SERVICE MANUAL
Contents
1. PIN PORT EL The CPU enters the cloning mode when the port is LOW The CPU turns the CTCSS 4 7 CPU 801 PORT ALLOCATIONS Interrupt input HIGH Normal operation HIGH LOW HIGH Low RF output is selected LOW selected PTT LOW PTT switch is pushed SCAN Scan starts when the port CONTROL is LOW The CPU reads that the same tone frequency is HIGH The CPU reads that the squelch opens when the port is HIGH The CPU reads that the PLL is unlocked when the port is LOW DESCRIPTION LOW Standby mode High RF output is CLONE LOW 0 received when the port is UNLOCK OUTPUT PORT DESCRIPTION Matrix signal output Matrix is used for CH selection KS5 Matrix signal output LOWO Power control signal output Outputs LOW when the transceiver is programmed for low power output 7 P53 Transmit mute output por CK Clock output for serial data 40 DATA Serial data output beep is emitted over the speaker PLSTB Strobe signal output for the PLL CTSTB Strobe signal output for the CTCSS tone 2 tone control signal output Becomes LOW when DPL or SINGLE tone is selected Power save control output Becomes LOW when t2. 2541162 0146 Ve x 9 29 a O MUTE CLOSE MUTE OPEN 88184 4 6 2201 4 6 5 2 I 0 N N DWAOIO mm LJ m 5 0 5 0 5 i 5 8 H M 8 1 8 8 94 5 5 8 5 2 Quz H amp 2SA1162 5 9120 TX RX 4 5V 82 49 25 2712 z 58 5 TX RX 5 0V x LOCK 5 0V u UNLOCK OV 80 2 ano 12 14 Qu s s 10 2SA1162 21212 2589090 25 909 2 T R TX OV MAIN UNIT 455 10 382 CS 5 22 8 H 8 2 4 2 LM386N 3 1 1050 6 MC3357 0 1 0103 n 28A1162 34 meow pP N 5 R124 5 u 24 56K 5 E 602 1 R382 N R604 S 27 S 3 2607 6607 TOY 9 J301 33028 ceos ceos 29 01 Q102 A 2562712 2 5 58 R121 59 47K RISI IK 8132 Um 4 o 9107 O H 5 0106 5 2 0 00 ssp 25 2712 258909 RX 1 3V be 5 3 845 2 1 1 i 9 R60 1 8 z i E NU MUN Pee m SQL UNIT 52
3. GND CA j RD6 8M B2 D316 Symbol 682 8 PARTS LIST EF PARTS DESCRIPTION PART NO Variable Resistor 1 O 001uF 50 0 001uF 50V 470pF 50V Ceramic Ceramic Ceramic TNC R107 PI28A04M 011 1 08 PI28A04F SMF 01T 1 0 Connector Connector Fuse MC2 1 2 LED TLSG222 LED TLSG222 Microphone KUC 2023 01 006 KSR16 0 18 MS 243 2 MS 243 2P Switch Switch Switch Speaker 40P 177B P C Board P C Board P C Board P C Board B 1702B POWER UNIT B 1703A VOL UNIT B 1704B LED UNIT B 1705B LOGIC EF Wire 13 02 140 01 830 Wire 24 04 050 D02 WO1 Wire 24 01 050 D02 WO1 Wire 24 03 100 D02 WO1 Wire 24 00 080 D02 WO1 LOGIC UNIT uPD75306GF 015 3B9 S 8054ALB LM T 25 3395 2541362 GR 2802712 BL 25 3395 25 1162 25 3395 25 3395 25 3395 25 3395 Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor LOGIC UNIT REF NO DESCRIPTION PART NO 2SA1341 Transistor 1SS181 Diode 1SS190 Diode 1SS196 Diode 1SS196 1SS184 Crystal RF4A3 FAC 4 19 2 Resistor 47kQ MCR10 Resistor 10 Resistor 47kQ MCR10 Resistor 47kQ MCR10 Resistor 47k 1 MCR10 Resistor 47 MCR10 Resistor 10 Resistor
4. 6 6 6 74 ADJUSTMENT 22222 aoe hae eee S RR IA 6 1 6 2 RECEIVER 6 3 6 3 TRANSMITTER 6 5 7 7 1 7 7 1 INTERCONNECTION 7 1 7 2 LOGIC AND EF UNITS 2 eee ea 7 2 75 MAIN e rr asid VT 7 4 15 4 RFEUNIT RR busua 7 6 8 PARTS LIST 8 1 6 VOLTAGE DIAGRAM 9 1 10 OPTIONS 10 1 2 10 1 BM 70 AC BATTERY CHARGER 10 1 10 2 01 42 ENCODER 10 2 SECTION 1 SPECIFICATIONS GENERAL e Frequency range e Type of emission e Number of channels e Frequency stability Antenna impedance e Power supply voltage Usable temperature range e Dimensions e Weight TRANSMITTER e RF Output power At 13 2V DC Modulation system Current drain At 13 2V DC e Microphone impedance Maximum dev
5. SERVICE MANUAL VHF TRANSCEIVER IC H18 Icom Inc OF THE SERVICE MANUAL This service manual covers all service information related to the theoretical physical mechanical and electrical characteristics of the IC H18 VHF TRANSCEIVER ASSISTANCE If you require assistance or further information regarding the operation and capabilities of the IC H18 contact your nearest authorized Icom Dealer Icom Service Center Address are provided on the back cover for your convenience ORDERING REPLACEMENT 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 or service manual page number 3 Unit name and printed circuit board number e g MAIN UNIT B 1665C 4 Component part number and name e g 28C2712 Transistor 5 Order number for mechanical parts 6 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 force any of the variable components Turn them Slowly and smoothly 3 DO NOT short any circuits or electronic parts 4 An insulated tuning tool MUST BE used for all adjustments 5 DO NOT keep power ON for a long time when the transceiver is defective 6 DO NOT transmit power into a signal generator or sweep generator Alw ys connect 30dB or 40
6. 16304 L308 1307 1306 ND487Ci 3R 1305 1303 4 15 332 FL 42 L 330 LR H6 128 145 15 336 N 15 354 gaor 521 di cas C313 5 aj a 5 5 0 01 2 2 x amp 8 lt 8 9 0 d s a 28 84533 amp 8 Bis 21311 5 9 5 5 5 312 5142 st 11 31 8 nig 5 RKO 5 TX 0V x S 8 5 S 5 RX 0 4v S 5 8 H 8 s a 8 2 8 637 135268 cars 22 9304 i 25 3356 x 8 5 8 a 83 4 x RX 0 3V 1 8 RI 5 A 5 prs s s Bh sl js n 18 5 8 8 5 9 5 29 8 ism RX 0 BV 4 R338 A 9 0 30 R358 820K sl LA 237 832865 5 5 1 TX RX 5 0V 5 8 03157 25 2712 R365 3 0 a 5315 C408 0307 C339 1 2 15 m R333 10K 5 0 00 155265 0 001 LA 227 LA 234 219 5 4 9 7 l gt N 4 9 8 8 8 2 a 0345 cya i 28 5 09 L316 8 2 8 8 4 5 K 5 0 y a x 9 5 5 1 85 Bh 5 8 x TX 2 0V 229 827 8 RX 0V 4 813 17 2 S 5 2 5 8 1 RX 0v 5 3 N 3 0 6 Vp
