Click 'Download sample' for the free sample file:

 Download sample

Make/Model Information:

  • Brand:   Icom
  • Models included:
    • Icom IC-703

File Information:

  • Type:   Factory Service Manual (FSM)
  • Language:   English (EN)
  • Number of pages:   78
  • File size:  ∼ 10.10 MB
  • File Format:   PDF only
  • SME Watermarks:   None
  • Password lock:   No
  • Edit/copy/modify:   Yes
  • SKU:   ROIC-0033

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':

 Download sample

HF/ 50MHz ALL MODE TRANSCEIVER
SERVICE
INTRODUCTION
This service manual describes the latest service information
for the IC-703 HF/50MHz ALL MODE TRANSCEIVER.
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 liquids.
DO NOTreverse the polarities of the power supply when con-
necting the transceiver.
DO NOT apply an RF signal of more than 20 dBm (100 mW)
to the antenna connector. This could damage the transceiv-
er’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

1110004080 S.IC΅PC2709T IC-703 MAIN UNIT 5 pieces
8810009610 Screw FH M2.6Χ6 ZKIC-703 Top cover 10 pieces
Addresses are provided on the inside back cover for your
convenience.
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 NOTforce any of the variable components. Turn
them slowly and smoothly.
4.DO NOTshort any circuits or electronic parts. An insu-
lated tuning tool MUSTbe used for all adjustments.
5.DO NOTkeep power ON for a long time when the trans-
ceiver is defective.
6.DO NOT transmit power into a signal generator or a
sweep generator.
7.ALWAYSconnect a 50 dB to 60 dB attenuator between
the transceiver and a deviation meter or spectrum ana-
lyzer when using such test equipment.
8.READthe instructions of test equipment thoroughly
before connecting equipment to the transceiver.
To upgrade quality, any electrical or mechanical parts and
internal circuits are subject to change without notice or
obligation.
UT-106 equipped UT-106 option
EUR Europe
France
U.S.A.
VERSION MODEL
TABLE OF CONTENTS
SECTION 1 SPECIFICATIONS
SECTION 2 INSIDE VIEWS
SECTION 3 CIRCUIT DESCRIPTION
3 - 1 RECEIVER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 - 1
3 - 2 TRANSMITTER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 - 4
3 - 3 PLL CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 - 7
3 - 4 ANTENNA TUNER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 - 7
3 - 5 POWER SUPPLY CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 - 9
3 - 6 CPU PORT ALLOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 - 9
SECTION 4 ADJUSTMENT PROCEDURES
4 - 1 PREPARATION BEFORE SERVICING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 - 1
4 - 2 PLL ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 - 2
4 - 3 TRANSMITTER ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 - 4
4 - 4 RECEIVER ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 - 8
4 - 5 SET MODE ADJUSTMENTS (No.1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 - 10
4 - 6 PA UNIT ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 - 12
4 - 7 SET MODE ADJUSTMENTS (No.2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 - 14
SECTION 5 PARTS LIST
SECTION 6 MECHANICAL PARTS
SECTION 7 SEMI-CONDUCTOR INFORMATION
SECTION 8 BOARD LAYOUTS
8 - 1 DISPLAY BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 - 1
8 - 2 JACK BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 - 1
8 - 3 VR BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 - 2
8 - 4 MAIN UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 - 3
8 - 5 PA UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 - 5
SECTION 9 BLOCK DIAGRAM
SECTION 10 WIRING DIAGRAM
SECTION 11 VOLTAGE DIAGRAMS
11 - 1 FRONT UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 - 1
11 - 2 MAIN UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 - 2
