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Icom IC-78, Service Manualvice Man

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Icom IC-78 Service Manualvice Man Download Page 21

5 - 7

CP3701

CW carrier
check point

R3703

CW carrier
adjustment

R1730

AM carrier
adjustment

R2321

AM modulation adjustment
(or AM carrier pre-setting)

AM modulation adjustment
(or AM carrier pre-setting)

R2385

R2303

Carrier suppression
adjustment

• MAIN unit

Summary of Contents for IC-78

Page 1: ...S 13707MZ C1 2000 Icom Inc 1 1 32 Kamiminami Hirano ku Osaka 547 0003 Japan Count on us HF TRANCEIVER iC 78 iC 78 UP IC 78 ...

Page 2: ...e and unit name 4 Quantity required SAMPLE ORDER 1110004080 S IC µPC2709T IC 78 MAIN UNIT 1 piece 8810009130 Screw PH B0 M3 12 NI ZU IC 78 CHASSIS 6 pieces Addresses are provided on the inside back cover for your convenience INTRODUCTION This service manual describes the latest service information for the IC 78 HF TRANSCEIVER at the time of publication Commercial Commercial w alarm Marine Marine w...

Page 3: ...N BEFORE SERVICING 5 1 5 2 PLL ADJUSTMENT 5 2 5 3 TRANSMITTER ADJUSTMENTS 5 4 5 4 RECEIVER ADJUSTMENTS 5 8 5 5 SET MODE ADJUSTMENT 5 10 SECTION 6 PARTS LIST SECTION 7 MECHANICAL PARTS AND DISASSEMBLY SECTION 8 SEMI CONDUCTOR INFORMATIONS SECTION 9 BOARD LAYOUTS 9 1 MAIN UNIT 9 1 9 2 PA UNIT 9 3 9 3 PLL UNIT 9 3 9 4 LOGIC UNIT 9 5 9 5 PHONE BOARD 9 5 9 6 MIC BOARD 9 5 9 7 VR BOARD 9 5 9 8 SENSOR BO...

Page 4: ...em SSB Balanced modulation AM Low level modulation Output power SSB CW RTTY FM 2 100 W AM 2 40 W Spurious emission Less than 46 dB below peak out put power spurious frequency below 30 MHz 50 dB above 30 MHz 60 dB Carrier suppression More than 40 dB Unwanted sideband suppression More than 50 dB Mic connector 8 pin connector 600 Ω KEY connector 3 conductor 6 5 d mm 1 4 SEND connector Phono RCA ALC c...

Page 5: ...O DDS IC2 SC 1287 Rx 1st IF amplifier Q1201 3SK131 2nd mixer circuit D401 HSB88WSTR Rx 455 kHz Tx 64 455 kHz Predrive amplifier Q1 2SC1971 Tx Rx switching relay RL13 AG201344 Drive amplifier Q2 Q3 2SC3133 Power amplifier Q4 Q5 2SC2904 Tx 1st IF amplifier Q151 2SK882 MIC amplifier IC2201 µPC5023 Balanced modulator Tx 455 kHz Modulator IC2301 NJM1496V USB LSB CW RTTY filter FI611 FL 65 Rx 2nd IF amp...

Page 6: ...moving the Front unit and PA cover Remove 4 screws from the front panel Remove 5 screws from the PA cover How to connect the coaxial cable Connect the coaxial cable as shown below J6 J3 to MAIN unit PA unit FILTER unit J1 J701 PA cover FRONT panel MAIN unit PLL unit J3 from FILTER unit J6 from PA unit J701 J1 ...

Page 7: ...ies The filtered signals are then applied to the pre amplifier circuit 3 2 0 30 0 MHz The signals pass through a high pass filter L811 L814 C811 C817 to suppress excessively strong signals below 2 0 MHz such as from broadcasting stations The filtered signals are applied to a low pass filter or one of 5 bandpass filters depending on their frequencies and are then applied to the pre amplifier circui...

