Yaesu FT-840 Service Manual
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Yaesu FT-840 Service Manual

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FT--840
Technical Supplement
YAESU MUSEN CO., LTD.
C.P.O. Box 1500, Tokyo, Japan
YAESU U.S.A.
17210 Edwards Rd. , Cerritos, CA 90701, U.S.A.
YAESU EUROPE B. V.
Snipweg 3, 1118AA Schipol, T he N etherla ri. ds

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  • Page 1 FT--840 Technical Supplement YAESU MUSEN CO., LTD. C.P.O. Box 1500, Tokyo, Japan YAESU U.S.A. 17210 Edwards Rd. , Cerritos, CA 90701, U.S.A. YAESU EUROPE B. V. Snipweg 3, 1118AA Schipol, T he N etherla ri. ds...

  • Page 2: Table Of Contents

    • • • YH-77ST Lightweight Headphones (option) ......7H-1 : \lfi! r--------------------------- FT-840 l \�/ Cut out the label to the right and place it Technical Supplement behind the clear plastic window in the spine of the manual binder. _ _ _ _ ______________________ _...
  • Page 3 This manual provides the technical infor­ the other has either a mixture of both chip and mation necessary for servicing the FT-840 hf leaded component (trimmers, coils, electro­ transceiver. It does not include information on lytic capacitors, packaged ICs, etc.), or leaded specifications, installation and opera ti on, components only.
  • Page 4 Multiplier code Ten unit 1/10 1.25 0.45 10° 1/16 1. 6 0.45 10 1 10 2 INDICATED LETTERS 1 2 3 4 10 6 5 Ii ' : 1 Q7 10° • Examples: 2.2kD 47 3 =47kD FT-840 Technical Supplement...
  • Page 5 Dispose of the chip when removed. OF). D After removing the chip, use the copper braid and soldering iron to which away any excess solder and smooth the land for in­ stallation of the replacement part. 1 -3 FT-840 Technical Supplement...
  • Page 6 Do not apply heat for more than 3 seconds. 0 Remove the tweezers and solder the elec­ trode on the other side in the manner just described. 1 -4 FT-840 Technical Supplement...
  • Page 7 D Next remove the connecting wire and co­ (photos 1 & 2). axial cables leading from the Main and Lo­ cal Units, then remove the PA Unit from the chassis (photo 6). Photo Photo 1 speaker cable Photo Photo Photo FT-840 Technical Supplement...
  • Page 8 Refer to the figure at the right for proper Flat-Head Screw screw identification and below for location. M3 x 6B Oval-Head, Binding Head Cover: Binding Head Bottom Cover: Oval-Head Screw Front Panel: Flat Head M3 x 6B FT-840 Technical Supplement...
  • Page 9 J 1 031, press the locking clamp pose the rear of the front panel assembly shut, and insert the bulb gently into the wiring and components (photo 9). mounting insert as before. FT-840 Technical Supplement...

