ID-51A_E_serv.pdf

S-14914XZ-C1 March 2013 VHF/UHF TRANSCEIVER This service manual describes the latest technical informa- tion for the ID-51A/ID-51E VHF/UHF TRANSCEIVER, at the time of publication. NEVER connect the transceiver to an AC outlet or to a DC power supply that uses more than the specifi ed voltage. This will ruin the transceiver. DO NOT reverse the polarities of the power supply when con- necting the transceiver. DO NOT apply an RF signal of more than 20 dBm (100 mW) to the antenna connector. This could damage the transceivers front-end. To upgrade quality, any electrical or mechanical parts and internal circuits are subject to change without notice or obligation. MODELVERSION SUPPLIED CHARGER ID-51E EURBC-167SD UK ITRBC-167SD ID-51A USABC-167SA KORBC-167SD EXPBC-167SA EXP-01BC-167SD AUSBC-167SV Be sure to include the following four points when ordering replacement parts: 1. 10-digit Icom part number 2. Component name 3. Equipment model name and unit name 4. Quantity required 1110003491 S.IC TA31136FNG ID-51A MAIN UNIT 5 pieces 8820001210 Screw 2438 screw ID-51E Top cover 10 pieces Addresses are provided on the inside back cover for your convenience. ORDERING PARTS 1. Make sure that the problem is internal before dis-assem- bling the transceiver. 2. DO NOT open the transceiver until the transceiver is dis- connected from its power source. 3. DO NOT force any of the variable components. Turn them S-Lowly 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 trans- ceiver is defective. 6. DO NOT transmit power into a Standard Signal Generator or a Sweep Generator. 7. ALWAYS connect a 30 dB to 40 dB attenuator between the transceiver and a Deviation Meter or Spectrum Analyzer, when using such test equipment. 8. READ the instructions of the test equipment thoroughly before connecting it to the transceiver. REPAIR NOTES INTRODUCTION CAUTION (ID-51A) Icom, Icom Inc. and the Icom logo are registered trademarks of Icom Incorporated (Japan) in Japan, the United States, the United Kingdom, Germany, France, Spain, Russia and/or other countries. TABLE OF CONTENTS SECTION 1 SPECIFICATIONS SECTION 2 INSIDE VIEWS SECTION 3 DISASSEMBLY INSTRUCTION SECTION 4 CIRCUIT DESCRIPITON 4-1 RECEIVER CIRCUITS . 4-1 4-2 TRANSMITTER CIRCUITS . 4-2 4-3 FREQUENCY SYNTHESIZER CIRCUITS . 4-4 4-4 VOLTAGE BLOCK DIAGRAM . 4-4 4-5 PORT ALLOCATIONS . 4-5 SECTION 5 ADJUSTMENT PROCEDURES 5-1 PREPARATION . 5-1 5-2 FREQUENCY ADJUSTMENT . 5-3 5-3 TRANSMIT ADJUSTMENT . 5-3 5-4 RECEIVE ADJUSTMENT . 5-11 SECTION 6 PARTS LIST SECTION 7 MECHANICAL PARTS SECTION 8 BOARD LAYOUTS SECTION 9 BLOCK DIAGRAM SECTION 10 VOLTAGE DIAGRAM 1 - 1 SECTION 1. SPECIFICATIONS D General Frequency coverage : (unit: MHz) VersionTXRX EUR, KOR 144146, 430440144146, 430440 UK144146, 430440108174*1, 380479*2 ITR 144146, 430434, 435438 108136.995,*1 144146, 430434, 435438 U.S.A.144148, 430450*3108174*4, 380479*3 EXP137174*4, 400479*2108174*4, 380479*2 EXP-1144148, 430440108174*4, 380479*2 ALL BC Radio (AM): 0.5201.710 MHz BC Radio (FM): 76.0108.0 MHz*5 *1Guaranteed 144146 MHz only *2Guaranteed 430440 MHz only *3Guaranteed 440450 MHz only *4Guaranteed 144148 MHz only *588.0108.0 MHz for the USA version. The SUB band audio signal may be muted, depending on the combination of operating band and mode. Mode : FM, AM (Rx only), DV Number of memory channels : 554 (incl. 50 scan edges and 4 call channels) Number of BC radio memory channels : 500 Usable temp. range : 20C to +60C; 4F to +140F Tuning steps : 1, 5, 6.25, 8.33, 9, 10, 12.5, 15, 20, 25, 30, 50, 100, 125 and 200 kHz * The selectable steps may differ, depending on the selected fre- quency band or operating mode. Frequency stability : 2.5 ppm (20C to +60C; 4F to +140F) Power supply : 10.016.0 V DC for external DC power, or specifi ed Icoms battery pack Digital transmission speed : 4.8 kbps Voice coding speed : 2.4 kbps Current drain (at 7.4 V DC) : TX (at 5 W) Less than 2.5 A RX Max. output FM Less than 350 mA (Internal speaker) Less than 200 mA (External speaker) DV Less than 450 mA (Internal speaker) Less than 300 mA (External speaker) Antenna connector : SMA (50 ) Dimensions : 58(W)105.4(H)26.4(D) mm; (projections not included) 2.3(W)4.1(H)1.0(D) in Weight (approximately) : 255 g; 9 oz (incl. battery pack and antenna) D Transmitter Modulation system : FM Variable reactance frequency modulation DV GMSK reactance frequency modulation Output power (at 7.4 V DC) : High 5.0 W, Mid. 2.5 W, Low2 1.0 W, Low1 0.5 W, S-Low 0.1 W (Typical) Max. frequency deviation : 5.0 kHz (FM wide: approx.) 2.5 kHz (FM narrow: approx.) Spurious emissions : Less than 60 dBc at High/Mid. Less than 13 dBm at Low2/ Low1/S-Low Ext. mic. impedance : 2.2 k D Receiver Receive system : Double-conversion superheterodyne Intermediate frequencies A Band : 46.35 MHz (1st IF) : 450 kHz (2nd IF) B Band : 61.65 MHz (1st IF) : 450 kHz (2nd IF) Sensitivity (except spurious points) FM (1 kHz/3.5 kHz Deviation; 12 dB SINAD) : Less than 15 dB DV (PN9/GMSK 4.8 kbps; BER 1%) : Less than 11 dB Audio output power (at 10% distortion) Internal speaker : More than 0.4 W with a 16 load External speaker : More than 0.2 W with a 8 load Selectivity FM (Wide) : More than 55 dB FM (Narrow), DV : More than 50 dB Ext. speaker connector : 3-conductor 3.5(d) mm; (18)/8 Spurious and image rejection ratio : More than 60 dB Squelch Sensitivity (threshold, 1 kHz/3.5 kHz Deviation) : Less than 15 dB 2 - 1 SECTION 2. INSIDE VIEWS DSP LOGIC UNIT LEVEL CONVERTER (IC21) EEPROM (IC7) MIC SW (Q21) PTT SW (Q20) 3VS LINE REGULATOR (IC12) AF AMP (IC2) DSP FLASH MEMORY (IC20) MIC MUTE SW (IC16) MODE SW (IC390) EEPROM (IC3) CPU (IC5) CLOCK OSCILLATOR (For the CPU) (X2) microSD CARD SLOT (J3) GPS REGULATOR (IC10) VCC LINE REGULATOR (IC4) AF AMP (IC300) TONE FILTER (Q330) AF FILTER (IC350) CPU3 LINE REGULATOR (IC9) TONE FILTER (Q370) CHARGING CONTROLLER (IC8) 2 - 2 MAIN UNIT (TOP VIEW) VCC LINE SW (Q8) POWER AMP (Q45) 3VS LINE REGULATOR (IC12) PLL IC (Band A) (IC6) DISCRIMINATOR (Band A) (X2) 2ND IF FILTER (Band A) (For DV and FM-N modes) (FI1) AGC DETCTOR (Q903) 2ND IF FILTER (Band A) (For FM mode) (FI2) DISCRIMINATOR (Band B) (X900) PLL IC (Band B) (IC450) D/A CONVERTER (IC952) ATT (Q906) REFERENCE FREQUENCY OSCILLATOR (X1) AM DETECTOR (Q904) APC AMP (IC14) +5 V REGULATOR (IC15) VCC LINE SW (Q2) ATT (Q907) CURRENT DETECTOR (IC5) LOCK VOLTAGE BUFFER (Q451) 2ND IF FILTER (Band B) (For FM and AM modes) (FI900) +4 V REGULATOR (IC3) RF AMP (Q780) 2 - 3 MAIN UNIT (BOTTOM VIEW) UHF RF AMP (Band A/B) (Q602) VHF RF AMP (Band A/B) (Q702) 5VS LINE REGULATOR (IC4) IF IC (Band B) (IC901) 1ST IF AMP (Band B) (Q901) 1ST IF FILTER (Band B) (FI880) UHF RF AMP (Band B) (Q641) VHF RF AMP (Band B) (Q740) UHF RF AMP (Band A) (Q601) VHF RF AMP (Band A) (Q701) AF AMP (IC2) PS3 LINE REGULATOR (IC13) CHARGING CONTROLLER (IC8) 1ST IF FILTER (Band A) (FI3) DRIVE AMP (Q41) RADIO IC (IC441) IF IC (Band A) (IC13) RADIO AUDIO BUFFER (IC955) +3.3 V REGULATOR (IC11) 3 - 1 SECTION 3. DISASSEMBLY INSTRUCTION BE CAREFUL about the fl at cable and connector when separating the LOGIC UNIT from the chassis. 