Memory Board - Icom IC-756PRO III Service Manual

L12 L11 L10 L9
LR-307 LR-307 LR-510 LR-511
RL9 RL16 RL8
NY-12W-K NY-12W-K NY-12W-K
C45 150p
RL1 RL10
NY-12W-K NY-12W-K
L20 L18 L16
BM27- BM27- BM27-
400-6A 400-6A 400-6A
L19 L17 L15
BM27- BM27- BM27-
400-6A 400-6A 400-6A
RL2 RL15
NY-12W-K NY-12W-K
TUNER-A BOARD
IC1
SC-1415-1
A16 1
A15
A16
A15 2
A14
BYTE
J2 A14 3
A13
VSS
D8 A13 4
A12
DQ15/A-1
D7 A12 5
A11
DQ7
D9 A11 6
A10
DQ14
D6 A10f 7
A9
DQ6
D10 A9 8
A8
DQ13
D5 9
NC
DQ5
D11 10
NC
DQ12
D4 11
WE
DQ4
D12 12
RESET
VCC
D3 13
NC
DQ11
D13 14
NC
DQ3
D2 15
RY/BY
DQ10
D14 16
NC
DQ2
D1 A18 17
A17
DQ9
D15 A8 18
A7
to MAIN-A DQ1
D0 A7 19
unit A6
DQ8
A6 20
J3504
A5
DQ0
A5 21
A4
OE
A4 22
A3
VSS
A3 23
A2
CE
A2 24
A1
A0
HWR
RD
RD
CSs
CSf

