Yaesu FT-891 Technical Supplement
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Yaesu FT-891 Technical Supplement

50mhz
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See also: Advanced Manual , Reference Book
HF/50MHz TRANSCEIVER
FT-891

Introduction

This manual provides the technical information necessary
for servicing the FT-891 HF/50MHz TRANSCEIVER.
Servicing this equipment requires expertise in hand-
ing surface-mount chip components. Attempts by non-
qualified persons to service this equipment may result
in permanent damage not covered by the warranty, and
may be illegal in some countries.
Two PCB layout diagrams provided for each double-
sided board in this transceiver. Each side of the board
is referred to by the type of the majority of components
installed on that side ("Side A" or "Side B"). In most
cases one side has only chip components, and the other
has either a mixture of both chip and leaded components
(trimmers, coils, electrolytic capacitors, ICs, etc.), or
leaded components only.
While we believe the information in this manual to be
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.
This transceiver was assembled using Pb (lead) free solder, based on the RoHS specification.
Only lead-free solder (Alloy Composition: Sn-3.0Ag-0.5Cu) should be used for repairs performed on this apparatus. The solder stated
above utilizes the alloy composition required for compliance with the lead-free specification, and any solder with the above alloy com-
position may be used.
Risk of explosion if battery is replaced by an incorrect type. Dispose of used batteries according to the instructions.
Technical Supplement
Alignment
Board Unit (Schematics, Layouts & Parts)
Important Note
Caution
EH065H90D
©2017 YAESU MUSEN CO., LTD.

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  • Page 1 SW-B Unit While we believe the information in this manual to be VR Unit 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.

  • Page 2: Specifications

    ±5.0 kHz (Wide) ±2.5 kHz (Narrow) Spurious Radiation: Better than -50 dB (1.8 MHz - 30 MHz Amateur bands) Better than -63 dB (50 MHz Amateur bands) Microphone Impedance: 600 Ohms (200 Ohms to 10 k Ohms) FT-891 Technical Supplement SPECIFICATIONS-1...
  • Page 3 4 Ohms to 16 Ohms (8 Ohms: nominal) Conducted Radiation: Less than 4 nW Specifications are subject to change, in the interest of technical improvement, without notice or obligation, and are guaranteed only within the amateur bands. FT-891 Technical Supplement SPECIFICATIONS-2...
  • Page 4 SEMS SCREW HSM4X10NI ⑤ U24306001 BIND HEAD TAPTITE-B M3X6 ⑥ U31206007 OVAL HEAD SCREW M2.6X6B Non-designated parts are available only as psrt of a designated assembly. RA607510A ③ SUB PANEL ASSY T9101530A CT CABLE ③ EXPLODED VIEW-1 FT-891 Technical Supplement...
  • Page 5 BIND HEAD TAPTITE-B M2.6X8B ④ U03305002 SEMS SCREW ASM3X5NI ⑤ U31206007 OVAL HEAD SCREW M2.6X6B ⑥ U20305007 BINDING HEAD SCREW M3X5B ⑦ U9900144 BINDING HEAD SCREW M3X7B Non-designated parts are available only as psrt of a designated assembly. EXPLODED VIEW-2 FT-891 Technical Supplement...
  • Page 6 KNOB MAIN ASSY ② U24108001 BIND HEAD TAPTITE-B M2X8(3) ③ U24105001 BIND HEAD TAPTITE-B M2X5(3) ④ U24206001 BIND HEAD TAPTITE-B M2.6X6 RA6074700 RUBBER RING(MAIN) Non-designated parts are available only as psrt of a designated assembly. EXPLODED VIEW-3 FT-891 Technical Supplement...
  • Page 7 Block Diagram BLOCK DIAGRAM-1 FT-891 Technical Supplement...
  • Page 8 Connection Diagram CONNECTION DIAGRAM-1 FT-891 Technical Supplement...
  • Page 9 Alignment Preparation & Precautions A 50-ohm RF Dummy load and in-line wattmeter Yaesu must reserve the right to change circuits and must be connected to the ANT jack in all proce- alignment procedures in the interest of improved dures that call for transmission, except where spec- performance, without notifying owners.
  • Page 10 DC voltmeter (13.8 V).  Press and hold in the [ F ] key to save the new setting and exit the alignment mode. J5017 FT-891 Technical Supplement ALIGNMENT-2...
  • Page 11 [ MULTI ] function knob per the chart right, and setting and exit the alignment mode. adjust the listed components on the LOCAL Unit for the required voltage, or confirm that the correct voltage is present on each alignment menu item. TP1009 L4002 L4004 L4006 FT-891 Technical Supplement ALIGNMENT-3...
  • Page 12 U n i t f o r m a x i m u m d e f l e c t i o n o n t h e R F millivoltmeter. J1002 TP1022 T1016 T1014 T1013 TP1041 T1023 FT-891 Technical Supplement ALIGNMENT-4...
  • Page 13  Press and hold in the [ F ] key to save the new [ RF/SQL ] knob so that the RF millivoltmeter setting and exit the alignment mode. reading is “+10.0 dBm ±0.5 dBm” (Lot. 1-10) or “+9.0 dBm ±0.5 dBm” (Lot. 11-). TP1005 FT-891 Technical Supplement ALIGNMENT-5...
  • Page 14 Note: If the S-meter deflects while adjusting, reduce the RF Signal Generator output so reduce the RF Signal Generator output so that the S-meter does not deflect. that the S-meter does not deflect. T1011 T1012 T1005 FT-891 Technical Supplement ALIGNMENT-6...
  • Page 15  Adjust VR1001 on the MAIN Unit so that the Digital DC voltmeter reading is “1.2 V ±0.2 V”.  Press and hold in the [ F ] key to save the new setting and exit the alignment mode. TP1016 VR1001 FT-891 Technical Supplement ALIGNMENT-7...
  • Page 16 21.200 MHz -1.5 dB +10 dBµ knob (±0.5 dB) 51.900 MHz [ AF ] knob 0 dB +36 dBµ 04-05 IGC 50 51.900 MHz [ RF/SQL ] 51.900 MHz -1.5 dB +7 dBµ knob (±0.5 dB) FT-891 Technical Supplement ALIGNMENT-8...
  • Page 17 “S-9+60”.  Press the [ CLAR ] button to save the new setting.  Press and hold in the [ F ] key to save the new setting and exit the alignment mode. FT-891 Technical Supplement ALIGNMENT-9...
  • Page 18  Press the PTT switch, adjust T1025 on the spurious (69.450 MHz) for minimum deflection on the Spectrum Analyzer.  Release the PTT switch.  Disconnect the Spectrum Analyzer from J1002, then re-connect the coaxial cable to J1002. J1002 T1025 FT-891 Technical Supplement ALIGNMENT-10...

