Question about Audio Players & Recorders
Found a Pioneer SA-1050, visually it looked in great shape. They told me it, "ran like a champ". Got it home, plugged it into my turntable and two speakers, powered it up, but no sound. Starting trying out different settings. There are two Speaker buttons on this amp, an On and Off for A and B, which were on. Clicked on Off for both, got a blast of sound, then the amp powered down. Now there is nothing, dead, no lights, nothing. Opened the case, no burns from what I can see, no smell of smoke. Looks clean inside. Any ideas?
I would check the internal fuse(s) in the power supply. If they have blown replace them. If they blow again suspect a shorted power output device on the heatsink.
It's best to look at the soldering on the PC board, especially on second hand devices. This will show you if it has been repaired. If the soldering doesn't look like new, someone has been messing with it. They could have done anything to it, including fitting wrong parts, or fitting the right parts but not doing it right.
Posted on Jul 24, 2013
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Posted on Jan 02, 2017
Hi There DEKCAT
Its very unusual for both channels to blow......
I suspect that there is a blown power fuse inside the case......
There are fuses sometime located on the outside rear of the case and these can be easily checked to determine if they are blown..If you find one is blown please replace with the corrrect rated fuse,..... its current rating wil be on a small label on the case outside rear. like 1.0amp, or 1.5amp etc...
If you need to go inside the case please ensure the power plug is removed from the wall socket first.
You will find small glass fuses in the DC power supply feeds and probably one of these has blown, once again replace with the correct rated fuse.
Im not sure if your amplifier is a FET type or a large 32-40 pin IC type as if these are blown you will need a service person to do the replacement...
Please note there is a small relay that clicks 20seconds after turn on at the switch....if this click is not happening then there is problems with the timer circuit or the relay itself...
This relay controls the output to the speakers and as such stops all the sound output if its not working...so the first thing is to check all fuses, if they are OK then check the Relay operations....
Cheers From YUBEUT
Posted on Nov 16, 2007
SOURCE: Peavey KB 300 amp problems
You have have been unfortunate enough to experience an uncommon failure. The bass driver has failed. It is a Black Widow that can have the basket/cone/voice coil assembly replaced as a complete unit. The magnet unbolts from the basket and you bolt on a new one. Classic field service designed product. You will be able to get a new basket from a Peavey equipment stockist. Just ask for a 15' Black Widow replacement basket They cost about $180 here in Australia and you can easily change it yourself. Good Luck and happy jamming.
A FixYa rating would be great for my tech tip to you. Cheers
Posted on Mar 08, 2008
Have you checked all circuit boards for good solder connections.
Also if the boards had been wet from anything, you might clean the boards and resolder all connections specially in the power supply and audio section.
Let me know.
Posted on Mar 06, 2009
check your speaker selector switch to see if its on the correct setting ie; speakers one ( not speakers 2 ) also check your speaker cables by reversing them, ie; put right speaker cable into left channel and vice versa with the left etc? check also to see if your amp is set to headphone output by mistake in which case no sound will come out until you select the speakers instead? good luck.
Posted on Sep 14, 2009
i need a power amp. brand that has a 4ohms impedance that who will match my 307d2 4 ohms (pioneer) sub woofer that can use inside my house
Posted on Jan 13, 2010
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