416 C428 C422
C718
C729
C720
C510
C506
C542
C507
C516
C520
C522
C514 C513
C215
C528
C233
C246 C235
C708
C709
C710
C707
C734
C741
C459C458
C482
C450
C460
C461
C453
C451
C481
C439
C452
C440
C402
C401
CN402
C419
C433
R421
GND
R419
R417
R461
R459
R457
R446
R447
R444
R485
4
1
8
1
R213A
R486
R487
R480
R321
R213
R211
R205A
R205
R229
R231
R202
R227
R228
R254 R230
R232 R206
R217
R218
R220
R233 R201
3
1
R206A
R263
R264
R241
R508
R484
R535
R536
R547
R545
R549
18
R527
C
P8 P7
P2 P4 P6
DC
D
E
F
F
E
A
A
B
B
R701
R706
R708
R705
R524 L501
L502
C509
R528
41 6
32
RL501
5
R523
R505
R700
P9
T3P5
P7
P1
P3
F702
F703
P6
P8
AC1
AC2
R502
B
E
R551
R543
R552
C508
C732
C701
C518
C517C531
R237
R257
R256
R249
R262
R242
R537
R538
R209
R255
R219
R268
R235
R455
R738
R481
R741
R422
R498
R497
R742
R437 R435
R439
R440
C434
C445
SW201
C721
C733
C435
14
1
87
C437
C454
C455
C413
C412
C438
C409
C448
C719
C715
C713
C724
CN605
61
CN206
1
L202
4
C447
E
B
Q703
E
B
Q706
E
B
Q503 Q502
Q414Q413
AUX
E
B
Q705
E
B
Q501
E
B
Q505
E
B
Q220
E
B
E
B
Q217
E
B
Q209
E
1
1
1
2
8
B
Q218
E
B
SFR201
Q216
Q508
E
B
Q512
E
B
Q511
E
B
Q207
E
B
Q201
PHONES
POWER
E
B
Q202
IC201
E
B
Q219
E
B
Q211
E
B
Q709
E
B
Q210
E
B
Q404
E
B
Q714
E
B
Q713
E
B
Q408
IC404
E
B
Q411
E
B
Q409
IC402
E
B
Q405
E
B
Q412
E
B
Q410
E
B
Q407
B
E
Q204 B
EQ206
5
CN202
E
Q203
B
B
EQ205
B
E
Q208 B
E
Q213
B
E
IC501
B
E
B
E
E
B
Q504 B
E
Q506
B
E
Q212
Q215
B
E
B
E
Q406 B
E
Q415
Q702
B
E
Q704
B
E
Q701
B
E
Q416 B
E
C410
C485
CN101
1
1
6
10
C408
C436
C411
C727
C523
C524
C532
C735
C529
C702
C519
C220 C219
1
6
C238
C241
C222
C225
C442
C449
C456
C462
C226
C463
C221
C208
C227 C237
C211
C207
C212
C228
C521
C446
C726
C441 C444
C464
C465
C407
C406
C725
C443
R406
JK401
SW751
R408
R436 R438 R434 R432 R430 R420
R426
R414 R410
R462 R458
R460
R451
R470 R494
R472
R467 R465
R212
R214
R221
R236
R270
R703
CN701
R715
R224
R226 R225
R259
R248
R244
R243
R247
R265 R238
CN205
1
8
CN205
1
6
CN204
R240
R258
R261 R260
R239
R267
R266
R541
R540
R542
R548
R544
R546
R525
R531
R512
R511 R513
R514
C234 C243
CN203
R515
R510
R707
R709 R713 R710
R504
R503
R506 R501
R529
R533
R507
R509
R704
D708
R702
R534
R530
R550
R532
R526
R539 R522
R517
C457
C480
C479
R269
R516
R519 R521
R711
R518
R712
R737
R520 R222
R234
R246 R245
R223
R250 R251
R215 R207
1213
24 1R203
CN201
R208 R204
R456
R449
R477
R479
CN403
5
1
17
1
CN502
CN301
5
1
CN502
R740 R739
R452 R453
R476
R474
R454
R478
R445
R322
R491
R469
R463
R473
R493
R475
R464
R471
R468
R492 R466
R450
R448
R412
R428
R416 R424
R418
R405 R407
R483
R482
R496 R495 R433
R431 R429
1516
30 1
R425 R423 R413
R404
R482 R490
R441 R442 R443
R402
R403
R401
R427 R415 R411 R409
J405
J406
J401
J402
J403
J450
J404
J461
J407
J408
J411
J410E
B
Q417
E
B
Q507
B
E
Q708
E
B
Q513
E
B
Q707
E
B
Q510
IC502
E
B
Q509
E
B
Q214
E
B
Q711
E
B
J418
J424
J520
J465C
14
1
4
1
J419 J455 J430
J546
J465D
J522
GND1
J531
J462
J517
S701
J516
J521
J514
J551
J202
J229
J231
C236
J227
J444
J423
J414
J465
J460
J449
J448
J447
J446
J445
J463
J222
J221
J220 J216
J205
J203
J234
J218
J219
J225
J210
J207
J523
J526
J544
J208
J528
J529
F701
J527
J501
J502
J550
J505
J506
J206
J504
J503
J415
J416
J465B
J541
J542 J543
J540
J539
J545
J452 J453
J437
J214A
J435
J434 J431
J433
J438
J432
J426
J456
J215
J217
J212
J518
JK501
J519
J536
J537
J538
J213
J204
D207
J232
J233
J209
J530
J510
J512
J436
J513
J511
J508
J509
J507 J524
J525
J228
J226
J532
J535
J224
J534
J535
J230
J214 J211
J429
J457
J428
J440 J441
J201
J465A
J439
J442
J443 J464
J427
J459
J422
J458
J425
J451
J454
J417
J420
J421
J413
J412 J409
GND4
KMOQSLNPRT
2
1
3
5
7
4
6
Refer to the schematic diagram for the value of resistors and capacitors.
