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Icom IC-718 - Service Manual

Icom IC-718
54 pages
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S-13701MZ-C1
© 2000 Icom Inc.
6-9-16, Kamihigashi, Hirano-ku, Osaka 547-0002, Japan
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HF TRANCEIVER
iC-718
iC-718

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Questions and Answers

  • J
    Jacqueline ArmstrongSep 18, 2025
    What to do if no sounds come from the Icom Transceiver speaker?
    • P
      Pamela EvansSep 18, 2025
      If you're not getting any sound from your Icom Transceiver's speaker, check the following: the volume level may be too low (rotate [AF] clockwise), the squelch might be closed (rotate [RF/SQL] to around the 10 o’clock position to open it properly), or the transceiver could be in transmitting mode (turn off the transmit mode).
  • J
    johnsonmichaelAug 25, 2025
    Why doesn't programmed scan start on my Icom Transceiver?
    • D
      David MyersAug 25, 2025
      Programmed scan may not start on your Icom Transceiver if the same frequencies have been entered in scan edge memory channels P1 and P2. To fix this, enter different frequencies in Scan Edge memory channels P1 and P2.
  • R
    Rebecca SmithAug 25, 2025
    Why doesn't memory scan start on my Icom IC-718 Transceiver?
    • D
      Douglas CombsAug 26, 2025
      Memory scan won't start on your Icom Transceiver if fewer than two memory channels have been entered. Make sure to enter two or more memory channels.
  • S
    Sheila FoxAug 27, 2025
    What to do if the displayed frequency does not change when rotating the main dial on Icom IC-718?
    • S
      Shane ChambersAug 27, 2025
      If the displayed frequency on your Icom Transceiver doesn't change when rotating the main dial, it could be due to the dial lock function being activated (push [LOCK] to deactivate it), a Quick Set mode screen being selected (push [SET] to exit the Quick Set mode), or the internal CPU malfunctioning (reset the CPU).
  • L
    Lauren StevensonSep 23, 2025
    Why is it impossible to transmit with my Icom IC-718?
    • H
      hrogersSep 23, 2025
      Transmitting may be impossible with your Icom Transceiver if the operating frequency is outside the selected ham band. To resolve this, set the frequency within the selected ham band.
  • M
    michaelmooreSep 23, 2025
    Why is receive audio distorted on my Icom IC-718?
    • O
      Omar CherrySep 23, 2025
      Distorted receive audio on your Icom Transceiver can be caused by several factors: * The operating mode is not selected correctly (select the correct operating mode). * The IF SHIFT function is activated (rotate SHIFT to the center position). * The Noise blanker function is activated (push [NB] to turn OFF the function). * The preamp is activated (push [P.AMP] to turn OFF the function). * If installed, the Noise Reduction function is activated and the [NR] control is set too high (set the [NR] control for maximum readability).
  • J
    Jacqueline RiddleSep 10, 2025
    Why is the output power too low on my Icom IC-718 Transceiver?
    • T
      Tabitha PearsonSep 12, 2025
      If the output power of your Icom Transceiver is too low, it could be due to several factors: the [RF POWER] may be set too low, so adjust it to a suitable position. Also, the [MIC GAIN] might be set too low, so adjust that as well. Ensure you have selected an antenna suitable for the operating frequency and that the antenna is properly tuned by pushing [TUNE] for 2 seconds to manually tune it.
  • J
    Justin SalinasSep 12, 2025
    Why are transmitted signals distorted on my Icom Transceiver?
    • G
      garciachristopherSep 12, 2025
      Distorted transmitted signals from your Icom Transceiver may be due to the [MIC GAIN] being set too high; adjust it to a suitable position. Also, the [COMP] function may be activated; turn it OFF.
  • K
    knightbrianSep 4, 2025
    Why is transmitting impossible on my Icom Transceiver?
    • A
      Anthony MorrisSep 4, 2025
      If transmitting is impossible with your Icom Transceiver, ensure that the operating frequency is set to a ham band.
  • N
    nicholaswhiteSep 1, 2025
    How to resolve distorted transmitted signals on my Icom IC-718 Transceiver?
    • D
      dhillSep 1, 2025
      If the transmitted signals from your Icom Transceiver are distorted, first, check the [MIC GAIN] and set it to a suitable position. If the [COMP] function is activated, turn it off.

Summary

Introduction and Safety Information

Danger and Safety Precautions

Important safety warnings and precautions to prevent damage or injury.

Repair and Servicing Notes

Essential guidelines and precautions for servicing and repairing the transceiver.

Specifications

Receiver Specifications

Detailed receiver specifications including sensitivity, selectivity, and audio output.

Transmitter Specifications

Detailed transmitter specifications including modulation, output power, and emissions.

Circuit Descriptions

Receiver Circuitry Details

Detailed description of the IC-718's receiver circuits, including RF, IF, and mixer stages.

Transmitter Circuitry Details

Detailed description of the IC-718's transmitter circuits, including microphone, modulator, and RF stages.

Phase Locked Loop (PLL) and Logic Circuits

Description of PLL and Logic circuits for frequency control and operation.

Adjustment Procedures

Preparation for Servicing

Required test equipment and connection setup for transceiver adjustments.

PLL Circuit Adjustments

Procedures for adjusting the Phase Locked Loop (PLL) circuit parameters.

Transmitter Adjustments

Detailed adjustments for transmitter gain, power, carrier, and modulation.

Receiver Adjustments

Procedures for adjusting receiver total gain and noise blanker sensitivity.

Semiconductor Information

Block Diagram

Wiring Diagram

Voltage Diagram

Icom IC-718 Specifications

General IconGeneral
Input voltage13.8 V
Output power100 W
Frequency range0.5 - 1.799999 MHz
Channels quantity101 channels
Compatible productsAH-2B; AH-4; AH-710; AT-180; CT-17; FL-222; FL-257; FL-52A; FL-53A; HM-103; LC-156; MB-120; MB-62; MB-63; MB-72; OPC-581; OPC-587; OPC-589; OPC-599; PS-125; SM-20; SM-30; SP-10; SP-41; UT-102;
Display typeLCD
ManualYes
Product typePortable CB radio
Product colorBlack
Housing materialSteel
Weight and Dimensions IconWeight and Dimensions
Depth239 mm
Width240 mm
Height95 mm

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