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Make/Model Information:

  • Brand:   Icom
  • Models included:
    • Icom IC-2720H

File Information:

  • Type:   Factory Service Manual (FSM)
  • Language:   English (EN)
  • Number of pages:   148
  • File size:  ∼ 6.80 MB
  • File Format:   PDF only
  • SME Watermarks:   None
  • Password lock:   No
  • Edit/copy/modify:   Yes
  • SKU:   ROIC-0019

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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DUAL BAND FM TRANSCEIVER
i2720H
SERVICE
INTRODUCTION
This service manual describes the latest service information
for the IC-2720H DUAL BAND FM TRANSCEIVER at the
time of publication
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 NOT reverse the polarities of the power supply when
connecting 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

1110004310 S.IC M62352GP IC-2720H MAIN UNIT 5 pieces
8810009610 Screw FH M2.6
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 NOT force any of the variable components. Turn
them slowly and smoothly.
4. DO NOT short any circuits or electronic parts. An insu-
lated tuning tool MUST be used for all adjustments.
5. DO NOT keep 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. ALWAYS connect a 50 dB to 60 dB attenuator between
the transceiver and a deviation meter or spectrum ana-
lyzer 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-2720H
VERSION
U.S.A.
Korea
S.E.Asia
Export
SYMBOL
KOR
TABLE OF CONTENTS
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 - 5
4 - 3 PLL CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 - 6
4 - 4 POWER SUPPLY CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 - 8
4 - 5 CPU PORT ALLOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 - 10
SECTION 5 PARTS LIST
SECTION 6 MECHANICAL PARTS AND DISASSEMBLY
SECTION 7 SEMI-CONDUCTOR INFORMATION
SECTION 8 BOARD LAYOUTS
8 - 1 CONTROL UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 - 1
8 - 2 MAIN UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 - 3
8 - 3 VCO UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 - 5
SECTION 9 BLOCK DIAGRAM
SECTION 10 VOLTAGE DIAGRAMS
10 - 1 CONTROL UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 - 1
10 - 2 MAIN AND VCO UNITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 - 2
SECTION 1 SPECIFICATIONS
All stated specifications are subject to change without notice or obligation.
M GENERAL
Frequency range :
LEFT SIDE
RIGHT SIDE
*1Guaranteed 144.000 146.000 MHz only, * 2Guaranteed 144.000 148.000 MHz only,
*3Guaranteed 430.000 440.000 MHz only; * 4Guaranteed 440.000 450.000 MHz only
*5Not guaranteed range
Mode : FM, AM (AM range is 118.0 135.995 MHz and Rx only for [USA] and [EXP].)
Nomber of memory channel : 212 (including 2 call channels and 10 scan edges)
Usable temperature range : 10C to +60C; +14F to +140F
Frequency resolution : 5, 10, 12.5, 15, 20, 25, 30 and 50 kHz
Frequency stability : 10 ppm (10C to +60C; +14F to +140F)
Power supply requirement : 13.8 V DC 15 % (negative ground)
Current drain (at 13.8 V DC) : Receive Standby (squelched) 1.2 A
Max. audio output 1.8 A
Transmit at VHF 50 W/UHF 35 W 12.0 A/11.0 A
Antenna connector : SO-239 (50 )
DATA connector : Mini DIN 6 pin
Dimensions : Controller 140(W)
(projections not included) Main unit 140(W)
Weight : Controller 150 g; 5.29 oz
Main unit 1.4 kg; 3.0 lb
M TRANSMITTER
Output power : VHF 50 W/25 W/5 W (selectable)
UHF 35 W/25 W/5 W (selectable)
Modulation system : Variable reactance frequency
Maximum frequency deviation : 5.0 kHz
Spurious emissions : Less than 60 dB
Microphone connector : 8-pin modular jack (600 )
M RECEIVER
Receive system : Double-conversion superheterodyne
Intermediate frequency : 1st IF 38.85 MHz/46.05 MHz
(Left/right side band) 2nd IF 450 kHz/455 kHz
Sensitivity : Less than 0.18 V (at 12 dB SINAD)
Squelch sensitivity : Less than 0.13 V (at threshold)
Selectivity : More than 12 kHz/6 dB (Wide); More than 6 kHz/6 dB (Narrow)
Less than 30 kHz/60 dB (Wide); Less than 20 kHz/60 dB (Narrow)
Spurious and image rejection : More than 60 dB
Audio output power (at 13.8 V) : More than 2.4 W at 10% distortion with an 8 load
External speaker connector : 2-conductor 3.5(d) mm ( 1/8")/8
VERSION
RX (MHz)
144.000146.000, 430.000440.000
136.000179.995*
2, 430.000440.000
118.000549.995*
118.000549.995*
TX (MHz)
144.000146.000, 430.000440.000
140.000150.000*
2, 430.000440.000
136.000174.000*
2, 400.000479.000*
144.000148.000, 430.000450.000*
VERSION
RX (MHz)
144.000146.000, 430.000440.000
136.000173.995*
2, 430.000440.000
118.000179.995*
2, 375.000549.995*
810.000999.990*
118.000174.000*
2, 375.000549.995*
810.000824.000*
5, 849.000869.000*
894.000999.990*
TX (MHz)
144.000146.000, 430.000440.000
140.000150.000*
2, 430.000440.000
136.000174.000*
2, 400.000479.000*
144.000148.000, 430.000450.000*
SECTION 3 DISASSEMBLY INSTRUCTIONS
Removing the MAIN unit
Unscrew 8 screws A, and remove the cover.
` Disconnect two cables B from J1 and J2007.
Remove the clip c.
MAIN UNIT
Unsolder 3 points E.
Unscrew 4 screws F.
Unsolder 4 points G, and remove the cover H.
? Unscrew 2 screws I.
? Unscrew 12 screws J, and remove MAIN unit.
SECTION 8 BOARD LAYOUTS
8-1 CONTROL UNIT TOP VIEW
BAND V/MHz
BAND V/MHz
to MAIN unit J2006
to Microphone
EXTMIC
1-1-32, Kamiminami, Hirano-ku, Osaka 547-0003, Japan S-13907HZ-C1
2002 Icom Inc.
INSTRUCTION MANUAL
i2720H DUAL BAND FM TRANSCEIVER
This device complies with Part 15 of the FCC rules. Operation is sub-
ject to the following two conditions: (1) This device may not cause
harmful interference, and (2) this device must accept any interference
received, including interference that may cause undesired operation.


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