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  1. 73's de Edd

    Why does my Royer high voltage generator switch to far higher frequency when loaded.

    Considerations and unknown attributes . . . . . That is being a hefty level. Is your transformer core mass being properly sized to the power level at hand ?. If ferrite based, is the proper core permeability at a prime frequency being considered.? If operational resonance is being in the...
  2. 73's de Edd

    Fluke Multimeter

    Ya gotta pull 1 cap lead out of circuit to be able to test , fully out of circuit, otherwise you got all potential parallel or series shunted variants in the involved circuit.
  3. 73's de Edd

    Electro Pounce Machine

    Sir David Shaughnessy . . . . . . I heartily second the motion, with a strong Mega- ditto to Sir AK for his astute observations.. Whatt I am seeing is AC line input thru a fuse and power switch that then feeds through a lamp dimmer, which then feeds its outputted variable AC to the primary...
  4. 73's de Edd

    Laptop fan not work

    Sir grazkas . . . . . Your performing the test given, confirms your fan driver chip as being OK. You are just missing that “ EN_FAN1 “ logic level high to enable the fan. You have not told me what brand and model number unit you have, but somewhere in its construction should be some analog...
  5. 73's de Edd

    LG Flatron E2742V-BN, need help identifying Voltage regulator

    In looking up the pinout for you confirmation I see that I C has a bottom soldered heat sink pad. You qualified for non destructive hot air rework ?
  6. 73's de Edd

    Laptop fan not work

    Sir grazkas . . . . . G993P1UF . . . . . . Linear Fan Driver As it should . . .when you apply 5VDC DIRECTLY from the 5vdc supply (from pin 2) to the fan (pin 1 ) Do you have a high logic level coming into pin 4 ? If not, touch a leaded 1k resistor from pin 1 or 2 over to pin 4 and see...
  7. 73's de Edd

    Finding equivalent semiconductors -any websites?

    It will be plug in backwards compatible or they woud have changed its designation.
  8. 73's de Edd

    Pioneer A-503R, speakers relay #ASR-112 replacement

    Sir spanish_inq . . . . . I see that the unit has the capabilities of taking in audio inputs from: Tuner CD Line / VCR Tape 1 Play and Rec Tape 2 Play and Rec I also see that the main R and L power amplifier portions of the unit are using discrete component construction instead of an...
  9. 73's de Edd

    Finding equivalent semiconductors -any websites?

    Sir TTL . . . . . Expounding further upon the Right Revered and Most Honnable External -nets info . . . . (¿Que paaaaaaaaaaaaasssssssssa?) There used to be a cross reference put out by just about every semiconductor manufacturer, with the General Electric’s GE line, the Motorola’s HEP line and...
  10. 73's de Edd

    Not really a repair, but some help going in the right direction appreciated

    Sir fiveseven15 . . . . . Certainly . . . . if you help . . . . first of all , about that wire, of which you removed the black “pookie” deposited around part of it, to reveal a connected wire. Is it being a wire that is being formed as a “U” loop and then bent around and passing under a white...
  11. 73's de Edd

    Why does my Royer high voltage generator switch to far higher frequency when loaded.

    Sir martin de jong . . . . You could do better on your feedback technique. Consult . . . . .Pages 38 . . . . 39 http://digitalcommons.calpoly.edu/cgi/viewcontent.cgi?article=1266&context=theses Reading all of the whole data base will relate to several coincident problems that you are...
  12. 73's de Edd

    Yamaha RX-V475 not working

    Sir raczq . . . . . You have picked a section of the TV that is using a switch mode power supply. It so happens that both of us are using the same schematic which shows a markup of voltage values while using 120VAC input. In Poland you are using twice that voltage input. If you look at the...
  13. 73's de Edd

    Yamaha RX-V475 not working

    Sir raczq . . . . . You did not quantify by how much . . . . . therefore . . . most importantly, what does the voltage output from this supply show . Hopefully right at 5.6 VDC and without any ac ripple and it is not fluctuating up and down ? RELEVANT REFERENCE: 73's de Edd
  14. 73's de Edd

    Yamaha RX-V475 not working

    Sir raczq . . . . . The unit just might have found a fault . . . and it possibly only having been intermittent in nature . . . .yet, the unit had gone into auto-protect mode. Check out that possibility by powering up and seeing if your problem still exists. If so: Then you find INFO and...
  15. 73's de Edd

    Wonderwall projector picture is not clear after cleaning

    30 years ago I remember ribbon cables being constructed so as to be quite hardy, When calculators started offering right at 1 inch high digits and being on sale at $1.99 I had taken one and was going to use the display for making a frequency counters LCD readout display. I acomplished that but...
  16. 73's de Edd

    Light bar: intended for car battery, but....

    Sir mattfara . . . . . Tell ya’ what I’m gonna do . . . . . . I will just tack your connection explanation to the units schematic, just in case you . . .or any others . . . . are up against repairing one of these units. The HEAVY outer shield cable is the negative connection and the inner...
  17. 73's de Edd

    Wonderwall projector picture is not clear after cleaning

    so we can watch movies outside. This unit is not even in the same league of those capabilities . . . . unless it is being watched by Mr Magoo. Final photo 5 . . . . . tells it all . . . .edges of top and bottom and left side damaged and PRINCIPALLY the right bottom quarter of the LCD mosaic is...
  18. 73's de Edd

    What transformer is this?

    Tell us more -Tell us more- Tell us more ! . . . . . . .a la Grease. With what you initially told us, made me think of an ultrasonic face massager . Does the coiled blue wire, break out and become the two left white wires which we see? Are there any glass electrodes on the end connection...
  19. 73's de Edd

    Whirlpool l1373 card (invensys 475560 )can't identify number for part circled inphoto can you help

    Three water valves . . . . you can monitor each ( or ALL of the gates of all of them) to confirm if drive is getting to them, if so, the water solenoids should be activated by their respective drivers.
  20. 73's de Edd

    Pioneer A-503R, speakers relay #ASR-112 replacement

    Sir spanish_inq . . . . . . .(uisition) That’s being an obsoleted relay now . . as an OMRON G5R-2232-PG . I can’t ascertain if case height obstruction is / could be a problem, from your picture. Can you get side DC coil specs from the original relays. I think that a currently available...
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