Icom IC-756PRO III Service Manual page 92

MAIN-A UNIT (2)
BUS LINE1
14V
8V
M5V
H5V
3R3V_d
HV
–5V
R8V
T8V
TRV ON : 0V
OFF : 4.8V
3R3V
Q622
UMH11N
4
5 3
6 2
1
MAIN-A (1)
RECI
MOSL
VOSL
RECO
REAF
DTAF
L3001
L3002
VRAC
VINT
MCK
M5V
VCS
MDAT
VDTI
VX1
R3025 C3013
10k 0.1
VX2
R3026
1.5M
7 –
IC3004B
NJM4558M +
R3019
220
R3006
470
M5V
IC3002
BU4053BCFV
16
MICI 12
X0
13
X1
2
Y0
1
Y1
5
Z0
AMPO 3
Z1
6
INH
MISL 11
A
MICE 10
B
9
C
7
MICO
VOGV
8V
–5V
M5V
10 - 9
14V
8V
M5V
H5V
3R3V_d
HV
–5V
R8V
T8V
RX 0V RX 8V
TX 8V TX 0.2V
7.8V
D611 D601
DA221 DA221
Q611 Q601
R622
2SD1619 2SD1619
1.5k
Q621
2SA1577
R612
R621 1k
47k
R613
10k
Q612 Q602
2SC4081 2SC4081
RX 4.4V
TX 0V
R3032
100k
10µH
100µH
IC3001
ISD4003-04MS
1 28
SS SCLK
2 27
MOSI VCCD
3 26
MISO XCLK
4 25
VSDD INT
5 24
NC RAC
6 23
NC VSSA
7 22
NC NC
8 21
NC NC
9 20
NC NC
10 19
W3001 NC NC
C3004 R3017
11 18
VSSA VCCA 1 2.2k
12 17
VSSA ANAIN+
13 16
AUDOUT ANAIN–
14 15
AMCAP NC C3003
0.1
R3028
6
82k
5
R3013 C3012
8 3
1 + 10k 0.047
IC3004A
2
NJM4558M
–
4
C3030 C3025 R3021
0.1 10 220
14 IC3003
X
R3020
15 M5282FP
Y 47k
C3015
4 1 10
Z VCC2 VCC 10
2 9
IN+ VCAOUT
3 8
IN– CTL
4 7
OUT VCAIN
5 6
R3034
GND NC
1.2k
C3017
10
8
L3602 HF50ACC322513-B
L3601 HF50ACC322513-B
L3501 HF50ACC322513-B
UNLC
D3601
MA2S111
TMD R3603
LFMD R3604
LMFD R3605
ISTA R3608
IKEY R3609
R602
1k
TRVI R3612
RXS R3617
R603
TXS R3618
10k
TRAS
RX 0V
SENI
TX 4V
PWRS R3622
CW KEY DOWN
SIDE TONE LIMIT :OFF
800mV
BEEP R3625
0V
2.45mS
STON 1
IC321A
NJM4558M
SCPL
VOXL C3638 0.1
IC3005
AVXL
BU4053BCFV
16
12 14
X0 X
13 15 Explanatory notes
X1 Y
2 4
Y0 Z
1 VOLTAGE LINE
IC3631
Y1
5 BU4053BCFV
Z0
TX LINE
3 FORL 1
Z1 Y1
6 NSQO 2
INH Y0
11 REFL 3
A Z1
10 4
B Z
9 FMTL 5
C Z0
6
INH
7 8 7
VEE
8
VSS
C3032
0.1
C3021
0.1
R3650
4.7k
ALCL
R3030
SML
100k
PWRK R3647
SKYS R3643
RTKI R3644
B
G
R
R3022
470
HSYNC
VSYNC
L3603 RCR-875D-472K
UNLC_
R3601
1k R3602
47k
Q3002
2.2k DTA114EE TMD_
1k LRXD_
1k LTXD_
1k ISTA_
1k IKEY_
1k TRVI_
1k RXS_
1k TXS_
EP3622
EP3621
1k
1k BEEP_
C323
0.001
R323 R322 C322 R3626
8 2
– 120k 120k 0.0047 1k
3 STON_
+
4
R3637 1k SCPL_
R3638 1k VOXL_
R3639 1k AVXL_
R3641 1k ASO1_
R3640 1k ASO0_
R3642 1k ASO2_
ASL
16
VDD
15
Y
14
X
13
X1
12
X0
11
A
R3649
10
B NTCG16
9
C
D3508 D3509
RB706F-40 RB706F-40
1k PWRK_
1k SKYS_
1k RTKI_
R3572 39k FPDAT14
R3573 20k FPDAT8
R3574 10k FPDAT7
R3575 10k FPDAT6
R3576 10k
R3582 39k FPDAT11
R3583 20k FPDAT5
R3584 10k FPDAT4
R3585 10k FPDAT3
R3586 10k
R3592 39k FPDAT9
R3593 20k FPDAT2
R3594 10k FPDAT1
R3595 10k FPDAT0
R3596 10k
HSYNC
VSYNC
A
B
C
D
E
F
G
H
HV
I
RXF
J
K
L
FZVP
M
FZRS
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
AA