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  1. #1
    Join Date
    Apr 2019
    Location
    Sydney
    Posts
    25

    Default Sony DRO noise common?

    Hi Fellas,

    I have a Sony LG10 DRO on my milling machine, I gather it's a mid 1990's model (two axis DRO). I've only had it a short while (along with the mill) and have hardly used it, but when it's powered up and in use (while the mill is not running) I can hear a high pitched noise coming from the unit, it sounds a bit lower in tone than a mozzie right near your ear

    I took the cover of the unit off and had a look in there but there doesn't appear to be any problems or moving parts causing the noise, so is this noise common? If you have one of these DROs does it make a noise? Any help would be tops

  2. #2
    Join Date
    Jul 2006
    Location
    Athelstone, SA 5076
    Posts
    4,255

    Default

    If its working okay I'd just turn the stereo up louder

  3. #3
    Join Date
    Dec 2010
    Location
    Syd
    Posts
    492

    Default

    One of the Eassons here has buzzed virtually since day 1, going on 10 years now. The lone Sony, doesn't make any noise, but the numbers on the display will zero occasionally for no apparent reason....usually at the last stage of a job, must be getting on to 35 year old that one!

  4. #4
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,439

    Default

    Hi Guys,

    I've repaired a several of those old, 20 years +, DRO units. The electrolytic capacitors dry out with age. The usual suspect ones are in the power supplies and any decoupling capacitors in the display. Changing them usually cures the problem. The capacitance value is very rarely critical, but never fit capacitors with a lower voltage rating.

    One that I did buzzed. That turned out to be the transformer laminations ! The transformer had lost its wax over the years. It was mounted on a vertical panel, and a puddle of wax below it on the bottom of the case gave it away. A dose of hot melt glue sorted that one.

    Another issue with old electronic devices is dried solder joints. I've had displays with one digit out or missing segments that were down to bad solder joints. Sometimes tapping the circuit board with a pencil brought things back to life.

    HTH.
    Best Regards:
    Baron J.

  5. #5
    Join Date
    May 2011
    Location
    Murray Bridge S Aust.
    Age
    71
    Posts
    5,942

    Default

    The experiences of the Members on here is phenominal. I've not seen a question yet that's not been answered in a plausible way.
    Thanks EVERYONE.
    Kryn
    To grow old is mandatory, growing up is optional.

  6. #6
    Join Date
    Apr 2019
    Location
    Sydney
    Posts
    25

    Default

    Thank you Fellas, your replies are most appreciated! I am going to get to use the mill (and therefore the DRO) some more soon, so I'll see how the noise goes and workout what to do from there, turning up the radio or spinning the mill quicker is the cheapest option for sure

  7. #7
    Join Date
    Jun 2012
    Location
    melbourne
    Posts
    341

    Default

    If its a switchmode supply you are probably hearing the switching frequency or some harmonic of it. As BaronJ said, capacitors are possible suspects and inductors. A bit more here
    https://www.eevblog.com/forum/projec...ng-coil-whine/

    Useful idea with the tube but I haven't tried that myself.

    I just bought some of this as I am repairing a TV switchmode supply at the moment and most discrete components are held in place with this stuff
    https://www.ebay.com.au/itm/New-High...frcectupt=true

  8. #8
    Join Date
    Apr 2019
    Location
    Sydney
    Posts
    25

    Default

    Thanks Sossity for information. I've used the tubing method before, so I'll try it again on the DRO.
    Cheers

  9. #9
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,439

    Default

    Hi Guys,

    Be careful with the silicon rubber/bath type ! RTV stuff is very good and doesn’t contain acetic acid (Vinegar) which will attack the components. This is one reason that I prefer to use hot melt glue. Another reason is that its next to impossible to remove cleanly. Where hot glue just melts and runs off with a hot air jet.
    Best Regards:
    Baron J.

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