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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/3T7VYFSV6XOK3ULM72CS2JGFTYZRBDLA/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "3T7VYFSV6XOK3ULM72CS2JGFTYZRBDLA",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/3T7VYFSV6XOK3ULM72CS2JGFTYZRBDLA/",
    "sender": {
        "address": "jkopala (a) gmail.com",
        "mailman_id": "083d74d034614b08876fb7affa0a2348",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/083d74d034614b08876fb7affa0a2348/emails/"
    },
    "sender_name": "John Kopala",
    "subject": "[amsat-bb] Re: Yaesu 5500 Rotor Problem",
    "date": "2011-07-21T03:56:02Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Jeff, KB2M,\n\nI am sending the schematic for the G-5500 separately.\n\nDisconnect Azimuth and Elevation wires 1, 2, and 3 from the Control box.\nCheck the resistance across the 1 and 3 leads.  It should be 500 ohms.\nCheck the resistance across the 1 and 2 leads.\nIt should be between 0 and 500 ohms and should change as the rotors are turned.\nIf these tests pass, the problem is in the control box.  If not, the problem is the pots in the rotors.\n\nIf the pots are OK, the problem is somewhat more complicated.\nLooking at the schematic, there are separate circuits for the meters and for the feedback level\nto your automatic control.  If the IC's failed, the ones involved are Q3 and Q4 which are 4558s.\nSince these are dual circuit ICs, that would mean 4 failures at the same time.  Not likely, but possible.\n\nMore likely the problem is either in the Q1 power supply circuit which provides the power for Q3 and Q4\nor the Q2 regulator, a 7806, which provides the voltage to the pots.  A failure in these circuits would\nkill the meter readouts and the voltage feedback to the automatic control.\n\nJohn Kopala\nN7JK\n> Date: Tue, 19 Jul 2011 16:54:10 -0400\n> From: \"Jeff KB2M\"<[email protected]>\n> Subject: [amsat-bb]  Yaesu 5500 rotor problem\n> To:<[email protected]>\n> Message-ID:<003b01cc4656$05d2e1e0$1178a5a0$@net>\n> Content-Type: text/plain;\tcharset=\"us-ascii\"\n>\n>   I'm having a problem with my 5500 after a thunderstorm. What is happening\n> is that the rotor works manually, but doesn't display az and el information\n> on the control box. Also when I try to use computer control it goes all the\n> way to stop in both azimuth and elevation. I'm thinking this might be in the\n> control box, as both az and el are doing the same thing, the control box\n> being the single point of failure. Did anyone ever have this problem? How\n> can I diagnosis what chip might be at fault without a schematic. I vaguely\n> remember having this same problem after a close  lightning strike with my\n> prior az el Yaesu box about 14 years ago but don't remember what chip I\n> swapped out, or how I determined which one was at fault. This getting old\n> thing really sucks. Any help would be appreciated.\n>\n> 73 Jeff kb2m\n",
    "attachments": []
}