Kenwood KRC-4902Y User manual

©2002-1 PRINTED IN JAPAN
B51-7880-00 (N)1089
CASSETTE RECEIVER
KRC-4902Y
SERVICE MANUAL
Mounting hardware assy
(J21-9641-13)
Antenna adaptor
(T90-0523-05)
Lever
(D10-4589-04) DC cord (E30-4792-05)
Plastic cabinet assy
(A02-1486-13)
LOUD SCRL SCAN REP M.RDMT.CALLB.S/RDM MENU AMEAUTOCLK
KRC-4902
SRC
OFF
45Wx4
WIDE BAND
DISC
AUD
Front glass
(B10-4129-01)
Knob(1-6)
(K25-1392-03)
Knob(SRC)
(K24-3820-04)
Knob(FM,AM)
(K25-1393-03)
Knob(VOL)
(K25-1395-03) Cassette lid
(A53-1687-03)
Panel assy
(A64-2540-02)
Knob(AUD)
(K24-3821-04)
MECHANISM EXTENSION CORD
W05-0477-00 (7P)
W05-0609-00 (10P)
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TEL [phone] QQ 376315150 892498299 TEL [phone] QQ 376315150 892498299

KRC-4902Y 2
BLOCK DIAGRAM
FM ANT
AM ANT
RF GND
FM+B
AM+B
AM LO/DX
FM LO/DX
IF SELECT
RDS OUT
FM SD OUT
REQUEST
K2I-VTH
VCO-GND
FSD OUT
FM DET OUT
AM DET OUT
IF GND
COMMON+B
P-ON 5V
DIG GND
PLL DATA
PLL CLK
PLL CE
HI UP ADJ
FM+B
AM+B
A8V
SW5V
LO/DX
SD
S-METER
PLL-DATA
PLL-CE
SW5V
ACC-DET
BU-DET
SCL
MUTE
SDA
EN1
EN2
EN3
PANEL
RESET
DSI
CH MUTE
NOISE
DATA H
DATA C
REQ H REQ C
CH RST
CH CON
CH CLK
Rch
COM
Lch TAPE L/R
MP IN
AFS
QUAL
AM
MPX
OUT RR
OUT LR
OUT RF
LEVEL
SCL
SW5V
SDA
SCL
SDA
OUT LF
STBY
MUTE
SMUTE
5
10
BU5V
AFS
R QUAL
R CLK
R DATA
BU5V
REMO
SW5V
GREEN
RED
BU5V
PHONE
BEEP
SVR
P-MUTE
P-STBY
SVR
AC GND(BEEP)
TAPE L/R
PLL-CLK
L-RES
L-CLK
L-DATA S
L-DATA L
MUSIC
EQ-MUTE
MS-CONT
MUSIC
EQ-MUTE
MS-CONT
FWD/REV
PACK IN
M-STBY
T-MODE
T-END
L-CE
340mV
SUB+
SUB-
Rch
Lch
PACK
T-END
M-STBY
T-MODE
FWD
REV
AUDIO
8V
MOTOR
BU14V
SW5V
IN
PLAY HEAD
SW5V
BU14V
BU5V
BU14V
EN1
EN2
EN3
P,CON
ILLUM
B.U.5V
AM+B
AUDIO
FM+BFM+B
AM+B
AUDIO 8V
AUDIO 8V
AUDIO 8V
BU5V
SW5V
TAPE
CD-CH
AM
FM
: 1719mV
: 3424mV
: 550mV
: 1727mV
TAPE
CD-CH
AM
FM
: 1786mV
: 3546mV
: 850mV
: 1345mV
AM : 160mV
FM : 213mV
CD L/R
1200mV BU14V CD L/R
8
ANT.
SYSTEM u-COM
KEY
PAN 5V
MUTE
E2PROM
EQ AMP
CD ISO AMP
E-VOL
LCD DRIVER
LCD
DSI
REMO RST SWPAN IN SW
GREEN
RED or
RST IC
TEL DET TEL MUTE
DRIVER
MAIN
SUB
AVR
SW5
B.U. DET
SURGE-DET
B.U.
