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Make/Model Information:

  • Brand:   Icom
  • Models included:
    • Icom IC-718

File Information:

  • Type:   Factory Service Manual (FSM)
  • Language:   English (EN)
  • Number of pages:   143
  • File size:  ∼ 13.10 MB
  • File Format:   PDF only
  • SME Watermarks:   None
  • Password lock:   No
  • Edit/copy/modify:   Yes
  • SKU:   ROIC-0034

NOTE:  This list was created by program script and may not accurately represent the text from the source pages.   For full preview please click on 'Download sample':

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SERVICE MANUAL
ADDENDUM
CONTENTS
REPLACEMENT PAGES . . . . . . . . . . . . . . . . . . . . . . 54 and 55
PARTS LIST. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
VOLTAGE DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . 15
Mar. 2010
SERVICE MANUAL
ADDENDUM
CONTENTS
PARTS LIST. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
BOARD LAYOUTS . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
VOLTAGE DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . 18
Jul. 2009
Oct. 2008
SERVICE MANUAL
ADDENDUM
CONTENTS
PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
BOARD LAYOUTS (MAIN, PLL, PA and FILTER UNITS). . . . 12
VOLTAGE DIAGRAM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Oct. 2008
SERVICE MANUAL
ADDENDUM
CONTENTS
TRANSMITTER ADJUSTMENTS for PA UNIT "B-5380I". . . . 1
PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
BOARD LAYOUTS (MAIN, PLL, PA and FILTER UNITS). . . . 13
BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
VOLTAGE DIAGRAM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Oct. 2007

HF TRANCEIVER iC-718
REPAIR NOTES
1. Make sure a problem is internal before disassembling the
transceiver.
2. DO NOT open the transceiver until the transceiver is
disconnected from its power source.
3. DO NOT force any of the variable components. Turn
them slowly and smoothly.
4. DO NOT short any circuits or electronic parts. An
insulated tuning tool MUST be used for all adjustments.
5. DO NOT keep power ON for a long time when the
transceiver is defective.
6. DO NOT transmit power into a signal generator or a
sweep generator.
7. ALWAYS connect a 50 dB or 60 dB attenuator between
the transceiver and a deviation meter or spectrum analyser
using such test equipment.
8. READ the instructions of test equipment thoroughly
before connecting equipment to the transceiver.
To upgrade quality, all electrical or mechanical parts
and internal circuits are subject to change without
notice or obligation.
DANGER
NEVER
connect the transceiver to an AC outlet or to a DC
power supply that uses more than 16 V. This will ruin the
transceiver.
DO NOT
expose the transceiver to rain, snow or any liq-
DO NOT
reverse the polarrities of the power supply when
connecting the tranceiver.
DO NOT
apply an RF signal of more than 20 dBm (100
mW) to the antenna connector. This could damage the
transceiver’s front end.
ORDERING PARTS
Be sure to include the following four points when ordering
replacement parts:
1. 10-digit order numbers
2. Component part number and name
3. Equipment model name and unit name
4. Quantity required

1110001810 S.IC TA7368F IC-718 MAIN UNIT 1 piece
8810009650 Screw FH BT M3
Addresses are provided on the inside back cover for your
convenience.
INTRODUCTION
This service manual describes the latest service information
for the IC-718 HF TRANCEIVER at the time of publication.
IC-718
VERSION
U.S.A.
Europe
France
U.S.A.
SYMBOL



















