Question about Technics SUV500 2-Channel Amplifier

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No sound from one of the two speakers on my su500.

Each speaker works from on of the output terminals on the amplifier. What to do?
Thanks,
David

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  • Scott Frye
    Scott Frye May 11, 2010

    Hi...
    Are there speakers fuses on the back panel?
    If not , you'll need a tech to open the thing and check for internal fuses and/or speaker relays. It could have poor soldering issues


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I i remember correctly these amplifiers use their own brand power chips,if one channel is down normally that chip has blown,chances are small of getting replacement,st bet is to source faulty one on ebay and swop a good chip

Posted on Jan 18, 2009

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Posted on Jan 02, 2017

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One possibility is that the power-on speaker protection delay is stuck on. The most common cause of this is a shorted transistor in one of the power amplifier channels. In that case, you will need to replace the speaker driver transistors in that channel. I don't have service information on your particular model; it may use power amplifier modules rather than individual transistors.

The tricky part is identifying the amplifier power and speaker output terminals to test for this problem. To find a shorted output transistor, you need to measure the resistance between the output of each channel and the plus, then the minus power supply connections. There is a relay between the amplifier output and each speaker terminal on the back; this relay is turned off by the speaker protection circuit, so you can't measure from the speaker terminals. If you have a fried transistor, one of the tests will show a resistance of a fraction of an ohm. A good transistor will have a very high resistance or read open. This will be the case whether you have modular amplifiers or discrete transistors.

If you see a blown fuse, that is a strong indication that you do have a fried transistor. Sometimes the speaker protector circuit shuts down fast enough to save the fuse, but not always.

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Try to trace the fault systematically from one end of the system to another, starting with something that you know is working
  1. Start by checking your sound source (cd player or whatever) is working by connecting it to another amplifier or computer.
  2. Check the connecting cable is working from the sound source to the amp and is not shorted out.
  3. Make sure your loud speakers actually work (briefly shorting a 1.5 volt AAA battery across the speaker terminals should produce a crackling sound without doing any damage)
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  5. Try connecting something like your computer speakers (or use the microphone in jack on the computer itself) to the line output socket of the Jamo. If you can get some sound this way it would suggest that the internal output overload protection fuse may have blown. You will need to open the case to access this. NOTE if your JAMO is still in warranty take to authorised repairer otherwise you may invalidate your warranty.

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I was trying to find an owner's manual or picture of the rear panel of the sub, but had no luck. The subwoofer is a powered type - or "active" speaker. This means it has a built in amplifier. These active subs usually provide for one or both "low level" and "high level" inputs. Low level signals are usually carried by shielded coaxial cables and have RCA type plugs on the end. The low level is also called "line level". This is an un-amplified signal that might be heard on cheap earphones - but that's about it. It is similar to the output of a tape deck, DVD or phonograph. These signals require an amplifier to be heard. If you have a sub woofer output on your receiver or amplifier, you could run a patch cable between the low level input on the subwoofer and the subwoofer output of the amp or receiver. You receiver or amp may call this output "low frequency effects" or similar. The front and rear speakers would then connect directly to the receiver or amp's corresponding connections.

If you lack low level outputs on the amp or subwoofer, you'll need to run speaker wires from the amplifier or receiver's front left and right speaker output terminals to the subwoofer's high level input terminals. High level signals are speaker connections or amplified signals. These are typically connections that accept bare wire connections. The front speakers would then connect to the subwoofer's front left and right speaker output terminals. The rear speakers connect to the amplifier.

I hope this helps - and good luck!

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Depends on what, if anything, is connected to the High Level speaker inputs. The High Level outputs only pass on what is being fed to the Sub from your amplifier or receiver. The sub's internal amp is for its use ONLY.

If you're using the Sub's internal amplifier and feeding it the LFE or Subwoofer Line Level output of your amp or receiver via RCA cables, I'd be surprised if anything is present at the speaker terminals on the sub. It shouldn't be.

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Hi monmax,
I hope you are aware that in bridged mode your amp will become monaural (single channel, double power). If you still wish to bridge it:
Switch of power.
Set mode switch behind amp to "bridge" position.
Connect speaker positive to CH1+ve terminal of amp output and connect speaker negative to CH2 +ve terminal.
Be aware that now, in bridged mode your amps output power delivery is 1100 watts for a 4 ohm speaker and 900 watts for an 8 ohm speaker. Make sure your speaker can handle that.
Peace
Jango.

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