ID 31A E SERVICE MANUAL

Id 31a E Service Manual-PDF Download

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INTRODUCTION, This ser vice manual descr ibes the latest technical. information for the ID 31A ID 31E UHF TRANSCEIVER at. the time of publication,MODEL VERSION,USA BC 167SA. KOR BC 167SD,ID 31A EXP BC 167SA,EXP 01 BC 167SD,AUS BC 167SV. EUR BC 167SD,ID 31E UK N A,ITR BC 167SD, To upgrade quality any electrical or mechanical parts and. internal circuits are subject to change without notice or. obligation, NEVER connect the transceiver to an AC outlet or to a DC.
power supply that uses more than the specified voltage. 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 transceiver s. ORDERING PARTS REPAIR NOTES, Be sure to include the following four points when ordering 1 Make sure that the problem is internal before dis. replacement parts assembling the transceiver, 2 DO NOT open the transceiver until the transceiver is. 1 10 digit Icom part number disconnected from its power source. 2 Component name 3 DO NOT force any of the variable components Turn them. 3 Equipment model name and unit name slowly and smoothly. 4 Quantity required 4 DO NOT shor t any circuits or electronic par ts An. insulated tuning tool MUST be used for all adjustments. ORDER EXAMPLE 5 DO NOT keep power ON for a long time when the. 1110003491 S IC TA31136FNG ID 31A MAIN UNIT 5 pieces transceiver is defective. 6 DO NOT transmit power into a Standard Signal Generator. 8820001210 Screw 2438 screw ID 31E Top cover 10 pieces. or a Sweep Generator, 7 ALWAYS connect a 30 40 dB attenuator between the.
Addresses are provided on the inside back cover for your. convenience transceiver and a Deviation Meter or Spectrum Analyzer. when using such test equipment, 8 READ the instructions of the test equipment throughly. before connecting it to the transceiver, 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 3,4 4 VOLTAGE DIAGRAM 4 3. 4 5 PORT ALLOCATIONS 4 4,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 7,SECTION 6 PARTS LIST,SECTION 7 MECHANICAL PARTS. SECTION 8 BOARD LAYOUTS,SECTION 9 BLOCK DIAGRAM,SECTION 10 VOLTAGE DIAGRAM.
SECTION 1 SPECIFICATIONS,D General D Transmitter,Frequency coverage unit MHz Modulation system. Version TX RX FMVariable reactance freq modulation. U S A 420 450 1 400 479 1 DVGMSK reactance freq modulation. AUS 420 450 2 400 479 2 Output power at 7 4 V DC High 5 0 W Mid 2 5 W Low 0 5 W. EUR KOR 430 440 430 440 Typical S Low 0 1 W, UK 430 440 400 479 2 Max frequency deviation 5 0 kHz FM wide approx. ITR 430 434 435 438 430 434 435 438 2 5 kHz FM narrow approx. EXP 400 479 2 400 479 2 Spurious emissions Less than 60 dBc at High Mid. EXP 1 430 440 400 479 2 Less than 13 dBm at Low S Low. 1Guaranteed 440 450 MHz only 2Guaranteed 430 440 MHz only. Ext mic impedance 2 2 k,Mode FM FN N DV,D Receiver. No of memory channels 552 Receive system Double conversion superheterodyne. incl 50 scan edges and 2 call channels Intermediate frequencies 46 35 MHz 1st IF. Usable temp range 20 C to 60 C 4 F to 140 F 450 kHz 2nd IF. Tuning steps 5 6 25 10 12 5 15 20 25 30 50 Sensitivity except spurious points. 100 125 and 200 kHz FM 1 kHz 3 5 kHz Dev 12 dB SINAD Less than 15 dB. Frequency stability 2 5 ppm DV PN9 GMSK 4 8 kbps BER 1 Less than 11 dB. 20 C to 60 C 4 F to 140 F Audio output power at 10 distortion. Power supply 10 0 16 0 V DC for external DC power Internal speaker More than 0 4 W with a 16 load. or specified Icom s battery pack External speaker More than 0 2 W with a 8 load. Digital transmission speed 4 8 kbps Selectivity, Voice coding speed 2 4 kbps FM Wide More than 55 dB. Current drain at 7 4 V DC FM Narrow DV More than 50 dB. TX at 5 W Less than 2 5 A Ext speaker connector 3 conductor 3 5 d mm 1 8 8. RX Max output FM Less than 350 mA Internal speaker Spurious and image rejection ratio. Less than 200 mA External speaker More than 60 dB, DV Less than 450 mA Internal speaker Squelch Sensitivity threshold 1 kHz 3 5 kHz Dev.
