Kenwood TK-880 Service Manual page 21

K
TK-880/880H
TX-RX UNIT (X57-6450-XX) (A/2)
D40,41
RF SWITCH
D40 R403 C234 R425
HVC131 0 5p 0
C62 D41
2p HVC131
R223
1k
R:8.02V
T:0V
Q11
2SA1362-F(Y)
R:7.28V
T:8.06V
R:4.95
Q10
T:0.01V
DTC114EE
8C
8R SW CONTROL
KEY
T/R
RSSI
PC
8R
R215
10
L207
L79-1585-05
C275 R225
4p 0
Q201
2SC3357-A
RF AMP
R:0.97V
T:0.11V
D205,206
VARI-CAP
TUNE
DEO
W/N
STR
9C
SB
IGN
OE
ES
DT
CK
5C
H/L SW
PROTECTION
D8 Q29
DA204U or HSB123 DTC114EE
IC7
BU4094BCFV
16
1
STRB VDD
2 15
CODE3
DATA OE
3 14
CLK Q5
4 13
HIGH POWER:4.96V
Q1 Q6
LOW POWER:0V 5 12
Q2 Q7
11
6
Q3 Q8
10
7
IC7
Q4 Q'S
9
8
SHIFT
VSS QS
REGISTER
HNC
SQ
ME
LOK
AHK
IGN
PSW
BPO
18
X57-645 (A/2) 3/4
L
SCHEMATIC DIAGRAM
RF AMP
RF AMP
Q202
2SC4093(R27) 2SC3357-A
C245
5p
R231
10k
R:0V
T:4.37V
R:0.01V
T:7.95V
D207
DA204U
8R SW
8T SW
TEMPERATURE
Q12
COMPEMSATING
2SB1132(Q,R)
R:8.06V R:0V
T:7.29V
T:4.89V
Q13
DTC114EE
8T SW CONTROL
L211
L39-1272-15
L209
*
* R227
TP2
L210
C218
L39-1272-15 GN2011(Q)
3
470p S2
2
S1
1
G2
5.13V
PROTECTION
R:5.07V
T:0V
SHIFT
REGISTER
D9
DA204U or
IC8
HSB123 BU4094BCFV
16
1
STRB VDD
2 15
DATA OE
3 14
CLK Q5
4 13
Q1 Q6
5 12
Q2 Q7
11
6
Q3 Q8
10
7
Q4 Q'S
9
8
VSS QS
CODE4
AF MUTE GATE
M
Q204
R:0V
T:1.18V
R:0V R:0V
T:4.49V T:1.94V
R120
*
R112
4.7k
Q17
2SC2412K(S)
PC SW
R:4.86V
T:0V
R251
470k
R:0.63V
T:4.35V
DET MUTE
Q18
2SK1824-A
8.06V
R124
5.08V
22k
L6
L34-4787-05
MIXER
IC200 L212
L39-1272-15 C233 L213
4
0.01u 150n
D2
C231
5
D1
6
0.1u
G1
L2
R68
100
5.13V
4.72V
D12-14
ST
PROTECTION
D12 D13
DA204U or DA204U or DA204U or
HSB123 HSB123 HSB123
AF
MUTE
ST
Q8
DTC363EU
R60
4.7k
CODE2 CODE1 OPT
D11
DAN202U
X57-6450-XX(A/2) D401 VR1 L4 L209
-10 K NO 100k 82n NO
-13 HK MA2S077 20k 8.2n 6.8n
N
RF AMP
Q205
2SC3357-A
C251
7p
R:0V
T:7.06V
R:0V
T:1.41V
D401
TEMPERATURE
PROTECTION
*
R457
150k *
R458 R459 *
4 OUT
IN(-) 3
10k 15k
VEE 2
5 VCC
IN(+) 1
IC402
TA75S01F-F
R:0V(K,HK)
T:3.90V(K),2.51V(HK)
APC DC AMP
R110
47
R:2.25V
T:0V
R230
6.8k
TP4
Q203
2SC3357-A
R250 C243
R224 C239
0 0.01u
0 0.01u
R:0.64V
R:1.41V T:0.03V
T:0V
D203
PRE IF AMP
13.54V
C63 R76
AF
15k
0.01u
POWER AMP
7.48V
D14
13.13V
Q9
DTA114YUA
AF
MUTE
13.2V
R120 R139 R227 C69 C173 C224
4.7k 0 0 150p 1u16 NO
6.8k NO NO 6p 3.3u6.3 7p
O
D401
R139
C432
8T
8C
RSSI
8R
XF1
L71-0572-05
R89 R96 44.850M
0
330
DM
DEO
W/N
5C
9C
SB
IGN
IC10
LA4422-E
D16
REVERSE
CURRENT
PROTECTION
IGN
TOF
PSW
PA
C281 C432
4p NO
3p 0.01u