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  1. 73's de Edd

    Reparing dead Sansui TDC2075A

    Sir MobiusOne . . . . . ( Now . . . . let's just see if we can get you all caught up in a Mobius Loop. ) With what I can JUST see / fathom from that supplied photo. The NON blowing of that fuse is GOOD. Its power supply circuitry may have just got "weak and lazy" from time of use. If being...
  2. 73's de Edd

    Pioneer S-W700 Subwoofer

    GREEEEEEEEEEEEAT . . . . .(a la Tony The Tiger) Now . . .that all is well . . . . go fer the install of the already known good E cap in the negative supply .
  3. 73's de Edd

    Pioneer S-W700 Subwoofer

    Did the Red probe on 1+ . . . . . . . . But it looks like that you didn't do the BLACK probe on pin 1 . . . TO THEN . . . . .do that sequence of testing, to be able to get the two "A" and "C" diodes "500 'ish millivolts readings " + plus the series diodes . . . . .~ 1 volt 'ish reading...
  4. 73's de Edd

    Pioneer S-W700 Subwoofer

    Sir coastman49 . . . . GOOD SHOW ! . . . . .Lo o o o o o o king Go o o o o o o o d . . . . . . now, with maybe no expense of the purchase of another FWB. Comparing the schematic snippet to the internal FWB component equivalency, we can see that you tested internal diodes "B" and "D" and...
  5. 73's de Edd

    Pioneer S-W700 Subwoofer

    This also drops out the bottom 10% so I am still correcting . . .s l o w l y .
  6. 73's de Edd

    what mosfet to use for an induction heater

    Get one that is not effected by field radiation. Some new transistors are designed to fire when a field is a certain strength. roughshawd . . . . . . . You do be one . . . . . " wild and CRAZY guy " . . . . . with uber emphasis being placed on the CRAZY aspect.
  7. 73's de Edd

    Pioneer S-W700 Subwoofer

    Sir coastman49 . . . . . Ok I have the Service manual. I can send you copies. What page? I am missing the VERY bottom 10% of the page which contains the two AUDIO OUTPUT AMPLIFIER STAGES FLAG MARKINGS OF PROTECT AND TEMP are centered within that crossing cluster of circuitry's hoz connecting...
  8. 73's de Edd

    Mig welder wire speed controller problem

    Sir Pmax . . . . . I was just looking at the inherent circuit design, and with it mostly being resistors . . .inherently stable and reliable components . . and that one E-cap. With it being in a time constant circuit and any decline, inherently decreasing the on time drive to the SCR's . Less...
  9. 73's de Edd

    what mosfet to use for an induction heater

    Not only is a 2N7000 MOSFET being a QUICK answer, it is also being an INSANE answer.
  10. 73's de Edd

    Pioneer S-W700 Subwoofer

    Sir coastman49 . . . . . . . . (Iz u reeeeely 73 'ish) Waiting to hear about the FWB status. If being at fault . . .LIKELY . . . I think that only the mere pittance of the purchase of a new FWB will initially be needed . . . and not the expense of all new output transistors . . . AS OF...
  11. 73's de Edd

    Pioneer S-W700 Subwoofer

    If you find the FWB defective and have put A.C. to them and possibly the filters, that's what is to be expecteld . Also the need of the use of an inline Test Lamp and interpretation of its use. ALONG with only an instant of power up as I emphasized in the last troubleshooting of readings.
  12. 73's de Edd

    Looking for a service manual / schematic

    Here is an application note from ON Semi further confirming the typical resistance values of the center burnt CS feed back resistor and the gate of the power FET's series resistor. I'm suspicioning the burn out, due to backfeed from a fused together DGS junction of the power FET and a back...
  13. 73's de Edd

    Pioneer S-W700 Subwoofer

    Sir coastman49 . . . . . I wonder how many fuses were put in that unit until it finally melted down to this current state of disrepair ? . . . Are you fully familiar with that history ?. I can see an INITIAL core failure, of probably just 1 of 4 power transistors that are in the audio power...
  14. 73's de Edd

    Pioneer S-W700 Subwoofer

    Sir coastman49 . . . . . Initially, just want to confirm that your test lamp is being an OLD SCHOOL filament-incandescent lamp . . . . not a newer CFL or LED family of unit .A RE-READ CONFIRMED . . . .INCANDESCENT. Is this board shot photo being in agreement with your board . . . ...
  15. 73's de Edd

    Mig welder wire speed controller problem

    Sir Pmax . . . . . NOW IN REFERENCING TO . . . I am seeing HIGH agreement between that welding forums schematic and your board, with only yours, having used 4 discrete diodes in top left corner whereas his was using RD2-WL02 a potted rectifier block and using different parts positionings...
  16. 73's de Edd

    Mig welder wire speed controller problem

    Sir Pmax . . . . . OH TAY ! . . . . .that schematic is being your MONEY SHOT ! Let me delve into any enhanced definition and more info to be extracted . . . . INITIALLY . . . . There is confirmation of my ascession of the SCR type along two other usable substitutes. The oscillator / pulse...
  17. 73's de Edd

    Mig welder wire speed controller problem

    Sir Pmax . . . . . . That circuit board certainly suggests it being of '80's lineage. I am unable to see all of the right side of the board . . .particularly all of the speed pot ? Also,in need of a GOOD photo of the bottom foil side where the REAL analysis of inner connections could be made...
  18. 73's de Edd

    Geometry issue and error in Philips 27ps55s CRT TV

    Sir jeffsmith3141 . . . . . It seems that GEOMETRY is more important . . . . and the effect is more noticeable . . . . on LARGER CRT sizes. Particularly the select few 40's ever made and the 35/36 and the 32's declining observances . You have the smaller 27. So o o o o o o if you are observing...
  19. 73's de Edd

    Perpetual moving sticks

    Sir FrenchConnection67 . . . . . You say . . . D2 : no connection to ground But is my cathofde RH pin marking correct ? and D5: no connection to ground Additionally, is my Cathode LH marking, being correct ? D9: no connection to ground Additionally, is my Cathode LH marking, being correct ...
  20. 73's de Edd

    Remington Shaver HC6550 not to full Power

    What voltage do you read with one probe on the bottom of one battery and the other probe on the bottom of the other? Verbal / semantics ambiguity lets me interpret that more than one way . REFERENCING MARKUP . . . . . . . . . I can see the compression indentation rings ( broken red dotted...
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