Hi
At the yamaha-psr-styles forum, this problem of background noise (hiss noise) at PSR 2000 is under discussion as you can read in the under posts.
I had noticed the same hiss noise on my previous PSR740.
Can someone in this forum give some contribuition to clarify this problem?

Thanks
Carlos Rodrigues

Hi all,
I recent bought a PSR2000, at time of buying my dealer didn't have it
with software version 1.2 so I borrowed one until he got a new
shipping with keybords holding version 1.2 and not 1.1 as was in the
one I borrowed.

So I got the new PSR2000 with version 1.2 and I discovered that this
Keyboard actually has an error/bug, turned on with out playing there
is a low 'white noise' from the speakers. This noise appearently does
not go through the amplifier as it does not change when I change the
amplifier volume. This noise it not to hear through the head phones.

Has any one observed this too, and do you know Yamaha's position to
this i.e. will the repair it under the warranty and how long time
will it take ?

Thanks in advance
Dan


Hi Dan,
I have a version 1.10 and also it has the hiss noise
exactly as you describe. My PSR 740 (I had before the
PSR 2000) also had this noise. Looking at the electronics
schematics we can see the cause of this hiss noise:
There are per channel two OP (operational amplifiers)working
as an active filters and one Integrated Circuit (IC) working
as a fixed equalizer, before the power amplifier,
that cause this noise.
As the actual noise is more or less the same level as my
precedent PSR 740, which also had that devices I thought
this was normal. However as you refer that you had
one borrowed without that noise, I'm surprised.
In this case I guess that the OP or the IC have internal
default quality transistors that cause that noise.
However I guess will be dificult to find the OP or IC with
internal low noise.
I hope to hear more comments about this point.

As you have played the two releases (1.10 and now the 1.20)
can you tell me if you notice some differences in the two
releases. I am in dificultiy to decide for the upgrade
as mine 1.10 works properly and I don't know any bug
that 1.20 version solves. And as you know the upgrade
involves an dificult des/soldering operation of two EPROMs.
Can you tell us whose bugs 1.20 solves?

Thanks
Carlos Rodrigues

Dan/Carlos,
I too have exactly the same problem. I had presumed that this was
normal. It can't really be heard when the keyboard isn't being played
and it didn't get any louder when turned up, or played through an
amplifier. My OS is version 1.10
If you find anything out, I would be interested to know.

Thanks, Paul.

My 2000 also doesn’t have any noise. It was one of the first received in the USA.
Steve

Perhaps my ears don't work so good, but when I turn on the PSR2000, I
don't hear any noise coming from the speakers. I have one of the
early 2000's with the initial OS.

JoeWaters


Hi again,
sound interesting, looks like the tolerances of the systems are pretty
narrow. I, of course gets a bit uncertain whether the my previous
keyboard, with OS 1.1 really didn't have any background noise but I
feel pretty sure.

To Carlos: I must admit that I, at present haven't observed any
differences with repect to software capabilities. I simply insisted on
getting version 1.2 as I knew it was the current version.
I haven't so far seen any clear listing of the differences between the
software versions. As far as I remember some of the improvements were
in the area of registration settings/saving.

Back to the noise issue: My keyboard teacher once told me that the
first series of keyboards (YAMAHA) normally comes from Japan, and
later on the production is outsourced to some where else. Furthermore
some optimisation is done as well. Our background noise could be a
side effect of this optimisation.

Has amy one of you approached YAMAHA on this issue ?

My teacher has a PSR2000 too, an I will ask him tonight whether he has
the hiss noise. He got one of the first serie here in Germany so a
qualified guess would be that he does not have the noise... I will
keep you posted.

Best regards
Dan

Have you noticed any difference in the hiss when the mic gain control located at the back is all the way down vs being set higher up. I know this has been a source of noise in the PSR740's, PSR2000's, and the PSR9000's.
George Kaye
Kaye's Music Scene
Reseda, California

I have a similar problem, except the keyboard (PSR2000) makes a cracking noise when there are too many instruments playing at one time. I thought notes would just drop out. Does anyone know a solution for the problem?

George,

As we said, the hiss noise is independent of the Master Volume control button; this is, with the master volume at zero (full anticlockwise) the hiss noise has the same level. So the mic amplifier noise, at that position of the master volume (zero), is reduced to zero because the signal lines R and L are connected to the ground by the Master volume.
The noise, I guess, come from the pre amplifier after the Master volume control (the two OP and the internal fixed equalizer - I'm not refering to the equalizer we have access through the display; this is made by the digital circuit and software before the Master volume control).

Carlos Rodrigues

Hi Rodrigues,
I have a "Y2K" (my 2nd) and it does have a "background-hiss" my take on the noise is that , IMO-is the "amplifier". Like you said it doesn`t impeed the sound, but when your not playing and it`s quiet , it can be annoying. I hope this helps!!
jedi

"Y2K-ver1.10-?" ?

Mine doesn't hiss. My pa80 does hiss a bit. It's a known deal with the pa80's. Has to do with the mic input. And, the pa80 can have a rather LOW volume. It is somehow related to the styles. I can't explain it. Nevermind.

Tom G.

Carlos
When I first got my PSR2000 I had hissing sounds and some that sounded like rushing water,etc and I even considered taking it in for repair, but I did the following:
did an initial setup by holding down the C6 key (the right most key on the board) and then turning on the power.
The noise was reduced somewhat and the rest of the problem was the fact I always have a mic plugged into the unit and when I started to turn the noise gate on and off and turn the dial associated with the noise gate - all the hiss etc disappeared.
If you don't have a mic plugged into the unit then I don't know what the problem could be.
RR