ACC
P-CONT
DC CONNECTOR
REGULATOR
ACC DET
J2
VOLTAGE
MUTE
PRE
R-Lch
R-Rch
AMP
SVR
MUTE
THERMO
PROTECTION
FRONT Lch
FRONT Rch
REAR Lch
REAR Rch
IC4
J4
POWER IC
TDA7386
CD/MD
CHANGER
SP OUT
J5
PRE OUT
IC10
SUB MOTOR
DRIVER
MOTOR
DRIVER
IC1
IC2
IC12
IC9
IC2
IC1
IC11
IC7
IC8
Q2,3
TUNER
(X16)
(X14)
MM
TAPE MECHA
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TEL [phone] QQ 376315150 892498299 TEL [phone] QQ 376315150 892498299

KRC-4902Y
3
● SYNTHESIZER UNIT (X14-6892-72)
COMPONENTS DESCRIPTION
Ref.No. Function Operation
IC1 SYSTEM µ-COM
IC2 E-VOLUME
IC4 POWER AMPLIFIER Speaker output
IC7 POWER IC
IC8 MUTE CONTROL LOGIC 3 input NOR gate x 3
IC9 EQUALIZER AMPLIFIER For full logical cassette mechanism control
IC10 SUB MOTOR DRIVER For full logical cassette mechanism sub motor driver
IC11 RESET IC Detection voltage below 3.0V
IC12 EEPROM
Q1 P.CON.DETECTION Detects P.CON voltage.
Q10 BACK-UP DETECTION Detects the back-up voltage.
Q11 SERGE DETECTION Detects serge voltage.
Q20 ACC DETECTION Detects ACC voltage.
Q40 PREOUT MUTE DRIVER Mutes when the base terminal voltage level becomes "L".
Q50 5V SW Works when the base terminal voltage level becomes "L".
Q101 DSI SW LED for DSI works when the base terminal voltage level becomes "H".
Q151 PANEL 5V SW Works when the base terminal voltage level becomes "L". Supplies VDD to panel.
Q221-224 PREOUT MUTE Mutes when the base terminal voltage level becomes "H".
Q251 POWER IC SVR SW Discharges the capacitor's voltage of SVR terminal after the base terminal voltage becomes "H".
Q301 LOCAL SEEK SW Changes to the local seeking after the base terminal voltage becomes "H".
Q501 MOTOR DRIVER AVR Works when the base terminal voltage becomes "H". Supplies the power to the motor driver.
Q551 MAIN MOTOR SW Works when the base terminal voltage becomes "L".
Q552 MAIN MOTOR SW Works when the base terminal voltage becomes "H".
IC1 LCD DRIVER
IC2 REMOTE SENSOR
Q1 KEY SCAN SW Receives key signal when the base terminal voltage becomes "L".
Q2 KEY ILLUMINATION SW Key illumination color becomes green when the base terminal voltage becomes "H".
Q3 KEY ILLUMINATION SW Key illumination color becomes red when the base terminal voltage becomes "H".
● SWITCH UNIT (X16-1532-71)
Ref.No. Function Operation
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TEL [phone] QQ 376315150 892498299 TEL [phone] QQ 376315150 892498299

KRC-4902Y
4
● µ-COM (IC1 : X14-)
