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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/LR4VCYNADZEU5JFFKZDWCITH5KALHHG2/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "LR4VCYNADZEU5JFFKZDWCITH5KALHHG2",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/5TP3ZXH645VCYHPO7VBJUHTGVH2WDDQV/",
    "sender": {
        "address": "w9gb (a) icloud.com",
        "mailman_id": "b156075684ac4750b888b2dd14137a40",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/b156075684ac4750b888b2dd14137a40/emails/"
    },
    "sender_name": "Gregory Beat",
    "subject": "Re: [amsat-bb] elev rotor",
    "date": "2017-09-08T20:48:40Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/5TP3ZXH645VCYHPO7VBJUHTGVH2WDDQV/",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Noticed differences in Yaesu G-5500 schematic notation.\nFrom the 1998 version:\nThe 1S1588 diode references should be: D15, D17, D19, and D21\n\nD14, D16, D18, D20 are 1N4002 diodes across the relay coils (RY-x).\n\nw9gb\nSent from iPad Air\n\n> On Sep 8, 2017, at 3:31 PM, Gregory Beat <[email protected]> wrote:\n> \n> Yaesu G-5500 AZ-EL Rotator manual (schematic LAST PAGE)\n> http://www.radiomanual.info/schemi/ACC_rotator/Yaesu_G-5500_user.pdf\n> Look at the Yaesu G-5500 Schematic diagram, to start your Troubleshooting.\n> Parts readily available from Yaesu USA or Electronics Distributors (Digi-Key, Mouser).\n>  \n> UNPLUG Rotator Controller from AC Line Voltage, before Opening Case.\n> Have your bench DVM/VOM for testing Diodes within unit.\n> \n> 1. Failure [open] of the Toshiba 1S1588 diodes (D14, D16, D18, D20, D21) would cause remote control failures -- via DIN 8-pin connector.\n> 2.) The Texas Instruments RC4558, Dual General-Purpose Operational Amplifier, is active component (Q3 and Q4) for Analog Meter operation.  May have damaged a section of that IC.\n> ==\n> Toshiba was OEM supplier to Yaesu.  \n> 1S1588 is a silicon diode, U = 35V, I = 120mA, applications: fast switch\n> \n> EIC 1S1588 Data-sheet, High Speed Switching Diode, DO-35 Glass Case, ~35 V\n> http://www.eicsemi.com/DataSheet/1S1588.PDF\n> \n> Texas Instruments RC4558 Product Page\n> http://www.ti.com/product/RC4558\n> The RC4558 device is a dual general-purpose operational amplifier, with each half electrically similar to the µA741, except that offset null capability is not provided.\n> \n> Appears you had an ESD event.  Lightning strike nearby?\n> http://www.sunsunsun.net/kd4app/amsat/g5500.htm\n> \n> Replacement G-5500 Controller from Yaesu USA Parts: $300.00\n> http://www.yaesu.com/?cmd=contactus\n> \n> greg\n> w9gb\n> ===\n> Date: Fri, 8 Sep 2017 19:14:23 +0000 (UTC)\n> \n> Hello,\n> My Yaesu G-5500 works only manually for Azimuth & Elevation\n> 1.) No meter indication on Elevation. \n> 2.) No computer control using SATPC32 application.\n> \n> Ideas for troubleshooting ? \n> 73 Bob W7LRD \n> --\n",
    "attachments": []
}