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..
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