Icom IC-H6 Service Manual Download

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Summary of Contents for IC-H6

Page 1: ...VHF TRANSCEIVER IC H6 lcom Inc...

Page 2: ...EMBLY OF THE CASES 6 1 6 2 DISASSEMBLY OF UNITS 6 2 3 6 3 PTT SPRING ASSEMBLY 6 3 6 4 TOP PANEL CONSTRUCTION 6 4 6 5 UNIT BOTTOM ASSEMBLY 6 5 SECTION 7 MAINTENANCE AND ADJUSTMENT 7 1 9 7 1 MEASURING I...

Page 3: ...4 Degrees F to 140 Degrees F 50 ohms unbalanced DC 8 4V with attendant power pack IC CM3 DC 7 to 12V negative ground is acceptable Transmitting At 2 5 watts output Approx 700mA Receiving At max audio...

Page 4: ...DICATOR CHANNEL SELECT SWITCH d ANTENNA CONNECTOR j EXTERNAL MIC JACK EXTERNAL SPEAKER JACK FRONT PANEL PUSH TO TALK PTT 4 SWITCH SPEAKER MICROPHONE 2 1 SQUELCH CONTROL VOLUME CONTROL and POWER SWITCH...

Page 5: ...ON and the audio level increases by further rotat ing it clockwise EXTERNAL SPEAKER JACK When an external speaker or an earphone is used connect it to this jack Use a speaker with an impedance of 8 o...

Page 6: ...of the second localoscillator second mixer limiter amplifier quadrature detector and active filter circuits The second local oscillator oscillates 16 445MHz with X101 and is fed to the second mixer wi...

Page 7: ...L228 have high impedance and 0216 feeds the signals to the antenna through the low pass filter 3 3 PLL CIRCUITS 3 3 1 LOCAL OSCILLATOR CIRCUIT The crystal oscillator 0206 oscillates 35 77625MHz with...

Page 8: ...es in 70 80MHz range The oscillator frequency is controlled by a DC voltage which is supplied from the loop filter to varactor diode D203 In the receive mode R 6V is applied to D204 s anode through L2...

Page 9: ...by diodes programmed into the board then fed to IC201 to determine an operation frequency When duplex transmit function is required calculate each N value for transmit frequency and receive frequency...

Page 10: ...048 x 5 0107 108 110 2SC2458 x 3 L t T T6V R6V X101 16 445MHz Buffer Amp Driver 0211 0212 2SC383 2SC2053 7 Crystal X202 R l Switch H X203 T 9 i D210 D212 1SS53 x 3 Refer to page 3 4 I Buffer Amp Buffe...

Page 11: ...der X201 5 12MHz Reference Frequencv Crystal L217 L218 RX LO Band Pass Filter 1c101 MC3357 IF Circuit IC L107 Quadrature Coil Fl102 l455KHz Ceramic FHterl X101 16 445MHz 2nd LO Crystal C291 PA Output...

Page 12: ...ews on the rear panel and four screws on the bottom as shown in the figure 3 Remove the front panel as shown in the figure At this time be sure not to damage the engaged parts at the top circled with...

Page 13: ...n frequencies channels remove the rear panel then unplug the connectors between the matrix board and PLL board and tilt the matrix board as shown in the figure When you wish to remove the matrix board...

Page 14: ...T PRINTED SIDE CONTACT HOLDER __ CONTACT SPRING 41737 41750 6 3 PTT SPRING ASSEMBLY HOW TO REPLACE PTT SPRING 1 The PTf spring is soldered at its top as shown in the figure 2 Remove the old spring by...

Page 15: ...KNOB N 56 42037 i i VR NUT A I T 42061 I b TOP PANEL 30282 i CHASSIS A B 30284 WASHER R2 SOL K12141014 5N1212 10KB KNOB N 55 i 42036 2 5ql NUT 13 5ql NUT j b TOP PANEL VRNUT B I 42061 f T_o_P_P_A_N_E...

