SOURCE: volume level dropping unexpectadly
The A1 has an internal self diagnostic program which you can go through to find the fault. You can access the diagnostic program by simultaneously pushing some buttons on the front panel. The Yamaha service manual for the A1 tells how to do it and what the diagnostic codes mean. You can get a copy of the service manual on the web from several suppliers for a small fee.
SOURCE: pop from speakers when using dolby digital mode, works fine when not using any processing mode
Over 10 years old? Could be bad capacitors... if you have the expertise, you can try taking it apart and checking them with capacitance and ESR (equivalent series resistance) meters. Otherwise, you can try to see if any capacitors are exhibiting any "bowing" or leaking; if the top of the capacitor is bowed or puffed out - even slightly - or if there is a brown or white residue around the base of the capacitor, you can guarantee the capacitor is bad. Note that not all bad capacitors exhibit these physical attributes... but you can be sure a good capacitor won't.
If all of this sounds too complex, your only recourse will be to take it to a reputable electronics service shop.
SOURCE: Sony STR-DH510 Multi-channel AV receiver
The STR directs sound to the center as instructed by its speaker setup. You say the center does not work on calibration. Is it defined?
Prove another speaker does or does not work on the center output. Then we'll know if it's the receiver or the speaker ensemble that has the problem.
Have you checked the manual for this "
There is no sound, or only a very low-level sound is heard from the center/ surround. "?
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