  • Page 19: Pa Unit Adjustment

     Disconnect the jumper plugs from J5005.  Connect the DC ammeter to J5005.  Press and hold the PTT switch, while adjust VR5002 so the DC ammeter reading is “1.0 A (±0.1 A)”. VR5004 VR5002 VR5003 J5005 VR5001 J5001 J5003 FT-891 Technical Supplement ALIGNMENT-11...
  • Page 20 RF Power output to 50 W on the Wattmeter.  Press the PTT switch, adjust TC5001 for minimum deflection on the DC voltmeter (less than 0.3 V).  Release the PTT switch. TP5003 TC5001 FT-891 Technical Supplement ALIGNMENT-12...
  • Page 21  Rotate the [ MULTI ] function knob to select the alignment menu item “10-10 I-ALC 50” for the 50 MHz amateur band's ALC Adjustment. alignment menu item “10-05 I-ALC 14” for the 14 MHz amateur band's ALC Adjustment. FT-891 Technical Supplement ALIGNMENT-13...
  • Page 22 “11-15 5W TXG 1.8” per the chart at the below.  Rotate the [ RF/SQL ] knob for maximum deflection on the ALC meter zone, then press the [ CLAR ] key, while pressing and holding in FT-891 Technical Supplement ALIGNMENT-14...
  • Page 23 14-13 5W FALC 10 5 W (±1 W) – – Press the [ PTT ] switch 14-14 5W MTR 10 – – ø Maximum deflection Rotate the [ RF/SQL ] knob 14-15 5W TXG 10 – – FT-891 Technical Supplement ALIGNMENT-15...
  • Page 24 18-13 5W FALC 24 5 W (±1 W) – – Press the [ PTT ] switch 18-14 5W MTR 24 – – ø Maximum deflection Rotate the [ RF/SQL ] knob 18-15 5W TXG 24 – – FT-891 Technical Supplement ALIGNMENT-16...
  • Page 25  Rotate the [ RF/SQL ] knob to set the parameter is “200”.  Release the PTT switch, then press and hold in the [ F ] key to save the new setting and exit the alignment mode. FT-891 Technical Supplement ALIGNMENT-17...
  • Page 26 [ RF/SQL ] knob for 50 W ±3 dot on the PO meter.  Release the PTT switch, then press and hold in the [ F ] key to save the new setting and exit the alignment mode. FT-891 Technical Supplement ALIGNMENT-18...
  • Page 27 “24-10 SWR-MTR2.0 50”.  Rotate the [ RF/SQL ] knob to set the parameter is “120”.  Rotate the [ MULTI ] function knob to select the alignment menu item to “24-11 SWR-MTR3.0 50”. FT-891 Technical Supplement ALIGNMENT-19...
  • Page 28 MAIN Unit (Lot. 1 - 3) Circuit Diagram FT-891 Technical Supplement MAIN-1...
  • Page 29 MAIN Unit (Lot. 1 - 3) Parts Layout (side A) FT-891 Technical Supplement MAIN-2...
  • Page 30 MAIN Unit (Lot. 1 - 3) Parts Layout (side B) FT-891 Technical Supplement MAIN-3...
  • Page 31 MAIN Unit (Lot. 4 - 6) Circuit Diagram FT-891 Technical Supplement MAIN-4...
  • Page 32 MAIN Unit (Lot. 4 - 6) Parts Layout (side A) FT-891 Technical Supplement MAIN-5...
  • Page 33 MAIN Unit (Lot. 4 - 6) Parts Layout (side B) FT-891 Technical Supplement MAIN-6...
  • Page 34 MAIN Unit (Lot. 7 - 10) Circuit Diagram FT-891 Technical Supplement MAIN-7...
  • Page 35 MAIN Unit (Lot. 7 - 10) Parts Layout (side A) FT-891 Technical Supplement MAIN-8...
  • Page 36 MAIN Unit (Lot. 7 - 10) Parts Layout (side B) FT-891 Technical Supplement MAIN-9...
  • Page 37 MAIN Unit (Lot. 11 - ) Circuit Diagram FT-891 Technical Supplement MAIN-10...
  • Page 38 MAIN Unit (Lot. 11 - ) Parts Layout (side A) FT-891 Technical Supplement MAIN-11...
  • Page 39 MAIN Unit (Lot. 11 - ) Parts Layout (side B) FT-891 Technical Supplement MAIN-12...