Page 16: ...s shown Remove the contact spring by removing the two screws as shown 3 Set the new contact spring so that the split of the spring is on the positive side and the other end on the negative side 4 Tigh...

Page 17: ...REQUENCY RANGE OUTPUT VOLTAGE 50Krl Volt or better MEASURING RANGE FREQUENCY RANGE MEASURING RANGE MEASURING RANGE FREQUENCY RANGE IMPEDANCE SWR OUTPUT FREQUENCY OUTPUT VOLTAGE DISTORTION FREQUENCY RA...

Page 18: ...set the SOL control fully counterclockwise 3 Connect the RF output of a VHF signal generator to the ANT connector 4 Adjust the VOL control and the AF voltmeter range Adjust the VOL control for a full...

Page 19: ...e collector base and emitter of each transistor 9 When checking a transmission problem it is convenient to short circuit an accessory mic connector plug and insert it turning on the transmitter 7 4 HO...

Page 20: ...ormal RF is present and it is not possible to measure the DC voltage accurately with a voltmeter E F G 7 4 3 MODULATION 17 9 Z09lD1 i iJ E 210 iii ill o M 1 Put a signal into the EXT MIC connector 1KH...

Page 21: ...2 5KHz 5Vp p squarewave is not observed at B measure DC voltage on Pin 5 of IC203 if no oscillation 3 Wave measure the output of C and D with an oscilloscope 4 Measure DC voltage of 0201 0202 0203 020...

Page 22: ...repeat adjustment of L215 L216 several times After that confirm the following voltage of R205 both transmission and receiving about 2V at a low edge channel and 4V at a high edge channel and that the...

Page 23: ...C286 C290 and C291 for maximum power output while pushing PTT switch If the total current drain exceeds 1000mA adjust C291 to set the current at 1OOOmA and repeat above procedures 3 Confirmation More...

Page 24: ...218 for maximum output on an RF voltmeter attached to R257 Then set the channel select switch at a high edge frequency channel and adjust L217 and L218 with the same procedure Repeat above procedures...

Page 25: ...ponse Connect a speaker and millivoltmeter to the EXT SP Connect a 50 ohm dummy load to the antenna terminal All receiver spurious should be supressed less than 3dB over entire frequency range E Recei...

Page 26: ...BOARD LAYOUT MAIN UNIT rn 2 rn_ rn g i 7 2 f ft 2 9 o f o 0 0 0 0 0 UQ u 0 uQw UQU 0 u w 0 0 2 u 0 CXl 0 8 1...

Page 27: ...BOARD LAYOUT PLL UNIT u w 0 m f q G i f t ij 0 1 l 8 2 a lClW II J 0 r 0 0 J...

Page 28: ...Oil N40 NlO TX CHfl I 1x c ist lX CH I lx Cu 3t lX CH1 I 1X CHl RX CHS I RX CHS I RX CH I Ax CH3 I RX CH I RX cuI I 8 3 N8 N N4 N RECflVI 0NI Y 0 a a 0 0 0 0 ID 0 0 0 ID 1 CH rx 1 rx Oi 3 rx c 7 CH6 C...

Page 29: ...ontrol 0116 8 0 0 8 4 8 0 0 17 4 8 4 T R Switch SOL Closed Opened 0117 0 6 8 4 1 7 0 6 8 4 1 7 Regulator 0118 7 7 6 0 8 4 I 7 7 6 0 8 4 Regulator I 0119 0 6 6 0 I GND 0 6 7 4 GND Regulator 0120 0 6 0...

Page 30: ...0 0 10 3 0 GND PLL IC203 1 4 2 5 2 5 6 0 3 0 GND 6 0V or OV depending on the diode matrix programming IN RECEIVE MODE PIN No UNIT IC No REMARKS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 MAIN IC101...

Page 31: ...r i T Locked T Unlocked SEND LJ t t R6V 0 vcc N 0 0 7 5nS 7 2nS r Z 200mVP P MUTEv _J SPJ SP SPE EXT MIC IN MIC PTT E LED SIOI PTT 0118 u N t l l l u u u Qlll l 0 Rimi T DJ edGD T Unlocked f EI Rlllll...

