Yaesu FT-757GX II Technical Supplement Download

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CAPAC ITORS

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5 pF

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. .

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1 5 pF

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22 pF

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30 pF

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1 26 1

- 53 -

Summary of Contents for FT-757GX II

Page 1: ...FT 757GX TECHNICAL SUPPLEMENT YAESU MUSEN CO LTD C P 0 BOX 1500 TOKYO JAPAN...

Page 2: ...ser digitalizado por PY2TKI Marcos Digitalizado em 23 de Novembro de 2020 por Alexandre Tabajara Souza PU2SEX http www tabalabs com br http tabajara labs blogspot com MANUAL DE DISTRIBUI O GRATUITA Re...

Page 3: ...NMENT 12 SEMICONDUCTOR LOCATIONS 22 SIGNAL PATHS 24 COMPONENT APPLICATIONS 28 FP 757GX HD SCHEMATIC DIAGRAMS 33 CONNECTION DIAGRAM 34 PARTS LAYOUTS SCHEMATICS SIGNAL LEVELS AND VOLTAGE CHARTS RF UNIT...

Page 4: ......

Page 5: ...Amplifier Connections The two lower interconnection diagrams on page l 9 do not show the connections for the changeover relay closure delay signal INH in the FT 757GX which is required in order to pro...

Page 6: ...d unless you have the correct desoldering equipment spring loaded clamp and all pin desoldering tip If you do lift a trace don t worry Read on to find out how to repair traces like a pro NOTES ON USE...

Page 7: ...ring to terminal posts Be certain to apply heat to both post a nd wire EXAMPLES OF POOR SOLDERING PRACTICE Unwanted solder bridge con necting two tracks caused by 1_ a __ use of too much solder Cold j...

Page 8: ...ed 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 temperat...

Page 9: ...grams below and on the following pages indicate the changes to be carried out on the PA Unit and RF Unit during the following steps J2010 P41 _ 5 l LOCAL UNIT INH CD SPLICE 1 Referring to page 1 1 dis...

Page 10: ...J6003 P42 Component side IOOWPA UNIT Component side RF UNIT 7 Blue ToRFUNIT I 06010 J6004 P48 From LOCAL UNIT Blue...

Page 11: ...ot 6 onwards as well as in some of the later sets in Lot 5 1 Disconnect the power supply and remove the bottom cover of the transceiver to gain access to the component side of the RF Unit 2 Re ferring...

Page 12: ...hen they are designed for use with one specific microcomputer The EXT CNTL jack also provides access to the receiver AGC line for application in user s programs FT 757GX EX CNTL JACK BUFFER AGC LINE S...

Page 13: ...ng knob the D LOCK command can be programmed to be sent to the transceiver during external control operation XCVR COMMAND BYTE CODES No I 2 3 4 5 6 7 8 9 10 II DATA FUNCTION COMMAND I 2 3 4 5 SPLIT x...

Page 14: ...anel forward To remove the RF Unit the KEY jack nut must be removed using a special wrench see your Yaesu agent Disconnect the following plugs from their corresponding jacks on the RF UNIT 127 P14 121...

Page 15: ...laced Those who do undertake any of the following alignments are cautioned to proceed only at their own risk Yaesu must reserve the right to change circuits and alignment procedures in the interest of...

Page 16: ...ne wattmeter Resistive dummy load 50 ohms l 50W three re quired for SWR Tumdown alignment RF signal generator covering 1 30 MHz with calibrated output levels from 5 dB to 100 dB AF signal generator wi...

Page 17: ...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...

Page 18: ...03 VR2001 J2008 T2002 T2001 TC2001 VR2004 VR2003 02012 VR2002 VR 2005 Chassis Top View LOCAL Unit Adjustment Locations 1 5 VR2010 VR2011 T2ol 4 T2ol 7 T201s T2021 T2012 T2010 T2011 T2009 L2011 TP2004...

Page 19: ...t the frequency counter to J2009 and with the Shift and Width controls centered note the counter frequency while receiving Then key the transmitter and adjust VR2007 if necessary so that the frequency...

Page 20: ...in the following diagram preset VR2002 fully clockwise and set the AF generator for 1 0 mV output at 1 kHz Set the transceiver to FM 2 Adjust VR2003 for 5 kHz deviation 100 Hz and then reduce the AF g...

