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  1. 73's de Edd

    Need help with a grounding wire issue on PC audio device.

    SIr Noreaster . . . . . Bottom left picture (above My Questions) shows a bare wire that should go inside the plastic shrouded cable and is spiraled around an internal wrapped aluminum foil . . .(to acquire connectivity) . . .shroud that performs the shielding of all of the internal cables...
  2. 73's de Edd

    No AC power from a Powerhouse 500WI inverter generator

  3. 73's de Edd

    Power Supply Died

    Sir Wayne Webb . . . . . . . Does anything on the unit light up or indicate anymore? The fuse would typically be at fault for all being dead . . .however . . .if its good . . . the problem might be associated with there possibly being a thermal device hooked up within the unit in the case of...
  4. 73's de Edd

    need help

    The switch reference gave no useful info on the LED aspect, but that switch is in NO way up to handling the high current involved. It's more likely to arc and fuse (spot weld) the contacts together. The high current aspect is for the MOSFET to handle. The switch contacts should only have to...
  5. 73's de Edd

    Cambridge SoundWorks Radio CD740

    Try procedure 1wo then . . . .but it is dependent upon a vewy-vewy bwite light! . . . . for inspection illumination.. I used a mini flexible gooseneck that used a 222 prefocused penlight lamp . . . .but now -a - days a WHITE LED version should be available. 73's de Edd .
  6. 73's de Edd

    Power Supply Died

    And you KNOW, that you should have given us the brand and model number of that power supply . 73's de Edd
  7. 73's de Edd

    Replacing Broken Power Circuit Of A Philips Dock

    Sir cybertwenties . . . . . . . Can you visually inspect your board and see if this overlay is correct ? Particularly, all of the filter capacitor leads, but I think that they are right. The dark area BELOW YELLOW A filter capacitor still precludes my seeing what it is hiding. See what...
  8. 73's de Edd

    Cambridge SoundWorks Radio CD740

    Sir zipstah. . . . . . . Pull the dust cover(s) and the discs are . . . . . EVENTUALLY . . . . . viewable and accessible . If not readily accessible , ( scared to do a full teardown ) try a tongue depressor linearly overwound with SCOTCH clear packing tape . . .sticky side out . . ...
  9. 73's de Edd

    need help

    Sir tim laur . . . . . . . After a careful perusal of the situation: " We dun thinks that you'se gots this a heres thangs, being all "warred" ups wrongs ! " With an additional misconception of the power MOSFETS function / capability. The FET performs all of the (start 96 font type)...
  10. 73's de Edd

    Technics SA-828 Receiver from 70s- Is it worth trying to save this aging patient?

    . Sir Iceman cometh . . . . . . .where you go o o o o o o o o o ? I certainly don't suspect their failure at all, but the HF snubber pairs on this unit would be the R698 + C629 and the R692 + C630 R/C pairs in the AF output stages. ( In which case you would be expecting a dead shorted...
  11. 73's de Edd

    Designing A Power Supply

    Having seen the meager power consumption of the other units, it seems that the loading down of the supply , with my mentioned substitute load value, needs to be done. Then you read its loaded down output voltage. 73's de Edd .
  12. 73's de Edd

    Amp In Protection Mode

    Sir Rick 79 . . . . . After having now seen all of the "front end" transistors from this units LEFT CHANNEL having progressively been tested from Q601-3-5-7 and 9 . . . . . all inclusive. (And little D605 . . .saying me too . . . .ME TOO ! ) The most likely suspect now for a transistor fault...
  13. 73's de Edd

    Schematic needed for Sprague Mike-O-Meter

    In reality . . .do you have a working unit . . . with no problems and merely want its schematic / manual. Or do you have an inoperative unit and need to repair it ? 73's de Edd
  14. 73's de Edd

    Designing A Power Supply

    Sir Javier . . . . . . . . . . . . . No luck on finding that EPS83V . . . as that researches out, with that number being a PROJECTOR. In the photo below there are a string of printers at the left row, with only one having an "83" numerical reference, but with the two below, including an...
  15. 73's de Edd

    Replacing Broken Power Circuit Of A Philips Dock

    On those two photos above . . .can you try duplicates but lets try flash this time and . . .hope. i just absolutely can't work with the utter darkness down within the components side of the board.
  16. 73's de Edd

    Designing A Power Supply

    Senor Javier . . . . . . You say: I got this power supply from an Epson printer. Any chance that it is being a PCB inside of the unit, or is it being external of the printer. And it being in the order of a "Wall Wart" but with it being a switch mode unit usually they are given a more...
  17. 73's de Edd

    Infrared Remote Control

    . Sir AnonyMouse . . . . . . .et . . .Sir Sundy I'm sure that its relevant to surmising that hard wired activation switches might be placed at the very top and bottom of the stairway for manually starting the cycling of a chair movement. HOWEVER . . .his not yet perceived aspect /...
  18. 73's de Edd

    Help identifying a resistor

    . Sir Bernardo SOUSA . . . . . After a "reading" of your board I have transferred markups onto the schematic snippet below. Looks like the sets 24 volt supplies A and B are being derived from the dual anode power Schottky rectifiers D205 and D206. Grab ye olde voltmeter probes and place the...
  19. 73's de Edd

    Help identifying a resistor

    Sir Bernardo SOUSA . . . . . I will need more time than I have available now, but in initially looking at the units use in the circuitry design. I am seeing that resistor as completing a resistive ground link for two peak limiting snubber capacitors for two power MOSFETS that drive the...
  20. 73's de Edd

    Flip or mirror a Sony Trinitron

    What is the brand and model of the monitor to be used, in order to research more exacting info.. ELECTRICALLY: Reversing vertical drive connections to the yoke , creates/corrects the upside down effect. Reversing the Hoz drive connections to the yoke reverses the right to left positioning...
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