Icom_Two-Way_Radio

INTRODUCTION

This service manual describes the latest service information for the IC-F3021T/S, IC-F3022T/S and IC-F3023T/S VHF FM TRANSCEIVERS at the time of publication.

To upgrade quality, any electrical or mechanical parts and internal circuits are subject to change without notice or obligation.

CAUTION

NEVER connect the transceiver to an AC outlet or to a DC power supply that uses more than 8 V. 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 dBm (100 mW) to the antenna connector. This could damage the trans- ceiver's front end.

ORDERING PARTS

Be sure to include the following four points when ordering replacement parts:

1.10-digit Icom parts numbers

2.Component name and informations

3.Equipment model name and unit name

4.Quantity required

Addresses are provided on the inside back cover for your convenience.

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 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.

Icom, Icom Inc. and logo are registered trademarks of Icom Incorporated (Japan) in the United States, the United Kingdom, Germany, France, Spain, Russia and/or other countries.

SECTION 3 DISASSEMBLY INSTRUCTIONS

1 REMOVING THE CHASSIS UNIT

q Unscrew ANT nut A, and remove knob B.

w Unscrew 2 screws C, and remove the jack panel.

eUnscrew 2 screws D, and unplug the connector E from the chassis unit.

rTake off the chassis unit in the direction of the arrow from the front panel.

e Unscrew 6 screws J.

r Remove the side plate I.

t Unsolder 8 points K, and remove the shield cover.

yUnsolder 8 points L, and take off the MAIN UNIT in the direction of the arrow.

2 REMOVING THE MAIN UNIT

q Remove the main seal F.

w Unscrew VR nut G, and remove the top plate H.

(Continued to right above)

CHASSIS UNIT

3 REMOVING THE PA UNIT

q Unscrew 3 screws M.

wUnsolder 4 points N, and take off the PA UNIT in the direction of the arrow.

PA UNIT

3 - 1

SECTION 4 OPTIONAL UNIT INSTALLATION

CAUTION! Optional unit installation should be done at authorized Icom servise center only.

Install the optional unit as follows.

q Rotate [VOL] to turn the power OFF, and remove the battery pack.

wRemove the unit cover as below. (The removed unit cover can not be used again.)

rInstall the unit as below.

UT-108R UT-109R UT-110R

e Cut the pattern on the PC board at ???MIC??? and ???DISC??? as below. (This modification is not necessary for UT-108R installation.)

t Remove the paper backing of the supplied unit cover, and attach the unit cover and the battery pack, then rotate [VOL] to turn the power ON.

y Set or modify the scrambler or decoder settings using optional CS-F3020.

NOTE: When uninstalling the unit

Be sure to re-solder the cut points as below when you remove the unit. Otherwise, no transmit modulation or receive AF output is available.

Re-solder

4 - 1

SECTION 5 CIRCUIT DESCRIPTION

5-1 RECEIVER CIRCUITS

5-1-1 ANTENNA SWITCHING CIRCUIT (PA UNIT)

The antenna switching circuit toggles the receive (RX) line and transmit (TX) line.

The received signals from the antenna are passed through the low-pass filter (ANT UNIT; L801, L802, C802, C803, C807) and antenna switch (D701, D704, D706).

While transmitting, the voltage on the T5V line is applied to D701, D704 and D706, and these are ON. Thus the TX line is connected to the antenna. Simultaneously, the RX line is connected to the ground (GND) to prevent transmit signal entering.

While receiving, no voltage is applied to the D701, D704 and D706, and these are OFF. Thus the TX line and the antenna are disconnected to prevent received signals entering. Simultaneously, the RX line is disconnected from the GND and the received signals are passed through the low-pass filter (L712, L714, C750, C751). The ??? ltered signals are applied to the RF circuits.

5-1-2 RF CIRCUITS (MAIN UNIT)

RF circuits filter and amplify the received signals within the frequency coverage.

