ft 757 gx manual portugues

Control\nsignals are passed to the transceiver on a serial data\nline, accessible at the EXT CNTL jack on the rear\nof the transceiver. Software\nis provided with some of the Yaesu Interface\nUnits when they are designed for use with one\nspecific microcomputer. The Frequency Step Com-\nmand example shows how dummy data (\u201cQp\u201d) is\nrequired in all other commands, preceding the\ninstruction byte.\n\nOnce the 5-byte command has been sent to the\ntransceiver, it will respond with the appropriate\nchange indicated on the front panel display. If\nnot, an error has occurred either in the data sent\nor in the interface connection, so these should\n\nPROGRAMMING\n\nSTART\n\n \n\n \n\nbe inspected before the command is sent to the\ntransceiver again. Note that the controls on the\ntransceiver are not disabled when exercising\nexternal control; touching any control on the\ntransceiver that duplicates an externally-controlled\nfunction will invalidate function indications on the\ncomputer dispiay. The external control program\nmay then have to be reinitialized to clear inva-\nlidated variables. To avoid problems caused by\ninadvertent movement of the tuning knob, the\nD. PEL Subloop (PLL-1) VCC\n1. Connect the hi-Z DC voltmeter to TP,oo3 and\n\n2. Check for proper VCC control by tuning\n\nbetween the adjustment and check frequencies\nin each of the above four ranges, using the\ntuning knob or microphone scanning buttons,\nand watching the DC voltmeter for smooth\nvoltage change. If the voltage changes un-\nevenly, or jumps, \u00e0 fault is indicated.\n\nQ. 2nd Local Level\n\nConnect the RF voltmeter to J,909. Check that the audio frequency\nis below 350 Hz.\n\nNow increase the frequency of the AF\ngenerator so that the power output rises to\nfull power and then down to 25 watts again\nabove 2 kHz, Check that the audio frequency\nis now above 2900 Hz.\n\n \n\f \n\n4. Return to receive, switch to LSB, and repeat\nthe above checks in this mode.

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Talvez voce possa carregar uma foto para os Yaesu FT-757GX ? By submitting a comment, you are declaring that you agree with these rules: Although the administrator will attempt to moderate comments, it is impossible for every comment to have been moderated at any given time. You acknowledge that all comments express the views and opinions of the original author and not those of the administrator. You agree not to post any material which is knowingly false, obscene, hateful, threatening, harassing or invasive of a person's privacy. The administrator has the right to edit, move or remove any comment for any reason and without notice. Failure to comply with these rules may result in being banned from further commenting. Before\nmaking any modification, make sure that it applies\nto the Lot number of the particular transceiver\nbeing modified.\n\nAlso, before making any modification, check to see\nif it has already been carried out by a Yaesu agent,\ndealer or previous owner.\n\nQSK Keying Stability\n\nThe following modification may be made to\nimprove the stability of QSK operation, if it is\nfound to be unstable. Do not\ndisturb any other connections on this Unit.\n\nNow referring to the RF Unit diagram on the\nfollowing page, solder a 5 cm extension wire to\nthe end of the blue wire removed from the\n100W PA Unit, and then carefully insulate the\nsplice with vinyl tape. The cause of\nthis problem is insufficient isolation within FM\ndetection subsystem IC Q,022 (MC3359) on the RF\nUnit during CW operation. To remedy this\nproblem the following modification will remove\nthe supply voltage from FM 2nd IF signal buffer\nQi.This\nmodification has already been carried out in all sets\nfrom the beginning of Lot 6 onwards, as well as in\nsome of the later sets in Lot 5,\n\n1. The cathode lead of this diode is the\nupper (exposed) lead.\n\nRepiace the bottom cover and reconnect the\npower supply.

