Problem solved
i have the same problem with my A1000 center died
problem is the magnetichal relay who has the contacts oxidated
clen thoes and ull have it like new
Testimonial: "Thank you very much. Your diagnostic was totally right and cleaning the relay fixed my problem. Thanks again - very helpful!"
Can you describe what you refer to as the "magnetichal relay"? What is that and where do I find it so that I can clean it?
Thanks a lot for your help!
well there are 2 litlle relay black on the main bord in the midle of it betoween 2 big heat cooling radiator
it have on it 2 little magnets fixed with tape
the center relay is clouse to the suround module
if u wana talk true messenger let me know i can help u true the proces of fixing ur am
I could definitely use some help. I opened the amplifier, found the 2 relays - not sure though which one is related to the center channel as I don't know what the surround module is. And I've got no clue how I would clean these up - do I need to remove them from the board (how) and then what? Or I don't remove them to clean them up...???
Actually, as I'm sure you know, there are 4 relays on the main board. 2 are spread apart, at the center of the amplifier, and 2 others are close to each other, closer to the front of the amplifier. There seems to be a way to open the relay "box" by pressing on 2 little notches although I've not managed to open any so far (not tried very hard so far - I wanted to make sure I was doing the right thing first). I've read some data about how to clean them but first steps consist in identifying the right relay, then opening it and see what there is there. (I could also open both of them and see what I would end up with). I've read they could be cleaned with some sand paper. I also have some liquid contact cleaner that I used some time ago to clean the input selector (I eventually had to buy a new one, unsolder it from its board and reinstalled it).
put a webcam give me ur id of mesenger and ill help u true the proces
I managed to remove the covers from the two middle relays and applying data from some Internet forum, I "cleaned" them with some very fine sand paper and everything is now back to normal.
Thank you very much!
i told u
glad i could help u
good luck
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If you run through the setup and certify it knows about the center channel first, then test it with tiones, then maybe swap the center speaker with another one you might come to an answer.
Testimonial: "Thank you for your help. Your input helped me understand what the problem could be!"
I understand what you recommend; sorry for not being clearer in my original question. What you must know:
1) I lost the center channel while watching TV with the sound coming from the Yamaha. Suddenly, the voice level became much lower than it was just before. At that moment, I compensated this issue with the TV volume that I un-muted and I looked into the problem later on. This is when I discovered that the only sound I had was coming from the main speakers and the 4 surrond speakers (I have a full 7.1 setup). I still had sound but because the center channel was no longer working, the sound level was much lower (I was then using one of the TV processing field 9-12). When using any of the first 8 sound processing fields, the problem would disappear but in these fields, the center channel is probably not even used. But in the 9-12 fields, those for watching TV, the center play a central role, as you probably know, and this is when the lack of center channel was becoming very obvious.
2) I made sure it wasn't a speaker issue: I replaced the center channel with one of the main speakers - still no sound from the new center speaker, and I tried the center speaker as main speaker and the speaker was then working. So, I know for sure I don't have a speaker issue.
The only way right now to use the Yamaha to watch TV is to have the center channel set to Phantom, which basically uses the 2 main speakers as "center" channel¸ as I'm sure you know.
Thus my question: what could cause this behaviour and how can it be corrected? My only description right now is there is no sound going to the main speaker, regardless of the DSP sound field selected.
Thanks for your help.
Last statement should read "My only description right now is there is no sound going to the center" speaker, regardless of the DSP sound field selected. Thanks for your help.
It's still not clear if center test tone works or if ONLY TV is affected. Even analog 2-channel music will have substantial center channel audio. when using DSP's.
Unfortunately I can't find a manual to follow along with the numbered DSP modes.
I see it has two center outputs. BOTH dead? There's a switch back there. Diddle with it. What are those Coupler things?
I'm using this photo set for reference.
http://www.canuckaudiomart.com/view_imag...
I still haven't found a manual but the A-1092 is similar in some respects and gives me some basic ideas.
Do YOU have the DSP-A1000 manual for your own reference?
I'm going to just throw some stuff out to see what sticks.
Have you eliminated the Center speaker as the issue by swapping in a different one or placing it on a different amplifier channel?
We don't know if the Center Channel preamp is even creating the required signal level or if it's getting lost in the Center Channel amp.
You could use test tones and some creative manipulation of the available pre-out jumpers to redirect the Center to another channel using RCA patch cables. THEN we will know if it's simply a dumb amplifier problem or if the Center is getting limited in the preamp area.
When you run the speaker tests what Center Mode are you using? Normal, Wide, Phantom - Experiment with it.