7. 8 SRX 0 9V 5 5 8118 78 T 5 8 15 31 M 51 Te H 5 8 5 200066 TX RX 1 4V R358 820K x N 1 TX RX 5 0V 5 55 31 le 1 5 25 2712 R365 3 28 1502 4 7yH s Je j 8369 oo A z 5 5 8 5 8 R333 Sio 56 9 5 155187 STA 8 68 S Sl 75578 2503 SS oor 3 33028 CY oy 28 4 9 21 15 166 15166 77 6506 0508 _ 9 3 BS 152 5 z 25 302 I 212 8 Sx 5 0595 o 5 x 356 3 2n 1 2 18 o 227 a bry ue 3 1 23 13 amp 5 5 5 81718 A opa 4 x x 515 0 001 8 3 X x z ISI 5 5 4 m 9 5 0 m 8 9307 ST 25 2026 2 5 TX 4 RX O N 0316 20002 R372 10K Q314 TX 4 2V 25 209 RX 5 0V 10 703 10K Q 16701 uPD4066 gt gt 8 8701 4 7K 1070 gt lt K Q 9313 25 1162 R373 3 3K R380 0317 318 esce7i2 TX RX 6 2V C406 0 001 R370 1 5K RF UNIT 312 22 R305 82K Rx
8. Coil Coil Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Trimmer Trimmer Resistor Resistor LS 335 LR 145 LR 116 LS 330 LS 332 LS 331 LA 237 LA 234 LA 227 LALOSNA 4R7K 4 7 LA 235 LA 237 LA 237 LA 237 LA 237 LA 237 LALO2NA 4R7K 4 7 LALO2NA 487 4 74 LALO2NA 101K 100 47kQ MCR10 220 MCR10 220 MCR10 47kQ MCR10 82kQ MCR10 150 ELR20 560 MCR10 100 MCR10 MCR10 MCR10 MCR10 MCR10 MCR10 MCR10 MCR10 ELR20 MCR10 MCR10 MCR10 MCR10 MCR10 MCR10 MCR10 MCR10 MCR10 MCR10 ELR20 MCR10 MCR10 MCR10 MCR10 MCR10 MCR10 MCR10 MCR10 MCR10 MCR10 MCR10 MCR10 MCR10 MCR10 MCR10 MCR10 MCR10 MCR10 MCR10 MCR10 MCR10 MCR10 MCR10 RH0421CJ4J09A RH0421CJ4J09A MCR10 MCR10 RF UNIT REF DESCRIPTION PART NO Resistor 6 8kQ MCR10 Resistor 820 MCR10 Resistor 120kQ MCR10 Resistor 15 MCR10 Thermistor 33D28 Resistor MCR10 Resistor 10kQ MCR10 Thermistor 33028 Resistor 6 8kQ MCR10 Resistor 120kQ MCR10 Resistor 68 MCR10
9. pi R820 C80 IK 9 0 x Q gt 3 J x 5 gt H 0 001 s TX 3 1V 16101 GND eme o iOS TROK BA4558F to TX H 6 DTMF UNIT GND 75 ICIO B 0 5 6 9 22 8107 RHO 7 180K 82K ov TX 4 9V Cros 0 0 2023 01 006 RX O 7V 8 8 Sigel 5 Rise lo 819 5 0 1 a 0103 025 25416 2 6 5 2 5 7 oP ci22 8124 56K x 40P 1778 0 0068 i2k TX LOV 5 RX OV amp TX 0 5v 57 OV 0 5 5 TX 0V e rey 902 99 a I 155226 2562712 5 6 5 13 mm x 2sc2712 2S8909M 4 2 gt x 5 5 45 5 4 4 19 1 9 8 5 x 2562712 5 8 5 5 5 0 1 4104 5 n DATA ____ a L R126 7 8158 10K 167 0 1 1 103 4PD4094BG T C145 0 001 R141 1M R145 1 2K 136 470K 23 12 _____26 C168 0 0047
10. 0 Ceramic 0 001uF GRM40 Tantalum 0 1uF 35V SV Ceramic 470pF GRM40 Ceramic 0 001uF GRM40 P C Board B 1669B SQL UNIT FILTER_UNIT Diode Resistor MCR10 Resistor MCR10 Resistor MCR10 Resistor MCR10 Resistor 2 MCR10 Resistor MCR10 Ceramic 0 1 GRM40 Tantalum 2 2 16 SV Ceramic 0 1pF GRM40 F P C Board B 1596B FILTER UNIT 9 VOLTAGE DIAGRAM MONITOR 82 TLSG222 5 5 u od 0 lt x 5 0 0 56 ug 8 5 888 6 1 BO ax old UNIT rslo OPTIONAL e 868 2 LOGIC UNIT Q 9809 GNO 2903395 2563395 m 5 5 1 40P 1778 UNLOCK VRI w101 02 A n wide ii 0 24 psec 2 k BR2032 1MF L EXT MIC J103 IC80 AiPD753066F 015 9 EXT SP 3O0msec 6000 J104 7 08 50 PLST ov A 0 When power sove SCAN x mU cam 2541341 Q 3 5 gt Wi R827 0 5 1 OFF 2 9V Backup R80 47K D80 1 2 15518 Oa 807 06 2 2 2 41 2341362 ess 2503395 1 2 15518 9818 47K DATA 16802 5 8054 18 1 0803 2212
11. 0111 0109 0106 0108 0105 0116 0113 0115 0110 0112 0117 0118 0114 0119 0120 0121 BASE BASE SOURCE COLLECTOR COLLECTOR Fd B I BASE EMITTER EMITTER Q COLLECTOR DRAIN ITTER 6 Symbol LL Symbol 3 Symbol VY FOIL SIDE 10 RF UNIT Busv soLv Aro gt gt 504 um A cmn m Lares ec al pioa Loer pustfoaralex eno to RF UNIT to LOGIC UNIT 155226 155184 4 7 3 010 155190 155181 0101 0102 0103 0104 0106 0110 0111 0105 0108 0109 Symbol Symbol 3 Syrnbol 473 Symbol W8 Symbol Symbol 7 4 RF UNIT e VCO UNIT COMPONENT SIDE FOIL SIDE 25 302 GR Q501 DRAIN LJ SOURCE GATE Symbol 6 e FILTER UNIT SIDE FOIL SIDE 1SS193 D701 GND Wee STB 5 8 OUTZ OUTI GND R5 m Symbol F3 e POWER UNIT SQL UNIT P 1 eee Rr CB 1703A C603 Reo 13 SN E R602 zu 5 p AFO 9 12 GND 11 SQLV R5 25 106 HSM88AS Q601 D601 SouAce 15 E DRAIN AT L Symbol Symbol C1 7 4 SC 1046 1C302 POWER MODULE MC3357DR 1 301 LOWER POWER FM IF SQUELCH FILTER INPUT INPUT RF AUDIO SCAN FILTER DEMODULATOR
12. Connector Connector Switch SKHHLPOOO PTT P C Board B 1665C MAIN UNIT F P C B 1710 LOGIC MAIN MAIN UNIT Wire Wire Wire Wire Jumper Jumper Jumper Jumper RF UNIT IG IC IC IC FET Transistor FET Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor FET Transistor Transistor Transistor Transistor Transistor Transistor Varicap Varicap Varicap Varicap Diode Diode Diode Diode Diode Diode Varicap Diode Diode Zener Crystal Ceramic Crystal Crystal Coil Coil Coil Discriminator DESCRIPTION PART NO 21 21 21 201 MCR10 JPW MCR10 JPW MCR10 JPW MCR10 JPW DESCRIPTION PART NO MC3357 DR SC 1046 PLL2001 ND487C1 3R 3SK131 K 2SC2026 2SK241 GR 2SC3356 2SC3356 2SC2026 25 2026 25 1162 2SA1162 GR 2802712 BL 2562712 BL 2581237 2 R 251162 GR 25209 O 2502712 BL 251162 GR 2802712 BL 2802712 BL 2803356 2581237 TV2 R MA334 B MA334 B MA334 B MA334 B 155226 155265 15597 15597 155265 155268 16 15599 155187 RD6 8M B2 FL 42 2 455 10 70 212 10 2 CDB455C7A LS 334 LS 335 LS 336 RF UNIT 1304 DESCRIPTION PART NO Coll Coil Coil Coil Coil Coil Coil Coil Coil Coil Coil Coil Coil