iiiiiiciiiiiiii 3SEMICONDUCTOR LOCATIONS.liciii rr 2I00W PA UNIT.i serra 44FP-757GX PARTS LIST. iii. FP.757HD PARTS LIST.,.e iii ren 66. For Servica Manuais ContactOxon Ox9 40Y. Tol- 01844-351604 Fax: 01844-850654. Email- enquiriesmayritton,c0.ukAmateur Radio DirectoryOxon 0X9 40Y. Tel-01844-351894 Fax: 01844-352554. Email: enquiriesQmauritron.co.ukOperating Manual, and is not reprinted herein. Therefore, this Technical Supplement is not intended toOperating Manual. Because there are nearly four hundred and fifty semiconductor devices in the FT-757GX, circuit descrip-Those readers who areFT-757GX are encouraged to study instructional material, such as that contained in handbooks on amateurEach block inSpecific circuit details are provided in the schematic diagrams. The few modifications that have been developed for the FT-757GX since the start of production are allAll of these modifications have been incorporated from Production Lot 5 onwards,While we believe this technical information is correct and factual, Yaesu assumes no liability for damageYour cooperation in pointing outYaesu Musen reserves the right to make changes in the circuitry of this transceiver, in the interest ofFirst Printing Only: KEY plug requirements. The KEY jack on the rear panel of the FT-757GXConnections. The two lower interconnection diagrams on pageQSK amplifier from premature excitation when theThe information stating otherwise on pages 13Plug drawing), and 28 (middle of second paragraphSchematic Diagram Correction: R269 on the RFRF UNIT show the value of R269 (bottom center,AC and DC potential. Voltage at the tip canIf you do lift a trace, don't worry! Read onIn storage, use only conductive sponge speciallyWhen installing a CMOS part in a socket, or on aWhen soldering a CMOS part onto a circuit board,For Service Manuais ContactOxon OX9 40Y. Tel: 01844-351694 Fax: 01844-352554. Email enquiries(Omauiron coaContinue to apply heatjustDo not apply more heatA smooth fillet of solderOxon OX9 4QY.

Connect the frequency counter through a\n0.01 uF capacitor to pin 1 of Qrozz. Apply a 60 dB signal at 14,000 MHz from\nthe RF signal generator to the antenna jack, and\nadjust Tio through Toro and Tiooy through\nTiooa, in that order, for maximum S-meter deflec-\ntion. Reduce the signal generator level as necessary\nto keep the meter below full scale.\n\nE. Width Oscillator (Fine)\n\nWith the WIDTH and SHIFT controls both set to\nthe 12 o'clock position, switch the mode back and\nforth between LSB and USB, adjusting Lioa4 for\nthe same noise pitch.\n\nF. IF Gain and S-Meter Sensitivity\n1. Squelch Threshold\n\nBeginning with the transceiver in the AM mode,\nwith no signal applied at the antenna jack, advance\nthe SQL controi gradually from the fully counter-\nclockwise position just to the point where the\nsquelch closes. Then switch to the FM mode, and\nadjust VRioo3 to the point where the squelch\nagain just closes.\n\nJ. FM RX AF Output Level\n\n1. With the AF voltmeter connected across the\nspeaker terminals, apply a 40 dB signal at\n14.000 MHz (with no modulation) from the\nRF generator to the antenna jack. Return the METER\nswitch to ALC when the PO indication is maxi-\nmum. PO Meter\n\nAt 14 MHz, CW mode, press the MOX button and\nadjust the DRIVE control for 100 watts output on\nthe external wattmeter. Set the transceiver to\nthe CW mode, and transmit a 14 MHz carrier into\nthe dummy load. Adjust TC300, for minimum\ndeflection on the meter.\n\nJs001 TC 3001 Jaoou\n\n \n\nLPF Unit\n\nQuoos Qsoos Quooa Jscos Jsoaz Juoor\n\n \n\nPA Unit: Idling Current\n\nRemove the jumper shown in the following figure,\nand connect the DC millizmmeter (500 mA range)\nin place of the jumper. Replace\nthe jumper after the adjustment.FT- 757 mu Ina. For Service Manuals ContactOxon 0x9 40Y. Tel 01844-351694 Fax: D1844-952554Amateur Radio DirectoryERRATA FOR THE FT-757GX OPERATING MANUAL.cccciiciciiiiiiis 2. SOLDERING AND DESOLDERING TECHNIQUE.