Pin No. Pin name I/O Description Processing Operation
1 DSI O DSI control.
2 PANEL I Panel detection. "L": Panel exists.
3- --
4 AVSS - GND.
5 L-RST O LCD driver reset.
6 L-CE O LCD driver chip enable.
7 AVREF1 I Reference voltage
8- --
9 PLL-DATA I/O Front-end communication data.
10 PLL-CLK O Front-end communication clock.
11 L-DATA L I LCD driver communication data.
12 L-DATA S O LCD driver communication data.
13 L-CLK O LCD driver communication clock.
14 R-DATA I RDS data.
15 R-QUAL I RDS QUAL.
16 CH-DATA C I Changer communication data.
17 CH-DATA H O Changer communication data.
18 CH-CLK I/O Changer communication clock.
19 M-STBY I Cassette tape stand-by detection. "H": Stand-by.
20 T-END I Tape end detection. "H": Run. "L": Stop.
21 ACC-DET I ACC detection.
22 BU-DET I Back-up detection.
23 IC2 TYPE 0 I For service. "L": Normally.
24 IC2 TYPE 1 I For service. "L": Normally.
25 TYPE 0 I Destination discrimination.
26 TYPE 1 I Destination discrimination.
27 TYPE REF O Reference voltage for destination and service.
28 MOTOR O Cassette mechanism motor. "H": ON. "L": OFF.
29 PLL-CE O Front-end communication chip enable.
30 SD I Station detection. "H": Station exists. "L": Station does not exist.
31 ASF O Noise detection time constant switch.
32 LO/DX O Local seeking switch. "H": LO. "L": DX.
33 VSS1 - GND.
34 P-MUTE O Power amplifier muting.
35 SVR O SVR control.
36 - - -
37 IC2-SCL O E-volume communication clock.
38 IC2-SDA I/O E-volume communication data.
39 MUTE O Muting control.
40 P-STBY O Power amplifier stand-by.
41 P.CON-DET I P.CON short-circuited detection.
42 CH-CONT O Changer control.
43 - - -
44 CH-REC H O Changer request.
45-47 - - -
48 EN2-1 O Power supply IC control.
MICROCOMPUTER'S TERMINAL DESCRIPTION
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TEL [phone] QQ 376315150 892498299 TEL [phone] QQ 376315150 892498299

5
KRC-4902Y
Pin No. Pin name I/O Description
Processing Operation
49 EN2-0 O Power supply IC control.
50 BEEP O Buzzer.
51 EN3 O Power supply IC control.
52 EN1 O Power supply IC control.
53 SW 5V O P.ON 5V control. "H": OFF. "L": ON.
54 MUSIC I Tape signal detection. "H": Signal does not exist. "L": Signal exist.
55 MS-CONT O Tape advanced sensitivity control. "H": Play. "L": FF/REW.
56 EQ-MUTE O Cassette tape muting. "H": ON. "L": OFF.
57 FWD/REV I Cassette tape running direction detection. "H": FWD "L": REV.
58 SUB+ O Sub motor control.
59 SUB- O Sub motor control.
60 RESET I System reset.
61 REMOTE I Remote control.
62 R-CLK I RDS clock.
63 CH-REQ C I Changer request.
64 PACK-IN I Cassette tape pack-in detection.
65 KEY-REQ I Key signal detection.
66 - - -
67 VSS0 - GND.
68 VDD1 - VDD.
69 X2 - Main system clock.
70 X1 I Main system clock.
71 IC - -
72 - - -
73 XT1 - VDD.
74 VDD0 - VDD.
75 AVREF 0 I Reference voltage.
76 S-METER I SD detection. "H": SD exists. "L": SD does not exist.
77 T-MODE I Cassette tape mode detection.
78 PHONE I Navi mute: Over 2.5V. Tel mute: less than 2.5V.
79 NOISE I Noise detection during FM mode.
80 AV CONT O Reference voltage.
MICROCOMPUTER'S TERMINAL DESCRIPTION
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TEL [phone] QQ 376315150 892498299 TEL [phone] QQ 376315150 892498299

FIG.
6
KRC-4902Y
TEST MODE / ADJUSTMENT
1. How to enter the test mode
• Reset the unit while holding the "FM" key and preset "6"
key.
• All indication segments go ON at the beginning of the test
mode.
2. How to release the test mode
• Simply reset the unit.
• (NOTE) The test mode should not released in conditions of
ACC OFF, power OFF, momentary power down or the
panel off.
3. Test mode
• Blanking Skip (B.S) OFF.
• Eject a tape by pressing "ATT" key.
4. Audio adjustment
• Enter the audio mode by pressing the "AUD" key or
"OPEN/CLOSE" key on the remote controller.
• Set the volume level to be -10dB. In that case, "30" should
be shown on the display.
• Loudness OFF.
• The BASS/MIDDLE/TREBLE and BALANCE/FADER can
be adjusted to the full-boost/full-cut and full-front/ full-rear
each by pressing the "UP" and "DOWN" keys.
5. Menu mode
• Enter the menu mode by pressing "CLK" key or "DNPP"
key on the remote controller.
• Only on models with RDS function, Local Seeking should
be first menu.
BALANCE/FADER/BASS/TREBLE : CENTER
T.ADV/METAL/DOLBY NR/AUTO : OFF
TEST MODE
ADJUSTMENT
(b) AZIMUTH
PANEL FRONT
FWD REV
ITEM INPUT
SETTINGS OUTPUT SETTINGS RECIEVER SETTINGS ALIGNMENT POINTS
No.
AZIMUTH TCC-153
10kHz SP OUT TAPE PLAY
Head azimuth
screw
(FWD/REV)
(ME1)
ALIGN FOR
Adjust so that output level in
playing "FWD"and "REV"
becomes maximum each. (b)1
CASSETTE DECK SECTION
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TEL [phone] QQ 376315150 892498299 TEL [phone] QQ 376315150 892498299

ABCDEFGHIJ
1
2
3
4
5
6
7
78
PC BOARD (COMPONENT SIDE VIEW)
Refer to the schematic diagram for the values of resistors and capacitors.