Page 8: ...ied to the noise AGC circuit Q1504 Q1505 R1514 R1516 C1512 to control the bias voltage of the noise amplifier Q1501 Q1502 The threshold level of the noise blanker switch Q1508 is set at 0 9 V When the detected voltage exceeds the thresh old level Q1509 outputs a blanking signal to close the noise blanker gate D1301 D1302 depending on the pulse noise period When the operating frequency is changed t...

Page 9: ...W or RTTY mode to obtain a fast AGC release time While in SSB or AM mode C1803 C1805 R1808 and C1802 R1807 are connected in parallel to obtain a appropriate AGC characteristics middle or slow AGC release time respectively 4 1 14 S METER CIRCUIT MAIN UNIT The S meter circuit indicates the relative received signal strength while receiving by utilizing the AGC voltage which changes depending on the r...

Page 10: ...er is not used in transmitting The amplified signal from Q502 is mixed with the 2nd LO signal and converted to a 64 455 MHz IF signal at D401 D401 is used in receiving and transmitting The AM signal bypasses FI611 and is amplified at Q502 and is then applied to D401 The 64 455 MHz IF signal is filtered at FI301 and amplified at the IF amplifier Q151 and is then converted into the dis played freque...

Page 11: ...ecting the voltage ICH and ICL which appear at both terminals of a 0 012 Ω resistor PA unit R25 The detected voltage is applied to the differential amplifier IC1701a pins 2 3 When the current of the final transistors is more than 22 A IC1701a controls the ALC line via D1705 to prevent excessive current flow 4 2 9 TEMPERATURE PROTECTION CIRCUIT MAIN UNIT A cooling fan CHASSIS MF1 is activated while...

Page 12: ... X1 A 32 00 MHz reference frequency is oscillated to produce a 2nd LO signal DDS reference frequency and BFO DDS clock signal The 32 00 MHz reference frequency is doubled at Q10 to obtain the 2nd LO signal The resulting 64 00 MHz signal is filtered at the bandpass filter and is then applied to the MAIN unit via J1 as the 2nd LO signal 4 4 LOGIC CIRCUITS 4 4 1 BAND SELECTION DATA MAIN UNIT To selec...

Page 13: ...ignal for the optional antenna tunner Input port for transmit control signal from the optional antenna tunner CPU AVXL SEN1 SEN2 CON0 CON2 DRES PCK PDAT DSTB PSTB BSTB FSTB MSTB P55 P56 SQLS ALMS MCK MDAT STAT KEY Pin Port Description number name LOGIC unit IC1 60 61 62 63 70 71 77 79 80 81 82 85 86 87 88 90 91 92 93 95 96 97 98 99 100 Outputs chip select signal for EEP ROM IC2 Input port for seri...

Page 14: ...V line and converted by the 5V DC DC converter circuit IC3501 D3502 The voltage is applied to the AGC Q1805 D1803 ALC IC1701 and AF selector IC2102 etc 8 V for transmitter circuits converted from the 8 V line and regulated by the PAT8 regulator circuit IC3005 13 V for transmitter circuits converted from the 14 V line using TX signal and regulated by the T13V regulator circuit Q3801 Q3802 The volt ...

Page 15: ...30 MHz Measuring range 0 100 Frequency range 1 kHz 10 Measuring range 1 100 Frequency range DC 20 MHz Measuring range 0 01 10 V Imput impedance 10 MΩ DC or beter Frequency range At least 90 MHz Spectraum bandwidth 100 kHz or more Frequency range 0 1 100 MHz Output level 0 1 µV 32 mV 127 to 17 dBm Measuring range 10 mV 10 V Input impedance 50 kΩ V DC or better Measurement capability 1 A and 30 A Fr...

