What did I do now?

cambir
cambir Posts: 1,045
edited January 2010 in 2 Channel Audio
I'm sure I did something really stupid and am going to regret it, but please help!

Pioneer SX-727 receiver...removed main in/pre out jumpers for the first time yesterday to plug in and test an amp...amp worked great, so unplugged it and replaced jumpers...now the Pioneer will only produce sound out of the right side unless I select mono.

What did I do? How did I lose the left side and how do I get it back?

Please help...I like the sound of my left speakers too!
Post edited by cambir on
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  • danger boy
    danger boy Posts: 15,722
    edited January 2010
    on an old receiver like that.. a wire could have come broke from the pre amp output.. open her up and see if you see anything obvious like that.
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  • cambir
    cambir Posts: 1,045
    edited January 2010
    danger boy wrote: »
    on an old receiver like that.. a wire could have come broke from the pre amp output.. open her up and see if you see anything obvious like that.

    would that kill the output just in stereo and allow mono to work?
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  • BlueFox
    BlueFox Posts: 15,251
    edited January 2010
    Was the power off when you did all this? If not you might have toasted something. Google and try to find a schematic for the Pioneer, and see if there is a fuse for each channel. Maybe you will get lucky. Did you try reinserting the jumpers to make sure there is not a poor connection issue?
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  • cambir
    cambir Posts: 1,045
    edited January 2010
    BlueFox wrote: »
    Was the power off when you did all this? If not you might have toasted something. Google and try to find a schematic for the Pioneer, and see if there is a fuse for each channel. Maybe you will get lucky. Did you try reinserting the jumpers to make sure there is not a poor connection issue?

    yes, power was off (amp and receiver) when connecting everything...wanted to try not to toast anything. I have also tried removing/reinserting the jumbers...no luck. Will search for a schematic.
    Thanks.
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  • kcoc321
    kcoc321 Posts: 1,788
    edited January 2010
    Maybe try some DeOX in the switch?
    Also you say it only ouputs to the left channel when switched to Mono?? Do you get any DMM reading on the left channel while in 'stereo' switch position?
    I take it it played (left) while connected to the external amp, Does it still play the left channel now?
    (if it still plays left channel on external amp, then it at least tell yo the problem is in the internal amp)
    Ditto on opening it up and checking all the connections...
    Also, what kindof connection does it use? If rca, try some cables vs the stock jumpers???IDK, just a thought....

    BTW: make sure you drain the caps before sticking your hand in there and follow Rich's recommendation and only stick one hand in there at a time (keeps from your body becoming the 'circuit')

    sucks dude, :(
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  • cambir
    cambir Posts: 1,045
    edited January 2010
    kcoc321 wrote: »
    Maybe try some DeOX in the switch?
    Also you say it only ouputs to the left channel when switched to Mono?? Do you get any DMM reading on the left channel while in 'stereo' switch position?
    I take it it played (left) while connected to the external amp, Does it still play the left channel now?
    Ditto on opening it up and checking all the connections...
    Also, what kindof connection does it use? If rca, try some cables vs the stock jumpers???IDK, just a thought....
    :(

    Shouldn't need Deoxit...cleaned it all up with some a while back. All switches work fine, just no sound on the left unless I switch to mono.

    Don't know what DMM reading is?

    Played through the left when I had the amp hooked up...only had the left speaker connected. Don't have the amp connected now and don't really want to try again now...I might end up losing the other channel.
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  • cambir
    cambir Posts: 1,045
    edited January 2010
    Found the service manual with schematics online...now I just need to figure out how to read it!
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  • kcoc321
    kcoc321 Posts: 1,788
    edited January 2010
    DMM = digital multimeter

    and as far as trouble shooting, IDK how else you can isolate the issue unless you hook it up some way, or else take it to a shop, but they are going to hook it up in trying to figure the problem also.

    I'm still up (dah) you can call me if you want. I don't want to wake the kids....
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  • cambir
    cambir Posts: 1,045
    edited January 2010
    kcoc321 wrote: »
    DMM = digital multimeter

    and as far as trouble shooting, IDK how else you can isolate the issue unless you hook it up some way, or else take it to a shop, but they are going to hook it up in trying to figure the problem also.

    I'm still up (dah) you can call me if you want. I don't want to wake the kids....

    Don't have one of those (DMM).

    Yeah, I know I'll have to troubleshoot. Will have to be another time, though.
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  • F1nut
    F1nut Posts: 50,565
    edited January 2010
    to plug in and test an amp...amp worked great

    You sure? How old is the amp? When was the last time it was used?
    Played through the left when I had the amp hooked up...only had the left speaker connected.

    From what you describe, it seems that the amp took out the left channel of your receiver. If you're lucky, it's just a blown fuse, so take a look.
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  • cambir
    cambir Posts: 1,045
    edited January 2010
    F1nut wrote: »
    You sure? How old is the amp? When was the last time it was used?