O, OssSojderAmateur Radio DirectoryIn some sets prior to Lot 6, IF signal leakage hasCW-N reception with the FT-757GX. The cause ofUnit during CW operation. To remedy thisQi. except during FM operation. ThisReferring to the drawing below, cut jumperVRion- Splice a 3 to 5 cm length of hookupTOS Hyobouo Ei du sy. Eh. El Le LaVRioo3). The cathode lead of this diode is theRepiace the bottom cover and reconnect theCIISI O.OtuF. Rio ixnRISS giga 8rQue. ESA eFo EA R6z om BIO Gs To 4 50 mm. Ros 23 gas EN U SPIQIT DO O S. PP SE -shUlos dis E. ER Bio ARS a 416 PiBTIComponent sideUnits when they are designed for use with oneThe EXT CNTL jackSerial Input: accepts standard TTL-level data. Automatic Gain Control: analog signal output rangingFormatInstructionShown below are examples of two basic types ofFrequency Enter CommandFor Service Manuals ContactOxon OXa 4QY. Tel: 0184435169 Fax 01844-350654. Email enquistes Omarion co uk. Frequency Step CommandFrequency. Parameter !The Frequency Step Com-Once the 5-byte command has been sent to theD. LOCK command can be programmed to beOxon 0x9 40Y. Tol- OIBA4-aStena Fax 01844-052554. Ermaik enquiriesOmauritronco.uk. NoA Exchange operation beturgon VFOs AExample: 12.345,67 MHzData output routines in the external computerRemove the 5 screws in the board and the KEYB. SSB, AM, CW RX LO Level. Connect the RF voltmeter to pin 2 of Q,o12 andC. 45 MHz Bandpass Filter. With the transceiver set to the 14 MHz band,D. 60 MHz Bandpass Filter. Set the transceiver to the 21 MHz band, and withE. 45 MHz Tripler. Return the transceiver to the 14 MHz band, andAdjust TooosF. 15 MHz Reference Frequency. G. 2nd Local Oscillator FrequencyH. Carrier Point. Connect the frequency counter to Jogos andI BFO Frequency. Set the transceiver to a CW mode, and connect theHz) on the counter.K. Carrier Level. Set the transceiver to the LSB mode, and connectClose the PTT line. L. Carrier Balance. With the transceiver set to LSB, connect the RFM.

Tel 01844-351894 Fax:- 01 844-850554Terminat. Emei enquiies(mauritonco uk. Wire Bridge. Square Cut yAfter Soldering Wire BridgeExcessive drive Internal noise. High temperature Instability. MOS FET Static electricity Total failure. MOS IC Short or open circuit. Crystal Shock No oscillation. Crystal filter High temperature Off frequency. Aging Frequency drift. Filter bandpass change. Resistor Excessive power Component bumed. High temperature Value changed. Open circuit. Potentiometer Excessive power Component burned. Shock Open circuit. Dust or oil Noise. Wear Unsmooth rotation. Capacitor Excess voltage Shorted. High temperature Leakage. Variable capacitor Ratings exceeded Shorted. Trimmer capacitor Dust between plates Leakage. Shock, forced rotation Unsmooth rotation. Coils Ratings exceeded Open or short circuit. Misadjusted Leakage or shorted tums. Core or bobbin broken Detuned. Switch Ratings exceeded Poor contact. Aging Unsmooth operation. Dust or oil Open circuit. Relay Ratings exceeded Coil open. Humidity Poor or intermittent contact. Dust or oilon contacts Noise. For Service Manuals ContactOxon OX9 40Y. Tol- 01844-351694 Fax 01844-52554The first two digits (closestSo, for example, serial number 0C123456 is from. Production Lot 12, set number 3456. BeforeAlso, before making any modification, check to seeQSK Keying Stability. The following modification may be made toThis modification hasThe diagrams below and on the following pagesUnit and RF Unit during the following steps:Referring to page 11, disconnect the trans-Referring to the 100W PA Unit diagram on theNow referring to the RF Unit diagram on theSolder the other end ofRoute the blue wire carefully so that it will notThis completes the modification.Oxon 0X9 ay. Tek OIB4M-S51694 Fax 01844-352554. Email rquiries O mauritron.co ukDigoTo RE UNITOxon 0X9 40Y. Tek-OiB4s-351694 Fax 01844-852554. Email: enquiriesOmauritron,oo akSolier A Topo. NETO From LOCAL UNIT.

