Yaesu FT-747 Service manual (reduced)
Contents
1. i MOD lem m U U U si MAIN UNIT F2942000 No 1xxx RECEIVE N B UNIT F2949101 No EXE m 43 Bro MEG Flop PP x3 9660666569701 for free Radioamateur cu MAIN UNIT F2942000 No 1xxx2. E 20000000 et for free by Radioamateur cu FILTER UNIT PARTS LAYOUT Component side reverse Component side obverse FILTER UNIT CIRCUIT DIAGRAM s s FILTER UNIT NB UNIT PARTS LAYOUT Component side reverse NB UNIT CIRCUIT DIAGRAM NB UNIT VOLTAGE CHART for free Radioamateur cu PARTS LAYOUT Solder side obverse DC VOLT LOCAL UNIT VOLTAGE CHART DC vOLT 02001 02002 02009 _ 02012 02013 02014 02018 02021 _ 02024 14MHz MODE USB 14MHz MODE USB for free by Radioamateur cu 2SK184Y 02019 2026 COLLEC
3. IAOW WV NN Pes od J AdOW MO ET d EET A ET ME S amp I H EHE 100w PA UNIT I I I I I I L for free by Radioamateur cu 747 is carefully designed to allow he knowledgeable operator to make all adjustments required for various station conditions modes and operator preferences simply from the controls on the front panel without opening the case of the transceiver These adjustments are described in the FT 747GX Operating Manual Ihe following procedures cover the some rimes critical and tedious adjustments that are not normally required once the transcei ver has left the factory However if damage occurs some parts subsequently be replaced realignment may be required If a sudden problem occurs during normal opera it is likely due to component failure realignment should not be done until after the faulty component has been replaced We recommend servicing be performed only by authorized Yaesu service technicians who are experienced with the circuitry and fully equipped for r
4. COLLEC EMITTER BASE 250458 03009 GROUND PC7805H 03003 M51943BSL 03004 omponent side reverse p 2506670 03008 BN1A4P 03014 Radioamateur cu for free Q1 BAND DATA ert ET ALC KEY at se 1a 5v h Po L7809 et EET 8 exo KOM 1J021 5 om M 1 13071 1310 19121 CAR 10 TONE TONE ITPS tuom 5 287101 me s me UT FERONT nooo OPTION px M iod ferien 5 zl E qo e z T 85 l HEN a 00000000000 Ra war RX ANT 9 ee Kor UE NB UNIT F2949101 eo o 81 _ MAIN UNIT 427 48200 CUT IN O 2942000 No 1xxx L 40 r ae al pJ 8 Ss gt id z PHONE JACK 3 5005 X O AND JO6 DISPLAY UNIT F2943102C No 3xxx CAPACITOR VALUES ARE IN pF SICAPACITORS ARE SEMICONDUCTOR CERAMIC P13 J041 FT 747GX CONNECTION DIAGRAM for free Radioamateur cu TRANSMIT A IT mr cm uro 25 7 2SKiS2AGR 25 104 250 588
5. CONTENTS TOP COVER EXPLODED VIEW ea ee eee eee eee eee eee eee MAIN UNIT asyl Circuit Diagram FILTER UNIT eee e s Circuit Diagram NB UNIT Circuit Diagram LOCAL UNIT TELETELE Parts Layout Circuit Diagram HOW PA UNIT 3 A e 00 SQ Parts Layout Circuit Diagram LPF UNIT EE EEE o ESS h Parts Layout Circuit Diagram DISPLAY UNIT aan Parts Layout Circuit Diagram CONNECTION DIAGRAM LEVEL DIAGRAM 9 Transmit Receive SIGNAL 4 5 woa siw w e o BSBUMODE CW MODE fm deve 544 FU A ER ERE SSE bee FM MODE MR duse av d S een ALIGNMENT ios me ropa L Local Unit II Main Unit Receiver III Main Unit Transmitter IV Noise Blanker Unit V 100W PA Unit Idling Current VI LPF Unit CM Coupler Balance VII Main Unit AFP Automatic Final Protection PARIS UST aurora rra rr FT 747GX TECHNICAL SUPPLEMENT This manual is intended to serve as a supplement to the FT 747GX Operating Manual De tailed information regarding functions installation interconnections and operation has been provided in the Operating Manual and is not reprinted herein Therefore this supplement is
