Icom IC-A110, Service Manual

Page 1: ...SERVICE MANUAL VHF AIR BAND TRANSCEIVER iA110 ...

Page 2: ... than 16 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 REPAIR NOTES 1 Make sure a problem is internal before disassembling the transceiver 2 DO NOT ...

Page 3: ...PORT ALLOCATIONS 3 5 SECTION 4 ADJUSTMENT PROCEDURES 4 1 PREPARATION 4 1 4 2 PLL ADJUSTMENT 4 3 4 3 TRANSMITTER ADJUSTMENT 4 3 4 4 RECEIVER ADJUSTMENT 4 5 SECTION 5 PARTS LIST SECTION 6 MECHANICAL PARTS AND DISSASEMBLY SECTION 7 SEMI CONDUCTOR INFORMATION SECTION 8 BOARD LAYOUTS 8 1 FRONT UNIT 8 1 8 2 MAIN UNIT 8 3 SECTION 9 BLOCK DIAGRAM SECTION 10 VOLTAGE DIAGRAM 10 1 FRONT UNIT 10 1 10 2 MAIN U...

Page 4: ...io More than 40 dB Spurious emissions 16 dBm or less except 62 5 kHz of operating frequency Antenna requirements Standard 50 Ω antenna with a VSWR 3 1 RECEIVER Receive system Double conversion superheterodyne system Intermediate frequencies 1st 38 85 MHz 2nd 450 kHz Sensitivity Less than 1 µV at 6 dB S N Squelch sensitivity Less than 0 35 µV at threshold Selectivity Spurious response rejection rat...

Page 5: ...lifier Q11 2SC4081 Crystal band pass filter FI2 FL 307 USA 1 only Power complifier Q51 MRF137 TCXO X1 CR 653 2 1 SECTION 2 INSIDE VIEWS MAIN UNIT TOP VIEW AF amplifier IC37 TDA7233D RX 1st mixer Q2 3SK184 2nd IF IC IC40 TA31136FN PLL IC IC2 TB31207AFN PWM modulator IC44 µPC311 EEPROM IC4 BA3308F Low pass filter Antenna switching circuit AF power amplifier Q92 93 2SK2414 BOTTOM VIEW ...

Page 6: ... 1st mixer circuit converts the received signal into a fixed frequency of the 1st IF signal with a PLL output frequency By changing the PLL frequency only the desired frequency will pass through a crystal filter at the next stage of the 1st mixer The filtered signals from the RF circuit are mixed at the 1st mixer Q2 with a 1st LO signal coming from the VCO circuit to produce a 38 85 MHz 1st IF sig...

Page 7: ...odulation is included in the signal the squelch circuit cuts out the AF signal by com paring voice audio and noise audio components in the AF detected signals The 2nd IF signal from the IF IC MAIN unit IC40 pin 3 passes through the 450 kHz ceramic filter Wide mode FI3 Narrow mode FI4 to remove out of band signals and then applied to the IF amplifier A portion of the amplified 2nd IF signal from th...

Page 8: ...3 C468 and then applied to the drain of power ampli fier Q51 for the last stage modulation 3 2 3 DRIVE POWER AMPLIFIER CIRCUITS MAIN UNIT The amplifier circuit amplifies the VCO oscillating signal to the output power level The signal from the buffer amplifiers Q14 Q15 is passed through the TX RX switch D11 and is amplified at the pre amplifier Q42 pre drivers Q20 Q21 and the power amplifier Q51 to...

Page 9: ... RX LOOP The generated signal at the RX VCO Q59 D65 enters the PLL IC IC2 pin 8 and is divided at the programmable divider section The divided signal is then applied to the phase detector section The phase detector compares the input signal with a refer ence frequency and then outputs the out of phase signal pulse type signal from pin 9 The pulse type signal is converted into DC voltage lock volta...

Page 10: ...ted by the 8 V regulator circuit IC29 8 V for receiver circuits regulated by the 8 V regulator circuit IC29 3 5 PORT ALLOCATIONS 3 5 1 OUTPUT EXPANDER IC FRONT unit IC5 Pin number 4 5 6 7 11 12 13 14 Port name LED1 LED2 TRC R T SMUT AFMUT RMUT TMUT Description Outputs backlight control signals Outputs control signal to the MOD AF swtich MAIN unit IC48 pin 5 and etc High While transmitting Outputs ...

