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Make/Model Information:

  • Brand:   Icom
  • Models included:
    • Icom IC-208H

File Information:

  • Type:   Factory Service Manual (FSM)
  • Language:   English (EN)
  • Number of pages:   52
  • File size:  ∼ 3.60 MB
  • File Format:   PDF only
  • SME Watermarks:   None
  • Password lock:   No
  • Edit/copy/modify:   Yes
  • SKU:   ROIC-0002

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VHF/UHF FM
TRANSCEIVER
INTRODUCTION
This service manual describes the latest service information
for the IC-208H VHF/UHF FM TRANSCEIVER at the time 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 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

1140005990 S.IC MB15A02PFV-1 IC-208H MAIN UNIT 5 pieces
8810009610 Screw FH M2.6×6 ZKIC-208H Bottom 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 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-208H
VERSION
Taiwan
U.S.A.
Australia
Export
SYMBOL
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 - 4
4 - 3 PLL CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 - 6
4 - 4 OTHER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 - 8
4 - 5 POWER SUPPLY CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 - 8
4 - 6 PORT ALLOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 - 9
SECTION 5 ADJUSTMENT PROCEDURES
5 - 1 PREPARATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 - 1
5 - 2 SOFTWARE ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 - 3
SECTION 6 PARTS LIST
SECTION 7 MECHANICAL PARTS AND DISASSEMBLY
SECTION 8 SEMI-CONDUCTOR INFORMATION
SECTION 9 BOARD LAYOUTS
9 - 1 CONTROL UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 - 1
9 - 2 MAIN UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 - 3
9 - 3 VCO BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 - 5
SECTION 10 BLOCK DIAGRAM
SECTION 11 VOLTAGE DIAGRAMS
11 - 1 CONTROL UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 - 1
11 - 2 MAIN UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 - 2
SECTION 1 SPECIFICATIONS
All stated specifications are subject to change without notice or obligation.
M GENERAL
• Frequency range :
*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
*5Guaranteed 430.000 – 434.000 MHz, 435.000 – 438.000 MHz only; * 6Not guaranteed range
• Mode : FM, AM (AM range is 118.0 – 135.995 MHz and Rx only for [USA] and [EXP].)
• Number of memory channel : 502 (including 2 call channels)
• Usable temperature range : –10°C to +60°C; +14°F to +140°F
• Frequency resolution : 5, 10, 12.5, 15, 20, 25, 30, 50, 100 and 200 kHz
• Scan mode : Full, Program, Priority, Memory channel, Bank, Skip and Tone
• Frequency stability : ±10 ppm (–10°C to +60°C; +14°F to +140°F)
• Power supply requirement : 13.8 V DC ±15 % (negative ground)
• Current drain (at 13.8 V DC) :
1VHF only (except [KOR]), *
2[TPE] only
• Antenna connector : SO-239 (50 ?)
• DATA connector : Mini DIN 6 pin
• Dimensions : 141(W)×40(H)×185.4(D) mm; 59/16(W)×19/16(H)×79/32(D) inch (projections not included)
• Weight : 1.2 kg; 2 lb 10 oz
M TRANSMITTER
• Output power : VHF 55 W (50 W: [KOR], 25W: [TPE])/15 W/5 W (selectable)
UHF 50 W/15 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 46.05 MHz
2nd IF 450 kHz
• Sensitivity : Less than 0.18 µV (at 12 dB SINAD)
• Squelch sensitivity : Less than 0.13 µV (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 2.0 W at 10% distortion with an 8 ? load
• External speaker connector : 2-conductor 3.5(d) mm ( 1/8")/8 ?
VERSION
RX (MHz)
144.000–146.000, 430.000–440.000
118.000–173.995*
2, 230.000–549.995*
810.000–824.000*
5, 849.000–869.000*
894.000–999.990*
118 –173.995*
2, 230.000–549.995*
810.000–999.990*
144.000–146.000, 430.000–432.000
118 –173.995*
2, 230.000–549.995*
810.000–999.990*
TX (MHz)
144.000–146.000*
2, 430.000–440.000
144.000–148.000, 420.000–450.000*
144.000–148.000, 420.000–450.000*
144.000–146.000, 430.000–432.000
136.000–173.995*
2, 400.000–478.995*
VHF UHF
High: 55 W*
1/50 W/25 W*
2 12 A*
1/11.5 A/8 A*
2 11.5 A/8 A
TX Middle: 15 W (Approx.) 7.5 A
Low: 5 W (Approx) 5.5 A 5.0 A
RX Standby 0.8 A
Maximum output power 1.0 A
SECTION 2 INSIDE VIEWS
• CONTROL UNIT (TOP VIEW)
C 074)
K ht
LCD back light
(DS22: CV1074)
Key back lights
DS13-DS18, DS20: SML512MW
DS21: SML-020MYT
• MAIN UNIT (TOP VIEW)
VCO board
EEP ROM
(IC501: HN58X24128FPI)
AF amplifier
(IC510: LA4425A)
1st mixer [VHF band]
(Q32: 3SK299)
1st mixer [400M,800MHz band]
(IC12: µPC2757TB) D/A converter
(IC11: M62352GP)
Ceramic bandpass filter
FI1: CFWS450HT
FI2: CFWM450E
MAIN CPU
: HD6432143SA70FA [USA]only
: HD6432143SA69FA except[USA]
SECTION 9 BOARD LAYOUTS
9-1 CONTROL UNIT • TOP VIEW
M/CALL
T-SCAN
1-1-32, Kamiminami, Hirano-ku, Osaka 547-0003, Japan S-14001HZ-C1
C 2003 Icom Inc.


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