Re: Tech: Please Help / NSM Firebird Jukebox Volume Issue

On Saturday, August 1, 2009 at 9:34:07 PM UTC-4, angel-care wrote:
> On Aug 1, 6:37 am, McDuseldick <[email protected]> wrote:
> > On 13 Jun., 01:20, postman516 <[email protected]> wrote:
> >
> >
> >
> >
> >
> > > On Jun 12, 7:43 am, KR <[email protected]> wrote:
> >
> > > > On Jun 12, 2:29 pm, postman516 <[email protected]> wrote:
> >
> > > > > Hello, i just bought an NSM Firebird wallbox that had no manual & i am
> > > > > not happy with the volume i am getting from it. I am using Yamaha
> > > > > bookshelf 8 ohm speakers and have the neg hooked to terminal 0 and the
> > > > > pos to terminal 5 on each side of the transformer. I would say the
> > > > > Volume is pretty low and when i try to turn the volume up or down
> > > > > using the volume on the control board it does nothing to help the
> > > > > matter. I also noticed the 3 buttons on the bottom of the box also do
> > > > > not raise or lower the volume. So basically, right now i am stuck with
> > > > > a fixed volume. I tried hooking the wires direct to the amp bypassing
> > > > > the transformer but this also did not help. Do you think i need a new
> > > > > transformer and would this solve my problem? I see some newer boxes
> > > > > have a 7 lug transformer as well. Would that one give me more volume
> > > > > and would it work in my firebird wall box? Sorry about all the
> > > > > questions but i am not sure what the problem is nor what the
> > > > > transformers function truly is? The guy i bought it from knows nothing
> > > > > about the box at all. Thanks for any help regarding this matter! Mike
> > > > > in FL
> >
> > > > The transformers are probably the output transformers for the
> > > > amplifier. The taps represent wattage
> > > > levels, that are used to match speakers (or series/parallel groups of
> > > > speakers) to the amplifier and avoid overloading it. The transformer
> > > > probably generates a 70v / 100v line for 500 ohm PA type speakers too.
> > > > (these will have a transformer on the back of them with wattage taps
> > > > on them.)
> >
> > > > I doubt that the transformer is a problem, the sound would probably be
> > > > distorted / overloaded. In other brands, I have NEVER had an output
> > > > transformer fail on a solid state amp. You can disconnect it from the
> > > > amp and run a speaker direct if you want, just to eliminate it.
> >
> > > > The other possibility is blown output stage, this can result in low
> > > > volumes, but there would be distortion, and probably blown fuses to
> > > > the output transistors.
> >
> > > > I don't know how the volume control system works on these things. If
> > > > it is done with buttons, it either drives a motorised pot, (this
> > > > should be visibly connected to the amplifier / preamp board) or runs
> > > > via the CPU or to the amp, and then to a "volume control" IC on the
> > > > Amplifier Preamp board. it may also run to the amp, and control the
> > > > volume directly via a special IC.
> >
> > > > Either way, something along this chain is broken, you will need a
> > > > schematic or to identify and look up preamp the IC part numbers on the
> > > > web and identify how it all works and deal with it from there.- Hide quoted text -
> >
> > > > - Show quoted text -
> >
> > > I have found a wire harness that was cut and left in the box
> > > that has 4 wires in it brown, blue, green and orange. They connect to
> > > the vol up, vol down & the cancel button at the bottom of the box but
> > > i do not see anyplace that they would connect at? I was looking at
> > > possibly St-206 on the preamp board as that is open on my box and has
> > > four pins. Can anyone take a look at  and let me know if i
> > > should have a connector on at St-206 and what order the colors should
> > > be from top to bottom, it would be much appreciated. Thanks alot for
> > > your help! Mike in Fl
> >
> > > P.S. This box is the original firebird & has Es-IV boards in it- Zitierten Text ausblenden -
> >
> > > - Zitierten Text anzeigen -
> >
> > check out this one
> >
> > http://www.cdadapter.com/download/nsmcode4.pdf
> >
> > regards
> >
> > Ron- Hide quoted text -
> >
> > - Show quoted text -
> Mike,
> The vol. control in the box connects to the central computer at ST
> 206. If you had a remote vol. control it would connect to ST 205,
> with a 5-wire connection.
> As for connections, pin 1 is orange, pin 2 - green, pin 3 - brown and
> pin 4 - black. Don't have any Firebirds here, otherwise I'd take a
> pic. but still have manuals.
> Hope this helps,
> Gene
where are the pins located to hook up i have the wire but no plug on the end