6. 132 134 15 41 32 32 RX TX 01004 06 134 0 3 01005 1 7 0 78 88 17 40 34 34 RX TX 01006 22 74 24 34 01007 19 18 36 Q1008 Q1009 aoro 38 o sion ez 34 onora 53 07 0 0 1013 0 0 5001 0 43 onis 42 45 13 44 20 1017 0 0 0 0 av 01018 07 01019 RX TX 027 A 01029 0 01030 EIE 01031 075 01032 8 01033 01035 31 05 01037 0 0 05 74 40 0 8 72 145 188 ee 01043 0 5 0 50 06 RX TX 01044 0 6 0 0 0 6 01046 04 0 0 48 01047 8 7 1 5 01048 01 37 21 RX TX RX TX 382768 RX TX MAIN UNIT IC VOLTAGE CHART DC VOLT 2 ja s s 01014 84 25 84 25 88 25 90 90 31 27 01022 70 54 0 01034 52 o 0 90 01036 120 070 102 42 39 0 0 Q1038 01039 01040 0 0 48 48 0 0 0 0 01041 0 46 0 50 48 0 0 0 0 50 01042 0 0 0 48 01045 135 01 82 90 78 135 135 for free Radioamateur cu 50 50 REMARKS SQL VR CCW OW _ KEY UP DWN m a MODE AM 14MHz MODE AM 14MHz MODE USB RX TX MODE USB 14M _ CIRCUIT DIAGRAM
7. voltmeter Disconnect the voltmeter C PLL Subloop BPF the 6 Connect the RF voltmeter to the exposed lead of C2030 TP2002 Tune the transceiver to 7 0265 MHz LSB mode Adjust T2004 for peak on the volt meter at least 70 mVrms Move the voltmeter to TP2003 and retune the transceiver to 7 0267 MHz Adjust T2001 T2003 for peak on voltmeter more than 50 mVrms Disconnect the voltmeter D PLL Main Loop VCO 1 LOCAL UNIT ALIGNMENT POINTS Jio22 Jiois MAIN UNIT ALIGNMENT POINTS 23 Connect the DC voltmeter between the exposed lead of R2083 TP2004 and chassis ground Referring to the following table tune the transceiver to each ad justment frequency MHz adjust the corresponding transformer for 1 5 0 1 retune to the correspon ding check frequency and confirm the check voltage on the voltmeter Adjust Adjust Check Check Frequency Transformer Freq Voltage 2 5000 T2006 2 4999 45 6 5V 7 4999 50 65 0 1000 1 5 3 0V 7 5000 T2007 14 4999 50 65V 14 5000 T2008 21 4999 5 0 65V 21 5000 T2009 29 9999 50 65 3 Connect the RF voltmeter to pin 1 5 1 13 of 2024 and tune the transcei ver to 29 9999 MHz Confirm at least 90mVrms on the RF voltmeter Disconnect the voltmeters E Reference Oscillator Connect the frequency counter to the exposed lead of C2030 TP2002 Tune the transceiver to
8. 29420AE PCB with TE 400 4 T9317811 Wire ASSY PIS Components i T9317825 Wire ASSY w o NB UNIT 7 100 Version R3510940A Panel T 1C029420AF PCB with R3123790 Filter is Components R3123800 Knob MAIN w o NB UNIT R3123830 Knob pin 3 of JPaoo R6123840 Knob Q1001 G3801250 FET 28K125 i I EQL DRIVE 91002 01801250 EE R3123850A Knob CLAR Q1003 48007401 T 35 4 H R3123870A Knob D LOCK 91004 G3802410Y FET 28K241Y LPF UNIT ALIGNMENT POINTS f R3123890 Knob MODE 1005 G4800740L FET 3SKT4L i L R3123810 Knob VFO MR Q1006 G4800730L FET 3SK74L R3123930 Knob M Q1007 G4800740L FET 3SK74L R3123950 Knob M VFO 01008 G3304580B Transistor 28C458B 3 R3123960 Knob SPLIT Q1008 G3304580B Transistor 28C458B i R3123980 Knob PRIM Q1010 G3801040J FET 28 1047 R3123990 Knob FAST 91011 38019210 FET 2SKI92AGR R3124020A Knob POWER Q1012 G3107331P Transistor 25 831240308 Knob NAR Q1013 G3090074 Transistor BAIA4M R3124040A Knob ATT 91014 G1090633 IC M5218P R3124050A Knob NB MOX Q1015 G3304580B Transistor 28C458B R3124190 Ring 91016 G3304580B Transistor 28C458B R3804450A Case Top Q1017 G3090077 Transistor BAIL3Z R3804460A Case Bottom Q1018 G3304580B Transistor 28C458B L R5510950A Side Trim 91019 G3304580B Transistor 28C458B R0510960 Heatsink Cover Q1020 G30
