YAMAHA STAGEPAS 300: DO I HAVE A BLOWN AMP?

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Re: YAMAHA STAGEPAS 300: DO I HAVE A BLOWN AMP?

Unread post by Buzzard » Sun Jun 03, 2018 9:37 am

Interesting and confusing. :roll:

I have followed and read this topic for a while.

Overheating seems to be a common problem, but how common ?

Is the mixer meant to be taken out before use ? (that will probably give more cooling)

----------------------------------------------------------------------------------------------------------------------------------------------------
here's a cut&paste from the manual provided by Chris (Parametric):

Power shuts down suddenly:

􀁆 Is the volume set at high for an extended period of time?
If the mixer is used at a volume beyond the permissible level, the protection circuit automatically turns the power off.
Turn on the power again only after the mixer cools, since it cannot be turned on until the internal temperature goes down.
Reduce the volume with the MASTER LEVEL control so that the LIMITER indicator flashes only briefly in response to the
highest transient peaks.

􀁆 Is the vent on the top panel of the mixer blocked?
Since inadequate ventilation can result in overheating the mixer, the protection circuit may come on
automatically and the power may be turned off.
Turn on the power again only after the mixer cools, since it cannot be turned on until the internal
temperature goes down.
----------------------------------------------------------------------------------------------------------------------------------------------------

Basically Yamaha leaves it up to the user to know when loud is too loud,
giving the user only a peak indicator to help knowing. :cry:

Old school transistor amps at about 2x30 watts used to have way larger cooling fins, but no fan, that did the trick then.

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Peter
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Re: YAMAHA STAGEPAS 300: DO I HAVE A BLOWN AMP?

Unread post by TommyBoy » Mon Nov 05, 2018 12:49 pm

Hi All,
I have a stagepas 300 and it was working well up to a week ago. I set it up for a rehearsal and whilst testing it clicked as the limiter hit red and I lost all output although the power light stayed on and the volume lights jumped up and down as i spoke through the mic but just no sound through the speakers. I switched it off and on again and it worked although I hit the limiter again and it clicked and i again lost all output. It seems to function as it should although the limiter is hitting red at low volume so is effectively unusable. It hasn't been knocked or dropped and there is no smell of burning....does anyone have any idea please?????? Thanks
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Re: YAMAHA STAGEPAS 300: DO I HAVE A BLOWN AMP?

Unread post by horsforth1 » Sat Mar 02, 2019 6:59 pm

Hi
I have a similar problem to those described here on my Stagepas 400i.
I don't drive it hard and is quite happy to run for hours until it gets powered off either with the power button or someone tripping over a power lead. It then won't power on again for about 15 mins and has completely cooled. Before then when you press the power button just get a quick flash of the power LED and a click as presumably the thermal cut out says no.
It isn't running hot and I've checked the fans are running ok plus drilled a few more ventilation holes in the case - I take it out the speaker when running so plenty clear space around.
I'm reasonably ok with electronics but when I took the cover off I couldn't spot the thermal cut out, anyone know if it is a standard part and easily identified & replaced as that is my next step. It's currently not a big issue just an annoyance but bit concerned in case it goes more sensitive and starts cutting out in use. I really like the Stagepas as a PA so would like to resolve if anyone can help.
Thanks
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YAMAHA STAGEPAS 300 DO I HAVE A BLOWN AMP

Unread post by GeraldSen » Sat Mar 02, 2019 10:52 pm

I had one of those Park amps. It had two gain knobs. It wasnt my cup of tea. The amp I really liked was that little Peavey Classic 20. That little amp could put out and worked great with pedals. It would even drive a 4x12 pretty good. I traded it for a Sovtek Mig 60 when those first came out. I still have it but I blew the output transformer on it.
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Re: YAMAHA STAGEPAS 300: DO I HAVE A BLOWN AMP?

Unread post by Kurzweil » Wed Mar 20, 2019 1:17 pm

I have not one but TWO of these PAS 300 systems. One runs an hour or two (which is long enough for most of my gigs) and then shuts down. By shut down, I mean that the mixer continues to work but not the power amplifier section. The lowest green level indicator then flashes. I believe that this is the normal power protection circuit in operation.

My second unit now shuts down in less than 5 minutes. I will be checking for the overheating voltage regulator. I located a very comprehensive 54-page service manual at manualslib.com. Here is what was a good link on 20 Mar 19:
https://www.manualslib.com/download/919 ... s-300.html

These are very nice systems when considering the extreme portability of a PA built into a speaker with the necessary wires stored in the OTHER speaker and a six-channel mixer with fixed reverb and a monitor output. Well, the monitor out is really just a level control on a line level version of the main output. It is eight-channel if you cheat when counting the stereo inputs.
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Re: YAMAHA STAGEPAS 300: DO I HAVE A BLOWN AMP?

Unread post by parametric » Wed Mar 20, 2019 2:30 pm

Kurzweil wrote:
Wed Mar 20, 2019 1:17 pm
These are very nice systems when considering the extreme portability of a PA built into a speaker with the necessary wires stored in the OTHER speaker and a six-channel mixer with fixed reverb and a monitor output. Well, the monitor out is really just a level control on a line level version of the main output. It is eight-channel if you cheat when counting the stereo inputs.
I agree - these are a great concept - and I'm a huge fan of Yamaha Gear, However, I can't condone a system which is

prone to shut-down unexpectedly in this manner.

This type of system requires Headroom in the Spec and it should run all day if required.

Sounds to me like the spec has been "pared-down" excessively and as a result, overloads too easily.

The gigging Musician has enough to contend with - playing the right notes - remembering where the changes are . .

and deserves to ENJOY the experience of performance WITHOUT having a "Sword of Damoclese" hanging over his head,

wondering WHEN the gear is going to shut-down . . . . :roll:

Something needs Beefing up . . . . ? :x - else there is a real question (Here in the UK, at least) of a "Fit for Purpose" Challenge?

[/rant] :wink:

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Re: YAMAHA STAGEPAS 300: DO I HAVE A BLOWN AMP?

Unread post by Kurzweil » Wed Mar 20, 2019 5:36 pm

Remember that we are talking about gear that is probably a minimum of 15 years old. Horsforth's 400i is more of a current model, which tends to support your comment. Mine were quite reliable for years but I tend to keep out of the flashing red zone. I use them for senior centers where moderate volume is expected. But I'd play a Roland Atelier organ through it without issue and that included pedal tones. I tend to think my situation is due to deteriorating components, as shutting off in 90 minutes, and especially FIVE is definitely new. Still, other equipment I've had, such as two Peavey KB100 keyboard amplifiers and a Krate 60 bass amp both simply compressed the audio when you reached the 100 or 60 watt (respectively) limits. I didn't like what became the obvious volume limit but it never cut itself off. That may be a more rational approach. But the Yamaha cut-off method would give you the ability to do the occasional too-loud hit without the indignity of compression.

I am going to print off some of these responses and add them to my service manual for when I dig in to clean/oil fans and fondle 15-volt voltage regulators (turn it OFF first). Seeing the Yamahamusicians.com discussion of this mixer has encouraged me to locate the service manual (see link above) and take a whack at fixing these things. Thanks. I will report back.
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