  • Page 11: Alignment

    Alignment The following test equipment (and thor­ The FT-840 is carefully designed to allow ough familiarity with its correct use) is neces­ the knowledgeable operator to make nearly all sary for complete realignment. Correction of adjustments required for various station con­...
  • Page 12 02036, pin D Connect the D Tune the transceiver to 30.000.0 MHz, and select USB mode. Confirm a level of at least 2, and confirm the RF millivoltmeter indicates 640 mV. at least 110 m V. FT-840 Technical Supplement...
  • Page 14 1 kHz. 0 Set the RF PWR and MIC controls fully cw (max.), tune to 14.200.0 MHz, USB mode. D Key the transmitter and adjust VR1007 so that the meter (set to ALC), just begins to deflect FT-840 Technical Supplement...
  • Page 15 10 o'clock position and the D (b) Key the transmitter, and adjust the control fully clockwise (max.). Inject a 1-kHz level to where the ALC meter indication de­ flects no further. TC4001 LPF Unit Alignment Diagram FT-840 Technical Supplement...
  • Page 17 Beep Level J2021 T2004 T2005 TP2015 02044 TP2003 & & Carrier Level Adjust Freq. check Carrier Level Adjust Freq. check: check: Transmitter Carrier Point RF millivoltmeter(> 320 mV) millivoltmeter(> 65 mV) to chassis ground Local Unit Alignment Diagram FT-840 Technical Supplement...
  • Page 19 1-30MHz SW-D-UN IT .. 1 • 9-28MHz• L------------------� flFl .. 47.0SSMHz ...J • fL01 • frnx f1F1 _________ f IF2 B.2t5t-1Hz fL02 - flF1 - flF2 F3 - 455kHz • L--------------------r---� fL03 flF2 flF3 "" 4- 1 FT-840 Technical Supplement...
  • Page 20 C9501 UNLESS OTHERWISE NOTED. L.---- 0.001 50 B IN .11 F . SOY ; Vll7201-2 VR7101-2 SW-A-UN IT CAPAC L-----· · -----1 _________ (NO. 91 XXl F3394106 JP9101 P0030 1 OOW 19206322 M2 I 90QQ.( • ________ FT-840 Technical Supplement...
  • Page 21 MAIN Unit Circuit Diagram ---�� 1 OXXl <NO. MAIN-UNIT 11.83v AM MODE: 6.98V mode.: OV AllDl""c llOTE• llClllllTOl'I VALltUARE 111•.1 Cl.PACITOAYALUEll.lllt l lloF. SQY1 mc"1>#:.ITDll Y AL�AR�TUTALUll RX (TX) lllOl,ICTOll YALUE84'1f111K llllUB9 0 THDIWIBfllOT£D. ��, •• >!� � FT-840 Technical Supplement...
  • Page 23 ( 0 1 030, 1 034) 0 1 052, 1 059, 1 06 1 , (0 1 055) ( 0 1 075) 1 062, 1 064, 1 065, 1066, 1 079, 1 080, 1 081 , 1 084, 1088, 1 1 22 FT-840 Technical Supplement...
  • Page 24 Collector Pin 16 Base Emitter µ 2SA 1 56 3 ( R L ) PD4028BG ( 0 1 033, 1 039 ) ( 0 1 036) Collector Base Emitter I R3 M03A 2 S A 1 1 79 ( M 6 ) ( 0 1 05 1 ) ( 0 1 060, 1 062) Gate...