The received signals from the antenna switching circuit are passed though the two-staged bandpass filter (BPF; D19, D24, L7, L8, C22, C25, C27???C29, C369) to ??? lter-out unwanted signals, and the ??? ltered signals are applied to the RF ampli??? er (Q5). The ampli??? ed received signals are then applied to the 1st mixer (Q6) via another BPF (L47???L49, C19, C40, C437???C439, C443).

5-1-3 1st IF CIRCUITS (MAIN UNIT)

The received signals are converted into the 1st IF signal, ??? ltered and ampli??? ed at the 1st IF circuits.

The received signals from the BPF (L47???L49, C19, C40, C437 ???C439, C443) are applied to the 1st mixer (Q6) and converted into the 46.35 MHz 1st IF signal by being mixed with the local oscillator (LO) signal from the RX VCO (Q17, D9, D11, D33).

The converted 1st IF signal is passed through the 1st IF ??? lter (FI1) to filter-out adjacent signals, then applied to the 1st IF ampli??? er (Q7). The ampli??? ed 1st IF signal is then applied to the FM IF IC (IC9, pin 16).

5-1-4 2nd IF AND DEMODULATOR CIRCUITS (MAIN UNIT)

The 1st IF signal is converted into the 2nd IF signal, and demodulated.

The 1st IF signal from the 1st IF ampli??? er is applied to the 2nd mixer in the FM IF IC (IC9, pin 16), and converted into the 450 kHz 2nd IF signal by being mixed with the 45.9 MHz 2nd LO signal from the reference frequency oscillator (X2) via the tripler (Q22) and BPF (L33, C163, C164, C166). The converted 2nd IF signal is output from pin 3, and passed through the 2nd IF ??? lters to remove sideband noise.

The 2nd IF signal is passed through the 2nd IF ??? lter (FI2) and applied to the FM IF IC (IC9, pin 5) again. The ??? ltered 2nd IF signal is ampli??? ed at the limiter ampli??? er, and FM-demodulated by the quadrature detector (IC9, pins 10, 11, X1). The demodulated AF signals are output from pin 9, then applied to the AF ampli??? er circuits.

5-1-5 AF AMPLIFIER CIRCUITS (MAIN UNIT)

The demodulated AF signals from the FM IF IC are ampli??? ed and ??? ltered at AF circuits.

The demodulated AF signals from the FM IF IC (IC9, pin 9) are passed through high-pass ??? lter (HPF; IC5, pins 2, 1) to remove tone signals. The filtered AF signals are passed through the de-emphasis circuit (R142, C249) to obtain the 6 dB/oct of frequency characteristic. The de-emphasized AF signals are passed through the RX mute switch (Q32, Q33), AF switch (Q36, Q37), HPF (IC5, pins 13, 14), analog switch (IC3, pins 1, 2), AF mixer (IC5, pins 6, 7) and analog switch (IC3, pins 10, 11) in sequence.

5 - 1

The AF signals from the analog switch (IC3, pin 11) are applied to the volume buffer ampli??? er (IC6, pin 9). The buffer- amplified AF signals are adjusted its level (= audio level) by volume control pot (R315), then applied to the AF power amplifier (IC15, pin 4) and amplified to the 0.5 W of audio output power (max., at 8 ?? load).

The power-ampli??? ed AF signals are output from pin 10, then applied to the internal speaker (CHASSIS; SP1) or an external speaker via [SP] jack (J2).

5-2 TRANSMITTER CIRCUITS

5-2-1 MICROPHONE AMPLIFIER CIRCUITS (MAIN UNIT)

The AF signals from the microphone (MIC signals) are ??? ltered and level-adjusted at microphone ampli??? er circuits.

??? MIC SIGNALS

MIC signals from the microphone are applied to or bypassed the ALC (Automatic Level Control) circuit (IC24, pins 3, 5) and the A/D switch (IC25, pins 7, 1), then applied to the D/A converter (IC12, pin 1).

