Icom IC-A25N Service Manual page 81

• MAIN UNIT (3/4)
Q52 DMG564050
4
IC5
LDTC144EE 1 16
STR V+
Q236 2 15 5
D OE
3 14
CLK Q5
NARROW 4 13 6
Q1 Q6
5 12
Q2 Q7
6 11
Q3 Q8
7 10
Q4 Q'S
8 9
GND QS
CD4094BPWR
J6
PSTB
1 2
PDATA
3 4
PCK
5 6
UNLK
7 8
VOLDATA
9 10
VOLCLK
11 12
RFSTB
13 14
SCK TXC
15 16
SDATA
17 18
OE
19 20
DA1STB
21 22
DA2STB
23 24
+3V
25 26
+5V AFC
27 28
VCC
29 30
31 32
33 34
35 36
37 38
39 40
41 42
43 44
45 46
BTAF
47 48
49 50
SPMUTE
8
V+ IC222
GND NJM2904CRB1
4
*R478
R214
820k
R657
220k
6
IC222
2
7
1
5
3
IC222
NJM2904CRB1
NJM2904CRB1
1M
R597
R487
270k
*Refer to the PARTS LIST for the value and name of component.
3
R499 C567
2 8
4.7k 1
9
1 10
IC215 11
1 14 12
GAIN1 IN
2 13 13
GAIN2 GAINSW
3 12 14
DET INT
4 11
1
OUT SENSE
5 10
C566
BUFFIN VREF
6 9
BUFFGAIN V+
0
7 8
BUFFOUT GND
R231
NJM2783V
PCON
INTPTT
PWRBTN
PWSW
RFDETV
RSSI
SBATT2
VIN
VORDET
VORON
BATDATA
BEEP
CLONE
DCIN
PTT
EMBI
DETO
JACKDET
LVIN
PATMP
NOISE
CHGC
CHGIH
INTPTT
R485
100k
*R479 R481 R483
100k 100k
5.0 V
C561 C563 C565
470P 100P 15P
*C631
R488 R490 R492
560k 56k 100k
R494
120k
NJM2904CRB1
NJU72341V
IC232
V+ SCL
7 8
VREF SDA
6 V+
GND MUTE 0.1
R227
5 GND
OUT2 IN2
4 4
1k C643
OUT1 IN1
3
NC NC
2
NC NC
1 NJM2904CRB1
IC229
C641
3
1
0.1
2
IC232
NJM2904CRB1
C623 C622
RB886CS
5
0.018 0.018
7
D74
6
IC232
R544
56k
33k
TC7W53FK
R566
A GND
5 4
CH1 VEE LMV321IDCK
6 3
CH0 INH C627 R563 5 IC233
7 2 1
VCC COM R568
8 1 4
0.1 18k
IC228
3
C637
2
0.1
Q245
LDTA144EE
9-5
R443
18k
R593
R225
0 10k
IC231
1 8
COM VCC
2 7
INH CH0
3 6
VEE CH1
4 5
GND A
TC7W53FK
D36
R224
L2SA1576AS
15k
L1SS400
Q50
VCC
D23
R145 DA3S101F0
10k
2SB798
Q26
DRC9114E0
Q233
LDTC114EE
R680
22k
IC221
1k
1 8
Shutdown VOUTN
2 7
VREF GND
3 6
MODE VDD
C538
4 5
VIN VOUTP
220
ISD8102SYI
Q246
LDTC144EE
HV
VCC
+5V
+3V
C242
0.1
J2
MPZ2012S331A
EXTPTT EP6
EP7
MPZ2012S331A
2.2k
R528
MC1
F6027AP
Q226
Q25
LDTC144EE
MPZ2012S331A
W10000
J4
EP23
1 1
SP1
2 2
EP10
MPZ2012S331A
RSR025N03
Q232
R549
56k
C666
0.1
BLM15BD102SN1 EP25
EP26
J5
BLM15BD102SN1
MOD
Explanatory notes
TX Line
RX Line
Voltage Line