Yahoo Groups archive

Emax

Index last updated: 2026-04-28 23:23 UTC

Message

Re: high whine in power supply

2009-02-27 by jammie.emma

--- In emax@yahoogroups.com, sm papke <mothrecords@...> wrote:
>
> THE HIGH WINE IS COMING FROM THE HI VOLTAGE AC CONVERTER WHEN THE
LCD BACK LIGHT GETS WEEK THE back light is like a capacitor they get
week over time this produces a tone of about 10khz to 20khz very
annoying just replace the back light the german company e-foil make
various el strips for different lcds the one for the emax 1 and 2 

they cost 16 euros

you can add a high frequency noise suppressor cap between the positive
and earth on the el connections as a back up 

to replace all the caps is going to cost about £20

some of the transistors and ic chips on the psu are no longer made 

and cost the earth very expensive to get hold of some and minimum
order is 10

i found a brand new replacement switching psu it senses the voltage
and works to that voltage

its regulated supplies and they come with 3 year manufacturers
warranty they sit in exactly the same place as old psu and cost £55 

  
> It sounds like a possible buggy power transformer.. have you had any
problems ie: jumbled screen letters, jittery lights, or any red led's
stuck "on" from time to time? I would definitely try a re-cap on the
PSU first and go from there. I believe there was also someone here in
the group that knows where to get new replacement PSU's that will work
w/ EMAX1 and EMAXII.
> cheers, emulator_island
> 
> --- On Tue, 2/24/09, nung242 <nung242@...> wrote:
> 
> > From: nung242 <nung242@...>
> > Subject: Re: [emax] high whine in power supply
> > To: emax@yahoogroups.com
> > Date: Tuesday, February 24, 2009, 8:35 PM
> > 
> > 
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> >     
> >             Its coming directly from the PSU. 
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> > 
> > Jason V
> > 
> > 
> > 
> > --- On Tue, 2/24/09, sm papke <mothrecords@
> > yahoo.com> wrote:
> > 
> > From: sm papke <mothrecords@
> > yahoo.com>
> > 
> > Subject: Re: [emax] high whine in power supply
> > 
> > To: emax@yahoogroups.
> > com
> > 
> > Date: Tuesday, February 24, 2009, 4:19 PM
> > 
> > 
> > 
> > the whining sounds is audible directly from the PSU, or
> > only when the units outputs are in use? I would definitely
> > re-cap the PSU if it is still stock.
> > 
> > 
> > 
> > cheers, emulator_island
> > 
> > 
> > 
> > --- On Tue, 2/24/09, nung242 <nung242@yahoo. com>
> > wrote:
> > 
> > 
> > 
> > > From: nung242 <nung242@yahoo. com>
> > 
> > 
> > 
> > > Subject: Re: [emax] high whine in power supply
> > 
> > 
> > 
> > > To: emax@yahoogroups. com
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> > 
> > > Date: Tuesday, February 24, 2009, 12:31 PM
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> > >     
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> > >             It has the kit inside for the HD, but I
> > do
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> > > not have one hooked up yet. The only thing I have done
> > is
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> > > take and old internal 3.5 floppy drive and replace the
> > one
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> > > that was originaly there, but it was whining before I
> > did
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> > > that.
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> > > Thanks!
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> > > Jason V
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> > > --- On Tue, 2/24/09, sm papke <mothrecords@
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> > > yahoo.com> wrote:
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> > > From: sm papke <mothrecords@
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> > > yahoo.com>
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> > > Subject: Re: [emax] high whine in power supply
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> > > To: emax@yahoogroups.
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> > > com
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> > > Date: Tuesday, February 24, 2009, 10:23 AM
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> > > hi, is there an HD installed on your EMAX II?
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> > > emulator_island
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> > > --- On Tue, 2/24/09, nung242 <nung242@yahoo.
> > com>
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> > > wrote:
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> > > > From: nung242 <nung242@yahoo. com>
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> > > > Subject: [emax] high whine in power supply
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> > > > To: emax@yahoogroups. com
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> > > > Date: Tuesday, February 24, 2009, 10:18 AM
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> > > >             Hello, 
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> > > >  When I turn on my emax II keyboard - the power
> > 
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> > > supply
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> > > > whines loudly for about 5 minutes before
> > quieting
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> > > down. Does
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> > > > this mean the power supply is on the way out? If
> > so,
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> > > where
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> > > > would I get a new one? Would it be cheaper to
> > have the
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> > > power
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> > > > supply repaired?
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> > > > Thanks for any help or suggestions!
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> > > > Jason V
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> > > >  http://www.youtube.
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Attachments

Move to quarantaine

This moves the raw source file on disk only. The archive index is not changed automatically, so you still need to run a manual refresh afterward.