I would recommend setting the Test Tone outputs with the Front Channels at 0 dB (stake in the ground) and try to get the other channels to match THEM.
Main Channel has a -10dB switch. Try that to see if the Center and Front can achieve parity.
My $.02: I disagree with your previous assessment that DSP Modes 1 - 8 are, being for music, primarily drive the Front L & R channels. I don't have a Yamaha but I never use just stereo for music since I acquired DSP and surrounded myself with full-range speakers. In the few modes I have there is always something of sonic interest on every speaker and the optimium 'mode' can change from one song to the next. OTOH I, since all my hi-fi (non-TV-speaker) video enjoyment originates in 5.1 I never mess with that by throwing DSP modes at it.
Phantom Mode completely bypasses the center channel and probably exercises the relay which the other expert mentioned.
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Actually, by doing more tests recently, I found out the center channel is not completely dead (things may have changed since I opened this problem) - it is now just very low.
When I run the tests to level the Main speakers with the Center and Rear speakers, I have to set the Center channel to +10 DB and I still don't get it to the same level as the main speakers. With center set to +10DB, I manage to get the center channel to roughly 50% of the main speakers volume. So, for the time being, Phantom mode is still my only option.
The couplers you see are described as follows in the Yamaha guide:
Main out jacks: Main-channel line output. Connected with jumper bars to MAIN IN jacks when the built-in amplifier is used. Connected to input jacks of external stereo power amplifier (MAIN IN or TAPE PLAY jacks of integrated amplifier or receiver) otherwise.
Main in jacks: Line input to built-in main-channel amplifier. Connected with jumper bars to MAIN OUT jacks when the built-in amplifier is used. Not connected when using an external power amplifier.
Center Out Jacks: Center channel line outputs. Not connected when the built-in amplifier is used. Can be conneted to input jack(s) of one or two external power amplifiers to drive the center speaker(s)
Center-in Jacks: Line input to built-in center-channel amplifier. Connected with jumper bars to CENTER OUT jack when the built-in amplifier is used. Not connected when using an external power amplifier.
My system is currently set to use the internal amplifier only (jumper bars are used for Main out Jacks, Main in Jacks as well as Center in Jacks. I've played with those to make sure it was not a contact issue or a broken jumper bar.
DSP Fields 1-8 are for music (sound mainly comes from the main speakers - all other speakers are for effects; 9-12 are for watching TV (sound mainly comes from the Center channel - all other speakers would be for effect). I've played with the A-B switch for the Center channel and have tried channel B instead of A and I get the same results.
At first, I believe I was not getting any sound from the Center channel. I now get low-volume sound. May be related to Solution 2 described on this site (I'm not sure however what is described as a dirty countact. But could using the system in Phantom mode for some time now made the issue somewhat disappear. A contact isssue could explain why things have somewhat changed, apparently, over the past weeks.
HI,
Yes I have the DSP-A1000 user manuel.
Yes, the center speaker has been eliminated as the source of the problem by swapping it.
In Normal mode, I get a low volume now from the Center Channel, either using the Amp normally or using the test tones to level the different speakers.
In Phantom mode, center volume is normal. The problem disappears as soon as I switch to the Phantom Mode. This is what I've been using since "losing" the Center speaker.
What I mean about the different speakers in DSP fields 1-8 VS 9-12 is that with fields 1-8 (which are clearly defined for music), the speakers that output the higher volumes are the two main speakers; all other speakers seem to be used to create the sound fields. In DSP mode 9-12, which by their names are clearly defined for TV, when everything works normally, the Center speaker is the speaker with the highest volume - the others, including the main speakers, have lower volumes, there again, apparently being used to create the sound field (this is my interpretation).
As you suggest, I could play with RCA patch cables to see what I get from different scenarios. I may do this soon - for the time being, I'm going to try playing with the Relays if I can figure out which one to try to fix and how to fix (clean) it. I've had to clean other contacts with this AMP over time, which tends to tell me the relay possibly could be the actual problem. For instance, I had to regularly clean the input selector until I got tired and bought a new one; I had to unsolder the old selector from its little board and resolder the new one. I managed to do it and I haven't had any issue since with the input selector.
I'm also thinking about replacing this almost 20-years old amp with something new but I don't know at this point what type of Amp would provide similar quality, although this old amp is completely analog compared to fully digital solutions today. I'd need to do some research on this front. But I must say I don't dislike this Amp.
Problem has been solved - see solution 2. Problem was the DEC DH2TU 24VDC relay. Cleaning the contacts with very fine sand paper fixed the issue.
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