  • Page 25: Main Unit

    C 1 047 CH I P CAP. 1 50pF GRM40CH 1 5 1 J50PT K22170239 C 1 048 CH I P CAP. 1 50pF GRM40CH 1 5 1J50PT K22170239 C 1 050 AL. ELECTRO. CAP. l OuF 16V100M4X7TR2 K46 1 20004 5A-5 FT-840 Technical Supplement...
  • Page 26 C 1 1 0 1 CH I P CAP. 39pF GRM40CH390J50PT KZZ170225 C 1 1 02 AL. ELECTRO . CAP. l OuF 1 6V 16Vl OOM4X7TR2 K46 1 20004 C 1 1 03 AL. ELECTRO. CAP. l OuF 16V 1 00M4X7TR2 K46 1 20004 5A-6 FT-840 Technical Supplement...
  • Page 27 0. 0 0 l uF GRM408 1 02M50PT K22170805 C 1 1 56 CH I P CAP. 47pF GRM40CH470J50PT K221 70227 C 1 157 CH I P CAP. 0. luF GRM40B 1 04M25PT K221408 1 1 5A-7 FT-840 Technical Supplement...
  • Page 28 K22 1 7 1 004 C 1 209 CH I P CAP. 0. 047uF GRM40F473Z50PT K22 1 7 1008 C 1210 AL. ELECTRO. CAP. l OOuF 1 6V 1 6V 1 0 1 M6X7TR2 K46 1 20007 5A-8 FT-840 Technical Supplement...
  • Page 29 C 1 265 CH I P CAP. GRM40CH040C50PT K22 1 70205 C 1 266 CH I P CAP. GRM40CH040C50PT K221 70205 C 1 267 CH I P CAP. 0. 047uF GRM40F473Z50PT K22 1 7 1 008 5A-9 FT-840 Technical Supplement...
  • Page 30 D 1 0 34 D I ODE 1SS270TJ 82060004 D 1 035 D I ODE 1SS270TJ 82060004 D 1 036 D I ODE 1SS270TJ 82060004 D 1 037 D I ODE 1SV 1 57-T l 82060014 5A-10 FT-840 Technical Supplement...
  • Page 31 D 1095 D I ODE HZ7B l G2090229 D 1096 D I ODE 1 SS83RE G2050007 D 1097 D I ODE HZ7B l G2090229 D 1 098 D I ODE 1SS1 98TJ G20600 1 1 5A- 1 1 FT-840 Technical Supplement...
  • Page 32 J 1 022 CONNECTOR SC25-03WS P0090622 J 1 023 CONNECTOR HLJ052 1 -0 1 - 1 1 0 P 1 090593 J 1024 CONNECTOR S-Q3097-04 P 1 0 90354 J 1 025 CONNECTOR S-Q3097- 0 l P 1 090348 5A-12 FT-840 Technical Supplement...
  • Page 34 G l 0 9 1 620 Q 1 0 3 1 TRANS I STOR 2SC4047-TA G3340477 Q 1 032 TRANS I STOR 2SC4047-TA G3340477 Q 1 033 TRANS I STOR 2SA 1 563-TB G3 1 1 5638 5A-14 FT-840 Technical Supplement...
  • Page 35 R 1 0 1 7 CH I P RES. 2. 2K 1 / l OW 5% RMC 1/ l OT 222J J24205222 R 1 0 1 8 CH I P RES. 1/ lOW 5% RMC l/ l OT 330J J24205330 5A- 1 5 FT-840 Technical Supplement...
  • Page 36 RMC l / l OT 1 0 3J J2420 5 1 03 R 1 0 74 CH I P RES. 1 0 0 1 / l OW 5% RMC l / l OT l O l J J2420 5 1 0 1 5A-16 FT-840 Technical Supplement...
  • Page 37 R 1 126 CH I P RES. 1/lOW 5% RMC l / l OT 1 02J J24205 1 0 2 2. 2K 1/ lOW 5% RMC l / l OT 222J J24205222 R 1 127 C H I P RES. 5A- 1 7 FT-840 Technical Supplement...
  • Page 38 R 1 1 80 CH I P RES. l OOK 1 / l OW 5% RMC 1/ l OT 104J J2420 5 1 04 R 1 1 8 1 CH I P RES. 1/lOW 5% RMC l/ l OT 471J J2420547 1 5A-18 FT-840 Technical Supplement...
  • Page 40 R 1288 CH I P RES. 1 / l OW 5% RMC l / l OT 1 0 3J J24205 1 0 3 R 1 28 9 CH I P RES. 1/lOW 5% RMC l / l OT 820J J24205820 5A-20 FT-840 Technical Supplement...
  • Page 42 VR 1020 POT. 4. 7KB RH063MCS3R J5 1794472 XF lOOl XTAL 47M 1 5AU H 1 1 02090 XF1 002 XTAL XF-8. 2M-242-02 H1 1 0 2 1 28 CARD SPACER WLS-04-0 86000 1 9 1 5A-22 FT-840 Technical Supplement...
  • Page 43 �11 BREAK IN 8.!IJV BREAK IN OFF: OV BREAK IN BREAK IN 0FF: TONE ENC ON: 3.58V TONE ENC OFF: 2.21lV 1,�i1 OSC-UN I T "" TCXO (OPT I ON) r---------------------J RX (TX) � -------------------- 5 8-1 FT-840 Technical Supplement...
  • Page 45 TC74H C74AF 2SK302Y ( TY ) F 07924 ( 02025) ( 02026) ( 02027 ) ( 02034 '2040' 2046' 205 2 ) ( 02035) ( 02038 ) ( 0 2 0 2 3 ) TC74H C08AF ( 02060) FT-840 Technical Supplement...
  • Page 46 A node 2 Cathode Anode 1 Anode 2 Anode 1 1 SV 1 03 1 S S 1 84 ( 8 3 ) ( 02043,2045, 2047 ,2050) ( 0 205 1 ) Obverse View of Chip Side FT-840 Technical Supplement...
  • Page 47 K28179003 C 2047 CH I P CAP. O. O l uF GRM40F 1 03Z50PT K22 1 7 1 004 C 2048 CH I P CAP. O. O l uF GRM40F 1 03Z50PT K22 1 7 1004 58-5 FT-840 Technical Supplement...