Page 16: ...quency 14 10000 MHz Mode USB Receiving Mode AM Receiving PLL PLL PLL PLL PLL Connect a frequency counter to check point P1 Connect an RF volt meter to check point P1 Connect a digital multimeter or oscillo scope to check point CP1 Connect an RF volt meter to check point P4 Connect an RF volt meter to check point P1 Connect an RF volt meter to check point P5 Connect a frequency counter to check poi...

Page 17: ...1 2 1 2 P3 C7 C6 Reference OSC level adjustment P1 Reference frequency check point C16 Reference frequency pre setting P4 1st LO output level check point P5 BFO check point C165 VCO lock voltage adjustment L4 Reference freauency adjustment PLL unit ...

Page 18: ...onnect an audio generator to MIC connector and set as Frequency 1 5 kHz Level 30 mVrms Transmitting Display frequency 3 55000 MHz Mode USB Connect CP4002 MAIN unit to GND RF power Maximum H Mic gain Center 50 Connect an audio generator to MIC connector and set as Frequency 1 5 kHz Level 30 mVrms Transmitting PA Rear panel FILTER Rear panel Rear panel Rear panel Connect an ammeter 3 A between power...

Page 19: ... Tx total gain adjustment L106 R503 L501 L303 L302 L301 R1720 Ic APC adjustment R2701 Tx total gain pre setting R21 Idling current adjustment Driver R24 Idling current adjustment Final J5 SWR detector check point J4 SWR detector pre setting C17 SWR detector adjustment PA unit FILTER unit MAIN unit ...

Page 20: ...m H Mic gain Center 50 R2385 MAIN unit 9 o clock Connect an audio generator to MIC connector and set as Frequency 1 kHz Level 30 mVrms Transmitting Set an AG as Frequency 1 kHz Level 3 mVrms Transmitting Display frequency 12 23000 MHz Mode CW RF power Maximum H Connect a keyer to the KEY jack Key down transmitting Rear panel Rear panel Rear panel MAIN Connect a spectrum analyzer to the ANT connect...

Page 21: ...eck point R3703 CW carrier adjustment R1730 AM carrier adjustment R2321 AM modulation adjustment or AM carrier pre setting AM modulation adjustment or AM carrier pre setting R2385 R2303 Carrier suppression adjustment MAIN unit ...

Page 22: ...o ANT connector and set as Frequency 14 10150 MHz Level 1 0 µV 107 dBm Modulation OFF Receiving P AMP OFF ATT OFF Set an SSG as Level 1 0 mV 47 dBm and OFF Receiving Display frequency 14 10000 MHz Mode USB P AMP ON NB OFF Connect an SSG to ANT connec tor and set as Frequency 14 10150 MHz Level 3 2 µV 97 dBm Modulation OFF and apply following signal to ANT connector Receiving NB ON Receiving Rear p...

Page 23: ...5 9 L1621 L1614 Rx total gain adjustment L1103 L1202 L1201 R2701 Rx total gain pre setting L1501 CP1501 Noise blanker check point L1502 Noise blanker adjustment MAIN unit ...

Page 24: ...wer meter to ANT con nector Connect an audio generator to MIC jack and set as Frequency 1 5 kHz Level 30 mVrms 1 1 2 1 2 3 1 1 1 2 3 1 Push SET key to enter the RX set ting Or push UP key to skip the set mode adjustment for RX Push and hold SET key to set the volume center positions Verify the display shows GooD then push UP key to enter the S METER adjustment Push SET key to set the S0 level Push...

Page 25: ...d or power meter to ANT connector Connect a 100 Ω dummy load or power meter to ANT connector 1 2 Transmit using an external PTT switch to set SWR reference level after pushing SET Transmit using an external PTT switch to set SWR2 level after push ing SET The display returns to the same as the set mode adjustment for TX ...

