Hi i have nice table its wooden and my amp just exactly fit to that table from left and right side means no space beetween right side and left side of amp and wood construction beside amp ihave lot of space and below amp same lot of space is that dangerous obstructed these left right side of amp i mean i have noticed that most of heat is behind and a below over the amp can u give me the advice??
Thx a lot
It is not so easy to probe into to find a protection fault condition. The fault can be your output drivers- the MOSFETS/IC's fitted for both the channels, 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. Even a fault in the preamp stages that drives in high current into the output can shut the Amplifier. Sometimes this can be a noise like a HUM or HISS before the protect works. Faulty capacitors in these circuits also can cause similar issues and needs close observation.In this case I think that some capacitors are faulty as when the set is put on it charges on to make the amplifier work. Possible fault in the protect circuit or preamp.
You need to confirm and replace the specific stages or 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.
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http://www.retrevo.com/s/Marantz-SR4001-Receivers-review-manual/id/511ag801/t/1-2/
Page 48: See the note at the lower right.
After "PROTECT" appears on the unit's display, the standby indicator may start flashing. if it does, there is a problem in the unit or the connection. If this problem reoccurs even when power is activated from the remote control unit, call for servicing.
Generally speaking, an amp protects itself from heat, shorts and overloads 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. Check for loose speaker connections as a root cause for intermittent shutdown.
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