  • Page 48: Local Unit

    K221 70235 C 2 1 02 CH I P CAP. l OOpF GRM40CH 1 0 1 J50PT K221 70235 C 2 1 03 CH I P CAP. l OOpF GRM40CH 1 0 1J50PT K221 70235 5 8-6 FT-840 Technical Supplement...
  • Page 49 0. 0 luF GRM40F 1 03Z50PT K22 1 7 1 004 C 2156 CH I P CAP. l OOpF GRM40CH 1 0 1J50PT K221 70235 C 2157 CH I P CAP. lOOpF GRM40CH 1 0 1J50PT K22170235 58-7 FT-840 Technical Supplement...
  • Page 50 C 221 9 CH I P CAP. 82pF GRM40CH820J50PT K221 70233 C 2220 CH I P CAP. 1 20pF GRM40CH 1 2 1J50PT K221 70237 C 222 1 CH I P CAP. 82pF GRM40CH820J50PT K221 70233 5 8-8 FT-840 Technical Supplement...
  • Page 51 D 2040 D I ODE 1 SS270TJ G2060004 D 2041 D I ODE 1 SS270TJ G2060004 D 2042 D I ODE 1 SS53-TB G2050008 D 2043 D I ODE lSV 1 0 3 (TPE4) G2050 0 1 3 5 8-9 FT-840 Technical Supplement...
  • Page 52 L 20 1 3 M. RFC 15uH LAP02TA 150K L l 790060 L 2014 M. RFC 3. 3uH LAP02TA3R3K L l 790052 L 2015 M. RFC lOOuH LAP02TA 1 0 1 K L l 790070 5 8-1 0 FT-840 Technical Supplement...
  • Page 54 1 / lOW 5% RMC l / l OT 683J J24205683 R 2024 CARBON F I LM RES. 1/6W RD 1 6TPJ103 J0722 5 1 03 R 2025 CARBON F I LM RES. 1/6W RD1 6TPJ471 J0722547 1 5 8-12 FT-840 Technical Supplement...
  • Page 56 RD1 6TPJ22 1 J07225221 R 2 1 4 1 CARBON F I LM RES. 1 /6W RD1 6TPJ22 1 J07225221 R 2 1 42 CARBON F I LM RES. 1 /6W RD 1 6TPJ221 J07225221 5 8-1 4 FT-840 Technical Supplement...
  • Page 57 RMC l / l OT 1 02J J24205102 R 220 1 CARBON F I LM RES. 1/6W RD1 6TPJ47 1 J07225471 R 2202 CH IP RES. 2. 2K 1/ lOW 5% RMC l / l OT 222J J24205222 58- 1 5 FT-840 Technical Supplement...
  • Page 58 T 2003 CO I L 44. 6M L0021862 T 2004 CO I L 8. 20M R 1 2-4043A L002 1 1 99 T 2005 CO I L 8. 20M R l 2-4043A L002 1 1 99 5 8- 1 6 FT-840 Technical Supplement...
  • Page 59 VCO CASE R0 1 24 1 20 SH I ELD PLATE R0 1 24 1 408 HEATS I NK PLATE R0 1408 108 CARD SPACER S6000 1 9 1 NYLON R I VET FNRP 3. 0X4. 5 S6000031 FT-840 Technical Supplement...

  • Page 61: Dds-1 Unit

    O bverse View of Component S ide Obverse View of ChipS ide o · Collector Pin 33 '"' Pin 23 Base Emitter F 07920 2SC27 1 2 GR ( L G ) ( 0250 1 ) ( 02502,2503) 5C-1 FT-840 Technical Supplement...
  • Page 63 RMC l / l OT 1 05J J2420 5 1 05 RB2501 BLOCK RES. RKM 1 0LG 1 03 RKM 10LG103 J40 9 0 0 1 70 R 0 1 3 1 630 SH I ELD CASE FT-840 Technical Supplement...
  • Page 64 :N"otes...
  • Page 65 Obverse View of ChipS ide "" � Collector Pin 33 Pin 1 Pin 1 1 Pin 23 Emitter Base F 07920 2SC27 1 2G R ( L G ) ( 0260 1 ) ( 02602,2603 ) 50-1 FT-840 Technical Supplement...
  • Page 67 J24205102 R 2609 CH IP RES. 1 / l OW 5% RMC 1/ l OT 105J J24205105 RB2601 BLOCK RES. RKM 1 0LG103 RKM 1 0LG 103 J40900 170 SH I ELD CASE R0 13 1 630 FT-840 Technical Supplement...
  • Page 68 :N"otes...

