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Make/Model Information:

  • Brand:   Icom
  • Models included:
    • Icom IC-F4GT
    • Icom IC-F4GS

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-0084

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 FM TRANSCEIVERS




















INTRODUCTION
DANGER
ORDERING PARTS
REPAIR NOTES
This service manual describes the latest service information
for the IC-F4GT and IC-F4GS at the time of publication.
NEVER connect the transceiver to an AC outlet or to a DC
power supply that uses more than 16 V. Such a connection
could cause a fire hazard and/or electric shock.
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 (100mW) to the antenna connector. This could damage the transceiv-
er’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

1130007610 S.IC µPD3140GS IC-F4GT MAIN UNIT 1 pieces
8810009510 Screw BT M2 x 4 NI-ZU IC-F4GS 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 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, all electrical or mechanical parts and
internal circuits are subject to change without notice or oblig-
ation.
IC-F4GT IC-F4GS
TABLE OF CONTENTS
SECTION 1 SPECIFICATIONS
SECTION 2 INSIDE VIEWS
SECTION 3 DISASSEMBLY AND OPTION INSTRUCTIONS
3-1 DISASSEMBLY INSTRUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
3-2 OPTIONAL UNIT INSTALLATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2
SECTION 4 CIRCUIT DESCRIPTION
4-1 RECEIVER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
4-2 TRANSMITTER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
4-3 PLL CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2
4-4 POWER SUPPLY CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3
4-5 CPU PORT ALLOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-4
SECTION 5 ADJUSTMENT PROCEDURES
5-1 PREPARATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1
5-2 PLL ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-4
5-3 SOFTWARE ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-5
SECTION 6 PARTS LIST
SECTION 7 MECHANICAL PARTS AND DISASSEMBLY
SECTION 8 SEMI-CONDUCTOR INFORMATION
SECTION 9 BOARD LAYOUTS
SECTION 10 BC-137 OPTIONAL DESKTOP CHARGER INFORMATION
10-1 PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-1
10-2 DISASSEMBLY INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-1
10-3 VOLTAGE DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-2
10-4 BOARD LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-2
SECTION 11 BLOCK DIAGRAM
SECTION 12 VOLTAGE DIAGRAM
SECTION 1 SPECIFICATIONS
‘ GENERAL
• Frequency coverage : 440.000–470.000 MHz
• Type of emission : 8K50F3E
• Number of channels : 32 ch (16 channels
• Power supply requirement : 7.2 V DC (negative ground; supplied battery pack)
• Current drain (approx.) : Transmit at High (4.0 W) 1.55 A
at Low (1.0 W) 800 mA
Receive rated audio 250 mA
stand-by 70 mA
• Frequency stability : ±0.00025 %
• Usable temperature range : –30°C to +60°C; –22°F to +140°F
• Dimensions (projections not included) : 54(W)
• Weight (with ant., BP-209) : 355 g; 12.5 oz.
‘ TRANSMITTER
• RF output power (at 7.2 V DC) : 4 W / 1 W (High / Low)
(with supplied battery pack)
• Modulation system : Variable reactance frequency modulation
