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Make/Model Information:

  • Brand:   Icom
  • Models included:
    • Icom IC-F21 series
    • Icom IC-F22 series

File Information:

  • Type:   Factory Service Manual (FSM)
  • Language:   English (EN)
  • Number of pages:   40
  • File size:  ∼ 1.70 MB
  • File Format:   PDF only
  • SME Watermarks:   None
  • Password lock:   No
  • Edit/copy/modify:   Yes
  • SKU:   ROIC-0065

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 TRANSCEIVERS

INTRODUCTION
DANGER
ORDERING PARTS
REPAIR NOTES
This service manual describes the latest service information
for the IC-F21/IC-F21S/IC-F21BR/IC-F21GM/IC-F22/IC-
F22S/IC-F22SR at the time of publication.
NEVER connect the transceiver to an AC outlet or to a DC
power supply that uses more than 8.6 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

1130007020 S.IC TC7S66FU IC-F21 MAIN UNIT 1 piece
8810004860 Screw PH M 2 x 6 ZK IC-F21 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-F21/IC-F21GM/
IC-F22/IC-F22SR
IC-F21S/IC-F21BR/
IC-F22S
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2
4-3 PLL CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3
4-4 POWER SUPPLY CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-4
4-5 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
9-1 IC-F22/F22S/F22SR MAIN UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-1
9-2 IC-F21/F21S/F21BR/F21GM MAIN UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-3
9-3 SW-A AND SW-B UNITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-5
SECTION 10 BC-146 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
12-1 MAIN UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-1
12-2 SW-A AND SW-B UNITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12- 2
SECTION 1 SPECIFICATIONS
All stated specifications are subject to change without notice or obligation.
Frequency coverage
Type of emission
Number of channels
Power supply requirement
Antenna impedance
Input impedance (Mic)
Output impedance (Audio)
Intermediate frequency
Operating temperature range
High power
Low power
stand-by
Rated audio
Dimensions
(Projections not included)
RF output power (at 7.2 V DC)
Modulation system
Max. permissible deviation
External mic.connector
Frequency error
Spurious emissions
Adjacent channel power
Audio harmonics distortion
FM Hum and noise
Residual modulation
Limiting charact of modulator
Receive system
Intermediate frequencies
Sensitivity
Audio output power (at 7.2 V)
Adjacent channel selectivity
Spurious response
Intermodulation
FM Hum and noise (Typical)
Squelch sensitivity
EIA-152-C/204D or TIA-603 ETS 300 086/300 296
RECEIVER TRANSMITTER GENERAL
440.000 MHz470.000 MHz 440.000 MHz470.000 MHz
462.550 MHz469.550 MHz A 446.00625 MHz446.09375 MHz C
462.550 MHz467.725 MHz B
16K0F3E/8K50F3E (at 25 / 12.5 kHz: W/N-type), 8K50F3E (at 12.5 kHz: N-type)
2 ch. (IC-F21BR / F21S / F22S), 15 ch. (IC-F21GM / F22SR), 16 ch. (IC-F21 / F22)
7.2 V (negative ground)
50 normal
2.2 k normal
8 normal
1st: 46.350 MHz, 2nd: 450 kHz
30 C to +60 C (22F to +140F) 25 C to +55 C (13F to +131F)
1.6 A (4 W) except A, C; 1.2 A (2 W) except C; 0.5 A (0.5 W ERP) C only
0.8 A (1 W)
310 g; 10.1 oz (with BP-209), 300 g; 10.6 oz (with BP-222)
High: 4.0 W (A: 2.0 W, C: 0.5 W), Low1: 2.0 W (except A, C), low2: 1.0 W (except C)
Variable reactance frequency modulation
5.0 kHz (25 kHz), 2.5 kHz (12.5 kHz) (C: 2.5 kHz (12.5 kHz) only)
3-conductor 2.5 mm (1/10 in) (2 k)
2.5 ppm 1.5 kHz
73 dBc (typical) 0.25 W <= 1 GHz, 1.00 W > 1 GHz
70 dB*1 (25 kHz), 60 dB* 1 (12.5 kHz)
3 % typical at 1 kHz, 40 % deviation 5 % typical at 1 kHz 60 % deviation
46 dB typ. (25 kHz), 40 dB typ. (12.5 kHz)
45 dB typ. (25 kHz), 43 dB typ. (12.5 kHz)
70 % 100 % of max. deviation
Double-conversion super heterodyne
1st: 46.350 MHz, 2nd: 450 kHz
0.25 V (typical) for 12 dB SINAD
0.25 V (typical) for 12 dB SINAD 0.63 V EMF (typical) for 20 dB SINAD
(C: 26.5 dBV/m for 20 dB SINAD)
0.5 W at 5 % distortion with an 8 load, 0.6 W at 5 % distortion with 6 load
70 dB typ. (25 kHz), 65 dB typ. (12.5 kHz) 70 dB (25 kHz), 60 dB (12.5 kHz)
81.29 dBV/m
70 dB*1 (C: 91.29 dBV/m)
70 dB 65 dB (C: 86.29 dBV/m)
46 dB*2(25 kHz), 40 dB* 2(12.5 kHz) 45 dB typ.* 3(25 kHz), 43 dB typ.* 3(12.5 kHz)
0.3 V typical at threshold (C: 26.5 dBV/m at threshold)
Current drain
(at 7.2 V)
*1EIA-152-C/204D or TIA-603 is typical value, * 2EIA-152-C/204D only, *3With CCITT filter
A: [F21BR], B: [F21GM]], C: [F22SR]
BOTTOM VIEW
SW-A UNIT
SW-B UNIT
to the MAIN unit J2
to the MAIN unit J1
B5604C
to the MAIN unit J2
1-1-32, Kamiminami, Hirano-ku, Osaka, 547-0003, Japan
S-13806IZ-C1U
2001 Icom Inc.


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