fuse problem - pioneer sa-7500

pezza89 · 26th January 2008, 05:48 AM

Hi there ,

i have a pioneer sa-7500 which seems always blows the main fuse on the rear whenever you try to use it. any ideas what could be causing this? Any help is much appreciated, thanks! Andy

EchoWars · 26th January 2008, 07:38 AM

Blown mains fuse generally indicates blown output transistors. Pull them out and test them.

pezza89 · 26th January 2008, 07:41 AM

thanks for that...if i check them and their gone, is it safe to change them or does it mean something else caused the outputs to blow??

sakis · 26th January 2008, 07:09 PM

outs you have to look the overall of the machine ...hapend to me before that rectifier was shorted ( twice ) and of cource if outs are gone drivers is also possible .....ofset and idle should be checked ...and goes on

it could be from a very easy thing to a very difficult task .....

poynton · 26th January 2008, 07:22 PM

Hi,

Are we talking about the mains fuse or the DC fuses inside??

Check the voltage setting. Is it set for the correct voltage ?
(Australia 220v)

If it is the external mains fuse, are the internal fuses also blown ?

Andy

pezza89 · 26th January 2008, 10:05 PM

hey all, thanks for everyones help so far!! It is set to 240v which is the correct voltage for australia...the amp is in storage, i'll get it tomorrow or the next day to check to see if the internal fuses have also blown. The one i was referring to was on the rear panel.

Do i need any special equipment to check the BIAS and DC offset?? any pointers on how to do this??

Cheers!

26th January 2008, 05:48 AM	#1
pezza89 diyAudio Member Join Date: Sep 2007	fuse problem - pioneer sa-7500 Hi there , i have a pioneer sa-7500 which seems always blows the main fuse on the rear whenever you try to use it. any ideas what could be causing this? Any help is much appreciated, thanks! Andy

26th January 2008, 07:09 PM	#4
sakis diyAudio Member Join Date: Jan 2006 Location: nea makri athens greece	except outs you have to look the overall of the machine ...hapend to me before that rectifier was shorted ( twice ) and of cource if outs are gone drivers is also possible .....ofset and idle should be checked ...and goes on it could be from a very easy thing to a very difficult task ..... __________________ SERVICE ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr

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26th January 2008, 07:38 AM	#2
EchoWars diyAudio Member Join Date: Dec 2002 Location: Left of the Dial	Blown mains fuse generally indicates blown output transistors. Pull them out and test them.

26th January 2008, 07:41 AM	#3
pezza89 diyAudio Member Join Date: Sep 2007	thanks for that...if i check them and their gone, is it safe to change them or does it mean something else caused the outputs to blow??

26th January 2008, 07:22 PM	#5
poynton Magneto the Gravity Man diyAudio Member Join Date: Mar 2005 Location: A life on the ocean waves when I'm not at home in N. Wales (but I'm not Welsh so no sheep jokes!)	Hi, Are we talking about the mains fuse or the DC fuses inside?? Check the voltage setting. Is it set for the correct voltage ? (Australia 220v) If it is the external mains fuse, are the internal fuses also blown ? Andy

26th January 2008, 10:05 PM	#6
pezza89 diyAudio Member Join Date: Sep 2007	hey all, thanks for everyones help so far!! It is set to 240v which is the correct voltage for australia...the amp is in storage, i'll get it tomorrow or the next day to check to see if the internal fuses have also blown. The one i was referring to was on the rear panel. Do i need any special equipment to check the BIAS and DC offset?? any pointers on how to do this?? Cheers!

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