Kenwood KRC-208S/218 User manual

CASSETTE RECEIVER
KRC-208S/218
SERVICE MANUAL © 2000-1 PRINTED IN KOREA
B51-7586-00 (K) 1787
KRC-268/288
KRC-28MR
KRC-28MR (K)
PLASTIC CABINET ASSY
(A02-1486-13) LEVER
(D10-3031-04) x2 MOUNTING HARDWARE ASSY
(J21-9491-03)
DC CORD
(E30-xxxx-xx)
(Refer to the parts list.)
CD/MD-CHANGER CONTROL KRC-208S
CD/MD-CHANGER CONTROL KRC-28MR
KRC-268
KRC-208S (K) KRC-218 (K)
KRC-268 (M)
STAY
(J54-0606-04)
SCREW SET
(N99-1610-15)
(Except KRC-28MR)
SCREW SET
(N99-1632-05)
KRC-218
CD/MD-CHANGER CONTROL KRC-288
KRC-288 (M)
AUD
123456
CLK
ATT
SRC
PWR
OFF
AME ADJAUTO
SCAN RDM REP T.C/D.SCN M.RDM
LOUD
DISC
CRSC
A.ADJ
FM
AM
FF REW
PR OG
AUD
123456
CLK
ATT
SRC
PWR
OFF
AME ADJAUTO
SCAN RDM REP T.C/D.SCN M.RDM
LOUD
DISC
CRSC
A.ADJ
FM
AM
FF REW
PR OG
AUD
123456
CLK
ATT
SRC
PWR
OFF
AME ADJAUTO
T.CALL
LOUD
CRSC
A.ADJ
FM
AM
FF REW
PR OG
AUD
123456
CLK
ATT
SRC
PWR
OFF
AME ADJAUTO
T.CALL
LOUD
CRSC
A.ADJ
FM
AM
FF REW
PR OG
AUD
123456
CLK
ATT
SRC
PWR
OFF
AME ADJAUTO
SCAN RDM REP T.C/D.SCN M.RDM
LOUD
DISC
CRSC
A.ADJ
FM
AM
FF REW
PR OG
40%
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

KRC-208S/218,268/288,28MR
2
BLOCK DIAGRAM
IC1
KEY
PANEL 5V SW
MUTE
B.U. DET. B.U.
ACC
P-CONT.
MUTE
PRE
POWER IC
EQ. AMP.
CH ISO AMP
NC/MPX
E-VOL.
CD/MD
CHANGER
FRONT Lch
FRONT Rch
REAR Lch
REAR Rch
J2
LCD DRIVER
LCD
ME1
MAIN
TAPE MECHA.
IC5
1 Lch
2 Rch
PRE OUT
IC2
IC4
IC3
SP OUT
REAR
J4
RESET SW
PAN IN SW
ANT-CONT.
P-CONT.
J2
J5
IC1
FRONT-END
J1
FM+B
Q201
AM+B
Q203
AM BPF
FM BPF
C154,157,R206
C153,156,R207
Q320
Q450,451
Q370,371
Q50
Q350-353
Q353
P-CON.SW
Q54-57
COM+B
Q58-61
ILLUMI.
B.U.5V
Q51,52
SYSTEM u-COM
S1
S2
S3
P-CONT.
CHANGER
RST SW
Q301
D1-15
PL1,2
ANT.
ANT-CONT.
FM ANT
AM ANT
RF GND
FM+B
AM+B
OSC GND
OSC GND
OSC GND
VT
PLL +B
IFC OUT
SDA
SCL
DIG GND
IF1+B
IF1 GND
S-METER
IF2 GND
SD
FM+B
SW5V
ACC DET
B.U. DET
SCL
MUTE
SDA
P. CON
PANEL HOLD L CLK L DATA S L DATA L FWD/REV MOTOR
CH CON
DATA H DATA C
REQ H REQ C
CH CLK
Rch
COM
Lch
TAPE
MP IN
AM
MPX
OUT RR
OUT LR
OUT RF
Rch
LEVEL
SCL
SDA
OUT LF
Rch
STBY
MUTE
Rch
Lch
T-MUTE
FWD
REV
B.U.5V
8V
B.U.
