0 ICOM Sane MANUAL VHF AIR BAND TRANSCEIVER I1C-A2O0 Icom Inc.INTRODUCTION This service manual contains information relative to the theoretical, physical, mechanical and electrical characteristics of the IC-A20 VHF AIR BAND TRANSCEIVER. ASSISTANCE If you require assistance or further information regarding the operation and capabilities of the IC-A20, please contact your nearest authorized ICOM Dealer or ICOM Service Center. ORDERING PARTS For the fastest service, supply all of the following information when ordering parts from your dealer or ICOM Service Center: 1. Equipment model and serial number 2. Schematic part identifier (e.g., 1C301, Q318) 3. Printed circuit board name and number (e.g., RF UNIT/ B-1461B) 4. Part number and name (e.g., 25C2668 Transistor) 5. Quantity required (e.g., 3pcs.) REPAIR NOTE 1. DO NOT open transceiver covers until the transceiver is disconnected from a power source. 2. DO NOT connect the transceiver to an external power source of more than 16V. 3. DO NOT force any of the variable components. Turn them slowly and smoothly. 4, DO NOT short any circuits or electronic parts. 5. An insulated tuning tool MUST BE used for all adjustments. 6. DO NOT keep power ON for a long time when the transceiver is defective. 7. DO NOT transmit power into a signal generator or sweep generator. Always connect a 30dB or 40dB attenuator between the transceiver and a deviation meter or spectrum analyzer when using such test equipment. 8. Read the instructions of test equipment thoroughly before connecting the equipment to the transceiver.TABLE OF CONTENTS SECTION 1 SPECIFICATIONS .. SECTION OUTSIDE AND INSIDE VIEWS. 1 OUTSIDE VIEWS 2 INSIDE VIEWS. SECTION 3 BLOCK DIAGRAM..... ‘SECTION CIRCUIT DESCRIPTION. RECEIVER CIRCUITS....... ‘TRANSMITTER CIRCUITS .- PLL CIRCUITS . 1 2 3 ‘ -4 POWER SUPPLY CIRCUITS. 5 6 7 LOGIC CIRCUITS (LOGIC UNIT) VOR CIRCUITS (VOR UNIT). OTHER CIRCUITS. SECTION MECHANICAL PARTS AND DISASSEMBLY. 1 CASE DISASSEMBLY... 2. TOP PANEL DISASSEMBLY 3 PA AND EXTERNAL JACK DISASSEMBLY. 4 SPEAKER AND MICROPHONE DISASSEMBLY. 5 : 6 PTT SEAL DISASSEMBLY . UNIT BOTTOM DISASSEMBLY. ADJUSTMENT PROCEDURES. 1 PLL ADJUSTMENT 2 RECEIVER ADJUSTMENT +3. TRANSMITTER ADJUSTMENT 4 VOR ADJUSTMENT ‘SECTION SECTION BOARD LAYOUTS........ INTERCONNECTIONS LoGic UNIT. RF AND VCO UNITS. SECTION VOLTAGE DIAGRAMS ... 1 LoGic UNIT. 2 VOR UNIT. 3. MAIN UNIT. 4 RF AND VCO UNITS. SECTION PARTS LIST. ‘The SCHEMATIC DIAGRAM Is attached at the end of this service manual. 2-1~4 4—1~7 4-1 4-3 4-4 4-5 4-5 4-6 4-7 5—1~5 5-1 5-3 5-4 5-4 5-5 5-5 —1~6SECTION 1 SPECIFICATIONS MGENERAL ‘Antenna impedance 500 unbalanced Memory channels 18 Channel spacing 2 25kHz Frequency stability 0.002% at -10°C~+50°C Usable temperature range -10°C~+0°C Dimensions £65(74)mm(w) x 198(208) mm(H) x35(42)mm(O) Bracketed values include projections. Woight 675g (including CM-7G BATTERY PACK and flexible antenna) Power supply 2 192V DC+15% Current drain (at 13.2V DC) + Recelving Standby 50mA ‘At max. audio output 220mA Transmitting HIGH (6.0W) 900ma Low (1.6™) 600ma IETRANSMITTER Frequency range + 198,000~195.975 MHz ‘Antenna output power (typical) «= «HIGH 5.0W PEP (1.6W carrier power) LOW 1.6W PEP (0.5W carrier power) Power shows PEP with 85% modulation by a 1kHz audio tone Emission mode + ASE 6KOO (643) Modulation system + Low level modulation RECEIVER Receiving system + Doublecconversion superheterodyne Intermediate frequencies 1st 35.8MH2 2nd 455kHz Frequency range + 108,000~195.975MHz NAV BAND 108,000~117.975MHz COM BAND 118,000~135.975MHz Sensitivity (with 509 load) : NAV BAND 2uV for 6dB SIN with 1kHz, 90% modulation COM BAND nV for 6d8 SIN with 1kHz, 30% modulation ‘Audio output power 2 0SW at 10% distortion Squelch sensitivity (threshold) : NAV BAND 1pVv COM BAND O5nV Spurious response rejection ratio: 60dBSECTION 2 OUTSIDE AND INSIDE VIEWS 2-1 OUTSIDE VIEWS 24-1 TOP PANEL EXTERNAL DC POWER JACK. EXTERNAL MIC JACK EXTERNAL SPEAKER JACK ANTENNA CONNECTOR VOLUME CONTROL and POWER SWITCH RF OUTPUT POWER SWITCH ‘SQUELCH CONTROL, 2-4-2 FRONT AND SIDE PANELS FLEXIBLE ANTENNA FUNCTION DISPLAY FUNCTION SWITCH: Lich swroH prrswirex KEYBOARD | | SPEAKER ‘MICROPHONE BATTERY PACK RELEASE BUTTON | BATTERY CHARGE INDICATOR CHARGER JACK B CHARGER JACK A: (For external 13.8V DC power source) CM-7G BATTERY PACK:2-1-3 FUNCTION DISPLAY DUPLEX INDICATOR FUNCTION INDICATOR TRANSMIT INDICATOR RECEIVE INDICATOR LOCKOUT CHANNEL INDICATOR KEY LOCK INDICATOR [) DUP: W @ LOCK OUT A £ (60 “i Mle BEARING BATTERY To [FROM] If |adtaaas MEMORY CHANNEL INDICATOR FREQUENCY DISPLAY SCAN UP/DOWN INDICATORS COURSE INDICATOR TO-FROM FLAG INDICATORS: LOW BATTERY INDICATOR. (COURSE DEVIATION INDICATOR 2-2 INSIDE VIEWS 2-2-1 LOGIC UNIT Backlight (DS702 HRS-7219A-G40) Backlight (0S703 HRS-7219A-G40) CPU (IC701 PD7514G-307-12) a CPU clock (X701 345.6kHz)——————_> EES =, LLLLLLL LILLE LNW Speaker (SP701 40P-177B) Microphone (EP701 KUC-2023-01-006) Speaker plate (43709)2-2-2 VOR UNIT Comparator (IC604 BA6993F) Buffer amp (IC601 NJM3403AM) VOR control (Q603 RN2403) 30Hz amp circuit (IC603 LPC358G) VOR sensor circuit 2-2-3 MAIN UNIT INT/EXT reverse connect protect circuit selector Beep circuit AF power amp circuit (IC104 LM386N-3) Mic amp circuit AM detector circuit ‘Ceramic filter (F1101 CFUM455B) Ceramic filter (Fl102 CFUM455D) Regulator (IC102 S81250HG) ‘Crystal filter (X102 CDB455C7A) Low power FM IF circuit (1C103 TK10420) Lithium backup battery (BT101 BR2325-1HC) RX 2nd local oscillator (X101 35.345 MHz)2-2-4 RF AND VCO UNITS ALC detector circuit TX RF circuit ALG control circuit AM modulator circuit VCO UNIT PLL circuit: Reference oscillator (X301 12.8MHz) LPF Antenna switching circuit RX RF circuit 1st mixer (Q302 25K241) Crystal filter (FI301 FL-98 35M20B) ‘st IF amp circuitSe LINN 91907 LINN YON = 4 ac SG bd a 4 rz) fo) a [os] SECTION 3 ALND 4a AINA NIVWSECTION 4 CIRCUIT DESCRIPTION 4-1 RECEIVER CIRCUITS 4-1-1 ANTENNA SWITCHING CIRCUIT (RF UNIT) Receiver signals enter the RF UNIT from the ANTENNA, CONNECTOR and pass through a Chebyschev low-pass filter consisting of L325, L326 and C396~C400. The antenna switching circuit employs a A/4-type diode switching system consisting of 0314, D315, 312, L324 and others. While receiving, 0314 and D315 turn OFF and the receive signals are applied to the RF circuit via C301, 4-4-2 RF CIRCUIT (RF UNIT) The receive signals from the antenna switching circuit pass through a bandpass filter consisting of, L301, L302, €902~C305, D301 and 0302. They are then amplified at RF amplifier Q301. After being amplified at Q301, the recelve signals are fed to 1st mixer 0302 via a bandpass filter consisting of 1303~L305, 311~C314 and 0303~D305. Band- RECEIVER RF AND 1st IF CIRCUITS pass filters suppress out-of-band signals. Diodes 'D301~D305 are varactor diodes that track the band: pass filters and are controlled by a output voltage from the charge pump. These diodes tune the center frequency of the bandpass filters for wide bandwidth reception and good image response rejection. Reception with good image response rejection is ensured as 901-1302, L303-L304 and 11904-1308 are magnetically coupled. 