13. 1 MCR10 Resistor 47 MCR10 Resistor 47 MCR10 Resistor 47 10 Resistor 47kQ 10 Resistor 4700 MCR10 Resistor 4700 MCR10 Resistor 4700 MCR10 Resistor 22kQ MCR10 Resistor 100kQ MCR10 Resistor 47kQ MCR10 Resistor 1MQ MCR10 Resistor 1kQ MCR10 Resistor 100kQ MCR10 Resistor 1MO MCR10 Resistor 100kQ MCR10 Resistor 47kQ MCR10 Resistor MCR10 Resistor 220kQ MCR10 Ceramic 0 01uF GRM40 B Tantalum TESVD0J476M 12L Ceramic 0 01uF GRM40 B Ceramic 15pF GRM40 CH Ceramic 15pF GRM40 CH Ceramic 0 001u4F 0 Ceramic 0 001uF 0 Ceramic 0 001nF GRM40 B Ceramic 0 001u4F GRM40 Ceramic 0 001uF GRM40 B SLEM12R 2 Connector SKH 180001 CLONE Switch Lithium Battery BR2032 IHF B 1664C LOGIC UNIT P C Board MCR10 JPW MCR10 JPW Jumper Jumper MAIN UNIT REF DESCRIPTION PART NO IC BA4558F IC LM386N 3 uPD4094BG IC MN6520 Transistor 28 2712 BL Transistor 28C2712 BL Transistor 251162 GR Transistor 2 1162 GR Transistor 251162 GR Transistor 25 2712 BL Transistor 258909 Transistor 25 2712 BL FET 25 106 Y Transistor 2802712 BL Transistor 25 909 Transistor 25 2712 BL Transistor 2SB909M Transistor 2SC2712 BL Transistor 25 909 Transistor 2SA1162 GR Transistor 2SA1162 GR Transistor 2SB909M R Transistor 2SC2712 BL Transistor 2SC2712 BL T
14. 241 5 16108 29 4 194MHz 00409486 MN6520 DATA CK CTSTB RX MUTE CERAMIC 0109 Deo Fisoe 230106 188226 CFZM455E10 FILTER s AF AMP ACCELERATOR UN IT yqa HPF SQUELCH j b Loo 9108 CONTROL I 4066 02841182 25 2712 25 2712 2 L L VOLUME PESTB CONTROL REG RX REFERENCE COUNTER PHASE DETECTOR 250971 MUTE PLL LOCK 0107 3109 LATCH DETECTOR AF 2SB909M ESAE 2001 POWER 16102 5 R5 T5 CURRENT CURRENT AMP AMP Q114 escer12 Q115 258909 0110 2200008 9111 258909 0112 222 9113 258909 4 CONTROL 0116 0117 2SA1162 x2 UNLOCK SENSOR 0120 0121 2 62712 2 TX RX TX RX LOGIC UNIT UNIT 0301 0302 MA334X2 CRYSTAL IF AMP d FILTER 9502 71301 21M15B3 16304 ND487C1 3R ANT V BUFFER TUNING AMP CONTROL p 0304 9314 18897 x2 LPF 2SC3356 25 209 9508 930 D307 0310 25 1162 2 155256 2 0310 20002 2581237 AAA mE VCO UNIT LOOP vco D FILTER 3 9307 0306 2562026 2562026 BUFFER AMP LPF TX CK DATA E PLST k A LOC lt 0319 8 DETECTOR BA4558F Q 25 33
15. INPUT GND MUTE CONTROL OUTPUT OUTPUT 16 14 LIMITER LIMITER QUAD CRYSTAL OUTPUT INPUT OUTPUT INPUT OSCILLATOR DECOOPLING ND487C1 3R 1 304 SCHOTTKY BARRIDER DIODE QUAD 1 4 20 4 1 2 u 3 PLL2001 1 303 PLL SYNTHESIZER IC ov FILTER UNIT SQL UNIT uPD4066BG 1C701 45069 1C601 QUAD BILATERAL SWITCHING INVERTER GATE CONTROL IN IN OUT OUT a i OUT 51 3SK131 1301 Symbol V13 2502712 BL Q310 Q311 Q315 Q317 Q318 Symbol LL 25C2026 Q302 Q306 Q307 aa 5 i COLLECTOR EMITTER BASE 2SB1237 TV2R Q312 Q320 E COLLECTOR C E s T Emitter COLLECTOR OUT VCO UNIT to MAIN UNIT P103 FILTER UNIT 25K241 K Q303 256209 0 0314 SIRE GATE DRAIN Symbol XO 10 MAIN UNIT P104 25 3356 0304 0305 01319 COLLECTOR EMITTER Symbol R22 251162 GR Q308 Q309 0313 0316 BASE _ Symbol 56 SIDE R314 GND 12 8315 155226 0306 Symbol R5 SQLV c 155268 0311 Symbol 155187 0315 Symbol 03 gt 35 6 1 94 1555 330
16. PH M2x25 0060 3 Q 4 _ mme O 8990 8 Module mounting plate 1 4 2 Spring 8x 1 Release bution 1 _ 889929 2 9 Sliding guide mo Q9 raman 899921 4 Connection spring 993055 _ Gomthode 1 Screw type Screw M2x6 etc Self tapping screw 2x4 etc Precision type screw 0 1 Screw head style PH head BH Button head FH Flat head Headless hex head e AND PANELS TOP PANEL UNIT LOGIC UNIT CONTACT HOLDER RF UNIT 5 2 0 6 ADJUSTMENT PROCEDURES 6 1 PLL ADJUSTMENT TEST INSTRUMENTS REQUIRED 1 AC POWER SUPPLY e Output voltage 13 2V DG e Current capacity or more MEASUREMENT CONNECTION LOCATION FREQUENCY COUNTER AC POWER SUPPLY 2 FREQUENCY COUNTER Frequency range 0 1 180MHz to BATTERY Frequency accuracy 1ppm or better TERMINAL Sensitivity 100mV or better Loose couple to antenna TRANSCEIVE fe DC VOLTMETER DC Input impedance or better VOLTMETER to R706 MEASUREMENT ADJUSTMENT ADJUSTMENT CONDITIONS VALUE unr LOCATION UNIT ADJUST Loose
17. Resistor 2 2kQ MCR10 Resistor 1000 MCR10 Resistor 1 5 MCR10 Resistor 4 7kQ MCR10 Resistor 10 MCR10 Resistor 3 3 MCR10 Resistor 47kQ MCR10 Resistor 100 MCR10 Resistor 10kQ MCR10 Resistor 100 MCR10 Resistor 3 3kQ MCR10 Resistor 1200 MCR10 Resistor 1 8 MCR10 Resistor 2200 MCR10 Resistor 27 10 Resistor 47kQ 10 Resistor 1000 MCR10 Resistor 100kQ MCR10 Resistor Ceramic Ceramic 0 001uF 0 Ceramic 0 001uF GRM40 Ceramic 1pF GRM40 Ceramic 27pF GRM40 Ceramic 0 001uF GRM40 Ceramic 0 001uF 0 Ceramic 0 001uF 0 Ceramic 27pF GRM40 Ceramic 0 5 GRM40 Ceramic 1pF GRM40 Ceramic 22pF GRM40 Ceramic 3pF GRM40 Ceramic 22pF GRM40 Ceramic 0 01uF GRM40 B Ceramic 220pF GRM40 Ceramic 0 01uF GRM40 B Ceramic 0 001uF 0 Ceramic 5pF GRM40 Ceramic 180pF GRM40 Ceramic 0 001uF GRM40 Ceramic 0 001 pF GRM40 Ceramic 47pF GRM40 Ceramic 0 1uF GRM40 Ceramic 220pF GRM40 Ceramic 120pF GRM40 Ceramic 68pF GRM40 Ceramic 0 022uF 0 Ceramic 0 1uF GRM40 F Ceramic 82pF GRM40 Ceramic 0 01uF GRM40 B Tantalum 4 TEMSVA0J475M 8L Ceramic 180pF GRM40 Ceramic 15pF GRM40 Ceramic 15pF GRM40 Ceramic 0 001uF GRM40 Ceramic 12pF GRM40 Ceramic 8pF GRM40 Ceramic 27pF GRM40 Ceramic 2pF GRM40 Ceramic 15pF GRM40 Ceramic 0 001 GRM40 Ceramic DESCRIPTION PART NO Ceramic 0 001nF 0 0 0014
18. oscillating signals are controlled by a varactor diodes D502 D503 DC voltage PLL lock voltage is provided through the loop filter D701 is used as an accelerator to ensure rapid PLL lock up time On the other hand the output of the loop filter pas ses through Q314 and is used as the voltage for controlling the bandpass filter D301 D304 of the receiver RF circuit 4 3 4 UNLOCK CIRCUIT MAIN UNIT When the PLL circuit is unlocked pin 7 of 1C303 is LOW A LOW signal is applied to the unlock circuit consisting of 0120 and 0121 The unlock circuit outputs the resulting signal to the CPU 801 pin 62 4 3 5 CIRCUIT RF UNIT D501 changes the inductive reactance of the Clapp oscillator Q501 shifting the receive and transmit frequencies Varactor diodes D502 D503 provide frequency control The buffer amplifier Q305 Q319 is unaffected by VCO oscillation VCO UNIT from Loop Filter 4 4 VOLTAGE LINES DESCRIPTION This voltage is applied to Q316 Q317 the 5V regulator circuits and IC102 through the fuse F1 and POWER SWITCH The line voltage changes depending on type of the battery pack 7 2V CM 71 8 4V CM 72 13 2V CM 73 The regulator circuit consisting of Q118 Q119 D111 and D112 supplies 5V with low noise This circuit applies a continuously stable output voltage in any mode because the circuit is constructed using a complementary connection ensuring