  • Page 40: Main Unit

    K22084803 C 1080 CHIP CAP. 10pF GRM1882C1H100JA01D K22174211 C 1081 CHIP CAP. 0.01uF GRM188B11H103KA01D K22174823 C 1082 CHIP CAP. 10pF GRM1882C1H100JA01D K22174211 C 1083 CHIP CAP. 10pF GRM1882C1H100JA01D K22174211 C 1084 CHIP CAP. 10pF GRM1882C1H100JA01D K22174211 FT-891 Technical Supplement MAIN-10...
  • Page 41 GRM188B11H102KA01D K22174821 C 1163 CHIP CAP. 0.1uF GRM188B11E104KA01D K22144814 C 1164 CHIP CAP. 0.1uF GRM188B11E104KA01D K22144814 C 1165 CHIP CAP. 0.1uF GRM188B11E104KA01D K22144814 C 1166 CHIP CAP. GRM1882C1H9R0DA01D K22174210 C 1167 CHIP CAP. 0.1uF GRM188B11E104KA01D K22144814 FT-891 Technical Supplement MAIN-11...
  • Page 42 GRM1882C1H100JA01D K22174211 C 1246 CHIP CAP. 0.01uF GRM188B11H103KA01D K22174823 C 1247 CHIP CAP. 0.001uF GRM1882C1H102JA01D K22174275 C 1249 CHIP CAP. GRM1882C1H5R0CA01D K22174206 C 1250 CHIP CAP. 33pF GRM1882C1H330JA01D K22174223 C 1252 CHIP CAP. 68pF GRM1882C1H680JA01D K22174231 FT-891 Technical Supplement MAIN-12...
  • Page 43 C 1322 CHIP CAP. 10uF GRM188R61E106MA73D K22144818 1-10 C 1323 CHIP CAP. 0.1uF GRM188B11E104KA01D K22144814 C 1324 CHIP CAP. 0.001uF GRM188B11H102KA01D K22174821 C 1325 CHIP CAP. 0.01uF GRM188B11H103KA01D K22174823 C 1326 CHIP CAP. 10uF GRM188R61E106MA73D K22144818 FT-891 Technical Supplement MAIN-13...
  • Page 44 GRM188B11H102KA01D K22174821 C 1391 CHIP CAP. 15pF GRM1882C1H150JA01D K22174215 C 1392 CHIP CAP. 0.01uF GRM188B11H103KA01D K22174823 C 1393 CHIP CAP. 0.01uF GRM188B11H103KA01D K22174823 C 1394 CHIP CAP. 0.01uF GRM188B11H103KA01D K22174823 C 1395 CHIP TA.CAP. TMCMA1V105MTRF K78160032 FT-891 Technical Supplement MAIN-14...
  • Page 45 K22144814 C 1468 CHIP CAP. 0.1uF GRM188B11E104KA01D K22144814 C 1469 CHIP CAP. 10uF GRM188R61E106MA73D K22144818 C 1469 CHIP CAP. 10uF GRM188B31A106ME69D K22104810 C 1470 CHIP CAP. 10uF GRM188R61E106MA73D K22144818 C 1470 CHIP CAP. 10uF GRM188B31A106ME69D K22104810 FT-891 Technical Supplement MAIN-15...
  • Page 46 K22174805 C 1539 CHIP CAP. 470pF GRM188B11H471KA01D K22174805 C 1540 CHIP CAP. 470pF GRM188B11H471KA01D K22174805 C 1541 CHIP CAP. 470pF GRM188B11H471KA01D K22174805 C 1542 CHIP CAP. 470pF GRM188B11H471KA01D K22174805 C 1543 CHIP CAP. 470pF GRM188B11H471KA01D K22174805 FT-891 Technical Supplement MAIN-16...
  • Page 47 0.1uF GRM188B11E104KA01D K22144814 C 1605 CHIP TA.CAP. 47uF TAJC476M016RNJ K78120125 C 1606 CHIP CAP. 0.1uF GRM188B11E104KA01D K22144814 C 1607 CHIP TA.CAP. 100uF TMCMC1A107MTRF K78100075 C 1608 CHIP CAP. GRM21BB31E105KA98L K22140826 C 1609 AL.ELECTRO.CAP. 1000uF 25CE1000BS K48140025 FT-891 Technical Supplement MAIN-17...
