Icom IC-F21S - Manuals

Icom IC-F21S – Manual in PDF format online.

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Manual

Manual Icom IC-F21S

Summary

Page 2 - DO NOT expose the transceiver to rain, snow or any liquids.; using such test equipment.

INTRODUCTION DANGER ORDERING PARTS REPAIR NOTES This service manual describes the latest service informationfor the IC-F21/IC-F21S at the time of publication. NEVER connect the transceiver to an AC outlet or to a DCpower supply that uses more than 16 V. Such a connectioncould cause a fire hazard and...

Page 3 - TABLE OF CONTENTS

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 . . . . . . ....

Page 4 - GENERAL

1 - 1 SECTION 1 SPECIFICATIONS ‘ ‘ GENERAL • Frequency coverage : 440.000–470.000 MHz • Type of emission : 16K0F3E (at 25 kHz), 8K50F3E (at 12.5 kHz) • Number of channels : 2 ch (IC-F21S), 16 ch (IC-F21) • Power supply requirement : 7.2 V DC (negative ground) • Current drain (approx.) : Transmit at ...

Page 5 - • MAIN UNIT; TOP VIEW

2 - 1 SECTION 2 INSIDE VIEWS • MAIN UNIT Power amplifier (Q1: 2SK2974) Antenna switching circuit D1: 1SV307 D9, D10: MA77 TOP VIEW BOTTOM VIEW RF amplifier(Q15: 3SK293) VCO circuit FM IF IC(IC3: TA31136FN) Low-pass filter circuit (IC12,16: NJM12904V) Expander IC (IC15: BU4094BCFV) TX/RX switch (D3, ...

Page 6 - • REMOVING THE CHASSIS; , to separate the Jack panel and the; • REMOVING THE MAIN UNIT; Remove the sealing rubber.

3 - 1 SECTION 3 DISASSEMBLY INSTRUCTIONS • REMOVING THE CHASSIS ¡ Unscrew 1 nut, A , and remove 2 knobs, B , C . ™ Unscrew 2 screws, D . £ Unscrew 2 screws, H , to separate the Jack panel and the Front panel. ¢ Take off the chassis in the direction of the arrow. ∞ Unplug J6 to separate the front pan...

Page 7 - -1 RECEIVER CIRCUITS; type diode switching system.; ND IF AND DEMODULATOR CIRCUITS

4 - 1 SECTION 4 CIRCUIT DESCRIPTION 4-1 RECEIVER CIRCUITS 4-1-1 ANTENNA SWITCHING CIRCUIT The antenna switching circuit functions as a low-pass filterwhile receiving. However, its impedance becomes very highwhile D9 and D10 are turned ON. Thus transmit signals areblocked from entering the receiver c...

Page 8 - -2 TRANSMITTER CIRCUITS; APC CIRCUIT

4 - 2 The applied AF signals are amplified at the AF power ampli-fier circuit (IC4, pin 4) to obtain the specified audio level. Theamplified AF signals output from pin 10 as “AFOUT”signalare applied to the internal speaker (SP1) as the “SP” signalvia the [SP] jack when no plug is connected to the ja...

Page 9 - PLL CIRCUIT

4 - 3 4-3 PLL CIRCUIT 4-3-1 GENERAL A PLL circuit provides stable oscillation of the transmit fre-quency and receive 1st LO frequency. The PLL output com-pares the phase of the divided VCO frequency to the refer-ence frequency. The PLL output frequency is controlled by acrystal oscillator and the di...

Page 10 - -4 POWER SUPPLY CIRCUITS; VOLTAGE LINE

4 - 4 4-4 POWER SUPPLY CIRCUITS VOLTAGE LINE LINE HV VCC CPU5V T5V R5V S5V +5V VCO5V DESCRIPTION The voltage from the attached battery pack. The same voltage as the HV line (battery volt-age) which is controlled by the power swtich([VOL] control). Common 5 V converted from the VCC line by the+5 regu...

