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How test my Amplifiers if it still works - Audio & Video Receivers

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Connect a male to male phono lead to the amp input. Turn it on and place a moist finger on centre pin of each channel. If the amp is working you will get a hum from the speakers. Make sure the volume control is not set too high!

Posted on Apr 21, 2008

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How many watts per channel in a technical pro rx55uribt 1500w reciever


What is in a Watt.
Although Watt should be a dimension of power (current times Voltage) most manufactures give numbers you can't use. They always speak of maximum power. That number only can be reached in a laboratory and is measured on a clean resistor. They try the lowest resistor (not an impedance) the amplifier can work with, without blowing the end stage.
Then they put a free marge to tell you it should have a musical power of xxxx Watts. The output differs for speakers of 2 ohm, 4 ohm or 8 ohm. But there is not one speaker with an impedance over the whole audio spectrum.
Just read something over audio and power amplifiers.
The output has nothing to do with the quality of the sound. I have heard 15 Watt amplifiers perform hundred times better then some kilowatt amps.
Even if the manufacture says the amp is 1500 w it could be within legal limits and fir the amp is measured and can't deliver 100 watts of real power nobody can do a thing, because the watts could be the musical power. and that is a free invented non measurable measure. I don't even want to start over distortion, because the cheaper amps do produce more distortion, than music. If you use it for a sub woofer that is no problem, because you feel more than you hear.

Sorry for this big story and not saying what the real output is, because nowadays nobody bothers measuring amps like this.
The more serous audio magazines, will put some test about amps, and you should read one or two test to know what I mean about the worth of watts in audio.

Jul 12, 2014 | Audio & Video Receivers

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Dish Network Stereo Receiver Remote Codes


This is the From the Dish Network website. http://tech.dishnetwork.com/departmental_content/techportal/content/tech/remotes/TechRemo5.3Code.shtml You can also call them for information on your set-up at : New customers call: 1.888.825.2557. Current customers call: 1-888-686-2388. CODE Aiwa Amplifiers 636, 641, 656, 687, 718, 720, 774, 775, 726 Bose Amplifiers 761 Carver Amplifiers 653 Citizen Amplifiers 709 Curtis Mathes Amplifiers 734 Denon Amplifiers 647, 674, 757, 758, 759, 760, 762 Fisher Amplifiers 653, 741 GE Amplifiers 711 Goldstar Amplifiers 677, 69 Harmon / Kardon Amplifiers 640, 672, 751 Hitachi Amplifiers 717, 754 JBL Amplifiers 640 JVC Amplifiers 637, 683, 703, 725 Kenwood Amplifiers 649, 676, 691, 726, 728, 745 Luxman Amplifiers 752 Magnavox Amplifiers 654, 705, 740 Marantz Amplifiers 651, 740, 742, 743, 764 NAD Amplifiers 739 Nakamichi Amplifiers 671, 748, 750 NEC Amplifiers 716, 739 Onkyo Amplifiers 642, 660, 662, 678 Optimus Amplifiers 648, 664, 734, 744, 749 Panasonic Amplifiers 643, 644, 652, 742, 746 Pioneer Amplifiers 658, 667, 668, 679, 702, 734 Proton Amplifiers 654, 705 Quasar Amplifiers 652, 742, 746 Radio Shack Amplifiers 744 RCA Amplifiers 635, 638, 704, 727 Sansui Amplifiers 753 Sanyo Amplifiers 741 Sharp Amplifiers 712, 713, 714, 715, 749 Sherwood Amplifiers 646, 670, 736, 738, 744 Sony Amplifiers 639, 645, 650, 687, 728, 728, 730 Soundmatters Amplifiers 763 Teac Amplifiers 684, 737 Technics Amplifiers 643, 644, 652, 742, 746 Toshiba Amplifiers 710 Yamaha Amplifiers 663, 730, 731, 732, 733, 745, 747

on Jun 06, 2009 | Toshiba XB1507 Receiver

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Bose sa3 amp, blew a fuse in it, replaced it and now it won't power up. Nice little amp, would like to find out how to test out what is wrong and fix it


If you can,check with your multimeter to see if the two voltage rectifiers are good.If they are OK,you may need to replace the 2 audio amplifiers.This will require proper tools and good experience.

Jan 06, 2013 | Bose SA3

1 Answer

Not powering on


To troubleshoot amplifiers when it's not starting up

check the base to base voltage of driver transistors might be too high.

Make sure that the amplifier's ground wire is tightly attached. If it doesn't look too good then take it out and clean it. Use a metal brush to clean that area.

Low power may cause your amplifier not to turn on. Make use of voltmeters to check if your amplifier is getting the right amount of power for it to work. Amplifiers need 110 volts or less to function if the power coming in does not reach that it means you have la defective power cable. If the power is alright and it reaches a minimum of 110 volts, and your amplifier still doesn't turn on that means that there is a problem with its power supply. Checking an inline fuse helps you to determine the appropriate amp ratings when you troubleshoot amplifiers. This is the best way to troubleshoot amplifiers with power problems.

To troubleshoot amplifiers that seems to be on standby mode

Look into your input sensitivity. An input control allows you to match output voltage that is coming from the main unit going to the amplifier then to the stereo speaker. The amplifier shuts down if the gains are
adjusted too high. This is simply because it overheats when it is set too high thus it automatically shuts off. When you troubleshoot amplifiers and this happens you will notice that the volume gets lower even if the setting is too high. Be aware of the optimal levels of the components when you troubleshoot amplifiers.

Your speaker's electrical impedance may also contribute as to why your amplifier may be turned on but doesn't seem to work. Impedance is the amount of current which flows with a specific voltage throughout the transistors, capacitors, etc. Just see to it that your amplifier and speakers equal in impedance range when you troubleshoot amplifiers. Use the voltmeter to check the impedance range when you troubleshoot amplifiers.


Take care..

Sep 14, 2011 | Audio & Video Receivers

1 Answer

Display shows overload and receiver shuts down


This means that one (or maybe more) of the amplifiers is shorted. Remove all speakers cables and try again. If you get the same message that means that one (or more) amplifiers is fried. To find which and why you will have to open the unit and test the amplifiers.

Jul 31, 2010 | Pioneer VSX-D412 Receiver

1 Answer

System turns on but only hear feedback fomr speakser no sound


do the headphones work?that means the pre amp is working.
the speaker protection is maybe activated from shorted wires on the back,there should be a click 5 to 7 seconds after turning it on.
that is the relay that connects the speakers.check the speaker a and b switch. people are not aware of this,but alot of amplifiers ADD the a and b speakers,to prevent too low an impedance from parallel wiring.unless there is 4 speakers,no sound.

May 22, 2009 | Pioneer VSX-D409

1 Answer

How to test a Amplifiers if it still works


Connect a male to male phono lead to the amp input. Turn it on and place a moist finger on centre pin of each channel. If the amp is working you will get a hum from the speakers. Make sure the volume control is not set too high!

Apr 21, 2008 | Audio & Video Receivers

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