  • Page 48 K22174823 C 1683 CHIP CAP. 0.0033uF GRM1882C1H332JA01D K22174281 C 1684 CHIP CAP. 0.0022uF GRM1882C1H222JA01D K22174279 C 1685 CHIP CAP. 0.0022uF GRM1882C1H222JA01D K22174279 C 1686 CHIP CAP. 0.01uF GRM188B11H103KA01D K22174823 C 1687 CHIP CAP. 0.01uF GRM188B11H103KA01D K22174823 FT-891 Technical Supplement MAIN-18...
  • Page 49 GRM1882C1H680JA01D K22174231 C 1769 CHIP CAP. 0.1uF GRM188B11C104KA01D K22124805 C 1770 CHIP CAP. GRM188B31E105KA75D K22144815 C 1771 CHIP CAP. 0.01uF GRM188B11H103KA01D K22174823 C 1772 CHIP CAP. 0.01uF GRM188B11H103KA01D K22174823 C 1773 CHIP CAP. 0.01uF GRM188B11H103KA01D K22174823 FT-891 Technical Supplement MAIN-19...
  • Page 50 1SS355 TE-17 G2070470 D 1068 DIODE 1SS355 TE-17 G2070470 D 1069 DIODE 1SS355 TE-17 G2070470 D 1070 DIODE D1F60-5053 G2071240 D 1071 DIODE HN1D04FU G2071576 D 1072 DIODE 1SS355 TE-17 G2070470 D 1073 DIODE DA221M T2L G2070940 FT-891 Technical Supplement MAIN-20...
  • Page 51 L1690602 FB1043 FERRITE BEADS BLM18BD182SN1D L1690602 FB1044 FERRITE BEADS BLM18BD182SN1D L1690602 FB1045 FERRITE BEADS BLM18BD182SN1D L1690602 FB1046 FERRITE BEADS BLM18BD182SN1D L1690602 FB1047 FERRITE BEADS BLM18BD182SN1D L1690602 FB1048 FERRITE BEADS BLM18BD601SN1D L9190143 FB1049 FERRITE BEADS BLM18BD601SN1D L9190143 FT-891 Technical Supplement MAIN-21...
  • Page 52 C2520C-R33G-RA L1691300 L 1048 CHIP COIL 0.082uH C2520C-82NG-RA L1691293 L 1049 CHIP COIL 100uH NLV25T-101J-PF L1691779 L 1050 CHIP COIL 0.47uH C2520C-R47G-RA L1691302 L 1050 CHIP COIL 0.22uH C2520C-R22G-RA L1691298 L 1051 M.RFC 0.1uH 0805CS-101XGLC L1691634 FT-891 Technical Supplement MAIN-22...
  • Page 53 DTC114EUA T106 G3070084 Q 1036 TRANSISTOR DTC114EUA T106 G3070084 Q 1037 CD74HC238PWR G1094275 Q 1038 TRANSISTOR UMD3N TR G3070211 Q 1039 TRANSISTOR UMD3N TR G3070211 Q 1040 CD74HC238PWR G1094275 Q 1041 MB85RS256APNF-G-JNERE1 G1094985 Q 1042 PE4259-63/TR G1095102 FT-891 Technical Supplement MAIN-23...
  • Page 54 TRANSISTOR 2SC4215Y(TE85R.F) G3342157Y Q 1116 TRANSISTOR 2SC4215Y(TE85R.F) G3342157Y Q 1117 TRANSISTOR DTC114EUA T106 G3070084 Q 1118 TRANSISTOR DTC114EUA T106 G3070084 Q 1119 TRANSISTOR 2SC4081 T106 R G3340818R Q 1120 LA4425A-E G1092241 Q 1121 TRANSISTOR 2SD1628-TD-E G3416288 FT-891 Technical Supplement MAIN-24...
  • Page 55 RMC1/16S 474JTH J24189057 R 1040 CHIP RES. 4.7k 1/16W RMC1/16SK472FTH J24189488 R 1041 CHIP RES. 1/16W RMC1/16S 103JTH J24189037 R 1042 CHIP RES. 470k 1/16W RMC1/16S 474JTH J24189057 R 1043 CHIP RES. 470k 1/16W RMC1/16S 474JTH J24189057 FT-891 Technical Supplement MAIN-25...
  • Page 56 RMC1/16 470JATP J24185470 R 1119 CHIP RES. 1/16W RMC1/16 000JATP J24185000 R 1120 CHIP RES. 1/16W RMC1/16 470JATP J24185470 R 1121 CHIP RES. 1/16W RMC1/16 330JATP J24185330 1-10 R 1122 CHIP RES. 1/2W RMC1/2 6R8JCTP J24275689 FT-891 Technical Supplement MAIN-26...