5-1-6 SQUELCH CIRCUITS (MAIN UNIT)

5-1-6-1 NOISE SQUELCH

The squelch mutes the AF output signals when no RF signal is received. By detecting noise components (around 30 kHz signals) in the demodulated AF signals, the squelch circuit toggles the mute switch and AF power ampli??? er ON and OFF.

A portion of the demodulated AF signals from the FM IF IC (IC9, pin 9) is applied to the D/A converter (IC12, pin 24) for level (= squelch threshold) adjustment. The level-adjusted AF signals are output from pin 23 and passed through the noise filter (IC9, pins 8, 7, R42, R44???R46, C69, C70, C413). The ??? ltered noise signals are ampli??? ed the noise components only at the noise ampli??? er.

The ampli??? ed noise components are converted into the pulse- type signal at the noise detector section, and output from pin 13 as the ???NOIS??? signal. The converted signal is applied to the CPU (IC22, pin 75). Then the ???RMUTE??? signal from the CPU (IC22, pin 96) to the RX mute switch (Q32) and analog switch (IC3, pins 12, 13) becomes ???Low??? according to the ???NOIS??? signal level to cut off the AF line.

At the same time, the ???AFON??? signal from the CPU (IC22, pin 70) to the AF amplifier controller (Q41, Q42, D21, D23) becomes ???Low??? and the controller turns the AF power ampli??? er (IC15) OFF.

5-1-6-2 TONE SQUELCH

??? CTCSS/DTCS

The tone squelch circuit detects tone signals and opens the squelch only when receiving a signal containing a matched sub audible tone. When the tone squelch is in use, and a signal with a mismatched or no sub audible tone is received, the tone squelch circuit mutes the AF signals even when the noise squelch is open.

A portion of the demodulated AF signals is passed through the active LPF (Q39) to filters CTCSS/DTCS signal. The filtered signal is applied to the CPU (IC22, pin 46). The CPU compares the applied signal and the set CTCSS/DTCS, then the CPU controls the status (???Low??? or ???High???) of ???RMUTE??? and ???AFON??? signals as same as ???NOISE SQUELCH???.

??? DTMF

DTMF signals in the demodulated AF signals are passed through the LPF (IC6, pins 5, 7) to remove unwanted components (voice signals), then applied to the CPU (IC22, pin 45) and decoded.

The level-adjusted MIC signals are output from pin 2, and passed through the MIC mute switch (Q31), HPF (IC5, pins 13, 14) and gain switch (Q34) which controls the gain of MIC amplifier (IC5) according to the Analog/Digital mode, then applied to the MIC amplifier (IC5, pin 9). The amplified MIC signals are output from pin 8, and passed through the analog switch (IC3, pins 4, 3), AF mixer (IC5, pins 6, 7) where the MIC signals and tone signals are mixed with.

??? TONE SIGNALS

The CTCSS/DTCS signals are generated by the CPU (IC22) and output from pins 19???21. The output signals are passed through the 3 resistors (R222???R224) to change its waveform. The waveform changed CTCSS/DTCS signals are passed through the LPF (IC7, pins 10, 8), tone ??? lter switch (Q40) and D/A converter (IC12, pins 12, 11) for level adjustment. The level adjusted CTCSS/DTCS signals are then applied to the AF mixer (IC5, pin 6).

DTMF signals are generated by the CPU (IC22) and output from pin 43. The output DTMF signals are passed through two LPFs (IC6, pins 3, 1 and pins 12, 14), then applied to the AF mixer (IC5, pin 6).

The mixed AF signals are output from pin 7 of the AF mixer (IC5) and passed through the analog switch (IC3, pins 9, 8), then applied to the AF ampli??? er (IC7, pin 6). The ampli??? ed AF signals are output from pin 7, and applied to the D/A converter (IC12, pin 9) to be adjusted its level (= deviation). The level- adjusted MIC signals are then applied to the modulation circuits as the modulation signals.

5-2-2 MODULATION CIRCUITS (MAIN UNIT)

The modulation circuits modulate the VCO oscillating signal using the modulation signals.