  • Page 69: Osc Unit

    J 270 1 CONNECTOR 5 1 24-04BHPB P 1 090426 TC2701 TRI MMER CAP. VCT5 1 E 1 1 7 K 9 1 000086 X 270 1 XTAL 10. 48576MHz H 0 1 02990 5 E- 1 FT-840 Technical Supplement...

  • Page 71: Reg Unit

    F339 2 1 03 Pr i nted C i rcu i t Board J 280 1 CONNECTOR 92 10B- 1 -06Z366-T P0090990 HA 17805P G 1 090936 Q 280 1 I C Q 2802 I C L7809 G 1 090778 FT-840 Technical Supplement...
  • Page 73 - - - - - - - - - - - - - - - - - - - - - - ( D S3001 ) Parts Layout Obverse V iew of Component S ide � Pin 32 L C7582 ( 0300 1 ) Obverse V iew of ChipS ide FT-840 Technical Supplement...

  • Page 75: Displayunit

    R 3005 CH I P RES. l OOK 1 / l OW 5% RMC 1/ 1 OT 1 04J J2420 5 1 04 TP30 0 1 TP-M I PS- 1 145 Q5000052 TP3002 TP-M I PS- 1 145 Q5000052 FT-840 Technical Supplement...
  • Page 76 :N"otes...
  • Page 77 L- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - � Parts Layout Obverse View of Component S ide Obverse View of Solder S ide 5H-1 FT-840 Technical Supplement...
  • Page 79 K l 3 1 79009 C 4046 CERAM I C CAP. 0. 047uF DD 1 1 0F473Z50 K 1 3 1 79009 C 4047 CERAM I C CAP. 0. 047uF DD 1 1 0F473Z50 K l 3 1 79009 5 H-3 FT-840 Technical Supplement...
  • Page 80 RL40 1 2 RELAY DC 1 2V AG20 1 3 M 1 1 90045 RL4013 RELAY DC9V AGP20 1 7 M 1 1 90087 TC40 0 1 TR I MMER CAP. 20pF ECV 1ZW20X32 K 9 1 0000 1 3 FT-840 Technical Supplement...

  • Page 81: Lpf Unit

    JUMPER W I RE A (6 pcs) 0. 8-7. 5 Q6 1 00004 JUMPER W I RE A (7 pcs) 0. 8 - 1 0 . 0 Q6 100005 PLT- lM BK- 1 83000022 W I RE B I ND (3 pcs) FT-840 Technical Supplement...
  • Page 83 R E S I STER VALUES ARE I N Q , l /6W : C A P A C I T OR VALUES ARE P F . I N DUCTOR VALUES ARE UNLESS OTHERW I SE NOTED. 51-1 FT-840 Technical Supplement...
  • Page 85 PA Unit Parts Layout � Base Collector (Heet S ink) Emitter - - m1tter Collector 2SC2 1 66 2SC3 133 2SC3240 ( 0500 1 ) (05002 , 5003) ( 05004,5005) i . . . Besa Obverse View of Component S ide Bese Collector Collector...

  • Page 87: Pa Unit

    K 1 0276682 C 5047 CERAM I C CAP. 0. 047uF UP050F473Z-A-B K28 1 79002 D 5001 D I ODE l l ES l G2090499 D 5002 D I ODE l l ESl G2090499 5 1 -5 FT-840 Technical Supplement...
  • Page 88 ERX-1SJ5R6P J22309030 R 5021 CARBON F I LM RES. 1/4W RD14T J 1 02 J 0 1 245102 R 5022 CARBON F I LM RES. l O K 1/6W RD 1 6TPJ 103 J07225 103 5 1-6 FT-840 Technical Supplement...
  • Page 89 5H2 R I B 1 6-32 L0022236 TH5001 THERM I STOR SDT lOOO 890900 1 1 TP5001 TP-G MK 1 095 Q5000036 Q5000036 TP5002 TP-G MK 1 095 VR5001 POT. EVN-DXAA03B 1 3 J 5 1 783102 5 1-7 FT-840 Technical Supplement...
  • Page 90 5 1-8 FT-840 Technical Supplement...

