© 1999-10 PRINTED IN JAPAN
B51-7543-00 (N) 1446
CASSETTE RECEIVER
SERVICE MANUAL
KRC-408/488
MECHANISM EXTENSION CORD
W05-0477-00 (7P)
W05-0609-00 (10P)
SRC
PWR
OFF
LOUD
EJECT
A.ADJ
SCAN
B NR
B.S/RDM
REP
T.C/D.SCN
MTL/M.RDM
KRC-408
40W 4
X
CRSC
DISC
DISC
AUTO
AME
ADJ
CLK
CD MD-CHANGER CONTROL
PANEL ASSY
408 : (A64-1903-02)
488 : (A64-1906-02)
FRONT GLASS
408 : (B10-3134-01)
488 : (B10-3137-01)
ESCUTCHEON
(B07-2181-02)
CASSETTE LID
(A53-1683-13)
DC CORD
408:(E30-4783-05)
488:(E30-4784-05)
SCREW SET
(N99-1632-05)
SCREW SET
(N99-1610-15)
STAY
(J54-0606-04)
LEVER
(D10-3031-04)x2
MOUNTING HARDWARE ASSY
(J21-9491-03)
PLASTIC CABINET ASSY
(A02-1486-13)
KRC-408/488
2
BLOCK DIAGRAM
A1
SYSTEM
u-COM
IC1
DSI
KEY
P
ANEL
RST
SW
P
AN
5V
B
.U
.5V
MUTE
A
CC
DET
B
.U
.DET
ILLUMI
A
V
R
MUTE
DRIVER
PRE
MUTE
PO
WER
IC
IC6
EQ
AMP
DOLBY
E-V
OL
CD/MD
CHANGER
4ch
SP
OUT
WITH
LCD
DRIVER
LCD
MAIN
SUB
IC5
ON/OFF
IC2
IC4
SVR
SW
ANT
-CON
P
.ON
5V
REMO
TE
CONTR
OL
PRE
OUT
TEL-MUTE
ANT
-CON
P-CONT
AC
C
B.
U
.
KEY
MA
TRIX
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
A
UDIO
OUT
PLL
S
METER
S-METER
PLL
D
A
T
A
SUB+
SUB-
AC
C
B.
U
.
AMP
MUTE
SCK
PWR
STBY
SD
A
FM
+B
AM
+B
RST
P ANEL
ON/OFF
MUSIC
DOLBY
MET AL
LCDCLK
LCDCE
LCDD
A TA
OUT
LCDD
A TA
IN
DSI
FWD/REV
TMODE
P A
CKIN
MOTO
R
CHCON
DATA
H
DATA
C
REQH
REQC
CHCLK
OUT
Rch
COM
Lch
T
APE L/R
MET
AL
DOLBY
MUSIC
MPX
AM
OUT
RR
OUT
LR
OUT
RF
CD
L/R
LEVEL
SCK
SD
A
OUT
LF
T APE
L/R
CD
L/R
STBY
MUTE
Rch
Lch
PA
C
K
T
-END
STBY
MODE
FWD
REV
B
.U
.5V
COM+B
B
.U
.14V
SMUTE
168mV 162mV
E:190mV
KM:360mV
(AM)
(FM)
8
1200mV
E:1100mV
KM:1600mV
(T
APE)1708mV
(FM)
(CD-CH)3635mV
615mV
830mV
(AM)
780mV
570mV
(CD-CH)3495mV
(AM)
(FM)
KM:1500mV E:1060mV
(T
APE)1642mV
5
10
IN
HD1
FM+B
AM+B
COM+B
B
.U
.5V
PLL
CLK
SUB
M
OTO
R
MP
IN
SVR
PHONE
ILL
ON
B.
U
.5
V
CHMUTE
P
.ON
5V
REMOTE
341mV
SVR
Ref
.102
Ref
.103
Ref
.95
Ref
.105
Ref
.94
M2
M1
8V
A
V
R
Q84,85
COM+B
FM+B
AM+B
Q93
Q92
P-CON
KRC-408/488
(X14-) IC1 : SYSTEM u-COM
PORT NAME
I/O
FUNCTION
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
Stand-by output to power amp
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
--
-
37 DSI
O
Disable System Indicator
38 EQ MUTE
O
Tape equaliser mute output
39 P.ON
O
Power on
40 -
-
-
3
CIRCUIT DE
SCRIPTION
PORT
No.
34-
36
(X14-) IC1 : SYSTEM u-COM
PORT NAME
I/O
FUNCTION
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
--
-
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
--
-
73 VDD
-
VDD
74 AM IN
-
GND
75 FM IN
-
GND
76 VSS
-
GND
--
-
79 TEST1
-
GND
80 XOUT
I
Clock output
PORT
No.
77,
78
71,
72
57-
60
KRC-408/488
4
BALANCE/FADER/BASS/TREBLE:CENTER
T.ADV/METAL/DOLBY NR/AUTO:OFF
ADJUSTMENT
No.
ITEM
INPUT
SETTINGS
OUTPUT
SETTINGS
RECEIVER
SETTINGS
ALIGNMENT
POINTS
ALIGN FOR
FIG.