You can also click here to see all the manufactories that mods.dk have manuals, schematics or other files from. During the first day I noted 3 serious faults, which were eventually resolved. After this you can test how the receiver and transmitter works. In spite they shown no obvious contact problems, the frequency at times began to drift and wobble suddenly for no reason. Listen also for worn bearing noise from the PA blower - try to lubricate or replace the motor if noisy or if the fan doesn't do the short spin burst at all when the rig is switched on. If you need to open the PA's inside cover, check the antenna connector's center pin's jumper's soldering joints are OK, not cracked or loose. Cracked and bad-looking solder joints needs to be resoldered carefully - pay special attention to connectors and do not make solder bridges. During troubleshooting and generally working on the receiver, to limit damages, I recommend you use a current-limited DC power supply set to about 1 A limiting, just in case an accidental short-circuit occurs. You don't find the advice elsewhere on the web to fix these not-so-uncommon faults in FT-757GX!: Everything else, but the FM receiver, worked - it was silent. Listening carefully at full volume I heard something - the squelch potentiometer worked OK - the problem was not actually a squelch problem, but the FM audio was just extremely weak. The glassfiber tape Yaesu had used for isolating the modification's components, had become very brittle which may have caused a short, or it maybe was just a bad diode (1N4148-type). Anyway, all the original insulation work done with the brittle turned tape needs to be re-done better with something, that is more durable over time. There are a few other places you need to do the same, like the cage over the LOCAL UNIT, which may short the PA fan wire terminals.

When reassembling the PCB, make sure you have inserted all unpplugged cables back on their sockets and none are left under the PCB to cause short-circuit. If it is almost deaf, check first the light bulb (F01) by shorting it out. Real nasty to troubleshoot - the receiver was not supposed to have suffered such damage typical for contester's radios. Only trick to find out was to tune to 28 MHz and note the sensitivity, or S-meter reading of a carrier (from sig. I reconnected D19 and just for curiosity cut all the BPF's antenna-side Shottky diode's legs one-by-one and found all more or less RF leaky. If the 28 MHz BPF also has damaged diodes (MA190), the method might not work as assumed. Diodes are cheap and it's better replace many enough, so you get no second thoughts later. I used BA244 and some 1N4148 if no switching diodes are at hand. The damage was most likely a result of static surge from the antenna, but too much RF-power into the receiver from another transmitter (any band) can also cause such damage to any modern HF tranceiver. In fact this fault actually also reduced the transmitter's drive, since TX drive power is piped via the same BPF- bank and diodes - the Drive- knob had to be turned fully clockwise for 100 W output, but after repair about half-way setting was enough. Last, calibrate the frequencies; the 15 MHz reference, then LSB carrier (TC05), CW carrier (TC04), USB carrier (VR05) and FM carries (VR04). See service manual downloadable from the Internet for a full description of the procedure. The radio needs to be warmed-up, since it (the 15 MHz reference XO) seems to drift about 200 Hz during the first hour (no TCXO). I did not get the carrier XO frequencies just spot-on, but they are within given tolerances. The fault was eventually found to be the transistor Q(60)08 a 2SA1012Y. It was not showing the correct voltages as per the voltage chart - changed it for a TIP42C.