CHRST
S MUTE
8
4
10
B.U.5V
AM+B
VDD 5V
PACK IN L CE
ANT CON
CHMUTE
BEEP
SVR
AMP. STBY
SVR
AC GND (BEEP)
Lch Lch
Rch Lch
1200mV
TAPE :1681mV
CD/MD-CH :3529mV
AM :546mV
FM :1781mV
8V
RF GND
OSC GND
IF2 +B
AUDIO OUT
8V
S-METER
SD
PLL CLK
PLL DATA
M1
HD1
R55.6mV
BU5V
SW5V
8V
B.U.5V
AM: 170mV
FM: 400mV
L
PACK IN
(FF/REW)
AMP. MUTE
FF/REW
BU5V
ILL
(X13)
M
KRC-208S/218,268/288,28MR (K/K,M/M,K)
A1
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

3
KRC-208S/218,268/288,28MR
COMPONENT DESCRIPTION
SYNTHESIZER UNIT (X14-614x-xx)
REF. No.
FUNCTION OPERATION
IC1 SYSTEM µ-COM Controls system.
IC2 ELECTRIC VOLUME Controls sound volume. Selects each source.
IC3 MUTE Controls each mute output.
IC4 POWER IC Amplifies power so that the speaker can drive audio signal.
IC5 EQUALIZER AMPLIFIER Equalizer amplifier for cassette tape sound.
Q50 BACK-UP DETECTION Stops when the back-up voltage comes less than 9.2V.
Q51,52 BACK-UP 5V AVR Works when the back-up works.
Q53 P.ON DRIVER Works when the power comes.
Q54,55 COM+B SW Works when 5V comes.
Q56,57 COM+B AVR Works when Q54 and Q55 work.
Q58,59 ILLUMINATION +B SW Works when the base level of Q58 comes "H".
Q60,61 ILLUMINATION +B AVR Works when Q58 and Q59 work.
Q150 ELECTRIC VOLUME MUTE SW Works when the base level comes "H".
Q151 SVR DISCHARGE SW Works when the base level comes "H".
Q153 PRE MUTE DRIVER Works when the base level comes "L".
Q200 FM +B SW Works when the base level comes "H" in FM mode.
Q201 FM +B DRIVER Works when Q200 works.
Q202 AM +B SW Works when the base level comes "H" in AM mode.
Q203 AM +B DRIVER Works when Q203 works.
Q260 MOTOR +B SW Works when the base level comes "H" in the tape mode.
Q261 MOTOR +B DRIVER Works when Q260 works.
Q301 CHANGER RESET SW Works when the base level comes "L".
Q320 PANEL 5V SW Works when the base level comes "L".
Q350 P-CON. DRIVER Works when Q353 works.
Q351,352 P-CON. PROTECTION Works when P-CON output voltage goes down.
Q353 P-CON. SW Works when the base level comes "H".
Q370 ANTENNA CONTROL DRIVER Works when Q371 works.
Q371 ANTENNA CONTROL SW Works when the base level comes "H" in the tuner mode.
Q450,451 PRE MUTE SW Works when Q153 works.
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

4
KRC-208S/218,268/288,28MR
CIRCUIT DESCRIPTION
(X14-) IC1 : µ-COM
PORT No. PORT NAME I/O FUNCTION OPERATING CONDITION
1 XIN I µ-com clock. (4.5MHz) -
2 GND - GND. -
3L DATA L I LCD driver data. -
4L DATA S OLCD driver data. -
5L CLK O LCD driver clock. -
6 L CE O LCD driver chip enable. -
7SDA I/O E-volume data. -
8 PLL DATA I/O Tuner data. -
9PLL CLK O Tuner clock. -
10 SD I Tuner signal detection. "H" : Tuner signal exists.
"L" : Tuner signal does not exist.
