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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/ZHDZSLVTZ4HOENM47VOOY6OORJHH2DMB/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "CAJUhCTPyZB+rQhsvbthexgUnMBt=zD+TL6wucKWfpsz_TBYwqw@mail.gmail.com",
    "message_id_hash": "ZHDZSLVTZ4HOENM47VOOY6OORJHH2DMB",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/FVOEY4OO2HY3SH2AJCPW5OYM2Y5N47AS/",
    "sender": {
        "address": "normanlizeth (a) gmail.com",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Norm n3ykf",
    "subject": "Re: [amsat-bb] Elevation meter Rotor YAESU G-5500 stopped working",
    "date": "2017-07-18T23:47:41Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/FVOEY4OO2HY3SH2AJCPW5OYM2Y5N47AS/",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/DTLSCEY4ZTST5L2QPOFC5NSYIYBUD6CI/"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Albert,\n\nTake EXTREME CARE working on equipment that has power applied.\n\nYou'll need a copy of the schematic. Preferably the one that came with\nthe controller/rotator. There are at least two different power op-amp\npower supply layouts. One with a pass transistor and zener diodes, the\nother a 75L10 regulator.\n\nUnplug the control box.\n\nRemove the top cover. Remove the front two screws from the bottom\ncover. This will let the face (meters, circuit board and switches)\nfree. (still wired to the rest)\n\nGet two books. Turn the front face down on top of the books, switches\nbetween the books. (to allow the assembly to sit level and not\npress/break the switches)\n\n\nMAKE SURE THE UNIT IS UNPLUGGED!!!!!!!!!!!!!!!!!\n\n\nQ4 is one half of a 4558 op amp pair(two on one chip, the other runs\nAZ output for the aux jack).\n\nFind Q4.\n\nYou're mission is to check the various components making up the drive\ncircuit for the EL meter for trouble.\n\nCould be:\n\nShorted capacitor\n\nOpen diode\n\nShort or open via other means.\n\nMAKE SURE THIS IS UNPLUGGED!!!!!!!!!!!!!!!!!\n\nUse an Ohmmeter to look for capacitors that aren't open (Should look\nclose to it, at least the values in the circut. Electrolytics are a\ndifferent story...) Look for open diodes. Meter anything reasonably\naccessable, starting from the wiper on VR2 on the back panel. Some\nthings are best looked at with respect to ground, others point to\npoint reading the components in between.\n\nDANGER!!! DANGER!!!! DANGER!!!\n\nThis part of the test requires making power on voltage measurements.\nHere be dragons, or a trip to your eternal reward!!!\n\n Locate L2 and L4. Those components (each in their seperate circuit)\nform the power supplies (rails) for the EL op amp. See C1 (the voltage\noutput) next to L2? C2 likewise next to L4?\n\nCheck the pins 8(C1) with respect to ground and 4(C2) of Q4. These are\nthe power supply rails (should be +/- 12 volts or so).\n\nBefore plugging it in to test, make sure no bare wires are touching\nthings they should not be.\n\nPlug it in (you did leave the power switch on, didn't you??). Test\naway. UNPLUG IT AS SOON AS YOU'RE DONE!!!!\n\nHave fun and don't break anything. A fire here is a failure.\n\nNorm n3ykf\n\nOn Tue, Jul 18, 2017 at 5:56 PM, Albert van Deursen <[email protected]> wrote:\n> Hi all,\n>\n>\n>\n> All of a sudden the elevation meter stopped working of my Yaesu G-5500 rotor\n> controller unit .\n>\n> No issue with the AZ meter. Rotor itself keeps on steering / working\n> without any problem in EL &AZ (via interface EA4TX ARS-USB) so all still\n> working fine (fortunately !)  for satellite work.\n>\n> Looks like a component failure in the controller unit  or the meter itself ?\n>\n>\n>\n>\n> A physical check (opening the controller unit) didn't show any anomaly.\n> Being a not too tech ham was wondering if any of you Yaesu rotor users had\n> seen this problem before / around ?\n>\n>\n>\n> Possibly anyone to hint/ indicate at a quick check in the schematic wire\n> diagram to where to start looking for this failure ?\n>\n>\n>\n>\n>\n> Thanks beforehand for yr appreciated advice\n>\n> 73\n>\n> Albert\n>\n> PD0OXW\n>\n>\n>\n> _______________________________________________\n> Sent via [email protected]. AMSAT-NA makes this open forum available\n> to all interested persons worldwide without requiring membership. Opinions expressed\n> are solely those of the author, and do not reflect the official views of AMSAT-NA.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb\n",
    "attachments": []
}