Question about Radio Shack 250 Watt PA Amplifier Amplifier

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OPTIMUS XL-260 POWERS ON WITIN 3 SECONDS GOS INTO PROTECT MODE

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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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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One Wire
  • 126 Answers

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.

Dean Pitts
Rollin CBs
rollincbmods@yahoo.com

Posted on Jul 19, 2008

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Shuttle83
  • 1139 Answers

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

petraman7
  • 1175 Answers

SOURCE: How to wire in 12 8 ohm speakers to a 100 watt

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

dunnbiker
  • 8546 Answers

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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Why doesnt my subs play music through my amplifier all the wires are hooked up


Make sure that your amp is getting power. This means check the ground wire and make sure it is solidly connected to the vehicle chassis in a paint-free location. Also make sure that the live power wire from the battery is connected properly, and that the in-line fuse is not blown. Make sure the power wire is a large enough gauge to supply the required power to the amp. You will probably need at least a 6 gauge wire. Also check the input leads from the head unit. These are the RCA cables and the remote wire. The connection must be good at both the amp and the head unit. Then check the speaker leads and confirm they are connected to the proper inputs on the amp (the user manual will tell you which inputs to connect these to). Finally, make sure the amp is not in protect mode. There will usually be a light on the amp that indicates if it is in protect mode or not. If it is, consult the user manual to decode why it is in protect mode. If you do all of this and it still doesn't work, it is possible that your amp is broken and you will have to get a new one.

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1 Answer

Protect mode on. All wiring is operative without incident. Power and all is working, but will not come out of protect mode and all fuses are brand new.


it could be one (or more) of several issues. ensure none of the speaker wires are connected to the ground of the car, or to each other. ensure the speakers are not blown. check to see if the amp comes on ok without the speaker wires hooked up. your battery may be low - check voltage at the power terminals of the amplifier to ensure you have operational voltage. you may not have a sufficient ground connection - ensure the ground wire is less than 18 inches, is of proper gauge (minimum 10 gauge, the lower the gauge the better), and is connected to a sturdy connection going right to the ground plane of the car - make sure the paint is scraped off from under the point at which the ground wire terminal is screwed to the ground.

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3 Answers

Pyle PLA885 amplifier blows 25amp fuse. Ideas?


signs of a short, did any wires touch while you where hooking or un hooking the amp? if not then the internal power supply probably has a short in it and needs to be repaired. you can swap the fuse for a good one and hook it back up and make sure you don't touch any wires and if it blows it again then your issues is internal and will need repair if it doesn't and everything seems fine then wires could have touched or the amp was ran past it's limit and blew the fuse to protect it self. good luck and ask any more question you have

Sep 24, 2009 | Pyle PLA885 Car Audio Amplifier

1 Answer

Amplifier doesn't power-up


3 possible reasons you amplifier is trying to protect itself.

* Ground sensed on Positive terminal - could be shorted wire, stray wire strands from terminals, blown voicecoil on speaker - speaker wire touching ground.

* Thermal/impedence shutdown - Amplifier load is below rated minimum, amplifier has been overworked and is too hot (mostly due to improper load or gain setting too high.

*Internal Problem - Output channel or IC blown... causing an internal fault.

Thanks for using FixYa - a FixYa rating is appreciated for answering your FREE question.

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1 Answer

Thumping speakers - no power light is on - wired correctly


the amp is going into protect mode due to something wrong in the amp or some thing in the wiring to it ooh yea if you are getting 18v power to the amp that is way to high it should not be higher then 15v if the amp is in protect mode it will not play at all.

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1 Answer

Protect at high volume


No such thing as too much power unless you have a faulty alternator/voltage regulator.
The hundred amp fuse at the battery is better than none but I would replace it with a 50 Amp, that fuse is really only protecting the power wire from grounding out and burning.

The gains are irrelevant, all they do is attenuate the input.
Set them so you cant hear any amp hiss or noise on quiet passages of music or between tracks.

Make sure your not starving the amp for power. Start at the battery connections and work your way back to the amp, inspect all connections for corrosion and make sure they are tight.
Check the ground wire . It is just as important as the power wire!! Try to ground it as close to the amp as practical, scrape off the paint down to the metal use a oversize screw with a star lock washer and a ring terminal.
Make sure that your power wire and ground are at least 8 gauge.

Next on the list is your speakers and related wiring, check to make sure that your impedence is not too low for the amps rating. and that the wiring is correct and at least 16 gauge, 12 is better.
. You can check the speakers impedance with a Ohmmeter, it wont be exact but it should be close +/- .5 Ohm If you are bridging, make sure the speakers are wired in parallel + with+ and - with - .check the amps rating and bridging configuration, it's normally left positive, right negative, but check!

Having done all the above, and you still have a problem only two possibility's left, Defective speakers or the amp. Check with a qualified installer, buy him lunch, you'll get good advice forever.
I hope it helps. Regards Paul

Jun 11, 2008 | Lanzar VIBE266 Car Audio Amplifier

10 Answers

AMP turns ON then turns off


The power antenna wire only supplies 12vdc when the radio is on. When CD or other sources are selected, the power antenna wire goes to 0vdc. The remote turn-on wire provides 12vdc whenever the head-unit is on. If your amps are powered on only when the radio is turned on, I would bet that you have the power antenna wire connected and not the remote turnon wire.

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