Page 26: ...CC 322513 T L103 6200003950 S COIL HF50ACC 322513 T L104 6200003950 S COIL HF50ACC 322513 T R1 7030003800 S RESISTOR ERJ3GEYJ 105 V 1 MΩ R2 7030003600 S RESISTOR ERJ3GEYJ 223 V 22 kΩ R3 7030003560 S RESISTOR ERJ3GEYJ 103 V 10 kΩ R4 7030003560 S RESISTOR ERJ3GEYJ 103 V 10 kΩ R5 7030003560 S RESISTOR ERJ3GEYJ 103 V 10 kΩ R7 7030003600 S RESISTOR ERJ3GEYJ 223 V 22 kΩ R8 7030003560 S RESISTOR ERJ3GEYJ...

Page 27: ...kΩ R191 7030003440 S RESISTOR ERJ3GEYJ 102 V 1 kΩ R193 7030003360 S RESISTOR ERJ3GEYJ 221 V 220 Ω R195 7030003640 S RESISTOR ERJ3GEYJ 473 V 47 kΩ R196 7030003640 S RESISTOR ERJ3GEYJ 473 V 47 kΩ R197 7030003480 S RESISTOR ERJ3GEYJ 222 V 2 2 kΩ R198 7030003480 S RESISTOR ERJ3GEYJ 222 V 2 2 kΩ R199 7030003430 S RESISTOR ERJ3GEYJ 821 V 820 Ω R201 7030003440 S RESISTOR ERJ3GEYJ 102 V 1 kΩ R211 70300036...

Page 28: ...ANSISTOR DTC114EE TL Q511 1590002310 S TRANSISTOR DTC114EE TL Q701 1590002310 S TRANSISTOR DTC114EE TL Q1001 1510000510 S TRANSISTOR 2SA1576A T106R Q1002 1590002310 S TRANSISTOR DTC114EE TL Q1101 1560000640 S FET 2SK1740 TA Q1102 1560000640 S FET 2SK1740 TA Q1103 1560000640 S FET 2SK1740 TA Q1104 1560000640 S FET 2SK1740 TA Q1201 1580000620 S FET 3SK131 T2 MAS Q1301 1580000620 S FET 3SK131 T2 MAS ...

Page 29: ...IL LS 483A C 14924 L151 6150004280 COIL LS 484B C 14927 L152 6200003260 S COIL NL 322522T 101J L153 6200003550 S COIL MLF1608A 4R7K T L201 6200001830 S COIL NL 322522T 100J L202 6200003000 S COIL NL 322522T R22J 3 L301 6150005110 COIL LS 540 L302 6150004270 COIL LS 483A C 14924 L303 6150005110 COIL LS 540 L401 6140003210 S COIL LR 358 L402 6140003530 COIL LR 395 L501 6150004090 COIL LS 469 C 13969...

Page 30: ...632 7030003530 S RESISTOR ERJ3GEYJ 562 V 5 6 kΩ R633 7030003440 S RESISTOR ERJ3GEYJ 102 V 1 kΩ R634 7030003320 S RESISTOR ERJ3GEYJ 101 V 100 Ω R635 7030003560 S RESISTOR ERJ3GEYJ 103 V 10 kΩ R701 7030009830 S RESISTOR ERJ12YJ391U 390 Ω R703 7030006250 S RESISTOR ERJ12YJ271U 270 Ω R704 7030009830 S RESISTOR ERJ12YJ391U 390 Ω R705 7030006260 S RESISTOR ERJ12YJ471U 470 Ω R801 7030003400 S RESISTOR ER...

Page 31: ... 7030003480 S RESISTOR ERJ3GEYJ 222 V 2 2 kΩ R2101 7030003400 S RESISTOR ERJ3GEYJ 471 V 470 Ω R2102 7030003560 S RESISTOR ERJ3GEYJ 103 V 10 kΩ R2103 7030003560 S RESISTOR ERJ3GEYJ 103 V 10 kΩ R2104 7030003640 S RESISTOR ERJ3GEYJ 473 V 47 kΩ R2105 7030003640 S RESISTOR ERJ3GEYJ 473 V 47 kΩ R2106 7030003640 S RESISTOR ERJ3GEYJ 473 V 47 kΩ R2107 7030003640 S RESISTOR ERJ3GEYJ 473 V 47 kΩ R2108 703000...