The modulation signals from the D/A converter (IC12, pin 10) are applied to the D12 at the TX VCO (Q16, D10, D13, D34) to modulate the VCO oscillating signal by changing the reactance of D12.

The modulation signals are also applied to the reference frequency oscillator (X2) via D/A converter (IC12, pins 16, 15) and the buffer (IC7, pins 12, 14), to ensure the modulation of lower frequency components of the modulation signals.

The modulated VCO output is buffer-amplified by Q15 and Q29, then applied to the transmit amplifiers as the transmit signal via TX/RX switches (D16 is ON, D17 is OFF).

5 - 2

5-2-3 TRANSMIT AMPLIFIERS (PA UNIT)

The transmit signal from the VCO is ampli??? ed to the transmit output level by the transmit ampli??? ers.

The transmit signal from the TX/RX switches (MAIN UNIT; D16 is ON, D17 is OFF) is ampli??? ed by the pre-drive ampli??? er (Q704), drive ampli??? er (Q702) and power ampli??? er (Q701) in sequence to obtain 5 W (approx.) of transmit output power.

The power-amplified transmit signal is passed through the antenna switch (D701), then applied to the antenna via the LPF (ANT UNIT; L801, L802, C802, C803, C807).

5-2-4 APC CIRCUIT (PA UNIT)

The APC (Automatic Power Control) circuit prevents the transition of the transmit output power level which is caused by load mismatching or heat effect, etc.

A portion of transmit signal is detected by the transmit power detectors (D702, D703) to produce DC voltage corresponding to the transmit output power level. The detected voltage is applied to the APC ampli??? er (IC701, pin 3). The transmit power setting voltage ???APC (T1)??? from the D/A converter (MAIN UNIT; IC23, pin 1) is applied to another input terminal (pin 1) as the reference voltage.

The APC amplifier compares the detected voltage and reference voltage, and the difference of the voltage ???APCV??? is output from pin 4. The voltage ???APCV??? controls the bias of the pre-drive (Q704), drive (Q702) and power (Q701) ampli??? ers to reduce/increase the gain of these ampli??? ers for stable transmit output power.

The transmit power muting is carried out by the TX mute switch (MAIN UNIT; Q46), using the ???TMUT??? signal from the CPU (MAIN UNIT; IC22, pin 35).

5-2-5 OVER CURRENT DETECTION CIRCUIT

5 - 3

5-3 PLL CIRCUITS

5-3-1 VOLTAGE CONTROLLED OSCILLATORS

(VCOs; MAIN UNIT)

VCO is an oscillator whose oscillating frequency is controlled by adding voltage (lock voltage).

This transceiver has 2 VCOs RX VCO (Q17, D9, D11, D33) and TX VCO (Q16, D10, D13, D34). The RX VCO oscillates the 1st LO signals, and the TX VCO oscillates the transmit signal.

??? RX VCO

The output signals are ampli??? ed by the buffer ampli??? ers (Q15, Q29), and applied to the 1st mixer (Q6) via TX/RX switches (D16 is OFF, D17 is ON) and LPF (L46, C396, C397), to be mixed with the received signals to produce the 46.35 MHz 1st IF signal.

??? TX VCO

The output signal is applied to the transmit ampli??? ers via the buffer ampli??? ers (Q15, Q29) and TX/RX switches (D16 is ON, D17 is OFF).

A portion of each VCO output is applied to the PLL IC (IC2, pin 8) via the buffer ampli??? er (Q15), doubler (Q14), BPF (D31, D32, L32, C196, C197, C199, C200, C205) and LPF (L34, L36, C202???C204).

??? PLL CIRCUITS

5-3-2 PLL IC (MAIN UNIT)

The PLL circuit provides stable oscillation of the transmit frequency and receive 1st LO frequency. The PLL output frequency is controlled by the divided ratio (N-data) from the CPU.

