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Icom IC-7400 Service Manual

Icom IC-7400
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5 - 11
ADJUSTMENT MODEcontinued
TX
ADJUSTMENT
RX
ADJUSTMENT
ADJUSTMENT ADJUSTMENT CONDITION DISPLAY OPERATION
Connect a 100 or 25 dummy
load to [ANT144M] connector.
Connect an SSG to [ANT1] con-
nector.
Set an SSG as:
Frequency : 14.151500 MHz
Level :
50 µV (73 dBm)
and OFF
Modulation : OFF
Connect an AC millivolt meter to
[EXT SP] connector with an 8
load.
Receiving
Set an SSG as :
Level : OFF
Receiving
Set an SSG as :
Level :
50 µV (73 dBm)
Modulation : OFF
Receiving
Set an SSG as :
Level :
32 mV (17 dBm)
Modulation : OFF
Receiving
11
12
13
14
15
16
1
2
3
4
5
Push [F5 (
SET)] to set and to step
next.
Push [F5 (SET)] to set and to step
next.
Push [F5 (SET)] to set and to step
next.
Push [F5 (SET)] to set and to step
next.
Push [F5 (SET)] to set and to step
next.
Push [F5 (
SET)] to set, then push
[F2] to return the opening display.
Push [F2 (RX)] to enter the TX
adjustment.
Set the RX total gain to 30 dB level
difference between SSG ON and
OFF using [MAIN DIAL]. Then push
[F5 (SET)] to store into memory, and
to step next.
Push [F5 (SET)] to store the S0
level into memory, and to step next.
NOTE: While RX METER adjust-
ment, NEVER change the connected
SSGs level until transceiver emits
Pi Pi and changes indication.
Push [F5 (
SET)] to store the S9
level into memory, and to step next.
Push [F5 (SET)] to store the S9+60
level into memory, and to step next.
TX RX 1.40-0
chk
SET
SWR 144M-1
chk
SET
SWR HF/50M
chk
SET
DRIVE 144M
chk
SET
DRIVE HF/50M
chk
SET
ALC
chk
SET
SWR 144M-2
chk
SET
Total Gain
D163E 0.70-0
chk
SET
S0 Level
chk
SET
S9 Level
chk
SET
S9+60 Level
*This output level of a standard signal generator (SSG) is indicated as SSGs open circuit.

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Icom IC-7400 Specifications

General IconGeneral
Frequency Range TX1.8-54 MHz
Frequency Range RX0.03-60 MHz
ModesSSB, CW, RTTY, AM, FM
Output Power100W (HF/50MHz), 50W (144MHz)
Receiver TypeTriple conversion superheterodyne
Antenna ConnectorSO-239
IF RejectionMore than 70 dB
Supply Voltage13.8 V DC ±15%
Current Drain RX1.5 A
Image RejectionMore than 70 dB
Audio Output Power2 W
Current Drain TX20 A
Sensitivity0.13 μV (SSB/CW)
SelectivitySSB: 2.4 kHz

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