KENWOOD KRC-408 Service Manual
CASSETTE RECEIVER
KRC-408/488
SERVICE MANUAL
PANEL ASSY
408 : (A64-1903-02)
488 : (A64-1906-02)
CASSETTE LID
(A53-1683-13)
© 1999-10 PRINTED IN JAPAN
B51-7543-00 (N) 1446
MECHANISM EXTENSION CORD
W05-0477-00 (7P)
W05-0609-00 (10P)
408 : (B10-3134-01)
488 : (B10-3137-01)
DC CORD
408:(E30-4783-05)
488:(E30-4784-05)
KRC-408
LOUD
FRONT GLASS
LEVER
(D10-3031-04)x2
CD MD-CHANGER CONTROL
SCANB NR B.S/RDM REP
EJECT A.ADJ
X
40W 4
T.C/D.SCN
MTL/M.RDM
AUTO
AME
ESCUTCHEON
(B07-2181-02)
MOUNTING HARDWARE ASSY
(J21-9491-03)
SRC
PWR
OFF
DISC
CLK
ADJ
DISC
PLASTIC CABINET ASSY
(A02-1486-13)
CRSC
SCREW SET
(N99-1632-05)
SCREW SET
(N99-1610-15)
STAY
(J54-0606-04)
KRC-408/488
A1
SYSTEM u-COM
IC1
DSI
KEY
PANEL
RST SW
PAN 5V
B.U. 5V
MUTE
ACC DET
B.U. DET
ILLUMI AVR
MUTE DRIVER
PRE MUTE
POWER IC
IC6
EQ AMP
DOLBY
E-VOL
CD/MD
CHANGER
4ch
SP OUT
WITH
LCD DRIVER
LCD
MAINSUB
IC5
ON/OFF
IC2
IC4
SVR SW
ANT-CON
P.ON 5V
REMOTE CONTROL
PRE OUT
TEL-MUTE
ANT-CON
P-CONT
ACC
B.U.
KEY MATRIX
MM
J4
Q201
IC7
Q121
Q87-89
Q80,81
Q101
Q118
Q94-96
Q116,117
J5/6
J2
Q41-44
Q104
IC2
IC1
Q105
J1
ANT
FM ANT
AM ANT
AUDIO OUT
PLL
S METERS-METER
PLL DATA
SUB+
SUB-
ACC
B.U.
AMP MUTE
SCK
PWR STBY
SDA
FM +B
AM +B
RST
PANEL ON/OFF
MUSIC
DOLBY
METAL
LCD CLK
LCD CE
LCD DATA OUT
LCD DATA IN
DSI
FWD/REV
T MODE
PACK IN
MOTOR
CH CON
DATA H
DATA C
REQ H
REQ C
CH CLK
OUT
Rch
COM
Lch
TAPE
L/R
METAL
DOLBY
MUSIC
MPX
AM
OUT RR
OUT LR
OUT RF
CD L/R
LEVEL
SCK
SDA
OUT LF
TAPE L/R
CD L/R
STBY
MUTE
Rch
Lch
PACK
T-END
STBY
MODE
FWD
REV
B.U. 5V
COM+B
B.U. 14V
S MUTE
168mV
162mV
E:190mV
KM:360mV
(AM)
(FM)
8
1200mV
E:1100mV
KM:1600mV
(TAPE)1708mV
(FM)
(CD-CH)3635mV
615mV
830mV
(AM)
780mV
570mV
(CD-CH)3495mV
(AM)(FM)
KM:1500mV
E:1060mV
(TAPE)1642mV
5
10
IN
HD1
FM+B
AM+B
COM+B
B.U. 5V
PLL CLK
SUB
MOTOR
MP IN
SVR
PHONE
ILL ON
B.U. 5V
CH MUTE
P.ON 5V
REMOTE
341mV
SVR
Ref.102
Ref.103
Ref.95
Ref.105
Ref.94
M2 M1
8V AVR
Q84,85
COM+B
FM+B
AM+B
Q93
Q92
P-CON
BLOCK DIAGRAM
2
KRC-408/488
CIRCUIT DESCRIPTION
(X14-) IC1 : SYSTEM u-COM
PORT
PORT NAME
No.
