Icom IC-7400 Service Manual page 60

SECTION 9 BOARD LAYOUTS
• S-LOGIC UNIT
(TOP VIEW)
POWER
TUNER ATT
NR NOTCH
TRANSMIT
NR A/NOTCH
AF RF/SQL
MIC GAIN RF PWR CW PITCH
KEY SPEED
2 22
J2
• RF UNIT
(TOP VIEW)
1 21
P261
2IF
to MAIN unit J250
P2
HRX
from CTRL unit J2
P1
YGR
from PA unit J1
P601
VRX
from PA unit J601
CALL
P.AMP/ATT VOX/BK-IN MONITOR
NB
2
J1001
to MAIN
1 2
unit J100
J1601
to MAIN
unit J400
1
9 - 1
• PA UNIT
(TOP VIEW)
J201
V-B2
3
to VARISTOR-C
GND
board
1 V-B1
J5
PPWS
30
PDRS 29
PFSB
PMDT
PMCK
P5V
P5V
PH5V
THML
P8V
P8V
GND
PT8V
GND
PVRF
PVFR
GND
PGND
PICL
PICH
P14A
P14A
P14V
P14V
P14V
P14V
P14V
P14V
2 P14V
PHV 1
to MAIN
unit J120
LOCK/SPCH
J21 J22
1 DRI1 1 GND
DRI1 GND
GND DRO1
4 GND 4 DRO1
to DRV board to DRV board
J23 J24
1 GND 1 DRO2
GND DRO2
DRI2 GND
4 DRI2 4 GND
to DRV board to DRV board
22
P1
YGR
to RF unit J151
to MAIN
unit J160
21
to FILTER
unit EP5
J202
P601
to VARISTOR-D VRX
board
1 3
Q201
Q202
Q6
Q5
J101 J102
to VARISTOR-A to VARISTOR-B
board board
to FILTER
unit EP4
1 3 3 1
The combination of top side and bottom side of this
page shows the actual confi guration of P.C. board.
to RF unit J121