11 DATA C I Changer data. -
12 DATA H OHead unit data. -
13 CH CLK I/O Changer clock. -
14 - - No connection. -
15 MOTOR O Mechanism motor. -
16 SCL O E-volume clock. -
17-24 - - No connection. -
25 AM+B OAM power supply. -
26 FM+B O FM power supply. -
27 PACK IN I Cassette tape pack-in. "L" : Pack in. "H" : Ejection.
28 FF/REW I FF/REW signal. "L" : FF/REW. "H" : Play.
29,30 GND - GND. -
31 VDD - VDD. -
32 REQ C IRequest from changer. -
33 MUTE O Mute. -
34 CH CON OChanger control. -
35 REQ H O Request to head unit. -
36 SVR O Power IC (IC4) discharge control. -
37 AMP STBY O Power IC (IC4) stand-by. -
38 AMP MUTE O Power IC (IC4) mute. -
39 P CON O P.CON for external amplifier. -
40 ANT. CON OPower antenna. -
41 SW5 OCircumambient circuit power supply control. -
42 ILL O Illumination. -
43 - - No connection. -
44 BEEP O Buzzer. (2KHz) -
45-47 - - No connection. -
48 ROLL OFF I Destination switch. -
49 N.CAN I Destination switch. -
50 SEL1 IDestination switch. -
51 SEL2 I Destination switch. -
52 --
No connection. -
53 EQ MUTE O Tape equalizer mute. -
54 FWD/REV I FWD/REV. -
55 - - No connection. -
56 REMO IRemote control. -
57-60 - - No connection. -
61 ACC DET I ACC detection. -
62 BU DET I Back-up detection. -
63 S METER I Tuner signal meter. -
64 PANEL IPanel on/off. "L" : Panel on. "H" : Panel off.
65,66 GND - GND. -
67 HOLD I Clock stop. -
68 VDD - VDD. -
69,70 GND -GND. -
71,72 - - No connection. -
73 VDD - VDD. -
74,75 GND - GND. -
76 VSS - GND. -
77,78 - - No connection. -
79 GND - GND. -
80 XOUT O µ-com clock. (4.5MHz) -
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

5
TEST MODE
KRC-208S/218,268/288,28MR
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 is not canceled by ACC OFF, power OFF, momentary power
down or the panel off.
3. Audio adjustment
•Set the volume level to -10dB (which is shown as "30" on the display).
•Loudness OFF.
•The BASS/TREBLE and BALANCE/FADER can be set to the full-boost/full-cut and full-
front/full-rear each by pressing the "Track UP" / "Track DOWN" keys.
•Sound coordination doesn't appear for the feed.
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

6
KRC-208S/218,268/288,28MR
ADJUSTMENT/EINSTELLUNGEN (MECHA.)
Einstellung des Kopfwinkels
Vorgehensweise bei der Kopfhöhen-Einstellung
• Während des Bandlaufs in Vorwärtsrichtung die Schrauben Fund F' so
einstellen, daß die Linie A eines 2-Linien-Bands (2-LINE TAPE) durch
die Mitte der Kopfabschirmplatte (Zentrum des Mittelbereichs) verläuft.
• Während des Bandlaufs in Rückwärtsrichtung die Schrauben Rund R'
so einstellen, daß die Linie B eines 2-Linien-Bands (2-LINE TAPE)
durch die Mitte der Kopfabschirmplatte (Zentrum des Mittelbereichs)
verläuft.
• Nachdem die obige Einstellung abgschlossen ist, die Bandlaufrichtung
umkehren und die Ausrichtung in Vorwärtsrichtung noch einmal
überprüfen. Wenn eine Abweichung festgestellt wird, ist diese
Einstellung zu wiederholen. (Verwendetes Band: SCC-1659, hergestellt
von A-BEX)
Head Angle Adjustment
Head height alignment procedure
• During FWD transport adjust screws Fand F' so that line A of 2-LINE
TAPE passes trough the center of the head shield plate (core center
area)
• During RVS transport adjust screws Rand R' so that line B of 2-LINE
TAPE passes trough the center of the head shield plate core (center
area)
• After the alignment above, reverse the transport direction and check the
FWD alignment again. If it is deviated, perform alignment again. (Tape
used : SCC-1659, manufactured by A-BEX)
(2-LINE TAPE)
B
A
B
A
(FWD)
(RVS)
HEIGHT
(FWD)
HEIGHT/AZIMUTH
(FWD) HEIGHT/AZIMUTH
(RVS)
TAPE SPEED
HEIGHT
(RVS)
F''
F
R
R
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

ABDFHJCEGI
2
1
3
5
7
4
6
Refer to the schematic diagram for the value of resistors and capacitors.
