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GET /hyperkitty/api/list/[email protected]/email/RFD5FNBH3G6K2XVCDILGZ2DX7ZXPX5AC/
{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/RFD5FNBH3G6K2XVCDILGZ2DX7ZXPX5AC/", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/", "message_id": "CAJUhCTMBZkd=HQENmnZN1QNKGMC2YR+ifm4avws8o6cwZ1c3Gg@mail.gmail.com", "message_id_hash": "RFD5FNBH3G6K2XVCDILGZ2DX7ZXPX5AC", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/RFD5FNBH3G6K2XVCDILGZ2DX7ZXPX5AC/", "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": "2017-07-19T00:04:01Z", "parent": null, "children": [], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "If the box is driving the tracker (that's what he says), it's not\nexternal. Time to get the screwdriver.\n\n\n\n\n\nOn Tue, Jul 18, 2017 at 8:01 PM, W3AB/GEO <[email protected]> wrote:\n> Norm,\n>\n> He should make sure it is not an external issue before he dives into the\n> internal circuitry.\n>\n> He should also check that the controller is operating before opening the\n> controller.\n>\n> Albert, take a VOM, set it on AC and the 50V range if it isn't autoranging.\n> Turn on the controller. Put 1 lead on pin 6 of the terminal strip, the other\n> lead on pin 4 and operate the up/down switch. Do the same for pin 5. If the\n> controller is operating correctly you should measure ~30V. If not, you have\n> an internal failure and follow Norm's advice.\n> ___\n> Sent from my two way wrist watch\n> 73 de W3AB/GEO\n>\n> On Jul 18, 2017, 16:50, at 16:50, Norm n3ykf <[email protected]> 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]>\n>>wrote:\n>>> Hi all,\n>>>\n>>>\n>>>\n>>> All of a sudden the elevation meter stopped working of my Yaesu\n>>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\n>>still\n>>> working fine (fortunately !) for satellite work.\n>>>\n>>> Looks like a component failure in the controller unit or the meter\n>>itself ?\n>>>\n>>>\n>>>\n>>>\n>>> A physical check (opening the controller unit) didn't show any\n>>anomaly.\n>>> Being a not too tech ham was wondering if any of you Yaesu rotor\n>>users had\n>>> seen this problem before / around ?\n>>>\n>>>\n>>>\n>>> Possibly anyone to hint/ indicate at a quick check in the schematic\n>>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.\n>>Opinions expressed\n>>> are solely those of the author, and do not reflect the official views\n>>of AMSAT-NA.\n>>> Not an AMSAT-NA member? Join now to support the amateur satellite\n>>program!\n>>> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb\n>>_______________________________________________\n>>Sent via [email protected]. AMSAT-NA makes this open forum available\n>>to all interested persons worldwide without requiring membership.\n>>Opinions expressed\n>>are solely those of the author, and do not reflect the official views\n>>of AMSAT-NA.\n>>Not an AMSAT-NA member? Join now to support the amateur satellite\n>>program!\n>>Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb\n", "attachments": [] }