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Pioneer SX-950 wont come out of protection

Discussion in 'Pioneer Audio' started by CavScout, Jul 2, 2018.

  1. 1MEGΩ

    1MEGΩ Active Member

    Messages:
    216
    Location:
    Mamou, Louisiana
    The numbers you show in this photo are normal. .5xx to .6xx and some can be .4xx

    15415547654151558066796046245830.jpg
     

     

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  2. petehall347

    petehall347 the brandy coffee man Subscriber

    Messages:
    27,886
    Location:
    uk.. the middle bit
    2sc1628 appears shorted C to E
     
  3. CavScout

    CavScout Well-Known Member

    Messages:
    566
    That reading was in fact 0.00

    Consensus ?

    Is that shorted ?
     
  4. Watthour

    Watthour Electron Rancher - JS3600

    If tested on a 4000 terra-ohm scale, it might be a question. However, if tested on a diode/junction test scale, it's very likely shorted.
     
  5. petehall347

    petehall347 the brandy coffee man Subscriber

    Messages:
    27,886
    Location:
    uk.. the middle bit
    try with your meter set on 200 ohm scale .
     
  6. CavScout

    CavScout Well-Known Member

    Messages:
    566
    I am using a fluke 101 which has an automatic feature.
    Is that accurate to the point that would indicate those transistors are shorted ?
     

     

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  7. Watthour

    Watthour Electron Rancher - JS3600

    It appears that the 101 does not include any feature which allows the range to be locked in or selected, with full-time auto-anging only. That can make it a little tricky to get very finite measurements sometimes.
     
  8. 1MEGΩ

    1MEGΩ Active Member

    Messages:
    216
    Location:
    Mamou, Louisiana
    Just select Ω and do not press the yellow button for diode test. Give us the reading again across the emitter and the collector.
     
  9. CavScout

    CavScout Well-Known Member

    Messages:
    566
    For Q7 across E C reads .3 ohms

    For Q1 across E C reads O.L
    For Q3 across E C reads O.L

    in fact, no activity at all on the ohm setting for Q1 and Q3 for any of the leads
     
  10. rcs16

    rcs16 Super Member

    Messages:
    3,953
    Location:
    Baldwin, Ontario, Canada
    sounds like Q7 is toasted, always measure device leads switching probe polarities to test semiconductor junctions
    Try the diode function to measure known good parts so you can get familiar with your DMM
     
  11. CavScout

    CavScout Well-Known Member

    Messages:
    566
    If Q7 Is bad does mouser.ca sell an equivalent? I tried searching that part number and it did not come up ?
     

     

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  12. petehall347

    petehall347 the brandy coffee man Subscriber

    Messages:
    27,886
    Location:
    uk.. the middle bit
    original 2sc1628

    sub .. KSC3503estu
     
  13. rcs16

    rcs16 Super Member

    Messages:
    3,953
    Location:
    Baldwin, Ontario, Canada
    watch out for the pinout
    2sc1628 is EBC
    KSC3503 is ECB
     
  14. CavScout

    CavScout Well-Known Member

    Messages:
    566
    When I search that part number it gives me a few options. Not sure which on to choose
     
  15. Watthour

    Watthour Electron Rancher - JS3600

    Look at the specs for a KSC2690AY. Add a 6043BG heat sink and it should outperform the 2SC1628. Pinout is still different, however.
     
  16. 1MEGΩ

    1MEGΩ Active Member

    Messages:
    216
    Location:
    Mamou, Louisiana
    Watthour is correct. When searching Mouser, it's best to put the Mouser part number in the search bar.
    This is the transistor you need to order from Mouser. 512-KSC3503DSTU
    The 512-KSC3503ESTU is obsolete.
    512-KSC2690DSTU transistor
    532-6043BG heat sink
     
    Last edited: Nov 12, 2018 at 6:08 PM

     

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  17. CavScout

    CavScout Well-Known Member

    Messages:
    566
    Thanks , will do
     

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