Question about Yamaha RX-V557 Receiver
When the unit is switched on the display comes up as normal, after speaker connection delay the unit switches off.Sometimes you can hear the speaker relay click, other times there is no click, the unit just turns off. Have disconnected all cablesw from rear of unit and result is the same. The fault has progressed from just occurring a couple of times then unit would work, but now the fault is continuous. When the unit did connect to the speakers it worked fine. Only once did it turn off after during use after an hour or so. The unit first started to play up within warranty, but was intermitent, the fault only became permanent after warranty expiered. hope someone may have a solution to this problem
Hello, you must first tested with a voltmeter in DC entrance if you have a DC voltage on all the terminal outlet speaker, normally you must obtain 0Vdc+/-50mV on each out speaker with control volume to minimum, you can stay or remove the speakers during this test.
Posted on Oct 14, 2008
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Posted on Jan 02, 2017
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It is not so easy to probe into to find a protection fault condition. The fault can be your output drivers- the mosfets fitted for both the channels,or a short in any of the primary circuits. Use a meter after disconnecting to check for short in the drivers. Disconnect the positive and negative voltages to the output and see if the protect changes.
Elimination of the circuits will determine the fault. If so replace the outputs. If not there can be issues in the mother board, maybe the protect circuit by itself is shutting off due to a faulty bias , maybe a leak in any voltage/current sensing circuit.Also disconnect the speakers and test, if the protect is off then check for short on the speakers.
May 02, 2011 | Audio Players & Recorders
Generally speaking, an amp protects itself from heat, shorts and overloads.
Overloads can be from excessive periods of high output 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 hands-on tech.
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