Icom IC-7300 Service Manual page 38

(Amended page)
October 2016
• MAIN UNIT (MAIN-3)
USB3R3V
R625
1.5K
X621
CR-1019
R621 1
DP0 DP4
R622 27 2
DM0 DM4
27 3
VCC OVRCUR4
R623 4
RESET IC621 PWRON4
100K 5
TUSB2046BIVFR
EECLK DP3
6
EEDATA/GANGED DM3
R624 7
GND OVRCUR3
1.5K 8
BUSPWR PWRON3
LRB706F
D621
LRB706F C628
22P
R627
D622 15K
C629
22P
R628
15K
USB3R3V EP641
MMZ1005B601C
8 28
VBUS DTR
9 27
RST DSR
10 26
Q641 NC TXD
11 IC641 25
LDTC143ZE SUSPEND RXD
12 CP2102GMR 24
SUSPEND RTS
13 23
NC CTS
14 22
NC NC
J601
3 2
4 1
Q642
LDTC143ZE
[USB]
R691 R692
18K 10K
EP691
J691 MMZ1005B601C
CIV
Q691
L2SC4081
[REMOTE] R693
CP691
CIVE
12K
SHORT1005
CP692 CP693
SHORT1005 SHORT1005
R711 R713
18K 10K
Q711
L2SC4081
R712
12K
CP711 CP712
SHORT1005 SHORT1005
J751 MPZ2012S601A 470 CE-LX
EP751 C751
MPZ2012S601A
[EXT-SP] EP752
J752
Q746
TPCF8107
2
1
Explanatory notes
TX signal
RX signal
Voltage Line
R663
1M
X661
CR-1020
R633
24
27
23 R631
22 27
21
20
19
18
IC661
17
PCM2901E
IC662
1 5
A VCC
Q661 2
B
LDTC143ZE 3 4
GND Y
SN74AHC1G32DCK
R647
Q644 22
LDTA114EE
R653
R654 22
22
R648
22
Q645
LDTA114EE
Q643
LDTC143ZE
Q692
L2SA1576AR
IC701
12
14
74VHC04FT
V+ IC701
IC701
GND 74VHC04FT
6 5 7
74VHC04FT
Q712
L2SA1576AR
IC701
74VHC04FT
34
R717
R718 22
IC701 22
74VHC04FT
8 9
L721
68U
D721
33U 33U
DZ2J062M0
L732 L731
Q747
RUE002N02
CP741
SHORT
35
UPWS
HSENI
C674
10
Q801
LDTA114EE
C683 R687
10 4.7K
USKI
UDRXD/UDBSY
UDTXD
USSENI
USSPD
VBUS
UCLKS
CRXD/CBSY
CTXD
SPS
R723 14V C720
R724 3.3
470 CE-LX
3.3
D722 L1SS400 R727 18K
C724 22P
R725 47K
C726 10
C722 10 1 C728
PGND PIN R730
9 2 0.0033
SW NIN
1 8 3 C727
BS Timer 10K
7 4 2.2
VDD AGND
6 5 R726
UVP EN
1K
IC721 MP7741
MP721 3765
R792 R790
R794
Q802
100K 100K
120K
L2SC4081
R805 D801
2
1
33K L1SS400
R793
3
82K
IC791
NJM2904CRB1
Q803
DSC7004S0
R801
150
START
14V
C811
C812 2.2
2.2
R831
10K
ASQLS
Q831
LDTC143ZE
RTKI
R823 D821
Q821
L2SC4081
EALC
33K L1SS400
R843
KEY
1K
12 13
EKEY
R797 R798
IC701
74VHC04FT 100K 100K
R796
BANV
100K
D851
LRB706F
5V
IC701
74VHC04FT
TCON 10 11
EALC
BANV
HTRAS
ASQLS
USQLS
Q852
LDTC143ZE
ESTA START
*: Refer to the PARTS LIST for the value and name of component.
14V
8V
5V
H4V
H3R3V
3R3V
MAIN-1
14V
R795
100
8
V+
IC791
NJM2904CRB1
GND
4
MPZ1608S601AEP771 1
J771
SHORTCP772 2
MMZ1005B601CEP774 4
4 3 2 1
MPZ1608S601AEP773 3
8
MPZ2012S601AEP778
8 7 6 5 [ACC]
7
MMZ1005B601CEP782 12
12 11 10 9
MMZ1005B601CEP781 11
MMZ1005B601CEP783 13 13
MMZ1005B601CEP780
MMZ1005B601CEP776
EP779
MMZ1005B601C
EP775
MMZ1005B601C
EALC
BANV
HTRAS
ASQLS
USQLS
KEY
START
AFONS
MAIN-1
RTKI
RTKI
EKEY
EKEY
TCON
TCON
ESTA
ESTA
MAIN-2
HSENI
HSENI
SPS
SPS
UPWS
UPWS
USSPD
USSPD
VBUS
VBUS
AMOD
UDTXD
UDTXD
AAF
UDRXD/UDBSY
UDRXD/UDBSY
UMOD
CTXD
MAIN-4 CTXD
DETAF
CRXD/CBSY
CRXD/CBSY
MICE USSENI
USSENI
MICI USKI
USKI
UCLKS
UCLKS
J761
EP761 MICI
1
EP762 MPZ1608S601A MICE
2
MPZ1608S601A PHE
3
EP764 PHO
4
MPZ1608S601A