Question about Pioneer SX-205 Receiver
The left channel allows no sound. Have owned this unit since new never had an issue with it. What might you suggest please. Thank you for your time in this matter.
Both final amps have old glass cylinder type fuses (automotive type) 3ag 3 amp surge fuses. I would look there first. The fuses are on the back labeled 3AG Left and 3AG Right power amp. They look like knobs twist them counter clock wise and pull them out. DO THIS WITH the power turned off.
If the fuses are good (remove them one at a time and check them with a multimeter on the lowest ohms range) connect your speakers and crank up the channel slowly ( use the balance control) that is not working and listen for noise on the speaker. (You can do this with ear phones plugged in the front also but you may require a mini to large phone jack adapter).
Adjust the balance. If there is noise but no sound then there is a possibility that one of the final amplifier transistors are not working or one of the preamp stage transistors have gone bad. If the unit keeps blowing fuses the big power transistors on that speaker channel have shorted internally and need replacement.
Next I would work the switches having to do with the A+B functions on the front panel. If you do not have the speakers connected select the internal load function on the front panel so that the amplifiers are connected to at least 8 ohms 60 watts each with the volume below half. Also check your speaker to make it is good by turning off the unit and switch the speakers on the back of the unit. Then turn it on and repeat this test. Does the problem stay on the same channel or change with the speaker?
If you take off the cover always disconnect the power cord from the wall. Never do anything inside the unit with the power connected to 115VAC. I've learned that the hard way too many times.
If you find a bad fuse, remember that some of the transistors in the unit are matched A-B pairs so if there are two transistors per channel you need to replace both. e.g.: If one goes bad it usually weakens the other and a new transistor on an A-B pair can cause the other to crash when it is installed causing the new one to crash also and blowing out the fuse again. This should be done by a repair shop.
If the SX has not run for a long time one of the coupling capacitors on the output amp may be bad. Check also for anything around the large transistors near the back of the SX-9000 (inside) that looks like it might have black charred marks on it or around it. If something appears to have burnt out you will need a repair shop.
I have had some problems with dirty switches on my SX-9000. Also dirt and dust is always a problem. It may need some cleaning and the switches cycled through the functions several times.
Unless you know what you are doing I would not recommend using contact cleaner or volume control cleaner on it. However, if you do, use only about a milliseconds worth of spray. The idea is to get the spray inside the controls or switches one at a time and then to operate the switch or control fully at least five times. Never do this or anything inside the SX with the SX-9000 plugged in.
This is a really old post but I will be back to check on it daily for a few weeks. I will try to help if I can.
Posted on Aug 05, 2009
Could be as simple as a bad connection at one of the regulators or as complex as a blown channel. These are good units that are worth the repair cost. Where are you located?
Posted on Jan 30, 2009
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