Icom IC-7800 Service Manual Addendum page 225

Aug. 2008
MAIN UNIT (2)
BUS LINE1
+15V
+15V
+8V
+8V
+3R3V
+3R3V
+5V
+5V
-12V
-12V
T8V
C561
0.0047
C559 C560 R564
0.0047 39p 33k
C841
0.0047
c(from MAIN unit(3))
Q507
T8V
2SC4673
TX : 0.74V
RX : 0V
C839
0.0047
D506
L513
HSB88WS
617DB
R833
2.2k
L523
L512
0.15
LS-484B
C579 L529
7p 0.15
T8V T8V
ALC ALC
d(from MAIN unit(3))
R511 100 C516
e(from MAIN unit(3))
R514 1k
IC503
L502 100 TA4107F
8
LO2
L503 100
7
GND
L501
6
100 IF2
R515 560
5
IF1
ALC ALC ALC
T8V
1.22V
R520
39k
DRIV
C525
0.0047
MAIN
Q501
UNIT R585
R525
3SK294
22k
2.2k
(1)
TX : 7.95V
RX : 1.2mV
TX : 4.01V
RX : 0V
+8V
MODS
C501 R501 R503 R504
0.1 1k 1k 1k
-12V
+15V
+8V
+8V
BUS LINE2
+5V
BUS LINE3
IC330
M62352AGP
1 20
VSS GND
MIGV 2 19 MODVB
AO3 AO2
DRIV 3 18 MODVA
AO4 AO1
POCV 4 17 MDAT
AO5 DI
BNDM 5 16 MCK
AO6 CLK
BNDS 6 15 ASTB1
AO7 LD
SATT 7 14
AO8 DO
FANV 8 13
AO9 AO12
9 12
AO10 AO11
10 11
VDD VCC
IC331
M62352AGP
1 20
VSS GND
AFGVS1 2 19
AO3 AO2
AFGVS2 3 18
AO4 AO1
PHML1 4 17
AO5 DI
PHML2 5 16
AO6 CLK
PHSL1 6 15 ASTB2
AO7 LD
PHSL2 7 14
AO8 DO
AAFVA 8 13
AO9 AO12
AAFVB 9 12 MAMS
AO10 AO11
10 11
VDD VCC
BUS LINE4
+15V +15V
+8V +8V
+3R3V +3R3V
+5V +5V
-12V -12V
T8V T8V
R566 L517
120 10
R576 C574
18 0.1
L525 L526
68n 68n
C562 L524 TX : 9.72V
C585 C587
RX : 0V
0.001 68n 7p 10p
TX : 14.5V
RX : 0V
L521
LR-489
TX : 10.7V R578
RX : 0V 18
Q508
R567
2SC5501
18
L518 L519 L527
56n 0.1 0.15
L522 R574
LR-488 47
L514 C565 C567 C589
617DB 100p 47p 12p
FI503
FL-348
L511 R552 C551 L510 L509
5
0.47 4.7 0.0047 LR-414 LR-414
Q506 4 1
GND IN
2SK882 2 3
OUT GND
R554 R553
1k 150
6
ALC
R540
15
0.001
D505
R545 L507 L508 R548
HSB88WS
5.6 LR-395 LR-358 5.6
1
LO1 C521 R517
2
VCC 0.1 4.7k
3
RF2
4
RF1
ALC
T8V T8V
L505
LS-469
FI501
D501 C531 C533 D503
CFWS455D
MA77 0.0047 0.0047 MA77
I O
C535
0.0047
Q504
2SK882
FI502
D502 C532 C534 D504
CFWS455IT
MA77 0.0047 0.0047 MA77
I O
Q503
UMH11N
3 4
Q502
DTC114EU 2 5
+8V 1 6
MODS
IC501 IC502
C581 C582
NJM5534MD NJM5534MD
22p 22p
1 8 1 8
VT VT/COMP VT VT/COMP
R507 R508
2 7 2 7
-I V+ 1k 1k -I V+
3 6 3 6
+I OUT +I OUT
4 5 4 5
V- COMP V- COMP
-12V -12V
+15V +15V
TX36K TX36K
L290 EXCCL3225U
+3R3V +3R3V
IC291
TD62783AF
IC290 1 18 R290 10 MMUT
IN1 O1
CD74HC4094M
2 17 R291 10 MCPS
IN2 O2
1 16 +3R3V 3 16 R292 10 MONS
STROBE VCC IN3 O3
2 15 DRES 4 15 R293 10 SSA
DATA OE IN4 O4
3 14 5 14 R294 10 SSB
CP Q4 IN5 O5
4 13 6 13 R295 10 SMUT
Q0 Q5 IN6 O6
5 12 7 12 R296 10 TRVSM
Q1 Q6 IN7 O7
6 11 8 11
Q2 Q7 IN8 O8
7 10 9 10
Q3 QS2 VS GND
8 9
GND QS1
IC311
TD62783AF
IC310 1 18 R310 10 CROSS
IN1 O1
CD74HC4094M 2 17 R311 10 MAFS
IN2 O2
1 16 3 16 R312 10 PMIX
STROBE VCC IN3 O3
2 15 4 15 R313 10 SPON
DATA OE IN4 O4
3 14 5 14 R314 10 A_AFA
CP Q4 IN5 O5
4 13 6 13 R315 10 B_AFA
Q0 Q5 IN6 O6
5 12 7 12 R316 10 UNSB
Q1 Q6 IN7 O7
6 11 8 11 R317 10
Q2 Q7 IN8 O8
7 10 9 10
Q3 QS2 VS GND
8 9