Page 11: ...OM FRONT unit IC4 pin 2 Outputs serial data to the PLL IC MAIN unit IC2 pin 4 the expander IC FRONT unit IC5 pin 2 and the electric volume MAIN unit IC13 pin 9 Outputs strobe signals to the PLL IC MAIN unit IC2 pin 5 Outputs 2nd IF filter s select signal High While wide is selected Input port for the unlock signal from the PLL IC MAIN unit IC2 pin 11 Low PLL is unlocked Input port for the cloning ...

Page 12: ...tmeter Digital multimeter Audio generator Standard signal generator SSG AC millivoltmeter Attenuator Terminator GRADE AND RANGE Input impedance 50 kΩ V DC or better Input impedance 10 MΩ V DC or better Frequency range 300 3000 Hz Measuring range 1 500 mV Frequency range 0 1 300 MHz Output level 0 1 µV 32 mV 127 to 17 dBm Measuring range 10 mV 10 V Power attenuation 40 or 50 dB Capacity 50 W or mor...

Page 13: ...Hz AC millivoltmeter Modulation analyzer Attenuator 40 dB or 50 dB Power supply DC 13 75 V 10 A Distortion meter AC millivoltmeter CAUTION DO NOT transmit while an SSG is connected to the antenna connector Frequency counter Personal computer OPC 592 to an RS 232C port OPC 478 DB9 female plug incl level converter circuit CONNECTION 1 2 3 4 5 6 7 8 Audio generator Pin 4 PTT MIC JACK PIN CONNECTION P...

Page 14: ...X1 4 3 TRANSMITTER ADJUSTMENT OUTPUT POWER MODULATION DEPTH HEAD SET MODULATION ADJUSTMENT ADJUSTMENT ADJUSTMENT CONDITION MEASUREMENT VALUE POINT UNIT LOCATION UNIT ADJUST 1 1 2 1 Operating frequency 127 000 MHz No audio applied to the MIC jack Transmitting Operating frequecy 127 000 MHz Connect an audio generator to the MIC jack and set as 1 kHz 10 mVrms Set a modulation analyzer as HPF OFF LPF ...

Page 15: ...age check point R59 TUNE voltage adjustment L40 PLL lock voltage adjustment for TX L41 PLL lock voltage adjustment for RX X1 Reference frequency adjustment CP2 PLL lock voltage check point R121 R110 Modulation depth adjustment R150 Output power adjustment J6 pin 3 Audio input point Audio generator pin 5 PTT pin 3 MIC pin 4 GND pin 2 MICE ...

Page 16: ... Level 0 18 µV 122 dBm Modulation OFF Receiving Set an SSG as Level 5 6 µV 92 dBm Modulation OFF Rear panel Front panel Connect an AC milli voltmeter and dis tortion meter with 8 Ω load to the exter nal SP jack Display Maximum AF output level Maximum AF output level MAIN This output level of the standard signal generator SSG is indicated as SSG s open circuit L9 L10 L11 L49 R59 Verify the display ...

Page 17: ...4 6 DC power supply 13 75 V 10 A L9 R59 L49 L10 L11 RX sensitivity adjustment ...

Page 18: ...10 S RESISTOR ERJ3GEYJ 273 V 27 kΩ R43 7030003580 S RESISTOR ERJ3GEYJ 153 V 15 kΩ R44 7030003580 S RESISTOR ERJ3GEYJ 153 V 15 kΩ R45 7030003580 S RESISTOR ERJ3GEYJ 153 V 15 kΩ R46 7030003610 S RESISTOR ERJ3GEYJ 273 V 27 kΩ R47 7030003580 S RESISTOR ERJ3GEYJ 153 V 15 kΩ C1 4030006860 S CERAMIC C1608 JB 1H 102K T A C2 4030006860 S CERAMIC C1608 JB 1H 102K T A C3 4030007090 S CERAMIC C1608 CH 1H 470J...