Less than 300 mA External speaker Less than 15 dB,Antenna connector SMA 50. Dimensions 58 W 95 H 25 4 D mm,projections not included 2 3 W 3 7 H 1 D in. Weight approximately 140 g 4 94 oz,without battery pack case and ant. All stated specifications are subject to change without notice or obligation. SECTION 2 INSIDE VIEWS,LOGIC UNIT,RX TX LED DRIVER. 3 3 V REGULATOR,BACKUP BATTERY MIC VOX AMP,For the real time clock IC19.
LOGIC UNIT,BOTTOM VIEW,CLOCK OSCILLATOR For the CPU. GPS MODULE CONTROLLER CPU,EEPROM For the CPU,DATA LEVEL CONVERTER IC7. IC21 CLOCK OSCILLATOR,EEPROM For GPS data For the DSP. IC3 DSP X3,SERIAL DATA INTERFACE,IC2 SERIAL FLASH MEMORY. 3 3 V REGULATOR IC20,IC9 CLOCK BUFFER,CPU RESET IC For the CODEC.
MicroSD CARD SLOT,DUAL INVERTER GATE J3,AF SW AF FILTER. DUAL STEP DOWN COVERTER,MIC GAIN SW REAL TIME CLOCK IC. CLOCK OSCILLATOR,For the real time clock IC,CURRENT DETECTION IC. VCC LINE SW,VCC LINE SW,5 V REGULATOR,2ND IF FILTER For FM mode. CHARGING LINE SW,LOCK VOLTAGE BUFFER 2ND IF FILTER.
Q26 For DV FM N mode,REFERENCE FREQUENCY,OSCILLATOR DISCRIMINATOR. D A CONVERTER,5 V REGULATOR IC9,3 V REGULATOR,BOTTOM VIEW. 1ST IF MIXER,1ST IF FILTER,TX POWER SETTING,VOLTAGE BUFFER. AF POWER AMP IC14,BPF TUNING VOLTAGE,CHARGING LINE DRIVER BUFFER. AF LINE SW 4 V REGULATOR,TONE FILTER,STEP DOWN CONVERTER.
AF POWER AMP,SECTION 3 DISASSEMBLY INSTRUCTION, 1 REMOVING THE LOGIC UNIT 4 Remove 5 screws from the LOGIC UNIT. 1 Remove 2 dials and antenna nut from the front panel 5 Unsolder 6 points at the rotary encoder. Inner dial,Antenna nut Screws x5,Remove with Outer dial. ICOM Driver Q,8960000370 Solder,LOGIC UNIT,2 Remove 2 screws from the bottom of chassis. Rotary encoder,6 Separate the LOGIC UNIT from the chassis and. then disconnect the coaxial cable from the LOGIC,3 Take out the LOGIC UNIT with chassis from the.
front panel BE CAREFUL about the coaxial cable and connector. LOGIC UNIT when separating the LOGIC UNIT from the chassis. with chassis,LOGIC UNIT,Coaxial cable,Front panel,For easy separation of the CHASSIS. Use a suction lifter to lift the bottom of the CHASSIS up. Suction lifter,Part name EA950R 2,Manufacture ESCO CO LTD. Suction lifter,Continued on page 3 2, 2 REMOVING THE MAIN UNIT 3 Unsolder a point at the antenna connector. 1 Unsolder 3 points on the shield plate,Solder remover. 2 Remove 5 screws from the shield plate and then 4 Remove 6 screws from the MAIN UNIT and then. remove it remove the MAIN UNIT from the chassis,Shield plate.
