Synth-DIY Yahoo! Groups Archives

Thread

EMAX II Power Supply?

2001-11-15 by Ray

Hi

I'm having a bit of a problem with my EMAX II rack.  When I go to turn 
it on sometimes it powers up just fine and other times it just makes a 
clicking sound with all LEDs blinking as well as the LCD blinking.  
It's very intermittent.  When it eventually powers up it stays on no 
problem. I can even turn it back off and it will turn on again.  It 
almost seems like it acts up after it sits for a long period being off.  
However, sometimes it works just fine for weeks.  I'm very confused.  
Has anyone ever encountered something like this? The clicking is coming 
from the power supply board.  

Thanks
Ray

Re: [emax] EMAX II Power Supply?

2001-11-15 by Gordon JC Pearce

Switch off.  Leave it overnight - The PSU capacitors can be nasty!
Check that all the plugs onto the PSU and main board are secure by
unplugging and refitting them.
If that doesn't cure it, there may be a couple of dry joints on the board -
remove it and resolder any dodgy-looking joints.
As usual, be extremely careful doing this - there can be up to 350vdc on the
input stage.

If all else fails, it's time to invent a new PSU...

HTH
 Gordon.
----- Original Message -----

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From: "Ray" <raymattr@...>
To: <emax@yahoogroups.com>
Sent: Thursday, November 15, 2001 3:37 PM
Subject: [emax] EMAX II Power Supply?


> Hi
>
> I'm having a bit of a problem with my EMAX II rack.  When I go to turn
> it on sometimes it powers up just fine and other times it just makes a
> clicking sound with all LEDs blinking as well as the LCD blinking.
> It's very intermittent.  When it eventually powers up it stays on no
> problem. I can even turn it back off and it will turn on again.  It
> almost seems like it acts up after it sits for a long period being off.
> However, sometimes it works just fine for weeks.  I'm very confused.
> Has anyone ever encountered something like this? The clicking is coming
> from the power supply board.
>
> Thanks
> Ray
>
>
>
>
> Emax and Emax II User's Group
>
> http://www.silveriafamily.com
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>

Re: [emax] EMAX II Power Supply?

2001-11-20 by julian

been meaning to reply to this for a while...

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From: "Ray" <raymattr@...>

> I'm having a bit of a problem with my EMAX II rack.  When I go to turn
> it on sometimes it powers up just fine and other times it just makes a
> clicking sound

like, for instance the spark sound a gas oven makes when you start it?

> with all LEDs blinking as well as the LCD blinking.
> It's very intermittent.  When it eventually powers up it stays on no
> problem. I can even turn it back off and it will turn on again.

switchmode power supply problem.... perhaps you have a dry joint in there,
as gordon suggested, or maybe insulation around a coil has started to break
down.

anyway - fix it soon. all this unregulated voltage driving your emax can't
be good for it!!!!



julian


This ink is white.
This room is filled of bugs.
This girl have a beauty edge.
It is a noise which to cleave the head.
- English as She is Spoke




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Re: [emax] EMAX II Power Supply?

2001-11-20 by raymattr@...

Hi

Thanks for the suggestions!  However, I am brain-dead when it comes to 
electronics.  I know what a dry joint is but not pertaining to electronics!  
Also, insulation around a coil?  How do I check for these things and/or fix 
them?  I have replaced a floppy drive and also installed the memory upgrade 
with no problems but that is the extent of my experience.  Are these things 
that I might be able to do myself?

Thanks again
Ray