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Re: Pioneer SA-9500 Extremely Loud Crackling
The volume control and tone controls are dirty as well as the selection switch. This is common for older units. These controls and switches need to be cleaned with an electronic switch cleaner which should be available from an electronics store. Spray each control/switch and work them (turn repeatedly). Repeat this procedure a number of times and the accumulated dust/dirt will be cleaned and the unit should no longer have the problem.
Please note that it is possible that there is a transistor or 2 that are breaking down that can cause this as well. If the cleaning does not resolve the problem, let us know.
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Is the dc voltage reading on the base of the outputs 0.6 with emitters reading 0.014 or there about. Depending on the outputs used you might read 1.2volts on the base. Your collectors will read the power supply voltage of 50 or 60volts or more. If this is what you are reading on your meter the problem is in the speaker protection circuit. This circuit is what drives the relay you tested.
I would say no it is not worth fixing. Use it till it burns out then dont bother with it. Im trying to find the service manual or the schematic diagram but all links turn up negative. But the parts to fix it if you knew how to solder circuit boards would be about 20-30 dollars including shipping. But i couldn't say for sure what it was without looking at the diagram. Im sure this isnt what you want to hear but i would once it doesnt work at all just buy a new one or a used tv off your local craigslist. Thanks, Midwest-tek
If you have good clean, loud sound with your LP player and not with your PC, your PC is causing the noise. Most PC sound cards are not very HiFi in their sound and it is quite evident when listening to a PC via a HIFI sound. Now, you can not use the headphone outputs to your Pioneer, you must use the LINE OUT jack, set as line out in your computer. There is a signal level mismatch if you use your headphone outs, distorting your Pioneer. Try LINE OUTs or buy a HiFi rated sound card.
To stop the
crackling sound, you need to remove all of the dust particles from the wire in
the back. Sometimes when the unit is extremely dirty you can see sparks emanating
from the wire, this is what causes the crackling sound. The unit has a built in
cleaner you can lift up and down to perform this task, located on the top, but
this doesn't work extremely well.
I usually take a can of compressed air and blow as much of the dust I can off
the wire and all surrounding internal areas as I can. This along with a
thorough cleaning of the blades should eliminate the crackling noise. Of
course, make sure the device is unplugged before performing any cleaning.
Not sure about the smell though. Mine has started to smell a little strange and
I haven't figured out how to fix that problem.
Your amp is fitted with two 2SD588A (NPN) and two 2SB618A (PNP) power transistors in the output stages. Click on the part for a place to get them from. These parts are no longer available from Pioneer, nor are the prescribed replacements. (the amp was built in 1978) Because of the unusual transistor package used, you may have to upgrade to a more modern transistor, and modify the mounting also.
can you still hear? if you can you prob need to have just the LCD replaced. if you cant hear your flex cable might have to be replaced or might have gotten disconnected. So you phone did not get wet just dropped? if so you can take it to a repair shop and have it fixed if you have the money but i would fix it myself it is not too hard and you can buy the parts off ebay, so much cheaper. My razr's display recently got ruined because it got wet. repair shop said they would not touch it since it was water damage. they said to get knew phone. im glad i did not listen and decided to fix myself. everything but the screen worked. since i still could make calls and hear i knew it was not the flex cable( connects bottom half to top) and that it must just be the lcd. my dad has same phone and i used his to see if i was right. i was so i order a lcd part from ebay for $30. Thats with shipping. so if i were you i would try to fix it myself it is not too hard