Icom IC-F5021, IC-F5026, IC-F5022, IC-F5023, IC-F5028H Service Manual
...
S-14524XZ-C1
Feb. 2009
VHF MOBILE TRANSCEIVERS
This service manual describes the latest technical
information for the IC-F5021 IC-F5022 IC-F5023/H
IC-F5026/H IC-F5028H VHF MOBILE TRANSCEIVERS at
the time of publication.
NEVER connect the transceiver to an AC outlet or to a DC
power supply that uses more than specified. This will ruin
the transceiver.
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 dm (100 mW) to
the antenna connector. This could damage the transceiver’s
front-end.
To upgrade quality, any electrical or mechanical parts
and internal circuits are subject to change without notice
or obligation.
MODEL VERSION
CHANNEL
SPACINGTXPOWER
FREQUENCY
RANGE
F5021 [USA-01] 12.5/25.0 50 W
136–174 MHz
F5022 [EUR-01]
12.5/20.0/
25.0
25 W
F5023 [EXP-01]
12.5/25.0
F5023H [EXP-02] 50 W
F5026 [RUS-01] 25 W
146–174 MHz
F5026H [RUS-02]
50 W
F5028H [CHN-01] 136–174 MHz
Be sure to include the following four points when ordering
replacement parts:
1. 10-digit Icom parts numbers
2. Component name
3. Equipment model name and unit name
4. Quantity required
<ORDER EXAMPLE>
1110003491 S.IC TA31136FNG IC-F5021 MAIN UNIT 5 pieces
8820001210 Screw 2438 screw IC-F5023H Top cover 10 pieces
Addresses are provided on the inside back cover for your
convenience.
Icom, Icom Inc. and ICOM logo are registered trademarks of Icom Incorporated (Japan) in the United States, the United
Kingdom, Germany, France, Spain, Russia and/or other countries.
ORDERING PARTS
1. Make sure that the 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 Standard Signal
Generator or a Sweep Generator.
7. ALWAYS connect a 50 dB to 60 dB attenuator between
the transceiver and a Deviation Meter or Spectrum
Analyzer when using such test equipment.
8. READ the instructions of test equipment throughly
before connecting a test equipment to the transceiver.
REPAIR NOTES
INTRODUCTION CAUTION
UNIT ABBREVIATIONS:
F=FRONT UNIT
M=MAIN UNIT
TABLE OF CONTENTS
SECTION 1 SPECIFICATIONS
SECTION 2 INSIDE VIEWS
SECTION 3 DISASSEMBLY INSTRUCTION
SECTION 4 OPTIONAL UNIT INSTALLATION
SECTION 5 CIRCUIT DESCRIPITON
5-1 RECEIVER CIRCUITS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
5-2 TRANSMITTER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
5-3 FREQUENCY SYNTHESIZER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
5-4 VOLTAGE DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
5-5 PORT ALLOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5
SECTION 6 ADJUSTMENT PROCEDURE
6-1 PREPARATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
6-2 FREQUENCY ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4
6-3 TRANSMIT ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5
6-4 RECEIVE ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6
SECTION 7 PARTS LIST
SECTION 8 MECHANICAL PARTS
SECTION 9 BOARD LAYOUTS
SECTION 10 GENERAL WIRING
SECTION 11 BLOCK DIAGRAM
SECTION 12 VOLTAGE DIAGRAM
1 - 1
SECTION 1. SPECIFICATIONS
[USA], [RUS], [CHN], [EXP] [EUR]
GENERAL
• Frequency coverage 136–174 MHz [USA], [CHN], [EXP]
146–174 MHz [RUS]
136–174 MHz
• Type of emission Wide 16K0F3E (25.0 kHz)
Middle – 14K0F3E (20.0 kHz)
Narrow 11K0F3E (12.5 kHz) 8K50F3E (12.5 kHz)
• Number of programable channels 128 channels (8 zones)
• Antenna impedance
50 Ω (nominal)
• Operating temperature range –30˚C to +60˚C (−22˚F to +140˚F) –25˚C to +55˚C
• Power supply requirement (nominal) 13.6 V DC (Negative ground) 13.2 V DC (Negative ground)
• Current drain
(approx.)