9. 7 0000 MHz LSB mode If the TCXO option is installed adjust the trimmer accessible through the hole in the TCXO housing if necessary for 5 7635 MHz 3 Hz on the counter If the TCXO option is not installed adjust TC2004 if necessary for 5 7635 MHz 10 Hz on the counter Remove the counter F Carrier Point Disconnect plug P2001 from J1017 on the Main Unit and con nect the frequency counter to P2001 With the LSB mode selected adjust TC2003 for 8 2135 MHz 10 Hz on the counter Select USB mode and adjust TC2002 for 8 2165 MHz 10 Hz on the counter Select CW mode and set the DRIVE control fully counterclockwise minimum Press the MOX button to transmit and adjust TC2001 for 8 2158 MHz 10 Hz on the counter Press the MOX button again to return to receive remove the counter and reconnect P2001 to J1017 unless performing the next procedure G Carrier Level l Disconnect TMP plug P2001 from 1017 on the Main Unit and nect a 50 ohm resistor in parallel with the RF voltmeter to P2001 Confirm at lease 230 mVrms on the RF voltmeter in all modes Remove the voltmeter and resistor and reconnect P2001 to J1017 II Main Unit Receiver A RX IF Part I Connect the RF generator to the antenna jack and the AF voltmeter and an 8 ohm 3W resistor across the EXT SPKR jack Tune the transceiver to 14 2000 MHz USB mode Set the AF gain to the 10 o clock position Tun
10. 90074 Transistor BATAM R0510970A Heatsink Cover Q1021 G3304580B Transistor 28C458B R4804670A Heatsink 91022 G1090101 IC uPC1037H R0124060 Fitting Q1023 G4800740L FET 3SKT4L R3124010 Knob Q1024 G3802410Y FET 28K241Y R5510951 Side Trim Q1025 G3802410Y FET 2SK241Y 3124800 91026 G3305350B Transistor 28C535B R7049015 SP Net Q1027 G3801250 FET 28 125 R3100700 Foot 91028 G3304580B Transistor 28C458B R0100690A Stand 91029 G3090074 Transistor BAIA4M R7125160 Sponge 1 Q1030 G3090074 Transistor BAIA4M R7125170 Sponge Q1031 G3090078 Transistor DTA143ES R7125230 Press Board 9193 03320530 Transistor 28C2053 7125430 91033 G3090074 Transistor BAIA4M R7125450 Sponge Q1034 G1090633 TC M5218P 87125460 Sponge 01035 G3304584B Transistor 28 4588 2 Ke 1036 G1090749 1C M5223P R6125640A Washer 91037 03090074 Transistor 4 Name Plate Q1038 G1090721 1C M54563P round Lug 91039 G1090657 IC uPD4028BC heet 91040 01090836 IC M54564P 10W Type MAIN UNIT ALIGNMENT POINT a 100W AFP Section 29 for free Radioamateur cu ig PARTS LIST LIST
11. GATE I SOURCE 3SK74L 01003 1005 1007 1023 y SOURCE BARNS VZ GATE HJ 2SK104J 01010 y GATE IA 12 25 125 fe 1027 SOURCE DRAIN GATE 2SK192AGR 01011 2SK241GR E 004 1 x 1025 COLLECTOR EMITTER BAS 2SA733AP 01012 2504588 01008 1009 1015 1016 1018 1019 1021 1028 1047 1049 2SC458BTZ 01035 2505358 01026 2802053 01032 Solder side obverse COLLECTOR EMITTER EMITTER f 22 COLLECTOR COLLECTOR BASE J Component side obverse PIN 10 PINS PIN 18 PIN 16 PIN 9 PINS NOTCH NOTCH PINT PINT M54563P 01038 40288 01039 IR3MO3A 01045 1037 01022 ND48702 3R 01055 BAIA4M Spee M54564P 01040 uPD409480 01041 1042 M5218P 01014 1034 1033 1037 1046 M5223P 01036 BAIL3Z 01017 1048 for free by TE DTA143ES 01031 1043 Radioamateur cu 2SD669A 01044 DRAIN SOURCE 003 005 1007 023 21 001 1 23 027 DRAIN 01011 21004 1 1025 JOLLECTOR EMITTER 1012 008 1009 015 1016 018 1019 021 1028 047 1049 21035 326 732 gt COLLECTOR 244 n 3 yoco Component side reverse MAIN VOLTAGE CHART DC VOLT E S C D BiG REMARKS 01001 25 01 127 134 07 51 RX TX 01002 25 0 1 1127 134 07 81 gt RX Tx 01003 2 0 0