• Maximum frequency deviation : ±2.5 kHz
• Spurious emissions : 73 dBc (typical)
• Adjacent channel power : 60 dB (typical)
• Transmitter audio distortion : Less than 3% at 1 kHz, 40% deviation
• Limitting charact of modulator : 70–100% of max. deviation
• Ext. microphone connector : 3-conductor 2.5(d) mm ( 1/10”)/2.2 k
‘‘ RECEIVER
• Receive system : Double conversion superheterodyne system
• Intermediate frequencies : 1st 46.35 MHz
2nd 450 kHz
• Sensitivity : 0.3 µV at 12 dB SINAD (typical)
• Squelch sensitivity : 0.3 µV at threshold (typical)
• Adjacent channel selectivity : 65 dB (typical)
• Spurious response rejection : 70 dB (typical)
• Intermodulation rejection ratio : 70 dB (typical)
• Hum and noise : 40 dB (typical)
• Audio output power (at 7.2 V DC) : 500 mW typical at 5% distortion with an 8 load
• Ext. speaker connector : 3-conductor 3.5(d) mm ( 1/8”)/8
Specifications are measured in accordance with EIA/TIA-603.
All stated specifications are subject to change without notice or obligation.
10 - 1
SECTION 10 BC-137 OPTIONAL DESKTOP CHARGER INFORMATION
REF. NO. ODER NO. DESCRIPTION QTY.
MP1 8010018030 2338 case 1
MP2 8110007080 2338 cover 1
MP3 8930050920 2327 spacer 1
MP4 8930039620 Leg cushion (A) 4
MP5 8810008660 Screw BT M3 x 8 NI-ZU 1
[CHASSIS UNIT]
10-1 PARTS LIST 10-2 DISASSEMBLY INFORMATION
MP1 (C)
MP1 (M)
MP2 (C)
MP5 (C)
MP4 (C)
MP4 (C)
MP3 (C)
MAIN unit
MP4 (C)
S.=Surface mount
REF. NO. ODER NO. DESCRIPTION QTY.
[MAIN UNIT]
Q1 1520000650 S.TRANSISTOR 2SB1201-S-TL 1
Q2 1590000480 S.TRANSISTOR RN2402 (TE85R) 1
Q3 1590000510 S.TRANSISTOR RN1409 (TE85R) 1
Q4 1530001950 S.TRANSISTOR 2SC2712-GR (TE85R) 1
D1 1750000550 S.DIODE 1SS355 TE-17 1
D2 1750000020 S.DIODE 1SS184 (TE85R) 1
D3 1790000950 S.ZENER MA8056-M (TX) 1
R1 7030010000 S.RESISTOR MCR10EZHF 24R0 (240) 1
R2 7030010000 S.RESISTOR MCR10EZHF 24R0 (240) 1
R3 7030000190 S.RESISTOR MCR10EZHJ 27 (270) 1
R4 7030000500 S.RESISTOR MCR10EZHJ 10 k 1
R5 7030000500 S.RESISTOR MCR10EZHJ 10 k 1
R6 7030000190 S.RESISTOR MCR10EZHJ 27 (270) 1
R7 7030001740 S.RESISTOR MCR10EZHJ 2 k 1
R8 7030001740 S.RESISTOR MCR10EZHJ 2 k 1
R9 7030000590 S.RESISTOR MCR10EZHJ 56 k 1
R10 7030000500 S.RESISTOR MCR10EZHJ 10 k 1
R11 7030000380 S.RESISTOR MCR10EZHJ 1 k 1
C1 4030001150 S.CERAMIC GRM40 F 104Z 25PT 1
C2 4030001150 S.CERAMIC GRM40 F 104Z 25PT 1
C3 4030001150 S.CERAMIC GRM40 F 104Z 25PT 1
C4 4030001150 S.CERAMIC GRM40 F 104Z 25PT 1
J1 6510021470 CONNECTOR HEC0470-01-230 1
J2 6510021470 CONNECTOR HEC0470-01-230 1
DS1 5040001390 LED TLG124A 1
W1 7030003970 S.JUMPER MCR18EZHJ JPW (000) 1
EP1 0910052602 PCB B 5493B 1
EP2 6910012240 SPACER TLE60-05 1
MP1 8930051340 2338 TERMINAL 3
Screw abbreviations BT : Self-tapping
NI : Nickel
NOTE: (C) : CHASSIS
(M) : MAIN UNIT
CONVENIENT:
BC-137 is connectable max. 6 pieces in parallel.
When connect BC-137 in parallel, JIG cable (as shown
below) is required.
AC adaptor (BC-122)
or DC power supply JIG cable
BC-137
BC-137
• CONNECTION
BC-137
– ( GND)
+ ( 13.8 V)
• JIG CABLE
AP-301 (Order No: 5610000010)
Max. 6 pieces of BC-137
6-9-16, Kamihigashi, Hirano-ku, Osaka, 547-0002, Japan
S-13610IZ-CD
© 2000 Icom Inc.


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