Page 32: ... CERAMIC C1608 CH 1H 820J T A C100 4030007120 S CERAMIC C1608 CH 1H 820J T A C101 4030007110 S CERAMIC C1608 CH 1H 680J T A C102 4030007090 S CERAMIC C1608 CH 1H 470J T A C103 4030007150 S CERAMIC C1608 CH 1H 151J T A C104 4030007050 S CERAMIC C1608 CH 1H 220J T A C105 4030007120 S CERAMIC C1608 CH 1H 820J T A C106 4030008650 S CERAMIC C1608 JB 1H 332K T A C107 4030008470 S CERAMIC C1608 JB 1H 272...

Page 33: ...104KT N C1504 4030011600 S CERAMIC C1608 JB 1C 104KT N C1505 4030011600 S CERAMIC C1608 JB 1C 104KT N C1507 4030011600 S CERAMIC C1608 JB 1C 104KT N C1508 4030010760 S CERAMIC C1608 CH 1H 331J T A C1509 4030011600 S CERAMIC C1608 JB 1C 104KT N C1510 4030011600 S CERAMIC C1608 JB 1C 104KT N C1511 4030011340 S CERAMIC C1608 CH 1H 471J T A C1512 4510004440 S ELECTROLYTIC ECEV1HA010SR C1513 4510004640...

Page 34: ...104KT N C4101 4030006880 S CERAMIC C1608 JB 1H 472K T A C4102 4030006880 S CERAMIC C1608 JB 1H 472K T A C4103 4030006880 S CERAMIC C1608 JB 1H 472K T A C4104 4030006880 S CERAMIC C1608 JB 1H 472K T A C4105 4030006880 S CERAMIC C1608 JB 1H 472K T A C4106 4030006880 S CERAMIC C1608 JB 1H 472K T A C4107 4030006880 S CERAMIC C1608 JB 1H 472K T A C4200 4030006880 S CERAMIC C1608 JB 1H 472K T A C4201 40...

Page 35: ...522T 220J L46 6200003150 S COIL NL 322522T 180J L47 6200001830 S COIL NL 322522T 100J L48 6200003040 S COIL NL 322522T R68J 3 L49 6200004470 S COIL MLF1608D R12K T L50 6200004470 S COIL MLF1608D R12K T R2 7030003320 S RESISTOR ERJ3GEYJ 101 V 100 Ω R3 7030003480 S RESISTOR ERJ3GEYJ 222 V 2 2 kΩ R4 7030003400 S RESISTOR ERJ3GEYJ 471 V 470 Ω R5 7030003320 S RESISTOR ERJ3GEYJ 101 V 100 Ω R6 7030003560...

Page 36: ...RAMIC C1608 JB 1H 472K T A C23 4030009500 S CERAMIC C1608 CH 1H 0R5B T A C24 4030007030 S CERAMIC C1608 CH 1H 150J T A C25 4030007400 S CERAMIC C1608 PH 1H 121J T A C26 4030007130 S CERAMIC C1608 CH 1H 101J T A C27 4030006880 S CERAMIC C1608 JB 1H 472K T A C28 4030006880 S CERAMIC C1608 JB 1H 472K T A C29 4030006880 S CERAMIC C1608 JB 1H 472K T A C30 4030006880 S CERAMIC C1608 JB 1H 472K T A C31 4...

Page 37: ...U 100 Ω R21 7310003750 TRIMMER EVN 2ACA00 B52 501 R22 7030006130 S RESISTOR ERJ1WYJ100U 10 Ω R23 7030009220 S RESISTOR ERJ12YJ561U R24 7310003240 TRIMMER EVN 2ACA00 B23 202 R25 7100000640 RESISTOR 5 SI 0 012 Ω J R26 7030003440 S RESISTOR ERJ3GEYJ 102 V 1 kΩ R27 7030003440 S RESISTOR ERJ3GEYJ 102 V 1 kΩ R28 7030004040 S RESISTOR ERJ3GEYJ 4R7 V 4 7 Ω R29 7030003420 S RESISTOR ERJ3GEYJ 681 V 680 Ω R3...