12. TOR EMITTER BASE 2010 2011 2015 2025 2S0535B E 2SC458C ET 2022 2028 2032 2SC732TMBL 02020 2027 2502053 02034 GATE DRAIN SOURCE ORAIN N SOURCE GATE 2SK192AGR 02017 PIN 18 NOTCH 54564 02002 Er NOTCH uPD4094BC 02001 PINE PIN 14 PIN NOTCH PIN 1 CX 7925B 02018 2024 uPD4013BC 02014 PING PING NOTCH PIN T SN16913P 02009 2012 M54459L 02013 PIN PC1037H 02021 PING CH 3 2012 213 021 PLL LPF UNIT CIRCUIT DIAGRAM me mom m or To i 187 HELET Component side reverse Solder side reverse COLLECTOR JASE emen 250262008 07023 Marked Surface for free Radioamateur cu COLLECTOR 2503240 05004 5005 BASE E HEAT SINK P A EMITTER EMITTER COLLECTOR 25B824R 05008 2502166 05001 GROUND N _ nur OUTPUT GROUND uPC7808H 05006 M5218L 05010 BASE NC HEAT SINK COLLECTOR COLLECTOR EMITTER 2SC31 33 05002 5003 COLLECTOR EMITTER BASE EMITTER t Bonus COLLECTOR 2508820 05007 2504580 05009 2502001 05011 for free by RadioAmateur eu PA UNIT VOLTAGE CHART DC VOLT B REMARKS 0 0 4 0 134 0 1 2 R
13. X TX 7 RX TX PA UNIT IC VOLTAGE CHART VOLT 7 8 REMARKS 05006 04 134 RX TX 135 135 FAN OFF ON 102 y 1P40041 704 our CIRCUIT DIAGRAM 2 a i kenn Ria Component side reverse for free by RadioAmateur eu RESISTOR VALUES ARE IN 1 84 CAPACITOR VALUES ARE IN SOwv IMOUCTOR VALUES ARE IN Hi UNLESS OTHERWISE NOTED CIRCUIT DIAGRAM PARTS LAYOUT 9201896283 Component si reverse Solder side obverse Component side obverse DISPLAY UNIT VOLTAGE CHART CIRCUIT DIAGRAM DC VOLT 5 gt 65 a lt I o eo lt E zi gt gt lt d o Y Q 80 M50932 501 FP 03001 P dd R g H Tx 220 DISPLAY UNIT F2943102A No 3xxx FTD8627PZ e LJ ses Q o Q Q e 9 TDA2003H 03002 GROUND INPUT OUTPUT OUTPUT GND COLLECTOR INPUT fre BA1A4M 03005 3006 BA1A4P 03007
14. e the RF generator for a 1 5 kHz heterodyne in the receiver and adjust the injection level for S 7 on the S meter Adjust T1003 T1013 for peak on the AF voltmeter reducing the injection level if necessary to keep S meter deflection near S 7 Leave the test equipment connected for the next three procedures B S meter Sensitivity Part I 1 2 24 Connect the RF voltmeter to the emitter of Q1008 Tune the transceiver to 14 0000 MHz USB mode and adjust VR1004 for minimum on the voltmeter Adjust VR1002 so that the S meter just begins to deflect Disconnect the voltmeter and continue with the next procedure for free by Radioamateur cu RX IF Part II 1 Set the transceiver to 14 2000 MHz USB 2 Tune the RF generator for a 1 5 kHz heterodyne in the receiver and adjust the injection level for S 7 on the S meter 3 Adjust T1003 T1013 for maximum on the S meter reducing the injection level if necessary to keep S meter deflection near 5 7 4 Reduce the injection 6dBu and adjust VR1001 indication 5 Perform the next procedure level to for 5 1 D S Meter Sensitivity Part II Perform the preceeding procedure if not done already Set the RF injection level to 100 dBu and adjust 1003 for S meter deflection of 60 dB over S 9 Disconnect the test equipment E RX Ist Mixer ls In LSB mode tune to the internal heterodyne near 7 1 MHz 2 Adjust VR1004 for best n
15. e transceiver tuned to C5 K19149025 Ceramic CAP 50 0 10 7475 VE control fu 1 R8124090 Nameplate and set the DRI 14 2000 MHz CW mode set the LI L9190010 Ferrite Beads a clockwise DRIVE control fully clockwise L2 L9190047 Ferrite Beads R0TZ40802 Motor Holder 3 Press the MOX button and adjus 3 Press the MOX button and adjust SPI peaker I 5W 8 ohm M2190004 Motor MONTRI 13 59 tion d 19205619 AS TC4001 for minimum deflec VRIOII for 75W output JI Connector TANT zn i 12 P0090158 Connector MIC ys again to 4 Press the MOX Burton again to 33 P0050026 Connector 4 Press the MOX button ag s return to receive and disconnect 13 8V DC ymbol part No Description Did return to receive and remove the the test equipment 99000018 Terminal 1 F2942000A Printed Circuit ipment Q 1 arcon Board test equip y 0900012 nsulator 1 C029420AA PCB with Components 5 ire ASSY P1 P2 10W Version F T9205618 Wire ASSY P3 P4 20420 PCB with 79315504 Wire ASSY P5 P6 Components t 619 Wire ASSY a 7 1009 Version F 3 ow T9205620 Wire ASSY P8 029420 PCB with E T ire Components 77021277 79205622 Wire ASSY 10 GOED PCB with M 623A Wire ASSY Ti Components 1 T9205624A Wire ASSY NB UNIT i 79205625 Wire ASSY 10W Version F 2 793113018 Wire ASSY Pi C0