The VCO output signal from the LPF (L34, L36, C202???C204) is applied to the PLL IC (IC2, pin 8). The applied signal is divided at the prescaler and programmable counter according to the ???SSO??? signal from the CPU (IC22, pin 99). The divided signal is phase-compared with the reference frequency signal from the reference frequency oscillator (X2), at the phase detector.

The phase difference is output from pin 5 as a pulse type signal after being passed through the internal charge pump. The output signal is converted into the DC voltage (lock voltage) by passing through the loop filter (R94???R96, C16, C17, C146). The lock voltage is applied to the varactors (D9 and D33 of RX VCO, D10 and D34 of TX VCO) and locked to keep the VCO frequency constant.

If the oscillated signal drifts, its phase changes from that of the reference frequency, causing a lock voltage change to compensate for the drift in the VCO oscillating frequency.

to the CPU (IC22, pin 34)

5 - 4

SECTION 6 ADJUSTMENT PROCEDURES

6-1 PREPARATION

When adjusting IC-F3020 series, CS-F3020 CLONING SOFTWARE, CS-F3020 ADJ ADJUSTMENT SOFTWARE (Rev. 1.0 or later), OPC-478/U JIG CABLE (modi???ed OPC-478/U CLONING CABLE; see the page 6-2) and the following test equipments are required.

???ADJUSTMENT SOFTWARE INSTALLATION q Quit all applications when Windows is running. w Insert the CD into the appropriate CD drive.

e Double-click the ???Setup.exe??? contained in the ???CS-F3020 ADJ??? folder in the CD drive.

r The ???Welcome to the InstallShield Wizard for CS-F3020 ADJ??? will appear. Click [Next>].

t The ???Choose Destination Location??? will appear. Then click [Next>] to install the software to the destination folder. (e.g. C:\Program Files\Icom\CS-F3020 ADJ)

y After the installation is completed, the ???InstallShield Wiz- ard Complete??? will appear. Then click [Finish].

u Eject the CD.

i Program group ???CS-F3020 ADJ??? appears in the ???Programs??? folder of the start menu, and ???CS-F3020 ADJ??? icon ap- pears on the desk top screen.

???BEFORE STARTING SOFTWARE ADJUSTMENT

Clone the adjustment frequencies and settings into the transceiver, and set the con???guration using the CS-F3020 CLONING SOFTWARE before starting the software adjustment.

Otherwise, the software adjustment can not be started.

CAUTION!: BACK UP the originally programmed memory data in the transceiver before programming the adjustment frequencies. When program the ad- justment frequencies into the transceiver, the transceiver???s memory data will be overwritten and lose original memory data at the same time.

Microsoft and Windows are registered trademarks of Micro- soft Corporation in the U.S.A. and other countries.

??? STARTING SOFTWARE ADJUSTMENT

q Connect the transceiver and PC with OPC-478/U JIG

CABLE.

w Turn the transceiver power ON.

e Boot up Windows, and click the program group ???CS-F3020 ADJ??? in the ???Programs??? folder of the [Start] menu, then CS-F3020 ADJ???s window appears.

r Click ???Connect??? on the CS-F3020 ADJ???s window, then the window shows transceiver???s condition and adjustment items as below.

t Set or modify adjustment data as speci???ed.

??? ADJUSTMENT FREQUENCY LIST

*; [EUR] only

6 - 1

MP37 (C)

MP801 (A)

MP28 (C)

CONNECT Unit

PA Unit

MP28 (C)

J702 (P)

R315 (M)

MP28 (C)

MP13 (C)

J1 (C)

MP35 (C)

MP8 (C)

MP31 (C)

MP1 (C)

ANT Unit

MP17 (C)

MP22 (C) MP34 (C)

MP21 (C)

DS3 (M)

MP9 (M)

MP3 (M)

MP28 (C)

J3 (M)

J2 (M)

MP27 (C)

UNIT abbreviations (C): CHASSIS PARTS, (M): MAIN UNIT, (P): PA UNIT, (CN): CONNECT UNIT, (A): ANT UNIT

8 - 2

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