Page 21: ...antenna jack and adjust VR1001 for an S meter deflection of S 1 2 Increase the RF signal level to 100 dB and adjust VR1011 so that the S meter indicates just to full scale G Noise Blanker Connect the...

Page 22: ...09 T1012 Ql016 T1013 T1010 T101s L1044 T101s VR1001 T1015 Q102s T1019 I Chassis Bottom View R F Unit RX Adjustment Locations 1 9 VR1010 T1006 Jumper 2nd Local check T1022 Tloos T 1004 T1023 VR1011 T10...

Page 23: ...ockwise and adjust VR1006 for 100 watts output 10 watts for FT 757SX D PO Meter At 14 MHz CW mode press the MOX button and adjust the DRIVE control for 100 watts output on the external wattmeter Set t...

Page 24: ...t Idling Current Remove the jumper shown in the following figure and connect the DC milliammeter 500 mA range in place of the jumper With the transceiver set to an SSB mode and with no audio applied t...

Page 25: ...Q20l 2 r r Q20ll 1 r Q2025 T i r w Q2003 r Q2009 fi Q2027 ff f7 Q200 r rz Q2002 i I Q2001 in T N N 0 N cr N O M M 1 tC l U l 1 1 U l U l 1 1 0 0 0 0 0 0 0 0 0 0 0 N U l 1 N I ID 1 Ql056 QI 055 Ql06l...

Page 26: ...DISPLAY UNIT 0 DIAL UNIT Inside Front Panel 23...

Page 27: ...DELl Li2sc38ovI I Y2sc386v 3SK73GR 1 t i2sc386Y t H2sc386v 1 t 12sc38ov 1 l2sc1oa230I r I ev AGC REM CAT 0VT 34 t C 4 Ir r r Q67 f C5805G2 CPU I2SA7 33AcI F I BPF I I l2s 7 33AQI I 2SC380Y I I r RECEI...

Page 28: ...12Sc38ovl I Y 2Sc366Y f 135K73GRl t 12Sc386v1 i 2Sc386v 1 12Sc38ovh I AN6 552 I MTR AMP ev ii I C i r 1 1 I I AOC REH CAT OIJT 2ie 1 01 2r l2Sc1 9230I 2SC458B BUFF 2n LO MJX 1 MP 067 l C6805G2 CPU l2...

Page 29: ...UT f l H N a SPKR TX8V 100W PA UNIT 1100W l ODELl RX8V av CAT OJT 10W PA UNIT 110W l ODELl j 131 AOR 0ATA1 0ATA2 0ATA3 67 1 1C8805G2 CPU RECEIVE TRANSMIT CONTROL FT 757GX SX BLOCK DIAGRAM w C z l r c...

Page 30: ...M4t Ox3 _ tiHi z aRiO f x2 4 7 _ 2S t ft ilKtaM2 i 2SC380YI I 1 2SC380Y 3SK73GR l l 2SC380Y 1 t i 25C380Y 1 1 i 2SC380Y 1 i HKt07112r 12sc g2301 I I i L t t t li 4 4 ev AGC REM CAT OUT Q07 l C6805G2 C...

Page 31: ...reset Q10 15 RX NB Gate Sw Switch Q1016 3SK73GR MOSFET RX 3rd Mixer D1003 Q10 1 7 RX 3rd I F Amp D1004 BPF to TX RF Preamp Q1018 Switch TX 8V Q1019 2SC3 80TMY NPN Si TR RX AGC Amp D1005 Ql020 RX AGC B...

Page 32: ...HZ4B3 Zener Diode RF AGC Threshold Set Dl055 D1 105 MA190 Si Diode Non FM Squelch Hang D1056 RX 3rd IF SSB CW Timer Ceramic Filter Sw Dll06 HZ3C1 Zener Diode NB AGC Limiter D105 7 D1 107 MA190 Si Diod...

Page 33: ...SC535 B NPN Si TR PLLl IF Amp D2003 MA190 Si Diode TX FM IDC Switch Q203 1 MC145 145 CMOS IC PLLl Prog Div and D2004 Phase Detector 02005 TX AF Amp Disable Q20 3 2 2SK192AGR JFET 34 3 9MHz VCO Switch...

