Marshall MG50DFX Fan Noise Problem
Gremlin Dude
look through the groups (well, i have looked, but not had much
luck)...newho, i bought a Marshall MG50DFX Amplifier sometime in
february and it worked fine up until last week. now, when i turn on
the amp after a period of it being off (can be as short as 3 mins)
there is a god-awful grinding noise. neone know wot this is because
it is very very very annoying that its on its way out as soon as i
bought it. should i return it to where i bought it (tho i aint got
the box for it nemore) or should i get it repaired, or could i repair
it myself and what would repairing it involve? help help help...this
sux bad cos everything i buy bollox's up. lol
ta muchley people
Laurence Payne
wrote:
Well, the good news is that it can hardly be anything other than the
fan. If you can get to it, have a look. Maybe you can just tighten
up what's loose, or re-align whatever's catching on the fan blades.
If the fan's faulty, it's probably a standard item. Try Maplins.
I guess you could have worked this out for yourself already :-)
If you're really stuck, I have friends who meet with Jim Marshall most
Sundays. They could ask him :-)
CubaseFAQ www.laurencepayne.co.uk/CubaseFAQ.htm
"Possibly the world's least impressive web site": George Perfect
Les Cargill
Have 'em ask when Jim will write a book. Seriously. That would
be a good thing. And I worked with a guy whose scoutmaster
was Paul Klipsch.
:)
> CubaseFAQ www.laurencepayne.co.uk/CubaseFAQ.htm
> "Possibly the world's least impressive web site": George Perfect
--
--
Les Cargill
Gremlin Dude
Thanks for the help guys. yeh, i did figure i could replace the fan,
but i wasnt too sure if u can just replace it with any generic cooling
fan. from what i have read around the place, Marshall MG series amps
use cheap fans which is why they commonly go wrong. so if i buy a new
fan maybe i could replace it. i did have a look at the bak of the amp
and i can see it may be a little difficult for me to access the entire
cooling fan section. there is a metal cage covering the fan itself,
which is easily removed, but frm then on i cant see how i can detatch
the fan from the heat sinc in order to replace it. still, i don't
fancy sending it bak just for a trivial problem like this.
Neone else had this problem or has neone else successfully replaced a
fan on a MG50DFX or ne other amp for that matter? Ideas and pointers
will be great! :)
Thanks
Andy
>
> Thanks for the help guys. yeh, i did figure i could replace the fan,
> but i wasnt too sure if u can just replace it with any generic cooling
> fan. from what i have read around the place, Marshall MG series amps
> use cheap fans which is why they commonly go wrong. so if i buy a new
> fan maybe i could replace it. i did have a look at the bak of the amp
> and i can see it may be a little difficult for me to access the entire
> cooling fan section. there is a metal cage covering the fan itself,
> which is easily removed, but frm then on i cant see how i can detatch
> the fan from the heat sinc in order to replace it. still, i don't
> fancy sending it bak just for a trivial problem like this.
>
> Neone else had this problem or has neone else successfully replaced a
> fan on a MG50DFX or ne other amp for that matter? Ideas and pointers
> will be great! :)
Wrong newsgroup but anyway...
Bad batch of fans from earlier runs...
You can get by stalling the fan motor with a guitar pick or by tilting the
amp back which will sometimes make the squalling go away. The former will
eventually chew up a pick and the latter points the amp at your head which
looks cool and keeps the other band members from ragging on you.
Unplug everything, speaker cable also.
Remove screws from top of amp. The electronics will drop and slide out the
rear.
Stare at it awhile.
Dissassemble fan from chassis and jot down part number and connector style.
Run Google on the part number.
You'll land a hit at => Dynatron Corp. www.dynatron-corp.com
"AMD Recommended AthlonT Processor Up To XP 2100, XP 2200+, XP 2400+, XP
2600+, XP 2700+ & MP 2000+, MP 2100+ & MP 2200+ A Leading 1U & CPU Coolers
and Cooling Fans Manufacturer."
They're located out in the Bay Area. You'll want to spend a bit more and
not get the replacement with a journal bearing but a ball bearing. Also, on
their web site is a page with all sorts of connection styles. Give them a
call, tell them what you want, confirm the connection, give them your credit
card number and for about $13, you'll get your fan in the mail in about a
week, UPS.
When you get your fan, stare at the innards one last time, and reassemble...
A computer tech or amp tech can easily do the job.
When you look at the circuit board, you'll notice that the 50DFX uses the
same board as the 250DFX only without the additional parts. If you're
ambitious, while waiting for the fan, you can scrounge up the extra parts
and turn your 50DFX into an 250DFX :-)
Regards,
Andy