Icom IC-756PRO III Service Manual page 87

A
B
C
R2306
R2309
10k
D 100
R2308
E 4 10k
2
1 -
F
3
+
G
IC2601A
RX 90dBµ input:200mVp-p 8
TC7WH74FU
TX AM : 1.2V
FM : 970mV
SSB :174mV R2329
150
H
C2321
0.0068
5V
10.42µS
ALRC
ABCK
ADSD
Q2321
2SJ381
5V
162nS
AVEN
MSL1
CALS
IC2348
TC7SET08FU
Explanatory notes
ACKS
VOLTAGE LINE
TX LINE
RX LINE
IC2341A
TC74VHC00FT
COMMON LINE
IC2341D
TC74VHC00FT
12
11
13
R2361
220
IC2344A IC2344B
AGC
I TC74VHC74FT TC74VHC74FT
1 14
J
D-5A
K R2362
220
2 5
D Q
3 6
CK Q
7 4
C2340
0.0047
DSRS
DLRC
ABCK
DDAD
DRAF
L
IC2351
D-8A AD1854JRSZRL
M
D8VA
N
M5V_d
O
P
TXS
5VA
D-8A
D-5A
D8VA
Q
R
S
IC2291 TX 4.2V
TC4W53FU RX 0V
R2304
IC2601B
10k R2302 C2301
TC7SU04F
C2613
10k 10
6
10 1 8
7
-
5 2 7
+ W2302 W2301
3 6
4 5
2.2V
R2321 100
IC2321
3.7V
AK5394AVS
R2603
1 28
47k
VREF AGND
2 27
VCOM AINR+
3 26
AGND AINR-
4 25
R2602
AINL+ AGND 4.6V
5 24 3.3k
AINL- VA
6 23
ADCTL VL
7 22
R2601
MCLKA LGND 13pin
8 21
3.3k
TSTO1 TSTO2
9 20
DACTL MCLKD
10 19
CAL CS/PON
11 18
16pin
VD CDIN/DFS
12 17
DGND CCLK/(S/M)
16
13
LRCK SDATA1
14 15
SCLK SDATA2
R2327
2.2k
C2328
100
Q2322
4.6V
2SJ381
D8VA
D-5A
5VA
M5V_d
W2321
IC2342 16
C2345
5
TC74VHC4040FT 10
0.1
1 W2322 CLK Q1
4
2 Q2
W2323 11
R2349
RST Q3
3 56
W2324 Q4
Q5
W2504
Q6
14
1 W2509
Q7
3
2 Q8
W2510
R2340
Q9
56
7
W2511 Q10
Q11
W2472
Q12
W2463
8
R2344
R2347
100
C2348 C2347 100
0.1 0.1
13
R2363
5
220 5
12 9 1 IC2347
D Q 4 1
4 TC74HC390AF
2
2
11 8 R2364
R2365
CK Q
3 220
56
3
10
IC2345 IC2346
TC7SH32FU
TC7SET08FU
C2346
0.1
C2480
10
R2356
2.2k
R2357
2.2k
R2360
2.2k
R2394
100k
D2373
MA2S111
C2281
0.47
IC2281C IC2281D
NJM2058M NJM2058M
9
8 R2253
- 13
14
10 - 22k
+
12
+
R2256 R2255
22k R2254
22k
22k
C2218
R2221
0.0022
150k
C2220
R2223 R2222
6 R2219
10 W2201
7
- 82k 82k 390k
5
+
IC2211B
M5218AFP
R2346
8 6
100
1
5
CK Q
2 3
D Q
9
7 4
7
6
IC2281A
IC2343
NJM2058M
5
TC7WH74FU
3
2
4
C2425
4 IC2341C 2
0.22
-
TC74VHC00FT
13 3
+
12 9
8
11
14 10
15
1
4
6
5
IC2341B
TC74VHC00FT
IC2302
TC4W53FU
R2350
27k
C2367 R2351
1 10k
6
7
-
5
+
IC2371B
µPC4570G2
8
2
1
-
3
+
IC2371A
4 µPC4570G2
RX AM 320mVp-p
USB 340mVp-p
FM 170mVp-p
TX AM 200mV
780mV
TX 4.2V
USB 100mVp-p
RX 0V
FM 1Vp-p
5VA
D-8A
D-5A
D8VA
R2242 R2241
R2217
220k 10k 470k
IC2211A
IC2281B
M5218AFP
NJM2058M
R2252 R2244
C2211
8
6 2
22k 6.8k 1
7 - - 0.0047
5 3
+ +
4
Q2211
UNR9211J
C2214 R2216
10 1.5k
R2257
1k
Q2202
UNR9211J
Q2201
UNR9211J
D8VA
R2580
R2577 C2573
470k
100
0.1
R2571
R2572 R2573
C2580 R2575 R2581
82k 82k
82k
5
0.1 120k 100k
7
+
6
C2571 -
0.22
IC2472B
M5218AFP
IC2441B
NJM2058M
R2442 R2443
6
7
10k 10k -
1 5
+
R2445 R2446
R2444
10k 10k
10k
C2311
0.22
C2387
C2383
0.0027
0.0015
R2385 R2386
9
C2395 R2382 R2383 R2384
13 1k 1k -
0.22 1k 1k 1k 14 10
- +
12
+
IC2381C
IC2381D
µPC4574G2 µPC4574G2
TX FM
2µS
SSB
4Vp-p
W2401
AM
500mV
IC2401
MAX293CWE
IC2372
BU4053BCFV
1 16
2 15
16
12 14 3 14
X0 X
R2403
13 4 13
X1 15k
2 15 5 12
Y0 Y
1 6 11
R2402
Y1
5 4 7 10
15k
Z0 Z
3 8 9
Z1
6
INH
11
A
10
B
9
R2404
C
22k
7 8
5VA
D-8A
D-5A
D8VA
10 - 4
TX FM/AM/SSB:30mVp-p
IC2201
BU4053BCFV
16
14
12
X0 X
13
X1
15
2
Y0 Y
1
Y1
4 DTAF
5
Z0 Z
3
Z1
6
INH
11
A
10
B
9
C
7 8
W2202
D-5A
RX SG
MOD 88.5Hz ±0.75kHz Dev
400mVp-p
C2582
100p
8
11.3mS
3
1 FMTL
+
2
-
IC2472A
4
M5218AFP
TX,SSB
R2448
100mVp-p
10k
IC2441C IC2441D
1mS
NJM2058M NJM2058M
R2447
R2453
9 10k
8
13 6.8k
-
10 14 DMAF
-
+ 12
+
DTIF
R2388
10k
R2387 4
2
10k
8
6 - 1
7
- 3
+
5
+
11
IC2381B IC2381A
µPC4574G2 µPC4574G2
2.4Vp-p
200mVp-p
2V
DSP-A BOARD