|
Post by brendelac on Feb 8, 2015 14:34:00 GMT -5
Old thread, but I have a Parasound 2205AT with a similar issue. Channel 5 works, but has moderate static that comes and goes. Fuses look fine. Terminals look perfect. Definitely an amp problem as I purchased it in this condition and am hoping it will be a fix that I can do myself. All other channels are functioning great. You mentioned terminals "look" perfect. Have you switched both the interconnects? And after trying that switched speaker wire around? The interconnects and wire I am using are fine. I also have an XPA-5 that I am switching around with the 2205AT. Same wire and cables. No probs when the XPA-5 is in place of the 2205AT. vcautokid, the fuses are on the same board as the heat sink (it isn't very big though) and are actually directly beside it. I can get a pic if that will help.
|
|
|
Post by qualityaudio on Feb 19, 2015 23:18:50 GMT -5
After years of helping customers troubleshoot problems with their systems while working for the late and great Tech Hifi, Tweeter, etc., and (possibly soon-to-be late) Radio Shack, I think I have developed the simplest method of determining the culprit when one channel is dead or distorted. Hope this helps.
Troubleshooting steps with one bad channel (dead or distorted). Note, if the problem exists with only one source (i.e. DVD player or cable box), start with Step 5 if troubleshooting separates, and Step 7 if troubleshooting a receiver.
1. Invert your speakers. Move left speaker to right and vice-versa. Does the problem follow the speaker? Yes: Check the fuse. If the speaker has no fuse or the fuse is not blown, the speaker needs repair. No: Go to next step.
2. Invert your speaker connections at the amp. Move left to right and vice-versa. Does the problem follow the connection? Yes: The speaker wire is defective. No: If using separates (preamp/processor and power amp), go to next step. If using a receiver, go to step 7.
3. Invert the inputs on the amp. Move left to right and vice-versa. Does the problem follow the connections? No: The amp is defective. If the channel is dead, check the fuses. If the fuses are not blown and/or the channel is distorted, the amp needs repair. Yes: Go to the next step.
4. Invert the main outputs from the preamp. Does the problem follow the connection? Yes: The interconnect cable is defective. No: If the problem exists on all sources, the preamp needs repair. If the problem exists on only one source, go to the next step.
5. Invert the input on the preamp from the source. Does the problem follow the connection? No: The preamp needs repair. Yes: Go to the next step.
6. Invert the output from the source to the preamp. Does the problem follow the connection? Yes: The interconnect cable is defective. No: The source is defective and needs repair. No further troubleshooting is necessary.
7. If the problem exists on all sources, make sure you complete steps 1 and 2 before proceeding. If the problem exists on only one external source, invert the inputs on the receiver from the source. Move left to right and vice-versa. Does the problem follow the connections? No: The receiver is defective. If the channel is dead, check the fuses. If the fuses are not dead, or the channel is distorted, the receiver needs repair. Yes: Go to the next step.
8. Invert the output from the source to the receiver. Does the problem follow the connection? Yes: The interconnect cable is defective. No: The source is defective. No further troubleshooting is necessary.
Notice we're working from the end of the line to the beginning and simply swapping connections between one channel and another. The above works on systems with any number of channels, but always use the same two channels as you work your way through the steps.
|
|