Schematic Diagram - Kenwood TK-880 Service Manual

A
TK-880/880H
1
TX-RX UNIT (X57-6450-XX) (A/2)
2
3
CN7
W/N 1
T/R 2
MO 3
TO 4
BEEP 5
8R 6
PSW 7
DEO 8
MM 9
10
AFO
ME
11
MI 12
AHK 13
IGN 14
SB 15
4
SB 16
8C 17
KEY 18
CK 19
DT 20
RSSI 21
LD 22
ES 23
EP 24
EN 25
APTT 26
CP 27
DTC 28
TXD 29
RXD 30
OE 31
FSW 32
E 33
5
CN1
1
DEO
2
AHK/BUSY
3
IGN
4
DI
5
ME/AM
6
MI/TXS
7
PTT
8
SQ
DEO RXD2
CN2
1
LOK/AM
MM
LOK/DTC/TXS/FSW
3
CN3
6 1
HOR
E
SB
3
CN4
1
LOK
RXD1
TXD1
3
7
Note : The components marked with a dot (
16
X57-645 (A/2) 1/4
B

SCHEMATIC DIAGRAM

R305 10k
PLL IC
SA7025DK or CD8468
R301 1k 1 CLOCK
R302 1k 2 DATA
R303 1k 3 STROBE
4 VSS
5 RFIN
C306
1000p
6 RFIN
7 VCCP
R304
8 REFIN
0
9 RA
10 AUXIN
5.10V
L1
10u
7.87V
16.8MHz
8.06V
X1
L77-1946-05
TA75W01FUF
1.56V
5.13V
5
5V AVR
6
5.10V IC9
TA78L05FF 7
R70
0 8
3
1 OUT
IN
COM
2
DC AMP
5C
RSSI
R157 100
R1 1k
R2 0
R94 0
R3 100
R4 1k
$R5
SQ
SQ2
R6 0
R7 0
R8 1k
TXD2
R9 0
R10 1k
R11 1k
TXD1
SB GND RXD1
LOK
C
IC300
L302
VDD
20
TEST
19
LOCK
18
RF
17
RN
R307
16
VDDA
0
15
PHP
14
PHI
13
VSSA
12
R306
PHA
470
11
Q2
RIPPLE FILTER
2SC2412K(S)
R26 R27
IC1
100k 47k
4
3
2
1
3.73V
8.06V
OVER CURRENT PROTECTION
D24
3.10V
R15
10k
R25
390k
5.13V
D1-6,17
DA204U or HSB123
PROTECTION
D1 D4
• ) are parts of layer 1.
D
C320 C322
2.2u10 2.2u10
R319
1k
R316
0
Q301
2SC3722K(S)
ACTIVE
FILTER
L303
C330 C331 C312
22n
2p 2p 4p
L305 L306
12n 12n
Q300
2SC4215-F(Y)
BUFFER AMP
RIPPLE FILTER
7.15V
Q3
2SC2412K(S)
9.42V
9.59V
MINISMDC07502F
CHARGE
D35
MA742
4
5
6 3
7 2
8 1
IC2
TA75W558FU
DET AMP
$R84
D2 D3 D5 D6
E
R318
220
Q302
2SC3722K(S)
ACTIVE
FILTER
8.77V
9CL
CV
HT
8CL
8C
9C
W/N
T/R
MO
TO
BEEP
8R
PSW
AFO
IGN
SB
8C
KEY
CK
DT
RSSI
ES
EN
DEO
OE
DI
5C
PTT
HOR
FSW
D17
C175
1000p
5C
SQ
ME
LOK
AHK
IGN
FC