11 - 3 PA UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 - 7
SECTION 1 SPECIFICATIONS
GENERAL
• Frequency coverage :
Receive 0.030 – 60.000 MHz*
Transmit 1.800 – 1.999 MHz*
3.500 – 3.999 MHz*
7.000 – 7.300 MHz*
10.100 – 10.150 MHz
14.000 – 14.350 MHz
18.068 – 18.168 MHz
21.000 – 21.450 MHz
24.890 – 24.990 MHz
28.000 – 29.700 MHz
50.000 – 54.000 MHz*
*Depending on version.
• Mode : USB, LSB, CW, RTTY (FSK), AM, FM
• Number of memory ch. : 105 (99 regular, 6 scan edges)
• Antenna connector : SO-239/50 ?(at antenna tuner off)
• Power supply requirement : 13.8 V DC ±15% (negative ground)
• Frequency stability : • Temp. fluctuations 0°C to +50°C
(+32°F to +122°F)
Less than ± 0.5 ppm.
• Temp. fluctuations –10°C to +60°C
(+14°F to +140°F)
Less than ± 2.5 ppm.
• Frequency resolution : General 10 kHz shift
Automatic 50 kHz shifit
Fine Less than 2 Hz shift
• Current consumption :
Transmit 10 W : 3.0 A (at 13.8 V DC)
5 W : 2.0 A (at 9.6 V DC)
Receive Standby : 300 mA (at 9.6 V DC)
AF output : 450 mA (at 9.6 V DC)*
AF output : 1.2 A (at 13.8 V DC)*
1with 10 % distortion
• Usable temperature range : –10°C to +60°C (+14°F to +140°F)
• Dimensions : 167(W) ? 58(H) ? 200(D) mm
(projections not included) 69/16(W) ? 29/32(H) ? 77/8(D) inch
• Weight : 2.0 kg (4 lb 7 oz)
• CI-V connector : 2-conductor 3.5 (d) mm ( 1/8")/8 ?
• ACC connector : 13-pin
TRANSMITTER
• Output power :
1.8–50 MHz band SSB/CW/RTTY/FM 0.1–10 W*
0.1–5 W*
AM 0.1–4 W*
0.1–2 W*
1at 13.8 V DC power supply, *
2at 9.6 V DC power supply
• Modulation system :
SSB Balanced modulation
AM Low level modulation
FM Variable reactance modulation
• Spurious emissions :
Below 30 MHz Less than –50 dB
Above 30 MHz Less than –60 dB
• Carrier suppression : More than 40 dB
• Unwanted sideband supp. : More than 50 dB
• Microphone connector : 8-pin modular jack (600 ?)
• KEY connector : 3-conductor 6.35 (d) mm ( 1/4")
• RTTY connector : 3-conductor 3.5 (d) mm ( 1/8")
RECEIVER
• Receive system : Double superheterodyne
• Intermediate frequencies : 1st IF; 64.455 kHz, 2nd IF; 455 kHz
• Receive sensitivity : (Pre-amp. is ON.)
Note: SSB, CW and AM modes are measured at 10 dB S/N.
FM mode are measured at 12 dB SINAD.
1Except 4–4.5 MHz, 8–9 MHz. *
2Pre-amp. is OFF.
• Squelch Sensitivity : (Pre-amp. is ON.)
AM, SSB, CW, RTTY Less than 5.6 ΅V
FM Less than 0.32 ΅V
• Selectivity* (Typical) :
SSB, CW, RTTY More than 2.4 kHz/–6 dB
Less than 4.0 kHz/–60 dB
AM, FM-N More than 9.0 kHz/–6 dB
Less than 20 kHz/–50 dB
FM More than 15 kHz/–6 dB
Less than 30 kHz/–50 dB
*Without an optional filter unit and with mid bandwidth selected.
• Spurious and image rejection ratio:
HF band More than 70 dB
50 MHz band More than 65 dB (except IF through)
• Audio output power : More than 1.0 W at 10% distortion
with an 8 ? load, 13.8 V DC
More than 5.0 W at 10% distortion
with an 8 ? load, 9.6 V DC
• RIT variable range : ± 9.99 kHz
• PHONES connector : 3-conductor 3.5 (d) mm ( 1/8")/8 ?
• EXT SP connector : 2-conductor 3.5 (d) mm ( 1/8")/8 ?
0.25 ΅V
FREQUENCY
0.5 – 1.8 MHz
1.8 – 28 MHz*
28 – 29.999 MHz
50 MHz band
SSB/CW/RTTY
0.16 ΅V
0.16 ΅V
0.13 ΅V
All stated specifications are subject to change without notice or obligation.
SECTION 8 BOARD LAYOUTS
8-1 DISPLAY BOARD • TOP VIEW
P.AMP/ATT
TUNER/CALL
RIT/SUB
PHONES
DISPLAY
LRXD 17
to MAIN
unit J5101
8-2 JACK BOARD • TOP VIEW
1-1-32, Kamiminami, Hirano-ku, Osaka 547-0003, Japan S-13912HZ-C1
C 2003 Icom Inc.


Payment

Before sending payment please download the sample file to verify the following:

  •   Check the Brand, Model and Year.
  •   Review the Table of Contents (TOC).
  •   Review the Bookmarks.
  •   Inspect the quality of images.

7.00USD

Paypal
Credit card*
Debit card**

*Credit card or Debit card processing at Paypal portal.
**Debit card: available only from selected countries/territories.