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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/DTLSCEY4ZTST5L2QPOFC5NSYIYBUD6CI/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "DTLSCEY4ZTST5L2QPOFC5NSYIYBUD6CI",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/FVOEY4OO2HY3SH2AJCPW5OYM2Y5N47AS/?format=api",
    "sender": {
        "address": "robert (a) k3rrr.com",
        "mailman_id": "4c878317ca874f668e48214c6598131f",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/4c878317ca874f668e48214c6598131f/emails/?format=api"
    },
    "sender_name": "Robert",
    "subject": "Re: [amsat-bb] Elevation meter Rotor YAESU G-5500 stopped working",
    "date": "2017-07-19T16:40:52Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/ZHDZSLVTZ4HOENM47VOOY6OORJHH2DMB/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/G6DGDASL6GGMDNPUQGVAJVZOSBK6SKUQ/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Albert,\n\nI had the same kind of failure...in my case it was the LM/MC 7806C \nvoltage regulator. At Mouser in the USA, it is a $0.62 part.\n\nhttps://www.fairchildsemi.com/datasheets/LM/LM7806.pdf\n\nYour problem may be something different...but wanted to give you one \nmore place to investigate.\n\n73 de Robert K3RRR\n\n------\n\n73 de Robert K3RRR\nK3RRR.com\n@K3TripleR\nYouTube.com/user/K3RRR\n\nOn 7/18/2017 7:47 PM, Norm n3ykf wrote:\n> Albert,\n>\n> Take EXTREME CARE working on equipment that has power applied.\n>\n> You'll need a copy of the schematic. Preferably the one that came with\n> the controller/rotator. There are at least two different power op-amp\n> power supply layouts. One with a pass transistor and zener diodes, the\n> other a 75L10 regulator.\n>\n> Unplug the control box.\n>\n> Remove the top cover. Remove the front two screws from the bottom\n> cover. This will let the face (meters, circuit board and switches)\n> free. (still wired to the rest)\n>\n> Get two books. Turn the front face down on top of the books, switches\n> between the books. (to allow the assembly to sit level and not\n> press/break the switches)\n>\n>\n> MAKE SURE THE UNIT IS UNPLUGGED!!!!!!!!!!!!!!!!!\n>\n>\n> Q4 is one half of a 4558 op amp pair(two on one chip, the other runs\n> AZ output for the aux jack).\n>\n> Find Q4.\n>\n> You're mission is to check the various components making up the drive\n> circuit for the EL meter for trouble.\n>\n> Could be:\n>\n> Shorted capacitor\n>\n> Open diode\n>\n> Short or open via other means.\n>\n> MAKE SURE THIS IS UNPLUGGED!!!!!!!!!!!!!!!!!\n>\n> Use an Ohmmeter to look for capacitors that aren't open (Should look\n> close to it, at least the values in the circut. Electrolytics are a\n> different story...) Look for open diodes. Meter anything reasonably\n> accessable, starting from the wiper on VR2 on the back panel. Some\n> things are best looked at with respect to ground, others point to\n> point reading the components in between.\n>\n> DANGER!!! DANGER!!!! DANGER!!!\n>\n> This part of the test requires making power on voltage measurements.\n> Here be dragons, or a trip to your eternal reward!!!\n>\n>   Locate L2 and L4. Those components (each in their seperate circuit)\n> form the power supplies (rails) for the EL op amp. See C1 (the voltage\n> output) next to L2? C2 likewise next to L4?\n>\n> Check the pins 8(C1) with respect to ground and 4(C2) of Q4. These are\n> the power supply rails (should be +/- 12 volts or so).\n>\n> Before plugging it in to test, make sure no bare wires are touching\n> things they should not be.\n>\n> Plug it in (you did leave the power switch on, didn't you??). Test\n> away. UNPLUG IT AS SOON AS YOU'RE DONE!!!!\n>\n> Have fun and don't break anything. A fire here is a failure.\n>\n> Norm n3ykf\n>\n> On 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\n",
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