PC BOARD (Component side view)
19 20
AUDIO UNIT
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UVXZABADWYAAAC
2
1
3
5
7
4
6
D604
Q602
D603
D602
VOLUME
CONTROL
D601
D607
AMS -
S624
AMS +
S619
D613
DISC SKIP
S618
TUNER DOWN
S616
S613
TUNER UP
AUTO PRESET
S611
S614
MANUAL PRESET
S607
FLATE
S605
POP
EX BASS
S615
Q604
S604
ROCK
AUTO/MONO
S617
TIME MODE
S610
IC601
S606
DISPLAY
S602
CLOCK SET
TIME SET
S601
FUNC IN
S609
POWER
S603
S612
BAND
S608
JAZZ
DISC 1
S621
DISC 2
S622
DISC 3
S620 S623
Q601
OPEN/CLOSE
S625
STOP PLAY/PAUSE
S626
R673
C628
CN604
1
3
R672 R674 R675 R676 R677
C609 R604
R603
E
B
R678 R671
CN601
CN601
C603
13
13
C608
C610
R605 C606
C611
R680
R619 R618
J670
J612
R629 R630 R631
J616
J623
R654
J629
R656
J 669
J642
R620
J653
J657 J658
CN302
J624
J621
R635 R636 R637
J666
J604 J603
J609 J608
J620
J618
J611 J610
J619
J622
J625
J648
LP601 LP602 LP603
J649
J668
J631
J626
J627
J607
J641
J637 J636 J633
J667
J605
J606
C604
C615 C616
J617
C614
R645
R616
J630
C601
R645
R643 R642 R641
C619 C620
R690
J680
C686 R683
R681
C685 R682
R689
R687
R685
R686 R688
C687
R692
R319
R326
CN403
R323 R317
R314 R308
R316 C321 R307
R305
C319
J301
R304 R303
R301
R328
JK302 JK301
R325
R302
R306
J302
C317
R324 R318
R684
J602
L601
R602 R601
C607
C605
C681 C628
18
CN605
1
1
17
6
C683
JK601
C684
C631
1
CN604
RM601
REMOTE
SENSOR
3
C622
C623
X601
100
31
50
81
51
80
30
1
C618
1
3
C629
E
B
Q611
IC602
E
B
Q301
Q302
Q303
IC301
MIC2 MIC1 PHONES
E
E
C316
C315
4
1
31 C314
E
71
CN302 B
B
B
Q603
E
J645
J646
J663
J652
J656
J650
J651
CN09
18
17 1
2
J659
VR601
MIC VOLUME
J655
J640 J639 J638
J635 J634
J643
J654
J662
J661
J665
J664
J632
J628
J660
J644
R622 CN401
AVR603
B
C
R621
C621
R320
R327
R315
C311
C313
C308
C306
C305
C301
C307
C309
A
C302
C320
R614
J647
LDC601
1 32
R615
R652
R646
R653
R608
R607
R655 ICT 1 2
J671
C613
R648
R647
J600
R632
R617
J601
C624
C617
C625 C626 C627
R628 R627 R626 R625 R624 R623 C632
R610
R609
C612
R651
R606 R650
R649
B
EB
B
B
Refer to the schematic diagram for the value of resistors and capacitors.
PC BOARD (Component side view)
DISPLAY UNIT
21 22
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