PC BOARD (Component side view)
87
W122
R58
R155
R15
W112
R14
R62
W113
R152
R129
R59
W133
W119
R413
C202
R16
R13
W111
W121
R372
R151
C101
R324
C163
R161
W135
R102
R118
R119 R115
R114
R126
R60
R61
R52
R54
R105
R106
R103
R207
R206
C164
R352
R320
C155
C154
C157
C156
C153
C151
C351
C506
R127
R154
R150
R153
R322
R401
R400
R408 R409
R407
R406
R412
R410
R411
R303 R304
R306
R305
R403
R301
R402
R321
W129
C54
R63
R64
R57
W114
C52
W116
R201
R203
R200
C200
C452
C201
R205
R455
R453
R454
R451
R450
R452
R104
C1 C2
C6
C5
C7 C8
R6
R7
R5
R2
R3
R4
C14
R8
C13
R1
C251
R251
R323
W131
W125
C102
C103
W128
W130
R160
W124
W118
R158
W117
W115
W123
R157
R156
R159
R250
R405
R404
R137
W134
W120
R122
R125
R120
R121
R123
R111
R109
W126
R110
W127
R108
W132
R131
C321
TH1
EB
BEBE
EB
BE
EB BE
EB
EB EB
BE
EB
EB
BE
EB
EB
EB
EB
BE
BE
EB
EB
114
15 28
814
71
180
24
25
40 41
64
65
BE
Q61
Q52
Q371
Q59
Q58
Q57
Q153
Q151
Q150
Q55
Q54
Q53
Q50
Q353
Q301
Q320
Q352
Q351
Q202 Q200
Q451
Q450
Q260
IC3
IC2
IC1
X14-614x-xx (J74-0959-22)
SYNTHESIZER UNIT
CN1
Q60 Q56
D411
D405
D352
Q51
Q350
D401
D400
D56
D52
D51
D55
D54
D402
D408
D409
D403
D350
D351/W104
D53
Q201Q203
D200
Q261
D404
D260
IC5
J4
J5 J2
J1
A1
D370
IC4
D50
Q370
D371
D151
D150
D152
P1
WH1
D100
J3
CN2
D261
REMO
GND
W100
W28
W75
W85
W22
W33
W73
W67
W72
W65
W13 W96
W35
W36
W68
W64
W15
W8
W31
W71
W69
W27
W79
W76
W34
W39
W43 W46
W51
W98
W99
W23
L3
R50
R65
R351
R353
R66
W48
W10
X1
C50
C17
C18
C160
C152
C55
W40
W20
C15
C16
C161
C350
C352
C162
C450
C451
C150
C159
C56
C58
C53
C57
W58
W94
W95
W101
W54
W41
W53
W29
W12
W16
W18
W7
R261
L5
R260
L4
C402
C400
C401
W5
W14
W17
W11
C4
C3
C9 C250 C10
W92
W9
W70
W59
W30
W25
W50
W24
W87
W80
W97
W93
W89
W88
W103
W86
W90
W78
W61
W3
W2
W1
W56
W82
W44
W47
W83
W19
W74
W81
W49
W77
W37
W63
W32
W55
W102
W57
W52
W60
W62
W38
W84
W42
W21
W45
L1
4.5M
R202
R55
R67
R350
R370
W105
R371
L8
C206
L9
R373
R116
W26
C320
R138
R132
9
13 10 6 7 5 1 11128432
12 1
2
25
24 1
9
8
16
12
24
25
2
1
1
1
5
6
11
12
1
8
21
BE
BEEB
BE
BE
EB
BE EB
R20
R21
R1
R2
R3
R14
R18
1
2
R13
R12
11
12
R8
3249
R19
C5
64
R11 1
C4
C1
C2
EB
16 17
48 33
R5
R6
R4
D17
J1 IC1
Q1
SWITCH UNIT
D5
D4
D1
D2
D3
D6
D7
D8
D9
D10
D11
ED1
D14
X13-965x-xx (J74-0963-12)
D12
D13
D15
123
4
5
6
PL1
29 1
PL2
ATT
SRC
AUTOCLK
RESET
AUD
AM
FM
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

KMOQSLNPRT
2
1
3
5
7
4
6
Refer to the schematic diagram for the value of resistors and capacitors.
