Question about Rotel Audio Players & Recorders

1 Answer

Power amp r b 981 no power to the speakers. Pre amp seems to be ok. Headphones work.

Posted by on

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Rotel Master
  • 5,190 Answers

Check the headphone socket if it cuts out the speakers (normal use) when you plug the headphones in. If it doesn't and you have a switch to switch off the speakers when listening to headphones, check the switch. It may be physical damage or dirt causing the problem, or even loose soldering on the headphone socket. But the fact that headphones work shows the main amp is working. Also make certain the speakers are connected properly.

Posted on Sep 28, 2010

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Left speaker not working when plugged into amplifier


If it works on the other channel, then you have a faulty amp. If the sound is good on headphones then the left power amp has gone. If not then you have a left pre-amp problem.
If the speaker doesn't work at all on any channel, then either there's a bad connection inside the speaker or one or more of the internal speakers have blown.

Feb 25, 2014 | Audio Players & Recorders

1 Answer

Right speaker terminal not working - tested out both speakers and they work fine when independently tested on the left speaker terminal. Sony MHC GX45 Shelf System, 2 speakers and 1 sub.


If the sound is also dead on that channel on a pair of headphones. Then you have probably lost the main power amp for that channel. To be certain. With you headphones on, slide or turn the balance control so you can only hear the faulty channel. With some music playing turn up the volume. If you can hear "faintly" music playing then the pre-amp is OK and the power amp has gone.
The power amp will be located on a heat sink. It will consist of 4 transistors (2 for each channel) or one big device (or two) (an IC). If it is transistors you only need to replace the two for the right channel.

Aug 31, 2013 | Sony COMPLETE PWB, MP-45 Shelf System

1 Answer

Speakers and headphones do not work


Sadly this could indicate that the main power amp has failed. You should try turning it up really loud with some music playing. If you can hear it very faint, then the main amp has failed. If you can hear hum, then the pre-amp might be the cause. The only other cause is that the headphone socket has broken, cutting off both speakers and headphones.

Aug 06, 2013 | Onkyo Audio Players & Recorders

1 Answer

A friend recently gave me a Pioneer deh-p5750mp car stereo cd player and I'm having trouble installing it. I have successfully managed to connect the positive, earth and constant power wires and...


One thing to remember about most radios, the RCA pre amp circuit will still work even if the mosfet power amp inside the radio does not. The best way to know if the amp inside the radio works is to use one matching color pair coming off the radio to wire up a random speaker right to the radio. You can use just about any old random 4 ohm speaker that is laying around to check it. The best solution if the amp inside the radio is blown is to replace the radio or amp the pre amp outputs with a small 4 channel amp. Oh, by the way. What vehicle are you connecting this into? And does the vehicle say Bose, Infinity, or ect sound or Premium sound? These usually denote a factory amplifyer already onboard and requires special connections to get the signal to these amps to then be delivered to the speakers.

Sep 12, 2011 | Car Audio & Video

1 Answer

The "output" is two RCA


hi,
normally in any amplifiers or pre amplifiers the RCA sockets used only for pre input and output. for speaker out always there will be binding post or speaker sockets, u can connect the pre amps RCA output to ur power amps input. there will be seperate connector for speaker connection in ur power amplifier . You didn't specified the make and model number of ur amplifier and pre. need any further help feel free to contact.
ok

Dec 20, 2010 | Audio Players & Recorders

1 Answer

Fault must be in preamp, I got it wrong! TEAC A-H300


Just curious, what preceded this? Sudden spontaneous failure with no manual action associated? Is the Tape Monitor activated?

I don't know how valuable your speakers are but you're hitting them with max power and distortion when you get that bang. I'd use cheap headphones for the troubleshooting phase.

Mar 02, 2010 | Teac A-H300 Amplifier

1 Answer

Peavey minx 110 no sound from main speaker but headphone jack is ok. speaker wires are attached ok.everything on the board appears to be in good shape.amp powers up and all controls work great through...


Inside the headphone jack is a built in switching mechanism. It is there to cut off the sound to the speaker when you are using headphones to practice quietly. For some reason or another it seems as if this is no longer working correctly. One of the causes of this can be bad solder joints on the circuit board where this jack is located. Another cause is a failure of the jack itself. If you are capable, Take the circuit board out and have a look. Hope this helps.

Oct 27, 2009 | Music

1 Answer

Have Rotel RB-1080 stereo power amplifier. Problem: no sound from left-hand speaker. All connections are OK. Get sound from left-hand speaker when I connect it to the right-hand speaker connections of...


Try to plug a set of headphones into your amp.

If only one is working this means that either you're not getting both signals into the unit (check the signal input connectors, resolder any bad contacts), the signal doesn't get to the preamp or from the preamp into the power amp or the signal does not come from the power amp (check solder connections on preamp and power amp components, also check internal connectors - unplug, clean, reconnect).

If both headphones work well instead, then you're getting both signals into the unit and the preamplifier and the final amplifier are OK, since many amps derive headphone signal from the power amplifier via some power resistors - check for any power resistors around the headphone plug or in the section that has wires going to the headphones plug to see if this is the case - if it is, this means that the signal does get amplified, but it is not getting from the power amp to the speaker - in this case, check the following:

--- speaker connector solder contacts on the circuit board could have some damage - resolder if necessary


--- A / B speakers selector switch (if there is one, it could be a physical switch or a soft touch button driven relay so check for both) - there might be a bad solder contact on the switch pins or the switch / relay contacts may be dirty - resolder and/or clean the contacts (if they can be easily accessed).


--- final amplifier section: bad solder contacts on any power transistors, voltage regulators, power resistors, diodes, coils or other components, including internal connectors (anyway, if both headphones work well, these are all unlikely because the power amp is sending both signals out OK, however, you may want to give it a check, just in case...)


--- delayed speaker turn on relay or other relays - check for dirty relay contacts, clean with some fine sandpaper (you need to remove the relay cover which can be a bit tricky / difficult to access, mostly it's a snap-on cover, could also be resin filled and therefore impossible to open).


It could as well be a bad power amp (do the headphones test), the above suggestions are just a quick look at some common audio amp problems and possible solutions.

Also, if your unit has got many hours of use, it would be fair to check the input signal connectors - the solder contacts do get damaged when you plug / unplug the RCAs many times.

Hope all of this is not getting too lenghty and confusing... just post me some feedback if you have questions.

regards

3rq8 (Triarcuate)

Sep 10, 2009 | Audio Players & Recorders

1 Answer

Speakers are connected to pre-amp or power-amp? pls explain connections , what connects with what , between cd player + pre amp + power amp + speakers.


Do this, CD audio out jacks to the PRE-AMP INPUT jacks, then PRE-AMP OUT jacks to AMPLIFIER INPUTS then from AMPLIFIER to speakers, This will work similiar with any sound source unit ie. Radio Tuner, Tape deck, etc. Just think of it this way, a PRE-AMP is BEFORE the AMPLIFIER, all the AMPLIFIER is going to do is AMPLIFY the sound to your speakers, HOPE THIS HELPS!

Feb 03, 2009 | Audio Players & Recorders

Not finding what you are looking for?
Audio Players & Recorders Logo

Related Topics:

126 people viewed this question

Ask a Question

Usually answered in minutes!

Top Rotel Audio Players & Recorders Experts

 Grubhead
Grubhead

Level 3 Expert

5190 Answers

The Knight
The Knight

Level 3 Expert

74482 Answers

richie46

Level 3 Expert

12962 Answers

Are you a Rotel Audio Player and Recorder Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...