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  1. 73's de Edd

    Help with LED sign (Silent Radio) power supply please

    Sir slywuf . . . . . Very important . . .do you have the ~ $250 keyboard . . . (used) . . . that the unit uses for its programming ? Everything that you assigned to your P1 power connector seems correct. I just see the pin 5 as supplying the display LED's MAIN POWER for the display. And...
  2. 73's de Edd

    cap tester repair

    Sir pete geeeeeeeeee . . . . . Looks like you have no problems there then . . . . . Additionally . . . . . . since they were KNOWING that VOLTAGE SELECTOR switch was going to have some quite high voltage potential across it, at one end . . . they may have opted in using a hard surfaced...
  3. 73's de Edd

    Smoothing capacitor replacement. Value unknown.

    Sir Don1972 . . . . . Sorry . . . . don't have any data on that one unit. From your limited info given, so far, I would venture to say that your damaged component is going to be a surge limiter / NTC thermistor that is being in series with the AC line input. It should be electrically located...
  4. 73's de Edd

    cap tester repair

    The THOROUGH stiff brush down, with a STRONG degreaser would be the most important aspect of those units cleaning. Just using the SELECTIVE . . .PINPOINTED use of contact dope/silicone/lube should have them lasting with no voltage breakdown worries again.
  5. 73's de Edd

    cap tester repair

    Sir pete geeeeeeeeeeeeeeee Hey ! Wa a a a a a i t. . . . . . . . .un momento . . .por favor . . . . As all . . . . . may not be lost. First of all, I TRULY think that THE fault will be with the units 18 (17) position large rotary voltage section divider switch, since it is he one that is...
  6. 73's de Edd

    Comedy Thread

    Be sure to check out the catalog of all of our product line at . . . . . https://imgur.com/gallery/MY36U
  7. 73's de Edd

    Saft Power Systems PSU problems

    Sir Bashir Ahmed . . . . . Observations . . . . What we seem to have there is the battery maintenance system for telecons 48VDC line ringer supply . . . BUT . . .with there being less and less need for such a supply with the majority of phones now using simplified and less power hungry...
  8. 73's de Edd

    cap tester repair

    Sir Pete g . . . . . .. if I read between pin 8 6bn8 and pin 7 of type sw should I read the 1.5m (r6)? The voltage designating aspect of the eye tube is related to the left half of the schematic and the PURPLE mark up portions, with one variance, in the respect of there also being a...
  9. 73's de Edd

    TIP120 Transistors Appear Charred

    Sir vestaviascott . . . . . What gives ? I am seeing (5) TO-220 cased power transistors and their smaller companion TO-92 drivers. I see no heat sink compound residue on the faces of their heat sink tabs . . .unlesss you have cleaned it off. I see that flat spaced apart metal heat sink...
  10. 73's de Edd

    USB voltage / Amp tester not working on Hand Generator?

    Can you disassemble for inspection and confirm exactly what is being inside. Like Sir Harald . . . . I HIGHLY suspicion there to be a rechargeable battery or a SUPER capacitor inside for creating a more uniform power output. The battery family could have deteriorated due to atrophy, while a...
  11. 73's de Edd

    Oscilloscop trace at sceen bottom

    Sir gixerags . . . . . Considering the forthcoming and mentioned suspicions and now relating them to that specific unit of yours. Now duly note on the supplied schematic of the Telinstruments of yours, that there is basically a set of " coarse and vernier " adjustments for trace positioning...
  12. 73's de Edd

    cap tester repair

    MINOR SCHEMATIC LABELLING ERRATA . . . WHERE ? On the large UNITIZED schematics, right center half, on the BRIDGE-DISCHARGE-LEAKAGE SWITCH and its section A on the left. WHAT ? The RED inset info of the switches closures in LEAKAGE mode is erroneously showing a #3 to # 5 contact...
  13. 73's de Edd

    cap tester repair

    Sir pete geeeeeeeeee . . . . . .(and Sir Steve as an interested spectator up in the 56th tier of the Peanut Gallery ) I'm going to speed you forward a bit . . .with your having said that the working ? unit has developed this situation with time. At the top you can see the RED - GREEN - BLUE...
  14. 73's de Edd

    CTEK MXS 3.8 repair

    Yep . . . . no voltage ( high millivolts) across R4 until FET gate receives drive pulses . . . and just for those short durations . Back to you after I solve the double dot dithering problem on an APQ117 stealth radar . . . .
  15. 73's de Edd

    cap tester repair

    Sir pete geeeeeeeeeee . . . . . . . ALL BEHOLD . . . now . . . instead of your units original split up / two piece schematic, you (a tout le monde) now have yourselves a UNITIZED one page version, with my added mark-ups that are being the involved circuitry, flow paths, and switch...
  16. 73's de Edd

    CTEK MXS 3.8 repair

    Sir bushtech . . . . . This design ap note might help a bit in seeing how they were thinking and the units circuitry . I found no related 1.5 k . . .and that would tend to have some of that 300 vdc tied into it to be able to fry it. And none of the lower voltage 18VDC from its zener and the...
  17. 73's de Edd

    G & E Bradley CT471C

    Sir Sinewave. . . . . See the need for initial info . . .relevent to the instruments pristine ORIGINAL condition . . . .versus the install of silicon transistors versus the OEM germanium transistors. Without your telling, I wouldn't have known that changed situation . . . . in the half...
  18. 73's de Edd

    Panasonic RC-X210 humming and fast clock

    Sir sfm153 . . . . . Your giving that model number reveals that to be a circa 1991 vintage unit . . . .right-o ? Considering that the clocks electronics is . . . NOW . . . . relying heavily upon the steady state DC output of the back up battery . . . to even get a cognizant display . . ...
  19. 73's de Edd

    cap tester repair

    Sir pete geeeeeeeeeeeeeee . . . . . Considerring that you have already replaced the main electrolytic capacitors in that unit . . . . To save some time . . . use this procedure given below and tell us the exact points of failure. Then we can figure what is going on...
  20. 73's de Edd

    G & E Bradley CT471C

    Sir Sinewave . . . . . Dad was an EARLY day geophysicist . . . . which involved cross association with physics-mechanical engineering-hydrodynamics-chemistry-mathematics-drafting-electricity and photography. So in my very early years . . his words . . . . of throwing ME a bone . . . . was...
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