Page 34: ...ode PLL Ref Triple In Sw Switch Bias D2046 PLL Ref Quadruple D2093 CPU Oock Reset Sw lnput Switch D2094 PLLl Unlock Diode D2047 45MHz PLL Ref Triple OR Output Switch D2095 PLL2 Unlock Diode D2048 60MH...

Page 35: ...6008 Reverse Voltage 040 1 5 VFO A B Switch Isolator 04016 M VFO Switch D6009 PTT 1 3 5V Diode OR D40 1 7 SPLIT Switch D60 10 PWR Relay Back Pulse 040 1 8 MR Switch Canceller 040 1 9 VFO M Switch 0601...

Page 36: ...I R39 R35 7 Sk 2 7k C37 t 0 0 25V c1 o o12sv 0 0 R37 R38 D 1 k 1 0k o jIll C36 0 09 1 R33 N 50V I H I 1 0 0 R28 120 R34 C34 47 25V C24 o pJ R13 1k R27 120 2W _ 4 l r t o g O O t 630V l H I Ul r c _ U...

Page 37: ...I7ll a 1 1 7 I VR 1 N l j i i i o J10141 P8205l 5k9 r u 1 L t 1 1 14 RF UN IT 5 2 1 Jl O 2 _ _ _ I 1 J e 1 8 F 2 5 5 1 0009 No 1 xxx 1 n WID Tli _6 o l l l r o l21 1 C _k9 i l 0i24 S P28 z 3 L J I y...

Page 38: ...IN No 0 1 002 0 1 022 0 1 029 0 1 029 0 1 030 0 1 037 0 1 046 0 1 05 1 0 1 054 0 1 060 0 1 060 I I 2 I I 3 8 1 1 8 l I r 1 91 0 0 5 2 7 0 j 1 3 4 1 4 7 3 I I 34 8 0 3 1 3 4 1 s o _ 9 1 J I t 1 9 0 ISS...

Page 39: ...I 6 1 l 7 1 l I 0 3 7 I 6 2 6 2 1 9 1 9 0 9 0 9 3 2 3 2 1 2 1 2 3 2 3 2 o I o 7 9 7 9 7 9 7 9 1 3 3 IN 1 3 3 0 8 7 3 0 0 7 9 7 9 OUT 1 3 2 1 1 3 3 1 3 3 3 1 7 1 7 4 2 3 1 7 9 7 3 I 7 3 I 7 5 7 5 1 2 6...

Page 40: ..._ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ J HZ493 J37 Q29 1 2 AN6552 MA OO Fl 27 1 O 37 Fl l 44 NB SW NB VR 2 1r 2 r __lr Y l lL C202 M I CAPAC I TORS ARE MYLAR F I LM 5 0 w v I s r I CAPAC I TOR...

Page 41: ...IN 1 0 MC1 4028B CP MC14042B CP MC14510BCP SN74LS1 45N PIN 7 MC140 1 1 BCP SN765 14N Av AN855 1 PIN 1 6 P I N 1 4 PIN S J i n H D 1 0551 P PIN S PIN PIN 1 NOTCH SN 1 89 1 3P GNO i PC78L05 2SA733AP 2SC...

Page 42: ...LOCAL U N IT PARTS LAYOUT solder side 39...

Page 43: ...02025 3 2 3 2 7 7 7 7 2 3 2 3 02026 2 9 2 9 I 7 5 7 5 3 7 3_7 02028 0 5 I 0 5 7 9 7 9 0 7 0 7 I I 02030 1 5 1 5 5 4 5 4 2 3 2 3 02032 1 0 1 0 7 5 7 5 0 0 02033 2 9 2 9 7 5 7 5 3 7 3 7 02034 3 1 3 1 7...

Page 44: ...7 MARKER ON OFF 02029 2 5 0 3 5 3 5 7 1 0203 1 0 7 2 02035 0 0 0 4 9 4 9 4 9 02037 7 1 02040 7 8 2 5 3 9 3 9 02042 0 6 9 0206 1 7 8 1 4 7 2 3 9 0 0 9 2 8 1 4 02064 0 0 0 0 0 0 0 0 0 0 0 5 1 02065 0 0...

