Icom IC-7800 Service Manual Addendum page 539

SCOPE UNIT (2)
3.03V
L722 L721
3R3V
10µ 10µ
1.28V
R721 R720
10k 270
C727
Q720
0.0047 2SC4406 2.88V
0.75V L720
3R3V
10µ
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
150 0.0047 2SC4406
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
51
IC820
NC
50
AD9857AST
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
330µ 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
6
9
4A 3Y
4.57V 10 5 SST2
5Y 3A
11 4
5A 2Y
12 3 SDAT
6Y 2A
13 2
L802 6A 1Y
1
14 SCK
VCC 1A
330µ
3R3V
5V
CP722
CP721
R741 C760 L761 L762 L763
0.0047 0.27µ 0.33µ 0.39µ
0
C762 C766
68p 12p
C764
39p
C833 R855
10 560
6.02V
1.88V
L821
C821 C825
Q821
3.25V
10µ 2SK210
27p 100p
C829 R841
0.5p 10
L822
E526GN
1.27V
D40M
3R3V
5V
R767 C768 C770
270p 270p
0
R765
18
L825
L841
100µ
100µ
4.95V
Display ON: 5.32V
OFF: 7.68V
Q841
Q842
2SC4081
R846 2SC5226 C849
C846
0.0047
470 0.0047
R848 2.98V
2.58V
6.8k
Q872
DTC114EU
Display ON: 2.37V
OFF: 0.00V
L701
330µ
6.68V
3.69V
C701
C862 Q701
2SC4406 0.1
0.0047 D40M
R704 C703
3.17V
0.1
47
3R3V 3R3V
5V 5V
8V 8V
D40M
11 - 15
MESUREMENT CONDITIONS
Explanatory notes
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
200mV: 100MΩ
2V: 11MΩ
20V,200V,1000V: 10MΩ
S2LO
5.25V
Q843
2SC5226
R859 L851 L852
C851
S3LO
0.0047 33 0.1µ 0.12µ
C855
2.20V C853
33p 12p
SMUT
R856
8V
270
R858
100
R705
40MHz
SCOPE
150
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