  • Page 91: Vr-A/-B/-C/-D Unit

    Obverse View of Component Side Obverse View of Solder Side Obverse View of Component Side Obverse View of Solder Side Obverse View of Component Side Obverse View of Solder Side Obverse View of Component Side Obverse View of Solder Side 5J-1 FT-840 Technical Supplement...
  • Page 93 VR D UN I T PCB w i th Components CS 1 3070 0 1 Pr i nted C i rcu i t Board F3394 105 VR7401 POT. l OKB RK097 1 1 1 0 J6080 0 1 9 1 5J-3 FT-840 Technical Supplement...
  • Page 94 Notes...
  • Page 95 Obverse View of Component S ide Obverse View of Component S ide Obverse View of Sol der S i de Obverse V iew of Component Side Obverse View of Solder S ide Obverse View of Solder S ide 5 K-1 FT-840 Technical Supplement...

  • Page 97: Sw-A/-B/-C/-D Unit

    S 920 1 PUSH SW I TCH S 9202 PUSH SW I TCH SPH 1 2 1A94 N4090086 S 9203 PUSH SW I TCH SPH 1 2 1A94 N4090086 S 9204 PUSH SW I TCH SPH 1 2 1 A94 N4090086 FT-840 Technical Supplement...
  • Page 98 S 9402 TACT SW I TCH N5090047 EVQ-333 H=9. 5 S 9403 TACT SW I TCH EVQ-333 H=9. 5 N5090047 S 9404 TACT SW I TCH EVQ-333 H=9. 5 N5090047 S 9405 TACT SW I TCH EVQ-333 H=9. 5 N5090047 FT-840 Technical Supplement...

  • Page 99: Mic Unit

    Pr i nted C i rcu i t Board K28 1 7900 1 C 950 1 CERAM I C CAP. O. O O l uF UP050B 102K-A-B FM214-8SS (A) P0090 1 58 J 950 1 CONNECTOR JP950 1 W I RE-ASSY T9206306 FT-840 Technical Supplement...

  • Page 101: Phone Unit

    PHONE UN I T PCB w i th Components CA 1 05900 1 Pr i nted C i rcu i t Board F3394 1 0 1 J 9601 CONNECTOR S-G46 17#03 P 1 09035 1 JP9601 W I RE-ASSY T9206304 FT-840 Technical Supplement...

  • Page 103: Exploded View & Miscellaneous Parts

    5 (-Lot 2) U03308001 EMS SCREW ASM3 U20304001 BINDING HEAD SCREW M3 4 (Lot 3- R4500271A HANDLE END (2pcs) MAIN UNIT R0807580 R0145630 STAND Non-designated parts are avai labia only as part of a s1gnated assembly. 6 - 1 FT-840 Ti .L-...
  • Page 105 CAPAC I TOR VALUES ARE • F . UNLESS OTHERW I SE NOTED . Parts Layout Obverse View of Component S ide Obverse View of Chip S ide Collector Base Emitter 2SC27 1 2G R (LG) ( 0280 1 ) FT-840 Technical Supplement...
  • Page 107 Parts List VALUE YAESU P / N VERS. REF. MFGR ' S DES I G TOL. DESCR I PT I ON TCX0-4 P r i nted C i rcu i t Board F3337 1 0 1 A K22 1708 1 7 C 2801 CH I P CAP.