19. p s 5 o 8 8 8 8 5 3 8 8 9 Te TX L3V Q P 25 2026 10701 TX 4 8V PD4066 8 RX 0V 8701 4 7K 8 5 lt 10708 8 9308 309 2 0314 TX 4 2V TX 2 6V 25 209 RX 5 0V 5 2 PE fp gt 9 K 5 3 5 2 8 5 202 X 0V 93 3 f 202 R355 L5K y H euis 179 FILTER UNIT j N 2 ST 0 7 peal a a a ees 2 5 Sh Rx O5v E 0312 0310 3 1 28 8 25 2712 TX RX 6 2V 0312 320 2581237 9598 3 4 0399 0 184 z amp gza 429950 94 2 9 zza 49950 G 497729 A amp g w25 Q lt O LL o Z 2 n 046 See MAE 029 221 SECTION 10 10 1 70 8 9529 20 22 10 1 2050 29 50 14 6 di A dziii u20 89950 60 0900000 10 2 0 42 ENCODER UNIT C49 0 00 104 1840872 042 3 246 RAS 47K 9 58 0 30000 44 100 847 Deviation Adj Push Key
20. 01 27K RISO CI29 0 00 3 C413 470P 0167 0 1 8155 10K 1 60409486 05 15 0411 0 001 0147 0 01 1 gt 5 a lt 10104 MN6520 5 8 C148 22 RI58 10K C151 0 001 0152 47 38 220 R376 10K 5 55 5 0 28 8 5 5 TX RX 5 1V BUSY 5 H 5 8 x 0120 PLST 5 25 2712 u 8 55 9 LOCK 0 6V 5 UNLOCK OV 5 LOCK 5 0V n UNLOCK OV ee 52 Que aus 2sc2712 2SB909M 2 T R 2 R384 100 1 5K C329 68 CFZM455E10 C325 0 1 08455 7 RX 0 5V R317 22K R385 100K RX RX 4 2 V 9303 25 241 14 1308 F130 L307 1306 ND487Ci 3R 1305 C32 180 LS 332 FL 42 15 330 LR n6 r LR 145 x x cm e S El 0 5 8 stm T 5 5 8 9 ol 5 C326 220P 8 255 5 5 TX OV s 2115 1 5 3 RX 1 9V 5 E on o X 2 5 5 1 9 81 9 5 5 1 28 5 z 35 377 183268 cars 29305 7 22 SotV TX RX 2 1V lt 8 RX 0 3V
21. 02 attenuator between the transceiver and a deviation meter or spectrum analyzer when using such test equipment 7 Read the instructions of test equipment thoroughly before connecting the equipment to the transceiver SECTION SECTION SECTION SECTION SECTION SECTION SECTION SECTION TABLE OF CONTENTS 1 SPECIFICATIONS 1 1 2 OUTSIDE AND INSIDE 2 83 2 1 OUTSIDE VIEWS ei e dut 2 1 2 2 INSIDE VIEWS 225 cos quas sa ele WEE ET x 2 2 3 BLOCK 3 1 4 CIRCUIT 4 75 4 1 RECEIVER 5 4 1 4 2 TRANSMITTER 5 4 2 4 3 PLE CIRCUITS iki re ehe rr ERR RI m 4 3 4 4 VOLTAGE eor RU 4 4 4 5 5 5 SWITCHING CIRCUIT MAIN UNIT 4 4 4 6 CTCSS CIRCUIT MAIN 4 4 4 7 1 801 PORT 8 4 5 5 MECHANICAL PARTS AND DISASSEMBLY 5 1 2 6 ADJUSTMENT
22. 1042 36 2 Wide type TC4SU69F 1 2 2 Narrow type R48 Monitor Level Adj DTMF MUTE DTMF TX DTMF RX GND T5 T T r m fot UJ amy 5 M 6 B 3 4 we 4 1 yusa que Tg qi o 1 4 1 10 E 2 x 1 JI ESEESES Ul WA H 10 2 Icom Inc 6 9 16 Kamihigashi Osaka 547 Japan 06 793 5301 06 793 0013 Telex 05277822 ICOMTR J Icom America Corporate Headquarters gt 2380 116th Avenue N E Bellevue WA 98004 U S A Phone 206 454 8155 Fax 206 454 1509 Telex 152210 ICOM AMER BVUE Customer Service Phone 206 454 7619 Regional Customer Service Centers 3150 Premier Drive Suite 126 Irving TX 75063 U S A Phone 214 550 7525 Fax 214 550 7423 1777 Phoenix Parkway Suite 201 Atlanta GA 30349 U S A Phone 404 991 6166 Fax 404 991 6327 Icom Canada A Division of Icom America Inc 3071 5 Road Unit 9 Richmond B C V6X 2T4 Canada Phone 604 273 7400 Fax 604 273 1900 Icom Europe GmbH Communication Equipment Himmelgeister Str 100 4000 D sseldorf 1 W Germany Phone 0211 346047 Fax 0211 333639 Telex 8588082 ICOM Icom Australia Pty Ltd Incorporated In Victoria 7 Ouke Street Windsor Victoria 3181 Australia Phone 03 529 7582 03 5
23. 108 amplifies the signal to a sufficient level to drive 102 When the squelch is closed Q109 functions as an AF mute switch Q108 functions as both an AF preamplifier and a high pass filter The signal passes through the VOLUME CONTROL R1 and is applied to the AF amplifier 1C102 pin 2 The regulated DC voltage is applied to pin 6 of 102 through the voltage regulator circuit consisting of Q107 0106 and 0104 In this way 1 102 should be damaged from overloading 4 1 7 SQUELCH CIRCUIT RF AND LOGIC UNITS R604 and R605 connected to 9 of 12301 improve the temperature characteristic of the AF output power The internal op amp IC301 amplifies noise com ponents of frequencies at 20kHz and above and outputs the resulting signals from pin 11 Output signals are rectified by D601 The rectified voltage triggers the squelch circuit in 301 Pin 13 of IC301 outputs the squelch signal The signal is applied to the CPU 0801 pin 61 through the BUSY signal line The squelch circuit is activated when Q109 is turned by a signal RMUT from the CPU 801 52 from 1 4 2 TRANSMITTER CIRCUITS 4 2 1 MICROPHONE AMPLIFIER MAIN UNIT AF signals from the built in condenser microphone are applied to IC101A at pin 3 and are pre emphasized to 6dB octave through C104 and R102 connected to 2 1C101A functions as the microphone amplifier and the limiter The signals pass thr
24. 29 8765 Fax 03 529 8485 Telex AA 35521 ICOM AS Icom UK Ltd Unit 9 Sea St Herne Bay Kent U K Phone 0227 363859 Fax 0227 360155 Telex 965179 Icom France 5 120 Route de Revel BP4063 31029 Toulouse Cedex France 61 20 31 49 Fax 61 34 05 91 Telex 521515 FRA Count us A 5016S Icom Inc Printed in Japan 6 9 16 Kamihigashi Hirano ku Osaka 547 Japan Copyright 1988 by Icom Inc