4-13 1st MIXER CIRCUIT (RF UNIT) Receive signals from the bandpass filter are mixed with LO signals (143.8~171.775MH2) from the VCO UNIT at 10302, and are converted to 35.8MHz 1st IF signals. ‘ot IF signals are then output from L308. 4-1-4 IF CIRCUIT (RF UNIT) 1st IF signals from the 1st mixer circuit pass through a pair of crystal filters (FI301) to suppress out-of-band signals. After passing through the filter, the 1st IF signals are amplified at IF amplifier Q303 and are fed to, Ic103. FIGOt Is a pair of erystal fiters suppress outot band signals. that ‘The antenna switching clrcult employs | 2 avetype diode switching system, l \ wom] a -fas te eee LH fone L a f alas [Rumtanestwrcom oi, | Lae) Late, €302~C305, D901 and 0202 i t oe The recive gras reconvened © | ol yoo Uae, Catt ane and 5.BMH2 tet IF signals, eae 4-1-5 2nd LO AND 2nd MIXER CIRCUITS (MAIN UNIT) 1C103 contains the 2nd LO circuit, 2nd mixer circuit, limiter amplifier circuit and quadrature detector circuit. ‘The 2nd LO circuit and X101 generate 35.345MHz 2nd LO signals which are used at the 2nd mixer section of Ie103, ‘1st IF signals from the IF circuit are fed to pin 16 of, 1C103, and are mixed with 2nd LO signals for converting the 1st IF signals to 455kHz 2nd IF signals. 15303 ~0306, The 2nd IF signals are output trom pin 3 and pass through ceramic filter (FI101 or FI102) to suppress unwanted heterodyned frequency signals. They are then amplified at 2nd IF amplifiers Q127 and Q118._ In. NAV band mode, CPU IC701 turns Q131 OFF and Q132 ON. D130 and D131 turn OFF. D128 and D129 turn ON. Thus the 2nd IF signals pass through FI101. In COM band mode, the 2nd IF signals pass through F102. Amplified signals from Q148 are detected by D123 and D124 to convert to AF signals.4-1-6 AGC CIRCUIT (MAIN UNIT) When receiving strong signals, the AM detector voltage increases, turning Q126 and Q129 ON. The bias, voltages of Q118, Q127 and C103 decrease as they are divided by R159, R162 and A167. The gain of Q303 and Q301 in the RF stage also decreases. Thus total gal distortion is decreased and protected from When receiving VOR signals, a 30Hz sine wave signal is detected by the AM detector. To prevent the AGC. function from operating with low frequencies, Q121 turns ON and C199 is connected in parallel with C158, 44-7 ANL CIRCUIT (MAIN UNIT) ANL CIRCUIT to pie OF oro A 8 iss 2a oer IN ‘The ANL circuit consists of R151, R152, RIS7, R158, D122 and C184. The detector output from D123 and D124 is applied to the anode of D122 through R151 and R152, The detector output is also applied to the cathode of D122, passing through R158 where it is divided by R158 and R157. When the [ANL] SWITCH Is OFF, the anode voltage of, D122 Is higher than the cathode voltage. D122 is ON. SQUELCH CIRCUIT Wen the DC voltage detected by D117 ‘and D118 reaches the equele | threshold level, 2122 outputs. | stonat When the [ANL] SWITCH is ON, C154 is grounded. Therefore the detector output, including pulses, is only applied to the cathode of D122. The cathode voltage becomes higher than the anode voltage and D122 shuts OFF just at the moment when the pulses are received. The AF signal (excluding pulses) is, then passed through D122 and applied to 0130. 4-1-8 AF CIRCUIT (MAIN UNIT) After being amplified at Q190, the detector output is fed to AF amp IC104 through the VOLUME CONTROL, (R145) and a low-pass filter consisting of 128. 1C:104 drives the speaker with AF output of more than 500mW with an 80 load. ‘The voltage regulator circuit for AF amp 1C104 consists of 0123, 124 and D121. This circuit applies 9V to IC104 pin 6. 4-1-9 SQUELCH CIRCUIT (MAIN UNIT) ‘The 2nd IF signals amplified at Q127 are fed to 1C103 pin 5, They are then amplified at the limiter amplifier ‘section and applied to a quadrature detector circuit in 16103 with x102, ‘The detected signals are output from pin 9 and fed to the active filter section (pin 10) via SQUELCH CON- TROL R179. The active filter section outputs noise ‘components from pin 11. The noise components are then rectified by D117 and D118 and converted to DC. voltage. The DC voltage controls a squeich contro! circuit consisting of Q119 and 122 via Q125. ‘The squelch contro! circuit controls AF mute pre- amplifier Q130 as shown in Fig. 3. D117 and D118 convert no | components to DC voltage. (0125 controls 0122 according to the DC voltage trom D117 and D118, ‘Thie active filter picks up noise components. Fig. 3 4-24-2 TRANSMITTER CIRCUITS 4-24 MICROPHONE AMPLIFIER CIRCUIT (MAIN UNIT) AF signals from the INTERNAL MICROPHONE or from the EXTERNAL MIC JACK are fed to IC101 through R178. R178 adjusts the microphone input level. Output signals from IC101 pin 3 are fed to the modulation circuit (313 on the RF UNIT) through R108 and buffer amplifier Q101. R106 adjusts the modulation signal level. To prevent signal distortion output when the strong signals are input, a portion of the output signals from IC101 pin 3 Is detected by D101 and D102 The detected voltage is fed to the ALC amplifier of 1C101 and the output gain of IC101 is reduced. MICROPHONE AMPLIFIER AND MODULATOR CIRCUITS 4-2-2 MODULATOR AND ALC AMPLIFIER (RF UNIT) In transmit mode, LO signal from VCO UNIT OUT! are output through D307 and an attenuator consisting of R331~R333, and are then applied to gate 1 of Q313, (at approx. OdBm). Q313 amplifies LO signals with ‘@ gain controlled by AF signals to make low level ‘modulation, Output signals from Q313 are fed to the ALC amplifier via an attenuator consisting of R343~R345. Output signals from the modulation circult are ampli- fied at ALC amplifier Q314. The gain is controlled by the ALC circult. 1 / / 1 1 1 fon 1 1 I Dt Fig. 4 4-23 DRIVE AMPLIFIER CIRCUIT (RF UNIT) After being output from Q314, the signals are further, amplified by a drive amplifier consisting of Q315 and 2316. ‘The drive amplifier has a maximum output level of approx. 