Page 45: ...DE S I GNATED OTI ERWISE ARE TYPE 2SC4589 OIOOES NOT DESIGNATED OTI E RWISE ARE TYPE gQ T R I 2SA733APx4 BLOS 1 RE VALLE I S NOT SPEC I F I E D CAPACITORS ARE o 0 1 uF EXCEPT THOSE RKED I CH ARE 0 02...

Page 46: ...I I I I I I I I l I I I I I I 2 2 L l 3 RO 22 C 3 9 C S O C 58 C 5 9 0 0 4 7 00 1 006 1 5 1 5 5 5 1 3 SV 1 3 SV ATT Rt 0 1 I P03 J 1 034 1 f i t 1 21 _ _ t __ 1 fi t _ _ f __ 1 t K I 1l i 5 i I I I R...

Page 47: ...00 1 02 00 08 1 21 2 5 I 51 SSS 008 tt J D csesoOE 1 50p O o _ U 0 S03 S04 n ID LOCK 1 VFO I if fili ill iVFO M I t o 0 n 0 ii EMITTER PIN 40 2SA733AO 2SC496Y TMS2370 PI N 1 DISPLAY UNIT VOLTAGE CHART...

Page 48: ...1 6 D O 5 1 5 5 5 002 I 5 1 5 5 5 00 1 R09 1 00 k IO _ C e l s r 0 0 2 o 1 6 MC 1 4 584B 00 1 1 4 f C 1 4 0 1 1 8 1 4 f C 1 40 1 1 B l C 1 40 1 38 1 00 k I OO O p 6 00 1 1 4 f C 1 4 0 1 1 8 00 1 1 4...

Page 49: ...1 00W PA U N IT PARTS LAYOUT Component side Solder side 44...

Page 50: ...OUTPUT GROU N D PC7808H T L7705 I OOW PA UNIT VOLTAGE CHART DC VOLTS E S c D B G R T R T R T 06001 0 4 1 3 5 1 2 06002 0 1 3 5 0 7 06003 0 1 3 5 0 7 06004 0 1 3 5 0 7 06005 0 1 3 5 0 7 06006 IN 1 3 4...

Page 51: ...1 0W PA U N IT PARTS LAYOUT 46 Component side Solder side...

Page 52: ...I I I I I I M 1_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _3_ _ _ _ _ l h P I N 7 M C 1 40 1 1 BCP 2SD8820 I I I I I I I NPUT PC78 L08 COLLECTOR 2SC458D 2SD892 R EMITTER _ _ _ _ _ _ _ _ _ _ _ _ _ J 47 BASE P...

Page 53: ...ACE B G MARK I SPACE 08001 AUTO 0 I 5 0 08001 MANUAL 4 5 I 5 0 l 0 00 1 SP _ A_C E j o 0 o t j_ 5 0 0800 1 MARK 4 5 4 5 4 8 4 8 l I 5 0 08003 0 I 0 0 I 6 8 0 1 I 0 08002 4 9 0 o I r 1 KEYER UNIT F2560...

Page 54: ...SWITCH U N IT A Component Side Solder Side SWITCH U N IT B KEVER CONTROL U N IT Component Side Component Side Solder Side Solder Side 49...

Page 55: ...MEMO 50...

Page 56: ...37 Gl090494 MB3 7 1 3 SPl M409006 1 SS 70T Ql05 8 Gl090294 PC7808H Ql060 Gl09006 8 MC140 1 1 B SW ITCH Sl N0 1 90 1 26 SRN 24 Q F ETS Ql003 1004 1 006 G380 1 250 2SK1 25 1008 1 040 1049 LAMPS QlOlO 1...

Page 57: ...SJ 5 6kn XF1002 H1 102050 8 2M20 R1279 J01 215562 1 8W TJ 5 6kn XF1003 OPTION H1102079 XF 8 2M 01 01 CW R1 147 1 149 1 21 9 102245682 1 4W SJ 6 8kn XF1004 H1102080 XF 8 2M 272 01 SSB R1005 1017 1030...