25. 40 GRM40 BB04J03M BB04J04M BB04J09M Connector Ferrite Bead B 1666A RF UNIT DL2 OP2 6 3 1 2H RF UNIT REF NO DESCRIPTION PART NO Jumper JPW 01 R 01 Jumper JPW 01 R 01 Jumper MCR10 JPW Jumper MCR10 JPW Jumper MCR10 JPW Jumper MCR10 JPW VCO UNIT REF DESCRIPTION PART NO FET 2SK302 GR 1SS265 1SV166 2B 1SV166 2B Diode Varicap Varicap Coil S7T BN Coil LALO2NA 4R7K 4 74 Coil LALO2NA 2R2M 2 2 Coil LALO2NA 4R7K 4 7 Coil LALO2NA 4R7K 47 Coil LALO2NA 4R7K 47 MCR10 MCR10 100KQ 1200 Resistor Resistor Ceramic 470pF GRM40 Ceramic 68pF GRM40 CH Ceramic 0 001uF GRM40 Ceramic 68pF GRM40 Ceramic 39pF GRM40 Ceramic GRM40 UJ Ceramic 1pF GRM40 Ceramic 0 01 GRM40 F Ceramic 0 5pF 50V Ceramic 3pF GRM40 UJ Ceramic 0 001 4 GRM40 P C Board B 1670B VCO UNIT SQL UNIT DESCRIPTION PART NO IC TC4SU69F 2SJ106Y Transistor HSM88AS Resistor 1 8kQ MCR10 Resistor 330kQ MCR10 Resistor 2 2kQ MCR10 Resistor 1 0kQ MCR10 Thermistor 33D28 Resistor 47KO MCR10 Thermistor 33D28 Resistor 1MO MCR10 Resistor 4 7 MCR10 Thermistor 33D28 Resistor 12 MCR10 Ceramic 0 01uF GRM40 Ceramic 0 01pF GRM40 Ceramic 33pF GRM40 CH Ceramic 0 001uF GRM40 Ceramic 0 001uF
26. 56 313 2002 dum qas 2 lt gt y Rx 0802 gt CALL 0801 FS CPU CPU BACKUP 1C801 X801 4 19MHz 0804 APD75306GF 015 3B9 158196 10802 S 8054ALB LM Q801 2SC3395 Q802 2SA1362 D803 1SS196 CPO 9104 2002 4807 253395 SECTION 4 CIRCUIT DESCRIPTION 4 1 CIRCUITS 4 1 1 ANTENNA SWITCHING CIRCUIT RF UNIT Received signals enter the antenna connector and pass through a two stage Chebyschev low pass filter L311 1312 C340 C344 The signals are applied to the antenna switching circuit D307 D310 L310 C337 C338 and then to the RF circuit This antenna switching circuit employs a A 4 type diode switch ing system 4 1 2 RF CIRCUIT RF UNIT The filtered RF signals are applied to the RF amplifier Q301 and reapplied to the bandpass filter L304 D303 D304 C309 C312 to suppress out of band signals 4 1 3 1st MIXER CIRCUIT RF UNIT This circuit is a double balanced mixer composed of four Schottky barrier diodes D305 From the mat ching transformer L305 the RF signals are applied to D305 The product of the 1st LO signal passes through C314 and is applied to 0305 1306 outputs a 21 8MHz 1st IF signal 4 1 4 1st IF CIRCUIT RF UNIT After passing through the IF amplifier Q302 and the matching transformer L307 the 1st F signal is applied to the crystal filt
27. 702B 0 W101 WTO2MNWIOS W104 to MAIN UNIT P LOGIC UNIT COMPONENT SIDE 25 2541362 GR 0801 0804 0802 0806 0807 0808 0809 1 COLLECTOR COLLECTOR EMITTER Symbol BY Symbol AEG 155187 155190 155196 0801 0802 0803 0804 E Symbol D3 Symbol E3 Symbol G3 25 2712 BL 0803 BASE COLLECTOR EMITTER Symbol LL 155184 0805 E Symbol B3 25 1162 GR Q805 BASE COLLECTOR Symbol CLONE SWITCH 2SA1341 Q810 J COLLECTOR EMITTER Symbol BL FOIL SIDE to MAIN UNIT pata csta sv psc errer wur esr Tn ow o E 5 P 1 f Un 7724 18 1 J801 TRANSMIT CALL INDICATOR to MONITOR SWITCH S2 fo SCAN SWITCH S3 to CHANNEL SELECTOR 51 7 3 UNIT 4558 101 LOW NOISE DUAL AMPLIFIER uPD4094BG 1C103 8 STAGE SHIFT AND STORE BUS REGISTER STROBE i SERIAL CLOCK Qi LM386N 3 1 102 AUDIO POWER AMPLIFIER GAIN BYPASS Vcc OUTPUT el 7 e 5 GND INPUT INPUT GND MN6520 1 104 CTCSS ENCODER DECODER COMPONENT SIDE to MIC SPEAKER DTMF UNIT UNIT eere werfen oer to VOL UNIT 5 p 25 2712 BL 25 1162 258909 251106 0101 0102 0103 Q104 0107
28. 8 form a parallel resonant circuit The RF output signal from 1C302 is not applied to receiver circuit but passes through L315 D307 and C339 the low pass filter L311 1312 C340 C344 and then on to the antenna The impedance of the parallel resonant circuit increases Signals which leak through the resonant circuit are bypassed through D310 and Q310 4 3 PLL CIRCUITS 4 3 1 GENERAL The PLL circuit using a direct programmable divider 1C303 is designed in a way that allows the desired frequency to be generated directly at the VCO circuit 1C303 sets the dividing ratio based on ser al data from the CPU 801 and compares the phases of the VCO signal and the reference oscillator fre quency It detects the out of step phase and out puts it 4 3 2 REFERENCE OSCILLATOR CIRCUIT RF UNIT A reference frequency is acquired by Q315 and X302 D313 R361 and R364 provide frequency control Thus the output frequency of this circuit is stable over a wide temperature range PLL CIRCUIT from Microphone Amp LOOP FILTER PLST 5 LOW PASS FILTER 1 1011 2 CHARGE DETECTOR PUMP 0316 0318 1 303 PLST 10 DATA REFERENCE CK OSCILLATOR 4 3 3 CHARGE PUMP AND LOOP FILTER CIRCUITS RF UNIT Phase detected signals from pins 5 and 12 are con verted to DC voltage by the charge pump Q316 Q318 and a lag lead loop filter consisting of R701 702 R705 and C702
29. F 0 Ceramic 0 0010F GRM40 Tantalum 4 7 TEMSVA0J475M 8L Ceramic 0 001uF GRM40 12 GRM40 Ceramic 12 GRM40 Ceramic 0 001 F 0 0 001pF 0 0 001uF GRM40 Ceramic 0 1uF GRM40 F Ceramic 0 001 GRM40 Ceramic 0 001uF 0 15 GRM40 Tantalum 2 2uF 16V DN Ceramic 0 001uF GRM4O Ceramic 0 01uF GRM40 B Ceramic 0 001uF GRM40 Ceramic 0 01 GRM40 B Ceramic 0 001nF 0 Ceramic 0 001uF GRM40 Ceramic 0 001uF GRM40 Ceramic 27pF GRM40 Ceramic 0 001uF 40 Ceramic 0 001uF GRM40 Ceramic 2pF GRM40 Ceramic 0 012 0 Ceramic 0 0010 GRM40 10 GRM40 Ceramic 0 001uF GRM4O Ceramic 22pF GRM40 Ceramic 4 GRM40 Tantalum 6 8uF 63 SV Ceramic 0 022uF Ceramic 0 001uF Ceramic 22pF Ceramic 0 001 0 001 7 5 Trimmer 20pF Ceramic 220pF Ceramic 100pF Ceramic 0 022uF 0 Ceramic 0 1pF GRM40 F Tantalum 4 7 10V SV 0 1uF GRM40 Ceramic 0 001uF 0 Ceramic 100pF GRM40 Ceramic 0 001uF 40 Ceramic 0 1uF GRM40 F Ceramic 0 001uF GRM40 Ceramic 33pF GRM40 Ceramic 0 001uF GRM40 Tantalum 4 7 TEMSVA0J475M 8L Ceramic 0 001uF GRM40 Ceramic 0 01uF GRM40 B Ceramic 0 001 GRM40 Ceramic 5 0 001 0 15 GRM40 Ceramic 470pF GRM40 Ceramic 12pF GRM40 Ceramic 0 001uF 40 ECRGA020E30 GRM