90dBm (1W PEP). By using troidal colls as matching transformers between these stages, signals over a wide frequency band can be amplified without adjustment. ‘TRANSMITTER RF CIRCUIT 4-2-4 RF POWER AMPLIFIER (RF UNIT) ‘Amplified signals at the drive amplifier are power amplified at RF power amplifier Q317. The RF power amplifier gives stable output power of more than 37.8d8m (6W PEP) between 118 and 136MHz. While transmitting, an antenna switching circuit consisting of Q312, D314 and 0315 Is turned ON and L324 and €304 become parallel resonance circuits to prevent signals being applied to the receiver circuits. Thus the signals are applied to ANTENNA CONNEC: TOR J301 through D314, C395 and the low-pass filter. Le4-3 PLL CIRCUITS 43-1 GENERAL (RF UNIT) The PLL circuits are designed in a way that allows the desired frequency to be generated directly by the VCO without prescaler by using high-speed PLL IC 1C301. The operating frequency capability of 16301 is up to 180MHz. ‘The dividing ratio of the programmable counter and the reference divider Is determined by N-data from the CPU. Nedata Is the number of times the desired frequency Is divided by the reference frequency. The desired frequency is transmit frequency in transmit mode and the 1st LO frequency in receive mode. Nedata—-Desited frequency Reference frequency Signals generated by the oscillator section of 1C301 ‘and X301 are divided by 12 at the divider section of 16301 to obtain 25kH2 as a reference frequency. ‘Output from VCO OUT2s fed to 16301 pin 8 and divided N times at the programmable counter section of IC301. Output signals from the programmable counter are applied to the phase detector section of IC301 and are phase-compared. The output signals of the phase detector are output from 1301 pin 5. The signals pass through a charge pump consisting of (2306~0308 and a lag lead-type loop filter consisting of, PLL CIRCUITS BLOCK DIAGRAM 16901 Is a high-speed PLL IC Including a reference oscillator. R326, R327 and C340. They are then applied to the VCO UNIT as a lock voltage (LV). ‘The output from the charge pump is also used on the receiver bandpass filters via a buffer amplifier consisting of Q309 and @310. 4-3-2 UNLOCK CIRCUIT (RF UNIT) When the PLL circult Is unlocked, pin 7 of 1C301 is “LOW”, turning Q304 and Q305 ON via the time constant circuit (R320 and C334). 304 sends pin 67 of the CPU (IC701) a “LOW” unlocked signal. 4-3-3 VCO CIRCUIT (VCO UNIT) The VCO clrouit (@503) employs a Hartley oscillator clrouit, The VCO freerun frequency is shifted by Inductive reactance with Q506 and D504. In transmit mode, @506 turns OFF then 0504 is reversely biased. Thus L503 is serial connected with L504, As aresult, the free-run frequency is determined by L504, L503, D501 and D502 In receive mode, Q506 turns ON then D504 turns ON. Thus L503 is shorted. As a result, the froerun frequency is shifted higher than the recelve frequency. VCO generated signals are output as OUT! and OUT2. OUT! Is buffer amplified by Q501 and Q502. OUT? is buffer amplified by Q504 and Q505. Bde unr >} senson |My Loic une us ter per This circuit ompioys @ Hartley osetator oor BA oecuaror 1 1 {----4 | Taoeren ole" amet] Site | es ' veo This oop fiter sa lag i hasan oodype. re seer4-4 POWER SUPPLY CIRCUITS 4-41 INTERNAL/EXTERNAL POWER SWITCHING CIRCUIT (MAIN UNIT) When using a battery pack, relay RL101 is OFF and POWER SWITCH R145 is connected to the battery pack (ND. When a power source with voltage 13.2V+10% is, connected to EXTERNAL DC POWER JACK 304, RL101 Is ON and R145 is connected to the external power source. In case a wrong connection to J304 is made with reverse polarity, D106 is reversely biased, preventing L101 from being ON and protecting the transceiver. 4-4-2 VOLTAGE LINES VOLTAGE TAG DESCRIPTION Veo | Passes POWER SWITCH voltage from abatteryor EXT DC power source switched by RL101. ‘Common 6V current amplified by Q110 and +8v_ |a111. Reference voltage made by 1C102 and current amplifier Q116 and 117. ‘Control ine of +55 from the GPU. Normally *5C | thistine sat "LOW". yas | Common SV usedin the VCOUNIT. Current amplified rom +5C by Q112 ‘Control ine of RSS from the GPU. Inrecelve FSC | mode, this ine is at “LOW’ Receive 6V current amplified by Q106 and G107 ros | andoontrolled by REC. Ret by IC102, current amplifies Inverter 103, ‘Control ine of mie amplifier C101 pow: TSC | source. _Intransmit mode, this line is at Transmit 5V current amplified by Q108 and Q109 tom | aNd controlled by MUTE line. Reference voltage ‘made by 1C102, current amplifier Q116 and Q117 and inverter Q104, Tranamitirecelve switching line, 5V in receive SEND | mode andOV in transmit mode made by Q102 using MIC2 or MCON tine. Power source forthe CPU. _4.4V passes through D112 from +5V while POWER SWITCH is ON, or CPUS | approx. 3V passes through D112 of lithium Dackup battery BT101 CPUS LINE mane 1 rege want | Sa 4-43 VOX POWER SOURCE CIRCUIT (RF UNIT) ‘The current limiter circuit consists of Q318, D316, R366, R367 and R368. This circuit has a current limit of maximum SmA and supplies a voltage to the optional HS-10SA VOX UNIT. When the current is overloaded, Q318 reduces the current until the base voltage of Q318 plus Var and the ‘omitter voltage of Q318 are the same. 4-5 LOGIC CIRCUITS (LOGIC UNIT) The main part of the logic circuits is CPU IC701. This includes a 4K-byte ROM, 128-byte RAM and a circuit to drive FREQUENCY DISPLAY DS701. Following are CPU explanations and their 1/0 ports. CPU PORT ALLOCATIONS INPUT PORTS. PORT | PIN NUMBER | NUMBER| DESCRIPTION INT (Ro}_| _47_| Port for VOR reference signals. When the interrupt signatis received the CPU stops operating. When the PLL circuits unlocked, this port becomes “LOW”. These are input ports forthe initial and key matrices. Port for VOR (9860H2) detector Pe2 [So] 72 | signals. When this ports "LOW" the CPU receives VOR signals. Port for VOR phase comparison 3 [Vo] 71 |data. The CPU reads the leading ‘edge of this data. ‘When this port is "HIGH", the LOW BATTERY INDICATOR appear Poorint 0} | 70 og (UL) 67 Pro~Pis | 61~58 P70 [BAT] P71 (saul) When the [PTT] SWITCH Is pushed, this port becomes “HIGH’ a ‘When the [LIGHT] SWITCH ane 51 | pushed, nis port changes from "HIGH" to “LOW” P72 {SEND} | 52‘OUTPUT PORT RESET TIMING CHART 45-1 RESET CIRCUIT (LOGIC UNIT) The reset circuit detects the BVC voltage to reset the cpu. RESET CIRCUIT Fig. 8 PORT] PIN eres eae psontia aca DESCRIPTION a a POTGK] | 68 _ [Por for PLL serial data clock P02 DATA] | 68 [Port for PLL seit data vote Each time the P70{LAMPT] changes to "LOW" fom "HIGH" = thispor atematly outputs at venon rao) | 97 | "uOW ana HtGH Whi this ats \ tl port outputs “HIGH”, the backlight Voltage at forthe FUNCTION DISPLAY is aa imines \ | Por for TKMUTE signals a "1 When the transceiver is changed pein t t P21 [MUTE] 56 from receive to transmit mode, this fH port remains “HIGH” for \ i Spproximately110msee. L Port for T8V control ANCELLATION oF [A+ sor wooe P22 [TSC] 58 ‘When this port outputs “LOW”, ssror MOOE TSV is supplied. Fig. 9 raoyesray | os [PorforsvebesignaisofPitseral! 