Page 32: ...151 I u 22 tdMI ked m L L a RI07 f SQLCount T J 61nS OOmVP P Cl u 0 x N R u T G 0132 ICI0 1 12 I I R f ltJ Squelched TlG t wa u RlfJE Squelched T G Cl74 u a Ri78 __e f IV t L 0 9 3 AF OUT SOL OUT SQLI...

Page 33: ...mi J T8 0207 IJ q D IJ IJ 0 0 fl5 9VP P Locked B Unlocked 1119 D s 5 7 4 IC202 R256 m I I 0 R 8 3 R204 R206 IJ 9 0 q I l l C213 R205 1400 flSlJ6 0 VP P Rim Tiii 5 3 6 R rtJ RR i _ Ta IC203 q 0 i IJ 0...

Page 34: ...l3nS 0 4 0 2 S f _ 1OOmVP P CJ i PA _ IVP P N __ u gj R213 r5 t MUTE 0 4 0 2 S V r4VP P Sholl not be Less than 2VP P MOD E 6V R6V RI R l l T i t l T l J t uR6V RI T ig N I L230 9 4 T6V T6V vcc Output...

Page 35: ...G Battery is discharged 3 i Bad battery contacts Reverse polarity of batteries IC CM4 OK Opened wire between E terminal and power switch or defective power switch Check Qll7 Q119 Ql20 0104 etc of MAIN...

Page 36: ...unit NO Refer to NO POWER ON NO Check voltage of IC203 PLL unit NO YES YES Defective X201 PLL unit Defective X202 PLL unit Defective IC201 PLL unit NO but cannot resolve it Send the set to dealer or...

Page 37: ...een ANT con nector and MAIN unit YES but cannot resolve it Send the set to dealer or ICOM service center Replace the wires or resolder them Lock is failed Refer to LOCK FAILURE Defective Q208 PLL unit...

Page 38: ...d ANT connector N_o ____ Replace the wires or resolder them N_o ____ Lock is failed Refer to LOCK FAILURE NO NO NO NO Defective 0208 PLL unit Defective 0209 PLL unit Defeetive O21 2 PLL unit Defective...

Page 39: ...RIPTION RATINGS UNIT Voo Supply Voltage 10 v VIN Input Voltage 0 3 Voo o 3 v TOPR Operating Temperature 30 75 oc TSTR Storage Temperature 55 125 oc PIN CONNECTION BLOCK DIAGRAM 100 500Kfi PIN1i 1 BCD...

Page 40: ...tage VIN Input Voltage TOPR Operating Temperature TSTG Storage Temperature BWCK DIAGRAM Vee 455KHZ FILTER PIN CONNECTION LIMITER 5 INPUT DECOUPLING 8 LIMITER 7 OUTPUT DEMODU LATOR 11 2 RATINGS 12 4 to...

Page 41: ...IMUM RATINGS Ta 2S 0 C SYMBOL DESCRIPTION Yoo Supply Voltage VIN Input Voltage TOPR Operating Temperature TSTR Storage Temperature PIN CONNECTION I ODDDDODDO I I I N Q 0 Q x x Q 0 z 0 0 0 0 x BA 526 7...

Page 42: ...Fl101 Fl102 X101 L101 L102 L103 L104 L105 L107 R101 R102 R103 R105 R106 R107 R108 R109 R110 R111 R112 R113 R114 R115 R116 R117 R118 R119 R120 R122 R123 R124 R125 R126 R127 R128 R129 R130 R131 R132 R13...

Page 43: ...R10 4F C144 Electrolytic 100 F 10V MS9 4B R166 Resistor 2 2KS1 J ELR10 4F C145 Electrolytic 47 F 10V MS9 4A R167 Resistor 22KS1 J ELR10 4F C146 Electrolytic 100 F 10V MS9 4B R168 Resistor 1KS1 J ELR10...

