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  1. 73's de Edd

    Can anyone give me a basic rundown of this circuit?

    . Sir Archie Moore . . . . . . . Didn't you have the rest of the accompanying explanatory text with the schematic ? NOT much there, so don't expect much. http://www.free-circuits.com/circuits/audio/104/laser-communication-system Yes that is a photocel which is the receptor of the audio...
  2. 73's de Edd

    Amp keeps going into protection mode

    . Sir Rick79 . . . . . . . Sure looks to me like your protection circuitry has been "hypersensitized" by the those deficiencies that I had mentioned earlier. A Test: Test as you have been doing before, for detecting the protection threshold , but put a tic reference mark at the very...
  3. 73's de Edd

    Repairing Betamax VCR

    . Sir Jdlca . . . . . . . Your 2nd and 3rd photos down are showing a portion of the linear power supply that the unit uses. I found a SANYO manual for this unit, BUT it is having NO schematics , but a very- very THOROUGH coverage of its mechanics and adjustments.(RARELY needed ! ) Can you...
  4. 73's de Edd

    help repair router adapter

    Sir pharaon. . . . . . . . . . . . . I am seeing the 4 diodes used for the FULL Wave Bridge rectifier, and they are located very close to the BLUE AC input wire. Then you say: the D2 is one of the FULL Wave Bridge circuit that i'll replace with 4 new 1N4007 units I still see D2 as NOT being...
  5. 73's de Edd

    Soldering Connections For My Replacement 3.5 Stereo Plug

    . Sir Peter Goodchild . . . . . . . I wouldn't even think about using the compressed tube/sleeves procedure. I have had luck with both types of wiring, both your spiral conductor which you are now showing and those on small earpieces that just use single strands of ~ #30 copper wire . I...
  6. 73's de Edd

    Repairing Betamax VCR

    . Sir Jdlca . . . . . . . Your mystery part is a transformer / inductor . . .VERY HIGH_HIGH probability of normally having no problem whatsoever.. The found family of adhesive you have encountered is less problematic than yellowish brown formulations. With their high proclivity of leakage...
  7. 73's de Edd

    NO POWER! Sony DAV-HDX675 Home Theatre

    . Sir Adriano Setti . . . . . . . 100 % confirm AC power presence. Track down the power cord to the PCB it connects to . Nearby is clip in fuse F901. See if it is blown. If so, do not replace, as it will then blow one hundred, eleven dollars and 'lebenteen cents worth of nearby parts...
  8. 73's de Edd

    Amp keeps going into protection mode

    . Sir Rick79 . . . . . . . With your progress so far . . . looks like an amp with a high DC presence or imbalance on its output line is not being there . . . . what with all of your monitored DC outputs being way down in the sub 200 MV ranges. What I suspicion is that the problem is in the...
  9. 73's de Edd

    help repair router adapter

    Sir pharaon. . . . . . . . . . . . . when i connect it the multimeter gave me a reading of 12 v as an output. Thats GOOD as it seems like the power converter is working and putting out 12VDC but we would not be able to get the FULL 12 watts power capability from it, when using the lamp in...
  10. 73's de Edd

    LG Flatron L1942T-PF monitor no power

    Sir mikey5791 . . . . . . . That certainly sounds bad . . . . . but measure again from pin 6 to 7 And then from pin 6 to 5 and pass those readings back to me Will give you a "solder tacking" (a fast /temporary connection ) explanation picture tomorrow . . .I am on small laptop now. 73's...
  11. 73's de Edd

    Woodwork machine playing up

    . Sir . . . . . . .monkeyapples . . . . . . . . . . (and that one is being a first for me ?) HOWTODOITTOIT . . . . You say: 1 . . . . . saw motor struggles and doesn't start 2 . . . . . The motor turns freely by hand 3 . . . . . If I have the switch in the start position the...
  12. 73's de Edd

    HV flyback psu

    . Sir vitom001. . . . . . . Can you try two things ? : On that Pin 2 of the flyback transformer put about a 10 ufd 100 VDC from that terminal to ground . . .with + to 2 and negative to ground and additionally, hi freq shunt THAT cap with a .1 ufd ceramic cap. Give a short try out...
  13. 73's de Edd

    Help fixing old walkie talkie

    . Sir ATA . . . . . . . Great info ! Now you have convinced me of my need to go dig out that manual and then lets continue the units analysis and troubleshooting. By pressing the red call button on the Midland the beep can clearly be heard on the Onkyo although different frequence...
  14. 73's de Edd

    Help fixing old walkie talkie

    . Sir ATA . . . . . . . You got answers . . . I got some GOOD questions . . . . . in order to fine tune my design analysis. Is / was there ever a CB band in Denmark ? What is the significance of this unit ? Is it nostalgic to you, or once a possession of a passed on relative ? Or...
  15. 73's de Edd

    LG Flatron L1942T-PF monitor no power

    Sir mikey5791 . . . . . . . That's a relief, with those parts being found on the other side of the board . . . so I actually wasn't using the wrong schema or board layout for my referencing. Initially . . . . . your Answers: On power IC at U101 it is label LAF0001 . . . . . 7=Vcc Putting my...
  16. 73's de Edd

    12V Rechargeble Fan Circuit Problem

    . Sir Nauman Muhammad . . . . . . . Behold . . .herewith . . . .is your comparative board referencing . . .as being derived from those GOOD photos which you supplied. Far right is the boards components layout In the center is a minimally touched photo . . . to use for foil path...
  17. 73's de Edd

    Circuit diagrams of TORO DDC-4

    Sir zulu . . . . . . . What is the nature of your problem with that controller. And would it be in this family ? http://www.amazon.com/Toro-DDCWP-4-9V-Waterproof-Controlled-Controller/dp/B0052D1ZPE http://www.manualslib.com/manual/738511/Toro-Ddcwp-Series.html?page=2#manual 73's de Edd
  18. 73's de Edd

    12V Rechargeble Fan Circuit Problem

    . Sir Nauman Muhammad. . . . . . . That unit should serve these measuring purposes adequately, and with its small size it can be stored away on the same shelf that you now have your accounting abacus. The board that you are working with seems to have the charging circuitry and battery...
  19. 73's de Edd

    Clean iron bit, dirty solder?? Fixed... sort of

    . . Sir Sir Random Guy . . . . . . . MINIMALLY . . . I like to have a tiplet end tinned all around, at the least, to the amount of a B-B . . .OPTIMALLY I usually keep my tip tinned back about 1/4 in (7mm). In the latter utilization, I can slant a tip and move in to a small transistors...
  20. 73's de Edd

    Clean iron bit, dirty solder?? Fixed... sort of

    Sir Random Guy . . . . . . . ANTEX . . . .ANTEX . . . . why I haven't used those little jewels since the late nineteen sixties, for soldering on fine work or in cramped places. However . . .I know that I still have at least 3 stored away. Methinks that your tip just got TOO HOT before...
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