4. VOR CIRCUIT (VOR UNIT) Por forbeep tone cont When the transceiver ie set In the NAV band (108~ parecer) | 95 | When sport outputs “HIGH 117975MH2), pin 72 of the CPU (IC701) becomes ene : “LOW”, turning 603 ON, then the VOR circuit is Port for +5¥ control. eras Paet+sc) | 63 | Wmentnispon outpute“LOW”, +5V is supplied. Detected signals from the AM detector (D123 and ae D124 on the MAIN UNIT) are. buffer amplified at Perpecrn cial vesenaparcusesrione 10801 (0). Output signals include 90H variable SS is supplies. phase components and S960H2 reference phase Por forLco conto components, uo 2 | When tnePOWER] SWITCH Is {uimed OFF, his port outputs, 20H variable phase components are picked up at ‘HIGH bandpass filter IC601 (C), converted to square wave P41~P43_| 1, 80, 79 | Ports for the initial matrix. ‘signals at comparator 1C604 (B), and are then applied owes | 727% [rons forthe hey mat topin 71 of the CPU as variable signals (Vo) ‘P60 14 Not used. | 9960Hz reference phase components are picked ‘When te AV Band nsalcing, up at bandpass filter 10801 (A). These components P61 [VOR] 73 _| this port outputs" HIGH" are FM modulated with 480Hz deviation and 30Hz modulation. Signals are then amplified to approx. (0~1.8V at limiter amplifier 1C802 (B) and converted to PWM (Pulse Width Modulation) signals at 1C602 (A). The PWM (Pulse Width Modulation) signals are detected at. a low-pass filter consisting of R629, €616, R630 and C619 to obtain a 3OHz reference phase signal. The 30Hz signals are amplified at 10603 (A), passed through bandpass filter IC603 (8), converted to square wave signals at comparator 10604 (A), and are then applied to pin 47 of the CPU as reference signals (Ro). A portion of output from 1C601 (A) is amplified at Q601 and detected at D602. When the VOR signal is received Q602 is tumed ON and the CPU receives a “LOW" to display the VOR INDICATORS. 1C601 (B) applies the bias voltage fixed by R618, R619 and C612 to each IC.VoR ciRCUIT mploys @ : ee i ‘aren ry ie tee 4-7 OTHER CIRCUITS 4-7-1 LAMP CIRCUIT (MAIN AND LOGIC UNITS) The lamp clrcult consists of Q115, D115 and other ‘components and drives backlights 0S702 and DS703,, ensuring that brightness does not change even with a change of power voltage. $102 controls Q120 through the CPU. When Q120 Is turned ON current flows into R128, resulting in the base voltage of Q115 being approximately Veo =1.2V as determined by D115. The emitter voltage of Q115 is then Voc —0.6V and the voltage at both ends of R127 Is kept constant. The result is a constant current even with a change of, power supply voltage. 4-7-2 BEEP CIRCUIT (MAIN UNIT) This is a phase shift oscillator consisting of R122~ R125, C120~C122 and Q113. The circuit oscillates when the cathode of D113 becomes “HIGH”. The oscillating frequency is set at approximately 2500Hz. 4-7-3 TRANSMIT/RECEIVE SWITCHING CIRCUIT (MAIN UNIT) When the PTT SWITCH is pushed, Q102 turns ON. the CPU and the base Q108 then turns ON ‘and is activated. After 110msec., pin 56 (MUTE line) of the CPU becomes “LOW”, and then 5V Is applied to the base of 108 via Q104. ‘When the PTT SWITCH is released, Q102 turns OFF. After 12msec., pin 62 (RSC line) of the CPU becomes “LOW", and then 5V is applied to the base of Q106 via 2103. 4-7-4 REDUCED VOLTAGE DETECTING CIRCUIT ‘The reduced voltage detecting circuit consists of Ic702 (F), 0701, R703 and R727. BVC passes through Voc R131, Is divided at A703, and R727, and is then applied to pin 13 of 1C702 (F). If the voltage of 1C702 (F) pin 13 decreases to less than 2.2V, the output voltage at pin 12 Is “HIGH”. This Information is fed to the CPU, causing the LOW BATTERY INDICATOR to appear on the FUNCTION DISPLAY. Thus, if the output voltage of the BATTERY PACK decreases to less than 10.8V, this function is activated. REDUCED VOLTAGE DETECTING CIRCUITTION 5 MECHANIC. 5-1 CASE DISASSEMBLY 1, Tum the POWER SWITCH OFF and remove the battery pack. 2, Remove the screw @ and the 4 screws ® on the rear panel and the 4 screws © on the bottom as shown in Fig. 5-1-4 RTS AND DISASSEMBL os Sliding guide car751) —— Panhead screw ° M2x42K pO Settapping stews AO 2x15 2K Battery pack latch, (42547) Release button NZ © Fathead screws waexe Ni Fig. 51-1 3, Remove the rear panel as shown in Fig. 5-1-2 ‘562 Front panel-t (20284)4, Slide the Inner frame upward slightly as shown in Fig. 51-3. 5. Lift the frame away from the front panel. Be careful not to damage the flexible board. 6. Remove the 2 knobs on the top panel (VOLUME and SQUELCH) and push IN the ANL and HIGH/LOW SWITCHES. 562 rear shielding Soe pater 562 grounding plate (43770) Fig. 54-4 Knob (VOL) N76 Knob (SQL) N76 Connector (ANT) BNC-RM-106 Button (orange) KOR oon —f Variable resistor (SQL) —}— KO9411 1000NA 10KB Variable resistor (VOL) RKO9411110034 10KA Fg. 54-57. Remove the 4 screws on the sides of the chassis, and open the chassis as shown in Fig. 5-1-6 and Fig. 5-1-7. * A Flathead screws ‘ Moxa Fig. 54.8 Fig. 54-7 5-2 TOP PANEL DISASSEMBLY 1. Remove the screw ®. 2. Remove the BNC nut and the BNC washer. 3, Remove the ANTENNA CONNECTOR by unsoldering point @ on the components side and point © on the foil side of the RF UNIT. (Fig. 5-2-1) 4, Remove the top pat ‘See Fig. 5-2-2 below. Be careful not to break the tabs | by slightly prying outward both side tabs (points ©) of the top panel. 7 Panhead screw M2x4 ZK ——Tor pane! (30956) Fig. 821 ‘Connector (ANT) BNC-RM-108 sssem BNC washer anc nut5-3 PA AND EXTERNAL JACK DISASSEMBLY 1. Unsolder points ® to remove the VCO shielding plate. (Fig. 5-3-2) 2. To remove the heatsink unscrew and remove the screw ® then unsolder solder point © on the components side ‘and solder point © on the foil side of the RF UNIT. Connector (EXT. MIC) 4sJ1102.01-040 ‘Connector (EXT. DC) HECo747-01-010 ~@ ICOM screw we Connector (EXT. SP) H180836-01-010, Heatsink (42829 Solder point © Solder point @—— +-+1vo0 shieising Plate (43771) a e Fig. 53-4 Fig. 532 5-4 SPEAKER AND MICROPHONE DISASSEMBLY 4, Remove the 3 screws @ and the speaker plate as shown in Fig. 5-4-1. 0 sotttapping screws 0 24 ‘562 Speaker plate (43709) Microphone. —Speaker KUc-2023.01-006 ; 40P-1778 Microphone: holder (2541)5:5 PTT SEAL DISASSEMBLY 1. Remove the 2 screws @ and the PTT plate as shown in Fig. 5-5-1. PTT plate ll (42546) —. PTT seal (A) 42537) © Fiat filistor nead serews M2x5 ZK |+_—s62 Front panel 20284) gl Fig. 554 5-6 UNIT BOTTOM DISASSEMBLY 4. Unsolder solder points @ to remove the screw lugs. Unsolder solder point © to remove thi contact for @ short time to avoid damaging the contact holder. 