MEMORY BOARD

L8 L7 L6 L5
LA-490 LA-489 LA-490 LA-489
RL7 RL6 RL5 RL4
NY-12W-K NY-12W-K NY-12W-K NY-12W-K
MP9
IC2
M54562P
VHFT 18 1
O1 IN1
17 2
24T
O2 IN2
18T 16 3
O3 IN3
15 4
14T
O4 IN4
10T 14 5
O5 IN5
13 6
7T
O6 IN6
5T 12 7
O7 IN7
11 8
35T
O8 IN8
10 9
Each Frequency band
GND VS
Selected 10.5V
RL12 RL14
NY-12W-K NY-12W-K
C18 0.0047
IC1
M54562P
CI1 18 1
O1 IN1
17 2
CI2
O2 IN2
CI3 16 3
O3 IN3
15 4
VHCI
O4 IN4
VHCO 14 5
O5 IN5
13 6
CO1
O6 IN6
CO2 12 7
O7 IN7
11 8
CO3
O8 IN8
10 9
GND VS
L14
BM27-
400-6A
C17 0.0047
L13
BM27-
400-6A
RL13 RL11
NY-12W-K NY-12W-K
IC2
IDT71256SA15PZ
48 A17 22 21
OE A10
47 A11 23 20
A11 CS
46 A9 24 19
A9 IO8
45 D15 A8 25 18
A8 IO7
44 D7 A13 26 17
A13 IO6
43 D14 27 16
WE IO5
42 D6 C4 0.1 28 15
VCC IO4
41 D13 A14 1 14
A14 GND
40 D5 A12 2 13
A12 IO3
39 D12 A7 3 12
A7 IO2
38 D4 A6 4 11
A6 IO1
37 C1 0.1 A5 5 10
A5 A0
36 D11 A4 6 9
A4 A1
35 D3 A3 7 8
A3 A2
34 D10
33 D2
32 D9
31 D1
30 D8
29 D0
28
27
26
25 A1
10 - 5
L4
CTRL-A UNIT
LA-554
RL3
NY-12W-K
MEASUREMENT CONDITIONS
VOLTMETER :50kΩ/VDC
SUPPLY VOLTAGE :13.8V
DISPLAY :14.1MHz/USB
R40 1k
R39 1k
R38 1k
R37 1k
R36 1k
J5 CHASSIS W11 J8
R35 1k
GND GND
R34 1k
3.5M 3.5M
R33 1k
5M 5M
7M 7M
10M 10M
14M 14M
18M 18M
24M 24M
VHF VHF
GND GND
GND GND
14V 14V
14V 14V
CO3 CO3
CO2 CO2
CO1 CO1
NVHF NVHF
CI3 CI3
CI2 CI2
R41 1k CI1 CI1
GND GND
R42 1k
R43 1k GND GND
R44 1k
R45 1k
R46 1k
R47 1k
J1
to P1
FILTER-A CTIN
unit
J2
J2
P2
to RF-B
RFRX
unit
J101
J3
J3 P3
TUIN TUIN
J4
J4 P4
TUOT TUOT
A10s
J1
D15 A9
D14 A18
D13 A8
D12 A17
D11 A7
A16
D10 A6
D9 A15
D8 A5
A0 A14
A1 A4
A2 A13
A3
A12
A2
to MAIN-A
A11
unit
A1
J3503
A10s
A0
A10f
J6
W2
RESET
ANT2
BYTE
EP1 J5
W1
BYTE
ANT1
CHASSIS
L303 100µH
a
b C3
20p
IC51
CD74HC4094M
C1 C2
16 1 c 2p 68p
VCC STROBE
15 2 d
OE DATA
14 3 e
Q4 CP
D1
Q59 13 4 3.5M
Q5 Q0
DTC114EU HSM88AS
R3
12 5 4.5M
Q6 Q1
10k
11 6
Q7 Q2
10 7 4.6MDL
QS2 Q3
9 8
QS1 GND
R1
Q51 15
DTC114EU
L1
LR-364
CI2
CO2
C228
R2
270p
Q52 3 4 3 4 15
DTC114EU
D241 D25
DWA010 DWA010
2 1 2 1
R4
D2 10k
HSM88AS
R121 1k
R120 1k 7M
C4 C5
R119 1k 10M
2p 75p
R118 1k 14M
R117 1k 18M
R116 1k 24M C12 C16
3p 0.0047
R115 1k VHF
14V
R108 1k CO3
R109 1k
R110 1k CO1
R111 1k NVHF
R112 1k CI3
R113 1k
R114 1k CI1
C302 50p
MEASUREMENTCONDITIONS
L301
VOLTMETER :50kΩ/VDC
C301 27p LR-295
OSCILLOSCOPE :20MHz 1MΩ 25pF
SUPPLY VOLTAGE :13.8V
L302
DISPLAY :14.1MHz USB
C303 50p LR-295
TUNER :ON
C32
R150 R152 C109
1p
390 4.7k 0.1
0.6V 0.03V
Q25
R154
2SC4213
2.2k
D23
MMBV3700LT1
4.6V
14V
RL4
AE5343
Q12
DTC114EU
Q13
D16
DTA114EU
1SS301
L28 L27
LA-236 LA-246
C105 C64
75p 15p
RL3
G5A-237P
Q22
DTA114EU
D20
1SS301
A
14V
B
C
REF
D
FOR
E
F
G
R5
220k 5V
H
IC1b
NJM4558M
5
+ 7
6 I
-
8
3
+ 1
2 J
-
IC1a
4
NJM4558M
-8V
K
R6
220k
5V
L
R136 R137
10k 47
M
R15
2 1
100
D4 5 6
DWA010
3 4 IC14c
TC74AC04F
C17 R139 R140
82p 10k 47
N
R17
100
11 10
IC14e
TC74AC04F
5V
O
D5
HSM88ASR
D8
HSM88AS
0.13V
D9
R45
HSM88AS
10k
0.08V
1.75V Q5
2SK515
P
R46
4.7k
14V 14V
Q
R
RL1
FXE-12G
S
D17
1SS301
RL2
FXE-12G
T
D18
1SS301
Q21
DTC114EU
U
D15
HSM88AS
V
W