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SERVICE

MANUAL

1-1-32, Kamiminami, Hirano-ku, Osaka, 547-0003, Japan

S-13813IZ-C1-

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© 2001 Icom Inc.

VHF MARINE TRANSCEIVER

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Summary of Contents for IC-M21

Page 1: ...SERVICE MANUAL VHF MARINE TRANSCEIVER ...

Page 2: ...esses 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 adj...

Page 3: ...TS 4 3 4 5 CPU PORT ALLOCATIONS 4 4 SECTION 5 ADJUSTMENT PROCEDURES 5 1 PREPARATION 5 1 5 2 PLL AND TRANSMITTER ADJUSTMENTS 5 4 5 3 RECEIVER ADJUSTMENT 5 5 SECTION 6 PARTS LIST SECTION 7 MECHANICAL PARTS AND DISASSEMBLY SECTION 8 SEMI CONDUCTOR INFORMATION SECTION 9 BOARD LAYOUTS 9 1 CHARGE UNIT BC 150 9 1 9 2 MAIN UNIT 9 2 9 3 VR UNIT 9 4 SECTION 10 BLOCK DIAGRAM SECTION 11 VOLTAGE DIAGRAM 11 1 M...

Page 4: ...MHz Rx 156 025 MHz 163 275 MHz Rx 156 000 MHz 163 425 MHz 16K0G3E FM BP 224 7 2 V DC 20 C to 60 C 4 F to 140 F 15 C to 55 C 5 F to 131 F 10 ppm 1 5 kHz 1 5 A 1 2 A 0 7 A 0 6 A FRG only 200 mA 20 mA Type STUD 50 Ω 61 W 135H 41 D mm 213 32 W 55 16 H 15 8 D inch with BP 224 360 g 12 7 oz approx Hi power 5 W 5 W 3 W 1 W High Mid Low OTHER Hi power 1 W 1 W 0 5 W High Low FRG Variable reactance frequenc...

Page 5: ...6 075 156 125 156 125 156 175 156 175 156 225 156 225 156 275 156 275 156 325 156 325 156 375 156 425 156 475 Rx only 156 575 156 625 Receive 157 050 161 700 157 100 161 750 157 150 161 800 161 850 161 900 161 950 162 000 160 625 160 675 156 075 160 725 156 125 160 775 156 175 160 825 156 225 160 875 156 275 160 925 156 325 156 375 156 425 156 475 156 525 156 575 156 625 USA 73 74 77 78A 79A 80A 8...

Page 6: ...0 157 150 157 150 157 200 157 250 157 300 157 350 157 400 157 850 156 025 156 075 156 075 156 125 156 175 156 175 156 225 156 225 156 275 156 275 156 325 156 325 156 375 156 425 156 475 Rx only 156 575 156 625 156 675 Receive 161 700 157 100 161 750 157 150 161 800 161 850 161 900 161 950 162 000 157 850 160 625 160 675 156 075 160 725 160 775 156 175 160 825 156 225 160 875 156 275 160 925 156 32...

Page 7: ...M2125F IF amplifier Q151 2SC2714 Y TX RX switch D50 D51 MA77 Antenna switching circuit D90 1SV307 D91 1SS375 1st mixer Q150 3SK272 VCO circuit IF DETECTOR IC IC170 TA31136FN PLL IC IC1 µPD3140GS D A converter IC190 M62363FP 650C CPU IC360 HD6433844RA60H EEPROM IC340 HN58X2416TI Mic amplifier and low pass filter circuits IC200 NJM2902V ...

Page 8: ...w 1 screw A 2 x 10 mm and remove 1 washer B Unscrew 3 screws C 2 x 8 mm Remove the rear panel and rubber from the front panel Unscrew 1 nut D Unscrew 2 screws E 2 x 6 mm Take off the chassis unit in the direction of the arrow Unplug F to separate the front panel J251 and the chassis unit Remove 1 washer G Removing the MAIN unit Unscrew 9 screws H 2 x 4 mm Unsolder 4 points I and remove earth plate...

Page 9: ...he signal is then mixed with a 2nd LO signal for conversion into a 450 kHz 2nd IF signal IC170 contains the 2nd mixer limiter amplifier quadrature detector and active filter circuits A 21 25 MHz 2nd LO signal is produced at the PLL circuit using the reference frequency The 2nd IF signal from the 2nd mixer IC170 pin 3 passes through ceramic filters FI170 to remove unwanted hetero dyned frequencies ...