  • Page 57 1/16W RMC1/16 2R2JATP J24185229 R 1199 CHIP RES. 1/16W RMC1/16 2R2JATP J24185229 R 1200 CHIP RES. 1/16W RMC1/16 101JATP J24185101 R 1201 CHIP RES. 1/16W RMC1/16 153JATP J24185153 R 1202 CHIP RES. 1/16W RMC1/16 103JATP J24185103 FT-891 Technical Supplement MAIN-27...
  • Page 58 J24189021 R 1285 CHIP RES. 100k 1/16W RMC1/16 104JATP J24185104 R 1286 CHIP RES. 1/16W RMC1/16 223JATP J24185223 R 1288 CHIP RES. 100k 1/16W RMC1/16 104JATP J24185104 R 1289 CHIP RES. 2.2k 1/16W RMC1/16 222JATP J24185222 FT-891 Technical Supplement MAIN-28...
  • Page 59 RMC1/16 152JATP J24185152 R 1364 CHIP RES. 1/16W RMC1/16 223JATP J24185223 R 1365 CHIP RES. 4.7k 1/16W RMC1/16 472JATP J24185472 R 1366 CHIP RES. 1/16W RMC1/16 103JATP J24185103 R 1367 CHIP RES. 1/16W RMC1/16 471JATP J24185471 FT-891 Technical Supplement MAIN-29...
  • Page 60 RMC1/16 563JATP J24185563 R 1441 CHIP RES. 1/16W RMC1/16 100JATP J24185100 R 1442 CHIP RES. 4.7k 1/16W RMC1/16 472FTP J24183472 R 1443 CHIP RES. 1/16W RMC1/16 103JATP J24185103 R 1444 CHIP RES. 1/16W RMC1/16 330FTP J24183330 FT-891 Technical Supplement MAIN-30...
  • Page 61 1/16W RMC1/16 683FTP J24183683 R 1521 CHIP RES. 1/16W RMC1/16 153FTP J24183153 R 1522 CHIP RES. 1/16W RMC1/16 103JATP J24185103 R 1523 CHIP RES. 1/16W RMC1/16 470JATP J24185470 R 1524 CHIP RES. 1/16W RMC1/16 333JATP J24185333 FT-891 Technical Supplement MAIN-31...
  • Page 62 RMC1/16 332FTP J24183332 R 1599 CHIP RES. 1/16W RMC1/16 103JATP J24185103 R 1600 CHIP RES. 330k 1/16W RMC1/16 334FTP J24183334 R 1601 CHIP RES. 150k 1/16W RMC1/16 154FTP J24183154 R 1602 CHIP RES. 1/16W RMC1/16 102JATP J24185102 FT-891 Technical Supplement MAIN-32...
  • Page 63 4.7k 1/16W RMC1/16 472JATP J24185472 R 1678 CHIP RES. 1/16W RMC1/16 000JATP J24185000 R 1679 CHIP RES. RMC1 470JTE J24305470 R 1685 CHIP RES. 1/16W RMC1/16 000JATP J24185000 R 1691 CHIP RES. 1/16W RMC1/16 000JATP J24185000 FT-891 Technical Supplement MAIN-33...
  • Page 64 T 1015 BALUN TRANSFOMERS #617DS-1710 L0190275 T 1016 COIL 05RF M5-N1 R12-T661Y L0022674 T 1017 BALUN TRANSFOMERS #458PT-1917 L0023156 T 1018 BALUN TRANSFOMERS #458PT-1586 L0190276 T 1020 BALUN TRANSFOMERS #458PT-1917 L0023156 T 1021 BALUN TRANSFOMERS 080812771A L0023078 FT-891 Technical Supplement MAIN-34...
  • Page 65 XTAL FILTER 1D69412GQ2 69.45MHZ H1102496 SHIELD CASE (37x30.5) RA6079500 SHIELD CASE COVER (37x30.5) RA1152400 SHIELD CASE (21x40.5) RA6079300 SHIELD CASE COVER (21x40.5) RA6079400 SHIELD PLATE RA6091600 BUSTERAID (12.5X10) RA6115700 BUSTERAID (12.5X10) RA6115700 4-10 INSULATOR WASHER RA085830A FT-891 Technical Supplement MAIN-35...

