Yaesu Ft-901DM dial and meter lights, how to access them?

Discussion in '"Boat Anchor" & Classic Equipment' started by W6VHK, Dec 12, 2017.

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  1. W6VHK

    W6VHK Ham Member QRZ Page

    Just picked up a nice clean FT-901DM and both the dial and meter lights are out. Can anyone tell me the easiest way to access them?

    Darrell / W6VHK
  2. W9GB

    W9GB Ham Member QRZ Page

    Yaesu FT-901DM HF Transceiver
    http://foxtango.org/FT901/FT-901-902 Web Page.htm

    Yaesu FT-901 Service Manual

    Yaesu FT-901 / FT-902 Survival Guide
    http://foxtango.org/Files/FT901-902 SG5.pdf

    Yaesu made an design improvement after the FT-101 series and installed two axial lead lamps in front of the meter, so there is no need to remove the meter movement to replace these incandescent lamps.
    Lamp, Meter S8100017
    Suitable substitute - PN 620701 from Farnell.com $3.12
    OBS-NLA 032704

    Newark (USA) and Farnell (UK) are part of element14 Group.
    LAMP, T3.8 AXIAL W/E 8V 0.6W; Lamp fitting type:
    Axial wire ended, T3.8; Power rating:0.6W; Current rating:0.1A;
    Length / Height, external:20mm; Length, lead:15mm;
    Light output, total:1.9lm; Typical operating life:5000h; Vo
    Last edited: Dec 12, 2017
  3. W6VHK

    W6VHK Ham Member QRZ Page

    I have read that several times and can find no mention, Am I missing something?
  4. W9GB

    W9GB Ham Member QRZ Page

    Section 3 : Proper Disassembly of Front Panel.

    Section 4 : Parts List
    Page 4-6 : Pilot Lamp (Incandescent Lamps)
    Schematic notation : Yaesu Part number : OEM Supplier number : Specifications

    PL1 : 14000027 : BF 311-04071A, 14 V 0.12 A (120 mA)
    PL2 : 14000028 : BF 311-03011A, 8 V 0.15 A (150 mA)
    PL3 and PL4 (Meter, M1) : S8100017 : ??, 8 V 0.055 A (55 mA)
    Axial bulbs (PL3, PL4) were popular part in 1970s stereo equipment

    CONTACT Yaesu USA Parts FIRST !!
    W5INC (2014): Yaesu still offered the dial lights for sale at about $1.25 a piece.
    So I ordered up the dial lights and got a few extra as spares. Yaesu part # Q1000040.
    Yaesu still offered up the FT-101s, of all varieties,
    dial, S meter and back panel RF board fuse 16 V @ .15 milli amp light bulbs also.

    CML (now VCC) large supplier of incandescent lamps
    Mouser and Newark/ Farnell are 2 distributors.

    Chicago Miniature Lighting (CML) PN: 3820AL-LF

    JKL Lamps (Pacoima, California)
    Last edited: Dec 12, 2017
  5. W6VHK

    W6VHK Ham Member QRZ Page

  6. W9GB

    W9GB Ham Member QRZ Page

    TOSHIBA LIGHTING was the OEM supplier to Yaesu, for the Meter Lamps (PL3 and PL4)
    Toshiba manufactures two (2) incandescent bulbs at 8 volts.
    One draws 55 mA (no part # reference) and the Other a brighter, longer life at 150 mA: HRT-3270A
    TOSHIBA Industrial Catalog Page : Axial Incandescent Lamps

    In the United States,
    Marketing and sales of automotive light sources, components for various OA applications

    Harison Toshiba Lighting (U.S.A.) Inc.
    28345 Beck Road, Suite 407
    Wixom MI 48393
    Full Catalog of Miniature Lamps from Toshiba Lighting

    Color Filters (Silicon Rubber Caps)
    Last edited: Dec 12, 2017
  7. W6VHK

    W6VHK Ham Member QRZ Page

    Better to remove the front panel or remove just the VFO ? .....does the meter come out from the rear?
  8. W9GB

    W9GB Ham Member QRZ Page


    PAGES 3-1 and 3-2 PICTORIALS

    Page 3-1 : NOTE How many screws must be removed to get Top and Bottom Covers OFF.
    Beginners and Novices routinely loose screws —- use containers or bags.
    Disassembly Procedure: Narrative Instructions (Yaesu Bench Tech) for initial steps.

    Page 3-2 : SEE the Light Assembly (bulb/lamp located) for VFO in Pictorial??
    Assembly shown in empty space of Front Panel (where VFO assembly resides).
    The front panel of this radio is a Layer Cake ... in order to get to the Meter,
    mounted on the metal front ... you have to take off those Plastic Design Pieces (Bling).
    Clearly shown in Pictorial on Page 3-2. Meter mounted to front metal sub-panel.
    BULBS? Already provided a Clear Photo — you need to remove front plastic of meter.

    You have to deal with VFO, to remove plastic front panel !!
    Last edited: Dec 13, 2017
  9. W6VHK

    W6VHK Ham Member QRZ Page

    Got it all apart ... no short cuts on this job ...All knobs, front panel, VFO ,counter, 2 modules, just to replace 3 bulbs.
  10. N8YX

    N8YX Ham Member QRZ Page

    Take the opportunity to clean everything (knobs and panel) plus give the potentiometers a shot of FaderLube or similar cleaner while the front is apart.

    I'm going to do the same procedure to my '901 over the Christmas holidays.

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