  • Page 109: Fm Unit-747 (Option)

    Obverse View of Component S ide Collector Collector � � Base Emitter Base Emitter 2SC27 1 2 G R ( L G ) DTC1 1 4 E K ( 24 ) ( 08004,8005) ( 08006) Obverse View of Chip Side 78-1 FT-840 Technical Supplement...
  • Page 111 8 10 9 0 1 45 Q 8003 I C M5223P 8 1 090749 Q 8004 TRANS I STOR 2SC271 28R TE85R 83327 1 278 Q 8005 TRANS I STOR 2SC271 28R TE85R 833271 278 7 8-3 FT-840 Technical Supplement...
  • Page 112 J5 1 745 103 VR8003 POT. 4. 7K H065 1A01 1 -4. 7KB J5 1 745472 X 8001 XTAL 8. 6708MHz HC-49/U 3P H0 1 02855 X 8002 XTAL 8. 2 1 58MHz HC-49/U 3P H0 1 02854 FT-840 Technical Supplement...
  • Page 113 C 8302 CERAM I C CAP. O. O luF J 8301 CONNECTOR 5 1 24-04BHPB P 1 0 90426 J 8302 CONNECTOR 5 1 24-04BHPB P 1 0 90426 XF- 1 1 2A H 1 1 02230 XF830 1 XTAL 7C-1 FT-840 Technical Supplement...
  • Page 115 EP050Y 1 0 3N-A C 8202 CERAM I C CAP. 5 124-04BHPB P 1 090426 J 8201 CONNECTOR 5 1 24-04BHPB P 1090426 J 8202 CONNECTOR XF- 1 1 2C 8 1 1 02231 XF8 2 0 1 XTAL FT-840 Technical Supplement...
  • Page 117 L - - - - - - - - - - - - - - - - � � - - - - - - - - - - - - - - - - Interface Unit Circuit Diagram Poosos23 U521BAL 7 E-1 FT-840 Technical Supplement...
  • Page 119 ( 0 1 00 1 , 1 009) ( 0 1 002) ( 0 1 003) ( 0 1 005) ( 0 1 006 ) ( 0 1 008) BA 1 A4P ( 0 1 004, 1 00 7 ) 7 E-3 FT-840 Technical Supplement...
  • Page 121 J 1 005 CONNECTOR SC25-05WS P0090624 J 1007 CONNECTOR CSK-M50-08 R4 1-0576F P 1 090804 J 1008 CONNECTOR SC25-06WS P0090625 J 1009 CONNECTOR SC25-04WS P0090623 J 1 0 1 0 CONNECTOR SBRK 2S- 1 P 1 090812 7E-5 FT-840 Technical Supplement...
  • Page 123 REF. MFGR ' S DES I G TOL. TC 100 1 TRI MMER CAP. 20pF ECV 1 ZW20X32 K 9 1 000013 TP100 1 TP-G MK1095 Q5000036 VRlOO l POT. EVN-DXAA03854 J 5 1 783503 7 E-7 FT-840 Technical Supplement...
  • Page 124 :N"otes...
  • Page 125 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - � 7E-9 FT-840 Technical Supplement...
  • Page 127 FC-10 (option) Collector Base Emitter DTC1 1 4 E K (24) 0640 1 , 6402, 6403 6404, 6405, 6406 6407, 6408, 641 4 Cathode 1,2 Anode Anode 2 HSM2838 (A6) 06402, 6403, 6404 6405, 6406, 6407 6408, 6409...
  • Page 129 D 6406 D I ODE HSM2838-TR G2070 1 0 8 D 6407 D I ODE HSM2838-TR G207 0 1 08 D 6408 D I ODE HSM2838-TR 82070108 D 6409 D I ODE HSM2838-TR 8207 0 1 08 7E-1 3 FT-840 Technical Supplement...
  • Page 130 M 1 1 90075 RL6403 RELAY DC 1 2V AGP2003 M 1 1 90075 RL6404 RELAY DC 12V AGP2003 M 1 1 90075 RL6405 RELAY DC 1 2V AGP2003 M 1 1 90075 7 E- 1 4 FT-840 Technical Supplement...
  • Page 131 AGP2003 RL64 1 4 RELAY DC 1 2V AGP2003 M 1 1 90075 YV- 1 25-05 K90000049 VC640 1 T R I MMER CAP. 1 25pF YV- 1 25-05 K90000049 VC6402 TR I MMER CAP. 1 25pF FT-840 Technical Supplement...
  • Page 133 FC-10 (option) Tuner Control Unit Circuit Diagra , - ------------------------------- ----- TlJ£R-CNTL �IT F3248000A 00521 t-e3763PF-G-8t<J L.6503 100U o. 47 26V IJ6520 1SS270 ..eos T 93 � r. . w 1 P0 09J : I � R66l lO Cl6517 ..a5 10 M37450M4-634FP P1090210 <D �...
