Pioneer Spec 2 Issue

Discussion in 'Pioneer Audio' started by xXColdShotXx, Dec 30, 2018.

  1. xXColdShotXx

    xXColdShotXx Active Member

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    rcs16, thanks for the part #'s. Will I have to modify the boards any like drill the holes out?
     

     

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  2. rcs16

    rcs16 Super Member

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    I am not sure, I made my holes 55 mil in the AWR-154 pcb re-design. You are correct they might be a very tight fit or need a drill mod to work. The part spec says to use 1.4mm finished hole. What are the hole sizes did they used?, I did not measure them on the original AWR-154, which I gave back to the owner, so I can not measure them now. If they are 25mil square posts then the hypotenuse is 35mil, so they might have gone as high as 40-45 mil ( 1-1.1mm)
     
  3. xXColdShotXx

    xXColdShotXx Active Member

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    Location:
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    The posts in the AWH-045 board I want to get rid of measure 1.16mm.
     
  4. xXColdShotXx

    xXColdShotXx Active Member

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    Location:
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    I checked all the solder joints with ones nearest to them on the same copper trace and they all seem fine. They tested right around 1Ω.
     
  5. xXColdShotXx

    xXColdShotXx Active Member

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    265
    Location:
    Lexington, Kentucky
    Anyone know what kind of reed relay is used on this AWH-045 board I found on the bay? The board looks like the same revision as the ones I'm working on at the moment.
     

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  6. xXColdShotXx

    xXColdShotXx Active Member

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    Location:
    Lexington, Kentucky
    I (think) finally found my problem. I used one 512-1N5247B diode, and (think) I'm supposed to use 2 512-1N5247B diodes in series to get the 34v 1w the board needs.
     

     

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  7. xXColdShotXx

    xXColdShotXx Active Member

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    I was reading markthefixer's post here where he said this "D2 is a 34V 1W zener, and I use a series'd
    pair of 17V 500mW zeners to replace, since a 34V 1W zener is an oddball"

    I am glad I was reading that thread and realized my mistake. I am going to take the one out and add another to it in series and test it again.

    It is a good thing to read all the threads a person can find about whatever it is a person is working on, never know you may find something in one of the threads that helps you figure something out.
     
  8. xXColdShotXx

    xXColdShotXx Active Member

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    265
    Location:
    Lexington, Kentucky
    I put 2 diodes in series and that fixed the mv issue on the right AWH-045 board.
     
  9. xXColdShotXx

    xXColdShotXx Active Member

    Messages:
    265
    Location:
    Lexington, Kentucky
    Now I gotta rebuild the left AWH-045 board, put the 2 relays on the AWR-093 board and rebuild the AWM-081 board. I am getting around 29.5mv on both board from pin 13 and 26. When I test the speakers terminals in DC mV, left has around -28mv and right has -1 or -2mv.
     
    Last edited: Jan 4, 2019
  10. zebulon1

    zebulon1 Building a new bench. Finally! Subscriber

    Messages:
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    Great!
    And you are getting good at searching for answers.
    Knowing the right search words goes a long way to getting the answers.
    One key word: Audiokarma
     
  11. xXColdShotXx

    xXColdShotXx Active Member

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    zebulon1, you think this oscilloscope would be ok for working on vintage audio equipment?
     

     

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  12. zebulon1

    zebulon1 Building a new bench. Finally! Subscriber

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    I don't like it. Leader has some good equipment but this is too questionable and expensive.
    Too far a drive for this scope?
    It works and comes with a probe.
    The seller might give you a quick lesson as well.
    See what else he has? Maybe some nice door prizes ;)

    Still need a dummy load.
     
  13. xXColdShotXx

    xXColdShotXx Active Member

    Messages:
    265
    Location:
    Lexington, Kentucky
    Anything I can use to get scratches off the Spec 2 faceplate and knobs? I used a magic eraser to clean it, but I'd like to get the scratches off if possible.
     
  14. xXColdShotXx

    xXColdShotXx Active Member

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    265
    Location:
    Lexington, Kentucky
    I don't know of any other site quite like AK. I've gotten a lot of info from this site that has helped me fix some stuff I'd never gotten fixed by local techs.
     
  15. xXColdShotXx

    xXColdShotXx Active Member

    Messages:
    265
    Location:
    Lexington, Kentucky
    Just got the left AWH-045 rebuilt. I'll test it tomorrow and put the results on here afterwards.
     
  16. xXColdShotXx

    xXColdShotXx Active Member

    Messages:
    265
    Location:
    Lexington, Kentucky
    Got the spec 2 playing with 30mv on both left and right AWH-045 VR1's. VR2's and VR3's on both boards are turned all the way down. It sounds good and it's not even adjusted for 4Ω/8Ω loads or input sensitivity. I still need to rebuild the meter board also, may do that later today/tonight.
     

     

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  17. zebulon1

    zebulon1 Building a new bench. Finally! Subscriber

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    Good
    Like I said the limiters if not messed with should be close. I should of made notes on the adjustments. A guy could just move them up out of the way and run at his own risk.
    I guess you could look at the circuit and figure it out.
     
  18. xXColdShotXx

    xXColdShotXx Active Member

    Messages:
    265
    Location:
    Lexington, Kentucky
    I changed all the VR1's, VR2's and VR3's on the AWH-045 boards., I just turned them all the way down except the VR1's on both boards. It sounds pretty damn good the way it is. I can imagine it'll sound even better once it's tuned to spec.
     
  19. zebulon1

    zebulon1 Building a new bench. Finally! Subscriber

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    The limit pots/circuit protect the amp by knocking the output down when the amp reaches near its limit. It has nothing to do with dynamics.
    Although:
    If it/they were set to low the amp would clip early and cause distortion. That would cause some dynamic issues.
     
    Last edited: Jan 8, 2019
  20. xXColdShotXx

    xXColdShotXx Active Member

    Messages:
    265
    Location:
    Lexington, Kentucky
    I haven't been getting crazy with it, just around 10/50 watt on the meters, if the meters are accurate. I haven't rebuilt the meter board yet.
     

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