Page 58: ...3 10KB lOk nB 1 1 01 1 1 1 2 1 1 15 VR1012 150705 102 EVNA1AAOOB13 1KB lk nB 1 1 19 1 1 20 1 123 1 1 24 1 133 1 144 CAPAC ITORS 1 149 1 15 1 1 166 C1 167 K06 172030 Ceramic Disc sowv UJ 3 pF 1 168 1 1...

Page 59: ...02 L0021 222 11003 101 1 101 2 P0090192 B3B XH A Ll003 1050 1052 Ll l901 75 LHL06NA10 1K lOO H 1014 1018 1027 105 7 1036 1037 11020 1021 1032 P0090193 B4B XH A 1039 1101 7 1035 P00901 94 B5 B XH A L10...

Page 60: ...14 2219 2221 2222 2227 2229 2241 2269 228 1 23 1 2 R2101 21 24 2169 J02245 15 1 R2285 2300 101 245221 R2027 102245221 R205 7 J02245271 R2135 2240 2274 J02245 331 R2100 102245391 R23 1 7 J01 245471 1 1...

Page 61: ...6 l Sk 11 RB2002 2003 J40900023 l 8kn 2 2kn VR2001 J5 l 739103 2 7kn VR2002 2003 2005 J5 1 745 103 3 3kn VR2004 2007 J5 l 745 223 3 3kn VR2006 J5 l 760103 3 3kn VR2008 J50709103 4 7k 11 VR2009 2010 20...

Page 62: ...fiD104UJ430J50V 2307 C2081 2249 K00 175470 SL 47 pF C20 1 7 2021 2022 K13 1 79010 0 022 F ffiD104SL470J50V 2045 2048 205 1 DD108F223Z50V C2207 K06 175470 UJ 47 pF 2054 2056 2058 DD104UJ470J50V 2060 20...

Page 63: ...5 1K 270 H L0020746 L11900 1 7 FL5H102K lmH L1 190163 LHL06NA100K lO H L119015 1 LHL06NA1ROM l H L1 190134 S4 180K 18 H L2290147 S4 270K L1190155 LHL06NA2R2M L1190161 LHL06NA6R8K Lll90 159 LHL06NA4R7K...

Page 64: ...0J500V 68 pF DD09SL680J500V 75 pF DD09SL750J500V 82 pF DD09SL820J500V 100 pF DD09SL101 JSOOV 1 1 0 pF DD09SL1 1 1 JSOOV SOWV F O Ol F DD106Fl03Z50V 0 047 F DDllOF473Z50V TR I M M E R CAPACITOR ECV1ZW1...

Page 65: ...KEG10904 0 1 2 CON N ECTO RS Q6008 J4001 P0090191 B2B XHA Q6009 P4001 with wire T9204726A XHP 1 1 Q6001 P4002 T9204727A XHP 4 Q6002 6003 Q6004 6005 Q6007 D I A L U N IT Q6010 Symbol N o Part No Name...

Page 66: ...W SJ lk n T6001 3 9k n T6002 4 7k n T6003 lOk n 22k n 150k n lM n R16001 TJ l M n SJ l 5 M n J6002 6004 6005 POTENTIOMET E R 6008 Hl05 1A004 1 KB lk nB J6006 J6003 J6001 6007 CAPACITORS Dipped Mica so...

Page 67: ...9 2 2KB 2 2knB Symbol No Part No N ame Descri ption F2S60000 Printed Circuit Board C02S600A PCB with Components CAPAC ITORS C7012 K30276680 Dipped Mica soowv 68 pF LCQ12680KS ICS C7009 701 1 K30276221...

Page 68: ...on Q000001 2 6A FT 75 7SX F2561000 Printed Circuit Board C025610A PCB with Com onents K E V PLUG P0090008 SH3603 R ESISTOR R810l 100215 101 Carbon Film l 8W VJ 100 n RCA PLUG P0090018 STP 58 POT ENTIO...

Page 69: ...ment SW 12030S470 Metallic film lW 12030S l01 10024S 102 Carbon film v w 1203SS 163 Metallic film 3W 12033S 102 2W 10024S l l l Carbon film v w 10024S l21 10024S l03 10024S202 10024S 1 23 10024S272 10...

Page 70: ...YA E SU v E3 8 9 0 1 8 4 E 2 8 4 0 6 P...

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