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Cyrus 2 amplifier 1 channel not working - Audio & Video Receivers

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My brother-in-law had the same problem with his Cyrus 2 and fixed it by removing the cover and blowing compressed air (carefully) to blow out the dust and muck on the inside.  That fixed the problem for him.  It has been almost a year since your question--I hope you still have it so you can try this fix.  It's a great amp worth the easy fix.

Posted on Apr 07, 2009

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1 Answer

YAMAHA RXV 350 Right Speaker not Working


The amplifier for this channel is NOT working.

Feb 09, 2012 | Yamaha RXV-350 Receiver

1 Answer

I have vestax 05pro2. Left channel works but out of one speaker. The turntable input is good. Im thinking Its either the channel fader, or the rca inputs for that side. Has anyone had this problem?


Hi,
Here's a solution to see if you have a problem with either your receiver or turntable.
The turntable has 2 RCA's one red for right channel, and one white or black for left channel, which plug into the back of the amplifier.

  • Unplug both RCA from rear of amplifier.
  • Plug in a cd or dvd player into those inputs on the amplifier, the sound will be lower but it will give you an indication if the amplifier is ok or not.
  • If you have sound on both channels left and right then the amplifier is good
  • If you still only have sound on left channel, then there is a problem with the right channel input on the amp.
  • If your amp, is good, unplug the cd /dvd player.
  • Put a record on and start playing the record
  • Plug the white or black RCA from the turntable into the rear of the amplifier marked left, you should have sound.
  • now unplug it from the left and plug in into the right red RCA socket, if you have sound the amplifier is working fine.
  • if there is no sound there may be a problem with the stylus cartridge on the turntable
  • now lets reverse the test
  • unplug both RCA from amp.
  • Plug the red RCA into the left socket on amplifier, if there is sound, turntable is working fine, if no sound there is a problem with either the stylus cartridge or that red RCA cable.
  • now unplug the red RCA from the left side and plug it into the right side socket
  • if there is no sound there may be a problem with the stylus cartridge or RCA cable.
I hope this helps

MobileJB

Jul 15, 2011 | Audio & Video Receivers

1 Answer

Conncet a sony sub to a denon reciver


Depending on the model, there are two ways to connect a subwoofer to an amplifier, receiver or processor. The best way is to connect the subwoofer to the SUB OUT or LFE output of a receiver, but some subwoofers can be connected to the speaker level outputs of the receiver or amplifier.


1. How to Connect a Subwoofer to the Subwoofer Output


The preferred method of connecting a subwoofer is through the LFE or Subwoofer output (SUB OUT) of a receiver. Almost all home theater receivers (or processors) and some stereo receivers have a subwoofer output. The LFE (Low Frequency Effects) is a special output for subwoofers and is often labeled 'SUBWOOFER' not LFE. 5.1 channel programs on DVD discs have a dedicated .1 channel output with bass-only content that is best reproduced by a subwoofer. Connect the output of the LFE or Subwoofer jack to the Line In jacks of the subwoofer using a single RCA cable (the two jacks on the left in the photo). A 'Y-Cable' may be necessary to connect the LFE output to both the left and right channels of the subwoofer.

2. How to Connect a Subwoofer to Speaker Level Outputs
Some receivers and amplifiers do not have an LFE or Subwoofer output. In this case you can use the speaker outputs of the receiver to connect the subwoofer. Using speaker wire, connect the left and right channel speaker outputs of the receiver to the left and right channel speaker level inputs on the subwoofer (the speaker inputs on the right side of the photo). Using speaker wire, connect the left and right channel speaker outputs on the back of the subwoofer to the left and right channel front speakers.

Hope it helped..

Apr 20, 2011 | Denon Audio & Video Receivers

1 Answer

Is it possible to hook up a powered subwoofer to this unit? It has a centre pre-out, but nothing labelled for a sub, and the manual is useless. This is a very nice old receiver, works perfectly, and I'm...


I own 2 of these Pioneer VSX-D903S units.

The only way to hook a powered subwoofer up to a VSXD903S is if your subwoofer is equipped with amplified/speaker level terminals on the back, in addition to the line-level input. If you only have a line-level input, do not attempt to hook it up to this receiver.

If you're lucky, and have speaker-level inputs on your powered subwoofer, you would use the amplified terminals (connect to B-channel on the receiver). DO NOT connect anything to the line-level connection.

Alternatively, you could build two unpowered subwoofers, then set the receiver's Impedance switch to LOW, then connect one enclosure to each of the "B-channel" outputs. Connect your regular left and right speakers to their corresponding "A-channel" outputs. [Impedance range: 4 Ohm minimum, 16 Ohm Maximum]

(To the guy [dunnbiker] that says there's no rear channels: You're wrong.) The VSX-D903S has 2 stereo (A/B) channels, dual center channel (place center speakers to the left and right, or above and below the screen), and two rear satellite channels. It is a 3-Ch Logic/Dolby Pro-Logic Surround equipped receiver, not a DolbyDigital/DTS multichannel x.1 surround unit.

Dec 19, 2010 | Pioneer VSX-D903S Receiver

2 Answers

Pioneer vsx_D710S whatever can be the input source,the flag " poweroff" apears and switch off the system. Seems to have no time rules, shut down frequency connected with hazard ...... No...


I'm not sure what kind of an answer you are looking for. If you are not qualified to do some soldering rework and ready to spend some money (could be as much as 50$) for parts, you better look for a professional service that in most cases will cost as mush (or more) as your receiver.