PC BOARD (Foil side view)
910
R13
R14
R18
R8
R11
R12
R19 C4
C2
C1
C5
R3
R4
R2
R1
R21
R20
R5
R6
EB
116
4833
64 4932
17
12
11
2
1
Q1
IC1
D17
J1
D15
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D14
ED1
X13-965x-xx (J74-0963-12)
SWITCH UNIT
PL2 PL1
1
1
ATT
SRC
AUTO CLK
23
45 6 RESET AUD AM
FM
29
R15
R14
R16
W117
R118
C321
R104
BE
R102
R103
C200
R200
C506
C155
C157
C156
W134
C202
R205
W135
C201
EB
R203 R201
R127
C153
R207
R206
R150
R114
C154
R126
14
15
R125
R119
R131
1
28
14
C151
BE
BE
R161
C163
W123
C164
1
R159
R413
W116
R400
EB
R450
R453
EBEB
R452
R454
R455 C452
R402
R451
W114
R405
R406
R404
R401
R412
R409
R411
R410
R408
W133
R403
R407
W111
R13
R3
W130
W129
C103
C102
80 1
R322
R303
R301
R305
R306
R304
R324
R320
R160
R321
B
BE
W131
R323
E
C14C13
R4
R6
EB W115
E
R108
24
R106
R105
8
25
W125
40
41
R110
R158
7
W124
W118
R157
W120
R156
R111
R109
W126
C351
EB
E
B
BE
R352
B
R115
W128
C101
64
65
R123
R137
R121
R250
W132
R7 R8
R58
C54
W127
R120
R122 W121
R129
R54
BE
R52
R59
BE
R154
EB
R155
W119
R152
R151
R153
R372
W113 W112
TH1
C52
R57
EB
C7
R5
C5
R1
C1
C6
C8
R2
C2
R251
C251
R60
ER61 B
BE
EB
EB
W122
R62
R64
R63
EB
IC3
Q260
Q202
IC2
Q150
Q200
Q450
Q153 Q451
Q301
Q320
Q351
IC1
Q371
Q352
Q353
Q50
Q52
Q151
Q54
Q55
Q59
Q58
Q53
Q57
Q61
D260
WH1
Q261
P1
D261
X14-614x-xx
SYNTHESIZER UNIT
(J74-0959-22)
CN2
D200
A1
Q203 Q201
J1
J5
D403
D401
D402
D409
D411
D405
D404
D400
D408
J4
J3
D351/W104
D150
D352
D54
D100 D52
Q51
Q350
D151
D152
Q370
D371
IC4
D50
D51
D350
D370
D53
J2
IC5
CN1
D56
Q60
D55
Q56
1
W46
W45 W47
2GND
R261
W5
1
W1
W3
W2
6W9
R116
W10
R260
W15
W14
W17
W26
W27
W25
W30
W37
REMO
W20
W18
W16
W13
W8
24
1
25
L9
C206
L8 W105
R202
W24
W42
W38
W32
W40
W44
C450
W21
W22
C150
W11
L3
W23
C152
W31
C15
W35
C17
L4 L5
21
W7
C402
1
C400
2
C451
C401
C159
C16
W43
W34 W39
C18
W28
1756910
W12
W19
81312 11342
W33
W29
W70
1112
W56
W65
12
4.5M
X1
W78
C320
W82
R138
W83
C9
8
W94
C58
W100
C53
R371
R373
C352
W57
W48 W49
W52
W55
W62
W36
W58
W61
W50
W63
W60
W59
R353
W93
W97
W81
W84
W85
W87
C250
W92 W89
W88
W90
C10
W80
W74
W77
W86
C55
C56
W67
W68
W51 C160
C162
R370
C350
R351
C161
2
W41
W53
W54
25
W72
W69
W71
24
W64
R350
R50
R55
W76
W79
W75
W73
C50
16
8
9
1
R132
C4
C3
1
15
W103
W102
W96
R67
C57
W95
R66
W99
W98
R65
L1
W101
BE BE
BE
BE
BE
EB
BEB E
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

ABDFHJCEGI
2
1
3
5
7
4
6
0V
0V
5V
0V
5V
0V
5V
0V
5V
0V 5V
5V
0V
0V 5V
5V 0V
0V 0V
5.0V
0V
5V
5V
0V
5V
0V
0V 5V
5V
0V
0V or 5.0V
5V
0V
5V
0V
5V 0V
0V
5.0V
0V
5.0V
0V 0V 0V 0V
0V
7.3V 4.9V 7.3V
14.4V
7.3V
0V
7.3V 7.3V 7.2V 7.2V
0V
7.2V 7.2V 7.3V 7.3V
0V
7.3V
14.4V
7.3V 3.3V 7.3V
0V
5V
0V
0V 5V
0V 5V
0V 5V
0V
5V
0V
5.0V
0V 4V
0V 4V
0V 5V
B LINE
CAUTION: For continued safety, replace safety
critical components only with manufacturer's
recommended parts (refer to parts list). indicates
safety critical components. For continued protection
against risk of fire, replace only with same type and
rating fuse(s). 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.