    From what you describe, it seems that the amp took out the left channel of your receiver. If you're lucky, it's just a blown fuse, so take a look.

    The amp is the ESS from the 70s I posted about in another thread...guy said he had been using it just recently. Maybe not?

    Agreed, I think the amp did it...
    It would be a blown fuse inside the case, not the main fuse on the rear panel, correct? Would a blown fuse destroy stereo output yet still allow mono?
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  • F1nut
    F1nut Posts: 50,565
    edited January 2010
    cambir wrote: »
    The amp is the ESS from the 70s I posted about in another thread...guy said he had been using it just recently. Maybe not?

    I'd bet on maybe not.
    Agreed, I think the amp did it...
    It would be a blown fuse inside the case, not the main fuse on the rear panel, correct?

    The fuse on the back, if blown, would kill the whole thing. There are usually additional fuses inside.
    Would a blown fuse destroy stereo output yet still allow mono?

    It's possible.
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

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  • kcoc321
    kcoc321 Posts: 1,788
    edited January 2010
    link to the schematic would be helpful.
    Can you take the amp back?
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  • reeltrouble1
    reeltrouble1 Posts: 9,312
    edited January 2010
    I know it looks dark at the moment so check for the fuse............if not, well, its still good in the end, you either get it fixed or get a new one.......you still get something, albiet after the initial kick in the panties, dont let em get twisted though, that hurts.

    RT1
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  • cambir
    cambir Posts: 1,045
    edited January 2010
    OK. Stupid question of the day. Do the fuses inside look like normal fuses? Got this thing opened up, but I don't see any fuses. Do I need to take the bottom panel off too?

    Any ideas?
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  • cambir
    cambir Posts: 1,045
    edited January 2010
    reeltrouble1 wrote: »
    after the initial kick in the panties, dont let em get twisted though, that hurts.
    RT1

    experience or speculation? wait, nevermind...I don't want to know. :eek:
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  • cambir
    cambir Posts: 1,045
    edited January 2010
    kcoc321 wrote: »
    link to the schematic would be helpful.
    Can you take the amp back?

    got the schematic on hifi engine...I can send via email attachment.
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  • cambir
    cambir Posts: 1,045
    edited January 2010
    kcoc321 wrote: »
    Does it still play the left channel now?
    (if it still plays left channel on external amp, then it at least tell yo the problem is in the internal amp)

    hooked it back up with the amp exactly how I had it the other day...no left channel output through the amp.

    actually, what I found today is that if I hook a speaker up to the left channel on the Pioneer, I can can get extremely muted sound when I turn the volume up over the half-way mark. same happened through the amp.
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  • cambir
    cambir Posts: 1,045
    edited January 2010
    not looking good for the Pioneer...:(

    http://forum.ecoustics.com/bbs/messages/1/51433.html
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  • kcoc321
    kcoc321 Posts: 1,788
    edited January 2010
    At first it does sound kindof bleak, but As I read it, whe the OP (over there) turned up his left channel only, he got distortion and hissing ect. Is your doing that?

    re: Fuses, the ones I have seen look like the ceramic fuses, ie white cylinder, with metal caps that taper down to wire leads that are soldered onto the board.

    "I think" the only way to test them is with a continuity tester, usually on a DMM, again.
    You can borrow mine if you want.
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  • tonyb
    tonyb Posts: 32,967
    edited January 2010
    What you did...is give yourself a damn good excuse to get a new receiver.
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  • reeltrouble1
    reeltrouble1 Posts: 9,312
    edited January 2010
    tonyb wrote: »
    What you did...is give yourself a damn good excuse to get a new receiver.

    see good news..........we have all been there, if you aint busted something you aint done nothing in audio.

    RT1
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  • cambir
    cambir Posts: 1,045
    edited January 2010
    tonyb wrote: »
    What you did...is give yourself a damn good excuse to get a new receiver.

    Needed that laugh...thanks. I think I have another receiver around, but I haven't found anything like the vintage Pioneer / vintage Polk combo...I'd hate to lose this one.
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  • starkiller
    starkiller Posts: 2,723
    edited January 2010
    was that the ESS on craigslist??
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  • Polkersince85
    Polkersince85 Posts: 2,883
    edited January 2010
    Those receivers had dual pots on the volume and balance knobs for R and L control. Are you sure that the lines on the knobs are centered? Usually the right channel is the outside and left is inside.
    >
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    >This message has been scanned by the NSA and found to be free of harmful intent.<
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  • cambir
    cambir Posts: 1,045
    edited January 2010
    starkiller wrote: »
    was that the ESS on craigslist??

    yes it was
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  • cambir
    cambir Posts: 1,045
    edited January 2010
    Polkersince85 wrote: »
    Those receivers had dual pots on the volume and balance knobs for R and L control. Are you sure that the lines on the knobs are centered? Usually the right channel is the outside and left is inside.

    This model only has dual pots on the bass and treble knobs.
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