30. LL INDICATOR FRONT AND SIDE VIEWS EXTERNAL SPEAKER MIC JACK PTT SWITCH BATTERY PACK RELEASE BUTTON BATTERY PACK 2 2 INSIDE VIEWS LOGIC UNIT 0 Channel selector 51 KSR16 0 18 AND LOGIC UNITS RX mute circuit PTT switch S101 X101 4 194 MHz CTCSS tone encoder decoder 1C104 MN6520 T R control circuit Backup battery BT801 BR2032 IHF CPU C801 uPD75306GF 015 Power switch volume control R1 RK0971111 T e PANEL Rear side vg 8 MIC KUC 2023 01 006 SP1 40P 177B UT 42 DTMF UNIT OPTIONAL Mic amp limitter LPF 1C101 4558 AF power amp 10102 LN386N 3 Regulator circuit Current amp circuit Data control IC 103 4094 1 S801 SKHHLBO001 UNIT SQL UNIT 1st IF amp 0303 25 241 Ceramic filter 302 CFZM455E10 1st mixer IF amp circuit Crystal filter FI301 21M15B3 RF power amp 302 SC 1046 APC circuit VCO UNIT PLL circuit Pre drive amp circuit FILTER UNIT 3 BLOCK DIAGRAM MAIN UNIT 1 0303 LN386N 3 SHIFT REGISTER CONTROL X101 28
31. R10 Resistor 1 2kQ MCR10 Resistor 47kQ MCR10 Resistor 10 Resistor 12kQ MCR10 Resistor 10kQ MCR10 Resistor 820kQ MCR10 Resistor 10kQ MCR10 Resistor 10kQ MCR10 Trimmer 47kQ RHO4A3AS4J Resistor 1kQ MCR10 Resistor 47 MCR10 Resistor 47kQ 10 Resistor 15 MCR10 Resistor 10kQ 10 Resistor MCR10 Resistor MCR10 Resistor 6 8kQ MCR10 Resistor 10kQ MCR10 Resistor 180kQ MCR10 Resistor 33ka MCR10 Resistor 10kQ MCR10 Resistor 10kQ MCR10 Resistor 6 8kQ MCR10 Resistor 470kQ MCR10 Resistor 33kQ MCR10 Resistor 120kQ MCR10 Resistor 560 MCR10 Resistor 56kQ MCR10 Resistor 4 7kQ MCR10 Resistor 100kQ MCR10 Resistor 100 MCR10 Ceramic GRM40 Ceramic 0 001uF 0 0 01 GRM40 Tantalum 0 1uF 35V SV Ceramic 0 001uF 40 0 001uF GRM40 0 001uF GRM40 Ceramic 0 0014F GRM40 Ceramic 0 0022uF 0 Ceramic 470pF GRM40 Ceramic 100pF GRM40 CH Ceramic 0 001nF 0 Tantalum 2 2uF TEMSVA1C225M 8L Ceramic 0 1uF GRM40 Tantalum 2 2uF TEMSVA1C225M 8L Ceramic 0 1pF GRM40 F Ceramic 0 1uF GRM40 F Ceramic 0 1uF GRM40 Ceramic 0 001uF GRM40 Ceramic 0 1uF GRM40 Ceramic 0 0068 0 0 0068 0 47 GRM40 MAIN UNIT REF DESCRIPTION PART NO Ceramic 47pF GRM40 Ceramic 47pF GRM40 Electrolytic 100uF 6 3V 3 Elect
32. TION METER Frequency range 1kHz 10Hz Measuring range 1 100 to EXT SP JACK 4 NON INDUCTIVE RESISTOR Impedance 80 ADJUSTMENT SENSITIVITY SQUELCH to to BATTERY TERMINAL TRANSCEIVER ADJUSTMENT MEASUREMENT POINT VALUE UNIT ADJUST ADJUSTMENT CONDITIONS NOTE When the sensitivity is less than 0 28 12dB SINAD on every channel the following sensitivity adjustment is not necessary Skip to squelch adjustment below To adjust the RF bandpass filters see the diagram on p 6 1 Minimum distortion level Connect the distortion meter with an 80 load to the EXT SP JACK Operating frequency Center of the frequency edge Receiving Apply an RF signal to the ANTENNA CONNECTOR Level 118dBm 0 28 Mod 1kHz Dev 2 MONITOR SWITCH NOTE Before squelch adjustment be sure that the sensitivity on every channel is less than 1 0 28 12dB SINAD 1 Squelch threshold point Apply RF signal to ANTENNA CONNECTOR Level 120dBm 0 22 1kHz Dev 3 5kHz e Turn R160 max counterclock wise Front Speaker UNIT 1309 Sensitivity adjustment 6 L308 Sensitivity adjustment MAIN UNIT UNIT LOCATION JA m R160 Sq
33. couple the L Same frequency as the programmed one To check the programmed frequency use the EX 704 PLL REFERENCE FREQUENCY Select any channel e Transmitting Connect an antenna frequency counter to the antenna NOTE Lock voltage affects the ratio If you adjust the lock voltage set the frequency with the EX 704 LOCK VOLTAGE Operating frequency FILTER Connect the DG 1 3V 148 0000 MHz voltmeter to R706 Receiving Transmitting AND MAIN UNITS 5 Extension cable kit 649 04 Extension cable kit 649 09 1 3V Extension cable kit 649 03 Three kinds of extension cable kit are available for fixing the RF UNIT Order the extension cable kit from an authorized Icom Dealer UNIT MARCUS iem m ose onm om o L501 Lock voltage adjustment R706 Lock voltage check point VCO UNIT C393 PLL reference frequency adjustment FILTER UNIT 6 2 RECEIVER ADJUSTMENT TEST INSTRUMENTS REQUIRED 1 AC POWER SUPPLY Output voltage 13 2V DC Current capacity or more MEASUREMENT CONNECTION LOCATION NON INDUCTIVE RESISTOR DISTORTION METER 2 STANDARD SIGNAL GENERATOR SSG Frequency range 0 1 180 MHz Output level 127 17 dBm 0 1pV 32mV STANDARD 3 DISTOR