Page 10: ...d signal at the VCO circuit Q21 Q22 D22 D23 The oscillated signal is amplified at the buffer amplifiers Q23 Q24 4 2 3 DRIVE POWER AMPLIFIER CIRCUITS MAIN UNIT The signal from the VCO circuit passes through the trans mit receive switching circuit D50 D51 and is applied to the buffer amplifier Q50 The amplified signal is amplified by the pre driver Q53 and the power amplifier Q54 to obtain 5 W of RF...

Page 11: ...ia the TX RX switching diode D50 D51 Shift register Prescaler Phase detector Loop filter Programmable counter Programmable divider X1 21 25 MHz 2nd LO signal 21 25 MHz to the FM IF IC IC170 Q21 Q22 D22 D23 VCO Buffer Buffer Buffer Q24 D50 D51 Q25 Q23 3 4 5 PLST IC1 PLL IC SCK SO to transmitter circuit to the 1st mixer circuit 17 16 13 19 LINE HV VCC CPU5V 5V R5V V5V T5V DESCRIPTION The voltage fro...

Page 12: ... Low While H L key is pushed Input port for the SQL key Low While SQL key is pushed Input port for the Y key Low While Y key is pushed Pin number 54 55 56 57 58 83 84 85 86 88 91 93 94 95 Port name DOWN 16CH CHWX SCAN DW 5VS MICM DETM WET WXTV BATTV TEMPV RSSIV PTT Description Input port for the Z key Low While Z key is pushed Input port for the 16 key Low While 16 key is pushed Input port for the...

Page 13: ...ND RANGE Output voltage 7 5 V DC Current capacity 3 A or more Measuring range 0 1 10 W Frequency range 100 300 MHz Impedance 50 Ω SWR Less than 1 2 1 Frequency range 0 1 300 MHz Frequency accuracy 1 ppm or better Sensitivity 100 mV or better Input impedance 10 MΩ DC or better EQUIPMENT FM deviation meter Audio generator Standard signal generator SSG Attenuator GRADE AND RANGE Frequency range 30 30...

Page 14: ...ck SINAD meter Speaker 8 OPC 782 Optional plug adapter cable DETACHING ATTACHING THE TOP PANEL Detach the TOP PANEL with a sharp point such as tweezers for adjustment BE CAREFUL cracking the TOP PANEL NOTE If the tape on the back of the TOP PANEL has lost its adhesion replacement to a new one is necessary After adjustment be sure to reattach the TOP PANEL to maintain the water resistance capabilit...

Page 15: ... ch16 Set an SSG as Frequency 156 8 MHz ch 16 Level 3 2 µV 97 dBm Modulation 1 kHz Deviation 3 5 kHz Receiving MAIN Top Panel Connect a digital multi meter or oscil loscope to the check point CP1 Connect an SSG to the antenna con nector and a SINAD meter with 8 Ω load to the SP jack 1 8 V 1 7 V 0 35 µV 116 dBm M2A 0 56 µV 112 dBm M21 Verify Verify CP1 PLL lock voltage check point The output level ...

Page 16: ...UENCY Fr OUTPUT POWER Po H Hi Po M Mid Po L Low Po ML Extra Low FM DEVIATION dE SQUELCH LEVEL nL S METER SL Top Panel Top panel Top panel Top panel Top panel Loosely couple the frequency counter to the antenna connec tor Connect an RF power meter to the antenna connector Connect an FM deviation meter to the antenna connector through an attenuator Connect an SSG to the antenna connector and a SINAD...

Page 17: ...LJRE R10G F L49 6200005740 S COIL ELJRE 47NG F L50 6200006980 S COIL ELJRE R10G F L51 6200007000 S COIL ELJRE 82NG F L52 6200010230 S COIL EXCCL3216U1 L53 6200002330 S COIL LQN 1A 15NJ04 L54 6200010230 S COIL EXCCL3216U1 L55 6200009240 S COIL 0 20 1 0 7TL 31N L56 6200008530 S COIL 0 30 1 0 4TL 12N L57 6200008400 S COIL 0 35 1 6 6TL 36N L58 6200003710 S COIL NL 252018T 2R7J L80 6200008450 S COIL 0 ...

Page 18: ... RESISTOR ERJ3GEYJ 151 V 150 Ω R241 7030003430 S RESISTOR ERJ3GEYJ 821 V 820 Ω R242 7030003430 S RESISTOR ERJ3GEYJ 821 V 820 Ω REF ORDER DESCRIPTION NO NO MAIN UNIT R245 7030003440 S RESISTOR ERJ3GEYJ 102 V 1 kΩ R250 7030003680 S RESISTOR ERJ3GEYJ 104 V 100 kΩ R251 7030003400 S RESISTOR ERJ3GEYJ 471 V 470 Ω R252 7030003620 S RESISTOR ERJ3GEYJ 333 V 33 kΩ R253 7030003480 S RESISTOR ERJ3GEYJ 222 V 2...

