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Pioneer SA-505 clicking

Discussion in 'Audio' started by tooter, Feb 17, 2018.

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  1. tooter

    tooter

    36
    1
    Feb 17, 2018
    Hi thanks for the reply I have pressed the relay down and it did pass sound through ok. I have a full service manual.
    https://www.dropbox.com/preview/Shared/hfe_pioneer_sa-540_service_arp-304-0_en.pdf?role=personal
     
  2. duke37

    duke37

    5,364
    769
    Jan 9, 2011
    I am not logging on to look at your pretty picture, I have had enough trouble with funny thing hapening.
    Put the schematic as an attachment here.
     
    Tha fios agaibh and (*steve*) like this.
  3. tooter

    tooter

    36
    1
    Feb 17, 2018
    It won't let me attach as the file is to large.
     
  4. tooter

    tooter

    36
    1
    Feb 17, 2018
  5. Tha fios agaibh

    Tha fios agaibh

    2,097
    707
    Aug 11, 2014
    So crop it, resize it, or lower the resolution in just about any photo editor.
     
  6. 73's de Edd

    73's de Edd

    2,888
    1,224
    Aug 21, 2015
    Sir tooter . . . . .

    One lead of your RY1 / ASR107 relay, that you just had pulled, has one coil connection going to the collector of its Q405 driver transistor, while its other end coil end should go to R414 which is a 820 1 watt resistor.
    So, using the emitter of Q405 as your metering ground referencing, measure on both sides of that R414 and if you were reading 6VDC at the relay what voltage do you read on the OTHER supply side of the R414 ?
    Would be expecting a max of about 34VDC or a min of 29 VDC from the power supply..

    73's de Edd
    .....
     
  7. tooter

    tooter

    36
    1
    Feb 17, 2018
    OK pics added. Thanks.
     
  8. tooter

    tooter

    36
    1
    Feb 17, 2018
    Screenshot_20180222-134912.png Screenshot_20180222-134750.png
    Thanks.
     
    Tha fios agaibh likes this.
  9. tooter

    tooter

    36
    1
    Feb 17, 2018
    Hi thanks for the answer after testing bothe ends of the R414 i get 6v from the end nearest the coil and between 11-12 from the other end.
     
  10. duke37

    duke37

    5,364
    769
    Jan 9, 2011
    Measure the voltage between TP1 and TP2 (Left) also TP3 and TP4 (Right).This is a measure of the current through the output transistors. The correct voltage should be found in the details, excess voltage, hence current, will stop the relay actuating (I think).
     
  11. tooter

    tooter

    36
    1
    Feb 17, 2018
    Hi both show 1.3 mv
     
  12. tooter

    tooter

    36
    1
    Feb 17, 2018
    That is within the threshold of .23mv and 23mv.
     
  13. tooter

    tooter

    36
    1
    Feb 17, 2018
    Screenshot_20180222-202008.png
     
  14. duke37

    duke37

    5,364
    769
    Jan 9, 2011
    I think you mean that it is the acceptable range. There is no threshold.
    It looks as if the positive and negative power supply and the output transistors are working properly. This is confirmed by sound output when the relay is pushed in.
     
  15. 73's de Edd

    73's de Edd

    2,888
    1,224
    Aug 21, 2015
    Sir tooter . . . . .

    Here is a condensing of the whole schematic to only your particular areas of interest.
    Initially find your relay that was tested and then follow the yellow brick road . . . . . .errr . . . . RED arrow path, back to its dedicated power supply source.

    Apply the AC power to the unit with the POWER switch .
    We want the DC reading there across the + to - of the YELLOW boxed C206 supply capacitor and then switch to DVM metering function to AC mode and see what the AC ripple level is being there also.

    Replace C206 and expect the unit to now power up the speakers.

    Then re take those DC and AC ripple readings with the new capacitor.

    Feed back your findings . . . . .

    MINI-SCHEMATIC REFERENCE . . . . .

    [​IMG]
    https://image.ibb.co/mFGWLx/Pioneer_SA_505.png

    73's de Edd
    .....
     
  16. duke37

    duke37

    5,364
    769
    Jan 9, 2011
    The circuit should turn on the output when it has settled to its working condition which is close to zero relative to the chassis.
    Measure voltage between TP2 and chassis (left), also TP3 and chassis (right).
     
  17. tooter

    tooter

    36
    1
    Feb 17, 2018
     
  18. tooter

    tooter

    36
    1
    Feb 17, 2018
    hi the reading across TP2 & TP3 is 9.9mv
     
  19. duke37

    duke37

    5,364
    769
    Jan 9, 2011
    I did not ask for the reading across TP2 and TP3.
     
  20. tooter

    tooter

    36
    1
    Feb 17, 2018
    Sorry miss read the post will re take the reading ASAP.
     
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