SECTION 4 CIRCUIT DESCRIPTION,4 1 RECEIVE CIRCUITS. RF CIRCUITS MAIN UNIT RX AF CIRCUITS MAIN AND LOGIC UNITS. The RX signal from the antenna is passed through two LPFs While operating in the DV mode. L32 L34 C302 C303 C306 C307 C312 and L29 C281 The demodulated AF signal is passed through the LPF MAIN. C285 ANT SW D24 D25 D31 D33 L36 C313 C315 UNIT R118 R121 C122 C130 C135 and then applied to. C319 and tuned BPF D32 L43 C353 and then applied to the digital demodulation circuits on the LOGIC UNIT. the RF AMP Q47, The AF signal from the MAIN UNIT is amplified by the AF. The amplified signal is passed through the tuned BPF D27 D29 AMP LOGIC UNIT IC13A pins 1 2 and passed through the. D30 L28 L31 L33 C286 C290 C292 C293 C297 C299 LPF LOGIC UNIT IC13B pins 6 7 and then applied to the. C301 C304 C305 and then applied to the 1st IF circuits liner CODEC LOGIC UNIT IC15 pin 3 to be encoded in to. a digital audio signal,RF CIRCUITS, The digital audio signal is demodulated by the DSP LOGIC. D31 D33 UNIT IC18 and then applied to the linear codec LOGIC. From the TX AMP circuits ANT, SW LPF LPF UNIT IC15 to be decoded into an analog audio signal. D27 D29 D30 D32,To the 1st IF circuits,BPF RF BPF,The decoded AF signal is applied to the MAIN UNIT.
The AF signal is passed through the mode SW MAIN UNIT. IC8 pins 3 4 and AF filters MAIN UNIT IC9B pins 6 7. and IC9C pins 9 10 and then applied to the D A converter. 1ST IF CIRCUITS MAIN UNIT,MAIN UNIT IC11 pin 13 to be adjusted in level. The RX signal from the RF circuits is applied to the 1st IF. mixer Q46 and mixed with the 1st LO signal from the VCO. DIGITAL DEMODULATION CIRCUITS, Q27 D10 D12 resulting in the 46 35 MHz 1st IF signal. RTONE LINEAR DAFO To the RX AF circuits, The 1st IF signal is passed through the 1st IF filter FI3 and CODEC. limiter D23 and then applied to the 1st IF AMP Q44 The IC13B. amplified signal is passed through another limiter D22 and. then applied to the 2nd IF circuits DSP,1ST IF CIRCUITS. 1st LO To the RF circuits DDET From the 2nd IF circuits. From the VCO LPF AMP LPF,To the 2nd IF circuits LIMIT IF LIMIT XTAL.
While operating in the FM FM N mode, The demodulated AF signal is passed through the LPF R272. C355 mode SW MAIN UNIT IC8 pins 1 2 and AF filters. 2ND IF CIRCUITS MAIN UNIT MAIN UNIT IC9B pins 6 7 and IC9C pins 9 10 and then. The 1st IF signal from the 1st IF circuits is applied to the IF IC applied to the D A converter MAIN UNIT IC11 pin 13 to be. IC13 pin 16 The IF IC contains the 2nd mixer 2nd IF AMP adjusted in level. detector and so on in its package, The 1st IF signal is mixed with the 2nd LO signal from the The level adjusted AF signal is amplified by the AF power. reference frequency oscillator TCXO X1 resulting in the AMP MAIN UNIT IC2 pin 1 and then output from the in. 450 kHz 2nd IF signal The 2nd IF signal is passed through ternal speaker CHASSIS SP1 or external speaker through. the 2nd IF filter FI1 for DV FM N mode FI2 for FM mode the SP jack MAIN UNIT J4. to remove sideband noise The filtered signal is amplified by. the 2nd IF AMP and demodulated by the quadrature detector RX AF CIRCUITS. with discriminator X2 IC11,SP IC16 From the digital. VO IC2 demodulation circuits, The demodulated AF signal is applied to the RX AF circuits AF. IC9B C IC8,2ND IF CIRCUITS AFON,Q38 FM N DV FM,CERAMIC CERAMIC.
