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  1. 73's de Edd

    Loewe TV Chassis Q2500 Startup Failure

    Sir Dave . . . . . " free-running oscillator that got synced to the incoming signal " That dates, all the way back to day one of tube technology of the handling of hoz circuitry. Black and white difference in solid state. OH . . .NOOOOOOoooooooooo . . . To err is human and you certainly...
  2. 73's de Edd

    Edifier x600 subwoofer very weak sound

    Sir aceh20012002 . . . . A solo speaker involved in unit so no phasing problems being in the LOW frequency spectrum. And here I was, fully expecting that Edifier x600 subwoofer system to be some BIG 'ole thing . . .and it turned out to have a small 6 1/2 woofer with its audio power being...
  3. 73's de Edd

    Sony hcd991AV.transformer

    I certainly don't have a schematic, but will mark up what I can see, a bit later. On your Photo # 6 down. Is the fuse blown. Doesn't the large filter capacitor further over, look bad on top? Is the blue cap beside the fuse having its viewable end cap missing ?
  4. 73's de Edd

    PT2262/PT2272

    JunCapils . . . . . Can you give me a link for my researching of your transmit and receive modules. BUT . . . . by my observation TRANSMIT MODULE . . . Think that I just might BARELY ? see its power and ground connections at the top. Its using SWIF oscillator technology so its frequency...
  5. 73's de Edd

    Digital piano won't power ON

    Actually, at the D17 silkscreen marking, you have both the heavy wire gauge of the toroid AND a PCB copper square trying to steal your heat, while on the other diode lead, you have the whole ground plane pleading for and carrying off your heat. ADD flux and fresh solder to both sides of the...
  6. 73's de Edd

    Need schematic for Realistic 31-2020A graphic equalizer

    Sir Quikfix . . . . . If lightning actually has struck twice . . . . your same fix would be: The marked in RED BOX . . . as being PNP pass transistor Q504. BUT . . . an additionally blown R512 fusible resistor or shorted D503 Zener diode are equally being suspect. RELEVANT SCHEMATIC...
  7. 73's de Edd

    PT2262/PT2272

    Give us a close up photo of the RF xmit and receiver construction of yours.
  8. 73's de Edd

    Pioneer SA-505 clicking

    Sir tooter . . . I am sure that you can see by now, by referencing, that the PNP 2SA1104 transistors go to the center of the set of 4 and the NPN 2SC2579 are being the extreme outer units in the physical layout on their heatsink.. The explanation for the ASR1107 24VDC relay and the 48VDC...
  9. 73's de Edd

    GE Classic Radio Player 7-4135 schematic and amp question.

    Sir Jason Watkins . . . . . Where did I lose you . . . . then ?. If you heard the HUMM thru the speaker, you verified that all is good for being able to / for connnecting to an external amp. I may have lost you on just the very end, in the manner of connecting up a shielded line to the ext amp...
  10. 73's de Edd

    Simple Low Frequency Sound Generator

    Sir Clemson2019 . . . . . So . . . . .you need yourselfs a C3 note . . . .then. I would be using a dedicated tone generator as my choice, rather than some purified square wave . . . .or better yet . . .a triangle wave generation and then trying to clean it up with multi filtering. Here is...
  11. 73's de Edd

    Kenwood KR-865G Burnt Resistor

    Sir KilgoreCemetery . . . . . Did I miss my burial ceremonies . . . or do you now have me rescheduled? Sooooooooooo . . . . lets just use the old hypothesis / to / tenet / to / axiom of : " Half of a resistor, is being better than no resistor at all. " First you didn't give . ...
  12. 73's de Edd

    Capacitor problem

    Sir NaturesColor . . . . . Ahhhhh So . . . . most honnable motor . . . . come from and made by Ke Ting Industries in Tai-wan-on. Are there TWO separate capacitors . . . . . one being under each metal housing . . . like the one you are touching? With the other one possibly also being bad...
  13. 73's de Edd

    GE Classic Radio Player 7-4135 schematic and amp question.

    Why is there a motor at the top of the unit? How about a cassette player and recorder at the left, with its drop down electronics board under it and spare tape storage on the right half . . .access is obtained by lifting up the top lid. NOW if this was a CROSLEY retro unit, you would have...
  14. 73's de Edd

    GE Classic Radio Player 7-4135 schematic and amp question.

    Sir Jason Watkins . . . . . It's a miracle . . . IT'S A MIRACLE . . . I can now see better . . . How you do dat ? Now you need to go into a deep benign state of sonambulance and fully use your minds eye to visualize that the WHITE wire terminal is connected to a rotary wiper within the pot...
  15. 73's de Edd

    ST7540 development board

    This is the way ST . . . the main chip manufacturer shows you . . . HOWTODOITTOIT . . . . http://www.st.com/content/ccc/resource/technical/document/application_note/04/f7/63/ef/7f/e8/46/c4/CD00143379.pdf/files/CD00143379.pdf/jcr:content/translations/en.CD00143379.pdf 73's de Edd .....
  16. 73's de Edd

    GE Classic Radio Player 7-4135 schematic and amp question.

    Sir Jason Watkins . . . . . Sooooooo . . . . if you want room SHATTERING volume, it will be dependent upon a remoting out of this units audio via a shielded line to a mo' powerful amp and a like enhanced speaker utilization. Can youse spels volume control . . . .? . . .sure you CAN ! . . ...
  17. 73's de Edd

    BWD 539A oscilloscope

    Sir Bob Johnson . . . . It's in the book . . . . And being on this page ***** That would be a DC level / balance problem in either the X 1 Pin 12 or X2 Pin 10 hoz deflection plates of the units Brimar D13-611 kine. Which in turn, could relate to their differential Q129 and Q130 hoz...
  18. 73's de Edd

    Yorkville 100watt Mixer/Amp - Replaced Transistors

    Sir Jason . . . . . . .Gee R76, R75 - really hot to the touch, can only handle a finger on them for 4 seconds. R88, R89, R90 - same. really hot Observation . . . . R77, R37, R39 . . .should also be saying . . . . me too . . . . ME TOO ! In initially looking at the main power amp section . ...
  19. 73's de Edd

    Digital piano won't power ON

    You are right on the diode . . .I just did not have resolution on the photos that I could find. If you were to take your DVM, using it in its diode test mode, and check the Vf of this diode, it just might mate up close to the voltage that we are seeing at terminals 12 and 13. Good thing that...
  20. 73's de Edd

    Sony STR-DE305 Stereo Receiver/ Amp unit - no display nor output

    There is a schematic error on the voltages on the output transistors bases. What you have is correct . . . proceed to the transistor swap between channels . . . . being sure that the NPN---PNP pair don't accidentally get swapped.
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