Kenwood KRC-21SA, KRC-266 Schematics
A B C D E
1
2
3
4
5
6
7
+B
BU
BU
BU
BUBU
+B
+B
+B
P5VP5V
13
4
3
128
711
21610
59
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
6
5
4
3
2
1
T.MUTE
GND
MOT GND
MOT +B
PACK IN
GND
10K
R261
1K
R260
28
15
1K
R67
1/2W
13
Q370,371
27
2
A GND
REQ C
DATA C
8B.U.3
CON
MUTE45910
GND
REQ H
1
2
9
6
7
CLKRch 13
10 6
RST1112
75
DATA H
Lch
13 11 12 8 4 312
Q260,261
Q58,59
Q60,61
RR+
ANT CONT/
GND
RL-
FR+
FR-
FL-
FL+
P. CONT
GRN
VIOL
VIOL/BLK
GRN/BLK
WHT
GRY
GRY/BLK
WHT/BLK
BLU/WHT
RED
BLU/WHT
BLK
658
7
ACC
PCON
FR-
6578
FL+
RL+
FL-
214
3
214
3
FR+
RR+
RR-
98
10117
6
125
134
143
15162
1
TEL MUTE
BUP
A
B
YEL
BRN
RL+
RL-
RR-
B LINE
GND LINE
SIGNAL LINE
SW
ANT-CON.
J4
D400
D401
D408
D405
D411
D409
D404
WH1
D261
D260
Q260
Q58
Q60
Q61
Q59
D56
Q261
IC1 :
IC2 : TDA7461ND
LC72366-9592
IC3 : HD74HC27FP
IC4 :
∗
IC5 : LA3161
Q50,52,57,61 : 2SC2412K or
2SD601A
Q51,261 : 2SB1443
Q53 : DTA114YK or
UN2114 or
KRA107S
KRA103S
2SA2057 or
KRC104S
Q54,58 : DTC144EK or
UN2213 or
Q55,59,153,352
: DTA124EK or
UN2112 or
Q56,60 :
2SB1655(E,F)
2SB1565(E,F) or
2SB1548(P) or
Q201,203,350,370 : 2SB1277(Q,R)
Q301 : DTA144EK or
UN2113
Q320,351 : 2SA1037K
Q450,451 : DTC143TK or
UN2216
D50 : S2V20
∗
A or
1N5393G-M6
D51,405,411
: MA4068(N)-M or
D52 : MA4051-L
D53,260,261,350,351,370,371
: AM01Z or
ERA15-01 or
DSM1SD2
HZS7A3L
D54 : MA4056(N)-M
D55 : MA4091(N)-L
D56 : MA4110-L
D100,150-152,352
: 1SS133
D200 : MA4051(N)-M
TOP VIEWJ4
Q150,200,202
UN2212 or
KRC103S
KRC107S
DTC124EK or:
Q151,260,353,371
UN2214 or
DTC114YK or:
MA4062-L
D400,401,404,408,409
:
ILLUMINATION
+B SW
ILLUMINATION
+B DRIVER
+B SW
MOTOR
ISO CONNECTOR
CONNECTOR
MOLEX
13.6V
14.4V
13.6V
10.2V
47K
47K
22K
10K
47K
22K
∗
A
(E30-4790-05)
KRC-266/266S
DC CORD
DC CORD
(E30-4784-05)
KRC-21SA/SG/21SYA/SYG
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
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.
!
2SB1565
DTA114EK
DTA114YK
DTA124EK
DTA144EK
DTC114YK
DTC124EK
DTC143TK
DTC144EK
KRC103S
2SC2412K
2SB1548
2SB1277
2SB1443
2SA1037K
LA3161
F G H I J
10K
∗
R161
BU
BU
BU
BU BU BU
BUBU
BU
BU
BU
BU
BUBU
BU
BUBU
BU
+5V
+5V
+5V
P5V
+5V
+5V
+5V
+5V
+5V
+B
+B+B
P5VP5V
+5V+5V
+5VP5V
+5V+5V
+5V
P5V
+5V+5V
P5V
P5VP5V
+5V+5V
+5V
41
∗
C163 0.01
0.01
C321
R129 22K
16151413
12
11109
8765 432 1
FL+
RL+
FL-
RL-
FR-
RR-
FR+
RR+
P-ANT
P-CON
ACC
B.U
GND
19
23
17
21
9
375
17
23
21
19
L1
3300u16
C50
+
43K
R57
0.01
C52
47K
R55
33K
R52
10K
R54
4.7K
R370
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
10u16
R152 1K
R151 4.7K
R153 91K
430
180K
C162 1u50
+
R157 100
R158 33K
R155
R156
1211109876
54321
PAN SW
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
62
40
C56
100u6.3
+
10u10
R58
22K
100
R59
C55
+
C54
0.01
100u16
+
39
375
9
44
GND
7
R160 47K
6
5
4
3
C164
0.01
2
1
9
8
11
10
12
13
VDD
14
24
22
C53
F1 (10A)
3.3K
R50
1/2W
61
R371
Q370,371
R373
1K
1K
R372
22K
40
∗
W104
1
2
34567
8
9
10
11
12
13
14
151617
1819202122
232425
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
403938373635343332
31
302928
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
656667
6869707172
7374757677
787980
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
SEL3
EQ MUTE
FWD/REV
REMO
ACC DET
B.U. DET
S METER
PANEL
R110 47K
R108 47K
383736
27
28
26
25
R154 750 C161 1u50
+
61
62
41
44
∗
R120 47K
R122 47K
∗
R121 47K
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
R131 10K
R114 22K
16
R106 1K
47K
47K
R127
R126
1
39
TH1
0.01
C101
47K
R125
R105
R132
100K
2.2M
R103
R138
22K
47K
R137
1K
R115
P1
47u6.3
C320
+
47
R323
1/2W
1/2W
1/2W
1K 1/2W
Q350
Q351
Q151
Q153
IC3
Q320
140uH
SW
ANT-CON.
J2
D50
D52
D51
Q50
D370
4.7K
R350
D350
Q350
P-CON.
Q351
D352
Q353
Q352
Q151
D151
D152
D150
J3
Q320
Q301
Q53
Q52
Q51
D53
D54
∗
Q153
Q371
DRIVER
Q51,52
BACK-UP
5V AVR
BACK-UP DETECTION
(MOMENTARY POWER
DOWN DETECTION)
SW
D371
D351
Q370
D100
POWER IC
P-CON.
SW
P-CON.
PROTECTION SW
Q352
P-CON.
PROTECTION
INHIBIT SW
P.ON
5V AVR
SYSTEM u-COM
RESET
CHANGER
SW
SVR DISCHARGE SW
PRE OUT
MUTE DRIVER
MUTE
LOGIC
PANEL 5V
SW
0V
0V
5V
0V
5V
0V
5V
10.2V
5.0V
5.0V
5.0V
0V
5V
5V
0V
5V
0V
0V
5V
5V
0V
0V
0V
5.0V
0V
5V
5V
0V
5V
0V
0V
5V
5V
14.4V
14.4V
0V
0V or 5.0V
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
22K
22K
47K
10K
47K
47K
47K
10K
22K
22K
47K
10K
47K
10K
∗
C
IC3
SYNTHESIZER UNIT (X14-685X-XX)
∗
IC4
IC1
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