1. REMOVING THE LOGIC UNIT 1) Remove 2 dials and antenna nut from the front panel. 2) Remove 2 screws from the bottom of chassis. 3) Take out the LOGIC UNIT with chassis from the front panel. 4) Remove 6 screws from the LOGIC UNIT. 5) Unsolder 6 points at the rotary encoder. 6) Separate the LOGIC UNIT from the chassis, and then disconnect the fl at cable from the LOGIC UNIT. ? ? Inner dial Outer dial Antenna nut Remove with; “ICOM Driver (Q)” (8960000370) ? ? Screws ? ? LOGIC UNIT with chassis Front panel ? ? UNSOLDER Solder remover Screws x5 LOGIC UNIT Rotary encoder ? ? FLAT CABLE Lift up flat cable LOGIC UNIT Chassis Suction lifter Suction lifter Part name : EA950R-2 Manufacture : ESCO CO.LTD For easy separation of the CHASSIS Use a suction lifter to lift the bottom of the CHASSIS up. (Continued on page 3-2) 3 - 2 2. REMOVING THE MAIN UNIT 1) Unsolder 2 points on the shield plate. Shield plate UNSOLDER Solder remover Screws x5 MAIN UNIT Shield plate UNSOLDER Solder remover Screws x6 Chassis AIN UNIT 2) Remove 5 screws from the shield plate, and then remove it. 3) Unsolder a point at the antenna connector. 4) Remove 6 screws from the MAIN UNIT, and then remove the MAIN UNIT from the chassis. 4 - 1 RF CIRCUITS SECTION 4. CIRCUIT DESCRIPTION 4-1 RECEIVE CIRCUITS RF CIRCUITS VHF BAND (108174 MHz) The RF signal from the antenna is passed through two LPFs (L513, L515, L516, C547, C549, C553, C555 and C556), ANT SW (D506, D903) and BPF (L705, L706, L909, C724 and C976), and then applied to the RF AMP (Q702). Band A (137174 MHz) The amplifi ed signal is passed through the BPF (D705, L703 and C715) and AGC circuit (Q49, Q50, D34, D704), and then applied to the RF AMP (Q701). The amplifi ed signal is applied to the 1st IF circuit, through the BPF (D702, D703, L701, C703 to C705). Band B (108174 MHz) The amplifi ed signal is passed through the ATT (D745), BPF (D744, L742 and C753) and AGC circuit (Q903, D743), and then applied to the RF AMP (Q740). The amplifi ed signal is applied to the 1st IF circuit, through the BPF (D741, D742, L740, C741 to C743). D506,D903 RX:380.000M479.000MHz D501 D508 D510 RX:108.000M174.000MHz TX:400.000M479.000MHz TX:136.000M174.000MHzD503,D504 From the TX circuit From the TX circuit Q702 D705D702,D703 Q740 -Band A:137M-174MHz- -Band B:108M-174MHz- D744 Q701 D741,D742 -Band A:380M479MHz- Q601 Q602 D605,D606 -Band B:380M479MHz- Q641 108M-174MHz 380M-479MHz D602,D603 D642,D643D645,D646 AGC AGC AGC AGC Q49,Q50,D34 Q903,D743 Q49,Q50,D34 Q903,D644 D704 D604 D745 To the 1st IF circuit (Band A). To the 1st IF circuit (Band B). To the 1st IF circuit (Band B). To the 1st IF circuit (Band A). ANT SW HPF LPF LPFLPF ANT SW LPF BPF BPF RF AMP BPF BPF RF AMP RF AMP RF AMP RF AMP BPF RF AMP BPFBPF BPF ATT UHF BAND (380479 MHz) The RF signal from the antenna is passed through the HPF (L512, L514, C545, C548, C550, C551 and C554), two LPFs (L511, C536, C539 and L507, C524, C526, C529), ANT SW (D508 and D510) and BPF (L608, L610, L612, C630, C631 and C634), and then applied to the RF AMP (Q602). Band A The amplifi ed signal is passed through the two BPFs (D605, L605, C615 and D606, L606, C619) and AGC circuit (Q49, Q50, D34, D604), and then applied to the RF AMP (Q601). The amplifi ed signal is applied to the 1st IF circuit, through the BPF (D602, D603, L602, L603, C603 to C605, C607, C907). Band B The amplifi ed signal is passed through the BPF (D645, D646, L644, L645, C654, C655, C658) and AGC circuit (Q903, D644), and then applied to the RF AMP (Q641). The amplifi ed signal is applied to the 1st IF circuit, through the BPF (D642, D643. L641, L642, C642 to C644, C646 and C972). 