Page 38: ...8 JB 1C 473K T A C2 4030008920 S CERAMIC C1608 JB 1C 473K T A C3 4030008920 S CERAMIC C1608 JB 1C 473K T A C4 4030008920 S CERAMIC C1608 JB 1C 473K T A C5 4030008920 S CERAMIC C1608 JB 1C 473K T A C6 4030008920 S CERAMIC C1608 JB 1C 473K T A C7 4030008920 S CERAMIC C1608 JB 1C 473K T A C8 4030008920 S CERAMIC C1608 JB 1C 473K T A C9 4030006880 S CERAMIC C1608 JB 1H 472K T A C10 4030006880 S CERAMI...

Page 39: ...JS1311 RL10 6330001470 RELAY AJS1311 RL11 6330001470 RELAY AJS1311 RL12 6330001470 RELAY AJS1311 RL13 6330001330 RELAY AG 201344 J1 6510021980 CONNECTOR 10FMN BTRK J2 6510007020 CONNECTOR TMP J01X V6 J3 6510007020 CONNECTOR TMP J01X V6 J4 6910001040 CONNECTOR IPS 1136 J5 6910001040 CONNECTOR IPS 1136 W3 6910001030 JUMPER IPS 1041 4 W4 6910001030 JUMPER IPS 1041 4 W5 7030008240 S JUMPER ERJ12YJ0R00...

Page 40: ...er 1 MP2 8110007060 Top cover 2241 U cover 1 MP3 8010018020 2241 chassis 1 MP4 8930037001 1691 grounding plate 1 1 MP6 8930002900 Rubber foot A SK1912A 2 MP7 8010001520 Stand C 1 MP8 8930005790 Color foot A for stand 1 MP9 8930005800 Color foot B for stand 1 MP10 8930018520 TR clip A 1 MP11 8930018520 TR clip A 1 MP12 8810009650 Screw FH BT M3 8 NI ZU 4 MP13 8810008660 Screw PH BT M3 8 NI ZU 2 MP1...

Page 41: ...5 F MP1 F MP12 F MP11 F MP9 F MP10 F MP15 F PHONE BOARD VR BOARD SENSOR BOARD MIC BOARD LOGIC UNIT MP7 C MP18 C MP9 C MP22 C Unit abbreviations F FRONT UNIT M MAIN UNIT L LOGIC UNIT C CHASSIS PARTS FILTER UNIT PA UNIT MAIN UNIT PLL UNIT MP14 C MP14 C MP34 C MP20 C MP20 C MP15 C EP1 C J1 C MP15 C MP29 C MP3 C MP23 C MP13 C MP4 C EP2 C MP20 C MP14 C MP33 C MP34 C MP35 C EP3 C MP19 C MP25 C MP24 C MP...

Page 42: ... G 2SK2171 4 KM G S G D 3SK131 T2 MAS V11 S D G1 G2 DTC114EE TL 24 DTC114EUA 24 UN9211 TX 8A B E C UMD6N TR D6 E2 C2 C1 B2 B2 E1 DTA114EE TL 14 DTA114EUA T106 16 B E C XP4601 TX 5C XP4311 TX 7X E B C C E B E1 E2 B1 C1 C2 B2 8 1 8 2 DIODES NAME SYMBOL INSIDE VIEW NAME SYMBOL INSIDE VIEW 1SS184 B3 DAN202K N A1 C A2 1SS226 C3 1SS375 TL FH DA221 TL K MA742 M1U A1 C2 1SS355 A MA2S111 A MA2S728 B A C A ...