Page 12 - REQUIRED TEST EQUIPMENT; SECTION 5 ADJUSTMENT PROCEDURES; SYSTEM REQUIREMENTS; • IBM PC compatible computer with an RS -232C serial port; ADJUSTMENT SOFTWARE INSTALLATION; - Quit all applications when Windows is running.; STARTING SOFTWARE ADJUSTMENT; Boot up Windows, and turn the transceiver power ON.

5-1 PREPARATION When you adjust the contents on page 5-5 or 5-6, SOFTWARE ADJUSTMENT, the optional CS-F21 ADJ ADJUSTMENT SOFTWARE (Rev. 1.0 or later), OPC-478 CLONING CABLE and a JIG CABLE (see illustration at page 5-2) are required. ■ REQUIRED TEST EQUIPMENT 5 - 1 SECTION 5 ADJUSTMENT PROCEDURES EQ...

Page 13 - JIG cable; Screen display exampe

5 - 2 JIG cable + ( CLONE) ( GND) + ( SP) ( SPE) 3-conductor 3.5(d) mm plug OPC-478 JIG cable to IC-F4GT/GS [SP] jack CS-F21 ADJ Rev.1.0 File COM 1: OPEN Option Connect Reload (F5) Disp para [A / D]VIN : 197 : C5h : 7.73 V TEMPS : 190 : BEh : 32.23 ’C LVIN : 98 : 62h : 1.92 V SD : 0 : 00h : 0.00 V R...

Page 14 - Connection; DC power cable connections

5 - 3 to an RS-232C port Personalcomputer to [MIC] to [SP] JIG cable DB9 female plug (incl. level converter circuit) Connection to the antenna connector RF power meter 0.1—10 W/50 ‰ Frequency counter Attenuator 40 dB or 50 dB FM deviation meter Standard signal generator 0.1 V to 32 mV (—127 dBm to —...

Page 16 - -3 SOFTWARE ADJUSTMENT

5 - 5 1 1 2 3 1 2 1 • Operating frequency: 470.000 MHz • High/Low switch : Low • Connect the RF power meter or 50 Ω dummy load to the antenna connector. • Transmitting • Operating frequency: 440.000 MHz • High/Low switch : High • Transmitting • High/Low switch : Low2 • Transmitting • High/Low switch...

Page 17 - SOFTWARE ADJUSTMENT – continued

5 - 6 Minimum distortion level 12 dB SINAD At the point where the audio signals just appears. 1 • Operating frequency: 440.000 MHz • Channel spacing :Narrow • Connect a standard signal generator to the antenna connector and set as: Frequency : 440.000 MHz Level : 10 µV* (–87 dBm) Modulation : OFF De...

Page 18 - SECTION 6 PARTS LIST

6 - 1 S.=Surface mount Q1 1590003020 S.TRANSISTOR XP4216-(TX) R1 7210003060 VARIABLE TP76N00N-15F-10KA-2251 R2 7030003380 S.RESISTOR ERJ3GEYJ 331 V (330 Ω ) R3 7030003410 S.RESISTOR ERJ3GEYJ 561 V (560 Ω ) F1 5210000710 S.FUSE KAB 2402 322 NA29 DS1 5040002070 S.LED LNJ107W5PRW S1 2250000430 ENCODER ...

Page 23 - Screw abbreviations

SECTION 7 MECHANICAL PARTS AND DISASSEMBLY 7 - 1 REF. NO. ODER NO. DESCRIPTION QTY. SP1 2510001100 Speaker 036D0601 1 MP1 8210017710 2458 front panel 1 MP4 8930054680 2458 release button 1 MP6 8930054690 2458 lens 1 MP7 8210017730 2458 jack panel 1 MP8 8930054881 2458 plus terminal-1 1 MP9 801001850...

Page 25 - TRANSISTOR AND FET’S

SECTION 8 SEMI-CONDUCTOR INFORMATION 8 - 1 2SC5085 Y(Symbol: MCY) 2SK1829(Symbol: K1) 2SC5107 O(Symbol: MFO) 2SK880 Y(Symbol: XY) 2SK2974(Symbol: K2974) 2SC4116 GR(Symbol: LG) 2SA1577 Q(Symbol: HQ) 2SB1132 R(Symbol: BARB) 3SK272(Symbol: K) 2SC4215 O(Symbol: QO) 2SK2973(Symbol: K1) DTC144 TU(Symbol: ...

