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  1. 73's de Edd

    Yamaha rxv 465 no display and no power..

    Sir Hermant Choudary . . . . . By all means DON'T inject power into that 3.3 VDC supply buss to try to heat up a bad part for thermal emissivity.. This unit has SEVERAL specific parts that are now totally UNOBTANIUM. Look at my schema snippet below and track down Schottky diode D63 and see if...
  2. 73's de Edd

    Yamaha rxv 465 no display and no power..

    Sir Hemant Choudhary . . . . . Correction: Page 118 was being 117 main power supply at the bottom of the page. Now, as the stk pins are floating, shall i go ahead and resolder it? With you referring to IT, you must mean only the IC 100 STK433-330-E, with you not having touched the pins...
  3. 73's de Edd

    Bose AWRCC1

    Memaw9f . . . . . You never gave a photo . . .to date . . . . but if the unit fell flat on its face onto the floor, from a distance, the YELLOW boxed marked ferrite rod antenna could have broken near its center . That would only affect AM radio reception, FM would be normal. Is that what...
  4. 73's de Edd

    bk-precision-1570

    Messr Henri Monnier . . . . If you are familiar with scope controls and functions already and just need control / operating familiarity looks like the 1560 series is close enough to use its manual. They seen to be control by control until you get to the delayed sweep and intensified sweep...
  5. 73's de Edd

    Oscillator simple circuit as dummy supply

    Is this being relevant to your situation ?
  6. 73's de Edd

    Onkyo TX-NR5007 Protect Mode

    Sir jbkiansiang . . . . . That's being one very HEAVEE and complex hernia creating unit . . . with 8 sets of power amplifier output transistor sets and 8 amplifier / driver boards that requires 283 pages of repair documentation and schematics. Herewith . . . . . . your simplified and...
  7. 73's de Edd

    Cavity filter question

    That's the last time that you will ever see it looking that good . . . .as they were assembled in an inert filler zone.
  8. 73's de Edd

    Realistic STA-2100D

    Sir tomcat65 . . . . You have Fuse numbers F1 . . .1.5A and F2 . . .2.5A which are related to the supplies of your lighting that you were jes' messin' with. Fuse numbers 3 . . .1.5A and 4 . . .1.5A are related to regulated power supplies. Weirdly, the dual, brute strength power supply of...
  9. 73's de Edd

    Bose AWRCC1

    Your photo attachment . . . .didn't make the trip Why do I have this weird feeling, that it is going to be the inside AM ferrite rod antenna ?
  10. 73's de Edd

    Identify a burnt resistor

    Sir rico4295 . . . Observations and suspicions . . . . The unaffected R2 and R3 units are being of CARBON deposition / SPIRAL laser trimmed construction . The affected R1, I VERY highly suspect, to be of METAL film / SPIRAL laser trimmed construction. They hold up QUITE well under overload ...
  11. 73's de Edd

    Chinese Hiland 0-30V/Audioguru PSU build (down the rabbit hole)

    Sir bushtech . . . . . I think that the simplest solution with that being a toroidal transformer and a potential very-very short and instantaneous initial surge of up to. 30 amps. Wisely you don't want a fast blowing, single wire link fuse , nor even the 3 bead modification which you are...
  12. 73's de Edd

    Cavity filter question

    not letting the dust etc in Otherwise its a preferred nitrogen fill
  13. 73's de Edd

    Swan mark 2 vintage HF RF amp.

    Sir bgk6 . . . . . I would change them all out, since at higher frequencies operation, the increasing inductance reactance of L4 and L5 will have them sharing more power thru them. Definitely stay with CARBON COMPOSITION types for replacements.. You say " they show no resistance at all " Now...
  14. 73's de Edd

    Yamaha rxv 465 no display and no power..

    Sir Hemant Choudhary . . . . . 1 . . . . . Also, Do you mean to say, the +3.3S is ONLY generated at this point and will not be switched unless Q201 is supplied with a signal from micro. Here is the sourcing of both of your units 3.3 VDC MAIN and 3.3 VDC SWITCHED supplies. FLOW THROUGH . ...
  15. 73's de Edd

    Centre tapped Transformer

    That transformer construction automatically has the wiring done by the manufacturer, so that its going to have proper series phasing relationships. Any chance that you made a boo-boo on one diodes polarity of installation, or that you have one open diode ? How much capacitance is the main...
  16. 73's de Edd

    Diode Equivelent

    I used handfuls of RCA 2070's and their 750 ma current specs which were in a metal housing, which you don't even see anymore. It looks like the round housing of an old germanium transistor but with 1 lead spot welded to the center of the closed end of the case. The other lead had a glass...
  17. 73's de Edd

    Yamaha rxv 465 no display and no power..

    Sir Hemant Choudhary . . . . . Considering that the Q200 FET is good and that the Q201 is missing , you need to get another in the circuit. I'm sure that you won't have a digital transistor, so you can build one up with a common PNP small signal transistor, using the info I have given you...
  18. 73's de Edd

    Chinese Hiland 0-30V/Audioguru PSU build (down the rabbit hole)

    Herr bushmeister . . . . You say . . . . . Why . . .'soitanly . . .when being tasked at its prior application in its handling of 3-400 watts of a comp power supply,as being compared to your mere 75-100 watts now. At a stone cold turn on it . . will be serving as an 8 Ω surge cushion and...
  19. 73's de Edd

    Realistic STA-2100D

    Sir tomcat65 . . . . . YETH ! . . . . . . all of the power that bulb consumes, has to pass thru a transistor within that IC to ground. Put a conventional 300ma or 150 ma lamp in its place and you VERY likely will then have the full 120 ma that series 100Ω resistor will let pass, and be...
  20. 73's de Edd

    Chinese Hiland 0-30V/Audioguru PSU build (down the rabbit hole)

    Methinks that you need another bezel . . . . for your meter bezel . . . . . to cover up your panel hole boo-boo's. Is your fuse problem ONLY when he system is started up from a stone cold initial power up ? Or will it still do it, after main filter capacitors are still maintaining somewhat...
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