Question about Sony CMT-HP7 CD Shelf System

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So I connected 8 speakers to this system and I might have blown it out. when i connect it the red standby light comes on. then when i press the power button the screen goes blank as if turning on but remains blank and then there is a red light comes back but blinks. The stereo doesn't turn on. this model is CMTHPZ9. Is there a quick fix.

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Audio output shorted out or blown fuses in power supply check all fuses if fuses are good your Audio out put transitors or I.C has been shorted out as a result of impedence over load in future dont connect speakers in parallel in those small Audio units.

Natureisland technician

Commonwealth of Dominica

Posted on Nov 19, 2010

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Standby indicator flashes


When the "Protection" indicator comes up the display panel of my receiver or the On/Standby LED is flashing, does that mean my receiver needs to be repaired?
The "Protection" light comes on when the receiver's current sensing and thermal monitors detect some unusual operating condition that, if left unchecked, might damage the amplifier. This can happen if there's a dead short in a speaker wire or if you're using very low impedance loudspeakers at high volume for an extended length of time. On older model AVRs you may see the word "Protect" on the receiver's display. More current models will indicate a flashing red light on the Standby LED when a Protection circuit trips
n thermal cases, the circuitry will automatically reset after a few minutes of cool down and the Protection indicator will go out and normal operation will resume. If the protection light came on due to a speaker wire short, low impedance condition or a bad speaker, the receiver's power will need to be turned off to reset it. Before turning the power back on, all speaker wire connections should be checked for their integrity at the receiver side and at the speaker side. If the protection light goes on immediately after you turn on the receiver, disconnect the speaker wires at the receiver side and retest. If the receiver's protection light goes off, then there would still seem to be a problem with one channel's speaker wires or speakers. Connecting them one by one and retesting should allow you to find the problem speaker or connection.
If after checking all your connections, the Protection indicator stays lit, you may need to "initialize the microprocessor (see the FAQ on that topic) or take your receiver to an authorized repair center for a diagnostic. The "Initialization of the Microprocessor" or "reset" procedure can be found in your owner's manual on current model AVR product. Please note, this will erase all setup configurations in the system and require the system to be setup again. You may want to mark down the settings before resetting your receiver to aid in the setup process. If you had an installer setup your system, you can contact them for assistance and any associated costs that may apply to setup the receiver again would be the responsibility of the owner.

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Why dont I get sound from my speakers but the radio works


If you have an equaliser, check that you havent accidentally pressed the button which switches between the main input and aux or bluetooth. Right, if you have aftermarket sound system, check that your RCA's/(look like av cables) arent unplugged broken off or damaged. Another thing is to see if the amps come on (usually shown on amp by a green light) red if not on. Check the power wire from the battery to amp, check if fuse is not blown. Ground the amps properly for the amps to come on and check that the power cable is connected properly as well. Another fault could be blown speakers.

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Sounds like either a blown mainpower fuse or the thermal fuse for the power transformer. If the protect circuit was kicking in, the display would light up, but then turn off with a red blinking light. the green light with no display means the transformer is not getting power.

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My Panasonic sa-ak770 will not come out of standby mode


Check to make sure there are no shorts in the speaker wiring, if okay remove speaker wires from back, press power if it comes out of standby the wires or speakers are the problem, if there is no change the protection circuit is not functioning or the audio output ic's have a short.

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I have a JVC TH-C30 system, the red standby light comes on with power applied, but when I go to turn on the system, the standby light goes out, the system appears to be on, then turns itself off within...


When one reports a fuse replacement it would be helpful to know if that was a Hail Mary wild guess or if the fuse was indeed blown.

Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

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Yamaha RX-V465 switches off when increasing volume beyond -21.0dB


What speakers you have connected? This receiver supports only 6 and 8 ohm speakers (not 4 ohm). Also check if the ohm settings are correctly set in Advanced Setup (in standby press on the front panel STANDBY while holding STRAIGHT button). In this menu check the setting SP IMP. (speaker impedance) if it maches your speakers (6 or 8 ohm).
Disconnect all inputs and also all speakers. With nothing connected, try to increase the volume. If it still will power off, the unit is probably faulty and should be repaired.
If it does turn off only with speakers connected, check the speaker wires and the speakers, the problem will be there.

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After turning ON the power/standby switch, the unit(receiver) display comes ON (green light) then after approx.4-5 seconds the display goes OFF and the unit defaults back to the standby mode (red light). I...


Is the red light flashing at first?
The unit may be going into protect mode. Lets hope it has done the job and the receiver has protected itself from failure.
Protect mode can result from speaker wires touching each other or the Amps2_bing.gif metal case. Check that first.
It can also be caused by unstable ohm loads if too many speakers2_bing.gif are connected to any of the outputs especially zone 2.
If you can remove all speaker wires and turn the unit back on. If it stays on, turn the volume down on the main zone and zone 2 if connected. Then reconnect speaker wires.

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No Power


I mwas gonna suggest that you need the speakers attached but you stated later that it did the same thing with the speakers attached. The unit switching off after it checks its self is NOT a normal thing. TAKE IT BACK BEFORE ITS TOO LATE!! GOOD lUCK

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Aiwa NSX-TR77


Well Jamez sounds like you have eather blown the soeakers or the output IC's inside the unit. If you have a meter you can simply disconnect the speakers and test the resistance of the speakers with an ohm meter. If you dont have an ohm meter then you can connect them up to another stereo or have them and the unit tested at a repair center. Sorry not really any serviceable parts in these systems. Good Luck

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