  • Page 66: Local Unit

    LOCAL Unit Circuit Diagram FT-891 Technical Supplement LOCAL-1...
  • Page 67 LOCAL Unit Parts Layout side A side B FT-891 Technical Supplement LOCAL-2...
  • Page 68 K22148834 C 4073 CHIP CAP. 0.01uF GRM188B11H103KA01D K22174823 C 4074 CHIP CAP. 22pF GRM1552C1H220JA01D K22178220 C 4075 CHIP CAP. 0.01uF GRM155B11E103KA01D K22148834 C 4076 CHIP CAP. 0.001uF GRM188B11H102KA01D K22174821 C 4077 CHIP TA.CAP. 4.7uF TMCMA1C475MTRF K78120031 FT-891 Technical Supplement LOCAL-3...
  • Page 69 UPC2709TB-E3 G1095238 Q 4010 ADF4116BRUZ(TAPE) G1093581 Q 4011 UPC2709TB-E3 G1095238 Q 4012 TRANSISTOR DTA144EU T106 G3070079 Q 4013 TRANSISTOR 2SC4215Y(TE85R.F) G3342157Y Q 4014 AD9834BRUZ-REEL7 G1094297 Q 4015 TRANSISTOR DTC144EUA T106 G3070041 Q 4016 TRANSISTOR 2SC4215Y(TE85R.F) G3342157Y FT-891 Technical Supplement LOCAL-4...
  • Page 70 CHIP RES. 100k 1/16W RMC1/16S 104JTH J24189049 R 4060 CHIP RES. 1/16W RMC1/16S 333JTH J24189043 T 4001 BALUN TRANSFOMERS #617DS-1710 L0190275 T 4002 BALUN TRANSFOMERS #458PT-1565 L0190273 SHIELD CASE PLL RA6079100 SHIELD CASE COVER (PLL) RA6079200 FT-891 Technical Supplement LOCAL-5...
  • Page 71 PA Unit Circuit Diagram FT-891 Technical Supplement PA-1...
  • Page 72 PA Unit Parts Layout (side A) FT-891 Technical Supplement PA-2...
  • Page 73 PA Unit Parts Layout (side B) FT-891 Technical Supplement PA-3...
  • Page 74 K22140811 C 5134 CHIP CAP. 0.1uF GRM21BB11E104KA01L K22140811 C 5135 CHIP CAP. 0.001uF GRM188B11H102KA01D K22174821 C 5136 CHIP CAP. 0.01uF GRM188B11H103KA01D K22174823 C 5137 CHIP CAP. 0.0068uF GRM216B11H682KA01D K22170815 C 5139 CHIP CAP. 0.01uF GRM188B11H103KA01D K22174823 FT-891 Technical Supplement PA-4...
  • Page 75 CHIP CAP. 12pF 250V GRM21A5C2E120JW01D K22240302 C 5245 CHIP CAP. 15pF 250V GRM21A5C2E150JW01D K22240303 C 5246 CHIP CAP. 12pF 250V GRM21A5C2E120JW01D K22240302 C 5248 CHIP CAP. 250V GQM2195C2E8R0DB12D K22240251 C 5251 CHIP CAP. 180pF 250V GRM21A5C2E181JW01D K22240316 FT-891 Technical Supplement PA-5...
  • Page 76 K22174215 C 5359 CHIP CAP. 0.01uF GRM188B11H103KA01D K22174823 C 5360 CHIP CAP. 0.001uF GRM188B11H102KA01D K22174821 C 5361 CHIP CAP. 0.001uF GRM188B11H102KA01D K22174821 C 5362 CHIP CAP. 0.1uF GRM188B11E104KA01D K22144814 C 5364 CHIP CAP. 0.001uF GRM188B11H102KA01D K22174821 FT-891 Technical Supplement PA-6...
  • Page 77 L 5025 TOROIDAL COIL 0.578uH ERLA225 L0023234 L 5026 TOROIDAL COIL 0.34uH 0.34U T50-6 L0022977 L 5026 TOROIDAL COIL 0.305uH ERLA220 L0023296 L 5027 TOROIDAL COIL 0.25uH 0.25U T50-6 L0022976 L 5027 TOROIDAL COIL 0.21uH ERLA218 L0023298 FT-891 Technical Supplement PA-7...
  • Page 78 CHIP RES. 1/10W RMC1/10T 101J J24205101 R 5067 CHIP RES. RMC1 220JTE J24305220 R 5068 CHIP RES. RMC1 220JTE J24305220 R 5070 CHIP RES. 1/10W RMC1/10T 101J J24205101 R 5071 CHIP RES. 1/10W RMC1/10T 101J J24205101 FT-891 Technical Supplement PA-8...
  • Page 79 T 5004 COIL PWR-WIDE 4D4 RIB16 L0023113 TC5001 TRIMMER CAP. 20pF TZB4R200AA10R00 K91000217 TH5001 THERMISTOR ERTJ0ER103J G9090119 TH5003 THERMISTOR ERTJ0ER103J G9090119 VR5001 POT. 2.2k EVM3VSX50BE3 J51843222 VR5001 POT. 2.2k VG039NCHXTB222 J51846222 VR5002 POT. 2.2k EVM3VSX50BE3 J51843222 FT-891 Technical Supplement PA-9...
  • Page 80 YAESU P/N VERS. LOT SIDE LAY ADR VR5002 POT. 2.2k VG039NCHXTB222 J51846222 VR5003 POT. 2.2k EVM3VSX50BE3 J51843222 VR5003 POT. 2.2k VG039NCHXTB222 J51846222 VR5004 POT. 2.2k EVM3VSX50BE3 J51843222 VR5004 POT. 2.2k VG039NCHXTB222 J51846222 SHIELD CASE (19x25) RA6068800 FT-891 Technical Supplement PA-10...
  • Page 81 DSP Unit (Lot. 1 - 10) Circuit Diagram FT-891 Technical Supplement DSP-1...
  • Page 82 DSP Unit (Lot. 1 - 10) Parts Layout side A side B FT-891 Technical Supplement DSP-2...
  • Page 83 DSP Unit (Lot. 11 - ) Circuit Diagram FT-891 Technical Supplement DSP-3...
  • Page 84 DSP Unit (Lot. 11 - ) Parts Layout side A side B FT-891 Technical Supplement DSP-4...

