Question about Harman Kardon AVR 630 Receiver
I have never seen my internal fan turn on. The heat sink gets up to 120 deg F and the fan still doesn't run. It is too hot to touch. What temp is the fan supposed to kick on at, and how can I replace the temp sensor?
I concur with Robo, 120 degrees is normal and nothing to worry about. I have a Harman AVR-245 that idles at 118 deg and peaks around 122 in a room with ambient temperature of 70 on a Sanus open-air stand. My Yamaha RX-1700 idles at 124 and peaks around 130.
This is not necessary but you can reposition the temp sensor in most Harman AVRs. By default the sensor is screwed into the aluminum heat sink on the back-right side near the illuminated volume control. If you look closely at the heat sink you should be able to spot another pre-drilled hole closer towards the power supply. The power supply is the main source of heat. This is where I attached the sensor.
After repositioning the sensor I have not noticed the fan come on. But with Harman's build quality being suspect, having the sensor in a more appropriate place gives me piece of mind.
Posted on Mar 23, 2008
I have the avr630 with JBL home theatre speakers..... its amazing what this amplifier can do.
Recently though when I use it for like 2 to 3 hours none stop it switch's off! :(
I sent to the workshop to see whats wrong but they say the amplifier is fine.
Please let me know wat u guys think and wat i should do!
email me at: email@example.com
Posted on Nov 16, 2008
Dont be too concerned, 120 deg f is not that hot for an output stage. hehehe we get air temps nearly that high here in Australia... you really DONT want the fan running all the time anyway, particularly when listening at lower levels, as you can hear it operating(they do annoy me at least). This is not the case when you have it CRANKED. By design, internal heatsinks can and do get VERY HOT, and fans are required to assist the cooling operation of the heatsink when needed. I would be concerned if it did not kick in by 180 deg f. Semiconductors in output stages have operating limits well beyond this.Hope this has reassured you.
Posted on Feb 17, 2008
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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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