If you are still reading then here you are. This is a common symptom of a blown hybrid amplifier IC caused by shorting speaker output while it's powered on. There are two protection circuits for amplifier output, Overload and DC output. In your case, most probably, DC output protection is the one that shuts down amplifier to prevent further damage. Find schematics (service manual). To confirm this, look for amplifier inputs connector, measure DC DET. signal, normally it should be around +4.85V. If right after power up it goes down to almost 0V, then it is for sure a blown output on a Hybrid IC. Check whether receiver shuts down with that cable unplugged. If not than get ready to do some rework.

There are two big Hybrid amplifier ICs, one that outputs two channels (usually front left and front right) and 3 channels (for the rest). One of the outputs (if not more) one one of them (if not both) is blown. In most of the 5.1 Pioneer receivers 2 channel IC is PAC010A and 3 channel one is PAC011A. If you want to get original parts and will find those for less then 40$ each you are lucky. There are however cheaper replacements from SANYO, those you can find for around 10-15$.

Find schematics, unsolder resistors one by one that connect AMP outputs to DC detection circuit on each IC and check which one is blown. There are 2 for 2 channel one and 3 for the other. Usually if one output is blown all others on the same IC are blown.

There could be a chance that only one channel on IC is blown, if you want to fix it you still need to replace whole IC. Also, instead of spending on new IC you may want to sacrifice one working channel (center for example) to output the blown one (so you'll get 4.1 :) ).

Nov 11, 2010 | Pioneer VSX-D710S Receiver

1 Answer

Rear speakers L and R not working


if its a 5.1 channel home theater,it means you have to hook up the subwoofer or maybe a center speaker to its terminal to have them all working. 2 front speaker,2 rear speaker and 1 center speaker or subwoofer =5 and amplifier is 1 so it is a 5.1 channel.hope this help..

May 31, 2010 | Sony STR-DB940 Receiver

1 Answer

Looking for a good amplifier


Any 2-channel (or greater) receiver or integrated amp with at least one Tape Monitor loop; or any separate amplifier - will work. I would look fror one with true > 100 watts per channel, all channels driven, 20-20000kz + a few dB, with less than 0.5% Total Harmonic Distortion (in other words clean and powerful) should suffice. Specific brands don't matter. I'm partial to old Carver amps.

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However, should you get a multi-channel amp for the 901's you will be limited to using only 901's on it as the required Active Equalizer would affect all speakers attached to the amp, and conventional speakers would not sound right and could possibly be harmed by it's drastically-altered frequency response. Since using the Tape Monitor on modern DSP Receivers disables their digital inputs, that would limit what you could listen to, should you later decide to go with Cable Box, DVD, SACD, DVD-Audio, Blu-Ray, DTS etc.

* There are no some multichannel receivers out there that allow separating the preamp-amp circuitry for each channel to allow for differences in speaker processing. I think Marantz had one.

However, having a 901-based multichannel setup myself, I would highly recommend getting the Full Monte for video listening (below)...

In that case a separate stereo amp for the 901's would work. I run a Carver AV-406 (5-channel amp) for my 901's in Front, 2 Subwoofers and the Rear Surround channel, with the Active EQ between the receiver Front L&R Outputs and the 901's amp channels. My receiver controls everything and just drives the Center and Surround speakers.

You could get by with just a stereo amp for the 901's. A Carver M-200 is a good efficient amplifier that would have you cooking just fine (2x100W). Run it with the Active EQ between the receiver Front L&R Pre-Outputs ** and the 901's amp channels.

** Front Pre Out (or one of your analog Tape Outs) >>> Bose EQ Amplifer IN, then
Bose EQ Amplier OUT >>> new amplifier IN.


Attach the 901's to the new amp, set its volume to Max and run through your receiver's speaker level setup.

Write off the Tape Out as an input if you use it to extract the Front L&R channels. DO NOT monitor it or you'll chop the 901's out of the signal path AND kill any digital source audio in the receiver.

---------

So to sum it up, I think you should start with a powerful, clean amp with few bells and whistles for the 901's and maybe later add a multichannel receiver with all the magicfor source control, DSP and to drive the other channels.




Jan 05, 2009 | Onkyo TX-DS747

1 Answer

Only 1 channel works for both the A - B selection


If only 1 channel works for A and/or B speakers, you have an amplifier failure issue and the unit needs to be repaired/replaced.

If you have audio in both channels on A, but only 1 on B - then you need to check the connection for the B channel,

Most receivers from the 1980s forward require that to use A *and* B speakers at the same time, all must be connected.

May 14, 2008 | Technics Audio & Video Receivers

1 Answer

Subwoofer: Active or non active?


Hello Smegboy,

Yes, you are right. This receiver is rated at 100WRMS output in all 5 channels (2-front, 1-center and 2-surround) while in Dolby Pro Logic operation. The subwoofer output is line level only (not amplified), which means you need a powered subwoofer to be connected to this output. A non-powered subwoofer could be used but, you need an additional amplifier connected to the subwwofer output from the receiver to drive it.
Let me know if this helps.

cancerags

Dec 29, 2007 | Technics SA-AX710

1 Answer

AV-DV75 center speaker works surround speakers do not


If all others had been fine before this problem arose, and you are sure that you haven't changed anything in your amplifier's channel selection menus, the problem might be deeper to solve! Try these out; 1-If the amplifier has a test menu to check out all channels plugged in, activate it. You must be able to get sound, which is like rustle, from each speaker. 2- Check your plugs, cables etc. be sure that there isn't any short circuit 3- Grab your amplifier's remote control and find the "channel selection menu" that allows you to increase and decrease volume levels for each speaker independently.

Apr 15, 2007 | Aiwa AV-DV75

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