Page 26 - • TOP VIEW

SECTION 9 BOARD LAYOUTS 9 - 1 9-1 MAIN UNIT • TOP VIEW C196 C194 R159 R222 R223 R224 R122 R151 C223 R143 EP7 R145 R146 R187 R195 R188 R193 R190 C226 C242 C243 R215 R224 R225 R226 C245 C246 R155 C191 C258 C225 C224 R191 R189 R194 R245 C58 R163 C43 L11 X3 R50 R22 R31 R23 R24 R51 R164 C84 C85 C252 D6 R...

Page 27 - • BOTTOM VIEW

9 - 2 • BOTTOM VIEW R133 R130 R227 R229 R63 D12 C100 C99 D9 L19 D1 C106 D10 MP5 C98 R60 R61 R59 C96 C7 L4 C165 R103 C118 R73 L1 C257 C114 C115 R71 R125 C119 R75 C121 R127 R118 IC2 Q21 IC9 Q16 R84 R86 R83 C129 C138 C123 R76 L26 C127 C128 C137 R89 C136 C126 C202 R93 R119 C178 C176 R165 R100 C203 C186 ...

Page 30 - BC-146 OPTIONAL DESKTOP CHARGER INFORMATION; 0-2 DISASSEMBLY INFORMATION

10 - 1 SECTION 10 BC-146 OPTIONAL DESKTOP CHARGER INFORMATION REF. NO. ODER NO. DESCRIPTION QTY. MP1 8010018620 2447 case (A) 1 MP2 8110007450 2447 cover 1 MP3 8930039620 Leg cushion (A) 4 MP4 8930055020 2480 spacer 1 MP5 8930055030 2480 BC-spacer 1 MP6 8810008660 Screw B0 M 3 x 8 NI-ZU (BT) 1 [CHAS...

Page 32 - BLOCK DIAGRAM

11 - 1 SECTION 11 BLOCK DIAGRAM ANT440–470MHz Q1 2SK2974 D1 1SV307D9,D10 MA77 D2RB706F-40 Q22SK2973 Q32SC3585 Q42SC5107 VCOSW D3,D4MA77 Q72SC5107 Q52SC5107 Q8 DTC144EUQ9 XP1214 R5V S5V RX VCO Q12XP6501 Q10 2SC5085D5 HVU350 Q11 2SC5085D7 HVU350 LVIN BUFF Q132SK880 IC1MB15A02PFV1 X1CR-671A REF BAL DEV...

Page 33 - VOLTAGE DIAGRAM

R47 47 EP3 VCC CBI0CBI1CBI2CBI3 RLED TLED CBI0 C1560.001 C1570.001 C1580.001 C1590.001 W12 W13 EP7 VOLIN VOLOUT C9347 P C9447 P F1 F2 C840.001 R5147 k D19HVC362 C852.2 R5056 REF BAL R521k C920.1 D20MA2S111 R232150 k OSCIN OSCOUT VP VCC DO GND LD FIN CLOCK 9 DATA 10 LE 11 FC 12 NC 13 FOUT 14 P 15 R 1...

Page 36 - CHASSIS UNIT; CH VERSION

12 - 2 12-2 SW-A AND SW-B UNITS • SW-A UNIT TP76N00N-15F-10KA-2251R1 Q1 XP4216 R3 560 R2 330 DS1LNJ107W5PRW C 1 1 2 2 3 4 4 8 5 S1 CP10 CP11 CP12 CBI0 CBI1 CP13 CBI2 CBI3 CP8 HV F1 654 3 2 1 CP3 CP4CP5 CP6 CP2 CP9 CBI0 VOLIN VOLOUT VCC RLED TLED GND CP1 G R RX (SQL OPEN) 4.1 V RX (SQL OPEN) 0 V RX (...

Page 38 - VHF FM TRANSCEIVERS