FT-757GX ALIGNMENT LOCAL Unit A. Third LO BPF Remove P17 and connect a 50-ohm load across 3rd LO OUT jack J2008, along with the RF voltmeter. Set the transceiver to CW mode, and while receiving, adjust T2001 and T2002 for maximum deflection on the voltmeter (50 mVrms nominal). B. SSB, AM, CW RX LO Level Connect the RF voltmeter to pin 2 of Q2012 and adjust TC2002 so that the difference in level between CW transmit and receive is less then 5 mVrms at this point (output level approximately 100 mVrms). C. 45 MHz Bandpass Filter With the transceiver set to the 14 MHz band, connect the Rf voltmeter to TP2006 and adjust T2009 and T 2010 for maximum voltmeter deflection (more then 80 mVrms). D. 60 MHz Bandpass Filter Set the transceiver to 21 MHz band, and with the RF voltmeter connected as in the previous step, adjust T2011 and T2012 for maximum deflection (more the 80 mVrms). E. 45 MHz Trippler Return the transceiver to the 14 MHz band, and connect the RF voltmeter to TP2002. Adjust T 2006 and T2007 for maximum deflection (more the 80 mVrms). F. 15 MHz Reference Frequency Connect the frequency counter to TP2002 and adjust TC2006 for 45 MHz ñ 20 Hz. G. 2nd Local Oscillator Frequency 1. Connect the frequency counter to TP2007, and tune the transceiver so that the display indicates 14.000.00. Adjust VR2006 so that the counter shows 32.06000 MHz ñ 20 Hz. 2. Retune the transveiver so that the display shows 13.999.99, and adjust VR2014, if necessary, to obtain 32.05901 MHz on the counter. Now retune the transceiver to 14.000.00 and check that the difference in the frequencies shown on the counter are within 990 Hz ñ 5 Hz. H. Carrier Point Connect the frequency counter to J2008 and adjust the component indicated in the corresponding mode for the frequency shown below: ÚÄÄÄÄÄÄÂÄÄÄÄÄÄÄÄÄÂÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿ ³MODE ³ ADJUST ³ COUNTER FREQUENCY ³ ÃÄÄÄÄÄÄÅÄÄÄÄÄÄÄÄÄÅÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ´ ³LSB ³ TC2005 ³ 8213.400 kHz (ñ50 Hz)³ ³CW ³ TC2004 ³ 8215.900 kHz (ñ10 Hz)³ ³USB ³ TC2005 ³ 8216.600 kHz (ñ50 Hz)³ ÀÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ I. BFO Frequency Set the transceiver to a CW mode, and connect the frequency counter to pin 2 of Q2012. Adjust TC2001 while receiving for 15.000700 MHz (ñ10 Hz) on the counter. J. FM/AM Carrier Frequency 1. Set the transceiver to the FM mode, and connect the frequency counter to J2007. Adjust VR2004 while transmitting for 8.215000 MHz (ñ50 Hz) on the counter. 2. Rotate the AM CAR control (VR2008) fully clockwise, and that the transceiver to the AM mode. Close the PTT line and check the counter for 8.215000 MHz ñ300 Hz. K. Carrier Level Set the transceiver to the LSB mode, and connect the RF voltmeter to TP2001. Close the PTT line and adjust TC2003 for 90 mVrms(ñ5mV). L. Carrier Balance With the transceiver set to LSB mode, connect the RF voltmeter to J2007 and adjust VR2001 for minimum voltage on the meter. M. AM Carrier Level 1. With the RF voltmeter connected to J2007, set the mode to CW, key the transmitter, and note the voltage indicated on the meter (approximately 200mVrms). 2. Return to receive, switch the mode to AM, close the PTT line and adjust AM CAR control VR2008 for exactly half of the voltage noted in the provious step. N. PLL Subloop (PLL-1) VCC 1. Connect the hi-Z DC voltmeter to TP2003 and tune the trnansceiver fo 14.499.00 on the display. Adjust T2008 for 5.5 V on the meter. 2. Retune the transceiver for a display of 14.500.00, and check for 2 to 3 volts on the meter. O. 41 and 56 MHz Bandpass Filter 1. Connect the RF voltmeter to TP2004 and tune the transceiver for 14.250.00 on the display. adjust T2014 through T2017 for maximum deflection on the voltmeter (more than 60 mVrms). 