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

On Sunday, March 19, 2023 at 4:55:15 PM UTC-4, John Robertson wrote:
> On 2023/03/19 5:38 a.m., slim grossheim wrote: 
> > 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
> You aren't likely to get an answer from the OP (Gene) from back in 2009. 
> 
> However I suspect you are looking for a DIN style plug - that was what 
> NSM often used for audio connections including volume controls. 
> 
> Expand a bit on your particular problem and include the model and 
> exactly what you are looking for if the above is not enough information... 
> 
> John :-#)# 
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i have a firebird 2 and i have the wires which are hooked at the buttons underneath but i dont know where they connect to on the 
board no plug just the wires orange blue brown and green