16. epair and alignment Therefore if a fault is suspected contact the dealer from whom the transceiver was purchased for instructions regarding repair Authorized Yaesu service technicians realign all circuits and make complete performance checks to ensure compliance with factory specifica tions after replacing any faulty components Those who do undertake any alignment are cautioned to proceed at their own risk Problems caused by unauthorized attempts at realignment are not covered by the warranty policy Also Yaesu must reserve the right to change circuits and alignment Procedures in the interest of improved performance without notifying owners Under no circumstances should alignment be attempted unless the normal function and operation of the transceiver are clearly understood the cause of the malfunction has been clearly pinpointed and any faulty components replaced and the need for realignment determined to be absolutely necessary The following test equipment and thorough familiarity with its correct use is necessary for complete realignment Correction of problems caused by misalignment resulting from use of improper test equipment is not covered under the warranty policy While most steps do not require all equipment listed interactions of some adjustments may require complex adjustments be performed afterwards Do not attempt to perform only a single step unless it is clearly isolated electrically from all other ste
17. not intended to serve as an independent reference but to be used in conjunction with the information provided in the Operating Manual Because there are nearly two hundred and fifty semiconductor devices in the FT 747GX circuit description information is provided in the form of numerous block diagrams We hope that this manner of providing functional information proves to be more convenient for the owner and technician than would a lengthy verbal description Those readers unfamiliar with the basic types of analog and digital circuits that serve as the building blocks of the FT 747GX are encouraged to study instructional material such as that provided in handbooks on amateur radio and digital circuit design before attempting to understand the design of the FT 747GX Each block in the block diagrams represents one such basic circuit General infor mation on integrated circuits and their applications is available in the data provided by the IC manufacturers Specific circuit details are provided in the schematic diagrams in this manual While we believe the technical information in this manual is correct Yaesu assumes no liability for damage that may occur as a result of typographical or other errors that may be present Your cooperation in pointing out any inconsistencies in the technical information would be appreciated Yaesu Musen reserves the right to make changes in the circuitry of this transceiver in the interest of technological impro