DTC
DTH
CLK
TEST
RES
5V
GND
W21
W23
C304
W2
W19
W5
R303
W24
R222
R143
W1
W17
W18
W20
W13
R161
W14
W16
W7
W22
W15
W8
W12
R229
W25
W4
W3
R232
R230
W11 W10
W9 W6
R160
R231
R158 R159
R409
R410
R407
R157
R21
R30
R1
R2
R155
R156
R153
R154
R408
R411 R406 R401
R537
R551
R404
R501
R405
R354
R402
R403
R552
R20
X1
X2
L201 C222
C401
C402
C221
C224
C255
C258
C257
C203
C223
C403
C201
C256
C253
C252
C251
C254
R221
R224
R223
L301
C1
L304
L303
L101
L306
L305
C509
C513
C507
C353
C505
C514
C518
C517
C351
C55
C306
C54
C50
C51
C52
C301
C53
C56
C101
C501
L1
R304
R305
R162
R102
R103
R10
R31
C531
C1
R14
118
125
224 9106 75 1
13 11 3812 4 2
12
12
13
1
24
7
1
BE
110
2
1
14
15
WH1
J2
CN2
CN1
P1
D251
D253
D252
D101
D40
D2
D551
D4
D3
D411
D410
D409
D401
D404
D403
D402
D1
Q551
D30
D20
D10
IC4
J5J6
D161
D157
D160
D159
D153
J4
A1
IC7
J3
D407
D154
D11
X14-6892-72 (J74-1321-02)
AUD
FM
AM
TI
56
RST CLK
6
5
4
3
2
1
23
4
1
VOL
SRC
ATT
KI1
KS2
KS3
1
KI4
KS4
KS5 KS3 KI5
KI2
D14
IC2
D6
D5
D8
D7
D2
D1
D4
D3
D9
D12
D10
D11
D20
ED1
D22
D21
D13
X16-1532-71 (74-1303-02)
Ref. No. address
X14-6892-72
Ref. No. address
IC2 2I
X16-1532-71
SYNTHESIZER UNIT SWITCH UNIT
IC4 2D
IC7 4G
Q551 5C
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TEL [phone] QQ 376315150 892498299 TEL [phone] QQ 376315150 892498299

KLMNOPQRST
1
2
3
4
5
6
7
910
PC BOARD (FOIL SIDE VIEW)
Refer to the schematic diagram for the values of resistors and capacitors.
BE
EBEB BE
EB
BE
BE
BE
EB
EB
EB
BE
BE
EB
BE
BE
R132
R141
R228
R227
R226
R225
R258
C533 C534
C202
R262
R142
R113 R114
R112
C206
C105
R255
R257
R201
C207
R140
R122
R138
R123
R129
R261
R260
R137
R117
R118 R115
R116
R135
R136
R120
R202
R513
R512
R511
R514
R517
R516
R515
R504
R414
R413
R412
R415
R503
R502
C20
R518
C14
R536
R535
R556
R554
R534
R521
R520
R519
R522
R533
R531
C104
R251
C102
C103
R205
R204
R203
R252
C30
C40
R254
R253
R259
R111
C511
C508
C506
C516
C515
C512
C502
C354
C211
C210
C404
C356
C355
C307
C308
C302
C303
C305
C225
C532
C352
R101
R32
R50
R51
R104
R108
R109
R110
R105
R106
R107
R11
R12
R22
R23
C208
C209
R263
R256
C205 C204
R3
C2
R353
CP315
CP102
CP104
CP101
R145 CP103
R144
C106
R146
R15
R16
R4
C260
C259
TH1
141
28 15
14
58
17
814
18
916
40
1
10 11
20
21
30
31
B
E21
43
610
15
80 1
20
21
40
41
60
61
IC2
Q251
Q223
Q501
Q224
IC10
IC6
Q222
Q221
Q552
Q40
Q301
Q101
Q20
Q10
Q201
Q151
D301
Q50
IC1
IC8
IC11
IC9
IC12
Q1
D102
Q11
X14-6892-72 (J74-1321-02)
DTC
DTH
CLK
TEST
RES
5V
GND
W21
W23
C304
W2
W19
W5
R303
W24
R222
R143
W1
W17
W18
W20
W13
R161
W14
W16
W7
W22
W15
W8
W12
R229
W25
W4
W3
R232
R230
W11 W10
W9
W6
R160
R231
R158
R159
R409
R410
R407
R157
R21
R30
R1
R2
R155
R156
R153
R154
R408
R411
R406
R401
R537
R551
R404
R501
R405
R354
R402
R403
R552
R20
X1
X2
L201
C222