1 XIN I Clock input
2 TEST 2 - GND
3 LCD DATA IN I LCD driver data input
4 LCD DATA OUT O LCD driver data output
5 LCD CLK O LCD driver clock output
6 STBY I Tape stand-by SW
7 T END I Tape end SW
8 SDA 2 I/O Data line to E-VOL.
9 SCL 2 O Clock line to E-VOL.
10 REQ H O Changer request output
11 DATA C I Changer data input
12 DATA H O Changer data output
13 CH CLK I Changer clock input
14 REQ C I Changer request input
15 CH CON O Changer control
16 LCD CE O LCD driver Chip Enable output
17 AM+B O AM power supply control
18 FM+B O FM power supply control
19 MUTE O Mute output for audio circuit
20 ILLUMI O Illumination on
21 AMP STBY O
22 SVR O SVR discharge circuit control
23 P.CON O Power control
24 ANT CONT O Tuner ANT control
25 SUB+ O Sub motor+output
26 SUB- O Sub motor-output
27 - - -
28 SEL 2 I Destination discrimination 2
29 SEL 1 I Destination discrimination 1
30 SEL 0 I Destination discrimination 0
31 VDD - VDD
32 N.CAN I Noise canceller setting
33 MOTOR O Motor-ON output
34-
---
36
37 DSI O Disable System Indicator
38 EQ MUTE O Tape equaliser mute output
39 P.ON O Power on
40 - - -
I/O
Stand-by output to power amp
FUNCTION
(X14-) IC1 : SYSTEM u-COM
PORT
PORT NAME
No.
41 - - -
42 MS CONT O -
43 - - -
44 BEEP O Beep output(2.08KHz)
45 PANEL I Panel ON/OFF detection
46 AMP MUTE O Mute
47 CRSC I -
48 PACK IN I Pack-in detection
49 FWD/REV I Tape FWD/REV
50 SDA3 O PLL/EEPROM data line
51 SCL3 O PLL/EEPROM clock line
52 METAL O Metal mode ON/OFF
53 DOLBY O Dolby
54 AM IF CONT I AM IF count judgement
55 SD I SD input
56 REMOTE I Remote controller
57-
---
60
61 T MODE I Mode pulse input
62 PHONE I Telephone mute input
63 ACC I ACC detection
64 BACK UP I Back Up detection
65 MUSIC I Tape signal detection
66 S-METER I FM band SD detection
67 HOLD I Hold Detection
68 SNS I -
69 LCTR - GND
70 HCTR - GND
71,
---
72
73 VDD - VDD
74 AM IN - GND
75 FM IN - GND
76 VSS - GND
77,
---
78
79 TEST1 - GND
80 XOUT I Clock output
I/O
FUNCTION
3
KRC-408/488
BALANCE/FADER/BASS/TREBLE:CENTER
T.ADV/METAL/DOLBY NR/AUTO:OFF
ADJUSTMENT
No. ITEM
INPUT
SETTINGS
CASSETTE DECK SECTION
1 AZIMUTH
DOLBY
(PLAY BACK
2
LEVEL)
TCC-153
10KHz
TCC-130
OUTPUT
SETTINGS
SP OUT TAPE PLAY
Connect an
AC voltmeter
to CN5
(X14-)
RECEIVER
SETTINGS
TAPE PLAY
ALIGNMENT
POINTS
Head azimuth
screw
(FWD/REV)
(ME1)
VR1(L ch)
VR2(R ch)
(x14-)
ALIGN FOR FIG.
Adjust so that output
level in playing “FWD”
and “REV” becomes
maximum each.
300mV (c)
(b)
(b) AZIMUTH
FWD
FRONT
REV
CN5
(DOLBY)
GL
VR2
(Rch)
VR1
(Lch)
F/E
R
(C)300mV
AC voltmeter
4
A B C D E F G H I J
PC BOARD (COMPONENT SIDE VIEW)
1
2
X13-9670-10
VOL.
DOWN
D1
ATT
RST
1
D4
R2
2
D5
D22
R22
C7
R1
D2
R16
VOL.