Page 19: ...STOR XP4315 TX Q87 1560001120 S FET 2SK2414 Z E1 Q88 1560001120 S FET 2SK2414 Z E1 Q89 1590001170 S TRANSISTOR XP1501 TX AB Q90 1510001020 TRANSISTOR 2SA1471R Q91 1560001120 S FET 2SK2414 Z E1 Q92 1560001120 S FET 2SK2414 Z E1 Q93 1560001120 S FET 2SK2414 Z E1 Q94 1590002870 S FET FW215 TL Q96 1590000430 S TRANSISTOR DTC144EUA T106 Q97 1590000430 S TRANSISTOR DTC144EUA T106 Q98 1510000770 S TRANSI...

Page 20: ...00 S RESISTOR ERJ3GEYJ 154 V 150 kΩ R70 7030003400 S RESISTOR ERJ3GEYJ 471 V 470 Ω R71 7030003280 S RESISTOR ERJ3GEYJ 470 V 47 Ω R72 7030003660 S RESISTOR ERJ3GEYJ 683 V 68 kΩ R73 7030003370 S RESISTOR ERJ3GEYJ 271 V 270 Ω R74 7030003630 S RESISTOR ERJ3GEYJ 393 V 39 kΩ R75 7030003340 S RESISTOR ERJ3GEYJ 151 V 150 Ω R76 7030003560 S RESISTOR ERJ3GEYJ 103 V 10 kΩ R77 7030003560 S RESISTOR ERJ3GEYJ 1...

Page 21: ...EYJ 222 V 2 2 kΩ R403 7030003480 S RESISTOR ERJ3GEYJ 222 V 2 2 kΩ R404 7030003480 S RESISTOR ERJ3GEYJ 222 V 2 2 kΩ R405 7030003650 S RESISTOR ERJ3GEYJ 563 V 56 kΩ R406 7030003470 S RESISTOR ERJ3GEYJ 182 V 1 8 kΩ R407 7030003700 S RESISTOR ERJ3GEYJ 154 V 150 kΩ R408 7030003700 S RESISTOR ERJ3GEYJ 154 V 150 kΩ R409 7030004890 S RESISTOR ERJ3GEYF 434 V 430 kΩ R410 7030004860 S RESISTOR ERJ3GEYF 184 V...

Page 22: ...ERAMIC C1608 JB 1E 103K T A C117 4030009970 S CERAMIC C1608 JB 1H 182K T A C118 4030009630 S CERAMIC C1608 JB 1H 822K T A C119 4030007130 S CERAMIC C1608 CH 1H 101J T A C120 4030012610 S CERAMIC C2012 JB 1C 474K T A C121 4030006900 S CERAMIC C1608 JB 1E 103K T A C122 4030006860 S CERAMIC C1608 JB 1H 102K T A C123 4550006220 S TANTALUM TEMSVA 0J 156M 8L C124 4030006860 S CERAMIC C1608 JB 1H 102K T ...

Page 23: ... C403 4030012600 S CERAMIC C2012 JB 1A 105M T A C404 4030012610 S CERAMIC C2012 JB 1C 474K T A C405 4030009350 S CERAMIC C1608 CH 1H 3R5B T A C406 4030006960 S CERAMIC C1608 CH 1H 050C T A C407 4030009530 S CERAMIC C1608 CH 1H 030B T A C409 4030006860 S CERAMIC C1608 JB 1H 102K T A C410 4030006860 S CERAMIC C1608 JB 1H 102K T A C413 4550006160 S TANTALUM ECST1CY155R C415 4030007060 S CERAMIC C1608...

Page 24: ...09400 CONNECTOR B7B ZR J7 6450000140 CONNECTOR HSJ0807 01 010 T1 5920000750 TRANSFORMER ST 82 P W1 8900009210 CABLE OPC 905 W2 7120000470 JUMPER ERDS2T0 W3 7120000470 JUMPER ERDS2T0 W4 7120000470 JUMPER ERDS2T0 W15 7030003860 S JUMPER ERJ3GE JPW V W25 7030003860 S JUMPER ERJ3GE JPW V GEN 1 only W27 7030003860 S JUMPER ERJ3GE JPW V W28 7030003860 S JUMPER ERJ3GE JPW V GEN 1 only W29 7030007150 S JU...