C401
C402
C221
C224
C255
C258 C257
C203
C223
C403
C201
C256
C253
C252
C251
C254
R221
R224
R223 L301
C1
L304
L303
L101
L306
L305
C509
C513
C507
C353
C505
C514
C518
C517
C351
C55
C306
C54
C50
C51
C52
C301
C53
C56
C101
C501
L1
R304
R305
R162
R102
R103
R10
R31
C531
C1
R14
118
1
25
2
24
9106751 1311381242
1
2
12 13
1
24
7
1
BE
110
2
1
14
15
WH1
J2
CN2
CN1
P1
D251
D253
D252
D101
D40
D2
D551
D4
D3
D411
D410
D409
D401
D404
D403
D402
D1
Q551
D30
D20
D10
IC4
J5 J6
D161
D157
D160
D159
D153
J4
A1
IC7
J3
D407
D154
D11
B
E
EB
B
E
KI2
KI3
KI4
KI5
KS2
KS3
RES R16
R15
R18
R17
C5
R13
R14
R10
R9
R3
R4
R1
R2
R7
R8
R5 R6
C3
C1 C2
C4
R12 R11
R20
C6
C8
R23
R19
R22
C7
14 15
1
2
64
65
80
1
24
25 40 41
LGND
REMO
SW5V
DATAL
L-CE
PAN5V
DGND
KS4
WL+B
LRES
KS5
KI1
L-CLK
DATAS
Q3
Q2
Q1
D18
D17
D19
J1
IC1
X16-1532-71 (74-1303-02)
Ref. No. address
IC1 6P
IC2 4Q
IC4 2Q
IC7 4N
IC8 5P
IC9 5O
IC10 6O
IC11 6P
IC12 4Q
Q1 3R
Q10 4Q
Q11 3R
Q20 5R
Q40 3N
Q50 5P
Q101 6P
Q151 6S
Q223 3N
Q224 3O
Q251 3Q
Q501 6O
Q551 5R
Q552 5R
X14-6892-72
Ref. No. address
IC1 4L
Q1 4L
Q2 3L
Q3 3L
X16-1532-71
SWITCH UNIT SYNTHESIZER UNIT
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4 2
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TEL [phone] QQ 376315150 892498299 TEL [phone] QQ 376315150 892498299

ABCDEFGHIJ
1
2
3
4
5
6
7
J4
CN1
D401
D402
D404
D403
D409
D411
D410
DET.
ACC
D10
D11
Q11Q10
DET.
SERGE
DET.
BACK-UP
Q40
Q501
EQUALIZER
AMPLIFIER
SUB MOTOR
DRIVER
Q552
Q551
E-VOLUME
CN2
MOTOR
D551
AVR
MOTOR DRIVER
HEADRch
Lch
MAIN
T-END
STBY
SUB
PACK
FWD/REV
M
HD1
M
M1M2
PLAY
IC1 :
IC2 : TDA7407D
IC4 :
IC9 : HA12221F
IC7 : TDA3682ST
IC8 : HD74HC27FP
Q1 : DTC124EUA or
Q10,11,20,101
2SD1819A
Q40 : DTA124EUA or
Q50 : 2SA1036K
Q223,224 : DTC143TUA or
Q251 : DTC114YUA or
Q501 : 2SD1760
Q551 : 2SB1443
Q552 : DTC114EUA or
D1 : S2V20 A
D2,3 : 1GWJ43 (TPB5)
D4,551 : AM01Z or
D10,11,401,402
: MA4068 (N) -M
D20 : MA4051 (N) -M
D40,101,251-253
: B30-1567-05
403,404,407,409-411
: 1SS133 MUTE DRIVER
PREOUT
J2
D40
D20
Q20
D1
D2
D3D4
D30
DRIVE
MUTE
IC12
IC10
IC11 LB1930M S-80835ANNP
: BR24C01AF
:
:
Q151 DTA114YUA or:
MA4047-M or:D30
D102
MA4062-L or:
D153,154,157,159-161,
B-PART
A-PART
TDA7386
UPD780058GC426
2SC4081 or:
UN5112
UN5114
UN5216
UN5214
UN5211
1N5393G-M6 or
ERA15-01
HZS5B1
HZS6C1
D407
TEL
MUTE
B LINE
GND LINE
SIGNAL LINE
UN5212
CH-IN
DC-IN/SP-OUT
22K
22K
10K
10K
3.6V
0V
0V
5V
0V
8.3V
4.1V
4.1V
4.1V
4.1V
0V
0V
4.1V
4.1V
4.1V
4.1V
4.1V
4.2V
3.8V
3.8V
3.8V
3.8V
0V
5V
5V
0V
5V
1V 8.0V
4.0V
4.0V
3.8V
3.8V
3.8V
3.8V
3.8V
3.8V
3.8V
3.8V
0V
3.8V
7.7V
5.0V
5.0V
0V 0V
7.6V
7.6V
0V
5V
0V
5V
0V
0V
5V
0V
5V
5V
0V
5.0V
0V 4.1V
4.9V
0V
3.8V
IC2
IC9
IC10
IC8
CASSETTE MECHANISM
(D40-1150-05)
SYNTHESIZER UNIT (X14-6892-72)
