Question about Audio & Video Receivers
I suspect that this is a design problem guys. The fan in this unit is fine, it only turns on when volume is turned up high & fan speed varies with volume.
The problem I think is the STRX6759 on power board. The aluminium heatsink is too small to dissipate enough of the heat from the device. You will burn yourself touching it!!
The STRX6759, whilst I can't find the datasheet on the component it looks to be a voltage regulator with a thermal cut out. When it gets too hot (probably after an hour) it cuts itself off to protect itself until it has cooled enough. Then you need to turn unit off & then on again to reset.
I am modifying a friends unit with bigger heatsink but damaged a coil. If anyone can kindly supply me with coil. Part Number: LF902 please contact me: ian873 (at) gmail.com (in Sydney, Australia)
Posted on Apr 04, 2010
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Jul 19, 2011 | Audio & Video Receivers
Generally speaking, an amp protects 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.
Check for loose speaker connections at the speaker as a root cause for intermittent shutdown.
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