Page 25: ... No seal BE A110 GEN 1 Serial No seal BE A110 FCC USA 1 1 MP18 8930051830 2270 B sheet 1 MP19 8930051820 2270 A sponge 1 ACCESSORIES REF NO ORDER NO DESCRIPTION QTY F1 5210000070 Fuse FGB 10A 2 W1 Optional product DC power cable OPC 344 1 W2 8900000730 Microphone HANG cable OPC 049 1 MC1 Optional product Microphone HM 100 1 MP1 8010016730 150 mounting bracket 1 MP3 8820000530 Flange bolt M4 8 NI 4...

Page 26: ...F FRONT UNIT MP10 F MP17 C MP4 C MP12 C J1 C MP1 C MP9 C Unit abbreviations F FRONT UNIT M MAIN UNIT C CHASSIS PARTS MP7 C MP8 F MP7 C MP10 C SP1 F MP6 F MP7 F MP13 C OPPOSITE DIRECTION TO THE MAIN UNIT MP2 C MP7 C MP2 M MP2 C MP2 C MP8 M MP3 C MP6 M MP5 M MP4 M MP12 M MP11 M MP9 M MP6 C MP2 C MP2 C W1 M ...

Page 27: ...403 3 TL 2SD1819 A R 2SK2414 Z E1 2SK3074 2SK3075 2SK880 GR 3SK184 R DTA143ZUA T106 DTA144EUA T106 DTB123 EK T147 DTC114EUA T106 DTC144 EE TL DTC144EUA T106 XP1501 AB XP4315 FW215 TL MRF137 XP1113 Symbol QY Symbol R25 Symbol R45 Symbol LY3 Symbol LG Symbol UW Symbol UB F Symbol XG Symbol 3R R Symbol 113 Symbol 16 Symbol F12 Symbol 24 Symbol 26 Symbol 5R Symbol 26 Symbol CB Symbol MRF133 Symbol W21...

Page 28: ... CLON GND MICE AFO 8V V M SCAN PRI SQL I MP2 8 1 SECTION 8 BOARD LAYOUTS The combination of this page and the next page show the unit layout in the same configuration as the actual P C Board 8 1 FRONT UNIT TOP VIEW ...

Page 29: ... 5 8 1 8 9 16 W1 W2 SPE SP GND GND SPE SPE SP SP 8V VCC 5V TRC TMUT PSWC CPU5V MICE MIC PTT PTTS GND GND GND GND GND RMUT AFMUT SMUT VCS SCK SO BEEP FISW UNLK PLSTB SO SCK R T PDET SQLI GND GND GND 2 40 1 39 J1 FROM MAIN UNIT J5 8 2 BOTTOM VIEW ...

Page 30: ...SP SP 8V VCC 5V TRC TMUT PSWC CPU5V MICE MIC PTT PTTS GND GND GND GND GND RMUT AFMUT SMUT VCS SCK SO BEEP FISW UNLK PLSTB SO SCK R T NC SQLI GND GND GND 2 40 1 39 J5 TO FRONT UNIT J1 J1 8 2 MAIN UNIT TOP VIEW 8 3 The combination of this page and the next page show the unit layout in the same configuration as the actual P C Board ...

Page 31: ...4 4 5 5 1 1 3 3 1 4 5 8 1 4 5 8 1 4 5 8 1 4 5 8 1 4 5 8 1 8 9 16 1 3 4 5 1 7 8 14 1 4 5 8 1 8 16 9 1 7 8 14 1 4 5 8 1 4 5 8 1 4 5 8 1 8 9 16 MP3 W36 RED W37 BLACK BOTTOM VIEW 8 4 ...

Page 32: ...C33063AD DC DC CONVERT CONTROL IC46 MC33063AD DC DC CONVERT CONTROL Q72 XP4315 Q53 DTB123EK R8 SW Q59 2SC4226 RX VCO D65 HVU350 Q89 XP1501AB POWER SW CTRL D44 MA8051 IC40 TA31136FN 2nd IF IC IC18 TC4W53FU W28 W N SW FI3 CFWM450D CERAMIC BPF T1 ST 82P IMPE CONVERT DANCE IC31 TA75S01F LPF IC13 TC9260F E VOL Q77 2SD1819A AMP AGC Q78 2SD1819A AMP AGC FI1 FL 306 XTAL BPF Q74 2SB798 Q75 2SC4081 S MUTE Q...