2. Remove the 2 screws © and the contact holder as shown in Fig. 5-6-2. Solder point © Solder points @ Fig. 564 +—screw lug M26 (42260) P.C. Board 008 E ting = => sean 2 42240) om HA = comet nooo " ease § | bo Parmend screw laussie (©—+—Plate washer (F) (42249) B——sorina ars wares js Fig. 562SECTION 6 ADJUSTMENT PROCEDURES 6-1 PLL ADJUSTMENT TEST INSTRUMENTS REQUIRED MEASUREMENT CONNECTION LOCATION (1) AC POWER SUPPLY © Output voltage 2 13.2V OC AC POWER FREQUENCY * Current capacity: 2A or more ‘SUPPLY COUNTE! (2) FREQUENCY COUNTER to EXT. DC “— 1ouF CAPACITOR requency range =: 0.1~180MHz POWER JACK to fa07 * Frequency accuracy : +1ppm or better * Sensitivity : 100mV or better TRANSCEIVER DC VOLTMETI (8) OC VOLTMETER * Input impedance — : 50kQ/DC or better 10 R327 ADJUSTMENT MEASUREMENT POINT ADJUSTMENT ADJUSTMENT CONDITIONS VALUE UNIT LOCATION UNIT | ADJUST * Frequency display: 135.975 MHz RF Connect the DC vco L504 «Connect a 500 dummy load to the voltmeter to R327. ANTENNA CONNECTOR. * Receive mode * Transmit mode 6.5V REFERENCE * Frequency display: 108.00 MHz Connect the 143.800MHz FREQUENCY * Receive mode frequency counter to the cathode of D307. VCO AND RF UNIT D307 Reference Frequency Check Point Lock Voltage Adjustment —; R327 Lock Voltage Check Paint 6336 Reference Frequency Adjustment6-2 RECEIVER ADJUSTMENT [ TEST INSTRUMENTS REQUIRED MEASUREMENT CONNECTION LOCATION (1) AC POWER SUPPLY + Output voltage: 13.2 06 “Current capacity: 2A or more Ac MILL VoUTMETER {@ STANDARD SIGNAL GENERATOR ($86) [se ‘Frequency range: 0.1~180MHz Ceo Ls * Output evel =127~—1748m SCOPE. (o1uv~semvy ‘STANDARD ‘AG POWER SIGNAL (6) AC MILLIVOLTMETER Supevy to XT. SP JACK GENERATOR Measuring range: 10mV~10V (@) EXTERNAL SPEAKER weer. 06 fe ANTENA POWER JACK. CONNECTOR + impedance 80 ‘TRANSCEIVER (6) OSCILLOSCOPE ‘Frequency range: DO~20MHz + Measuring range: 0.01~10V MEASUREMENT ere POINT ‘ADJUSTMENT | ADJUSTMENT CONDITIONS VALUE unit | LocaTion unit | Aovust sens — | 1 | «Frequency display: 127.026MHz | TOP [Connect the AC |Max. audio output | RF | La01 rity + Receive mode PANEL | mil-voltmeter with 02 ANU SWITCH: OFF an 80 load to the 03 + SQUELCH CONTROL: Max. CW EXT. SP JACK, Lo04 ‘Apply an RF signal to the 305 ANTENNA CONNECTOR Level: —107d8m (1n¥) Mod. : 1KH2/30%/AM + Each coil has two peak points that must be adjusted as follows: apt 1902 L3G8 L306 L905 Lo01~L304: upperside peak point Laos: lower side peak point NOTE: Repeat above adjustment several times. IF FILTER | 1 | Apply an AF signal to the oP |Connest the AC [Max audio output | AF | L306 ANTENNA CONNECTOR. PANEL | milltvoltmeter with sor Level: ~8748m @.2u¥) {an 80 load to the Mod. 1kH2/30%6/AM EXT. SP JACK, tramp — | 1 | «Apply an RF signal to the ‘Top | Connect the Max. audio output. | MAIN | L101 ANTENNA CONNECTOR. PANEL | oscilloscope with Level: ~ 478m (1m¥) ‘an 80 load to the Mod. : 1kH2/30%/AM EXT. SP JACK, (GW: ClockwiseRF UNIT Sensitivity Adjustment IF Filter Adjustment MAIN UNIT L101 IF Amp Adjustment6-3 TRANSMITTER ADJUSTMENT TEST INSTRUMENTS REQUIRED MEASUREMENT CONNECTION LOCATION (1) AC POWER SUPPLY * Output voltage: 132V D0 oF onion “Current capacity: 2A or more GENERATOR INALYZER (2) RF POWER METER (TERMINATED TYPE) ow! Measuring range: 1~10W ‘AG MILL ATTENUATOR, + Frequency range: 100~140MHz Soueien ‘more than + impedance 500 woe woe + SWR Less than 1 0 snore Re POWER (@) AWMETER Soren T_Lwerer * Measurement capability SUPPLY an 200mA : CONNECTOR 4) AF GENERATOR (AG) oo. 0 ‘ Frequency range: 200~2000Hz FOMen shee. ‘TRANSCENER + Output level :0~200mV (6) AC MILLLVOLTMETER, ‘Measuring range: 2~200mV ao etait (6 MODULATION ANALYZER ‘ Frequency minimum : 180MHE + Measuring range: 0~100% MEASUREMENT ay ADJUSTMENT | ADJUSTMENT CONDITIONS VALUE unit | Location unit | apsust tuna — | 1 | «Frequency aisp RF | Connect the oma RF | R360 cuRRENT | | +Unsolder land between C368 and ammeter to 4905. @ For diver L313. Gee p. 85) transistor || Unplug P01 and Pa02. + R360, ROB1: Mex. CW + R370: Max. CCW oe *Connect a jumper wire between l@tortina | 2 | F330 and GNo. ‘Connect the 100mA Fab transistor |” | « RF OUTPUT POWER SWITCH: ammeter to 4308. Hig ‘Transmit mode NOTE: After above adjustments, turn POWER SWITCH OFF. Re-plug P301 and P302 into 14808 and J308 respectively, and resolder land between C389 and L313. Remove the jumper wire trom R330. cannien | 1 |+Frequency display: 127.00MHz | TOP | Connect te RF | 1.6w RF | R370 POWER “RE OUTPUT POWER SWITCH: | PANEL | power meter to the High ANTENNA +370: Max. COW ‘CONNECTOR. ‘Apply no AF signal to the EXT. MIC JACK, ‘Tranamit mode 2 | «Frequency display: 118.00MH2 1i~1ew verity + Frequency display: 135.975MH2 NOTE: If the output power drops under 1.1W in above verification 2, adjust R370 again up to 1.4W. ‘GW: Clockwise COW: CounterclockwiseRF UNIT P301/J305 Idling Current P302/J306 Idling Current (Driver Transistor) Check Point (Final Transistor) Check Point g 8) Ammeter Ammeter oo] J305 R360 Idling Current. (Driver Transistor) Adjustment final Tatatcien Adlisiment SN ee creeeeang F370 Carrier Power Adjustment R330 Idling Current Presetting to GND (Chassis) idling current adjustment FOIL SIDETRANSMITTER ADJUSTMENT (CONTINUED) ADJUSTMENT ADJUSTMENT CONDITIONS. MEASUREMENT LOCATION MODULATION | 1 | * Frequency display: 127.00 MHz R178, R106: Center * Apply an AF signal to the EXT. MIC JACK: 1kHz, 150mV. ° Transmit mode 2 | «Apply an AF signal to the EXT. MIG JACK: 1 kHz, 15mV. (20dB down) 3 | *Apply an AF signal to the EXT. MIC JACK: 1 kHz, 150mV. TOP | Connect the PANEL | modulation analyzer to the ANTENNA CONNECTOR through an attenuator. ADJUSTMENT POINT ADJUST 90% MAIN R106 33% R178 85~95 % Verity NOTE: If modulation level is not within 85~95%, adjust step 1 again. MAIN UNIT Modulation Adjustment6-4 VOR ADJUSTMENT TEST INSTRUMENTS REQUIRED (1) AC POWER SUPPLY * Output voltage * Current capacity (2) STANDARD SIGNAL GENERATOR (SSG) * VOR bearing function included. 