Icom IC-7800 Service Manual Addendum page 318

Jul. 2008
SCOPE UNIT (2)
3.03V
L722 L721
3R3V
1.28V
R721 R720
10k 270
C727
Q720
2SC4406
2.88V
0.0047
L720
0.75V
3R3V
C730
0.1
1
D13
2
D12
3
D11
4
D10
5
D9
6
D8
7
D7
8
DVDD
9
DVDD
10
DVDD
11
DGND
12
DGND
13
DGND
14
D6
15
D5
16
D4
17
D3
18
D2
19
D1
20
D0
C731
0.1
R726 1k
SPS0
R725 1k
SST1
R724 1k
SCK
R723 1k
SDAT
R737 1k
SYNCIO
RESET
5V
0.77V
1.68V
R811
C812
0.0047
10k
R813 C810
D40M Q810
2SC4406
150 0.0047
D40M
3R3V
C739 0.1
C738 0.1
60
DIFFCLKEN
59
AGND
58
AVDD
57
NC
56
AGND
55
PLL_FILTER
54
AVDD
53
AGND
52
NC
IC820 51
NC
AD9857AST 50
DAC_RSET
49
DAC_BP
48
C750
AVDD
47
0.01
AGND
46
IOUT
45
IOUT
44
AGND
43
AVDD
42
AGND C737 0.1
41
NC
C736
0.1
RESET
L801 R806 R808
4.7k 22k
IC801
LMX2306TM
1 16 4.55V
FLO VP
2 15
CPO VCC2
3 14
GND PO/LD
4 13
GND LE
5 12
FIN DATA
6 11
FIN CLOCK
7 10
VCC1 CE
8 9
OSCIN GND
IC803
TC74HCT7007AF
8 7
4Y GND
9 6
4A 3Y
4.57V
10 5 SST2
5Y 3A
11 4
5A 2Y
12 3 SDAT
6Y 2A
13 2
L802 6A 1Y
14 1 SCK
VCC 1A
3R3V
5V
CP722
CP721
R741 L761 L762 L763
C760
0.0047
0
C762 C766
68p C764 12p
39p
C833 R855
560
10
6.02V
1.88V
L821
C821 C825 Q821
3.25V
2SK210
27p 100p
C829 R841
0.5p 10
L822
E526GN
1.27V
D40M 0.0047
3R3V
5V
Explanatory notes
R767 C768 C770
270p 270p
0
R765
18
L825
L841
4.95V
Display ON: 5.32V
OFF: 7.68V
Q841
Q842
2SC4081
2SC5226
R846 C846 C849
Q843
2SC5226
0.0047 0.0047
470
C851
R848 2.98V
0.0047
2.58V
6.8k
Q872
DTC114EU
Display ON: 2.37V
OFF: 0.00V
L701
6.68V
3.69V
R705
C701
Q701
C862
2SC4406
0.1
150
D40M
R704 C703
3.17V
47 0.1
3R3V 3R3V
5V 5V
8V 8V
D40M
69
MESUREMENT CONDITIONS
voltage at RX(no instruction)
frequency: 14.1 MHz
mode: J3E(USB)
VOLTAGE LINE ANT(RX): no input
(TX): no modulation
SCOPE ATT: 0dB
Digital tester
range: input impedance
S2LO
5.25V
L851
R859 L852
S3LO
33
C855
2.20V C853
33p
12p
SMUT
R856
8V
270
R858
100
40MHz
SCOPE
UNIT (1)
S2LO
S3LO
3R3V
+3R3VLP
5V
+5VLP
8V
+8VLP
GND
GND
SMUT
SMUT
SPS0
SPS0
SDAT SDAT
SCK
SCK
SST1
SST1
SYNCIO
SYNCIO
SST2 SST2
RESET
RESET
40MHz
40MHZ
D40M