D3
UP
R17
43
IC2
D26
1
C3
12
X14-6160-XX
D408
D411
3
C80
R336
D81
R337
B
E
D403
W3
R25
R70
Q336
Q335
3
D6
17 32
16
IC1
4
15
D7
D24
5
6
1
1
D8
R3
64
D25
R11
AUTO
D10
CLK
R12
D9
R13
D11
C4
C2
C1
C5
R19
R18
R14
14
2
R4
R6
AM
4
5
6
24
33
48
25
49
Q1
BE
IC Q
address
14A
22B
14A
38
D12
EJECT
D21
C6
D15
FM
D16
D14
D13
AUD
R5
R7
C8
D17
SRC
7
R26
121311
Q117
C81
CN2
D333
J4
R404
C13
C12
B
E
R71
E
B
Q116
7
1
D83
E
B
EB
Q88
R407
R415
Q94
Q80
Q81
R77
R22
C11
D4
B
E
B
E
C82
W2
2348
R405
R412
R413
Q89
B
E
1576109
BE
R406
D5
C86
C83
R23
R408
R21
D3
D80
R414
Q87
R410
D20
R177
C122
E
Q95
B
C87
C110
R340
BE
8
R409
R29
W35
R411
R24
R27
EBEB
Q96
D82
R338
C104
Q86
R175
C88
R30
R145
R106
R142
R107
R339
R341
E
B
R114
D8
R185
W34
D86
Q97
R63
R416
J2
D17
E
B
C105
D84
W33
R64
D11
W32
D85
EB
(4.50)
X1
Q337
R184
W28
R28
R417
Q105
R176
W31
B
Q85
R418
916
1
D16
W30
W29
W27
W26
C85
E
BE
Q82
C102C101
1
R419
24
25 40
R126
R125
EB
R119
Q84
R60
R124
W24
R179
R178
R182
Q118
R62
C111
R120
L1
C131
BE
R61
D21
IC1
R121
W23
W38
W22
W25
W1
W36
W37
D19
17
R146
6180
60
R143
R101
R102
R123
R105
R104
CP1
41
IC7
W18
C84
Q83
R127
W17
BE
CP4
CP2
CP3
TH1
1
814
2
C204
C132
R187
R56
R149
C133
R180
R103
C60
W5
R154
Q101
D18
R186
R129
R57
Q104
E
BE
W21
W20
Q103
BE
B
L5
R153
R135
IC4
R250
W15
R251
C127
W14
R65
Q201
C65
D6
R207
R253
24
25
C170
W13
C48
EB
C46
C47
C67
R258
28 15
EB
Q121
C20
C126
C124
C54
C19
C68
R192
R51
R255
R50
C125
C128
D332
W12
IC2
C59
11
20
C55
C45
C66
R34
R36
C203
R257
R191
10
21
R35
C15
C195
R58
IC5
C57
R33
C205
C202
Q119
R67
R10
R52
R9
D7
BE
30
141
C70
C194
C193
1
40
31
C56
15
R256
Q42
R8
R4
C5
14
R48
Q44
B
E
R42
C211
C69
CMP
R3
R5
R7
R53
1
5
C16
C6
C61
R38
B
C17
R6
IC6
R157
R37
R44
E
R40
E
R46
L3
C3
R59
J6
Q41
B
R90
C4
R156
PRE OUT
R43
E
R41
R39
B
Q43
R45
C18
C212
R2
R1
C123
R54
R55
C337
C336
10
6
J3
R47
C2
C1
R195
R193
R196
R194
L2
CN1
10
J5
Q92
E
EB
Q93
D90
CN5
1
C8
R14
VR2
R
VR1
L
C7
2
1
C43
L6
B
E
Q90
BE
B
Q91
C208
DOLBY
GLR
13
R12
R11
R13
D1
R122
23
1
CN4
J1
L7
X86
IC Q
address
16E
24G
41F
55H
66H
74F
41 3H
42 3H
43 3H
44 3H
80 4C
81 4C
82 5E
83 5F
84 5E
85 5E
86 6D
87 6D
88 6D
89 6C
90 3H
91 3H
92 3H
1
2
93 4H
94 4C
95 4D
96 4D
97 4D
101 5F
103 5F
104 6F
105 7E
116 4C
117 4C
118 4E
119 4G
121 4G
201 3G
335 6C
336 6C
337 6D
Refer to the schematic diagram for the values of resistors and capacitors.
5
6
K L M N O P Q R S T
1
R6
R4
C6
2
C8
R7
R5
R13
15
R3
R11
R12
14
R14
64
1
49
R18
R19
C2
C4
C1
C5
BE
48
16
17
33
32
R16
R2
C7
R17
C3
R1
R22
D25
D24
IC1
Q1
D26
AM
FM
CLK
AUTO
SRC
AUD
6
5
4
EJECT
3
2
1
RST
21
34
ATT
DOWN
VOL.
