Icom IC-7800 Service Manual Addendum page 232

Aug. 2008
SCOPE UNIT (4)
CIV
CIVE
J901
CI-V EP901
CIV
EP902
CIVE
C918
CIVE
0.1
1
14
2 13
3 12
4
11
5 10
6 9
7 8
Explanatory notes
IC905
VOLTAGE LINE
TC74HC08AF
CIVE
J902 C914
5 GND
1
9 RI
C911
4 DTR 1
C1+
8 CTS 2
1
V+
3 TXD 3
RS-232
C1-
7 RTS C912 1 4
C2+
2 RXD 5
C2-
6 DSR C913 1 6
R953 0
V-
1 DCD RXD 7
T2O
TXD 8
R952 0
R2I
IC903
RXD_2 ADM202EARN
CP951
TXD_2
CP952
CP953
CIVE
J903
TX+ TX+
TX- TX-
RX+ RX+
NC NC4
LAN
NC5
NC
RX- RX-
NC NC7
NC8
NC
SML-512MW
R913
DS901 LEDR
270
LEDG
R914
270
DS902
SML-512MW
J904
VBUS VBUS1
D- D-1
USB D+ D+1
GND_1
GND
J905
RGND
6 RGND
11 IDO
1 RED RED
GGND
7 GGND
12 SDA
2 GREEN GREEN
BGND BGND
8
13 HC HC
EXT
3 BLUE BLUE
MONITOR
+5V
9
14 VSYNC VSYNC
4 RES
SGND SGND
10
15 SCL
5 GND
CIV CIV
CIVE CIVE
R906
Q904 6.8k
2SA1576 R905 D902
33k 1SS355
R907
15k
Q903
2SC4081
CIVE
MTXD2
C917
CIVE
0.1
1 14
2 13 MTXD1 MTXD1
3 12 MRXD1#
4 11
5 10 CISEL
6 9 CISEL MTXD2
7 8 MRXD2#
IC906
TC74VHCT04AF
CIVE
L902
C916 0.1
VDD5
16 IC904
VCC
TC7W04F
15
GND
14 1 8
T1O
13 2 7
Q922
R1I
12 3 6 DTC114EU
R1O
11 4 5
T1I
R955
10
T2I
9 Q921 0
R2O
DTA114EU
R956 0
Q924
DTC114EU
CIVE Q923
DTA114EU
LEDR
RXD_2 LEDG
TXD_2
TX+
TX-
RX+
NC4
NC5
RX-
NC7
NC8
EP903
VBUS1 EP904
D-1 EP905
EP906
D+1
GND_1
EP907
EP908
RED
RGND
GREEN
GGND
BLUE
BGND
HC
SGND
VSYNC
CP902
CP903
J910
MTXD1
MRXD1#
GND
CISEL to LOGIC
MTXD2
unit J825
MRXD2#
GND
GND
CP907
CP904
J906
CIVE
CIV
CIVE
VDD5
CIVE
to MAIN
NC
unit J411
CIV5V
LED0
LED1
GND
J907
TX+
TX-
RX+
NC
NC
to LOGIC
RX-
unit J802
NC
NC
GND
J908
GND
VBUS1
to LOGIC
D-1
unit J804
D+1
GND
J909
GND
RED
RGND
GREEN
GGND
BLUE to LOGIC
BGND
unit J803
HC
SGND
VSYNC
GND
71