2 13.2V DC : 2A or more * Frequency range 2 O.1~180MHz * Output level 1 —127dBm~-—17dBm (0.1 pb¥~32mY) ADJUSTMENT ADJUSTMENT CONDITIONS MEASUREMENT CONNECTION LOCATION STANDARD SIGNAL GENERATOR ACG POWER SUPPLY to EXT. OC POWER JACK to ANTENNA ‘CONNECTOR TRANSCEIVER ADJUSTMENT BEARING SET 1 | © Frequency display: 113.00MHz ° Receive mode * ANL SWITCH: OFF * SQUELCH CONTROL: Max. CW Apply an RF signal to the ANTENNA CONNECTOR. Level: —60dBm (0.22m\) Ref. Mod.: 30% Ver. Mod.: 30% Bearing : From 90° OFF FLAG * Apply an RF signal to the ANTENNA CONNECTOR. Level + =90d8m (7.1uV) Ref. Mod.: 15% Ver. Mod.: 30% CW: Clockwise VOR UNIT R636 Off Flag Adjustment MEASUREMENT POINT VALUE UNIT LOCATION UNIT | ADJUST FRONT | FUNCTION “FROM” VOR PANEL | DISPLAY FRONT | FUNCTION PANEL | DISPLAY “990°” Adjust to a point just | VOR R636 after VOR indicators appear. R630 Bearing Set Adjustment NOTE: For complete part numbers, “600” must be added to each binary numeral on the VOR UNIT.SECTION 7 BOARD LAYOU 7-1 INTERCONNECTIONS ' 1 [Funct ton \ eine ' \ fee) 2 : + Mig besl-J sere) VOR UNIT ca i t fr] LOGIC UNIT [a8 t : eee, a | emren | Ff Fa omseee. FS ae i | A Be aei|od | iT Fee] ee 1 ereaa t un | 1 [ereaano. eso i brr. 3 ' (re ' 2 ! qiexreRwaT| fexremwac] [EXTERNAL] [antenna Segate™ | [mac aac | [°CEOWER) {connector suntron || SiS | i ea | | | ~ ms CONTRO mins owen SurTeH wire suite RF UNIT MAIN UNIT aaa (Bia6oc) Cert) 4 [so eT q Vco UNIT qi (314638) H qi | | ye BATTERY TERMINAL (3908)7-2 LOGIC UNIT PD7S14Q-307-12 1C701 (cpu PD4089UB 1C702 (HEX INVERTER)° LOGIC UNIT COMPONENTS SIDEFOIL SIDE ws ete ase couecron cou Jeoueeren ewer femme fart ‘Symbol: LY Symbal: SY ‘Symbol: BL RDG.2M Bi MA159 188190 185184 O701 D702, D704, D705 0703, D708, D713 o711 D706, D707 ‘Symbol: 621 Symbol; M1A Symbol: E3 Symbol: A37-3 VOR UNIT NJMB403AM 10801 (QUAD OPERATIONAL AMPLIFIER) BASOG3F 10602, 10604 (QUAL COMPARATOR) wPCas8a 10803, (QUAL DRIVER) EL 4 iI Hi i ig. : A iE° VOR UNIT NOTE: For complete part numbers, ‘‘600" must be added to each binary numeral on the VOR UNIT. COMPONENTS SIDE 10 cosre UNIT 2802712 RN1404 RN2403 188193 Q601 Q602 Q603 D601, D602 nse ease easel qc eouLecron oauuectOR coKLEcTOR rie one ure q Symbol: LY Symbol: XD ‘Symbol: ¥C ‘Symbol: F3.FOIL SIDE7-4 MAIN UNIT UPCIISBHA2 IC101 $81250HG 1C102 (WIC AMPLIFIER) (CMOS VOLTAGE REGULATOR} ‘Tx10420 1¢109 LMaeen 1c104 (FM IF I) (AUDIO POWER AMPLIFIER) a 2scause 2saso48 25aio4s 2scs209 01, Gtoe, aroe G02, 2116 G03, 04 G08, 120,122 arstanss 110, 9113, 0117 G19, a124, 0125, 2126, 0128,0129 Aad Aad 2SB000m 2Sa1a8 9107, a109, 0111, ane ais, a123 prcwars ara, a182 fw ® 251366 2502080 ai ania.arer Be AOe MAIN UNIT [ee ourPuT] POWER SQUELCH CONTROL | Re UNIT7-5 RF AND VCO UNITS PLL2001 10901 (PLL SYNTHESIZER IC) TEE ee ee* RF UNIT 2802668 Q301, Q303 aad canton . ¢ — gS ~ er BiEeron suite e 2SK241 Q302 ° \.. e aa a ! 28C3399 Q304, Q306, Q308 9 2SA1048 Q305, Q310, 318 : eu £) 2SA1345 Q307 A OD 2SC2458 Q309, Q312 ‘ CS on © 2SK74M 0313, Q314 Woosbnir (B1963.4° VCO UNIT AN SS % e a eere 2801972 Q317 ; . ea TA. @ “ warren 28C3772 2SK210 Q501, Q502, Q504 Q503 505 7 i symbol: LYS Symbol: YY DTC124EK Q506 - oo Symbol: 25SECTION 8 VOLTAGE DIAGRAMS 8-1 LOGIC UNIT LOGIC UNIT8-2 VOR UNIT8-4 RF AND VCO UNITSSECTION 9 7 GI Ee aoe [LOGIC UNIT] [Logic UNIT] REF.NO. | DESCRIPTION PART NO. REF.NO. | DESCRIPTION PART NO. term | 1c wPO75146-907-12 cris | Monolithic 470pF © GRMAO ioro2 | 1c Po4089U86 718 | Monolithic 4709F © GRMAD riz | Monolithic 100pF © GRMAD a7: | Transistor asca7i2 ¥ a702 | Transistor 28A1162 Y ps7 | Leo Lr2172M a704 | Transistor 2SA1361 8702 | Lamp HRS-72198-G40 s7o3_| Lamp HRS-72194-G40 oro ‘AD6.2M Br Droz Mats sp7o1 | Speaker 40P-1778 0703 188190 708 Marsa 0705 Mats. ep7o1 | Microphone KUC.20290.008 D706 Mats epr02 | P.C, Board Beasac ror MAIS ep703 | FRC.Board = B1484A 0708 188100 ort asst6t orig 185190 wror | wre av04re6orwo1Mwo1 wre | Wire ‘2avooros0wo1 MoI wros | Wire 2avoarrosiwo1Awo1 x701 oses4so2 wroe | Wire avg7rroWo1 Wot wros | Wire 2avooro8aw01Wo1 rot | chip 100K MCRIO R702 | Chip 22K MCRIO 70a | Chip 42k MCRIO. roe | Chip 2x MCRIO 70s | Chip ‘60k MCRIO R706 | Chip 220k MORO ror | Chip 100K MORIO. [VOR UNIT] R708 | Chip Ka -MCRIO R709 56k. MCRIO REF,NO, | DESCRIPTION PART NO. nro | Chip ‘100K = MCRIO anit | chip 33kQ—-MCRIO oar | ic NUMB403AM pn2 | chip ‘ook = MCRIO toso2 | 1c BABIOGF R73, | chip 4k MCRIO toss | Ic P3566 ria | Chip 47k MCRIO tose | 1c BABOOGE R75 | Chip 47k MCRIO R76 | chip 47k MCRIO riz | Chip 270K MCRIO e601 | Transistor ascari2y R718 | Chip 270K MCRIO 602 | Transistor RNt404 R719 | Chip 30K MCRIO 9603. | Transistor RN2403 ra | Chip 100K = MCRIO rev | Chip ook MCRIO rea | Chip ama MORI sor | Diode 1s8109 rae | Chip 10K MCRIO. 602 | Diode 185189 ras | Chip ‘60K MCRIO 72s | Chip 100K MCRIO. rar | Chip 10k MORIO. eos | chip 300K MCRIO ras | Chip 100K MCRIO. 60s | Chip 33k MCRIO. R729 | chip ook —MCRIO eos | Chip ek MCRIO R790 | chip 100k MORTO Reo7 | Chip 390K MCRIO 7st | Chip 100k = MCRIO R613 | Chip 100K MCRIO. R615 | Chip 12k MCRIO. eis | Chip 2K MCRIO e701} Monoiithie ome GRMAO F Rei | Chip aK = MCRIO c702 | Monolithic OF GRAD F Reis | Chip san MERTO G703 | Monolithic O1uF GRMAO F R618 | chip 18k MCRTO C708 | Monolithic o.001uF —GRMAO R623 | Chip 30k = MCRIO ¢705 | Monoitthie 33pF GRMAO raze | Chip ana MORO e708 | Ceramic ‘S70 SOV ‘R625 | Chip so MCRIO c707 | Monolithic Dor GRMAO F pez | Chip ook = MCRTO c708— | Monotitie seopF = GRMAO Reve | Chip 4m MCRIO ces | Monotithie eopF_—GRMAO R829 | Chip 220 MCRIO 710 | Monotitie L001 GAMO R830 | Trimmer 470‘ RHOAASASAJ cr Monolithic 1o0pF —-GAMAO reat | Chip 220K MCRIO riz | Monolithic ‘00pF © GRMA0 es | Chip 820k = MCRIO ria | Monolithic 4TOpF — GRMAD Rese | Chip 68k2—-MCRIO cri¢ | Monolithic 4T0pF — GRMAD Rese | Chip 15k. MAIOIVOR UNIT] IMAIN UNIT] neF.No. | DESCRIPTION PART NO. REF.NO. | DESCRIPTION PART NO. 635 | Onin 300k MCRIO r20 | Transistor 2802458 GR e268 | Trimmer 47k —_RHOMAGASAS rao | Transistor = 2802458 GA pear | Trimmer Tk RHOMASATON air | Transistor 3008 638 | chip 390k MERIO. aise | transistor TT46 TS rex | cn yaa) MCRIO isa | Transistor 2503900 coor | Chip tantalum wr tev sv ior | diode iss211 C002 | Monoittic—O0omMF GAMA pio | ode 185211 Geor | Chiptantaum — t0uF” 16 SV 103 | Diode sss21t 00s | Chip Tantalum OF TESVATVi0¢Kr ioe | dlove 1ss211 Ge0e | Chip Tantalum O.MF —_TESVATVIOGKT-. 10s | iode 188211 009 | Chip Tantalum tur i8V BV 108 | Diode 188211 C610 | Monat 0001 GRMAO Dior | Diode 1ss211 Cor | Monoiithic ——O00THF AMA ioe | dioee isszit Co12 | ChpTanteum uF tev SV bie | lode 185253 Gera | Chip Tantakim Our 1B BV oa | diode 1ss211 co15 | Monolitic aor RMD ons | diove 188227 Core | Chip Tanteum Our TESVATVIO4K184, ons | diode 88211 coi7 | Monolithic = OCtuF GRMAO F on7 | oleae iss211 core | Monolinic Our GRMAO F one | diode 188211 C618 | Chip Tantalum 022uF —TESVATVZz4Kt-SL po | dlede isszit co20 | ChiptTantaum tur 18 SV 120 | oiede sss211 sat | ChipTantaum Our 16 BV Dia | Zener FOBSE 83 Geez | Chip Tantalum —022uF —TESVATVZ24Kr-L, Di | diode 88211 oz | Chip Tantekim —O22uF —TESVATV224K1.8. 