Question about Audio Players & Recorders

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Hello i have a Sansui G9700 reciever It seams that every thing is fine however no sound comes out of either speaker ,any ideas what to replace or where I can trust to send it. thanks Bob 7155736143.

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  • barnetzke Apr 10, 2011

    All fuses were not blown. I could not trace back from the fuses to the transistors so we checked the ohms from the top side of each fuse to each speaker terminal. The left channel measured around 50 to the positive of both left speaker terminals and the right channel only measured to 20 at most. What is a high and low rating for the ohms for these? And do I measure the ohms to both the positive and negative speaker terminal? Also, do you know which fuse goes to the transistors? The safely operate light is still on when turning on the reciever, is there a type of reset for this? Or is it possible that with the right side being a lower ohm, it is making the reciever go to safely operate? Thanks Bob

  • barnetzke Apr 10, 2011

    We have a Sansui g9700 reciever that turns on however the green "safely operate" light is lit when the reciever is turned on. We have checked all of the fuses and ohmed each fuse to each speaker terminal (we could not trace an individual fuse to the speaker terminals, so we tested all of them) the left channel ohms out at around 50 and the right around 20. We're not sure which wire comes from the fuses the speaker terminals, which is why we tested all fuses. All lights come on and reciever seems to be functioning fine, but with no sound coming out. Thank You.

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Hi,

Posted on Apr 10, 2011

  • Danilo Baraquiel
    Danilo Baraquiel Apr 10, 2011

    recievers have a fail safe operation system it activates whenever an error in the circuit occurred to prevent fire and further damage..In your reciever first thing to check is the output transistor/IC.You can replace them immediately.then you also check for any relay switch output to the speakers.This relay switch holds down when it detects any shorted in the system like a shorted speaker,shorted diode,transistor etc.you can test the speaker with a multimeter if the coils are shorted.speaker resistance reading is from 4-8 ohms beyond this reading speaker is defective.perform first this steps and lets see whats next just post back...please also state your actual address so I can provide you a service center near to you...Thank You!

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The speaker protection relays may not be turning on or a power amplifier fuse may be blown. The most common cause for this is a shorted transistor in one channel. Look inside for fuses and check them with an ohmmeter. If one is blown, trace the circuitry from the fuse clips to the power transistors mounted on the back. When you identify which fuse terminal goes to the transistors, measure the resistance from this fuse clip to each speaker terminal. It should be a very high value or open. If it reads a low value (generally a fraction of an ohm), one or more of the transistors in that channel is bad. In that case, you should also check from the other fuse to the speaker terminals to make sure the complementary side transistors for that channel are still good. DO NOT replace the fuse until you are sure there are no shorted transistors. The preceding tests are done with the receiver unplugged.

Likewise, if the amplifier remains in standby mode when you turn it on but the fuses are good, it may have an offset detection circuit that locks out the speaker relays if an output transistor is shorted.

The next possibility is the audio source switch has a problem, but it seems unlikely that would knock out both channels on all sources.

Posted on Apr 04, 2011

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