Icom IC-7800 Service Manual Addendum page 243

Aug. 2008
PA200W BOARD
PA200W BOARD
TX: 14.67V
R107
RX: 15.01V
1k
TX: 3.42V
RX: 0V
Q101
J1 RD01MUS1
R102
C102
from MAIN PAI
unit J801
0.001
15
TX: 0.93V
RX: 0V
GND
EP502
GND
GND
GND
+48HV
+48V
+48V
1 NC
EP501
7 NC
2 H8V
+48HV
8 GND
3 H8V
to DC-DC 9 GND
unit W1 4 C15V
10 GND
5 C15V
11 GND
6 LG_PWR
12 GND
REG UNIT
C301
0.1
TX: 14.63V
C111 R202
RX: 15.06V
0.001 560
TX: 4.09V
C112
RX: 0V
L202
0.1 LR-475
Q201
PD55003
R201
1
TX: 0.77V
RX: 0V
+15V_ +15V_
Explanatory notes
VOLTAGE LINE
TX LINE
+15V_
48.1V
82
L307
C311 R307
R312
TX: 4.78V
RX: 0V
0.0068 100 100
C401 R401
12
0.68
Q301
SD2918 R402
12
TX: 48.0V
R403
RX: 0V
12
L306
LR-474
R404
12
R405
C303 12
C402 R406
0.1
12
0.68
L304
EXC-ELDR25C
R301
20k
L305
EXC-ELDR25C
+48HV
L303
R3
STS-40
C16
C15
0.0047
0.0047
+48HV +48HV
2.87V
THL
3V
+15V_
R6 1k
R7 1k
TX: 7.95V
RX: 0V
7.96V IC2
TA78L08F
Q1
2SB1119
O
C8
+48HV
0.0047
TX: 7.96V
RX: 7.22V R2
10k
TX: 7.66V
RX: 0V
Q2
DTC114EU
R425
2k
R407
10k R423
1.5k
R416
15
C415
D403
1SS301
0.68
R418
18
Q401
SD2931
48.0V
TX: 2.59V
RX: 0V
D401
1SS301
L403
LR-296
D402
1SS301
TX: 2.58V
RX: 0V
Q402
SD2931 48.0V
R420
15
C416
D404
1SS301
0.68
R422
18
R410
10k R424
1.5k
R426 R521 R522
CP5
2k CP4 W501 0.01 0.01
R5
EP503
2.2k
+48HV
THL L1
L2
L3
L6
+15V_ +15V_ L7
15.06V
+15V_
I
G
J401
PAO to FILTER
unit J901
C417
0.1
L404
LR-95
C418
0.1
C419
0.1
C420
0.1
R523
0.01
+48HV
+48HV
J2
THML
IDH
to MAIN
IDL
unit J430
PAT8
+15V
J5
+15V
+15V
to DC-DC
GND
unit J5
GND
MESUREMENT CONDITIONS
voltage at RX(no instruction)
frequency: 14.1 MHz
mode: J3E(USB)
ANT(RX): no input
(TX): no modulation
Digital tester
range: input impedance