  • Page 85: Dsp Unit

    C 6060 CHIP CAP. 0.01uF GRM155B11E103KA01D K22148834 C 6061 CHIP CAP. 10uF GRM188R61E106MA73D K22144818 C 6061 CHIP CAP. 10uF GRM188B31A106ME69D K22104810 C 6062 CHIP CAP. 0.47uF 6.3V GRM155B30J474KE18D K22088802 C 6063 CHIP CAP. 0.47uF 6.3V GRM155B30J474KE18D K22088802 FT-891 Technical Supplement DSP-3...
  • Page 86 L9190133 FB6011 FERRITE BEADS BLM15BD102SN1D L9190133 FB6012 FERRITE BEADS BLM15BD102SN1D L9190133 FB6013 FERRITE BEADS BLM15BD102SN1D L9190133 FB6014 FERRITE BEADS BLM15BD102SN1D L9190133 FB6015 FERRITE BEADS BLM15BD102SN1D L9190133 FB6016 FERRITE BEADS BLM15BD102SN1D L9190133 FB6017 FERRITE BEADS BLM15AG121SN1D L1690843 FT-891 Technical Supplement DSP-4...
  • Page 87 RMC1/16S 470JTH J24189009 R 6054 CHIP RES. 1/16W RMC1/16S 103JTH J24189037 R 6055 CHIP RES. 180k 1/16W RMC1/16S 184JTH J24189052 R 6056 CHIP RES. 180k 1/16W RMC1/16S 184JTH J24189052 R 6057 CHIP RES. 1/16W RMC1/16S 103JTH J24189037 FT-891 Technical Supplement DSP-5...
  • Page 88 1/16W RMC1/16S JPTH J24189070 R 6129 CHIP RES. 1/16W RMC1/16S JPTH J24189070 R 6130 CHIP RES. 1/16W RMC1/16S 330JTH J24189007 X 6001 SPXO 18.432MHz DSO221SWAH 18.432MHZ H0103452 SHIELD CASE COVER (DSP) RA6078700 SHIELD CASE (33x41) RA6078900 FT-891 Technical Supplement DSP-6...