Page 33: ... P41 RXD32 70 P42 TXD32 71 P43 IRQ0 72 AVCC 73 PB0 AN0 74 PB1 AN1 75 PB2 AN2 76 PB3 AN3 77 PB4 AN4 78 PB5 AN5 79 IC4 CS 1 SO 2 WP 3 VSS 4 SI 5 SCK 6 HOLD 7 VCC 8 IC3 1 2 3 4 5 6 7 8 IC5 STR 1 D 2 CLK 3 Q1 4 Q2 5 Q3 6 Q4 7 VSS 8 QS 9 QS 10 Q8 11 Q7 12 Q6 13 Q5 14 OE 15 VDD 16 Q2 Q3 D5 MA111 D6 C27 PTT MICE MIC 5V 8V SP 10 J2 DS1 COM4 1 COM3 2 COM2 3 COM1 4 SEG1 5 SEG2 6 SEG3 7 SEG4 8 SEG5 9 SEG6 10...

Page 34: ...MUT L86 ZBFS5101 PT C416 15p L54 82nH C415 27p C91 0 001 C95 27p L19 39nH R95 22k C96 0 001 Q20 2SK3074 C97 0 001 L26 EXCCL3225U L20 56nH C101 33p C98 15p L22 47nH C99 0 001 C521 4 7 R431 6 8k R101 10k R474 4 7 R99 39 R435 1 8k C519 470p C102 22p L21 36nH C100 0 001 C167 0 001 C168 0 1 C103 56p L23 25nH C418 0 001 C500 24p L67 30nH C217 39p C501 22p L35 17nH C502 68p Q21 2SK3075 R25 10k C87 15p R8...

Page 35: ...66 SB07 03C R466 10k R465 10k Q101 DTC144EU G2 S2 S1 Q1 D1 D1 D2 D2 Q94 FW215 8 7 6 5 1 2 3 4 R420 2 2k R419 10k R440 10k D62 SB07 03C Q96 DTC144EU R433 47k Q97 DTC144EU R418 470k R434 10k R441 3 3k C518 1 R417 2 2k 8V VCC 5V C293 330p C292 0 047 C212 470 C231 0 001 C232 1 L53 HK 08S070 1310 D26 DE5SC6M C505 470 Q88 2SK2414 Z 20 19 18 17 16 15 14 13 12 11 BHO BHS BLO BLS VDD VCC ALS ALO AHS AHO 1 ...

Page 36: ...Q59 2SC4226 C548 0 001 L84 3 3uH R458 1k C279 9p C539 10p C546 9p R461 5 6k L41 MC152 E558CN 100024 C547 24p C545 12p L85 6 8uH D65 HVU350 C544 150p L42 0 82uH C288 0 001 R256 2 7k C430 0 01 R372 100 C421 22p L55 0 33uH C422 33p C423 6p R373 100 L56 0 33uH C424 56p R374 100k C425 0 01 C428 0 01 L57 0 33uH Q83 2SC4215 C426 20p C427 39p R376 560k Q84 2SC4215 R436 33k 8 7 6 5 4 3 2 1 FIN2 BS2 BS1 STB...

Page 37: ...com france com Crta de Gracia a Manresa Km 14 750 08190 Sant Cugat del Valles Barcelona SPAIN Phone 93 590 26 70 Fax 93 589 04 46 URL http www icomspain com Corporate Headquarters 2380 116th Avenue N E Bellevue WA 98004 U S A Phone 425 454 8155 Fax 425 454 1509 URL http www icomamerica com Customer Service Phone 425 454 7619 A C N 006 092 575 290 294 Albert Street Brunswick Victoria 3056 Australia...

Page 38: ...6 9 16 Kamihigashi Hirano ku Osaka 547 0002 Japan S 13608HI CD c 2000 Icom Inc ...