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Make/Model Information:

  • Brand:   Icom
  • Models included:
    • Icom IC-F33GT
    • Icom IC-F34GT
    • Icom IC-F33GS
    • Icom IC-F34GS

File Information:

  • Type:   Factory Service Manual (FSM)
  • Language:   English (EN)
  • Number of pages:   35
  • File size:  ∼ 1.10 MB
  • File Format:   PDF only
  • SME Watermarks:   None
  • Password lock:   No
  • Edit/copy/modify:   Yes
  • SKU:   ROIC-0075

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VHF TRANSCEIVERS
SERVICE
MANUAL
INTRODUCTION
DANGER
ORDERING PARTS
This service manual describes the latest service
information for the IC-F33GT/GS and IC-F34GT/GS VHF
TRANSCEIVERS at the time of publication.
NEVER connect the transceiver to an AC outlet or to a DC
power supply that uses more than 8 V. Such a connection
could cause a fire or electric hazard.
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 trans-
ceiver's front end.
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

5030002760 LCD FX-2721 LCD IC-F33GT Main unit 5 pieces
8810009220 Screw BO 2x8 ZK IC-F33GT/GS Chassis 10 pieces
Addresses are provided on the inside back cover for your
convenience.
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 30 dB to 40 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, all electrical or mechanical parts and
internal circuits are subject to change without notice or
obligation.
Icom, Icom Inc. and are registered trademarks of Icom Incorporated (Japan) in the United States, the United Kingdom,
Germany, France, Spain, Russia and/or other countries.
MODEL CHANNEL SPACING SYMBOL FREQUENCY
IC–F33GT 15.0/30.0 kHz USA-01 136–174 MHz
12.5/25.0 kHz GEN-01 136–174 MHz
IC–F34GT 12.5/20.0/25.0 kHz EUR-01 136–174 MHz
IC–F33GS 15.0/30.0 kHz USA-01 136–174 MHz
12.5/25.0 kHz GEN-01 136–174 MHz
IC–F34GS 12.5/20.0/25.0 kHz EUR-01 136–174 MHz
REPAIR NOTES
TABLE OF CONTENTS
SECTION 1 SPECIFICATIONS
SECTION 2 INSIDE VIEWS
SECTION 3 DISASSEMBLY INSTRUCTIONS
SECTION 4 CIRCUIT DESCRIPITON
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
SECTION 5 ADJUSTMENT PROCEDURES
5-1 PREPARATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
5-2 SOFTWARE ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
SECTION 6 PARTS LIST
SECTION 7 MECHANICAL PARTS AND DISASSEMBLY
SECTION 8 SEMICONDUCTOR INFORMATION
SECTION 9 BOARD LAYOUTS
9-1 MAIN UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1
9-2 PA UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3
9-3 ANT UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3
9-4 FUSE UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3
SECTION 10 BLOCK DIAGRAM
SECTION 11 VOLTAGE DIAGRAM
11-1 MAIN UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-1
11-2 PA/ANT/FUSE UNITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-3
¦ GENERAL
• Frequency coverage : 136.000–174.000 MHz
• Mode : FM
• Type of emission :
• Number of conventional channels : 256 ch, 16 banks
• Antenna impedance : 50 ? (nominal)
• Operating temperature range : –30°C to +60°C (–22°F to +140°F) [USA], [GEN]
–25°C to +55°C [EUR]
• Power supply requirement : 7.2 V DC nominal (negative ground)
• Current drain (at 7.2 V DC) :
• Dimensions (projections not included) : 53.0(W) Χ 120.0(H) Χ 32.5(D) mm; 23/32(W) Χ 423/32(H) Χ 19/32(D) in
• Weight (with BP-231+F A-SC55V-1) : 285 g; 101/16 oz (Approx.)
¦ TRANSMITTER
• Output power (at 7.2 V DC) : High: 5 W, Low: 1 W
• Modulation : Variable reactance frequency modulation
• Maximum permissible deviation : ±5.0 kHz (Wide), ±4.0 kHz (Middle), ±2.5 kHz (Narrow)
• Frequency error : ±2.5 ppm
• Spurious emissions : 80 dB (typical) [USA], [GEN]
0.25 ΅W (=1 GHz), 1.0 ΅W (=1 GHz) [EUR]
• Adjacent channel power : 70 dB min (80 dB typical) for Wide and Middle
60 dB min (70 dB typical) for Narrow
• Audio harmonic distortion : 3% typical (Mod. 1 kHz, 40% deviation)
• Limiting charact of modulator : 60–100% of maximum deviation
• Microphone impedance : 2.2 k?
¦ RECEIVER
• Receive system : Double conversion superheterodyne system
• Intermediate frequencies : 1st IF: 46.35 MHz, 2nd IF: 450 kHz
• Sensitivity : 0.25 ΅V (–119 dBm) typical at 12 dB SINAD [USA], [GEN]
–4 dB΅V (–111 dBm) emf typical at 20 dB SINAD [EUR]
• Adjacent channel selectivity : 70 dB min (75 dB typical) for Wide and Middle
60 dB min (65 dB typical) for Narrow
• Spurious response : 70 dB
• Intermodulation rejection ratio : 70 dB min (74 dB typical) [USA], [GEN]
65 dB min (67 dB typical) [EUR]
• Audio output power : 0.5 W typical at 5% distortion with an 8 ? load
• Squelch sensitivity (at threshold) : 0.25 ΅V typical
• Output impedance (Audio) : 8 ?
Speci? cations are measured in accordance with EIA-152-C/204D, TIA-603 or EN 300 086.
All stated speci? cations are subject to change without notice or obligation.
SECTION 1 SPECIFICATIONS
VERSION WIDE MIDDLE NARROW
[USA], [GEN] 16K0F3E (25.0 kHz) N/A 11K0F3E (12.5 kHz)
[EUR] 14K0F3E (20.0 kHz) 8K50F3E (12.5 kHz)
RECEIVING TRANSMITTING
Stand-by Max. audio High (5 W) Low (1 W)
85 mA 300 mA 1.5 A 0.7 A
deviation meter
SINAD meter
Speaker (8 ?)
Audio generator
AC millivoltmeter
to the antenna connector
Attenuator
20 dB or 30 dB
RF power meter
0.1-10 W/50 ?
Frequency
counter
Standard signal generator
0.1 ΅V to 32 mV
(-127 dBm to -17 dBm)
CAUTION!
DO NOT transmit while
an SSG is connected to
the antenna connector.
To [SP]
IC-F33G/F34G
To [MIC]
JIG cable
to USB port
to RS-232C port
OPC-478 (RS-232C type)
OPC-478U (USB type)
OPC-478/OPC478U JIG cable
To IC-F33G/F34G
[SP] jack
3-conductor 3.5(d) mm (1/8") plug
(SP + )
(CLONE)
(SPE - )
• CONNECTION
• JIG CABLE
1-1-32, Kamiminami, Hirano-ku, Osaka, 547-0003, Japan
S-14113IZ-C1
© 2004 Icom Inc.


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