34. er FI301 to suppress out of band signals The 15 IF signal is then applied to the 2nd IF circuit via L308 4 1 5 2nd IF AND DEMODULATOR CIRCUITS RF UNIT The 1st IF signal amplified at amplifier Q303 passes through the matching transformer L309 The 1st IF signal from L309 is applied to the 2nd mixer section of 10301 and is mixed with 2nd LO signal to convert the 1st IF signal to a 455kHz 2nd IF signal 1C301 contains the 2nd mixer circuit the 2nd LO circuit and the quadrature detector circuit The 2nd LO circuit and X301 generate 21 345MHz for the 2nd LO signal The 2nd IF signal from the 2nd mixer IC103 pin 3 passes through the ceramic filter F1302 where un wanted signals are suppressed it is then amplified at the limiter amplifier section IC301 pin 5 and applied to the quadrature detector section 1 301 pin 8 and ceramic discriminator X303 to demodulate the 2nd IF signal into an AF signal AF signal output from pin 9 of IC301 is applied to the AF circuit 4 1 6 AF CIRCUIT MAIN UNIT The AF signal from 1C301 is applied to pin 29 of 1C104 1C104 contains the CTCSS tone encoder decoder the AF amplifier and the two stage AF filter Passing through the AF amplifier section and the two stage AF filter in IC104 the filtered signal is output from pin 18 The 6dB octave low pass filter R155 C153 C167 deemphasizes the signal which then passes through the muting circuit Q109 The AF preamplifier Q
35. he power save function is activated Transmit Receive switching output Becomes LOW with input when transmitting Receiver mute output Becomes HIGH when receiver audio output is muted Outputs a 1kHz pulse when a Busy signal outut Outputs a signal synchronized with the BUSY input Directly drives the TRANSMIT BUSY INDICATOR ERE DATA output Matrix signal output pins 5 MECHANICAL PARTS AND DISASSEMBLY LABELLED ORDERING NUMBER DESCRIPTION NUMBER QTY o mozas 1 __ casings 6 1 9 Swaerpae 3 includes HLH M3x3 8810003520 1 NeoiPHM2xzZK 31 knob Powerom Tp 8899430 72 Q itm 20 Ne01PHM2x28 0060 2 1 AntenacomectorTNCRi includes nut 6510007250 Q No0iPHM2x28 mp Switch seal 00 11 1 2 Q 8999280 1 G momon 630250 __ G8 O 2 Phe mmo 4 _ 2 8 Sdpae 000060 1 sunman 3 _ No 0
36. high current amplification and good temperature characteristics The circuit is constructed by Q112 Q113 and D109 as a complementary circuit When the power saver is turned CPU IC801 pin 50 cuts off the 55 line intermittently to save Transmit 5V 0115 supplies T5V when pin 51 of IC801 CPU outputs LOW Receive5V 0111 supplies R5V when pin 51 of IC801 CPU outputs HIGH Fig 4 4 5 T5IR5 SWITCHING CIRCUIT MAIN UNIT When transmitting pin 51 of IC801 CPU becomes LOW Q117 is turned ON and Q116 is turned OFF Bias voltage is applied to Q114 and Q115 outputs 5V as T5V When receiving pin 51 of IC801 CPU becomes HIGH Q117 is turned OFF and Q116 is turned ON Bias voltage is applied to Q110 and Q111 outputs 5V as R5V Because Q116 applies the voltage from the 55 line R5 line voltage becomes zero reducing current consumption when the power save function is ON 4 6 CTCSS CIRCUIT MAIN UNIT IC104 is a programmable CTCSS tone decoder which generates 37 tone frequencies IC801 CPU outputs the serial data through IC103 to set the CTCSS tone frequency at IC104 through IC103 IC104 pins 3 8 S0 S5 receive data for the tone frequency When transmitting 12 of 104 becomes LOW When receiving pin 12 becomes HIGH CTCSS TONE FREQUENCIES OUTPUT FREQUENCY Hz H H
37. iation e Spurious emissions FM hum and noise Audio response RECEIVER Receiver system e Sensitivity e Squelch sensitivity Modulation acceptance 9 Intermediate frequencies e Current drain At 13 2V DC Audio output power Audio output impedance e Selectivity 2 25 kHz Spurious frequency rejection image rejection e inter modulation Hum and noise Audio response 136 174MHz 16 to 16 channels 0 0005 96 500 unbalanced OUTPUT VOLTAGE 73 13 2V Negative ground 30 C 60 22 F 140 F 65mm x 109mm x 35mm D 2 6 W x 4 3 x 1 4 D without battery pack 350g 0 771bs without battery pack 5W Variable reactance frequency modulation High power 1 8A Low power 1 2A 2 2kQ 5kHz 60dB 40dB 1dB 3dB of 6dB octave from 300Hz 3000 Hz Double conversion superheterodyne 0 28 at 1208 SINAD 0 22uV 7kHz 1st 21 8MHz 2nd 455kHz Audio max 0 25A Standby 70 EE cwm cows sow 80 7048 7048 6848 8 40dB 1dB 3dB of 6dB octave from 300Hz 3000Hz All specifications are EIA RS316B procedures SECTION 2 OUTSIDE AND INSIDE VIEWS 2 1 OUTSIDE VIEWS TOP VIEW SCAN SWITCH MONITOR SWITCH ANTENNA CONNECTOR POWER SWITCH VOLUME CONTROL CHANNEL SELECTOR TRANSMIT BUSY INDICATOR CA
38. ough the splatter filter circuit 101 R107 C108 R110 C109 R111 C111 where signals of 3kHz and above are attenuated 101 pin 7 then outputs the signals The signals are applied to D501 in the VCO circuit as signals to be modulated The signals to be modulated then change the capacitance of D501 to make an FM signal 4 2 2 DRIVE AMPLIFIER RF UNIT The output is buffer amplified at 0305 and applied to the transmit receive switching circuit D311 After passing through the transmit receive switching circuit D311 and the preamplifier Q307 the VCO out put is amplified at the drive amplifier Q306 where 20mW is obtained The voltage controlled by the APC circuit is applied to the collector of Q306 for a stable RF output power from 10302 4 2 3 RF POWER AMPLIFIER RF UNIT 1C302 is a power module which provides stable 5W output power RF signals from the drive amplifier Q306 are applied to pin 1 of 302 The amplified signals are output 5 and applied to the ANTENNA CON NECTOR through the APC detector circuit the antenna switching circuit and the low pass filter circuit from Q305 R332 DRIVE POWER OUTPUT LOW CONTROL CIRCUIT from CPU T5 Fig 2 4 2 4 2 4 APC CIRCUIT RF UNIT The APC detector circuit consists of L315 C352 C353 R324 R325 D308 and D309 When the antenna impedance is ma