(E30-4792-05)
DC1
DATA C
GND
REQ H
CON
MUTE
S GND
Rch
RST
2
4
3
812
7
6
11
10
159
DATA H
Lch
CLK
REQ C
13
R404 100
R405 4.7K R406 4.7K
R402 10
R403 4.7
R407 4.7K R409 4.7K R408 4.7K
R411 100 R410 100
R401 10
C403 100u10
+
C402 1u50
+
C401 1u50
+
13
1
3
2
4
5
L GREF VREF CD R R PH-
6
7
8
CD GND CD L
10
9
11
12
AFS MPX AM LEVEL MP IN
28
AC OUT L
OUT RL
OUT FR
OUT FL
AC OUT R 26
27 25 24
GND
VDD
OUT RR 23
21 22
QUAL
S MUTE
SCL
SDA 19
20 18 17
MP OUT
14 16
15
MUX OUT L
MUX OUT R
FR
RR
RL
FL
5
7
6
30 29 28 27 26 25 24 23 22 21
20
19
18
17
16
15
14
13
12
11
1
2
3
4
5 6
7
8 9
10
31
32
33
34
35
36
37
38
39
40
M-OUT (R)
EQ OUT (R)
D IN (R)
RAI (R)
PB OUT (R)
MS GV (S)
MS GV (R)
MA OUT
MSI
MS DET
VCC
MUSIC
S/R (MSGV)
F/R
MTL
M-OUT (L) RQ OUT (L) D IN (L) RAI (L) PB OUT (L) MUTE
NFI (R)
R IN (R)
RIP
F IN (R)
F IN (L)
V REF
R IN (L)
NFI (L)
1
2
3
4
5
6
7
8
9
10
MODE
MODE+B
SUB(-)
SUB(+)
PACK IN
F/R
GND
HEAD L
HEAD COM
HEAD R
9
71u50
+
C509
B.U.
42
44
16
63
18
17
5
4
3
2
1
SGND
IN2
IN1
NC
VCC
6
7
8
9
10
PGND
OUT2
NC
OUT1
NC
470
0.01
330K 5.1K
0.1u50
+
22u6.3
+
C514
150
R514
0.01
330K 5.1K
+
R513
150 C513 22u6.3
+
C517 0.1u50
15K
1500P
R533 470C532 0.01
R534 100K
470
54
55
47u10
C501
+
0.01
C502
56
180K
R502
0.22u50
C505
+
C506
4.7
R501
57
64
3.3K
R20
R32 22K
10K
R30
C30 0.01
1/2W
10K
R11
1000P
C14
R14
82K
56K
R15
100K
R16
30K
R10
R415 100K
C404 0.01
VDD
GND
1
2
14
13
312
11
4
5
6
7
10
9
8
C40 0.01
77
59
58
0.01
C508
24K
R504
0.47u50
C507
+
1.6K
R503
10u10
+
22
R537
C533C534
9
7
37
38
5
7 6
2.2u50
+
0.01
C202
47u10
+
C201
4.7uH
L201
C203
C206 0.015
C207 0.47
R201 2.7K R202 4.7K
R551 10K
STBY
T-END
GND
GND
4
6
7
5
2
3
1
M+B
R552
1K
20
19
R556 470
R554 470
1/2W
C205 1
C204 1
4.7K
R203
C209 0.1
C208 0.1
C211 150P
C210 0.033
10
9
6
8
7
5
4
1
3
2
HEAD R
HEAD COM
HEAD L
GND
F/R
PACK IN
SUB(+)
SUB(-)
MODE+B
MODE
MODE
FWD/REV
PACK
M+R
GND
T-END
STBY
GND
R413 100K
R414 100K
R412 100K
1234567 8 910 1112131415161718
B.U B.U B.U GND GND GND T.MUTE P.CON ACC A.5 RR- RR+ RL- RL+ FL- FL+ FR+ FR-
L1
C20 0.01
R22 47K
47K
R21
R12 100K R23 100K
78
21
22
R31 47K RR-
RR+
RL-
FR+
FR-
RL+
FL-
FL+
3300u16
+
4.7K
C1
R535
R536
22K
R531
4.3K
C515
R517 R519
12K
R515
C512
R512 15K
1500P
C511
R511
R520R518
C516 12K R516
4.3K
R522
R521
9
11
13 10
R2
7
9
9
7
39
C518
3
1
2
7
4
5
6
7B 531
6248
REAR. L
FRONT. L FRONT. R
REAR. R
P.CONT OUT
ACC
ANT.CONT
8
75
64
31
2
BATT
A
RED
BLU/WHT BLK YEL
GRN
WHT
GRY
VIOL
GRN/BLK
WHT/BLK
GRY/BLK
VIOL/BLK
0.22 0.22
C531
0.01
4.7K
R1
+B
+B +B
+2V
+5V
+B
+B
+B
+B
+B
+5V
+5V
+B
+5V
+B+B +B
+5V
+5V
+B
+B28
+2V
+2V
MUT RST
MT
+8V
+8V
+8V
+8V
CAUTION : For continued safety, replace
safety critical components only with
manufacturer's recommended parts (refer to
parts list).