  • Page 135 P in Pin 65 Pin 6 4 Pin 1 I \' I \' Droin Collector Source Boso Pin 2 4 Pin 41 Goto Emitter Pin 25 Pin 40 M37450E4FP MY-021 µ PC7808H 2S K 1 04J 2SC290 1 L (065 1 7 ) (06520) (0650 1 , 6502) ( 06503 , 6504 )
  • Page 137 0. 047uF GRM40F473Z50PT K22 1 7 1 008 C 6546 CH I P CAP. O. O luF GRM40B1 03M50PT K22 1708 1 7 C 6547 CH I P CAP. 0. luF GRM40B104M25PT K221408 1 1 7 E-21 FT-840 Technical Supplement...
  • Page 138 D 6506 D I ODE 1 SS97 G209 0 1 1 8 D 6508 D I ODE HSM2838-TR G207 0 1 0 8 D 6 5 0 9 D I ODE 1 SS97 G209 0 1 1 8 7 E-22 FT-840 Technical Supplement...
  • Page 139 Q 6 5 1 9 TRANS I STOR FA 1A4P-T2B G3070006 Q 6520 I C UPC7808H G 1 090294 Q 6521 I C MB3763PF-G-BND-TF G l 0 9 1 224 Q 6522 I C MB3763PF-G-BND-TF G 1 0 9 1 224 7 E-23 FT-840 Technical Supplement...
  • Page 140 R 6551 CH I P RES. 1/lOW 5% RMC l / l OT 333J J24205333 R 6552 CH I P RES. l OK 1/ lOW 5% RMC l / l OT 1 03J J24205 1 03 7 E-24 FT-840 Technical Supplement...
  • Page 142 UN I VERSAL JO I NT (2pcs) 1 1 6-4 S 1 0 00003 W I RE B I ND PLT - l M BK- 1 S3000022 M I N I CLAMP (2pcs) MN-2 S6000293 7 E-26 -- FT-840 Technical Supplement...
  • Page 145 - - - - A--- --, WH I TE R E D B L A C K GREEN 680ohms P . T . T � ORAN GE D W N B L U E Viewed From "A" Side FT-840 Technical Supplement...
  • Page 146 ---- -- -- -- - REAR CASE $ 81 001 86 SLI DE SWITCH<TONE) $ 8000631 REAR NAME PLATE 8 8000506 HANGER $ 8000649 $ 8000671 SCREW SCREW Non-designated parts are available only as part of a designated assembly. FT-840 Technical Supplement...
  • Page 147 Weight: Base � 630g Microphone � 250g M D-1ca M icrophons 20000 1000 2000 5000 10000 FREOUENCY(Hz) Circuit Diagram WHITE BLACK +- = LOCK FST i UP i YELLOW ORANGE DWNi BLUE BLACK ORANGE BROWN BLUE YELLOW FT-840 Technical Supplement...
  • Page 148 MIC GRILL COVER 88000487 SWITCH PLATE PIPE ---- -- 88000653 ADPT SCREW Non-designated parts are available only as part of a designated assembly. 88000661 STAND BASE S8000660 BOTTOM COVER 881 00029 PTT SWITCH 88000664 SCREWC4pcs) 88000658 88000677 7G-2 FT-840 Technical Supplement...

  • Page 149: Yh-77St Lightweight Headphones (Option)

    103dB /mW ± 3dB Sensitivity: bar ) ( OdB = 0.0002 µ Speaker Maximum Input: 50m W YH-77ST Lightweight Headphones Circuit Diagram WH I TE I I '--( S H I EL D S H I E L D FT-840 Technical Supplement...
  • Page 150 Notes �· I--. <:J � \ � <:J <::: :'.! -- - � � � � ---.c: :i � � <:::. . � 's. ;;1 � � �\ �· � � ""i- \ � � � �\ � � "' �...
  • Page 151 Yvo Muniz Alpha Telecom Agosto...
  • Page 152 YA ESU No portion of this manual may be 1993 Copyright <D reproduced without the permission Yaesu Musen Co. , Ltd. of Yaesu Musen Co. , Ltd. rights reserved (31 l C-OY) Printed in Japan. E05559000...

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