RX
Stand-by 300 mA
Max.audio 1200 mA
TX
at 25 W 7.0 A
at 50 W 14.0 A
• Dimensions
(projections not included)
[25 W ver.]
150 (W) × 40 (H) × 117.5 (D) mm; (5 29/32 (W) × 1 9/16 (H) × 4 5/8 (D) in)
[50 W ver.]
150 (W) × 40 (H) × 167.5 (D) mm;
(5
29
/32 (W) × 1 9/16 (H) × 6 19/32 (D) in)
–
• Weight
[25 W ver.] 0.8 kg (1
3
/
4
Ib) 0.8 kg
[50 W ver.] 1.1 kg (2
7
/
16
Ib) –
TRANSMITTER
• Transmit output power [25 W ver.] 25 W (High), 10 W (Low2), 2.5 W (Low1)
[50 W ver.] 50 W (High), 25 W (Low2), 5.0 W (Low1) –
• Modulation Variable reactance frequency modulation
• Max. permissible deviation Wide ±5.0 kHz
Middle – ±4.0 kHz
Narrow ±2.5 kHz
• Frequency error ±2.5 ppm ±1.5 kHz
• Spurious emission 70 dB typ. 0.25 μW (≤1 GHz), 1.0 μW (>1 GHz)
• Adjacent channel power Wide 70 dB min.
Middle – 70 dB min.
Narrow 60 dB min.
• Audio frequency response +1 dB to –3 dB of 6 dB/octave (from 500–2500 Hz)
• Audio harmonic distortion 3% typ. (with 1 kHz AF 40% deviation)
• FM hum and noise
(without CCITT filter)
Wide More than 40 dB (46 dB typ.) –
Narrow More than 34 dB (40 dB typ.) –
• Residual modulation
(with CCITT filter)
Wide – More than 45 dB (55 dB typ.)
Middle – More than 43 dB (53 dB typ.)
Narrow – More than 40 dB (50 dB typ.)
• Limiting charact of modulation 70–100% of max. deviation
• Microphone impedance 600
Ω
1 - 2
[USA], [RUS], [CHN], [EXP] [EUR]
RECEIVER
• Receive system Double-conversion superheterodyne
• Intermediate frequencies 1st IF; 46.35 MHz, 2nd IF; 450 kHz
• Sensitivity 0.25 μV typ. at 12 dB SINAD −4 dBμV (EMF) typ. at 20 dB SINAD
• Squelch sensitivity (at threshold) 0.25 μV typ. −4 dBμV (EMF) typ.
• Adjacent channel
selectivity
Wide More than 70 dB (75 dB typ.) Other than [RUS]
82 dB typ. [RUS]
Middle − More than 70 dB (75 dB typ.)
Narrow More than 60 dB (65 dB typ.)
• Spurious response 70 dB min.
• Intermodulation More than 70 dB (75 dB typ.) More than 65 dB (67 dB typ.)
• FM hum and noise
(without CCITT filter)
Wide More than 40 dB (45 dB typ.) –
Narrow More than 34 dB (40 dB typ.) –
• Residual modulation
(with CCITT filter)
Wide – More than 45 dB (55 dB typ.)
Middle – More than 43 dB (53 dB typ.)
Narrow – More than 40 dB (50 dB typ.)