Indicates safety critical components. To
reduce the risk of electric shock, leakage-
current or resistance measurements shall be
carried out (exposed parts are acceptably
insulated from the supply circuit) before the
appliance is returned to the customer.
• DC voltages are as measured with a high
impedance voltmeter. Values may vary slightly
due to variations between individual
instruments or/and units.
!
w w w . x i a o y u 1 6 3 . c o m
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7
6 3
1 5 1 5
0 9 9
2
8 9
4 2
9 8
T E L 1 3 9 4 2 2 9 6 5 1 3 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3
Q Q
TEL [phone] QQ 376315150 892498299 TEL [phone] QQ 376315150 892498299

KLMNOPQRST
D251
D252
D253
Q224Q223
PRE OUT
J5
J3
Q151
SYSTEM
u-COM
5V SW
POWER
AMPLIFER
Q251
D157
D161
D153 D159
PANEL
5V SW
MUTE
PREOUT
IC SVR
D160
SW
Q101
D102
EEPRON
DSI
Q50
RESET
D101
Q1
P.CON.
DETECTION
2/2
X16-
J1
(E30-4933-05)
ANT
WH1
D154
POWER
POWER
SUPPLY
LR
4.7K 4.7K
47K
10K
47K
10K
22K
22K
0V
7.3V
7.3V
7.3V
7.3V
7.2V
0V
4.7V
14.4V
7.3V
7.2V
7.2V
0V
14.4V
3.3V
0V
7.3V
7.2V
0V
0V
5V
0V
0V 5.0V
0V
5.0V
0V
0V
5V
0V
5V
0V
0V
5V
5V
0V
5.0V
5V
0V
5V
0V
5V
0V 5V
0V
5V
0V
0V
5V
0V
5V
4.3V
0V
5V
0V
5V
0V
0V
0V
0V
5.0V
5V
0V
5V
0V
0V
5V
0V
5V
5V
0V
0V
5V
5V
0V
5V
0V
0V
0V
5V
5V
0V
0V
5V
5V
0V 5V
0V
5V
0V
5V
0V
5V
0V
0V
5V
5V
0V
0V
5V
5V
0V
REV : 0V
FWD : 5.0V
0V
5V
0V
5V
5V
0V
5V
0V
0V
5.0V
0V
5.0V
5V
0V
4V
0V
1V 2.5V 1.6V
0V
5V
0V
5V
0V0V0V
5.0V
5.1V
14.1V
10.4V
5V
0V
0V
8.0V
8.3V
0V
13.8V
14.4V
8.3V
5V
2.5V
IC4
A1
KRC-4902Y (1/2)
IC1
IC12
IC11
A
IC7
2 4 6 8 10 12 14 16 18 20 22 24
GND
STBY
VCC
GND
SVR
IN2
IN4
GND GND
VCC
MUTE
GND
1
3 5
7
9
11
13 15
17
19
21
23 25
TAB OUT2- OUT2+ OUT1- OUT1+ IN1 GND IN3
OUT3+ OUT3- OUT4+
OUT4- CD
4.7K 4.7K
C255 1u50
+
C256 100u10
+
R256
R255 33K
1K
R254
R252
0.22u50
C254
0.22u50
C251
RL
RR
RR-
FR+
FR-
RR+
RL+
FL-
FL+
RL-
+
1u50
+
8.2K
R257
R260
750R261
430
35
TH1
R258 100
R259 22K
R262
180K
270
R224 R232
100 100
R231R223
270 10u16
C223
R227
30K R228 30K
10u16
C224
+C225
C258
R251
4.7K
C252
0.22u50
4.7K
0.22u50
C253 R253
RR
RL
RR
FR
RL
FL
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
RF GND
FM ANT
AM ANT
FM+B
AM+B
FM LO/DX
K2I-VTH
VCO-GND
FM SD OUT
FSD OUT
FM DET OUT
AM DET OUT
COMMON+B
IF GND
HI UP ADJ
PLL CE
PLL DATA
PLL CLK
P-ON 5V
DIG GND
IF SELECT
REQUEST
RDS OUT
52mH
L301
10
11
8
+
100u10
C304
0.01
C305
13
30
R305
3.3
1
2
3
4
56
7
8
9
10
11
12
13