  • Page 89: Panel Unit

    PANEL Unit Circuit Diagram FT-891 Technical Supplement PANEL-1...
  • Page 90 PANEL Unit Parts Layout side A side B FT-891 Technical Supplement PANEL-2...
  • Page 91 K22178236 C 7072 CHIP CAP. 100pF GRM1552C1H101JA01D K22178236 C 7073 CHIP CAP. 100pF GRM1552C1H101JA01D K22178236 C 7074 CHIP CAP. 100pF GRM1552C1H101JA01D K22178236 C 7075 CHIP CAP. 100pF GRM1552C1H101JA01D K22178236 C 7076 CHIP CAP. 100pF GRM1552C1H101JA01D K22178236 FT-891 Technical Supplement PANEL-3...
  • Page 92 1/16W RMC1/16S 473JTH J24189045 R 7009 CHIP RES. 1/16W RMC1/16S 473JTH J24189045 R 7010 CHIP RES. 1/16W RMC1/16S 473JTH J24189045 R 7011 CHIP RES. 1/16W RMC1/16S 103JTH J24189037 R 7012 CHIP RES. 1/16W RMC1/16S 103JTH J24189037 FT-891 Technical Supplement PANEL-4...
  • Page 93 CHIP RES. 1/16W RMC1/16S 470JTH J24189009 R 7093 CHIP RES. 1/10W RMC1/10T 560J J24205560 R 7094 CHIP RES. 1/10W RMC1/10T 560J J24205560 RB7001 BLOCK RES. RAC104D332JCTH J42900041 RB7002 BLOCK RES. MNR04M0ABJ102 J42900039 RB7003 BLOCK RES. MNR04M0ABJ102 J42900039 FT-891 Technical Supplement PANEL-5...
  • Page 94 J42900039 RB7006 BLOCK RES. MNR04M0ABJ102 J42900039 RB7008 BLOCK RES. MNR04M0ABJ102 J42900039 RB7009 BLOCK RES. MNR04M0ABJ102 J42900039 S 7001 ROTARY ENCODER EC09E1524405 Q9000909 S 7002 SLIDE SWITCH SSSS912500 N6090115 X 7001 XTAL DSX321G 11.1MHz DSX321G 11.100MHZ H0103446 FT-891 Technical Supplement PANEL-6...
  • Page 95 CHIP RES. 1/16W RMC1/16 271JATP J24185271 S 8001 TACTILE SWITCH EVQPLHA15 N5090174 S 8002 TACTILE SWITCH EVQPLHA15 N5090174 S 8003 TACTILE SWITCH EVQPLHA15 N5090174 S 8004 TACTILE SWITCH EVQPLHA15 N5090174 S 8005 TACTILE SWITCH EVQPLHA15 N5090174 FT-891 Technical Supplement SW-A-1...
  • Page 96 SW-B Unit Circuit Diagram Parts Layout FT-891 Technical Supplement SW-B-1...
  • Page 97 S 8103 TACTILE SWITCH EVQPLHA15 N5090174 S 8104 TACTILE SWITCH EVQPLHA15 N5090174 S 8105 TACTILE SWITCH EVQPLHA15 N5090174 S 8106 TACTILE SWITCH EVQPLHA15 N5090174 S 8107 TACTILE SWITCH EVQPLHA15 N5090174 S 8108 TACTILE SWITCH EVQPLHA15 N5090174 FT-891 Technical Supplement SW-B-2...
  • Page 98 VR Unit Circuit Diagram Parts Layout Parts List DESCRIPTION VALUE TOL. MFR'S DESIG YAESU P/N VERS. LOT SIDE LAY ADR PCB with Components CD0240001 S 8301 ROTARY ENCODER TP70D00E20 22F B103 Q9001016 FT-891 Technical Supplement VR-1...
  • Page 99 Copyright 2017 YAESU MUSEN CO., LTD. All rights reserved. No portion of this manual may be reproduced without the permission of YAESU MUSEN CO., LTD. YAESU MUSEN CO., LTD. Tennozu Parkside Building 2-5-8 Higashi-Shinagawa, Shinagawa-ku, Tokyo 140-0002 Japan YAESU USA 6125 Phyllis Drive, Cypress, CA 90630, U.S.A.

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