VOL.
UP
D11
D14
D16
D10
D15
D21
D17
D13
D9
D7
D8
D12
D6
D5
D4
D22
IC2
X13-9670-10
D1
D2
D3
38
25
24
1
1
2
3
4
5
6
7
PC BOARD (FOIL SIDE VIEW)
address
X86
IC Q
14L
22K
14L
Refer to the schematic diagram for the values of resistors and capacitors.
J1
L7
CN4
1
2
X14-6160-XX
PRE OUT
R154
B
Q101
D18
R186
R129
R103
C133
E
R57
E
C204
C132
R187
R180
W5
C60
TH1
CP2
CP3
1
W17
CP4
R127
R56
R149
Q83
BE
W18
IC7
R143
R101
R102
CP1
W38
W22
W25
W24
W23
1
D16
L1
W1
W29
W30
W36
W37
W27
W26
D19
148
R179
R178
R182
17
C131
EB
C85
Q118
C84
R62
R61
D21
R146
61
60
C111
R60
Q84
BE
Q82
80
BE
Q85
C102C101
1
IC1
R418
R123
R105
R104
41
40
R121
R120
R124
R119
R417
R419
24
25
R126
R125
EB
IC4
24 2
25
R195
R194
1
10
R41
Q43
R54
C336
R47
E
B
C18
C212
C2
R2
R1
C1
R55
C337
10
J6
R43
R37
Q41
E
R45
R90
C123
R156
J3
R38
B
R39
C17
L3
C4
C3
IC6
E
R59
Q44
B
R46
C16
C211
CMP
R6
R157
R44
B
R40
E
R5
R7
C61
R256
R48
Q42
C69
R8
C6
C56
1
56
C205
C202
R42
15
14
C70
C194
C193
40
R3
31
C5
R53
14
D7
Q119
R4
R10
1
30
R52
15
R9
R257
EB
R58
IC5
C55
R33
C203
R67
R35
C45
C15
C66
C195
10
21
C57
R34
R36
IC2
R192
R191
C68
11
20
W12
W13
C48
C47
C59
C54
R51
D332
C46
C19
C126
C170
28
1
C20
C124
C128
C67
E
B
Q121
R50
Q201
R255
C125
EB
R258
C65
D6
R207
R253
C127
R65
R135
R250
W14
R251
Q103
W21
W20
W15
L5
R153
EB
Q104
B
J5
C43
D1
L6
Q92
E
B
E
Q90
1
B
BE
Q91
R193
R196
E
B
Q93
R12
1
R14
C7
L
C8
VR2
VR1
R
D90
CN5
L
1
L2
CN1
2
C208
DOLBY
R3G
23
R11 R13
R122
R176
W31
W28
R28
BE
R184
D11
D84
W32
Q105
J2
W33
R64
(4.50)
X1
R341
C105
R416
D85
D86
E
B
Q97
Q337
R185
W35
W34
R175
D17
R24
R27
C88
B
R63
D82
R145
R142
R107 R338
E
R106
C104
B
R339
Q86
B
E
R114
D8
R411
E
R30
R340
169
8
D20
R177
C122
Q95
Q96
C83
C110
R409
C87
R414
Q87
R410
D3
R29
D80
B
W2
23481213
R406
R408
R21
R23
C13
C11
D5
E
C86
B
C82
R412
R413
Q89
BE
E
D4
R415
Q94
Q80
E
B
B
E
R405
B
E
R77
Q88
J4
R407
R22
C12
BE
CN2
610715
R404
Q117
B
E
Q81
R71
Q116
E
B
7
1
D83
BE
11
9
D408
D411
D403
R26
R70
C81
D333
Q335
W3
R25
D81
Q336
R337
B
E
C80
R336
IC Q
address
16Q
24O
41P
55O
66N
74Q
41 3N
42 3O
43 3N
44 3O
80 5S
81 5S
82 5Q
83 5P
84 5Q
85 5R
86 6R
87 6R
88 6S
89 6S
90 3N
91 4N
92 3N
93 4N
94 4S
95 4R
96 4R
97 4R
101 5P
103 5P
104 6P
115 7R
116 5S
117 4S
118 4Q
119 4O
121 4P
201 3P
335 6S
336 6S
337 6R
13 14
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