Icom IC-7800 Service Manual page 194

MAIN UNIT (2)
BUS LINE1
+15V +15V
+15V
+8V +8V
+8V
+3R3V +3R3V
+3R3V
+5V +5V
+5V
-12V -12V
-12V
T8V T8V
C561 R566 L517
0.0047 120 10
C559 C560 R564
0.0047 39p 33k
C841
0.0047 C562 L524
c(from MAIN unit(3))
0.001 68n
Q507 TX : 10.7V
T8V
2SC4673 RX : 0V
TX : 0.74V
RX : 0V
C839
0.0047
D506
L513 L514
HSB88WS
617DB 617DB
R833
2.2k
L523
L512
0.15
LS-484B
C579 L529
7p 0.15
Q506
2SK882
T8V T8V
ALC ALC
d(from MAIN unit(3))
e(from MAIN unit(3)) R511 100 C516 0.001
R514 1k
IC503
L502 100 TA4107F
8 1
LO2 LO1
C521
L503 100 7 2
L501 GND VCC 0.1
6 3
100 IF2 RF2
R515 560
5 4
IF1 RF1
ALC ALC ALC
T8V T8V
1.22V FI501
R520 D501 C531
CFWS455D
39k MA77 0.0047
DRIV
I
FI502
C525 D502 C532
CFWS455IT
0.0047 MA77 0.0047
MAIN
I
Q501
UNIT R585 R525
3SK294
22k
2.2k
(1)
TX : 7.95V
RX : 1.2mV
TX : 4.01V
RX : 0V
+8V
MODS
IC501
NJM5534MD
1 8
VT VT/COMP
C501 R501 R503 R504
2 7
0.1 1k 1k 1k -I V+
3 6
+I OUT
4 5
V- COMP
-12V -12V
+15V +15V
TX36K
+8V +8V L290 EXCCL3225U
BUS LINE2
+3R3V
+5V
BUS LINE3
IC290
CD74HC4094M
IC330
1
STROBE
M62352AGP
2
1 20 DATA
VSS GND 3
MIGV 2 19 MODVB CP
4
AO3 AO2
Q0
DRIV 3 18 MODVA
5
AO4 AO1
POCV 4 17 MDAT Q1
AO5 DI 6
BNDM 5 16 MCK Q2
7
AO6 CLK
Q3
BNDS 6 15 ASTB1
8
AO7 LD
SATT 7 14 GND
AO8 DO
FANV 8 13
AO9 AO12
9 12
AO10 AO11
10 11
VDD VCC
IC331
M62352AGP
IC310
1 20 CD74HC4094M
VSS GND
AFGVS1 2 19
1
AO3 AO2
STROBE
AFGVS2 3 18
2
AO4 AO1 DATA
PHML1 4 17 3
AO5 DI
CP
PHML2 5 16
4
AO6 CLK
Q0
PHSL1 6 15 ASTB2 5
AO7 LD Q1
PHSL2 7 14 6
AO8 DO
Q2
AAFVA 8 13
7
AO9 AO12 Q3
AAFVB 9 12 MAMS 8
AO10 AO11 GND
10 11
VDD VCC
BUS LINE4
11 - 10
+15V
+8V
+3R3V
+5V
-12V
T8V
R576 C574
18 0.1
L525 L526
68n 68n
D601
TX : 9.72V MA77
C585 C587
RX : 0V
7p 10p TX : 14.5V
RX : 0V
L521
LR-489
R578
18
Q508
R567
2SC5501
18
L518 L519 L527
56n 0.1 0.15 L522
R574
LR-488
47 D603
MA77
C565 C567 C589
100p 47p 12p
FI503
FL-348 TXB2
L511 R552 C551 L510 L509
5
0.47 4.7 0.0047 LR-414 LR-414
4 1
GND IN
2 3
OUT GND
R554 R553
1k 150 D605
6
MA77
ALC
R540
15
D505
R545 L507 L508 R548
HSB88WS TXB3
5.6 LR-395 LR-358 5.6
R517
4.7k
D607
MA77
ALC
T8V
L505
LS-469
TXB4
C533 D503
0.0047 MA77
O
C535 D609
0.0047 MA77
Q504
2SK882
C534 D504
0.0047 MA77
O
Q503
UMH11N
3 4
Q502
DTC114EU
2 5 TXB5
+8V 1 6
D611
MODS
MA77
IC502
C581 C582
NJM5534MD
22p 22p
1 8
VT VT/COMP
R507 R508
2 7
1k 1k -I V+
3 6
+I OUT
TXB6
4 5
V- COMP
D613
R613
MA77
18
-12V
+15V
TX36K
TXB7
+3R3V
D615
MA77
IC291
TD62783AF
1 18 R290 10 MMUT
IN1 O1
2 17 R291 10 MCPS
IN2 O2
16 +3R3V 3 16 R292 10 MONS
VCC IN3 O3
15 DRES 4 15 R293 10 SSA TXB8
OE IN4 O4
14 5 14 R294 10 SSB
Q4 IN5 O5
13 6 13 R295 10 SMUT
Q5 IN6 O6
12 7 12 R296 10 TRVSM
Q6 IN7 O7
11 8 11
IN8 O8
Q7 D617
10 9 10
QS2 VS GND MA77
9
QS1
IC311
TD62783AF
1 18 R310 10 CROSS TXB9
IN1 O1
2 17 R311 10 MAFS
IN2 O2
D619
16 3 16 R312 10 PMIX
VCC IN3 O3 MA77
15 4 15 R313 10 SPON
OE IN4 O4
14 5 14 R314 10 A_AFA
Q4 IN5 O5
13 6 13 R315 10 B_AFA
Q5 IN6 O6 C745
12 7 12 R316 10 UNSB
Q6 IN7 O7 120p
11 8 11 R317 10
Q7 IN8 O8
10 9 10
QS2 VS GND
9
QS1
TXB10
+15V
+8V
+3R3V
+5V
-12V
T8V
C606 C610
180p 180p