123 | Diode 15500 Die | Dloge 18508 128 | Diode 189216 eco | Pc. Board 4500 oi2a | Diode 155216 ps2 | FC Board BNA7BA D190 | Diode 185216 pit | Diode 185216 rot | Ceramic crumasse Fii02 | Ceramic cruMAs80 IMAIN UNIT] xior | neta caro x02 | Diacrminator —_COBABETA ReF.NO. | DESCRIPTION PART NO. vcror | 1c UPCHSOHAD tor | coi s.209 iow | 1c 125016 vows | 1c e30420 tre | 1c Ua96N3 riot sun LAO woe 12k ELRIO m0 2x2 ELRIO 10: | Transistor «2802488 GR ioe zon ELA 102 | Transistor 25a1048 GR ios 2x ELRYO 10s | Transistor 25A1345 108 Tora —-RHOSa1C14L08A 104 2SA1345 ior ina ELRIO 10s 2503308 ioe coo ELRVO ‘108 asc2ass GA 00 ‘sor ELRIO our 2580000 Riv ano ELRIO ‘owe 2502480 OR at 12k ELRIO 108 2580000 are ama 0 eno 2502488 GR ats, fora ELRIO ant 258000" R are 12 ELRIO ane 2sa1340 ais 220K ELRIO ans 2502488 GA ane oro ELRIO ana 25A1346 an zaxo—ELRIO ans 2580000 Rue fom ELRIO on 25A1048 GR ans ok ELATO on7 2502488 GR R21 ano -ELRIO ane 25c2s68 0 Riza Wako ELRIO ano 2502480 GR Riz Tako ELRIO 120 2503900 Rize two ELRIO anzi Drove Ts R25 cao RO onze 2503309 R28 2x ELRIO ans 2580004 R R27 47a era onze 7502458 GR R28 sexo Ra ars sczusa GR R29 xo ELRIO ars 2502488 GR 30 tok ELRIO arr 12802868 0 Rist am‘ ELRIO ars 2802458 OR raz | Resistor {ok __-ELRIO[MAIN UNIT] [MAIN UNIT] REF.NO. | DESCRIPTION PART NO. REF.NO, | DESCRIPTION PART NO. miss | Resistor sek ‘ELAIO crs | electronic aur av MSS. Rise | Resistor 150k RI crs | Coramie Ooowr SOV 35 | Resistor 90k -ELRIO cre | Ceramic Door ov frt26 | Resistor Beko ELRIO Ceramic Doom SOV atsr | Resistor aq ELANO Caramic 00m Sov fa1s8 | Resistor 33k LATO Eloctotjlc ATF 8.3V MSS Rut | Resistor 4a FO Barter Layer — O.00TB AF 28 Ruz — | Resistor sara ceramic O00 ov 43 | Resistor an) Barer Layer O.0030uF 25 is | Resistor 180k ELRIO Parle Layer OOF 25 Rts | Variable Resistor YOKMA —-RKODA1110058 ciza | caramio oor Ov 146 | Resistor sk -ELRIO Gis | Electrolytic = 2auF VSS aur | Resistor sox LALO cia | coramio s70pF OY ras | Resistor ana ELRIO C127 | Electrolytic © uF VSS aus | Resistor 47K iz | Glectomle © 22UF_ = BVM iso | Resistor ek ELAIO cr20 | Ceramic ‘oowe SOV ist | Resistor 100K ELATO 6130 | coramie Doom sov sz | Resistor sok ELAIO cra | cloctoiyie == 2a BSS ise | Resistor aK ELAN e132 | Coramie 2p OV iss | Resistor toon ELATO 133 | Barrier Layer O01uF_ a5 ise | Resistor ana ELAN Gia | Baror Layer 00ATUF 25v is7 | Resistor 100K ELATO 138 | ceramic 00mF SOV isa | Resistor 220K ELRIO 198 | oramic Ser SO iso | Resistor 470 ELAN e137 | coramic O0ome Sov igo | Resistor 1502 IO 138 | Coram 00m SOV isi | Resistor ko ELAIO cro | Coram 00m Sov isz | Resistor 33k0—ELRIO rar | Barron Layer a.00saF 25 ise | Resistor 450k ELRIO cre | Coramie o.00mF Sov ies | Resistor 22k ELAIO ora | Covamic .00mF SO Rie? | Resistor 5K -ELRIO C144 | Electroytic © Y00F tv MST ies | Resistor 3a ELRIO M5 | Coramie s00pF sv ico | esistor ook ELRIO 14s | Coramie i00pF SOV rir | Resistor 150K ELRIO cr? | Tantalum tur 35V ON rz | Resistor 200 ELAIO C148 | Electrolytic © SUF TOV MSS, iz | Resistor 1k —-ELRIO cro | Electotyic «OATES MSS, irs | Resistor ana ELAIO iso | Electoiic = T0uF TV MSS, nr7s | Resistor oko ELRIO cist | Electronic = uF SOV MSS, R175 | Resistor 270 ELAN ors2 | Ceramic oom ov 76 | Resistor oon ELANO 183 | Ceramic Doom SOV air | Resistor ska ELRIO cist | Electric OzaF SOV MSS R178 | Trimmer 22k RHOSZ10334054 crs | Eloctouic © 22uF SOV MSS, R170 | Variable Resistor YOK AKODEI7000NA 6186 | Barrier Layer O00z7F 28 120 | Resistor 47a LAO crs7 | Barrer Lay Oooa7uF 25v nisi | Resistor ok ELAIO cis | eloctroitle = OTE Sov MSS rez | Resistor 33k ELRIO 159 | Covamie sTOpF_ OV ries | Resistor 2a ELAIO 160 | coramic Ooome Sov ries — | Resistor aka ELAIO 16 | Coramic O00mF SOV ras | Resistor son ELRIO 162 | Coram 220F Sov Ries | Resistor ano ELRIO e163 | Coramic OoowF Sov igs | Resistor 22k0—ELRIO 16 | Baer Layer OOF 25v igo | Resistor 00K ELATO 10s | Ceramic oor SOV R90 | Resistor za ELRIO e108 | Coramic .00mF SOV isi | Resistor ana ELRIO 187 | Electric «ATH 18S isz | Resistor waka ELATO Stes | Electioytic > tou OV MSS, iss | Resistor ko ELRIO creo | Barrer Layer otra Rise | Resistor ko ELRIO e170 | Coramic O0omF SOV 19 | Resistor van ELRIO ert | Coram 29F SOV ise | Resistor yak ELRIO cre | Covamie Spr SOV ris? | Resistor ko ELRIO 173 | Monolithic OTMF_——_SGYSVIE t04z21 ri0g | Resistor 470 ELRIO 17s | Coramic Bor SV 175 | Barter Layer OTF 28 x76 | Tantalum ECSFOJEIOS 101 | cara s70pF Ov 177 | Monolithic Dsavsvie toazet 102 | Tantalum Our BV ON cra | Ceramic sv 103 | Electronic © ATAF_ = 18V_ MSS 179 | Coramie sv cto | Electric © WF SOY MSS. 120 | Electrortc rey Mss 105 amr tev MSS crt | lectoitic sv MSS, 108 OF Sov MSs cree | ceramic sov ctor | Electoitic © ATF «18S. ras | Barrier Lay 25v cis | Electric «= tu SOV. MSS. e105 | Electroiie Sev Mss cra | Electoiic oF B3V_ MSS c1e7 | Becton toy M85 Gro | Electotic TOUTS 618s | Barrer Layer av crt | Electric =a 8.8 SS cro | electeiye oF SoS, cr | Electotic © uF SOV MSS 190 o.00K7uF 25V crs | Electoiic ATF 8.3 MSS erst O.00K7HF 25vIMAIN UNIT] IRF UNIT] REFNO, | DESCRIPTION PART NO. REFNO. | DESCRIPTION PART NO. cio | Ceramic 001 Sov aot | varcap 1Sv155| 195 | Electronic |= au BMS 002 | vareap 18V155, ci | Ceramic ATF OV 909 | Vareap ssviss cio | Ceramic spr SOV aoe | Varcap 18vi59 e198 | Ceramic aig SOV 30s | Varoap 1sviss e109 | Electoytc = 0uF_— TOV ae | Zener 08 2 69 0307 | Diogo 185216 008 | Diese 185216 rior | olay ovess:1140 a0 | Diece 1a ps0 | Diese 18053 oats | Dioge 18059 sior | switen SKHHAKOISA (OTT) ca | diode 18807 sic | Switch SKHHAKOIOA (LIGHT) p19 | Diode 18807 5103 | Switch SKHHAKOTSA (FUNG) pow | diode 185216 sioe | Switon SPPHZ2OA pais | Diowe 185216 {fe OUTPUT PoweR pore | dioge 85211 5105 | switen [SPPH220144 (ANL) pai | diode sss211 riot | uthium Battery eRza25-1H0, root | est FL99 95208 Eior | Forte seas RE DL20F2651.2H x0 | cyst 760 Epioz | Femite Sead RE DLZOP26S1.24 Epi | P.6. Boars = 14800 eit | PC. Board 8008 voor | con Lp.170 eros | FC. Boers Bat tov | ait iB70 a0 | cout tore tao | cout tere wior | Wire 2ana/t98020W01 305 | ait tie wiz | Wire 2zavartso2iwot L208 | coi tans wios | Wire Tasens0 x90 taor | coi tsa13 wior | Wire Taenso xeex08 tae | coi ALON 48K wos | wi zavo2si2v021 09 | oi LALOONA 4A wor | Wire za naoesD21G0216 tao | coi taza wee | Wire zansce0216/021 tr | coi LALOONA 22M wrio | Wire sirgodowoawoe tz | coi ates Wrz | Shieiscable —easaroowtAwis tas | coi LALOONA 2R2M wis 8 tae | oi Leo wre | Wire ‘vnarost02160021 ait Las wis | dumper sPwo1 OT on unis wie | Wire Taaraxcence Col ure Cait niet ait uns ait une Coit tres coi ar cal ALGONA ARIK coil taasr IRF UNIT] Coit ane coi tase REFNO. | DESCRIPTION PART NO. ait LALGENA 3F0 rear | tc PuLzoor osistor zoo LR 220K ELAYO cos01 | Transistor 2802668.0 amo ELAYO ‘as02 25Kzat amo LR oats 2502868 0 oon LATO 04 2503900 wo ELRIO 3305, 25A1048 GA Resistor zon LAI 06 2503900 Resistor za ELRIO aor 25A1346 Resistor 22K ELRIO ‘308 2303000 