Question about Radio Shack 250 Watt PA Amplifier Amplifier
I TOUCHED GROUND AND POWER WIRE BLEW 50 WATT FUSE ON POWER 8 GAUGE CONNECTED TO POSITIVE BATTERY TERMINAL. NOW THE AMP POWEWRS ON THEN ...PROTECT RED LIGHT COMES ON, BUT FOR THOSE 3 SECONDS ITS ON THE SOUND WORKS AND ALL. WHAT CAN I DO?
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Posted on Jan 02, 2017
SOURCE: radio shack cb radio 21-1703
OK. I do not know the exact number for the diode off hand, because I don't have the same radio in front of me. On most cb radios, this diode is usually located on the component side of the pc board, close to where the positive lead solders to the board. Most of the time when it burns, it just becomes brittle.
If you do replace it on your own. The diode is called a rectifier diode, which you can pick up at radio shack or at partsexpress.com. The part number is between 1N4001 to 1N4008. When installing be sure to observe polarity, making sure that the side with the silver band is facing the direction of the arrow.
If I can help anymore, please don't hesitate to ask.
Posted on Jul 19, 2008
SOURCE: TRC520 CB wont power up
Hello, First of all you only have the Power wire Red, and the ground wire Black to connect for 12v DC to power the unit. If you memory power it is usually connected to a constant power source such as the cigarette lighter or continuous 12V dc powersupply off of the battery. These are the only connections that should be connected to provide power. Since the unit will not turn on I suspect that the CB's power supply and regulator have been blown. Another possible choice is that the radio was working and someone removed the antenna cable and the the RF power amplifier malfunctioned taking the power supply and regulator with it. To solve this problem, check the voltages on the wires before connecting them to the radio (these should be the 12 volt power off of the radio circuit, and the 12 volt power off of the continuous 12V connector (or the cigarette lighter). These voltages should read 12V. Connect the CB with it turned off and measure the voltages (should be 12V) Turn the radio on and check the voltages (should be a little less than 12V) If the radio does not come on then the internal power supply of the radio might be defective (In this case I would advise taking the CB to a qualified radio repair shop) I hope this helps Thank you, Shuttle83 http://www.electron-age-technologies-llc.com
Posted on Jun 11, 2009
Make 4 sets of 3 speakers each. Wire each of 3 in series.+ to - and + to - and + to -. Do this for all 4 sets.
Then wire one set + to another set + and - to - ( parallel)
Wire the 2 remaining sets the same way
Then, wire the + from one 6 spkr set to the other + of the other 6 sprk set. Wire the ( - ) to the remaining ( - ).
This will all total 6 ohms which the amp can drive.
Posted on Sep 07, 2010
SOURCE: i have a 250 watt
Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.
Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; 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 'nekkid'. 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 and competent hands-on tech.
Check for loose speaker connections at the speaker as another possible root cause for intermittent shutdown.
Posted on Aug 16, 2011
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