Page 19: ...T A C109 4030006850 S CERAMIC C1608 JB 1H 471K T A 6 3 REF ORDER DESCRIPTION NO NO MAIN UNIT C110 4030006860 S CERAMIC C1608 JB 1H 102K T A C115 4030006860 S CERAMIC C1608 JB 1H 102K T A M21 only C120 4030006900 S CERAMIC C1608 JB 1H 103K T A C121 4030006860 S CERAMIC C1608 JB 1H 102K T A C122 4030007030 S CERAMIC C1608 CH 1H 150J T A C123 4030007010 S CERAMIC C1608 CH 1H 100D T A C130 4030009920 ...

Page 20: ...CERAMIC C1608 JB 1H 333K T A C368 4030008920 S CERAMIC C1608 JB 1H 473K T A C370 4030007040 S CERAMIC C1608 CH 1H 180J T A C371 4030007050 S CERAMIC C1608 CH 1H 220J T A C372 4030011600 S CERAMIC C1608 JB 1E 104K T N C373 4030011600 S CERAMIC C1608 JB 1E 104K T N C374 4030011600 S CERAMIC C1608 JB 1E 104K T N C375 4030011600 S CERAMIC C1608 JB 1E 104K T N C376 4030011600 S CERAMIC C1608 JB 1E 104K...

Page 21: ...0056890 2497 A terminal 1 MP35 8930056900 2497 B terminal 1 MP36 8810008640 Screw B0 2 x 4 NI ZU BT 2 MP37 8930056910 2497 C terminal 1 MP38 8810009510 Screw B0 2 x 4 NI ZU BT 1 MP39 8810009510 Screw B0 2 x 4 NI ZU BT 8 MP40 8930057720 2497 earth plate M2A 1 8930058050 2497 A earth plate M21 1 MP41 8810009510 Screw B0 2 x 4 NI ZU BT 1 MP42 8810009560 Screw B0 2 x 6 ZK BT 2 MP43 8510014580 2497 Mai...

Page 22: ...C CHASSIS PARTS M MAIN UNIT V VR UNIT NOTE1 Once the following parts are removed a O ring or sealing must be replaced with new one before reattachement Mother part Daughter part for relayted replacement J31 C Antenna connector MP14 C Sealing washer VR unit MP10 C O ring MP24 C Screw MP25 C Sealing washer NOTE2 The glue must be applied to the areas when the front panel is replaced with new one to e...

Page 23: ...4 8930047830 Leg cushion C 2 CHASSIS REF NO ORDER NO DESCRIPTION R1 7070001130 RESISTOR 120 ERG2SJ R2 7070001140 RESISTOR 150 ERG2SJ R3 7010007100 RESISTOR 1K PSD1 4V J1 6510023070 CONNECTOR HEC2305 01 250 DS1 5040001390 LED TLG124A EP1 0910054642 PCB B 5787B CHARGE UNIT MECHANICAL PARTS Screw abbreviations A0 B0 BT Self tapping NI ZU Nickel zinc SUS Stainless 16 4V No load 13 0V Charge 16 4V No l...

Page 24: ...L XP6401 Symbol 5O G S D S D G top view S B E C B E C B E C E1 B1 B2 C1 C2 G1 G2 S D 2SA1588 GR Symbol ZG 2SB1132 Q Symbol BAQ 2SC2714 Y Symbol QY 2SC4081 R Symbol BR 2SC4213 B Symbol AB B E C B C E B E C B E C B E C B E C E1 B2 E2 C1 C2 B1 B E C E1 E2 B2 C1 B1 C2 TRANSISTOR AND FETS DIODES MA77 Symbol 4B 1SV307 Symbol TX HVU350 B Symbol 4 MA2S077 Symbol S 1SS375 Symbol FH MA728 Symbol 2A DA204 U ...

Page 25: ...SECTION 9 BOARD LAYOUTS 9 1 CHARGE UNIT BC 150 TOP VIEW BOTTOM VIEW 9 1 DS1 R3 J1 R2 R1 B5787B MP2 MP1 ...

Page 26: ... DS241 C48 C44 C49 R56 C51 R55 CP353 Q50 L50 C55 R71 L49 C52 R54 L52 R120 C122 L120 D50 R221 C221 R223 R224 Q222 IC50 R66 C56 C60 R68 C58 R67 R59 C57 R58 R62 Q52 R231 R230 R225 R282 C233 CP250 R235 IC280 C287 C232 R234 R232 C240 CP252 CP251 R245 CP253 CP245 CP254 J251 CP240 Q280 C280 R233 R76 D80 L82 C88 C222 C120 C63 R72 L53 Q53 R52 R36 R57 C53 L51 C54 R69 R70 C64 R73 R74 R75 C65 C66 C50 R53 L56 ...