Page 43: ...SNDS 8V 8V HV 14V 14V FSKK MICE MIC SEND SQLS SEND SEND SEND SPS PHOE PHOE PHO PHO GND GND GND GND CIVE CIV ALMS NC KEY J4201 1 2 30 29 to LOGIC unit J7 J4401 1 2 30 29 GND GND 14V 14V 14V PAT8 HV KEY GND PWS 14V 14V ICL ICH STRT TEMP J4101 1 2 15 16 GND GND 14V 14V 14V PAT8 HV KEY GND PWS 14V 14V ICL ICH STRT TEMP 16 15 2 1 J4502 CIV CIVE SP1 SPE SPE ESPO SPO SPO SPO SPE 1 2 3 1 BLACK CHASSIS FAN...

Page 44: ...2 4 3 5 6 7 9 11 10 8 12 13 9 SPE ESPO SPO 1 2 3 4 5 6 7 8 9 10 11 12 13 EXT SP J4501 ALC J4801 ACC J4651 SEND J4801 REMOTE J5001 ELEC KEY J5101 BOTTOM VIEW MAIN UNIT The combination of this page and the previous page shows the unit layout in the same configuration as the actual P C Board ...

Page 45: ... 1 2 to MAIN unit J201 P4 P3 1LO 1LOE 1 5 10 15 16 2 J12 BROWN ORANGE RED YELLOW PA WS2 PA WS1 KEY STAR 14V GND 1 2 3 4 J6 P1 P2 W6 to MAIN unit J1 W7 J7 P4 WS2 PLL WS2 PLL WS1 P3 W8 to FILTER unit J2 W9 VARISTOR BOARD CHASSIS CHASSIS J3 to MAIN unit J4101 1 15 16 2 GND GND PWS GND 14V 14V 14V 14V ICL ICH STAR TEMP 14V PAT8 HV KEY 1 2 3 4 5 6 J1 RED RED BLACK BLACK PAI WS1 9 3 9 2 PA UNIT TOP VIEW...

Page 46: ...9 4 VARISTOR BOARD The combination of this page and the previous page shows the unit layout in the same configuration as the actual P C Board BOTTOM VIEW PLL UNIT BOTTOM VIEW PA UNIT ...

Page 47: ...J2 GND GND 1 2 3 4 5 6 7 8 9 10 AFGL GND GND RFGL RITL SFTL 5VL 5VL 5VL 5VL SHIFT RIT RF SQL AF GND GND The combination of this page and the next page shows the unit layout in the same configuration as the actual P C Board 9 5 9 4 LOGIC BOARD TOP VIEW 9 5 PHONE BOARD TOP VIEW 9 6 MIC BOARD TOP VIEW 9 7 VR BOARD TOP VIEW The combination of this page and the next page shows the unit layout in the sa...

Page 48: ...J6 STRT 5V SNDS 8V 8V HV 14V 14V FSKK MICE MIC SEND SQLS SEND SEND SEND SPS PHOE PHOE PHO PHO GND GND GND GND CIVE CIV ALMS NC KEY 29 30 1 2 GND 8V 13V DNB DSTB PDAT CON1 FSKK 1 15 2 16 J9 J1 J7 to MAIN unit J4201 to LOGIC unit J1 NC 13V 13V PSTB PCK CON2 CON0 SRST to PLL unit J3 5V SEN1 SEN2 SENSOR GND P1 4 3 2 1 E DN UP E 1 2 3 4 7 8 J1 PHONES The combination of this page and the previous page s...

Page 49: ...1 L6 L4 L2 FOR L5 REF L3 T13V GND J1 J3 P5 P6 to MAIN unit J701 W11 WS3 W10 CHASSIS J2 P4 P3 W9 WS2 to PA unit J7 W8 The combination of this page and the next page shows the unit layout in the same configuration as the actual P C Board 9 7 9 9 FILTER UNIT TOP VIEW ...