13
4
3
128
711
2
1
610
59
16 15 14 13 12 11 10 9
8765 432 1
FL+
RL+
FL-
RL-
FR-
RR-
FR+
RR+
P-ANT
P-CON
ACC
B.U
GND
19
23
17
21
9
3 7 5
R412 100
R410 4.7K
R409 4.7K
R402 10
R411 100
R406 4.7K
R407 4.7K
R408 1K
R403 100
7
6
5
35
34
1
12
32
11
10 0.47u50
C401
+
R401
C402 0.47u50
+
R400 4.7 C400 22u6.3
+
R405 100K
R404 100K
R413
100K
17
23
21
19
L1
3300u16
C50
+
6
5
4
3
2
1
T.MUTE
GND
MOT GND
MOT +B
PACK IN
GND
10K
R261
1K
R260
43K
R57
0.01
C52
47K
R55
30K
R52
10K
R54
R370 4.7K
R350 4.7K
R351
1K
R352
3.3u25
C350
+
22K
C351
0.1u50
C352
+
R353
0.068
4.7K
R16
0.22u50
C18
0.22u50
C17 4.7K
R15
0.22u50
C15 4.7K
R13
0.22u50
C16 R14
4.7K
100u10
C159
+
+
C160
1u50
R152 1K
R151 4.7K
R153 91K
430
150K
C162 1u50
+
R157 100
R158 33K
R155
R156
12 11 10 987654321
PAN 5W
L DATA S
L CLK
L CE
L DATA L
u GND
PAN5V
RESET
ILL GND
LAMP +B
ESD GND
R322 2.2K
R301 1K R303 1K R305 1K R304 1K
27K 47K
R320R321
R324
25 23
36
32
34
35
37
38
5
4 6
3
67
28
15
62
40
C56
100u6.3
5.6K
R61
+
47K
R60
10u10
R58
22K
100
R59
C55
+
C54
0.01
100u16
+
39
1K
R67
3 7 5
9
44
GND
7
R160 47K
6
5
4
3
C164
0.01
2
1
9
8
11
10
12
13
VDD 14
1/2W
24
22
13
C53
(F52-0006-05)
F1 (10A)
3.3K
R50
1/2W
61
R371
R373
1K
1K
R372
22K
40
W104
1
2 3
4
5 6 7 8
9
10
11
12 13
14
15 16 17 18
19
20
21
22 23
24
25
TAB GND RR- STBY RR+ VCC FR- GND FR+ SVR FRI RRI GND FLI RLI AC GND RL+ GND RL- VCC FL+ MUTE FL- GND CD
R159 100K
64
40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
65 66 67 68
69
70
71
72 73
74
75 76 77 78
79
80
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
ANT CON
P CON
AMP MUTE
AMP STBY
SVR
REQ H
CH CON
MUTE
REQ C
VDD
GND GND
FF/REW
PACK IN
FM+B
AM+B
SCL
MOTOR
CH CLK
DATA H
DATA C
SD
PLL CLK
PLL DATA
SDA
L CE
L CLK
L DATA S
L DATA L
GND
XIN
GND GND HOLD VDD GND GND VDD GND GND VSS GND XOUT
SW5V
ILL
BEEP
ROLL OFF
NOISE CANCELLER
SEL1
SEL2
EQ MUTE
FWD/REV
REMO
ACC DET
B.U. DET
S METER
PANEL
R110 47K
R108 47K
2
1R104 100K
38 37 36
27 28
26 25
27