18. nt between 20 and 30 68 to 86 F When the trans ceiver is brought into the shop from hot or cold air it should be allowed some time for thermal equalization before alignment temperature be Alignments must only be made with oscillator shields and circuit boards firmly affixed in place Also the test equipment must be thoroughly warmed up before beginning Alignment values assume a DC supply voltage of 13 5V DC Note Signal levels in dB referred to in the procedure are based on alignment OdBu 0 5uV FILTER UNIT MAIN UNIT LPF UNIT N B UNIT LOCAL UNIT MIX BPF UNIT DISPLAY UNIT for free Radioamateur cu 1 Local Unit A 2nd Local Overall Check T2002 T 2005 s TP 2001 3 of Q2024 o TP2002 T2004 TC200 TC2002 TC2003 T2001 1 Disconnect TMP plug P2002 from 11022 on the Main Unit Connect the frequency counter to P2002 and confirm 38 8380 MHz 400 Hz on the counter Remove the counter and connect a 50 ohm resistor and the RF volt meter to P2002 Confirm at least the voltmeter Disconnect the resistor and volt meter and replace P2002 in 1022 230 mVrms on PLL Subloop VCO l Connect the DC voltmeter between the exposed lead of R2058 TP2001 and chassis ground Tune the transceiver MHz LSB mode Adjust T2005 for 2 0 0 1V on the meter Retune the transceiver MHz and confirm at to 7 0015 to 7 0014 least 5 6 0 6V on the
19. ps Rather have all test equipment ready before begin ning and follow all of the steps in a section in the order they are presented A 50 ohm dummy load must be connected to the antenna jack in steps calling for trans mission pressing the MOX button Correct alignment is not possible with an antenna The NAR ATT and NB buttons should be set to OFF and the SQL control must be fully counterclockwise unless stated other wise After completing one step read the follow ing step to determine whether the same test equipment will be required If not remove the test equipment except dummy load and wattmeter if connected before proceeding 21 Alignment Equipment Frequency counter with accuracy of 0 1 ppm to 100 MHz DC voltmeter with at least 10 input impedance RF voltmeter with at least 5 accuracy to 100 MHz high impedance and ranging from 10 mV to 3 Vrms AF millivoltmeter DC milliammeter ranging to 500 mA RF in line wattmeter Resistive dummy load 50 ohms 150W three re quired for SWR Turndown alignment RF signal generator covering 1 30 MHz with calibrated output levels from 5 dBu to 100 4 AF signal generator with calibrated output levels from 1 mV to 25 mV RF sampling coupler T Additional Alignment Precautions Correct alignment requires that the ambient the same as that of the transceiver and test equipment and that this temperature be held consta
20. ss the MOX button and adjust VR1007 for minimum on the volt meter Press the MOX button again to return to receive and disconnect the voltmeter D AM Carrier Level 1 With the dummy load and watt meter connected to the antenna jack and tuned to 14 2000 MHz AM mode set the MIC gain fully counterclockwise 2 Preset VR1006 fully clockwise 3 Press the MOX button and set the DRIVE control for 80W output 4 Adjust VR1006 for 20W output 5 Press the MOX button again to return to receive and remove the test equipment MAIN UNIT ALIGNMENT POINTS Transmitter Section 26 i for free by Radioamateur cu IV Noise Blanker Unit Connect the RF generator to the antenna jack and the DC voltmeter between TP8001 and chassis ground Tune the transceiver and RF gen erator to 14 2000 MHz and inject 40 dBu with no modulation Press the NB switch and select the USB mode Adjust T8001 and T8002 for mini mum deflection on the voltmeter Disconnect the test equipment Jumper VRsoo NB UNIT ALIGNMENT POINTS V 100W PA Unit Idling Current Temporarily remove the jumper indicated below and connect the DC milliammeter set to 500 mA range in its place Set the transceiver to USB mode and set the MIC gain fully coun terclockwise Press the MOX button and adjust VR5001 for 200 50 mA on the milliammeter Press the MOX button again to return to receive remove