Page 27: ...1 R345 R303 R307 R315 B5714E IC360 R341 CP350 C3 R2 C350 C170 C251 S250 C289 C288 C229 C98 R90 C97 L91 C95 L94 D91 CP80 R115 R80 D90 L81 C91 C90 C104 D93 R95 C136 C101 R132 C135 C130 C110 C131 R130 L130 D130 C154 C220 R176 C180 C181 R172 C175 R260 R261 R194 C207 R214 R213 C12 R212 C206 R274 R251 R240 R275 Q250 C266 C265 R278 IC200 C376 R375 C254 IC260 R263 IC190 C193 R193 C360 C340 R3 C2 R4 R1 C4 ...

Page 28: ...9 4 9 3 VR UNIT TOP VIEW R500 B5715A to the MAIN unit J240 VCC VCC NC VOLIN VOLO GND BOTTOM VIEW ...

Page 29: ...60 TC4W66F ANALOG SW LPF IC200C NJM2902V BEPO AF MUTE SW DE ENPHA MIC AMP IC200B NJM2902V R286 10 k C285 0 1 AFVS Q280 2SC4213 B IVOLM AF AMP AF REG PRE ENPHA R253 2 2 k C254 0 01 Q230 2SB1132 Q Q231 XP6501 AB HV IC280 TA7368F PTT CONT Q250 UN911H PTT GND MIC CLONE AFOUT SPO J250 EXP JACK MIC PTT SP VCC HV POWER VCC VR VR VOLO GND VOLIN GND BTYPE REF X1 CR 726 D1 HVU17 21 25 MHz FCON L C D IC360 H...

Page 30: ... 4 7 k CP250 C252 0 001 R252 33 k UP S320 S323 CHWX SQL SCAN DOWN 16CH S321 S322 S324 S325 S326 DW HL S327 R201 15 k R203 1 2 M R207 27 k C202 0 1 R206 18 k R377 82 k R378 82 k R379 82 k A0 A1 A2 VSS 8 7 6 5 VCC WP SCL SDA 1 2 3 4 OUT VDD VSS CD NC 1 2 3 5 4 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54...

Page 31: ...0 P C7 0 01 C8 2 P C9 2 P C12 0 001 C5 12 P R6 1 k C6 0 001 R20 100 C20 0 001 C21 9 P C10 0 047 X170 CDBCB450KCAY24 C174 0 001 R171 1 2 k C160 0 0056 R155 1 5 k R156 470 C155 6 P R154 100 k C158 0 001 C157 0 022 C153 0 001 C152 0 022 R151 3 3 k C154 0 001 C150 0 001 R150 100 C143 0 001 R134 68 R133 10 k C141 5 P C139 33 P L132 80 nH C136 0 001 R132 10 k C220 22 C221 0 01 C222 0 01 C223 0 01 T5VS 5...

Page 32: ...S242 SML 311YTT86 DS243 SML 311YTT86 BATTV LEDL LEDK AFVS 6 5 4 1 2 3 R60 1 k R61 0 15 R62 100 k R63 10 k C61 33 C62 0 001 C63 470 P C67 470 P L55 31 nH MP50 R75 100 R71 100 C70 91 P C71 27 P C81 15 P C83 22 P C85 27 P CP80 R82 3 9 k C88 0 001 C68 47 P C73 0 001 R76 150 R72 47 L53 15 nH R59 15 k R64 10 k C59 0 001 C60 0 001 R70 15 k R73 1 k R74 10 k C66 0 001 C64 0 001 R54 33 R58 1 k 6 5 4 1 2 3 C...

Page 33: ... k ATIS8 ATIS7 ATIS6 ATIS5 ATIS4 ATIS3 ATIS2 ATIS1 R302 20 k DETM DETM MICM AFOUT R304 20 k SPO SPO J251 BM02B ASRS TF 1 2 GND R306 20 k R308 20 k D350 DA204U Q350 DTC144TU R353 1 k CPU5V R351 1 k R310 20 k R312 20 k R314 20 k MICM DETIN DETO DET R253 2 2 k 5V IC200 NJM2902V 1 2 3 4 5 6 7 14 13 12 11 10 9 8 8 7 6 5 1 2 3 4 5V DETM MICO MICIN R255 150 k R271 56 k R272 120 k C265 150 P R273 22 k R27...

Page 34: ...11 2 11 2 VR UNIT CP506 1 2 3 4 5 6 CP505 CP504 CP503 CP502 CP501 CP500 GND VOLO VOLIN NC VCC VCC R500 B 5715A VCC HV From BATTERY ...

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