R154 750 C161 1u50
+
41
61
62
41
44
R120 47K
R122 47K
R123 47k
R121 47K
2.2K 2.2M
54
64
67
X1
4.5MHz
C103
22P
C102
22P
6
4
3
5
9
10
7
8
11
12
13
R116 4.7K
R119 2.2K
R118 2.2K
1K
10
R306 1K
63
Q301
15
2
2
R131 10K
R114 22K
16
R106 1K
47K
47K
R127
R126
1
BU YEL
ACC
GND
BLK
RED
BLU/WHT
11
10
9
2
3
1
P. CONT OUT
REAR R VIOL
VIOL/BLK
REAR L GRN/BLK
GRN
BLU
GRY
GRY/BLK
14
13
12
6
5
4
WHT/BLK
WHT
16
15
8
7
ANT. CONT
FRONT R
FRONT L
BU YEL
REAR L
REAR R VIOL
VIOL/BLK
GRN/BLK
GRN
GND
BLK
91
ACC
FRONT L
P. CON/ANT. CON
RED
BLU/WHT
10
11
12
2
3
4
GRY
GRY/BLK
WHT/BLK
14
15
13
7
6
5FRONT R
WHT
16 8
A GND
REQ C
DATA C
8B.U.3CON
MUTE
4
59 10
GND
REQ H
1
2
9
6
7CLKRch 13
10 6
RST 11 12
75
DATA H
Lch
13 11 12 8 4 3
1
2
39
TH1
0.01
C101
47K
R125
R105
R132 100K
100K
R129
R138
22K
47K
R137
1K
R115
P1
47u6.3
C320
+
47
R323
R102 R103
1/2W
1/2W
1/2W
Q261
1K 1/2W
Q350
Q351,352
Q51,52
Q151
Q153
IC3
Q320
J4
J2
D400
D401
D403
D402
D408
D405
D411
D409
D404
D50
WH1
D261
D260
Q260
D52
D51
Q50 B.U. DET.
D351
D370 ANT-CON.
Q350
D350
P-CON.
Q351
D352
Q353
Q352
Q151
D151
D152 D150
J3
Q320
Q301
Q53
B.U. 5V AVR
Q52
Q51
D53
D54
Q58
Q60
Q61
Q59
D56
Q153
GND LINE
SIGNAL LINE
A
B
C
CN2
D
Q371
Q261
DRIVER
IC1 :
IC2 : TDA7461ND
IC3 : HD74HC27FP
IC4 : TDA7384A
IC5 : LA3161
Q50,52,57,61
: 2SC2412K or
2SD601A
Q51,261 : 2SB1443
Q53 : 2SA1036K
Q54,58 : DTC144EK or
UN2213
Q55,59,153,352
: DTA124EK or
UN2212
Q56,60 : 2SB1655(E,F) or
2SB1565(E,F)
Q201,203,350,370
: 2SB1277(Q,R)
Q301 : DTA144EK or
UN2113
Q320,351 : 2SA1037K
Q450,451 : DTC143TK or
UN2216
D50 : S2V20 A
D51,405,411
: MA4068(N)-M
D52 : MA4051-L
D53,260,261,350,351,370,371
: AM01Z or
ERA15-01
D54 : MA4056(N)-M
D55 : MA4091(N)-L
D56 : MA4110-L
D100,150-152,352
: 1SS133
D200 : MA4051(N)-M
TOP VIEWJ4
D371
Q370
D100
Q150,200,202
UN2212
DTC124EK or:
Q151,260,353,371
UN2214
DTC114YK or:
MA4062-L
D400-404,408,409
:
ILLUMI.
+B SW
ILLUMI.
+B AVR
DRIVER
MOTOR+B
+B SW
MOTOR
POWER IC
P-CON.
SW
P-CON.
PROTECT.
