I have had this amp for 5 years...its been flawless. However recently I lost one channel. I verified it wasnt a speaker by switching speakers wires on the amp to the good channel. I checked the 2 fuses on the amp...they are good. Do you have a wiring diagram before I tear into this..Im guessing one of the power amps ( internally) has had it. I am electronics savvy and have repaired things like before. I just like some insight from someone else, if youve already attempted this repair and if the parts are available.
Also I paid $300 for the amp and the 10 inch dual sub box...should I just call it done and get another amp at this point. Its been in my car and running for 225,000 miles...and its had A LOT of heat cycles.
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If you have switched speakers to make sure it's not just a blown woofer, then I'd suggest just replaceing the amp. It's odd for an amp to output treble but not bass on an output channel, and the tech time to figure this out could be more expensive than a new Phonic amp
I presume you are playing a stereo cd. Plug some other device, like headphones in to see if the computer is putting out stereo. Use the same plug as the speaker system is plugged into.
I presume you have swapped the speakers to test them.
If the speakers work, and the headphones work, it's the amp.
If you identified the specific products involved we (and you) might be able to look at the documentation and verify the obvious answer. Voice is generally concentrated on the center channel, so, yes, a speaker there would be a good idea.
If you don't have a multi-channel rig you shouldn't feed multichannel audio to it. Maybe use the unidentified DVD player's analog output and make sure it's set to mix the channels down to stereo.
The fact that you are gettng noise out suggests that the problem is in the "front-end" of the amp. It sounds like the pre-amp section is smoked. What you are hearing is a little distortion that is getting through the pre-amp stage. This can be as simple as replacing a few cheap ICs. I don't know your exact model specifics, but this should be a straightforward repair. Where are you located?
USE THE PROCESS OF ELIMINATION. SWITCH THE RCA INPUTS AROUND AND IF THE PROBLEM STAYS IN THE SAME CHANNEL, THEN THE AMPLFIER OR SPEAKER IS AT FAULT. IF THE PROBLEM SWITCHES TO THE OTHER SPEAKER, THEN THE PROBLEM IS THE RCA CABLE OR RADIO ITSELF. YOU CAN VERIFY YOUR FINDINGS BY STARTING WITH THE SPEAKERS FIRST. SWAP THE SPEAKERS AROUND AND IF THE PROBLEM STAYS ON THE SAME SPEAKER, THEN THE SPEAKER IS AT FAULT. IF THE PROBLEMS SWITCHES TO THE OTHER SPEAKER, THEN THE AMPLIFIER OR INPUTS ARE TO BLAME. BY FOLLOWING THESE TWO METHODS, YOU WILL BE ABLE TO DETERMINE EXACTLY WHICH COMPONENTS ARE AT FAULT. REMEMBER, YOU HAVE AN INPUT, AN AMPLIFIER AND A SPEAKER. THIS PROCESS OF ELIMINATION WILL HELP YOU IN THE FUTURE WITH MANY TYPES OF PROBLEMS. LET ME KNOW IF YOU REQUIRE FURTHER ASSISTANCE. I AM LISTED IN THE REPAIR LISTINGS ON THIS WEBSITE......V PS: MAKE SURE THAT THE GAINS AND BOOST CONTROLS ARE SET TO THE SAME LEVEL FOR BOTH CHANNELS BEING TESTED. ALSO MAKE SURE THAT THE BALANCE CONTROL ON THE RADIO IS STILL SET TO THE MIDDLE. DON'T WANT THESE CURVEBALLS INTERFERING WITH YOUR TROUBLESHOOTING......V
It could be that you lost the power supply to the surround amp IC or the Ic is defective. It should be mounted on a circuit board attached to the heatsink. Look for poor solder connections first. I don't recall the specifics of this model, but the surround amp IC should be easily located.
Update this with your progress and I'll try to locate the service manual in the meantime.
Cool amp mate, and becoming collectable now to. Sansui amps from the era where the best in the world of HiFi. iT may have lost bias control to the offending channel, it may have dirty source switches, tape monitor switch, or even speaker switching. The speaker protection relay may also have a dirty contact, will usually burst back into life with a quick rotation of the vol control. Can you pin the problem down a little more with the info i have given you, try all the controls to see if it impacts on operations, you will need to fix those problems first. Low bias would make that channel sound distorted at low levels also. Is this what is happening to you??