21. the milliammeter and reinstall the jumper 100W PA UNIT ALIGNMENT POINTS 27 ALIGNMENT PARTS LIST i i R7125850 Press Board in Unit AFP Automatic Final A re VI LPF Unit CM Coupler Balance VII Main Wo Part No Description Device LUIS Sponge Protection QI GI090778 1 17809 R0126000 Clamp load to the 92 G1090294 IC uPC7808H R7125631 Spon Rubber dumm oa x 83126040 ubber Foot i ES Itmeter 1 Connect the wattmeter and 16 7 VRI 46280097 Potentiometer 10 10 AF SQL R7126140 Mu antenna jack and the DC voltme hm dummy load three 50 ohm VR2 76280098 Potentiometer 10kB710kB MIC DRIVE EL Plate o R6100980A Nut between pin 3 of JP4001 and chas ds in parallel to the antenna Ci K19149025 Ceramic CAP 80WV U IuF R7126400 Plate T d loads in p C2 K13179009 Ceramic CAP F SOWV 0 047uF R7126410 Fiber sis ground jack K10176102 Ceramic CAP B 2 R7126640 Sheet de C4 K13179008 Ceramic CAP F 50 0 010 R8124070 Nameplate 2 Tune to 14 2000 MHz 22 2 With th
22. ull of the heterodyne F Noise Squelch l Tune to 14 2000 MHz USB mode and set the SQL control to the 10 o clock position Adjust VR1005 so the squelch just closes when no signal is received T vods T oos Tipos T 1006 Tios Tas VR2003 oo VR2002 Qiove VR 004 Trova VRzcos Tine Tion MAIN UNIT ALIGNMENT POINTS Receiver Section 25 III Main Unit Transmitter A TX IF Ls Connect the dummy load and watt meter to the antenna jack and tune to 14 2000 MHz CW mode Press the MOX button and set the DRIVE control for 50W output Adjust T1014 T1019 for peak on the wattmeter reducing the DRIVE if necessary to keep power below 60W output Press the MOX button again to return to receive ALC amp PO Meter Sensitivity 1 With the dummy load and watt meter connected to the antenna jack and tuned to 14 2000 MHz CW mode set the DRIVE control fully clockwise 2 Press the MOX button and adjust VR1010 for 100W output and then VR1012 for S meter deflection to 8 on the PO scale repeating both adjustments alternately several times Trois Troe Tioiz Trois Jiooz VR VR 1007 VR1012 C SSB Carrier Balance ls With the dummy load and watt meter connected to the antenna jack and tuned to 14 2000 MHz CW mode set the MIC gain fully counterclockwise Connect the RF voltmeter to J1002 Pre
23. vement without obligation to notify owners or to modify any sets produced prior to the modification ach side to away from both hands Figure 2 1 which a clip at rizontally latch the aiding the sition and ut 2 cen lips clear R0510960 R3056970B P1090194 09000192 C029480AA 7 R0124080A GS M2190004 R3510951 Part na Deseriprion p U 00406001 P H S M4x6 u 02205001 S S 5 25 5 003306001 S S ASM 3x6 T enn S S HSM 3x108 R4804670 A 5 020305002 B H S M3x5NI U23308001 T S M3x8 V 30306001 F H S M3x6 C029470AA c Z R0125890 4 7 i 14080030 Sfo124100A 80124084 87125630 N P0090158 C029420AX P1090351 I SS 86000092 N R7126160 M0290057 TS N R3510940 A N SR A 7 ES R81 24090 ATT R3124040A Filter 3124800 NB 31240504 MOX 3124050 R3124020A J6280098 3 J6280097 84099 RO126000 R3123800 R3123850A R 712 D LOCK A3123870A R7 NAR 31240308 4 MODE p R3123890 2 R3100700 VFORM R3123930 R0100690A M b R3123950 I C029431 AX VFO MR R3 o DE SPLIT R3123960 4 2 312 IM pw R3126040 FAST R 3123990 R3124190 R3123830 BAND R3124010 for free by Radioamateur eu ORAIN PARTS LAYOUT __ _ sner
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