Icom IC-7851 Servise Manual page 159

MAIN UNIT (MAIN-6)
8 8 8 8
V+ V+ V+ V+
GND GND GND GND
4 4 4 4
R2320
4.3K
R2318 IC2371
2
C2317
4.3K 1
R2319
3
0
NJM2114M
IC2371
6
7
5
NJM2114M
C2318
VOXAF
/TAFIN
R2315
4.3K
R2313 IC2311
2
C2316
MAIN-3
1
4.3K
R2314
3
1 F93
0 NJM2114M
IC2311
6
7
5
NJM2114M C2315
TAFIN
1 F93
MAIN-1
MCLK24M
MCLK24M
6M_BCLK
6M_BCLK
96K_FRM
96K_FRM
/ACAL
/ACAL
DAR_MIC
DAR_MIC
DAX_TIF
DAX_TIF
DAX_USB
DAX_USB
DBX_USB
DBX_USB
R2334
2.2K
C2336
330P
R2333 IC2331
6
R2335
7
1 4.3K
5
100
NJM2114M
C2335
0.1
R2337
2.2K
C2338
330P
R2336 IC2331
2
R2338
1
1 4.3K
3
100
NJM2114M
C2337
0.1
R2327
2.7K
C2328
270P
R2326
6
IC2321
R2328
7
4.3K
5
100
NJM2114M
R2324
2.7K
C2326
270P
R2323
IC2321
2
R2325
1
4.3K
3
100 R2382
NJM2114M
C2325 47K
0.1 R2381
C2381
Q2381
L2SC4081
0.01 180
96K_FRM
DAX_USB
6M_BCLK
R2512
22K
C2511 R2511
Q2511
L2SC4081
0.01 220
96K_FRM
DBX_USB
6M_BCLK
R2542
22K
C2541 R2541
Q2541
L2SC4081
0.01 220
IC2301
C2345
1 30
VCOM AOUTR+
2 29
AINR+ AOUTR- 1 F93
3 28
AINR- AOUTL+
4 27
AINL+ AOUTL-
5 26
AINL- VSS2
6 25
VREF DVDD
7 24
VSS1 TVDD
8 23
AVDD SDFIL
9 22
P/S DEM0
10 21
MCLK PDN
11 20
LRCK DFS0
12 19
BICK CSN/DIF
13 18
SDTO CCLK/CKS1
14 17
SDTI CDTI/CKS0 C2355
15 16
OVFR/DZFR OVFL/DZFL
1 F93
AK4621EF
R2302
22
CP2301
SHORT
6.8K
R2411
R2423 R2424 R2425
C2425
10 F93 820 1.8K R2426
0
IC2411
16 1
22
SCK BCK
15 2
FMT DATA
14 3
MUTE LRCK
13 4
DEMP DGND
12 5
TEST NC
11 6
C2411 ZEROA VCC
10 7
VCOM VOUTL R2433 R2430
10 9 8
AGND VOUTR
0 10k
PCM1754DBQ
R2457
6.8K
R2441
C2455 R2453 R2454 R2455
1.8K R2456
10 F93 820
0
IC2441
22 16 1
SCK BCK
15 2
FMT DATA
14 3
MUTE LRCK
13 4
DEMP DGND
12 5
TEST NC
11 6
ZEROA VCC
C2441
10 7
R2463
VCOM VOUTL R2460
10 9 8
AGND VOUTR
0 10k
PCM1754DBQ
7
V+
GND
4
C2348
22P
R2346
2
6
R2344 R2345 680
3
IC2341
1K 1K
NJM5534MD C2367 22P
R2363
2
1.5K
6
3
R2364
IC2361
C2358
NJM5534MD
1.5K
22P
R2356
2
6
R2354 R2355 680
3
IC2351
1K 1K NJM5534MD
R2427
3.3K C2428
100P
MAIN-2
2
R2428
1
DAOUT_USB
3
470
IC2421
NJM2114M
MAIN-1
R2432
RAAGCV
100
IC2421
6 IC2501
7 5
3.8
VIN CTRL
5
GND
4
VOUT NB
NJM2114M
NJM2871BF05
5.0
3.3K
C2458 100P
2 IC2451 MAIN-2
R2458
1
DBOUT_USB
3
470
NJM2114M
MAIN-1
R2462
RBAGCV
100
IC2451
6
IC2502
5
7
3.8
VIN CTRL
5
GND
4
NJM2114M VOUT NB
NJM2871BF05
5.0
*: Refer to the PARTS LIST for the value and name of component.
9-16
MAIN-1
+8V
+5V
+3R3V
-8V
7 7
V+ V+
GND GND
4 4
MAIN-4
R2367
TXIF
100
8 8
V+ V+
GND GND
1 4 4
2
3
1
2
3