Icom IC-756proIII Service Manual page 98

A
PLL UNIT
5V
B
8V
C
D
E
MEASUREMENT CONDITIONS
VOLTMETER :10MΩ
OSCILLOSCOPE :20MHz 1MΩ 25pF
SUPPLY VOLTAGE :13.8V
DISPLAY :14.1MHz USB
R401 2k
R402 2k
R404 2k
R406 2k
1
VSS
2
SYSCLKO
3
R408 2k VDD
4
VDD
5
VSS
6
DA0
7
R410 2k DA1
8
DA2
9
DA3
10
VSS
11
R412 2k DA4
12
DA5
13
DA6
14
DA7
15
R414 2k VSS
16
VSS
17
DA8
18
DA9
19
R416 2k DA10
20
DA11
21
VDD
22
TE1
23
R418 2k TE2
24
TE3
25
VDD
R420 2k
R422 2k
R424 2k
IC402
TC7S04F
FI401
1
CFEC10.8MD11
C416 C417
0.1 0.1 W422
2
3
C418
0.1
C452
33p
C420
0.1
C455
150p
L452 D452
LB-343 HSM88AS
R432
47k
D453
HSM88AS
R441
Q402
100
2SC4081
C419 R431
0.0047 100
F
32MHz_REF
R492 L491 L492
180 0.68µH 0.82µH
C492 C494
100p 39p
R439
47k
Q403
2SC4081
C424 0.0047
C423 0.0047
75
ETCO0
74
ETCO1
73
ETCO2
72
VSS
71
ETCO3
70
ETCO4
69
VSS
68
ETCO5
67
ETCO6
66
ETCO7
65
VSS
64
VDD
63
IC401
Q4MA
SC-1246A
62
Q16MA
61
VSS
60
FCK
59
RC
58
REF_OSC
57
VDD
56
PDTRI
55
VSS
54
PD0
53
VDD
52
PD1
51
PD2
R442
1k
R447
1k
R427 1M
R430
10
5
R604 L601
33 10µH
4
EP451
MMZ1608Y102B
IC682
TA78L05F
8V 1LOB 5V PLLB
I 0
G
R455
180
Q451
2SK210
C461 5p
C456 R456 C463 R459
150p 47k 0.0047 15
Q452
2SC4081
C695
0.01
R461 R660 W455
82 15
10 - 13
5V
8V
C450 R502
0.1 560
L506
6 5 4
1812CS.
122XKBC
Q426
UMD3N
C501
0.0047
1 2 3
VB1S
L426
10µH
R522
33
6 5 4
L526
1812CS.
122XKBC
Q423
UMD3N
1 2 3
VB2S
L423
10µH
R552
270
6 5 4
L556
1812CS.
Q422
122XKBC
UMD3N
1 2 3
VB3S
ULDB
L422
10µH
R572
560
6 5 4
L576
Q421
1812CS.
UMD3N
122XKBC
1 2 3
VB4S
L421
10µH
PBFS
5V 5V
8V 8V
Q424 L424
UMD3N 10µH
1 6 PBFS
2 5
Q601
2SC4403
3 4
8V
L425
10µH
PBMT
R609 560
L481 W481
Q481
10µH
R481 2SC4081
R688
1k 82k
Q681
2SA1576
J681
L682
HF50ACC322513-B
R694 W692
1.8k
C680
IC681
1
LMX2306TM
1 16
FLO VP
2 15
CPO
VCC2
3 14 R680 10k ULPB
GND FO/LD
4 13 R687 1k PST4
GND
LE
5 12 R685 1k PDAT
FIN DATA
6 11 R686 1k PCK
FIN
CLOCK
7 10
VCC1
CE
8 9
OSCIN
GND
C681
0.0047
L505
1812CS. C503
122XKBC 0.0047 C506
1p
D502 KV1770S
C502 Q501
20p 2SK508
R503
560
D501 KV1770S
L525
1812CS. C523
122XKBC 0.0047 C526
1p
D522 KV1770S
C522 Q521
56P 2SK508
R523
470
D521 KV1770S
L555
1812CS. C553
122XKBC 0.01 C556
1p
C552 Q551
150p 2SK508
R553
560
L575
1812CS. C573
122XKBC 0.0047 C576
1p
C572 Q571
100p 2SK508
R573
560
R601 R575 C624 0.0047
1.8k 47
L627 L628
56n 56n
C626 0.1
IC620
C602 C620 R621 µPC1678G R623
39p 10
39p 10
1 8
IN VCC
2 7
GND GND
3 6
GND GND
4 5
Q651
GND OUT
DTA114EE
C611
0.0047
R651
2.7k
L651 L652 L653 C658
L603
47nH 56nH 82nH 82nH 56P
C605 C652 C654
7p 3p 2p
C607 D601 C655 D651
12p MA77 10p MA77
A
5V
B
8V
C
D
EP504
E
C507
0.0047
Q502
2SC4213
EP524
F
C527
0.0047
Q522
2SC4213
EP554
G
C557
0.0047
Explanatory notes
Q552
VOLTAGE LINE
2SC4213
EP574
H
C577
0.0047
Q572
2SC4213
5V
8V
EP621
MMZ1608Y102B
5V 1LOB
C650
0.0047
R661
4.7k
L655
4.7µH
R663
4.7k
C660 D661 C661 R653
56P 1SV307 0.0047 15
I
R652
D662
1SV307 270
Q661
R662
DTC114EE
100
J