Icom IC-F4TR User manual

UHF TRUNKED RADIO
iC-f4tr

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 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 signal generator or a sweep generator.
7. ALWAYS connect a 40 dB or 50 dB attenuator between the transceiver and a deviation meter or spectrum analyser 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.
DANGER
NEVER connect the transceiver to an AC outlet or to a
DC power supply that uses more than 10 V. This will ruin
the transceiver.
DO NOT expose the transceiver to rain, snow or any
liquids.
DO NOT reverse the polarrities of the power supply
when connecting the tranceiver.
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.
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
<SAMPLE ORDER>
1110001810 S.IC TA7368F IC-F4TR MAIN UNIT 1 piece
8810009560 Screw PH B0 2 ×6 ZK IC-F4TR CHASSIS 6 pieces
Addresses are provided on the inside back cover for your
convenience.
INTRODUCTION
This service manual describes the latest service information
for the IC-F4TR UHF TRUNKED RADIO at the time of
publication.
24 keys 7 keys

TABLE OF CONTENTS
SECTION 1 SPECIFICATIONS
SECTION 2 INSIDE VIEWS
SECTION 3 DISASSEMBLY INSTRUCTION
SECTION 4 CIRCUIT DESCRIPTION
4 – 1 RECEIVER CIRCUITS ................................................................................................................... 4 – 1
4 – 2 TRANSMITTER CIRCUITS ............................................................................................................ 4 – 2
4 – 3 PLL CIRCUIT ................................................................................................................................. 4 – 3
4 – 4 POWER SUPPLY CIRCUITS ......................................................................................................... 4 – 3
4 – 5 CPU PORT ALLOCATIONS ........................................................................................................... 4 –
SECTION 6 PARTS LIST
SECTION 7 MECHANICAL PARTS AND DISASSEMBLY
SECTION 8 SEMI-CONDUCTOR INFORMATIONS
SECTION 9 BOARD LAYOUTS
9 – 1 MAIN UNIT ..................................................................................................................................... 9 –
9 – 2 VR BOARD .................................................................................................................................... 9 –
SECTION 10 BLOCK DIAGRAM
SECTION 11 VOLTAGE DIAGRAM

All stated specifications are subject to change without notice or obligation.
‘‘GENERAL
Frequency coverage : 450.000–490.000 MHz
Type of emission : 16K0F3E (25 kHz)
11K0F3E (12.5 kHz)
Antenna impedance : 50 Ωnominal
Power supply requirement : 9.6 V DC (negative ground; supplied battery pack)
Current drain at 9.6 V DC (approx.) : Transmit 1.4 A (at 4 W)
700 mA (at 1W)
Receive 280 mA (max. audio)
110 mA (stan-by)
Frequency error : ±2.5 ppm
Usable temperature range : –30˚C to +60˚C; +22˚F to +140˚F
Dimensions (proj. not included) : 57(W) ×140(H) ×37(D) mm; 21⁄4(W) ×51⁄2(H) ×115⁄32(D) inch
Weight (BP-196) : 390 g; 13.8 oz
‘‘TRANSMITTER
Output power : High 4 W
Low 1 W
Modulation system : Variable reactance frequency modulation
Max. frequency deviation : ±5.0 kHz (25 kHz)
±2.5 kHz (12.5 kHz)
Spurious emissions : 70 dB typical
Adjacent channel power : 75 dB typical (25 kHz)
70 dB typical (12.5 kHz)
Transmitter audio distortion : Less than 5 % at 1 kHz, 60 % deviation
Residual modulation : 40 dB (25 kHz)
34 dB (12.5 kHz)
Limitting charact of modulator : 60–100 % of max.deviation
Ext. microphone connector : 3-conductor 2.5(d) mm (1⁄10")/2 kΩ
‘‘RECEIVER
Receive system : Double-conversion superheterodyne system
Intermediate frequencies : 1st IF 47.250 MHz, 2nd IF 450 kHz
Sensitivity : 0.3 µV at 12 dB SINAD
Squelch sencitivity (at threshold) : 0.3 µV typical
Adjcent channel selectivity : 70 dB typical (25 kHz)
65 dB typical (12.5 kHz)
Spurious response : 70 dB typical
Inter moduration rejection ratio : 75 dB typical
Hum and noise : 48 dB typical (25 kHz)
34 dB typical (12.5 kHz)
Audio output power (at 9.6 V DC) : 500 mW typical at 5% distortion with an 8 Ωload
Ext. speaker connecter : 3-conductor 3.5(d) mm (1⁄8")/8 Ω
Measurements made in accodance with EIA/TIA-603
SECTION 1 SPECIFICATIONS

