Icom IC-7800 Service Manual Addendum page 317

Jul. 2008
SCOPE UNIT
SCOPE UNIT (1)
C
E Q31
DTC114EU
J1
C35 0.01
from RXPLL-A SCPA
unit J1301
R14 L32
150
SSA
F
Q11
DTC114EU
J2
C37 0.01
SCPB
from RXPLL-B
unit J1301
R18 L34
150
SSB
Q12
DTC114EU
J3
C21
from RXPLL-B SAD
unit J601
0.0047 C38 0.01
R35
4.57V
Q32
1k
DTC114EU
A B 7.90V 3.17V
J11 D
C22
from MAIN SCPT
unit J808
0.0047
Display ON: 0.0V
OFF: 6.67V
J4
AGND
SSA
SSB
SATT
SMUT R53 100 SMUT
+8V L57
T8V HF50ACC322513 T8V
AGND
AGND
+5V L59 HF50ACC322513
+3R3V L60 HF50ACC322513
to MAIN
-12V L52
unit J410
+3R3V_
-11.64V
+3R3V_
+3R3V_
AGND
SST2 R73 100 SST2
SPSO R74 100 SPS0
SST1 R75 100 SST1
SCK R76 100 SCK
SDAT R77 100 SDAT
DGND
SYNCIO
SYNCIO R72 100
3VH
FRWT R61 100
DXIS R62 100 DX1
FSR1
DFRS R63 100
FSX1
DFXS R64 100
SDR1 R65 100 DR1
CLKX1
DSPCK R66 100
DRES R71 100
DGND
SCOPE
UNIT (2)
SYNCIO
SYNCIO
SDAT
SDAT
SCK
SCK
SST1
SST1
SMUT
SMUT
SPS0
SPS0
SST2
SST2
RESET
RESET
40MHZ
40MHZ
D40M
D40M
S2LO
S2LO
S3LO
S3LO
+3R3VLP L58 HF50ACC322513 +3R3VL
+3R3VLP
+5VLP L55 HF50ACC322513
+5VLP
+8VLP L56 HF50ACC322513
+8VLP
GND
GND
SCOPE
UNIT (3)
RESET
RESET
RESET
RESET
CLKX1
CLKX1
DR1
DR1
FSX1
FSX1
DX1
DX1
FSR1
FSR1
3VH 3VH
3VH
D40M D40M
D40M
+5VLD L54
+5VLD
+3R3VL +3R3VL
+3R3VL
+2R5V +2R5V
+2R5V
+3R3V_ +3R3V_
+3R3V_
S3IF+
S3IF+
GND
GND
MAIN SUB
A 6.46V 0.0V
SCPA B 0.0V 6.47V
C 0.0V 5.68V
D 5.68V 0.0V
E 2.29V 14.55V
F 2.28V
14.55V
IC1
C1
0.0047
3 4 2.55V
C24
OUT2 VCONT2
SCPB
2 5
GND IN
1 6 D1
OUT1 VCONT1 0.0047
CPH5513
C3
1
C2
0.0047
2
0.0047
40MHZ
+8V_
IC31
3
OUT2 VCONT2
2
GND IN
1
OUT1 VCONT1
R38
+8V_ +8V_
4.7k
SSA
SSB
ATTV
TX: 7.99V
2.22V R36
RX: 0.0V
T8V
4.7k
T8V
AGC
3.17V
S2LO
+8V
7.19V
1.41V
C303
S3LO Q301
2SC4673
0.0047
0.67V
200KHz
SPS0
-10.3V -4.99V
SST2 IC2
R81
-12VL TA79L05F
-5VL
40MHZ
100
D40M
I O
G
S2LO
S3LO
D40M
+2R5V
+2R5V
S3IF+
68
C11
1p
L5
L13 39n L14
LS-484B
C43 82p C45 18p
D2
C9
CPH5513
0.0047
5 1 5
4 4
L2 C8 0.0047
3 2 3
Q1
2SC4081
L4
2.57V
R5
R11
RH03ADCJ4X
4.7k
R2 R4
8V
2.2k
1.5k
4.83V
L11
8V
4
5
6
4.68V
Q33
DTC114EU
TX: 0.00V
RX: 3.28V
AGC
S2LO
L203
LS-484B
D4
L302 L301 R207
HSB88WS
LR-395 LR-395
15
+8V
C301 R303
18p 18
L304
8V 8V
R403
R402
1k
1k
-5V -5V
IC401
0.0V
R412
10k
L401
C420 R411 R413
R404 R405
0.1 10k 270k
1k 1k
C421
1p
0.0V
L53
+5V
+2R5V
ATTV
AGC
S3IF+
L12
L6
0.99V 7.66V
LS-484B
C41 10p
L8
C15
LR-442
C14 0.0047
470p
L101
LR-395
C17
0.0047
C18 R12
5p 100
Q2
2SC5551 R9
1.12V 3.3k
8V
6.99V
C107
Q101 56p
C101
S2LO
2SC4673
0.0047
0.67V
1.33V
0.0V
8V
C207 5p
7.30V 7.25V
L202
R209
LS-484B
47k 0.0V
Q202
Q201
2SK882
2SK882
C204
0.0047
L204
8V
R414
10k
1.25V
R416
RH03ADCS5X
R418
C425 R417 R419
0.1 39k 12k 15
-5V
-5V
IC404
IC403
C430
1
R421
0
R422
10k
+5V +5V
+2R5V
ATTV
AGC
S3IF+
MESUREMENT CONDITIONS
voltage at RX(no instruction)
Explanatory notes
frequency: 14.1 MHz
mode: J3E(USB)
VOLTAGE LINE ANT(RX): no input
(TX): no modulation
SCOPE ATT: 0dB
Digital tester
range: input impedance
D101
L102
HSB88WS
LR-395
R109
18
8V
R106
18
L104
C109 120p
8V
L201
LS-471A
FI201
FL-357
4 1
GND IN L205
2 3
OUT GND
82n
8V
TO ADC IN
S3IF+
R429
IC405
NJM2904M
0
R435
0 R433
100k
R437
100k
ATTV
AGC
S3IF+