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Make/Model Information:

  • Brand:   Icom
  • Models included:
    • Icom IC-F2721
    • Icom IC-F2721D
    • Icom IC-F2710
    • Icom IC-F2821
    • Icom IC-F2821D
    • Icom IC-F2810

File Information:

  • Type:   Factory Service Manual (FSM)
  • Language:   English (EN)
  • Number of pages:   49
  • File size:  ∼ 7.60 MB MB
  • File Format:   PDF only
  • SME Watermarks:   None
  • Password lock:   No
  • Edit/copy/modify:   Yes
  • SKU:   ROIC-0068

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
UHF MOBLE TRANSCEIVERS
INTRODUCTION DANGER
This service manual describes the latest service information
for the IC-F2721/D/F2710/F2821/D/F2810 UHF MOBILE
TRANSCEIVER at the time of publication.
6 versions of the IC-F2721 have been designed. This
service manual covers each version.
IC-F2700 Series
IC-F2800 Series
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

1130011600 S.IC TA31136FN IC-F2721D MAIN UNIT 5 pieces
8820001210 Screw 2438 screw IC-F2721 Chassis 12 pieces
Addresses are provided on the inside back cover for your
convenience.
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 NOT reverse the polarities of the power supply when
connecting the transceiver.
DO NOT apply an RF signal of more than 20 dBm (100mW)
to the antenna connector. This could damage the trans-
ceiver's front end.
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 turning 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 40 dB to 50 dB attenuator between
the transceiver and a deviation meter or spectrum
analyzer when using such test equipment.
8. READ the 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.
IC-F2721D
IC-F2721
IC-F2710
IC-F2821D
IC-F2821
IC-F2810
VERSION
USA-02, USA-03, USA-04, USA-05
USA-06, USA-07
EUR-02, EUR-03, GEN-02, GEN-03
USA-02, USA-03, USA-04, USA-05
USA-06, USA-07
EUR-02, EUR-03, GEN-02, GEN-03
10 KEY
TX power
SECTION 1 SPECIFICATIONS
SECTION 2 INSIDE VIEWS
SECTION 3 DISASSEMBLY INSTRUCTIONS
SECTION 4 CIRCUIT DESCRIPTION
4-1 RECEIVER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4-2 TRANSMITTER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
4-3 PLL CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
4-4 POWER SUPPLY CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
4-5 OTHER CIRCUITS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
4-6 PORT ALLOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
SECTION 5 ADJUSTMENT PROCEDURES
5-1 PREPARATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
5-2 LCD CONTRAST ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
5-3 SOFT WARE ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5
SECTION 6 PARTS LIST
SECTION 7 MECHANICAL PARTS AND DISASSEMBLY
SECTION 8 SEMI-CONDUCTOR INFORMATION
SECTION 9 BOARD LAYOUTS
9-1 FRONT-A UNIT (for IC-F2700 Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1
9-2 FRONT-B UNIT (for IC-F2800 Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3
9-3 MAIN UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-5
SECTION 10 BLOCK DIAGRAM
SECTION 11 VOLTAGE DIAGRAM
11-1 FRONT-A UNIT (for IC-F2700 Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-1
11-2 FRONT-B UNIT (for IC-F2800 Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-2
11-3 MAIN UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-3
TABLE OF CONTENTS
Icom, Icom Inc. and logo are registered trademarks of Icom Incorporated (Japan) in the United States, the United
Kingdom, Germany, France, Spain, Russia and/or other countries.
SECTION 1 SPECIFICATIONS
IC-F2721/D, IC-F2821/D IC-F2710, IC-F2810
USA GEN EUR
GENERAL
Measurement method EIA-152-C/204D or TIA-603 EN 300 086
Frequency coverage [L] : 400.000470.000 MHz
[H] : 450.000512.000 MHz
[L] : 400.000470.000 MHz
[H] : 480.000520.000 MHz
Type of emission
8K10F1E/8K10F1D*/
11K0F3E/16K0F3E
*IC-F2721D, IC-F2821D only
8K50F3E/16K0F3E 8K50F3E/14K0F3E/
16K0F3E
Number of conventional channels Max. 256 channels
Power supply voltage
(negative ground) 13.6 V DC nominal 13.2 V DC nominal
Current drain (approx.)
TX 14.0 A (at 45 W) 7.0 A (at 25 W)
RX Stand-by : 600 mA
Max. audio : 1200 mA
Frequency error 2.0 ppm 1.5 kHz
Operating temperature range 30C to +60C (22F to +140F) 25C to +55C
Dimensions (proj. not included) 175(W) 45(H) 170(D) mm; 67/8(W) 125/32(H) 611/16(D) in
Weight (approx.) 1.5 kg; 35/16 lb
TRANSMITTER
RF output power (Hi/L2/L1) 45 W/25 W/4.5 W 25 W/10 W/2.5 W
Modulation system Variable reactance frequency modulation
Maximum permissible deviation 2.5 kHz [Narrow], 4.0 kHz [Middle], 5.0 kHz [Wide]
Spurious emissions 75 dB typical 0.25 W (= 1 GHz)
1.0 W (> 1 GHz)
Adjacent channel power 60 dB min. [Narrow], 70 dB min. [Middle]/[Wide]
Audio frequency response +2 dB to -5 dB of 6 dB/octave range
from 300 Hz to 2550 Hz [Narrow]/3000Hz [Middle]/[Wide]
Audio harmonic distortion 3% typical at 1 kHz, 40% deviation
Limiting charact of modulator 70100% of max. deviation
Microphone connector 8-pin modular (600 ?)
RECEIVER
Receive system Double conversion superheterodyne system
Intermediate frequencies 1st: 46.35 MHz, 2nd: 450 kHz
Sensitivity (typical) 0.3 V at 12 dB SINAD 4 dBV (emf) at 20 dB SINAD
Squelch sensitivity (typical) 0.3 V 4 dBV (emf)
Adjacent channel selectivity 60 dB min. (75 dB typical) [Narrow], 70 dB min. (80 dB typical) [Middle]/[Wide]
Spurious response 70 dB min. (80 dB typical)
Intermodulation 70 dB min. (75 dB typical) [Narrow]
70 dB min. (77 dB typical) [Wide] 65 dB min. (70 dB typical)
Audio output power 4 W typical at 10% distortion with a 4 ? load
22 W typical (BTL) at 10% distortion with a 4 ? load (D-SUB 25 connector)
External SP connector 2-conductor 3.5 (d) mm (1/8")/4 ?
All stated speci? cations are subject to change without notice or obligation.
SECTION 9 BOARD LAYOUTS
H5 H10 H15 H20 H25 H30 H35 H40 H45 H50 H55 H60 H65 H70 H75 H80 H85 H90 H95 H100 H105 H110 H115 H0
to MIC JACK
AF VOLUME DIAL
9-1 FRONT-A UNIT (for IC-F2700 Series)
TOP VIEW
The combination of this page and the next page shows
the unit layout in the same configuration as the actual
P.C. Board.
1-1-32, Kamiminami, Hirano-ku, Osaka 547-0003, Japan S-14127MZ-C1
2005 Icom Inc.


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