Resistor sq. ELRIO ‘2300 | Transistor 252458 GR Resistor 220 ELRIO aio | Transistor —sa1048 GR Resistor soa ELRYO astz | Transistor 252458 GR Resistor jon. ELRIO oss | Fer S9kraM Resistor soo ELRIO cow | Fer ssKraM Resistor ia” ELAIO Gis | Transator ——_-252407AW Resistor za ELRIO sts | Transitor —a8c1047 Resistor toon to carr | Transistor = ascior2 Resistor zn ELRIO oe 25Ai048 GR Resistor 470K ELAIO Resistor a7 ELAO Resistor 2no— ELAIO[RF UNIT] IRF UNIT] ReF.No. | DESCRIPTION PART NO. REF.NO. | DESCRIPTION PART NO. ra23 | Resistor sexo ELRIO ‘cazs | Tentaum 22yF_-38V_ON raze | Resistor tot ELRID ca | Caramie oor Sov 2s | Resistor ska ELA cazs | Oaramic oor Sov 25 | Resistor ama ELRIO cxz0 | Barrer Layer O00K7uF 25 oar | Resistor 240 RIO cas | Cavamie oor SOV aes | Resistor jon ELRIO car | Garam ooo1r Sov 2a | Resistor ama ELRYO Geez | Eloctoyte © A7uF 6a M5 00 | Resistor soa casa | Bamior ayer Oot 28 Rast | Resistor eon ELRIO Gee | Eloctovte tur SOV M8 rose | Resistor mo RIO. cass | Gavamie 00F SOV ass | Resistor eon ELATO e336 | Trimmer S50F —ECRGADISEI0 05 | Resistor imo ELRIO car | Ceram 26pF SOV 206 | Resistor 200 ELRYO axe | caramic 2S oor | Resistor {ox ELRIO case | Ceram ATF Ov rose | Resistor ina ELRIO cao | Tantalum tur 35V ON sso | Resistor aro ELRYO coat | Caramie oor Sov Roao | Resistor ska cz | Ceramic Ooo SOV ross | Resistor ook ELRIO ca | caramic oor Sov oe | Resistor a7 ELRIO css | Barrier Layer OOF 5V fees | Resistor tka ELAIO cue | caramic or By raat | Resistor tka ELRIO co | Ceramic 2k Sv oes | Resistor on ELRIO caus | Ceramic oor Sov ross | Resistor oo eLRIO caso | Electroiic Ou OV M5 roar | Resistor so ELRIO cast oor Sov fous | Resletor soa ELRIO case Soo1F Sov aaa | Resistor Bro ELRIO 353 oor soy asd | Resistor oO ELRIO Cas oor Sov 2200 ELRIO cass Zor Ov coo ELRIO Case our SOV ss wa ELRIO cas oor SOV won ERO cas8 coor soy oo EURO 63s Soo Sov a euro 280 cowie Sov 700 ELRIO cost OoomF SOV ts00ELR2O Cos2 | Electromtic © A7ur 16M amon EURO 6263 | Ceramic ‘rp 5OV on RHOS2YCN2u06A Coot | Ceramic O001uF SOV root | trimmer ‘son RHOS2¥CN2I05A cass | ceramic mF Sov Fo62 | Resistor en ELRa0 Css | Coramie come SOV Foss sion ELAO Ger | Ceramic Scour SOV ose ana ELAIO Gast | BamerLayer — O0tuF 25 ass ano ELA cae | Ceramic aor Sv 66 za ELA exo Sour sev Ss oer | Resistor Sexo LAO cm cour av rose | Resistor amo ELRIO ca | Caramie Scour SOV Faso | Resistor aR x3 | Caramic Scour SOV ror | Trimmer oka RHOSA1CT4I08A cara | Ceramic door S0v rari | Resistor wo eLRI0 cars| ceramic zr OV ara | Resistor a ELMO care | Coramic ‘opr Sov carr | Garamie 001 Sov Care| Electrolyte Our TOV MS cor | cavamic oor sov care | amorlayer OW 28 cae | carame SF 5OV ‘cae | Ceramic O00 Sov xs | Corame Coosue BV cast | Ceramic 001 s0v cae | Coram oor Sov cae | Garamie “ope 80v e205} Caramie wr SOV cae | Coramie O00 Sov x0 | Ceramic 100oF_ SOV Gace | Eloctroyte ——TOyr S65 x07 | Ceramic cane sv aes | Corame 2a Ov cane | Ceramic oor Sov case | Caramie Ooo SOV x0 | Caramie coor Sov caer | Coramie ‘or SOV exo | Coramie Soowue Sov cece | Caramle Sorbo cat | Ceramic Sootue BV cae | Ceramic Zor BV cai2 | ceramic ‘rv case | Caramic ar SOV cea | Ceramic Soowe Sov cant | Ceramic Sor SOV ca | Coram SoouF SOV casz | caramic Sor 50V cis | Caramic Soour SOV cass | Garamic O00 Sov cx? | Ceramic OoouF sv case | Caramic oor SOV cae | Caramic amr SOV cass | Ceramic coor sv Gai | Bamertayer — Ooou7uF 25 case | Ceramic 29 5OV ca | Coramie Seow Sov coor | Cavamic DoF OV cat | Caramic oor Sov case | Caramie Siok SOV 6a22 | Caramie ane ov caso | Oaramie Ser SOV 323 | Coramic ‘opr Sov 100 | Caramic 150F SOV Gaz | Caramic Coowr Sov car | Ceramic for Sov 6325 | Barer Layer 00047uF 25 cacz | Ceramic frope bvIRF UNIT] [VCO UNIT} REF.NO. | DESCRIPTION PART NO. REF.NO. | DESCRIPTION PART NO. co10s | Coramie O0omF 50V usor | coil MLF3216060R15M cts | Electric TOUR 16 MSS 502 | colt MLF32t6060R12M C405 | Barrir Layer TUF 25 uso | coi! Lezz c106 | Eloctromtie = TOUR Tey MS5 soe | Catt e223 lor | Baer Layer OTuF_ 25 505 | Coit MLFa216r1€1RSM co108 | ceramic Doom SOV 80s | call MLF3216060R 126 400 | Ceramic oom SOV tsor | Catt MLF3216060R 156 cao | ceramic Ooo 5ov uss | ait MLFS216rTATRSM carr | Coramie Ooo1uF 5OV cuz | Coramie STF 5OV cas | Electroytic = «ATF T8V_ MSS sot son MoRIO 02 ana MoRIO 503 ana MORO soot | Connector BNCAM-106 508 aKa MCRTO ‘902 | Connector H5,088601-010 1505 | Restator sx FD ‘902 | Connector HsJ110201040 eos | chip ua MORIO 304 | Connector HECOrA7 01-010 507 | Chip 2200 MORIO 905 | Connector IMsagz01e.1-02-T 508 | Chip orn NCRIO 208 | Connector ims 92016-1027 soo | chip man MCRIO 3307 | Connector 712854 510 | Chip 3K NCRIO so03 | Connector 7125541 pet | Chip son NCRIO ve02 | Connector PoDgAOSM rez | cnip 12m MCRIO rsia | chip 122 MCRTO rere | Resiator tka RO p01 | Connector IMsaac01 HT sis | chp son MCRTE P02 | Connector Msacsz01 HT cs01 | Ceramic Tor Sov cpu: | Fertile Bead RE DLZ0F2634.2H 6502 | Monolithic Ooo GRIAO cpa02 | Ferite Bead RE DL2.OR2691.2H 16509 | Monolithic BF GAMO paca | Ferrite Bead RE DL2.OP2694.2H cc80¢ | Monotinic oor GRNAO pana | Fenite Bead RE DLZOFZ631.2H (6508 | Monolithic OspF GAMO era0s | Ferite Bead RE DL2OP2.691.2H 6508 | Monolithic SOF GAMO pace | PC Board B68 (0507 | Monolithic O00 GRMAO (0508 | Monolithic oor GRID 6509 | Monolithic 00m GRMAO wor | Wire z)oatoesri024 510 | ceramic S709 50V wane | wire 29005571021 511 | Monolithic OW GRMAO wos | Wire 2510805577021 512 | Monolithic oor GAMO woos | wire 2ansiossrvi021 53 | Monolie Spr GRMAO wns | wire 2370805571021 514 | Monoltne © 0DTuF GAMO ws0s | Wire zansoroozto21 0515 | Monoitnic pF GAMO waar | Wire zunwissro21/021 56 | Ceramic Ter sv ws0s | Wire ‘2307t88/021/021 517 | Monolithic g0tuF_GRMAO ws0e | Wire 2e0a0ss/0211021 5:8 | Monolitnc ——OontuF_GRMAO wart | Wire 72m60507K98708 oso | Ceramic DoowF sv ware | Wire ‘arev0s0x087%98 wars | Wie 7amaNOsONeRKO wo | wire 7278605098758, ps0: | Pc. Boars = 4634 wos | Wire 7278801588798 was | Wire areos07x987098 war7 | Jumper Pwr Ron [VCO UNIT} REF.NO. | DESCRIPTION PART NO. ‘0501 ransstor ascarr2 2 (2502 | Transistor 2scarr2 3 503 | Fer 23K210 ¥ at | Transistor scare 9 2505 | Transistor zecarre 3 0508 | Transistor DTcr2aeK sor | Varicap Mass¢ 8 Dso2 | Varieap A334 8 sos | Diode 158158 504 | Diode 188169Icom Inc. 6-9-1, Kamigat, Hraro-ku, Osaka 547, span Prone 06 793 5301 Fax 0678900019 Telex: 05277822 ICOMTR J com mac ne x ees Prone poe 15810 Sao. Fe" fig ao Icom Canada one eo 73 700, Icom (Europe) GmbH Icom (Australia) Py, Lid SS a vo, Arata Icom (UK) Ltd. com France $2(orn Icom Inc. ‘A-1028H-N 69-16, Kamihigashi, Hiano-ku, Osaka $47, Japan Printed in Japan Copyright © 1989 by teom inc