Multichannel (surround) is a different beast and quad is like two independent stereo or maybe four mono amps but similar to the 2-channel scheme. The 4-speaker two-channel design is not designed to handle such loads so a circuit, breakers (fuses) and other protection devices will shut the amp down (standby in newer designs) until a proper load is returned. Drastically altering this creates stresses on the amp that will harm it in an indeterminate time (damaging or destroying the outputs). Standard stereo to four speakers cuts power in roughly half algebraically when using the same general impedence (ohms). OUTPUTS-are any of the wires shorting against the chassis? Trim and replace them.ĭo not place more than one speaker in any single output nor bridge outputs/speakers to multiple outputs. A bad remote sensor may open and prohibit operations.ģ. Batteries dead? Is there a battery inside the amp for memory?Ĭ. Is the unit remotely controlled? Check to see if you need to operate the remote for something. Likewise for the selection switches/knobs and any muting.ī. Is the tape monitor engaged? Has the monitor switch become stuck? Poke at it a good deal to see if it's working.Ģa. What to look for in this period of Sonysġ. Otherwise with the help of your father the tracing of the symptom indicator most likely will lead you to the source regardless if it is a false indication or a real one. Ken Bernacky at Stereo Surgeons might be a better choice as long as he has experience with one of these. Sony service as far as I see now is just in it for the money and you will probably not hear from them without having a unit in there. This would need to be a gross DC voltage on the outputs but is also an indication of the DC offset. If you have access to the woofer of the speaker and you turn on the amp you want to see if from the resting point of the woofer if the cone is drawn in or pushed out with no sound. Speakers can burn up with a large DC going into them. This can usually be a very good first step to see if the amp is doing what it is suppose to or that a little or big something is wrong. I would put the meter on DC and check with no music but speakers hooked up if there is any DC on the speakers. If the Red LED is on there is something going into that detection circuit that it does not like.
#Sony ta f555esx manuals online manual
The item you are looking for is the detection circuit which the service manual can direct you to find. I also worked at the two Sony factory service places in Illinois for some time. Measuring the LED is a waste of time in my opinion but who listens to me as I just started servicing electronics 37 years ago. The service manual is all you need and a little understanding of what to look for. how am i supposed to enjoy my life knowing that the red light means bad? It stays red even when nothing is connected.īut the thing that i've read in other places is that i shouldn't even be able to hear anything without the green light. In such a case, disconnect the power source and check the connected components and speaker systems" The indicator lights in red when the unit detects shorting of circuit of the speaker outputs or in case of short circuit of the inputs of DC components. When the amplifier stays in a stable operating condition, the indicator lights in green. Immediatly after turning ON the power, the standby indicator lights in red as the built in muting circuit activates. and i did see a picture of a ta-f700es online that has a green light.
i'm assuming that means three wires? there are three wires. I opened the ta-f444esx today to check for three leads on the light.
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