• Audio output power 4.0 W typ. at 5% distortion with a 4 Ω load
• Audio output impedance 4
Ω
2 - 1
SECTION 2. INSIDE VIEWS
• FRONT UNIT
(TOP VIEW)
CPU
(IC1)
LCD DRIVER
(IC6)
TONE LPF
(IC5)
TONE FILTER SWITCH
(Q3)
EEPROM
(IC3)
CLOCK FREQUENCY
SHIFT DIODE
(D6)
BACKLIGHT CONTROLLER
(Q5)
DIMMER CONTROLLER
(Q2)
BACKLIGHT DRIVER
(Q1)
RESET IC
(IC2)
2 - 2
• MAIN-A UNIT
(TOP VIEW)
IF IC
(IC1)
LPF
(Q39)
PLL IC
(IC4)
CPU5 LINE REGULATOR
(IC10)
RIPPLE FILTER
(Q17)
VCO SWITCH
(Q15)
POWER SWITCH
(Q23)
+8 REGULATOR
(IC9)
LOCK VOLATGE BUFFER
(Q18)
WIDE/NARROW
PHASE SHIFTER SWITCH
(Q5)
R8 REGULATOR
(Q30)
POWER SWITCH
(Q24)
APC AMP
(IC2)
WIDE/NARROW
2ND IF FILTER SWITCH
(Q40)
1ST IF FILTER
(FI1)
2 - 3
VCO
• MAIN-A UNIT
(BOTTOM VIEW)
AF/TONE FILTER
(IC16)
AF POWER AMP
(IC8)
AF MUTE SWITCH
(Q35, Q36)
Ext. MODULATION
LINE SWITCH
(Q31)
REFERENCE FREQUENCY
OSCILLATOR (X2)
REFERENCE OSCILLATOR
MODULATION AMP
(IC19)
D/A CONVERTER
(IC18)
AF PRE-AMP
(IC15)
EXPANDER
(IC17)
ANALOG SWITCH
(IC14)
D/A CONVERTER
(IC20)
DRIVE AMP
(Q9)
RF AMP
(Q9)
1ST MIXER
(Q3)
2ND IF FILTER
(FI2)
2ND IF FILTER
(FI6)
+5V REGULATOR
(Q27,Q28)
T8 REGULATOR
(Q25)
3 - 1
SECTION 3. DISASSEMBLY INSTRUCTION
FLAT
CABLE
TOP COVER
FRONT PANEL
SPEAKER
CABLE
MAIN UNIT
UNSOLDER
Solder
remover
MAIN UNIT
MAIN UNIT
1) Unscrew 4 screws from the top cover, and remove the top
cover.
2) Disconnect the fl at cable and speaker cable.
3) Unscrew 2 screws from the both sides, and remove the
front panel in the direction of the arrow.
5) Unscrew 9 screws from the MAIN UNIT.
6) Unsolder total of 9 points; 3 points at the antenna
connector, 6 points at the PA module.
7) Take off the MAIN UNIT from the CHASSIS.
4 - 1
SECTION 4 OPTIONAL PRODUCTS INSTALLATION
Install optional UT-108 as follows;
1) Turn the transceiver OFF, then disconnect the DC cable.
2) Unscrew 4 screws, then remove the bottom cover.
3) Install the unit as shown below.
4) Recover the bottom cover, screws and DC power cable.
Install optional OPC-1939 as follows;
1) Turn the transceiver OFF, then disconnect the DC power
cable.
2) Unscrew 4 screws, then remove the bottom cover.
3) Install the cable as shown below.
Install optional UT-109R or UT-110R as follows;
1) Turn the transceiver OFF, then disconnect the DC power
cable.
2) Unscrew 4 screws, then remove the bottom cover.
3) Cut the pattern on the PCB at "MIC" and "DISC" as
showon below.
4) Install the unit as shown below.
5) Recover the bottom cover, screws and DC power cable.
OPC-1939
Cut off the bushing as in the illustration,
when you install the optional OPC-1939.
K
I
MIC
DISC
4) Cut or short the patterns as below. (For AF output)
6) Recover the bottom cover, screws and DC power cable.
NOTE: Be sure to recover the patterns when you remove the optional product. Otherwise no TX modulation or AF output is available.
Solder
remover
D
5) Short the pattern as below. (For modulation input)
5 - 1
1ST IF CIRCUITS
The RX signals from the BPF are mixed with the 1st LO
signals to be converted into the 46.35 MHz 1st IF signal.
The 1st LO signals are generated by the RX VCO (Q14,
D33, D34, L26, L39, etc.), and passed through the LO SW
(D15) and attenuator, then applied to the 1st mixer (Q3)
The converted 1st IF signal is filtered by the crystal filter (FI1)
and amplified by the 1st IF AMP (Q4), then applied to the IF
IC (IC1).
5-1 RECEIVER CIRCUITS
RF CIRCUITS
RF signals from the antenna are passed through the LPF (as
the harmonic filter for transmitting) and antenna SW, then
applied to the RX BPF circuit.