CASSETTE DECK SECTION
1
AZIMUTH
TCC-153
10KHz
SP OUT
TAPE PLAY
Head azimuth
screw
(FWD/REV)
(ME1)
Adjust so that output
level in playing "FWD"
and "REV" becomes
maximum each.
(b)
2
DOLBY
(PLAY BACK
LEVEL)
TCC-130
Connect an
AC voltmeter
to CN5
(X14-)
TAPE PLAY
VR1(L ch)
VR2(R ch)
(x14-)
300mV
(c)
VR1
F/E
R
G
L
(Lch)
AC voltmeter
(C)300mV
VR2
(Rch)
(b) AZIMUTH
FRONT
FWD
REV
CN5
(DOLBY)
A
B
C
D
E
F
G
H
I
J
1
2
3
4
5
6
7
5
6
C7
C6
C2
C5
R19
R18
R12
R13
R14
R22
C1
C4
R11
R3
R16
R17
C3
R2
R1
R4
R6
R7
R5
C8
BE
1
16
17
32
33
48
49
64
1
15
14
2
IC1
Q1
D24
D25
D26
43
1
2
VOL.
UP
DOWN
VOL.
ATT
RST
1
2
3
4
5
6
AUTO
CLK
AM
FM
SRC
AUD
EJECT
X13-9670-10
D1
D4
D5
D6
D7
D8
D9
D10
D12
D13
D2
D3
D11
D14
D16
D15
IC2
D17
D22
D21
1
24
25
38
PC BOARD (COMPONENT SIDE VIEW)
Refer to the schematic diagram for the values of resistors and capacitors.
IC
Q
address
14A
22B
14A
R40
R46
R104
R122
R258
R39
R47
R24
R27
R123
R45
R338
R14
W2
R23
R22
R21
W1
C122
C102
C101
TH1
R48
R54
R124
R177
C43
R412
R55
R3
R4
C2
R2
C1
R1
R58
C104
C59
R13 R11
R182
C131
R179
R178
R12
R413
R50
C125
R196
R156
R52
C337
C336
C56
R62
R157
R51
C61
R71
R90
C132
R187
R419
C57
C81
R70
C66
R186
C111
R341
C105
R101
R106
R107
R143
R102
R256
R42
R129
R340
R339
R105
W3
R103
R336
R59
R53
B
E
B
E
B
E
EB
E
B
E
B
B
E
B
E
B
E
B
E
B
E
Q88
Q96
D5
D4
D3
Q83
Q85
D7
D1
Q87
Q119
Q118
Q91
Q82
Q81
Q89
D84
CMP
L
G
LR
DOLBY
R
(4.50)
L1
W26
C80
L7
W35
W30
W17
W18
W13
W21
W20
W37
C46
C18
C17
W34
C16
C15
W12
W25
W33
W32
W31
W29
R29
C110
L3
L2
C65
C86
C88
C203
C12
VR2
R337
C11
W28
W36
W22
W27
C48
R175
C8
R77
W15
W14
W23
R65
C170
W24
R26
W38
C45
VR1
L6
C124
X1
C208
C3
C123
C126
C4
C47
L5
C83
C205
X86
C82
C7
C13
C67
C127
C55
C204
C128
C84
R63
R64
C85
C202
C212
1
5
7
6
10
9
2
3
4
8
12
13 11
1
9
16
8
1
25
2
24
1
13
23
1
10
1
2
1
2
15
14
1
7
R191
R255
W5
R404
R418
R416
R180
R407
R406
R405
R417
CP4
C87
R192
R411
R408
R410
R409
C193
R30
R28
R8
R6
R257
R5
R44
R38
R37
R43
R41
R250
R36
R35
R33
R34
R125
C211
R127
CP2
CP3
CP1
C194
C195
C68
C6
R10
R251
R119
R120
R121
C54
R25
C5
R7
R9
R135
R195
R193
R184
R149
R176
R194
R415
C133
C69
C70
R67
R153
R154
C19
C20
R185
R207
R61
R114
R414
R126
R60
R56
R57
C60
R253
R142
R146
R145
28
15
14
1
17
8
14
1
10
11
20
21
30
31
40
1
5
6
10
1
24
25
40
41
60
61
80
B
E
E
B
E
B
B
E
E
E
B
E
B
B
B
E
E
B
E
B
B
E
B
E
B
E
B
E
BE
E
B
B
B
E
EB
E
E
B
B
B
E B
E
E
E
B
X14-6160-XX
D16
CN1
D17
D85
D332
D81
J4
Q94
Q336
D20
Q92
D86
J6
D408
D411
Q117
D333
Q80
J2
CN2
D83
CN5
D90
D19
D21
IC4
Q93
J3
D80
D18
J5
D82
CN4
J1
PRE OUT
IC2
Q41
D403
D6
Q44
Q95
IC6
IC1
Q97
Q43
Q42
Q116
IC7
Q335
Q90
IC5
Q201
Q121
Q103
D8
Q101
Q86
Q84
Q337
Q105
Q104
D11
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
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