Icom IC-A14 User manual

S-14417XZ-C1
Jan. 2008
VHF AIR BAND TRANSCEIVER

This service manual describes the latest service
information for the IC-A14 and IC-A14S VHF AIR BAND
TRANSCEIVER at the time of publication.
NEVER connect the transceiver to an AC outlet or to a DC
power supply that uses more than specifed. 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 transceiver’s
front-end.
To upgrade quality, any electrical or mechanical parts and
internal circuits are subject to change without notice or
obligation.
MODEL VERSION KEY TYPE
IC-A14
[USA]
Full key
[USA-01]
[EXP]
[EXP-01]
IC-A14S
[USA]
Simple key
[USA-01]
[EXP]
[EXP-01]
Be sure to include the following four points when ordering
replacement parts:
1. 10-digit Icom parts numbers
2. Component name
3. Equipment model name and unit name
4. Quantity required
<ORDER EXAMPLE>
1110003491 S.IC TA31136FNG IC-A14 MAIN UNIT 5 pieces
8820001210 Screw 2438 screw IC-A14 Top cover 10 pieces
Addresses are provided on the inside back cover for your
convenience.
Icom, Icom Inc. and (Japan) in the United States, the United
Kingdom, Germany, F
ORDERING PARTS
1. Make sure the 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 Standard Signa
Generator or a Sweep Generator.
7. ALWAYS connect a 50 dB to 60 dB attenuator between
the transceiver and a Deviation Meter or Spectrum
Analyzer when using such test equipment.
8. READ the instructions of test equipment throughly
before connecting a test equipment to the transceiver.
REPAIR NOTES
INTRODUCTION
CAUTION
UNIT ABBREVIATIONS:
C=CHASSIS PARTS
M=MAIN UNIT
P=PA UNIT
DC=DC UNIT
A=ANT UNIT

CONTENTS
SECTION 1 SPECIFICATIONS
SECTION 2 INSIDE VIEWS
SECTION 3 DISASSEMBLY INSTRUCTION
SECTION 4 CIRCUIT DESCRIPITON
4-1 RECEIVER CIRCUITS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4-2 TRANSMITTER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
4-3 FREQUENCY SYNTHESIZER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
4-4 PORT ALLOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
4-5 VOLTAGE BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
SECTION 5 PARTS LIST
SECTION 6 MECHANICAL PARTS
SECTION 7 BOARD LAYOUTS
SECTION 8 BLOCK DIAGRAM
SECTION 9 VOLTAGE DIAGRAM
MAIN UNIT (Left side) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1
MAIN UNIT (Center) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-2
MAIN UNIT (Right side). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3
DC, PA AND ANT UNITS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-4

SECTION 1 SPECIFICATIONS
PGeneral
• Frequency coverage :
IC-A14 TX 118.000 to 136.975 MHz
RX 108.000 to 136.975 MHz
WX (Rx only) 161.650 to 163.275 MHz
IC-A14S TX/RX 118.000 to 136.975 MHz
• Mode : 6K00A3E
16K0G3E (IC-A14/Rx only)
• Channel spacing : 25 kHz
•
Number of memory channels:
IC-A14 200 (20 CH ×10 BANKS)
IC-A14S 100
• Power supply requirement : Specified Icom’s battery packs
7.4 V DC standard
• Usable temperature range : –10˚C to +60˚C (+14°F to +140°F)
• Current drain (at 7.4 V DC):
Tx 1.5 A
Rx at stand by 50 mA typical
at AF max. 500 mA
• Antenna connector : BNC 50 Ω(nominal)
• Dimensions : 53(W) ×120(H) ×36.9(D) mm
(projections not included) 23⁄32(W) ×423⁄32(H) ×19⁄16(D) inch
• Weight : Approx. 180 g (6.35 oz) (Without the battery pack and antenna.)
PTransmitter
• Output power : 5.0 W (PEP) typical
1.5 W (CW)
• Modulation : Low level modulation
• Modulation limiting : 70 to 100%
• Frequency stability : ±5 ppm
• Audio harmonic distortion : Less than 10% (at 60% mod.)
• Hum and noise ratio : More than 35 dB
• Spurious emissions : More than 46 dB (except operating frequency ±62.5 kHz range)
• External MIC connector : 3-conductor 2.5(d) mm (1⁄10˝)/150 Ω
PReceiver
• Receive system : Double conversion superheterodyne
• Intermediate frequencies : 1st 46.35 MHz, 2nd 450 kHz
• Sensitivity :
COM band (6 dB S/N) –6 dBµ typical
NAVI band (6 dB S/N) –3 dBµ typical (IC-A14 only)
WX channels (12 dB SINAD) –13 dBµ typical (IC-A14 only)
• Squelch sensitivity : AM Less than 0 dBµ
(threshold) FM Less than –5 dBµ
(IC-A14 only)
• Selectivity : 6 dB (More than 7.5 kHz)
60 dB (Less than 25 kHz)
•
Spurious response rejection : AM More than 60 dB
FM More than 30 dB
(IC-A14 only)
• Audio output power : More than 700 mW (internal SP)
(at 10% distortion with an 8 ΩMore than 500 mW (external SP)
load, 30% mod.)
• Hum and noise : More than 35 dB at 30% mod.
• External SP connector : 3-conductor 3.5 (d) mm (1⁄8˝)/8 Ω
All stated specifications are subject to change without notice or obligation.

3 - 1
SECTION 3 DISASSEMBLY INSTRUCTION
1. Removing the front panel
qRemove the VR knob and antenna nut.
wUnscrew 2 screws from the bottom.
eUnscrew 2 screws from the side, and remove the jack
panel.
rTake off the CHASSIS assembly in direction of the arrow
until the speaker cable appears.
tDisconnect the speaker connector from the CHASSIS
assembly, and separate the front panel and CHASSIS
assembly completely.
wUnsolder total of 8 points from the shield cover then
remove it.
eUnscrew 2 screws from the side plate then remove it.
rUnscrew total of 4 screws from the MAIN UNIT.
tUnsolder total of 12 points which connecting PA UNIT
then remove the MAIN UNIT from the CHASSIS.
2. Removing the MAIN UNIT
q Remove the seal, VR nut and VR plate from the CHASSIS
assembly.
Chassis
assembly
2 screws
Speaker
connector
Speaker
cable
Jack
p
anel
Antenna nut
VR knob
Front panel
Seal
VR nut
VR plate
Chassis
assembly
Shied cover
MAIN UNIT
PA UNIT
12 points
2 screws
2 screws
2 screws
4 points
4 points
Side plate
Chassis
PA UNIT
2 points
2 points
3 screws
3. Removing the PA UNIT
qUnscrew 3 screws from the PA UNIT.
wUnsolder total of 4 points then remove the PA UNIT from
the CHASSIS.
(Continued to right above)

1-1-32, Kamiminami, Hirano-ku, Osaka 547-0003, Japan S-14417XZ-C1
© 2008 Icom Inc.

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