14
15
ILL GND
D GND
L RST
SW5V
LAMP +B
LED +B
L DATA S
L CLK
L CE
L DATA L
VDD
RST
REMO
PANEL SW
ESD GND
R153 1K
R161 1K
R154 1K
R158 470
R156 1K
R157 1K
R159 1K
R162 47
12
2
61
6
11
13
34
50
C257 1u50
+
Q251
40
47K
R263
R160 100
5
P1
R155 10
0.01
C303
0.01
C302
100u10
C301
+
4.7uH
L303
L304 4.7uH
12
R303
R304 4.7
10
4.7uH
L305
29
L306
4.7uH
C306
10u16
0.01
+
C307
AM LO/DX
CP101 1K
80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
21
22
23
24
25 26
27
28 29 30
31
32
33
34
35 36
37
38 39 40
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
AV CONT
NOISE
PHONE
T-MODE
S-METER
AV REF 0
VDD 0
XT1
XT2
IC
X1
X2
VDD 1
VSS 0
KEY-REQ
PACK-IN
CH-REQ C
R-CLK
REMO
RESET
SUB-
SUB+
FWD/REV
EQ-MUTE
MS-CONT
MUSIC
SW5V
EN1
EN3
BEEP
EN2-0
EN2-1
CH-REQ H
CH-CONT
P.CON-DET
ACC-DET BU-DET IC2 TYPE 0 IC2 TYPE 1 TYPE 0 TYPE REF MOTOR PLL-CE SD AFS LO/DX VSS 1 P-MUTE SVR GND
IC2-SCL IC2-SDA
MUTE P-STBY
DSI
PANEL
AVSS
L-RST
L-CE
AVREF1
PLL-DATA
PLL-CLK
L-DATA L
L-DATA S
L-CLK
R-DATA
R-QUAL
CH-DATA C
CH-DATA H
CH-CLK
M-STBY
T-END
9
CP104
1K
R132 1K
78
4.7K
R142
58
59
57
56
55
54
52
51
48
50
R145
10K
44
42
R144
4.7K
CP102 1K
CP103 10K
22K
R123
1
2
3
4VSS
8
7
6
5
VCC
WP
SCL
SDA
4.7uH
L101
2
5
6
10
82.2K
R102
2.2K
R103
11
R104
100K
12
13
R105 2.2K
R106 2.2K
16
17
18
20
19
R122 10K
R120 10K
37
38
240
R143
160K
4700P
22K
R141
X1
6.8K
R138
C105
15P
C104 15P
4.19MHz
R135
2.2K
R136
2.2M
61
R137 4.7K
28
40
39
35
34
21
22
47K
R51
2.2K
R50
29
30 R116 4.7K
R115 2.2K R117 4.7K
R107 47K
R109 47K
R113 47K
R112 47K
TYPE 1
C106
R140
2 1
3
4
100K
0.1
C101 100u6.3
+
C102 0.01
63
C103
R101
C2
120K
R3
100K
R4
4.7K
R129
0.01
+5V
+5V
+5V
+5V
+B
+B
+B
+B
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
MT
MUT
RST
0.01
77
64
RST
RST VCC
52
C52
10u16
C51
10u16
+
10u16
VP1
+
+5V +BU.5V
13
C55
+C56
100u16
11 ILLUM
12
EN1
10
AUDIO GND
8 9
AM+B
7
10u35
+
C50 1
51
48 P.ANT
FM+B EN3
4
5 6
P.CON EN2
2
3
10u50
C54
10u16
+
C53
+10.4V
+10.4V
+10.4V+10.4V
+8V
+8V
+8V +8V
+8V
+8V
+8V +8V
+8V
+8V
+8V
+8V
+5V
+B
+B
+5V
+B
DTC114YU
A
DTC143TU
A
UN5111
UN5114
UN5211
UN5214
UN5216
2SA1036K
2SD1760 2SB1443
2SC4081 DTA114EUA
DTA124EUA
DTC114EUA
DTC124EUA
DTA114YUA UN5212
BR24CO1AF
BR24CO1AF-W LB1930M
w w w . x i a o y u 1 6 3 . c o m
Q Q
3
7
6 3
1 5 1 5
0 9 9
2
8 9
4 2
9 8
T E L 1 3 9 4 2 2 9 6 5 1 3 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3
Q Q
TEL [phone] QQ 376315150 892498299 TEL [phone] QQ 376315150 892498299