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Icom IC-7400 Service Manual

Icom IC-7400
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3 - 1
SECTION 3 DISASSEMBLY AND OPTION INSTALLATIONS
Opening the transceivers case
Follow the case and cover opening procedures shown here
when you want to install an optional unit or adjust the internal
units, etc.
CAUTION: DISCONNECT the DC power cable from the
transceiver before performing any work on the transceiver.
Otherwise, there is danger of electric shock and/or equip-
ment damage.
q Remove the 2 screws from the left side of the transceiver
to remove the carrying handle as shown at right.
w Remove the 6 screws from the top of the transceiver and
the 6 screws from the sides, then lift up the top cover.
e Turn the transceiver upside down.
r Remove 6 screws from the bottom of the transceiver, then
lift up the bottom cover.
UT-102 VOICE SYNTHESIZER UNIT
The UT-102 announces the accessed readout’s frequency,
mode, etc. (S-meter level can also be announced) in a clear,
electronically-generated voice, in English (or Japanese).
Push [LOCK/SPCH] for 1 sec. to announce the frequency,
etc.
q Remove the top and bottom covers as shown above.
w Remove the protective paper attached to the bottom of the
UT-102 to expose the adhesive strip.
e Plug UT-102 into J1920 on the MAIN unit as shown in the
diagram at right.
r Adjust the trimmer, SPCH LVL: R1925 on the MAIN unit, to
set the speech level if desired. Refer to the illustration at
right.
t Return the top and bottom covers to their original positions.
MAIN unit
UT-102
J1920
R1925

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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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