Page 44: ...de 1S1555 3F R242 Resistor 10KS1 J ELR10 4G R243 Resistor 150 1 J ELR10 4F X201 Crystal 5 12000MHz HC 18 T 2F R244 Resistor 470 1 J ELR10 4G X202 Crystal HC 18 T 2C R245 Resistor 27 1 J ELR10 4F X203...

Page 45: ...0 001 F 50V 1C C252 Ceramic 56pF 50V 1C REF DESCRIPTION PART NO BOARD NO LOCATION C253 Ceramic 22pF 50V 1C C254 Ceramic 47pF 50V 2C R401 Resistor 100KD J R10 1E C255 Ceramic 0 001 F 50V 2C R402 Resist...

Page 46: ...I UJ I ID II u g 0 0 0 9SIS7 J 017 L _______ _J Cl JJ _J 0 z o 9zo N N u c a JJ f x w 0 UJ E E f x w IU 9Pl Y I I I I I I I I I I I I L_...

Page 47: ...R c b ru n u t rv 1 u t r i A _ C 66 PIE n I ii l i 0 C 65 0 004 I I o I I o I I I c oc I 1 I R 63 I rl _ CZ 5 3 3 1 i __z7z 9P 2 0 c CZ 4 0 01 2i 00 0 C300470P n J LJ OR z c Rl 50 330 Rl4B R232 Z ZO...

Page 48: ...AC BATTERY CHARGER CM 30 MAINTENANCE MANUAL...

Page 49: ...45mA for IC CM4 Nickel Cadmium inserted 0 C 45 C for IC CM3 and IC CM4 10 C 40 C for IC CM2 and IC CM5 72mm H x 172mm W x 104mm D Approx 1 0kg 4 Insertion slot for battery packs When the charger is c...

Page 50: ...e cover of the unit as shown in the figure 2 Remove the cover from the chassis with taking care to donot make damage to the internal wirings as shown When you wish to remove the PC Board remove the fo...

Page 51: ...d by reverse voltage Thus when the full wave rectified voltage becomes less than 9V D portion in the figure the SCA will be turned off Rated charging current is decided by R37 R42 R37 R42 are selected...

Page 52: ...er When the battery pack is removed from the charger S5 is turned off and Pin 5 of IC1 is grounded through S5 This resets the flip flop for another charging When charging IC CM4 inserted nickel cadmiu...

Page 53: ...I Phase Angle Control Gate r 1 4 IC2 PD4011 T 1 Logic Circuit _ 011 012 2SC1740 x 2 _ IC1 3 4 IC2 _ uPD4011 A 5 Current Control D6 2P1M Gate Pulse Generator r 03 2SA1015 04 2SC1710 I I I Ga ging Curre...

Page 54: ...R3 C2 R RI 1 4 Q5 Q6 RIS R 4 R Rl7 C 4 R 2 Cl IC CM3 IC CNl S c M4 I 01 01 01 01 i 1 Cl I J I o in I o I o I QIO R30 R71 rc3 R23 R2S Dll I I I I I I I I 9 r 1 R L 53 25Mll 54 4S A SS 61J A __________...

Page 55: ...1 0 44 0 42 QlO 0 7 6 GND 0 75 0 1 GND 0 74 0 1 GND 0 75 0 1 GND Qll 0 9 0 GND 0 65 0 1 GND 0 65 0 1 GND 0 8 9 GND Ql2 0 9 0 GND 0 9 0 GND 0 9 0 GND 0 65 0 1 GND IC IC Condition PIN NO NO 1 2 3 4 5 6...

Page 56: ...lSlSSS C6 Ceramic 0 0047 Dll Diode lSlSSS C7 Ceramic 0 0047 D12 LED LD 002R C8 Ceramic 470P D14 Diode lSlSSS C9 Barrier Lay 0 047 ClO Ceramic 470P L1 Choke LW 16 C11 Ceramic 470P L2 Choke LW 9 Cl3 Ce...

Page 57: ...lcom Inc 6 9 16 Kamihigashi Hirano ku Osaka 547 Japan...

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