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Make/Model Information:

  • Brand:   Icom
  • Models included:
    • Icom IC-F50
    • Icom IC-F51

File Information:

  • Type:   Factory Service Manual (FSM)
  • Language:   English (EN)
  • Number of pages:   38
  • File size:  ∼ 2.00 MB
  • File Format:   PDF only
  • SME Watermarks:   None
  • Password lock:   No
  • Edit/copy/modify:   Yes
  • SKU:   ROIC-0087

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
VHF TRANSCEIVER
INTRODUCTION
DANGER
ORDERING PARTS
REPAIR NOTES
This service manual describes the latest service information
for the IC-F50/IC-F51 VHF TRANSCEIVER 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 con-
necting the transceiver.
DO NOT apply an RF signal of more than 20 dBm (100mW)
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

5030002630 LCD L3-0048TAY-2 IC-F50 Front unit 5 pieces
8810010120 Screw BO 2x8 SUS ZK IC-F50 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 oblig-
ation.
MODEL VERSION SYMBOL
IC-F51
Europe
GEN General
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 TRANSMITER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
4-3 PLL CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
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 SEMI-CONDUCTOR INFORMATION
SECTION 9 BOARD LAYOUTS
9-1 MAIN UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1
9-2 FRONT UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3
9-3 VR BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-5
9-4 CONNECTOR BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-6
SECTION 10 BLOCK DIAGRAM
SECTION 11 VOLTAGE DIAGRAM
11-1 MAIN UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-1
11-2 RF UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-2
11-3 VR / CONNECTOR BOARDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-3
Icom, Icom Inc. and are registered trademarks of Icom Incorporated (Japan) in the United States, the United Kingdom,
Germany, France, Spain, ussia and/or other countries.
SECTION 1 SPECIFICATIONS
GENERAL
Frequency coverage : 136.000174.000 MHz
Mode : FM
Type of emission :
Number of conventional channels : 128 ch, 8banks
Antenna connector : SMA type (50 ?)
Operating temperature range : 30 C to +60C (22 F to +140F) [USA], [GEN]
25 C to +55C [EUR]
Power supply requirement : 7.2 V DC nominal (negative ground)
Current drain (at 7.2 V DC) :
Dimensions (projections not included) : 56.0(W)97.0(H)36.4(D) mm
27/32(W) ? 313/16(H) ? 17/16(D) in
Weight (Including BP-223) : Approximately 280 g (9.88 oz)
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 : 70 dB (typical) [USA], [GEN]
0.25 W (= 1 GHz), 1.0 W (= 1 GHz) [EUR]
Adjacent channel power : 70 dB min. (Wide, Middle), 60 dB min. (Narrow)
Audio harmonic distortion : 3 % typical (AF 1kHz, 40 % deviation)
1Hum and Noise ([USA], [GEN] only) : 40 dB min (46 dB typical) for Wide
(without CCITT filter) 34 dB min (40 dB typical) for Narrow
1Residual modulation ([EUR] only) : 45 dB min (55 dB typical) for Wide
(with CCITT filter) 43 dB min (53 dB typical) for Middle
40 dB min (50 dB typical) for Narrow
Limiting charact of modulator : 60100 % 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]
0.63 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]
1Hum and Noise ([USA], [GEN] only) : 40 dB min (45 dB typical) for Wide
(without CCITT filter) 34 dB min (40 dB typical) for Narrow
1Hum and Noise ([EUR] only) : 45 dB min (55 dB typical) for Wide
(with CCITT filter) 43 dB min (53 dB typical) for Middle
40 dB min (50 dB typical) for Narrow
Audio output power : 0.5 W typical at 5% distortion with an 8 ? load
Squelch sensitivity (at threshold) : 0.25 V typical [USA], [GEN]
0.63 V (111 dBm) emf typical [EUR]
Output impedance (Audio) : 8 ?
Specifications are measured in accordance with EIA-152-C/204D, TIA-603 or EN 300 086.
All stated specifications are subject to change without notice or obligation.
VERSION
[USA], [GEN]
16K0F3E (25.0 kHz)
MIDDLE
14K0F3E (20.0 kHz)
NARROW
11K0F3E (12.5 kHz)
8K0F3E (12.5 kHz)
RECEIVING TRANSMITTING
Stand-by
Max. audio
300 mA
High (5 W)
Low (1 W)
VHF B6034B
9-3 VR BOARD
TOP VIEW
BOTTOM VIEW
1-1-32, Kamiminami, Hirano-ku, Osaka, 547-0003, Japan
S-14007IZ-C1
2003 Icom Inc.


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