2. Retune the transceiver to 21.250 MHz, and adjust T2018 through T2021 for maximum deflection on the voltmeter (more than 60mVrms). P. Main PLL (PLL-2) VCC 1. Connect the hi-Z DC voltmeter to TP2005 and tune the transceiver to the frequencies shown in the following chart, adjusting the corresponding transformer for 1.5 volt on the meter. Then retune the transceiver to the corresponding "check" frequency, and check for 5 to 6 volt on the meter. ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÂÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿ ³ ADJUSTMENT (for 1.5V) ³ CHECK (for 5-6V)³ ÃÄÄÄÄÄÄÄÄÄÄÄÂÄÄÄÄÄÄÄÄÄÄÄÄÅÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ´ ³ Freq.(MHz)³ Transformer³ Freq. ( 5-6V) ³ ³ 0.500 ³ T2023 ³ 7.499 ³ ³ 7.500 ³ T2024 ³ 14.499 ³ ³ 14.500 ³ T2025 ³ 21.499 ³ ³ 21.500 ³ T2026 ³ 29.999 ³ ÀÄÄÄÄÄÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ 2. Check for proper VCC control by tuning between the adjustment and check frequencies in each of the above four ranges, using the tuning knob or mikrophone scanning buttons, and watching the DC voltmeter for smooth voltage change unevenly, or jumps, a fault is indicate. Q. 2nd Local Level Connect the RF voltmeter to J2009. Adjust T2003 through T2005 for maximum RF voltage on the meter (at least 110 mVrms). R. IF Shift Zero Point Set 1. Connect the frequency counter to J2009, and with the Shift and Width control centered, note the counter frequency while receiving. The key the transmitter and adjust VR2007, if necessary, so that the frequency shown on the counter is within 50 Hz of that shown while receiving. 2. While receiving, check the total adjustment range of the shift control in USB, LSB and CW, which should by approximately ñ1.3 kHz as shown on the counter. If not, adjust L2011 (not more than 90ø in either direction), and then repeat adjustments H, I and J (Carrier Point, BFO Frequency and FM/AM Carrier Frequency), and then this check again. S. VOX Gain Preset 1. Preset VR2011 fully clockwise, and that the VOX GAIN control on the rear panel fully clockwise. Connect the AF signal generator to the PATCH jack, and apply a 1 kHz signal at 1 mV to check to see if the transmitter activates. 2. Now rotate the VOX GAIN control fully counterclockwise, and slowly adjust VR2011 counterclockwise to the point where the transmitter returns to receive, and then a little further counterclockwise from this point. T. SSB Carrier Point Check 1. With the AF generator connected as in the previous step, set the transceiver to the 14 MHz band, USB mode. Close the PTT line and adjust the MIC gain controls for 100 watts output (into the dummy load/wattmeter). For the 10-watt model FT-757SX, divide all power output by 10. 2. Reduce the frequency of the audio generator whiole watching the wattmeter, to obtain 25 watt output. Check that the audio frequency is below 350 Hz. 3. Now increase the frequency of the AF generator so that the power output rises to full power and then down to 25 again above 2 kHz. Check that the audio frequency is now above 2900 Hz. 4. Return to receive, switch to LSB, and repeat the above checks in this mode. If 25 watts output is not obtained outside the specified frequency in any of these checks, repeat the Carrier point (H) and the the IF Shift Zero Point (R) procedures. U. FM Modulation 1. With the test equipment connected as shown in the following diagram, preset VR2002 fully clockwise, and set the AF generator for 10 mV output at 1 kHz. Set the transceiver to FM. 2. Adjust VR2003 for ñ5 kHz deviation (ñ100 Hz), and the reduce the AF generator output level to 1.5 mV, and adjust VR2002 for ñ3.5 kHz deviatin (ñ100 Hz). 3. Recheck deviation with 10 mV audio, and repeat the above step until deviation is within the specified ranges for both audio levels. ---EOF--- Qeulle: YAESU MUSEN CO.,LTD