Icom IC-7800 Service Manual Addendum page 541

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
Explanatory notes 7 8
VOLTAGE LINE IC905
TC74HC08AF
CIVE
C914
J902
5 GND
1
RI
9
C911
4 DTR 1
C1+ VCC
8 CTS 2
1
V+ GND
3 TXD 3
RS-232
C1- T1O
7 RTS C912 1 4
C2+ R1I
RXD
2 5
C2- R1O
6 DSR R953 0 C913 1 6
V- T1I
DCD
1 RXD 7
T2O T2I
TXD 8
R952 0
R2I R2O
IC903
RXD_2
ADM202EARN
CP951
TXD_2
CP952
CP953
CIVE
J903
TX+ TX+
TX- TX-
RX+ RX+
NC NC4
LAN
NC NC5
RX- RX-
NC NC7
NC NC8
SML-512MW
R913
DS901 LEDR
270
LEDG
R914
270
DS902
SML-512MW
J904
VBUS VBUS1
D- D-1
D+
USB D+1
GND GND_1
J905
6 RGND RGND
11 IDO
RED RED
1
7 GGND GGND
SDA
12
2 GREEN GREEN
8 BGND BGND
13 HC HC
EXT
3 BLUE BLUE
MONITOR
+5V
9
14 VSYNC VSYNC
4 RES
10 SGND SGND
15 SCL
GND
5
CIV CIV
CIVE CIVE
R906
6.8k
Q904
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
220µ
C916 0.1
VDD5
16
IC904
15 TC7W04F
14 1 8
13 2 7
Q922
12 3 6 DTC114EU
11 4 5
R955
10
9 Q921
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
D+1 EP906
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
0 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
11 - 17