The applied RX signals are passed through the 2-staged
tuned BPF (D4, D8) to remove unwanted out-of-band
signals, and amplified by the low-noise RF AMP (Q2), then
applied to the 1st mixer (Q3) via another 2-staged tuned
BPF (D9, 10).
Total of 4 stage BPF are tuned to the RX frequency by the
tuning voltage “T1” and “T2” from the D/A converter (IC20),
to obtain required IMD characteristic.
2ND IF AND DEMODULATOR CIRCUITS
The amplified 1st IF signal is mixed with the 2nd LO signal
at the internal 2nd IF mixer of the IF IC (IC1), to obtain the
450 kHz 2nd IF signal.
The 15.3 MHz signal generated by the reference oscillator
(X2) is passed through the filter AMP (Q34, L33, 35, C305–
308) to extract the 45.9 MHz 3rd harmonic component. The
45.9 MHz signal is then applied to pin 2 of IF IC (IC1) as
the 2nd LO signal.
The converted 2nd IF signal is output from pin 3 of IF IC
(IC1), and filtered by the ceramic filters (FI2 and FI6 for
Narrow mode; FI2 only for Wide mode) to remove unwanted
out-of-band signals, then applied to the internal frequencydemodulator of IF IC (IC1) from pin 5.
The demodulator is a quadrature type which uses X1 as the
phase shifter.
The frequency-demodulated AF signals are output from pin 9
to AF circuits.
• RF CIRCUITS
• 2ND IF AND DEMODULATORCIRCUITS
• 1ST IF CIRCUITS
SECTION 5. CIRCUIT DESCRIPTION
LPFLPF
PWR
DET
D1,D11
ANT
SW
D2,3,5,6,48
BPF
D10
BPF
D9
BPF
D4
BPF
D8
RF
AMP
Q2
AGC
Q1
Tuning voltage “T2”
To 1st IF circuits
Tuning voltage “T1”
136-174 MHz
RSSI
From the TX AMP
TX/RX
SW
D15
Q3
1st mixer
BPF
XTAL
FI1
IF
AMP
Q4
LPF
From RF circuits
To IF IC
46.35 MHz
1st LO signals
(182.35 MHz-220.35 MHz)
REF
X2
X3
Q34
X1
BPF
BPF
CERAMIC
FI6
W/N
SW
Q5
BPF
CERAMIC
FI2
W/N
SW
D56
Q40
W/N
SW
D57
D/A
IF IC
From 1st IF circuits
IC1:TA31136FN
IC18
AK2330
NWC
15.3MHz
45.9MHz
DISC
SQIN
450kHz
To the AF circuits
NWC
5 - 2
• RX AF CIRCUITS
AF CIRCUITS
The demodulated AF signals from the IF IC (IC1) are
amplified and filtered by the HPF (IC16), and passed
through the AF line SW (IC14) and LPF (IC16). The filtered
AF signals are adjusted its level (=loudness) by the D/A
converter (IC18), and applied to the AF AMP (IC15) via the
AF line SW (IC14).
The amplified AF signals are applied to the AF power AMP
(IC8) and power-amplified to obtain AF output level.
The power-amplified AF signals are applied to the internal
speaker on the FRONT UNIT or output from the external
speaker jack on the rear panel.
SIGNALING (DECODING)
Demodulated signals from pin 9 of the IF IC (IC1) are
passed through the LPF to extract tone signals contained in
the demodulated signals.
2/5 tone signals are extracted by the LPF (IC16). CTCSS/
DTCS signals are extracted by the LPF (Q39).
These extracted tone signals are applied to the CPU (FRONT
UNIT: IC1) for decoding.
LPF
IC16
LPF
IC16
LPF
Q39
HPF
IC16
AF
AMP
IC15
AF
POWER
AMP
IC8
LA4425A
AF
MUTE
Q35,36,D29
Int. speaker
Ext. speaker jack
J4
ANALOG
SW
SDEC
To CPU (FRONT UNIT: IC1)
CDEC
IC14
CD4066
D/A
IC18
AK2330
(2/5 TONE signals)
(TCSS/DTCS signals)
FRONT UNIT
AF ON
DISC
From the IF IC
DISC
DISC
VRAF
TMONI
RXAF
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