Icom IC-756proIII Service Manual page 72

SECTION 8 BOARD LAYOUTS
• BPF-A BOARD
(TOP VIEW)
V 0 V 5 V 1 0 V 1 5 V 2 0 V 2 5 V 3 0 V 3 5 V 4 0 V 4 5
J 8 0 3
( R F B )
• DSP-A BOARD
(TOP VIEW)
V0 V5 V10 V15 V20 V25 V30 V35 V40 V45
L2401 L2402
C2461
IC2461
R2389
C2573
R2388
L2461
IC2472
C2574
C2572
IC2381
R2575
D2373
R2580 C2582 R2582
C2387
IC2471
C2581 R2581 R2583
R2394
R2579
W2472
C2395
C2480 C2571
R2479 C2474
R2392
R2380
C2479
R2371 C2373
R2482 IC2473
R2351
C2378
Q2213
R2377
IC2441 C2478 C2367
C2286 C2375
R2281
C2507
R2373
R2227 C2374
C2284 DEV
W2505
C2370
R2442 2229
R2227
C2505 R2452 R2423 IC2346
C2445
W2504
IC2302
R2229
IC2281
C2311
GND GND
R2421
DTIF DRI F
GND D5 VA C2262 C2442
C2261 R2256
GND D5 VA C2263
R2219
C2281
GND D5 VA
GND DMA F C2211
R2293 IC2211
GND GND
AG C DT AF
C2508 C2301 Q2211
GND DRA F
C2308 R2217 R2216 C2213
- 8V GND R2215
C2309
R2257
- 8V GND
C2604
Q2322 R2323
- 5V GND
C2606 C2322
- 5V GND C2310
R2307
8V FMTL
8V GND C2601
C2307
R2602 R2601
C2321 IC2321
C2607
R2329
C2608
C2509 C2511
C2613
C2512
W2511 C2611 C2610
C2612
W2510 W2509
C2609
W2322
8 - 1
V 0 V 5 V 1 0 V 1 5 V 2 0 V 2 5
L
R 3 4 4 0
R 3 4 9 0
V 5 0 V 5 5
Q 3 4 2 0
C 3 4 5 0
C 3 4 6 0
J 8 0 4
( R F B )
C 3 4 7 0
Q 2 4 4 0 Q 2 4 3 0
Q 3 4 3 0
L 2 4 4 0
R 2 4 3 0
C 2 4 0 1
L 2 4 7 0
R 2 4 4 1
C 2 4 3 1
C 2 4 2 2
C 2 4 8 0
R 2 4 5 0 R 2 4 3 1
R 2 4 4 0
D 2 4 2 0
( R F B )
C 2 4 7 0
J 8 0 7
D 3 4 2 0
V50 V55 V60 V65 V70 V75 V80 V85 V90 V95 V100 V105
C2041
C2033
C2043
C2476
C2044
C2404 C2042
C2353
C2021 C2020 C2019 C2018 C2017
C2025 C2024 C2023 C2022
C2384 R2374 C2510
C2376
C2377 R2375
C2358 C2356
X2351
R2360 R2358
R2357
C2351 C2352
R2356
R2366 R2353
C2372
IC2353
IC2001
C2361
R2354
R2372
C2362
R2347 C2349
R2364 C2371
R2020
IC2345
R2014
R2015
R2016
R2017
R2018
R2019
C2341
C2007 C2008 R2001
C2001 C2002
R2346 C2343 R2349
C2066
R2203 W2072
C2201 C2342
IC2072
C2065
R2064 C2062
C2340 C2346 R2344
R2202 C2202
C2603 C2331
R2603 R2604
R2328
V 3 0 V 3 5
• PREAMP BOARD
4 3 0 2
(TOP VIEW)
R 3 4 5 0
C 3 4 4 0
R 3 4 7 0
C 3 4 9 0
L 3 4 1 0
C 3 4 1 0 R 3 4 1 0
Q 3 4 1 0
L 4 2 0 5
L 2 4 0 1
D 1 4 1 0
R 1 4 1 0
R 1 4 2 0
( R F B )
D 1 4 2 0
L 1 4 1 0
C 1 4 1 0
V110 V115 V120 V125
A
R2523
C2502
C2501
C2016 C2034
C2015
A GRS 3R3V_d
C2014
R2013 GND 3R3V_d
C2035
R2012
M5V_d GND
R2011
GND NSQO
R2010
R2009 DSDR DPGI
R2008
NC MODS
R2007 NC FMNS
R2006
MCK CALS
DSFW AC KS
MD AT DSRS
DSFR AM S
C2524
C2011
CTFL TXS
C2514
R2005 RT DT MSL1
R2004
GND DSKY
R2003
R2002 GND GND
C2506
R2062 C2093
C2091
C2354
C2052
IC2061
C2101
C2063
R2053 R2054
C2054
C2055
Ve r tical
• PHONE BOARD
(TOP VIEW)
• KEY BOARD
(TOP VIEW)
Ho ri z ontal
ELEC-KEY
• TEN-KEY BOARD
(TOP VIEW)
Ve r tical
• MODE BOARD
(TOP VIEW)
Ho ri z ontal
PHONES