39. ransistor 2SC2712 BL Diode 1SS226 Diode 1SS184 Diode 1SS184 Zener RD4 7MB3 Diode 1SS184 Diode DWA010 Diode 1SS184 Diode 1SS184 Diode 1SS190 Diode 1SS181 Zener RD5 1JS B2 RF4A3 FAC 4 194MHz Crystal Resistor MCR10 Resistor 5600 MCR10 Resistor 180kQ MCR10 Trimmer RH04A3AN5J Resistor 180kQ 10 Resistor 1kQ MCR10 Resistor 180kQ MCR10 Resistor 120kQ MCR10 Resistor 220 MCR10 Resistor MCR10 Resistor MCR10 Resistor 1 2kQ 10 Resistor 3 9kQ MCR10 Resistor 390kQ MCR10 Resistor 1 MCR10 Trimmer 47 RH04A3AS4J Resistor 15 MCR10 Trimmer 330kQ RHO4A3AN5J Resistor 100 10 Resistor 27kQ MCR10 Resistor 47kQ MCR10 Resistor 1kQ MCR10 Resistor 47kQ MCR10 Resistor 56 MCR10 Resistor MCR10 Resistor 270 MCR10 Resistor 5 6 MCR10 Resistor 47kQ MCR10 Resistor 47kQ MCR10 Resistor 1 MCR10 MAIN UNIT DESCRIPTION PART NO Resistor 1 8 MCR10 Resistor 150 MCR10 Resistor 8200 MCR10 Resistor 6 8kQ MCR10 Resistor 1 5MQ MCR10 Resistor 470kQ MCR10 Resistor MCR10 Resistor MCR10 Resistor 1MO MCR10 Resistor MCR10 Resistor 12kQ MCR10 Resistor 3300 MCR10 Resistor 12kQ MCR10 Resistor 1 2kQ MCR10 Resistor 10kQ MCR10 Resistor 4700 MCR10 Resistor 47 MCR10 Resistor 56 MCR10 Resistor 47kQ MC
40. ring range 0 5kHz Connect the FM deviation meter to the ANTENNA CONNECTOR via the attenuator the ANTENNA CONNECTOR via the attenuator deviation DEVIATION Tone encoder programmed channel if programmed Apply AF signal to the EXT MIC JACK Tranmitting 2 Output ___ PEE R353 adjustment MAIN UNIT UNIT LOCATION Deviation adjustment R118 CTCSS deviation adjustment 7 BOARD LAYOUTS 7 1 INTERCONNECTION POWER SWITCH CHANNEL to DTMF UNIT VOLUME CONTROL SELECTOR OPTIONAL EF UNIT B 1704B EF UNIT 93 B 1703A B 1705B MAIN UN 8 1665 UNIT 8 17028 BATTERY Low rwur r7n 5 AF UNIT ONAL J101 J102 SPEAKER UNIT MAIN UNIT B 1665C 501 UNIT 8 16698 RF UNIT 8 16666 16640 T3 B 1670B p ooog FILTER UNIT B 1596B 71 Ed CLONE SWITCH Eejerr psc sv csre para 7 2 LOGIC AND EF UNITS LOGIC UNIT S 8054ALB LM T 10802 1 015 389 07530606 202 EF UNIT VOL LED DS DS2 P2 to LOGIC UNIT EF UNIT 1 B 1
41. rolytic 10uF 16 Tantalum 2 20F TEMSVA1C225M 8L Ceramic 0 001uF GRM40 Electrolytic 1pF 50 3 Tantalum 1pF 16 SV Ceramic 0 001uF GRM40 Ceramic 0 1pF GRM40 F Ceramic 0 0068uF 0 Ceramic 0 0047nF GRM40 Ceramic 0 01uF GRM40 F Electrolytic 47uF 63 RC3 Ceramic 0 1pF GRM40 F Ceramic 0 001uF GRM40 Ceramic O 1uF GRM40 Ceramic 0 001uF GRM40 Tantalum 0 47uF TEMSVA1V474M 8L Ceramic 0 001uF GRM40 Electrolytic 10pF 16 3 Ceramic 0 001uF 40 0 1pF GRM40 F Ceramic 0 01uF GRM40 F Electrolytic 22uF 16 RC3 Ceramic 18pF GRM40 CH Ceramic 18pF GRM40 CH Ceramic 0 001uF GRM40 Electrolytic 47uF 6 3 Ceramic 0 167 GRM40 0 001uF 0 Electrolytic 22 16V 3 Electrolytic 4 6 3 3 Electrolytic 4 6 3 3 0 001 GRM40 470pF GRM40 Ceramic 0 001uF 0 Electrolytic 22 16V 3 Electrolytic 47 16 5 0 001uF GRM40 Tantalum 3 3uF 6 3V SV Tantalum 0 47uF 35V DN Ceramic 0 1uF GRM40 F Ceramic 0 0047uF GRM40 Tantalum 47 16V DN 470pF GRM40 Ceramic 0 001uF 0 0 01uF GRM40 F Ceramic 0 01uF GRM40 F Ceramic 0 001uF 0 0 001 _ GRM40 0 001uF 0 0 1pF GRM40 F 28 05 28 04 HSJ 1102 01 540 HSJ 0836 01 010 Connector Connector Connector Connector PI28A04F BBO4A03F BBO4A04F BBO4A09F Connector Connector
42. tched at 500 the voltage detected at D308 and D309 is at a minimum The voltage detected at D308 and D309 is applied to the differential amplifier Q308 0309 reference voltage is applied to the base of Q309 When the antenna impedance is mismatched the base voltage of Q308 is higher than the reference voltage The collector voltage of Q308 decreases Q311 amplifies the current from the differential amplifier which controls Q312 and Q320 changing the supply voltage to Q306 and IC302 This decreases the output power of the drive amplifier Q306 and power amplifier IC302 until the base voltage of Q308 becomes equal to the base voltage of Q309 4 2 5 POWER OUTPUT CONTROL CIRCUIT RF UNIT The power output contro circuit consists of R349 R353 This circuit controis the RF output power with the APC reference voltage When HIGH output power is selected RF output power can be adjusted with R353 When LOW output power is selected the signal for low power selection from the 801 is applied to R352 through the LOW signal line RF output power is adjusted with R352 4 2 6 TX MUTE CIRCUIT RF UNIT TMUT signal from the CPU 801 turns Q313 OFF Bias voltages to Q307 Q306 1 302 are cut off stopping transmission R351 R350 APC CIRCUIT 4 27 SWITCHING CIRCUIT When transmitting 0310 0307 0310 turned 1310 and C33
43. uelch UN lt adjustment Cox i g 22 6 3 TRANSMITTER ADJUSTMENT TEST INSTRUMENTS REQUIRED 1 AC POWER SUPPLY Output voltage 13 2V DC Current capacity or more MEASUREMENT CONNECTION LOCATION AF GENERATOR FM 2 RF POWER METER TERMINATED TYPE DEVIATION Measuring range 1 10W METER Frequency range 120 180 MHz Impedance 500 ATTENUATOR SWR Less than 1 2 1 VOLTMETER more than to EXT MIC JACK 3 AF GENERATOR AG Frequency range 200 2000 Hz e Output level 0 200mV RF POWER METER POWER SUPPLY to BATTERY TERMINAL to ANTENNA CONNECTOR MEASUREMENT AUN ADJUSTMENT ADJUSTMENT CONDITIONS UNIT LOCATION UNIT ADJUST OUTPUT Select any channel Top Connect the RF POWER Transmitting panel power meter to the ANTENNA CONNECTOR CHANNEL SELECTOR 1 5W Low power channel if programmed DEVIATION e Select any channel Top Connect the FM 4 3kHz MAIN R116 e Apply AF signai to the EXT panel deviation meter to JACK 1kHz 170mV Transmitting FM deviation meter HPF OFF LPF 20kHz Symmetrical Deemphasis OFF Deviation sense P P 2 55 1 CHANNEL SELECTOR 4 MILLI VOLTMETER Measuring range 2 200 mV 5 FM DEVIATION METER Frequency minimum 2 e Measu
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