Pioneer sx 1010 - Tuner AM and FM is MUTE

Discussion in 'Pioneer Audio' started by havols, Sep 18, 2017.

  1. havols

    havols Active Member

    Messages:
    204
    Location:
    Manaus, Brazil
    Hi Zebulon
    Finally, i got some time to finish the job on my pioneer Sx 1010.
    Everything working perfectly. I just need to work on the Power Amp Assembly.
    I can't find transistor SA992 to replace 2sa726. I'm looking for BC 560 but not found yet.
    I also did not find the SC3503 to replace the SC1451.

    Would you have other suggestions for transistors to replace 2sa726 and 2SC1451? It could be some overkill.

    Could I use the 2SC2690A as a replacement for the 2SC1451?

    Thank you very much.
     

     

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  2. native

    native Member

    Messages:
    61
    Location:
    Austin
    Would you like me to mail you the parts you need?
     
  3. havols

    havols Active Member

    Messages:
    204
    Location:
    Manaus, Brazil
    Hi
    Thank you all
    I ventured, and used the 2sc2690 transistor as a replacement for 2sc1451. I could not find another alternative. I also installed the BC560 like substitute the 2sa726, because it was my only option.
    After making these changes, I've used the SX 1010 for about 10 hours, and so far it's sounding good, and working properly.

    FM, AUX and PHONO are OK.

    The only problem I still have is the function indicator lamps (AUX, PHONO, FM, AM, MIC) and MONO, LOUDNESS ... that are not power on. None of them light up.
    Looking at the schematic, it occurred to me that it might be a problem on the 1s1885 diodes, like the D1 or D2 on the AWS-068-0 board.

    Could someone help me with this?
    Thank you very much
    Havols
     
  4. Watthour

    Watthour Electron Rancher - JS3600

    Check the voltages at Pins 2 and 5 on the AWS-068 board. It should be 4-5 VDC.
     
  5. havols

    havols Active Member

    Messages:
    204
    Location:
    Manaus, Brazil
    Thanks watthour
    I will do. Post results here in next days.
    Regards
     

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