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Yamaha Stagepas 300 fan noise

RamblinStu 16 Mar 12 - 07:17 AM
Richard Bridge 16 Mar 12 - 09:04 AM
Big Al Whittle 17 Mar 12 - 07:38 AM
GUEST 17 Mar 12 - 03:28 PM
GUEST 17 Mar 12 - 03:30 PM
Lester 17 Mar 12 - 03:30 PM
GUEST 17 Mar 12 - 03:51 PM
GUEST 17 Mar 12 - 04:11 PM
Richard Bridge 17 Mar 12 - 07:46 PM
bruceCMR 18 Mar 12 - 03:59 PM
Mick Pearce (MCP) 18 Mar 12 - 04:32 PM
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Subject: Yamaha Stagepas 300 fan noise
From: RamblinStu
Date: 16 Mar 12 - 07:17 AM

My Yamaha Stagepas 300 has developed a loud noise from the internal fan.
Do any Catters have any advice on how to solve this problem?

Thanks

Stuart Pendrill


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Subject: RE: Yamaha Stagepas 300 fan noise
From: Richard Bridge
Date: 16 Mar 12 - 09:04 AM

Usually new fan but I know a man in Whitstable - Yamaha approved - who may be able to resurrect the old one


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Subject: RE: Yamaha Stagepas 300 fan noise
From: Big Al Whittle
Date: 17 Mar 12 - 07:38 AM

How loud?

I've got this model pa.

Its certainly noticeable - the fan noise. I always start by putting the master volume at zero. the individual pots at twelve o'clock.

Make sure the output on your instruments are well up. there are batteries working in anything that needs a pre amp.

Then cautiously advance the master volume.

I always use a combo for my guitar these days - its just a better sound.

for real white noise hiss- always cut the high frequency eq - thats where the bugger lives.


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Subject: RE: Yamaha Stagepas 300 fan noise
From: GUEST
Date: 17 Mar 12 - 03:28 PM

Thanks Big Al but it's not reproduction noise but physical noise from the fan, or fans.
I found out what to do but not sure hoe to open the amp unit. They are supposed to be alan keys, but they don't look like alan heads.

Help


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Subject: RE: Yamaha Stagepas 300 fan noise
From: GUEST
Date: 17 Mar 12 - 03:30 PM

Sorry that guest was me RamblinStu sans cookie


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Subject: RE: Yamaha Stagepas 300 fan noise
From: Lester
Date: 17 Mar 12 - 03:30 PM

In which case they are probably Torx screws. Used to stop user fiddling, you can buy Torx drivers in Maplins.


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Subject: RE: Yamaha Stagepas 300 fan noise
From: GUEST
Date: 17 Mar 12 - 03:51 PM

Remember - some replacement fans don't make it obvious enough which is the right way round
to attach them so they blow air in the right direction..


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Subject: RE: Yamaha Stagepas 300 fan noise
From: GUEST
Date: 17 Mar 12 - 04:11 PM

Thanks Lester, good old Maplins, I'll go and see them, and most likley end up with shed loads of stuff I don't want, but find I need once inside, and of corse I'll try a Torx thingee, never heard of them before but that is why I can't solve my prob.

Cheers

Stuart Pendrill, sans cookie


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Subject: RE: Yamaha Stagepas 300 fan noise
From: Richard Bridge
Date: 17 Mar 12 - 07:46 PM

The screws could also be star drives, or tamper resistant allen's (with a little dum in the middle to stop the allen key going in). Scrutiny with magnifying glass is advised.

Be careful - a computer fan may well be the wrong voltage and some Yamahas have temperature controlled voltages to fans so that they run faster as things get hotter.

And to make matters more exciting some have cunning protection circuitry that won't put power onto the amp if the back is open.

The EMX300 series pulls both of those tricks but the fan is nothing like a computer one, more like a miniature centrifugal fan heater...


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Subject: RE: Yamaha Stagepas 300 fan noise
From: bruceCMR
Date: 18 Mar 12 - 03:59 PM

There are 2 fans inside this unit.

There's a service manual available from http://elektrotanya.com/yamaha_stagepas_300.pdf/download.html

That site (not in english) should have a "download manual" button at the bottom right - I see it when I view the site in internet explorer, but not firefox! But it does allow you to download the full engineers service manual, which contains disassembly instructions, and part number for the fans.

If I'm deciphering the part numbers correctly, they are 50 and 40mm fans respectively, 10mm thick, 12V

They don't appear to be temperature controlled, based on a brief glance at the circuits.


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Subject: RE: Yamaha Stagepas 300 fan noise
From: Mick Pearce (MCP)
Date: 18 Mar 12 - 04:32 PM

That site complained about downloading being blocked so I had a look for another.

This page: 300 Service Manual has two entries for it. The 1st hung when I tried it, but the 2nd downloaded without problems. The manual has Chinese translations but they seem to be just added to the English manual. There are sections on changing both the small and large fan.

Mick


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