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  1. 73's de Edd

    LM4871 amplifier circuit not working, please help!

    Sir catalin123m. . . . . . . Replotted . . . . . . on the internals of the IC aspect . Hmmmmmm . . .an activity stream . . . . . aural monitor . . . . . Refer down to the RED boxed area on the data sheet and their treatment of pin 1 with its pullup resistor and then the required "LOW"...
  2. 73's de Edd

    B & O Penta amplifier repair and Tr equivalents

    punkieys17 . . . . . . . Using my parts list . . .here is what is shown. CONFIRM the OTHER transistor numbers present in the unit to see if they agree, initially. 73's de Edd
  3. 73's de Edd

    ORB Super Eight 200 Subwoofer blows fuses

    I would replace as a new SET. Wait for power test procedure methodology. 73's de Edd
  4. 73's de Edd

    Replacing Broken Power Circuit Of A Philips Dock

    Sir cybertwenties . . . . . . . Supplemental info feedback needed from your post # 24 photo. Example . . . . R8 coding is being BROWN-BLACK-ORANGE for 10K Neighbor . . . . R5's vertical mounting precludes my seeing its color coding. What is the part number of the nearby 4 pin optical...
  5. 73's de Edd

    B & O Penta amplifier repair and Tr equivalents

    Sir punkieys17 . . . . . . . I see that those 3 items were on my schematic snippet sent back on post # 13 . Here they are, along with a re submission of that schematic page at the bottom. I don't see those numbers being "double assigned" in the systems very low signal front end area 2, as...
  6. 73's de Edd

    ORB Super Eight 200 Subwoofer blows fuses

    Run a cursory test to confirm if any of the IRF 530's and two IRF730's are shorted from Drain to Source. 73's de Edd
  7. 73's de Edd

    ORB Super Eight 200 Subwoofer blows fuses

    . Sir Rick79 . . . . . . . Short for time at this instant . . . . .use this info: In ADDITION to his tests, also do a test across the + and - terminals of the FWB. If it is shorted there, that is suggestive of one or both of the two paired IRF730 switch mode MOSFETS associated with...
  8. 73's de Edd

    Sherwood RA-1140 stereo receiver

    Sir rtripboy. . . . . . . PROCEDURALS: Confirm that the fuse replaced was the 5A unit in the RED box. That the 2 fuses in the GREEN box are good. Test to see that the 4 diodes in the YELLOW boxes are good. Then . . .IF you find no SHORTED diodes . . .proceed . . . . . Take DVM and place in...
  9. 73's de Edd

    ORB Super Eight 200 Subwoofer blows fuses

    . Sir Rick 79 . . . . . . . . . . . . OK here we go . . . first: Board Functions Analysis: We have the top PINK rectangular area, which is the units switch mode power supply; the YELLOW rectangular area just below it is the units class D digital power amplifier portion of the unit. The...
  10. 73's de Edd

    PCB from speakers broken please help

    I would think that you are OK on that 18.26 VDC. Can we see a photo of the side of the heat sink showing the semiconductors mounted to it . . . and their numbers 73's de Edd
  11. 73's de Edd

    Volume Control On Scanner

    Sir vstyn . . . . . With time onset . . .expect that cap C41 possibly may have declined in capacitance. YELLOW RECTANGLE . . .MARK-UP Sub another like value unit across it to see if volume comes up. Its rated at 100 ufd at 10VDC or greater. Coming up . . . . . . Do you have a VCR -CD or DVD...
  12. 73's de Edd

    Burned a solenoid with a relay timer, and I don't know why

    Sir SylvesterG . . . . . AAAAAAAAAAAhhhhhhh so . . . . . most velly diabolically clever . . . .those clazeee Chineeee. Makee case Yellow . . .same - same Mistah FLUKE . . . . .Makee Logo background RED . . . .same-same Mistah FLUKE . . . .last three lettah . . .they lookee velly likee UKE...
  13. 73's de Edd

    PCB from speakers broken please help

    . Sir chidinma onyejuruwa . . . . . . . (Whew . . . .try as I can . . . . .I just can't say your name . . . . three times VERY-VERY fast !) Hoping that this is being your units model family. " I ain't done never heards of enny of these 'a here Edifier Spinnaker . . .Horny type . ...
  14. 73's de Edd

    The work of IC BA 9700

    Sir baceyeb . . . Unfortunately unless being a member . . .requiring SOME involvement . . .from the norm forum. Radio Museum only gives you a micro-peep. See if you are not happier with the manufacturer's . . .ROHM . . .data sheet here...
  15. 73's de Edd

    Burned a solenoid with a relay timer, and I don't know why

    Sir SylvesterG . . . . . I was just showing another wiring option but what you show agrees and I just changed the POSITIVE polarity wiring to RED color coding. PLUS all of the other items are clustered on this page. Down in the actual power supply the circuitry voltage might eventually end up...
  16. 73's de Edd

    Burned a solenoid with a relay timer, and I don't know why

    . Sir SylvesterG . . . . . How about this info. They are ve e e e ry vague on written aspects on the power supply until you read it on the unit proper with its specs and the polarity of the connector feeding our . . .AC / DC . . .gender neutral . . .solenoid. AC line power goes into pins 2...
  17. 73's de Edd

    ORB Super Eight 200 Subwoofer blows fuses

    . Sir Rick79 . . . . . Preliminary Reference info posting: Tune in tomorrow for blow by blow continuum . . . .same time same station. 73's de Edd .
  18. 73's de Edd

    Replacing Broken Power Circuit Of A Philips Dock

    Sir .cybertwenties . . . . . . Its a miracle ! . . . . . .that you were so readily able to get inside. of that supply case. USUALLY the case parts have a seam that is ultrasonically sealed together. I do see that the unit should be adequate for your power needs.. We just need to modify for...
  19. 73's de Edd

    HP 54510A Power Supply Smelling

    What would I do . . . . . I personally would go with the 680 ufd units and I would be for the 105 C more beefy and ruggedized internals. I definitely prefer the snap in type due to the infinitely superior seal afforded by them as compared to the leaded types. I also prefer the Mil spec / NASA...
  20. 73's de Edd

    Technics SA-G90 With "Overload" message.

    R671 reads .526 with meter on diode mode R672 reads .318 with meter on diode mode The idea there was to test resistance in OHMs function. I you don't get a valid reading while testing those two, through all of your ohms ranges, consider a possibility of a damaged OHMS functionality of your...
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