AM Carrier LevelRoomTzo21,T2009Adjustment Locations. For Service Manuals ContactOxon OX9 40Y. Tel-01844-351694 Fax O1B44-350554. Email enquiiesOmauritron co ukO. 41 and 56 MHz Bandpass FiltersConnect the RF voltmeter to TP,oos andMain PLL (PLL-2) VCCQ. 2nd Local Level. Connect the RF voltmeter to J,909. Adjust T,o0sSs.Connect the frequency counter to J,909, andWhile receiving, check the total adjustmentIf not, adjust Loo11Frequency), and then this check again. VOX Gain Preset. Preset VR5011 fully clockwise, and set the. VOX GAIN control on the rear panel fullyNow rotate the VOX GAIN control fullySSB Carrier Point Check. With the AF generator connected as in theClose the PTT lineFor the 10-watt model FT-757SX, divide allReduce the frequency of the audio generatorNow increase the frequency of the AFIf 25 wattsCarrier Point (H) and then the IF Shift Zero. Point (R) procedures. U. FM ModulationWattmeterTransceiverOxon OX9 40Y. Tot 01844-351094 Fax: 01844-352554. Emait- erquiesOmauritron.co.ukA. 3rd Local Buffer. Connect the RF voltmeter to the emitter of Q,oasB. 2nd Local Buffer. Connect the RF voltmeter to the jumper between. Tioos and T;o23 On the component side of theC. Width Oscillator (Coarse)WIDTH control to the 12 o'clock position,Qro and adjust Tjoyo for maximum RFD. RX IF Transformers. Preset VRi99; fully clockwise and adjust VRioioTiooa, in that order, for maximum S-meter deflec-E. Width Oscillator (Fine). With the WIDTH and SHIFT controls both set toF. IF Gain and S-Meter SensitivityRF signal generator to the antenna jack, andG. Noise Blanker. Connect the DC voltmeter to gate two of Quais,Mkiz. With the NB button depressed, adjust TjoosH. FM 3rd Local. With the RF signal generator connected to theAF voltage on the meter. I. Squelch Threshold. Beginning with the transceiver in the AM mode,J. FM RX AF Output LevelRF generator to the antenna jack. Set theFor Service Manuais ContactOxon OX9 40Y. Tel: 01844-351694 Fax: Q1844-g52554. Email: enquiries O mauntron.oo.

ukTioosTioos; Ra voo. Tio2 o Elia. Enio VR. VRioosChassis Bottom View: RF Unit. RX Adjustment Locations. For Servics Manuais ContactOxon OX9 40Y. Tef: OIS4A- 351694 Fax DIBAA 352554. Eai enquiies(Brmaurtron co ukA. ALC Meter Zero Set. With the transceiver tuned to 14 MHz, USB mode,ALC just starts to produce meter deflectionB. TXIF Transformers. At 14 MHz, CW mode, with the METER switch setPress the MOX switch and adjust T;o20, Tioz, and. Tjo2s through T;c25 for maximum deflection onReturn the METERAt 14 MHz, CW mode, set the DRIVE controlFor Service Manuals ContactOxon OX9 4QY. Email enquiriasOmauriron co ukAt 14 MHz, CW mode, press the MOX button andREV switch to FWD, and with the front panel. METER switch set to PO, adjust the FWD SETE. SWR Tumdown (Automatic Final Protection). At 14 MHz, CW mode, connect a 16.6-0hm dummyRotate the DRIVEF. CW Sidetone Level. With the AF voltmeter connected across theToaua. Tuza. VR vou. Toaus. VRivos. VRious. VRions. VRisos VRioos (CW Sidetone Level). Chassis Bottom View: RE Unit. TX Adjustment LocationsSet the METER switch to PO and the rear panei. FWD-REV switch to REV. Set the transceiver toJs001 TC 3001 JaoouQuoos Qsoos Quooa Jscos Jsoaz JuoorRemove the jumper shown in the following figure,With the transceiver set toFor Service Manuais ContactOxan OX9 40Y. Tel O1844-351694 Fax: DIB44-352554. Emai- enquiriesOmauritron. co. ukOxan OX9 40r. Tel 01844-351694 Fax D1844-352554. Email enquiiesGOmauritron co ukQoos-Ab roerLOCAL UnitFor Servico Manuals ContactOxon OX9 40Y. Tel 01B44-351694 Fax- D1844-352554. Emeait: enquiriosOmauitron.co.uk. In this page you find schematic, users and instructions manuals, service manuals, technical supplement, leaf leads and other good stuff. If you have some stuff that not is listed here you can donate this by contact mods.dk. And when you click on the file or icon it will count as a download. If you want to see manuals from other manufactories you can click on the manufactory menu in the left side.

