Am I missing something, kµV?

Discussion in 'Marantz Audio' started by tbone8, May 14, 2018.

  1. tbone8

    tbone8 Active Member

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    Tuning meter on my 2252B out of the blue got out of alignment. Adjusted the lower core on the discriminator transformer and all is good now. As long as I am in there, thought I would adjust the upper core with the distortion analyzer. The manual says, "to set the signal generator to 1kµV at 98 MHz". Now, 1kµV would be 1000 microvolts, ie, 1 volt. Isn't that a tad high for this adjustment? Figured it would be 3-5µV like the other specs to do the FM alignment. Replaced the 700 board caps for good measure and wanted to note some of the polarities are backwards on the schematic...
     

     

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  2. highvoltage_

    highvoltage_ Super Member

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    A µV is 10 to the minus 6 volts, so 1kµV would be 10 to the minus 3 volts or a millivolt.
     
  3. petehall347

    petehall347 the brandy coffee man Subscriber

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    no idea what schematic you are looking at but the one i have i dont see any in backwards .. which ones are backwards on you schematic ?

    there does seem to be a chunk of the schematic missing .. between r722 and c726 ... might be how they did it . i dunno .
     
    Last edited: May 14, 2018
  4. tbone8

    tbone8 Active Member

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    Good grief, talk about a brain fart...:oops: :eek2: Definitely the dummy of the week award nominee...:eek:
     
  5. Beamer302

    Beamer302 AK Subscriber Subscriber

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    How did you type that u symbol using your keyboard ? Just what is a uV ? I see it in the alignment instructions all the time . It is also written on my Sencore SG80 . Is it a ratio or is it an actual voltage ?
     
  6. whoaru99

    whoaru99 Epic Member

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    1uV is an actual voltage, one-millionth of a volt, 0.000001V.
     

     

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  7. petehall347

    petehall347 the brandy coffee man Subscriber

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    not many multi-meters would read that .
    reminds me i must fix up one of my old school avo meters .
     
  8. whoaru99

    whoaru99 Epic Member

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    From a Windows machine, at least, it's easy using Character Map or the unicode number. Never tried to see abiut doing that on my smartphone, although holding down a key often shows alternate selections.
     
  9. tbone8

    tbone8 Active Member

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    On page 11 of the service manual, the circuit board layout C721 and C722 are backwards. Not the schematic, my bad.
     
  10. petehall347

    petehall347 the brandy coffee man Subscriber

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    schematics are most trusted thing next to how originals are on the board .. i simply put my own mark on the board if silk screen wrong . board layouts i suspect were done in a different department and possibly underpaid .
     
  11. tbone8

    tbone8 Active Member

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    I just google "micro symbol" to get that character. In my haze of getting old age, I erroneously merged millivolts (mV) and microvolts (µV). There are 1000 mV in one volt, 1000µV in one millivolt or 1V=1000mV=1000000µV. For some odd reason, the manual listed the value in kµV (one thousand µV) instead of just stating 1 mV. I knew I was figgering something off by a huge factor, just my pride is bruised now...
     

     

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  12. Beamer302

    Beamer302 AK Subscriber Subscriber

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    I have a Mac platform . it is not on the keyboard . i even tried the alt button . lots of weird ¡™£¢∞§¶•ªº but I did find the degree symbol º cool !
    No u symbol . Must be some where I will google it ....
     
  13. tbone8

    tbone8 Active Member

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    I can't recall off hand but I have come across schematics and boards being marked wrong, I think there is a page here somewhere that lists the "found" errors. I like to print the board layouts (silk screens) to highlight what I am replacing to keep everything straight. ;)
     
  14. whoaru99

    whoaru99 Epic Member

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    Try Alt + 956
     
  15. petehall347

    petehall347 the brandy coffee man Subscriber

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    i do it the long way and one at a time ... would end up with spares otherwise
     
  16. Beamer302

    Beamer302 AK Subscriber Subscriber

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    On a Mac one has to press Control ,command and space bar .. a font window opens up and the rest of the world of stuff is there . I will try the micro symbol now...
    µµµ ...Hey it worked ! It is under the heading "letter like symbols." Happy typing . !
     

     

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  17. catrafter

    catrafter Marantz Specialist Subscriber

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    On my PC, I hold the ALT key down and type the numbers 230 on the keypad.
    µ

    ALT 234 yields Ω
    Tom
     
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