TABLE OF CONTENTS
SECTION 1 SPECIFICATIONS
SECTION 2 INSIDE VIEWS
SECTION 3 DISASSEMBLY INSTRUCTIONS
SECTION 4 CIRCUIT DESCRIPTION
4 1 RECEIVER CIRCUITS
4 2 TRANSMITTER CIRCUITS
4 3 PLL CIRCUIT
4 4 LOGIC CIRCUITS
4 5 REGULATOR CIRCUITS
SECTION 5 ADJUSTMENT PROCEDURES
5 1 PREPARATION BEFORE SEVICING
5 2 PLL ADJUSTMENTS
5 3 TRANSMITTER ADJUSTMENTS
5 4 RECEIVER ADJUSTMENTS
5 5 SET MODE ADJUSTMENT
SECTION 6 PARTS LIST
SECTION 7 MECHANICAL PARTS AND DISASSEMBLY
SECTION 8 SEMI-CONDUCTOR INFORMATIONS
SECTION 9 BOARD LAYOUTS
9 1 MAIN UNIT
9 2 PLL UNIT
9 3 LOGIC UNIT
9 4 PHONE BOARD
9 5 MIC BOARD
9 6 VR BOARD
9 7 FILTER UNIT
9 8 PA UNIT
SECTION 10 BLOCK DIAGRAM
SECTION 11 WIRING DIAGRAM
SECTION 12 VOLTAGE DIAGRAMS
SECTION 1 SPECIFICATIONS
GENERAL
Frequency coverage :
Receive 0.03029.999999 MHz*1
Transmit 1.8001.999 MHz*2 3.5003.999 MHz*2
7.0007.300 MHz 10.10010.150 MHz
14.00014.350 MHz 18.06818.168 MHz
21.00021.450 MHz 24.89024.990 MHz
28.00029.700 MHz
*1 Guaranteed range: 0.529.999999 MHz.
*2 Varies accoding to version.
Mode : USB, LSB, CW, AM, RTTY (FSK)
No. of memory Ch. : 101 (99 regular, 2 scan edges)
Freq. resolution : 1 Hz
Frequency stability : Less than 200 Hz from 1 min. to
60 min. after power ON. After that
rate of stability less than 30 Hz/hr
at +25C (+77F). Temperature
fluctuations 0C to 50C (+32F to
+122F) less than 350 Hz.
Power supply requirement : 13.8 V DC 15 %
(negative ground)
Current consumption :
Transmit max. power 20.0 A
Receive stand-by 1.3 A
max. audio 2.0 A
Usable temp. range : 10C to +60C (14F to 140F)
Antenna connector : SO-239 (50 ?)
Dimensions : 240 (W) ? 95(H) ? 239(D) mm
(projection not included) 97/16(W) ? 33/4(H) ? 913/32(D) in
Weight : 3.8 kg (8 lb 6 oz)
ACC connector : 13-pin
REMOTE connector : 2-conductor 3.5(d) mm ( 1/8")
TRANSMITTER
Modulation system :
SSB Balanced modulation
AM Low level modulation
Output power :
SSB/CW/RTTY/FM 2100 W
AM 240 W
Spurious emission : Less than 50 dB below peak out-
put power
* spurious frequency ; below 30 MHz: 50 dB,
above 30 MHz: 60 dB
Carrier suppression : More than 40 dB
Unwanted sideband suppression:
More than 50 dB
Mic. connector : 8-pin connector (600 ?)
KEY connector : 3-conductor 6.5(d) mm ( 1/4")
SEND connector : Phono (RCA)
ALC connector : Phono (RCA)
RECEIVER
Receive system : Double-conversion
superheterodyne
Sensitivity (10 dB S/N) :
SSB, CW, RTTY 0.16 V* 1 (1.829.999999 MHz)
AM 13 V (0.51.799999 MHz)
2.0 V*1 (1.829.999999 MHz)
*1 Pre-amp 1 ON
Squelch sensitivity : Less than 5.6 V (SSB)
Selectivity :
SSB, CW, RTTY More than 2.1 kHz/6 dB
Less than 4.5 kHz/60 dB
AM More than 6.0 kHz/6 dB
Less than 20.0 kHz/40 dB
Spurious and image rejection ratio:
More than 70 dB
(1.829.999999 MHz)
Audio output power : More than 2.0 W
(at 13.8 V DC) at 10 % distortion with an 8 ? load
RIT variable range : 1200 Hz
PHONES connector : 3-conductor 6.5(d) mm ( 1/4")
EXT SP connector : 2-conductor 3.5(d) mm ( 1/8") 8 ?
All stated specifications are subject to change without notice or obligation.
FILTER UNIT BOTTOM VIEW
The combination of this page and the previous page
shows the unit layout in the same configuration as the
actual P.C. Board.
S-13701MZ-C1
2000 Icom Inc.
6-9-16, Kamihigashi, Hirano-ku, Osaka 547-0002, Japan
Count on us!


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