On PA board 10 uF 25 V tantalum caps C24, C27 and C32 were destroyed and showed some signs of burning. Lower TX power on 28-30 MHz: 100 W on all bands 1.8-24 MHz but on 10 m about 60 W. Adjust VR(10)05 for power output on 10 m, VR(10)06 is output power for all other bands. When everything works, tape, wrap and place all wirings carefully, specially the ones between PA and LOCAL unit, so they will not get pinched when you reassemble the PA and bottom cover. Negligence in this issue will cause damage to components when radio is powered and some wire(s) get shorted to ground (may happen even weeks later). I don't have the datasheet for the TMS2370, but it seems to be a simple 13 chars, 7 segments VFD display driver. You can deduce this from the FT-757GX Tech manual. In short: If the TMS2370 is faulty but the VFD is ok, it can be modified to drive the original VFD. If the TMS2370 is faulty and the VFD is faulty as well, it can be modified to drive a LCD If the TMS2370 is ok but the VFD is faulty, then you have to replace both, so it is the same as above. With the spare pins you can even keep some of the USB CAT functionality, unthinkable for such an oldie. If there is real interest in this, I can do it, please email me. Testing the VFD The most usual problem of a VFD seems to be the loss of vaccuum. You can esily check that because the getter material (silvery metal deposition on some parts of the glass) turns white when in contact with air. Also, something youn can test, are the voltages. According to a HAM I know, the voltage on the filament should be arround 2 volts. And there is a resistance of 10 ohms in series with the filaments (R01 at pin 30 of VFD in my circuit), that might be open. You should desolder that resistance, check it with a multimeter, and also test for continuity both the filament and transformer, and possibly replace the resistance with a new one.

According to this friend, it is as well possible to replace the VFD with one from an old calculator, of similar characteristics. I guess it is easier to say than to actually get one. If you do this, you will loose the fancy characters (VFO A-B, CLAR, LOCK, etc), which will be represented by segments of the first 2 digits. I guess you can figure that out easily and get used to it anyway. Here you have a link which gives a nice explanation on VFDs: IMPORTANT NOTE: It is well known that there is a transistor, Q01 (or Q4001) 2SC496Y in the display unit, which is a NPN Silicon and its application is as oscillator for the DC to DC converter. This is used to obtain -8V for the whole radio, and -13V (or was it -16. I don't remember now) for the VFD display. If that transistor is faulty, then your display certainly does not work, and your radio might or might not work. Before even thinking of replacing the chip, test this transistor, and verify you have the correct negative voltages. Refer o the Tech manual. (It can be replaced with the very common BD135) More info in this page Second important thing. If the transistor is fine, the next step is to try to verify if the problem is the chip or the VFD, or both. This can be easily done with an oscilloscope. If you don't have an oscilloscope then you'll need a tester with Freq meter. If you don't have that.TMS2370 Replacement I have good news. An OM from Germany, DB6RK Rudolf Kauls, has done a small board with a PIC and SMT transistors to fit as a replacement for the impossible to find TMS2370. I have some photos of it, and if you need one, you may contact him directly to (To avoid SPAM, you'll have to manually copy the address). If you need help If you plan to email me about any problem you may have, I'll be happy to help you, just. Please describe the problem you have in the best and more detailed way you can. Can you transmit? Do the top right buttons work. Do you have regular pulses on the display lines K1, K2, K4, K8, INT.

Do you have -8V where you should. Make sure you have the tech manual with the schematics, if you don't just ask me for it. Tell me if you have an oscilloscope or not. Consider that diagnosing and solving any problem requires you to have the guts to disassemble everything, are you confident with that. I cannot repair it because sending your equipment to Argentina is certainly not an option.