ew abbreviations: PH: Pan head B0: Self-tapping
NI : Nickel ZK: Black
SECTION 7 MECHANICAL PARTS AND DISASSEMBLY
7-1 CABINET PARTS 7-2 ACCESSORIES
MP1 8010016822 1922 chassis-2 1
MP2 8210014731 1922 front panel (B) assembly [24 keys] 1
8210015161 2066 front panel (A) assembly [7 keys] 1
MP4 8210014330 1922 contact base 1
MP5 8610010420 Knob N-261 1
MP6 8930051540 1922 10-key (B) [24 keys] 1
8930043970 2065 7-key [7 keys] 1
MP7 8930042070 1922 MIC cap 1
MP9 8930042030 1922 main seal 1
MP10 8110006050 1922 OPT cover 1
MP11 8930042050 1922 DC cap 1
MP12 8930042090 1922 plus terminal 1
MP13 8930042080 1922 minus terminal 1
MP17 8310048520 1922 window plate (I) 1
MP19 8930051530 1922 rear sheet (AV) 1
MP21 8930042350 1922 MIC sheet 1
MP22 8930042560 1922 OPT sheet 1
MP24 8830001250 Nut ANT connector-101 1
MP25 8830001010 Hex nut (A) 1
MP26 8810000100 Screw PH M2 ×4 ZK 2
MP27 8810009510 Screw B0 2 ×4 NI-ZU (BT) 6
MP28 8810009510 Screw PH B0 2 ×4 NI-ZU (BT) 1
MP29 8810009510 Screw PH B0 2 ×4 NI-ZU (BT) 2
MP30 8810009560 Screw PH B0 2 ×6 ZK (BT) 2
MP31 8810009560 Screw PH B0 2 ×6 ZK (BT) 2
MP34 8930043210 1922 A-rear sheet 1
MP36 8950004671 ANT connector-101A 1
MP37 8510011260 1923 shield cover 1
38 8930043760 1923 MIC seal 1
39 8930052330 Sponge (GN) 1
40 8930043610 Isolating sheet (EZ) 1
REF ORDER DESCRIPTION
NO. NO. QTY.
[CHASSIS PARTS]
EP1
Optional product Antenna FA-SC56U-2 1
EP2
Optional product Battery BP-196 1
MP1
Optional product 1922 belt clip 1
REF ORDER DESCRIPTION QTY.
NO. NO.
EP2 EP1
MP1 MP2
5030001640 LCD LM-1761B 1
2510000960 K036NA500-26A27 1
8930042590 LCD contact SRCN-1922-SP-N-W 1
8510011111 1922 VCO case-1 1
2 8930042060 1922 LCD holder 1
M 3 8210014380 1922 Reflector 1
MP4 8410002081 1922 PA heatsink-1 1
MP6 8510011180 1923 VCO cover 1
MP7 8510011230 1923 VCO shield 1
MP8 8930046590 Sponge (FO) 1
MP9 8510009971 1591 shield plate-1 1
MP10 8930038670 Ferrite sheet 1
EF ORDER DESCRIPTION
O. NO. QTY.
AIN UNIT]

S-13606MS-CD
© 2000 Icom Inc.
6-9-16, Kamihigashi, Hirano-ku, Osaka 547-0002, Japan

Icom IC-F4TR Service Manual
Icom IC-F4TR Service Manual
Icom IC-F4TR Service Manual
Icom IC-F4TR Service Manual
Icom IC-F4TR Service Manual
Icom IC-F4TR Service Manual
Icom IC-F4TR Service Manual
Icom IC-F4TR Service Manual
Icom IC-F4TR Service Manual