P.ON. 5V
DRIVER
SYSTEM u-COM
RESET
CHANGER
SW
SVR DISCHARGE SW
PRE MUTE
DRIVER
MUTE
PANEL 5V
SW
47K
47K
22K
10K
47K
22K
22K
47K
10K
47K
47K
47K
10K
22K
22K
47K
10K
22K
IC3
SYNTHESIZER UNIT (X14-614x-xx)
IC4
IC1
DC1
(E30-4784-05)
(E30-4783-05)
KRC-208S/218,28MR (K)
DC1
KRC-268/288 (M)
2SB1565 DTA114EK
DTA124EK
DTA144EK
DTC114YK
DTC124EK
DTC143TK
DTC144EK
2SA1036K
2SC2412K
2SB1277
2SB1443 2SA1037K
LA3161
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

1.3V 0.8V 3.5V 0V 8.2V 3.5V 0.8V 1.3V
4.0V 4.0V 4.0V 4.0V 4.0V 4.0V
4.0V 4.0V 4.0V 4.0V 4.8V
4.0V
0V
5V
0V
5V
0V
8.2V
3.4V
AM+B
19
23
20
21
22
AUDIO OUT
SD
S-METER
IF1+B
14
17
18 VDD 5V
IF2+B
15
16
SDA
SCL
DIG GND
10
11
12
13
OSC GND
VT
PLL+B
IFC OUT
7
8
9
OSC GND
OSC GND
OSC GND
FM ANT
3
4
5
6
AM ANT
OSC GND
FM+B
1
2RF GND
10u16
C450
+
270
R450
10u16
C451 R451
R454
100
R452
30K
2 Lch
R453
30K
R455
100
+
270
1 Rch
0.01
22 23
24
25
0.01
C151
47u10
C150
+
L3 4.7uH
0.1
C506 4.7K
R150
0.1
C155
0.015
C153
0.22
C154
0.033
150P
C157
C156
7 5
6
0.22 0.22
1u50
C152
+
23 IF1 GND
IF2 GND
0.01
C200
0.01
C201
22K
R203
22K
R201
1K
R202
1K
R200
R205
150
9
8
L9 4.7uH
63
10
C206 47u10
+
4.7uH
L5
1
2
3
4
5
FWD/REV
GND
HEAD R
HEAD COM
HEAD L
0.047
C251 10K
R251
1500P
C2
1500P
C1
22K
R1 22K
R2
100u16
C57
+
R62
100u10
C58
+
1K
R64
1K
R63
R65
2.2 1/2W
R66
2.2 1/2W
4.7K 2.7K
R207 R206
3
4
+
0.022
3
C7
120K
R7
100u10100
+
100P
C5
C9
R5 6.8K
R3
L IN 8
L NF
L OUT
7 6
C3
47u6.3
4
10
R250
120K
R8
C250
100u10
R6 6.8K
+
C8
0.022
C10
100u10
R4
100
GND
VCC
R OUT
5
4
100P
C6
R NF
3 2
+
+
C4
47u6.3
R IN 1
16
7
25
26
0-12
0-21
NO YES NO
NO YES YES
MODEL NAME
KRC-208S (K)
UNIT NO.
0-10 NO YES NO
R122R120
KRC-288 (M)
KRC-218 (K)
KRC-268 (M)
KRC-28MR (K)
YES
YES
YES
R121
YES
NO
R123
YES
28 27 26 25 24 23 22 21 20 19 18 17 16 15
AC OUT L
AC OUT R
CREF
OUT LF
OUT RF
OUT LR
OUT RR
VDD
GND
SDA
SCL
S MUTE
MUX R
MUX L
1
2 3
4
5 6 7 8
9
10
11
12 13
14
AC IN L AC IN R TAPE R TAPE L CDR CDRG CDL CDLG PHONE AM MPX LEVEL 1 MP IN MP OUT
54
C13
C14
L4
52mH
C452
NO
YES
NO
YES
NO
YES
NONOYESYESNO
0-11 NO YES
YESNOYESNOYES
0-22 NO NO LC72366-9592YESNO NOYES LC72366-9593
IC1
NONO
NO YES LC72366-9592 LC72366-9592
W104
NONO
CN2
LC72366-9592
T.MUTE
GND
MOT GND
MOT+B
GND
PACK IN
Lch
1
2
FWD
REV
Rch
Ref.99 6
3
4
5
10K
Q54,55
IC2
Q150
A1
REAR PREOUT
Q450
J5
Q451
Q150
Q201
D200
Q203
FM+B SW
ANT
J1
CN1
Q55
Q54
D55
Q56
Q57
+B SW
(X14-614x-xxx)
A
COM
BC
D
Q200 Q202
J1
X13-
2/2
HD1
S3
M
M1
S1
S2
COM+B
AVR
EQUALIZER
AMPLIFIER
ELECTRIC
VOLUME
MUTE
PRE
SW
FM+B
DRIVER
AM+B
DRIVER
AM+B
SW
FRONT-END
E-VOLUME
MUTE SW
4.7K 4.7K
22K
22K
47K
22K
47K
22K
22K
22K
22K
22K
IC5
KRC-208S/218,268/288,28MR (K/K,M/M,K) (1/2)
IC2
A
ME1 (D40-1136-05)
KRC-208S/218,268/288,28MR
KMOLN
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