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dturco
Joined: 06 Feb 2009
Posts: 3778
Location: Eastern Shore Maryland
TV/Projector: Runco DLP VX-3000i Marquee 9500 parts doner
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| Posted: Thu Jul 12, 2012 3:47 pm Post subject: NAD T-754 no audio output |
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OK a friend of mine had this in his system it died a he gave it to me.
Symptom at his house unit powered on made a "Pop" sound through the speakers no audio output.
I went over replaced it with a Onkyo TX Nr 616 all speakers worked fine.
I now have it in my home cover off, test fuses at f-751 and f-752 both test good with multimeter there is no output on the speaker lines speakers are known to be in working order.
The video output does work to a monitor, but face mounted screen does not light up.
On video out I can access the menus and have run the test for speakers, it rolls through the front r.c,l,rr,lr, no sounds at all from the built in pink noise generator.
Is it a re-boot to factory default to undo the tripped circuit?
Or is there another fuse/fusiblelink for the audio output section?
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Thu Jul 12, 2012 4:06 pm Post subject: |
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Can you hear the speaker relays latch as it starts up? Should be within 5 to 10 seconds after pressing power button.
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dturco
Joined: 06 Feb 2009
Posts: 3778
Location: Eastern Shore Maryland
TV/Projector: Runco DLP VX-3000i Marquee 9500 parts doner
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| Posted: Thu Jul 12, 2012 4:11 pm Post subject: |
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Nope, nothing, no sounds at all.
Well, maybe, there is one click when I turn, it on but I thought that was just the power?
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Last edited by dturco on Thu Jul 12, 2012 4:13 pm; edited 1 time in total
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Thu Jul 12, 2012 4:13 pm Post subject: |
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And the front screen doesn't light up at all?
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dturco
Joined: 06 Feb 2009
Posts: 3778
Location: Eastern Shore Maryland
TV/Projector: Runco DLP VX-3000i Marquee 9500 parts doner
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| Posted: Thu Jul 12, 2012 4:14 pm Post subject: |
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| macgyver655 wrote: | | And the front screen doesn't light up at all? |
correct, but that was not working for quite awhile even in my friends house, and everything else worked.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Thu Jul 12, 2012 4:16 pm Post subject: |
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Ok, got it. Give me some time to look over the prints. I'm outside today doing stuff but I'll look when taking a break.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Thu Jul 12, 2012 4:19 pm Post subject: |
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If possible can you check the preamp outs to see if there is anything there?
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dturco
Joined: 06 Feb 2009
Posts: 3778
Location: Eastern Shore Maryland
TV/Projector: Runco DLP VX-3000i Marquee 9500 parts doner
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| Posted: Thu Jul 12, 2012 4:20 pm Post subject: |
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Thank you!
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dturco
Joined: 06 Feb 2009
Posts: 3778
Location: Eastern Shore Maryland
TV/Projector: Runco DLP VX-3000i Marquee 9500 parts doner
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| Posted: Thu Jul 12, 2012 4:24 pm Post subject: |
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| macgyver655 wrote: | | If possible can you check the preamp outs to see if there is anything there? |
Yes. What setting on the Dmm should I use?
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Thu Jul 12, 2012 4:26 pm Post subject: |
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Not with DMM. Connect to another amp/receiver and see if normal sound comes out of preamps.
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dturco
Joined: 06 Feb 2009
Posts: 3778
Location: Eastern Shore Maryland
TV/Projector: Runco DLP VX-3000i Marquee 9500 parts doner
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| Posted: Thu Jul 12, 2012 4:31 pm Post subject: |
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| macgyver655 wrote: | | Not with DMM. Connect to another amp/receiver and see if normal sound comes out of preamps. |
yes. but that will take awhile. I will have to take it upstairs and "make room for it" in the theater rack, or dismantle the rack to swap it.
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Firefly rules. Can't stop the signal.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Thu Jul 12, 2012 4:33 pm Post subject: |
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You dont have another cheapy receiver laying around?  Old boom box or something? With aux or CD input or something?
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dturco
Joined: 06 Feb 2009
Posts: 3778
Location: Eastern Shore Maryland
TV/Projector: Runco DLP VX-3000i Marquee 9500 parts doner
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| Posted: Thu Jul 12, 2012 4:42 pm Post subject: |
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| macgyver655 wrote: | | You dont have another cheapy receiver laying around? Old boom box or something? With aux or CD input or something? |
Nope, three surround pre-amps, multiple DVD players, blu-ray player, walk mans, 2 radios [no aux ins] 4 TVs, 2 marquees, but no other receivers or amps other than what's in the theater.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Thu Jul 12, 2012 4:49 pm Post subject: |
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Ok. Well if you could check those preamp outs it would help with locating the problem. This receiver does have the jumper connectors on the back for 6 of the output channels, correct?
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Thu Jul 12, 2012 4:52 pm Post subject: |
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Also, how do you know when selecting speakers A/B what is on? If the display does not work is there a light?
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dturco
Joined: 06 Feb 2009
Posts: 3778
Location: Eastern Shore Maryland
TV/Projector: Runco DLP VX-3000i Marquee 9500 parts doner
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| Posted: Thu Jul 12, 2012 4:52 pm Post subject: |
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| macgyver655 wrote: | | Ok. Well if you could check those preamp outs it would help with locating the problem. This receiver does have the jumper connectors on the back for 6 of the output channels, correct? |
Yes it does. I will pull the front right channel jumper and put the out put to my Bryston and see what happens.
Ok I did the swap. I put the NAD next to my rack puled the speaker wires from the Bryston pulled the XLr's from the Bryston, put the RCA input cable to the NAD then to the Bryston, switched to single ended input on the Bryston, swapped out the speaker wires so I could use expendable speakers, and pushed test on the NAD
Nothing.
_________________
Firefly rules. Can't stop the signal.
http://www.hulu.com/firefly
Last edited by dturco on Thu Jul 12, 2012 5:02 pm; edited 1 time in total
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Thu Jul 12, 2012 4:59 pm Post subject: |
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Pull all the jumpers for the test.
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dturco
Joined: 06 Feb 2009
Posts: 3778
Location: Eastern Shore Maryland
TV/Projector: Runco DLP VX-3000i Marquee 9500 parts doner
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| Posted: Thu Jul 12, 2012 5:03 pm Post subject: |
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| macgyver655 wrote: | | Also, how do you know when selecting speakers A/B what is on? If the display does not work is there a light? |
Through the on screen menu on the monitor. And I have switched it back and forth too.
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Firefly rules. Can't stop the signal.
http://www.hulu.com/firefly
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dturco
Joined: 06 Feb 2009
Posts: 3778
Location: Eastern Shore Maryland
TV/Projector: Runco DLP VX-3000i Marquee 9500 parts doner
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| Posted: Thu Jul 12, 2012 5:04 pm Post subject: |
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| macgyver655 wrote: | | Pull all the jumpers for the test. |
OK I will remove them all and re-test.
Re-test done still no output.
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Firefly rules. Can't stop the signal.
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Thu Jul 12, 2012 5:14 pm Post subject: |
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Sounds like you have two issues in the power supply. One for the display, and from what you're saying, the preamp section has died. I've never even seen this unit, so I'm of no further help, but if there are voltages stamped on the connectors from the power supply to the rest of the unit, I'd start testing those.
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