REF X3 BPF BPF,15 3MHz From the 2nd IF circuits,45 9MHz FI1 FI2 SP1. W N CHASSIS UNIT,BPF SW Q36 D15,D16 D18 D19,To the digital From the 1st IF circuits. demodulation circuits IF IC,To the RX AF circuits DISCRI. 4 2 TRANSMIT CIRCUITS, TX AF CIRCUITS LOGIC AND MAIN UNITS When operating in the FM FM N mode. The AF signal from the internal or external microphone MIC The amplified signal is passed through the MIC mute SW. signal is applied to the MIC AMP LOGIC UNIT IC19B pin 5 LOGIC UNIT IC16 pins 1 7 and then applied to the MAIN. When operating in the DV mode, The amplified signal is passed through the MIC mute SW The MIC signal is passed through the HPF MAIN UNIT R78.
LOGIC UNIT IC16 pins 1 7 and then further amplified by C77 C80 BPF MAIN UNIT IC9A pins 1 3 LPF MAIN. the ALC AMP LOGIC UNIT IC14 pin 1 The amplified sig UNIT IC9D pins 13 14 and mode SW MAIN UNIT IC8. nal is applied to the liner CODEC LOGIC UNIT IC15 pin 2 pins 8 9 and then applied to the D A converter MAIN UNIT. through the buffer LOGIC UNIT IC12B pins 6 7 to be en IC11 pin 18 to be adjusted in level. coded into a digital audio signal, The digital audio signal is processed by the DSP LOGIC The level adjusted signal is applied to the modulation cir. UNIT IC18 and then applied to the linear codec LOGIC cuits. UNIT IC15 to be converted into the digital baseband signal. The digital baseband signal is passed through the LPF LOGIC. UNIT IC12A pins1 3 and then applied to the MAIN UNIT. The digital baseband signal is passed through the mode SW. MAIN UNIT IC8 pins 10 11 and then applied to the D A. converter MAIN UNIT IC11 pin 18 to be adjusted in level. TX AF CIRCUITS,LOGIC UNIT MAIN UNIT, MIC MMUTE FM mode MODE MOD To the modulation circuits. MC1 AMP HPF BPF LPF DV SW D A,Q18 IC19B IC9A IC9D IC8 Q22. GAIN DV mode,AMP BUFF DMI LINEAR,DMO LPF DMOD,EXTMIC CODEC. IC14 IC12B IC12A, MODULATION CIRCUITS MAIN UNIT TX AMP CIRCUITS MAIN UNIT.
The MIC signal from the TX AF circuits is applied to the VCO The TX signal is passed through the buffer Q48 and. Q27 D10 D12 as a modulation signal The modulation sig attenuator D20 D21 which controls the TX output power by. nal is applied to D10 to obtain GMSK For DV mode or Fre the APC AMP IC14 The TX signal is sequentially amplified. quency Modulation For FM mode by the YGR Q39 and drive AMP Q41 and then passed. through the LPF L42 C250 C351 The filtered TX signal is. The modulated VCO output signal is passed through the buf applied to the power AMP Q45. fer Q30 and amplified by the LO AMP Q32 and then ap. plied to the TX AMP circuits as the TX signal through the LO The amplified TX signal is passed thro. This service manual describes the latest technical information for the ID 31A ID 31E UHF TRANSCEIVER at the time of publication NEVER connect the transceiver to an AC outlet or to a DC

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