Page 50: ...The combination of this page and the previous page shows the unit layout in the same configuration as the actual P C Board 9 8 BOTTOM VIEW FILTER UNIT ...

Page 51: ...CA etc IC3301 M62352 FANV D2 D3 1SS375 2 D1 MA29B D2 D3 MA29B 2 Q6 2SD1585 15 0 22 0 M 22 0 30 0 M 2 0 4 0 M 4 0 8 0 M 8 0 15 0 M TX SW HV 13V A D MAIN DIAL RIT AF VOL SHIFT A D A D A D CI V I F RF SQL VOL IC100 7W04 CPU FRONT UNIT IC1 HD6473834H IC3006 BU4094 SERI PARA SERI PARA SERI PARA IC3001 BU4094 IC3004 BU4094 MODE DATA BPF LPF 5 REG 13V 5V IC1 TA7805 IC 3002 TD62783 IC3003 TD62783 IF FIL I...

Page 52: ... GND GND GND SPS SEND SEND SEND SNDS NC KEY DOTK DASK VOXL AVXL SML ALML REFL FORL PATL BEEP DNB RXS TXS SBSY KDS GND 1 2 3 4 5 6 7 8 9 10 J3 W3 1 2 3 4 5 6 7 8 9 10 J1 GND AFGL GND RFGL GND RITL GND SFTL GND 5VL VR BOARD MIC BOARD PHONE BOARD J1 1 2 3 4 5 6 7 8 9 10 J5 W4 W5 1 2 3 4 5 6 7 8 9 10 J4 1 2 3 4 5 6 7 8 9 10 J2 MIC MICE GND AFO SEND SQLS UD 8V W1 DSPS DSST SSTB DINT DRES ASTB MSTB FSTB...

Page 53: ...03 3SK131 R1622 2 2k R1623 560 R1624 470 R1625 470k R1626 220k C1625 0 1 C1631 0 1 D1631 DAN202K D1632 MA77 C1632 0 1 C2010 0 1 L2001 100µH C2009 10 C2008 0 1 C2007 0 1 C2006 0 0047 C2004 0 1 C2003 0 1 C2002 100p R2001 100 C2001 0 1 C1905 0 0047 D1901 1SS375 R1907 1k C1904 0 1 C1903 0 0047 L1621 LS 450 R1631 10k R1632 10k R1633 100k R2002 22k C1623 0 1 C1624 0 1 R2003 100 IFOUT 1 VCC 2 OSCIN 3 BAS...

Page 54: ...03 3SK131 R1622 2 2k R1623 560 R1624 470 R1625 470k R1626 220k C1625 0 1 C1631 0 1 D1631 DAN202K D1632 MA77 C1632 0 1 C2010 0 1 L2001 100µH C2009 10 C2008 0 1 C2007 0 1 C2006 0 0047 C2004 0 1 C2003 0 1 C2002 100p R2001 100 C2001 0 1 C1905 0 0047 D1901 1SS375 R1907 1k C1904 0 1 C1903 0 0047 L1621 LS 450 R1631 10k R1632 10k R1633 100k R2002 22k C1623 0 1 C1624 0 1 R2003 100 IFOUT 1 VCC 2 OSCIN 3 BAS...

Page 55: ...e and unit name 4 Quantity required SAMPLE ORDER 1110004080 S IC µPC2709T IC 78 MAIN UNIT 1 piece 8810009130 Screw PH B0 M3 12 NI ZU IC 78 CHASSIS 6 pieces Addresses are provided on the inside back cover for your convenience INTRODUCTION This service manual describes the latest service information for the IC 78 HF TRANSCEIVER at the time of publication Commercial Commercial w alarm Marine Marine w...

Page 56: ...S 13707MZ C1 2000 Icom Inc 1 1 32 Kamiminami Hirano ku Osaka 547 0003 Japan Count on us HF TRANCEIVER iC 78 iC 78 UP IC 78 ...

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