L602 C607 C611 L604 D602
12 27p 27p 12 MA77
C602 C614
0.001 0.001
R601 100
C622 C626
39p 39p
L607 C623 C627 L609 D604
5.6 330p 330p 5.6 MA77
C618 C630
330p 330p
R602 100
C638 C642
15p 15p
L612 C639 C643 L614 D606
6.8 82p 82p 6.8 MA77
TXB0
C634 C646
390p 390p
R603 100
C654 C658
27p 27p
L617 C655 C659 L619 D608
3.3 120p 120p 3.3 MA77
C650 C662
150p 150p
R604 100
C670 C674
39p 39p
L622 C671 C675 L624 D610
2.7 33p 33p 2.7 MA77
C666 C678
220p 220p
TRVSM
R605 100
C686 C690
33p 33p
L627 C687 C691 L629 D612
1.8 33p 33p 1.8 MA77
h
C682 C694
68p 68p
R606 100
C702 C706
15p 15p
L632 C703 C707 L634 D614
1.5 22p 22p 1.5 MA77
C710
47p
EXRL1
FORV
C698
47p EXRL2
REFV
TRVI
FANV
R607 100
C718 C722
RTKI
10p 10p
IDL
SENI
L637 C719 C723 L639 D616
VDL
0.82 33p 33p 0.82 MA77
SEND
ALCL
ASND
C714 C726
THML
18p 18p
T8V
SQLAM
MR8V
CP495
SQLAS
R608 100 SR8V
CP496
SQLM
C734 C738
RSTBB
0.5p 0.5p
SQLS
RSTBA
L642 C735 C739 L644 D618
0.68 22p 22p 0.68 MA77
ASTB2
DULSA
ASTB1
C730 C742
DULSB
15p 15p
MSTB2
KEY
MSTB1
R609 100 MCK
LED1
L648 C749 C755 L650 D620
MDAT
0.61 2.5p 2.5p 0.61 MA77
LED0
VOXAFE
VOXAF
C759
CIVE
120p
CIV
R611 100
+15V
+8V
+3R3V
+5V
-12V
T8V
Q802
14.9V
2SB1119
Q803
R809 DTC114EU
1.5k
C836
5p TX : 14.0V
RX : 0V
R822
33k TX : 0V
R823 C823 L820 L821 L822 RX : 14.5V
47 1 27 47 56
C825 C828 C831
0.022 0.01 0.0033
R824
100
+15V
C819 5p
R831 22k
Explanatory notes
VOLTAGE LINE
TX LINE
TX : 2.90V
RX : 0V
D801 C802 L803
MA77 0.1 LR-494
C807 R817 R805
0.1 0 68
R818 C815
100 8p
MESUREMENT CONDITIONS
voltage at RX(no instrudion)
Q801 Q804
R804 TX : 13.7V
frequency : 14.1 MHz
2SC5551 UMH11N
mode : J3E(USB) 2.7k RX : 0V
1
ANT(RX) : no input
TX : 3.62V
(TX) : no modulation
RX : 0V
14.6V
SCOPE ATT : 0dB 2
Digital tester
range : input impedance
200mV : 100M 3
2V : 11M
20V,200V,1000V : 10M
+15V
D802 R813
1SV307 18
Q805
DTC114EU
14.6V
TRVSM
C352 0.1
0.8mV
R351 D351
100k MA2S111
Q351 14.8V
C845
2SK3018
0.1
R837
2.2k
Q806
Q808 Q809
2SC4081
DTA114EU DTC114EU
MONS
R353
10k
Q352 R841
2SC4081 68
+15V
J900 J940
R900 100 R960 100
R920 100 R940 100
R901 100 R961 100
R921 100 R941 100
R902 100 R962 100
R922 100 R942 100
R903 100 R963 100
R923 100 R943 100
R904 100 R964 100
R924 100 R944 100
EP905
R925 100 R945 100
R906 100 R966 100
R926 100 R946 100
EP907 R967 100
R927 100 R947 100
R908 100 R968 100
R928 100 R948 100
R909 100 R969 100
R929 100 R949 100
R910 100 R970 100
R930 100 R950 100
R911 100 R971 100
R951 100
R912 100 R972 100
R932 100 R952 100
R913 100 R973 100
R933 100 R953 100
R914 100 R974 100
R934 100 R954 100
R915 100 R975 100
R955 100
R916 100 R976 100
R936 100
R917 100 R977 100
R937 100 R957 100
R978 100
R958 100
R979 100
EP901
BUS LINE1
+15V
+15V
+8V
+8V
+3R3V
+3R3V
+5V
+5V
-12V
-12V
T8V
T8V
T8V
R826 D820
18 1SV307
+15V
TXB0
(to MAIN unit (3)) f
R811
10k
6
5
TX : 4.25V
4
RX : 0V
+15V
C814
1
MAIN
UNIT
(3)
+15V
SCK
DSPCK
SDAT
DSPR
SST1
DFRA
SPSO
DFXA
SST2
DX1A
NSQA
DFXS
VSQA
DFRS
RTDA
RX1S
TNDA
DRES
DFRB
FRWT
DX1B
DFRT
DFXB
DX1T
NSQB
DFXT
VSQB
DVOX
RTDB
DAVOX
TNDB
DSKY
SYNCIO
CTFL
METM
EPAD
METS
MUTEI
BUS LINE2