Question about Audio Players & Recorders
I have a Sherwood Newcastle receiver, model R-925. It is about 8-10 years old. It has been great without issues. The other day when it turned on, we had no sound. I checked all the connections and even plugged in an old pair of headphones in the older fat style headphone jack. No sound. The unit is no longer under warranty, so I thought there may be fuses inside, one of which had blown. I just checked it and all the fuses are intact. All the knobs, tuners, switches work.
I do not have nay repair facilities close to my home that I know of. I know this problem is very vague, but does it sound like something major, as in tank the unit & by new. Or, does it sound like something minor which can be easily fixed. I appreciate any hep or guidance you may be able to offer.
Thanks in advance,
According to the service manual. If the Power Indicator Light works and no there's no sound, then: (A) Trasistor Q215L/R or Q216L/R on the AMP302 Board is faulty.
(B) Pulled out of correct speaker switch.
The transistors you can look up the price on the net, it says they are: BKTC3200.
Posted on Jul 13, 2009
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Posted on Jan 02, 2017
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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.
Jan 22, 2011 | Sherwood RD-6105 Receiver
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