1ST IF CIRCUITS 4 - 2 1ST IF CIRCUITS VHF BAND (108174 MHz) Band A (137174 MHz) The RX signal from the RF circuit is applied to the 1st mixer (Q820) and mixed with the 1st LO signal, resulting in the 46.35 MHz 1st IF signal. The converted signal is passed through the RF SW (D820), 1st IF fi lter (FI3) and limiter (D23), and then applied to the 1st IF AMP. (Q44). The amplifi ed signal is ap- plied to the 2nd IF circuit, through the limiter (D22). Band B (108174 MHz) The RX signal from the RF circuit is applied to the 1st mixer (Q830) and mixed with the 1st LO signal, resulting in the 61.65 MHz 1st IF signal. The converted signal is passed through the RF SW (D830), 1st IF fi lter (FI880) and limiter (D880), and then applied to the 1st IF AMP. (Q901). The amplifi ed signal is applied to the 2nd IF circuit. -Band A:46.35MHz- -Band B:61.65MHz- D22FI3 A_LO 1st LO 1st LO LIMIT 46.35MHz Q44 LIMIT D23 Q901 B_LO 61.65MHz D880FI880 Q811 VCO1 UNIT Q830 D812,D831 Q801 Q820 D811,D830 LIMIT VCO2 UNIT D801,D820 D802,D821 To the 2nd IF circuit (Band A). To the 2nd IF circuit (Band B). From the RF circuit (Band A). From the RF circuit (Band A). From the RF circuit (Band B). From the RF circuit (Band B). BPF XTALIF AMP IF AMPBPF XTALRF SW RF SW RF SW RF SW UHF BAND (380479 MHz) Band A The RX signal from the RF circuit is applied to the 1st mixer (Q801) and mixed with the 1st LO signal, resulting in the 46.35 MHz 1st IF signal. The converted signal is passed through the RF SW (D801), 1st IF fi lter (FI3) and limiter (D23), and then applied to the 1st IF AMP. (Q44). The amplifi ed signal is ap- plied to the 2nd IF circuit, through the limiter (D22). Band B The RX signal from the RF circuit is applied to the 1st mixer (Q811) and mixed with the 1st LO signal, resulting in the 61.65 MHz 1st IF signal. The converted signal is passed through the RF SW (D811), 1st IF fi lter (FI880) and limiter (D880), and then applied to the 1st IF AMP. (Q901). The amplifi ed signal is applied to the 2nd IF circuit. 4 - 3 2ND IF CIRCUITS Band A The 1st IF signal from the 1st IF circuit is applied to the IF IC (IC13, pin 16), which contains the 2nd IF AMP, 2nd mixer, FM demodulator, and so on. The 1st IF signal is mixed with the 45.9 MHz 2nd LO signal, resulting in the 450 kHz 2nd IF signal. The converted sig- nal is passed through the external 2nd IF fi lter (FM mode; FI2, FM-N or DV mode; FI1) to remove sideband noise. The fi ltered signal is amplifi ed by the 2nd IF AMP, and then de- modulated by the quadrature detector (X2). The demodulated signal is applied to the RX AF circuit (For FM and FM-N modes) or digital demodulation circuit (For DV mode). Q38 X1 15.3MHz X3 REF 45.9MHz -Band A:46.35MHz- -Band B:61.65MHz- SW FM DISCRI FM-N/DV D16,D18,D19 IC13 FI2 W/N FI1 X2 Q36,D15 FI900 DISCRI X900 FM IC901 Q900 61.2MHz REF X4 IC18 MODE SW Q904 From the 1st IF circuit (Band A). To the RX AF circuit (Band A). To the RX AF circuit (Band B). From the 1st IF circuit (Band A). BPF BPF CERAMIC BPF CERAMIC BPF CERAMIC BPF AM DET DET FM DET FM Band B The 1st IF signal from the 1st IF circuit is applied to the