Kenwood KRC-20SA Service Manual page 11

K
SWITCH UNIT (X16-1492-7X)
1
2
J1
PANEL SW 12
R11 100
L DATA S
11 64
R12 100
L CLK 10 63
X14-
R13 100
J3
L CE 9 62
R14 100
L DATA L 8 61
1/2
N.C. 7
A
u-GND 6
5.0V
PAN 5V 5
+5V
RST
RST 4
ILL-GND 3
10.2V
ILL+B 2 +B
D17
ESD-GND 1
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.
L
AUTO
VOL- VOL+
CLK ATT SRC
6
T.UP AM
AUDIO FM T.DOWN
5 4 3
Q1
10K
KI1
KI2
KI3
KI4
+5V
R21
13
R20
PL2 PL1
13
61
∗
∗
62
D14 D15
R6
63
∗ ∗ 470
D12 D13
64
R5
470
∗ ∗ ∗
D9 D10 D11
R4
330
∗ ∗ ∗
D6 D7 D8
R3
∗ ∗ 330
D4 D5
R2
∗ ∗ ∗
470
D1 D2 D3
R1
330
M
IC1 : LC75853NE D1-13,15
D14
Q1 : DTA114EK or
D17
UN2111 or
KRA102S
KS1
GND LINE
B LINE
+B
KS2
ED1
KS3
KS4
KS5
Q1
KEY-MATRIX
10K
PERMISSION
SW
49
KS6
50
KI1
51
KI2
52
KI3
5V
53
KI4
0V
54
KI5
0V 55
TEST
R8 4.7
56
VDD
+5V 5.0V
C2 0.01
C4 0.047
57
VDD2
3.3V
C1 0.047
58
VDD1
1.7V
0V 59
VSS
R19 56K
5V
3.3V
C5 1000P
0V 60
OSC
5V
61
DATA L
0V
62
CE
63
CLK
64
DATA S
5V
0V
5V
0V
N
∗
: (X16-1492-7X)
∗
:
MODEL NAME UNIT No. D1-13,15
: MA3062-M
KRC-20SA (E) 2-71 B30-1566-05
KRC-20SG (E) 2-72 B30-1565-05
S32
S31
5V
S30
0V
S29
S28
S27
S26
S25
IC1
S24
LCD DRIVER
S23
WITH
KEY-MATRIX
S22
S21
3.3V
1.7V
S20
5V
S19
0V
S18
5V
0V
S17
O
D14
B30-1511-05
B30-2025-05
32
32
31
31
30
30
29
29
28
28
27
27
26
26
25
25
24
24
23
23
22
22
21
21
20
20
19
19
18
18
17
17
KRC-20S (2/2)