K5synth

Hi, its nicccck  , sorry to bother you again, ive already found the 
problem. Its the transformer. The primary is open, so i had 220v on 
the input, but no current was going thru it. I checked continuity, 
and resistance but i couldnt measure any. So i came to the 
conclusion that the primary is open. 
Ive already checked the schematics, but in order to get a new 
transformer i need to know the ac outputs. They arent specified on 
the schematics .
so if anyone is willing to help me ill keep checking my mail.

thanx a lot ,
sorry to bother yyou again really .
bye
nic

There's a board before the transformer. Is there power in the socket the transformer plugs in?

Also, try to check for resistance in the wires from that socket to transformer in. You'll need to remove the tape around it.

Maybe Kawai(Not US one, they don't reply you) could sell you a transformer or tell you the specs of it.



"tuff_gnarl_69" <tuff_gnarl_69@...> wrote:

>Hi, its nicccck  , sorry to bother you again, ive already found the 
>problem. Its the transformer. The primary is open, so i had 220v on 
>the input, but no current was going thru it. I checked continuity, 
>and resistance but i couldnt measure any. So i came to the 
>conclusion that the primary is open. 
>Ive already checked the schematics, but in order to get a new 
>transformer i need to know the ac outputs. They arent specified on 
>the schematics .
>so if anyone is willing to help me ill keep checking my mail.
>
>thanx a lot ,
>sorry to bother yyou again really .
>bye
>nic
>
>


-- 
Antoine Desch\ufffdnes
aka DragonMaster
http://thehotcom.deep-ice.com/
Files:http://angelfire.com/ca7/hotcomcenter/


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Hi Nick,

    I measured the transformer this evening for you whilst replacing 
my backlight :-)

    If you look at the transformer connector that plugs into the PSU 
circuit board, you'll notice the colours of the wires from top to 
bottom is Red, Black, Red, Orange, Orange.

The AC voltage between the first (top) red and the black is 9.96V, 
between the black and bottom most red wire is 10.54V, and across the 
two reds is 19.57V.

Across the two orange wires is 9.6V

On the power supply, the regulators are 7805 which gives +5 at 1A 
maximum, 7806 +6V at 1A maximum, 7906 -6V at 1A maximum and a very 
small regulator like a transistor a 79L15 (-15 at 100ma).

Each regulator needs about 3V headroom to work correctly. So you may 
have a choice with the transformers. Please check the windings on the 
secondary thoroughly, but I think it is (red-black-red 10-0-10) and 
(orange-orange 0-10). I hope - check it please! If you run from too 
high an AC voltage the regulators may get hot and the heatsink isn't 
really up to much abuse...

The only problem is the original 'low profile' transformer - you 
might get something similar, or perhaps a toroidal one????? ;-)


Back to the backlight. Mine came from backlights.co.uk, and they did 
an excellent job, it arrived very fast, and the contacts were not far 
off the original. I don't intend to advertise, but the lights are 
nice :-) The bit about undoing the aluminium clip isn't really 
necessary, They slide in nicely. Quick repair, nice result, enough 
said!

Cheers, Nick

Adam


--- In k5synth@yahoogroups.com, "tuff_gnarl_69" <tuff_gnarl_69@y...> 
wrote:

> Hi, its nicccck  , sorry to bother you again, ive already found the 
> problem. Its the transformer. The primary is open, so i had 220v on 
> the input, but no current was going thru it. I checked continuity, 
> and resistance but i couldnt measure any. So i came to the 
> conclusion that the primary is open. 
> Ive already checked the schematics, but in order to get a new 
> transformer i need to know the ac outputs. They arent specified on 
> the schematics .
> so if anyone is willing to help me ill keep checking my mail.
> 
> thanx a lot ,
> sorry to bother yyou again really .
> bye
> nic

Here's what I got:

In order (V)
              01 02 03 04 05
  Wires       R1 BK R2 O1 O2
1.red(1)      -- 12 24 20 10
2.black       12 -- 12 10 00
3.red(2)      24 12 -- 00 10
4.orange(1)   20 10 00 -- 12
5.orange(2)   10 00 10 12 --

              00001 00002 00003 00004 00005
  Wires       RED 1 BLACK RED 2 ORNG1 ORNG2
1.red(1)      ----- 11.80 23.6  19.16  9.56
2.black       11.80 ----- 11.80  9.76  0.28
3.red(2)      23.6  11.80 -----  0.16  9.55    
4.orange(1)   19.16  9.76  0.16 ----- 11.79
5.orange(2)    9.56  0.28  9.55 11.79 -----



g0ory@... a \ufffdcrit:

> Hi Nick,
>
>     I measured the transformer this evening for you whilst replacing
> my backlight :-)
>
>     If you look at the transformer connector that plugs into the PSU
> circuit board, you'll notice the colours of the wires from top to
> bottom is Red, Black, Red, Orange, Orange.
>
> The AC voltage between the first (top) red and the black is 9.96V,
> between the black and bottom most red wire is 10.54V, and across the
> two reds is 19.57V.
>
> Across the two orange wires is 9.6V
>
> On the power supply, the regulators are 7805 which gives +5 at 1A
> maximum, 7806 +6V at 1A maximum, 7906 -6V at 1A maximum and a very
> small regulator like a transistor a 79L15 (-15 at 100ma).
>
> Each regulator needs about 3V headroom to work correctly. So you may
> have a choice with the transformers. Please check the windings on the
> secondary thoroughly, but I think it is (red-black-red 10-0-10) and
> (orange-orange 0-10). I hope - check it please! If you run from too
> high an AC voltage the regulators may get hot and the heatsink isn't
> really up to much abuse...
>
> The only problem is the original 'low profile' transformer - you
> might get something similar, or perhaps a toroidal one????? ;-)
>
>
> Back to the backlight. Mine came from backlights.co.uk, and they did
> an excellent job, it arrived very fast, and the contacts were not far
> off the original. I don't intend to advertise, but the lights are
> nice :-) The bit about undoing the aluminium clip isn't really
> necessary, They slide in nicely. Quick repair, nice result, enough
> said!
>
> Cheers, Nick
>
> Adam
>
>
> --- In k5synth@yahoogroups.com, "tuff_gnarl_69" <tuff_gnarl_69@y...>
> wrote:
> > Hi, its nicccck  , sorry to bother you again, ive already found the
> > problem. Its the transformer. The primary is open, so i had 220v on
> > the input, but no current was going thru it. I checked continuity,
> > and resistance but i couldnt measure any. So i came to the
> > conclusion that the primary is open.
> > Ive already checked the schematics, but in order to get a new
> > transformer i need to know the ac outputs. They arent specified on
> > the schematics .
> > so if anyone is willing to help me ill keep checking my mail.
> >
> > thanx a lot ,
> > sorry to bother yyou again really .
> > bye
> > nic


-- 
Antoine Desch\ufffdnes /aka
  -\ufffd\ufffd`-\ufffd-DragonMaster-\ufffd-\ufffd\ufffd`-
http://thehotcom.deep-ice.com/