GND QS1
64
+15V
+8V
+3R3V
+5V
-12V
T8V
C606 C610
180p 180p
D601 L602 C607 C611 L604 D602
MA77 12 27p 27p 12 MA77
C602 C614
0.001 0.001
R601 100
C622 C626
39p 39p
D603 L607 C623 C627 L609 D604
MA77 5.6 330p 330p 5.6 MA77
C618 C630
330p 330p
TXB2 R602 100
C638 C642
15p 15p
D605 L612 C639 C643 L614 D606
MA77 6.8 82p 82p 6.8 MA77
C634 C646
390p 390p
TXB3 R603 100
C654 C658
27p 27p
D607 L617 C655 C659 L619 D608
MA77 3.3 120p 120p 3.3 MA77
C650 C662
150p 150p
TXB4 R604 100
C670 C674
39p 39p
D609 L622 C671 C675 L624 D610
MA77 2.7 33p 33p 2.7 MA77
C666 C678
220p 220p
TXB5 R605 100
C686 C690
33p 33p
D611 L627 C687 C691 L629 D612
MA77 1.8 33p 33p 1.8 MA77
C682 C694
68p 68p
TXB6 R606 100
C702 C706
15p 15p
D613 R613 L632 C703 C707 L634 D614
MA77 18 1.5 22p 22p 1.5 MA77
C710
47p
C698
47p
TXB7
R607 100
C718 C722
10p 10p
D615 L637 C719 C723 L639 D616
MA77 0.82 33p 33p 0.82 MA77
C714 C726
18p 18p
CP495
TXB8 R608 100
CP496
C734 C738
0.5p 0.5p
D617 L642 C735 C739 L644 D618
MA77 0.68 22p 22p 0.68 MA77
C730 C742
15p 15p
TXB9 R609 100
D619 L648 C749 C755 L650 D620
MA77 0.61 2.5p 2.5p 0.61 MA77
C745 C759
120p 120p
TXB10 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
RX : 14.5V
R823 C823 L820 L821 L822
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
TXB0
TX : 2.90V
RX : 0V
D801 C802 L803
MA77 0.1 LR-494
C807 R817
0.1 0
R818 C815
100 8p
MESUREMENT CONDITIONS
voltage at RX(no instrudion) Q801 Q804
frequency : 14.1 MHz R804 TX : 13.7V
2SC5551 UMH11N
mode : J3E(USB) 2.7k RX : 0V
ANT(RX) : no input 1
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 TRVSM
C352 0.1
0.8mV
R351 D351
100k MA2S111
Q351 14.8V
C845
2SK3018
0.1
R837
2.2k
h Q806
Q808 Q809
2SC4081 DTA114EU DTC114EU
R353
10k
R841
Q352
2SC4081 68
+15V
J900 J940
EXRL1 R900 100 R960 100
FORV R920 100 R940 100
R961 100
EXRL2 R901 100
REFV R921 100 R941 100
TRVI R902 100 R962 100
FANV R922 100 R942 100
RTKI R903 100 R963 100
IDL R923 100 R943 100
SENI R904 100 R964 100
VDL R924 100 R944 100
SEND EP905
ALCL R925 100 R945 100
ASND R906 100 R966 100
THML R926 100 R946 100
T8V EP907 R967 100
SQLAM R927 100 R947 100
MR8V R908 100 R968 100
SQLAS R928 100 R948 100
SR8V R909 100 R969 100
SQLM R929 100 R949 100
RSTBB R910 100 R970 100
SQLS R930 100 R950 100
RSTBA R911 100 R971 100
R951 100
ASTB2 R912 100 R972 100
DULSA R932 100 R952 100
ASTB1 R913 100 R973 100
DULSB R933 100 R953 100
MSTB2 R914 100 R974 100
KEY R934 100 R954 100
MSTB1 R915 100 R975 100
R955 100
MCK R916 100 R976 100
LED1 R936 100
MDAT R917 100 R977 100
LED0 R937 100 R957 100
VOXAFE R978 100
VOXAF R958 100
CIVE R979 100
CIV EP901
BUS LINE1
+15V
+15V
+8V
+8V
+3R3V
+3R3V
+5V
+5V
-12V
-12V
T8V
T8V
T8V
R826 D820
18 1SV307
+15V
TXB0
R805
68
(to MAIN unit (3)) f
R811
10k
6
5
4 TX : 4.25V
RX : 0V
+15V
C814
1
MAIN
UNIT
(3)
MONS
+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