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  1. 73's de Edd

    Diode Equivelent

    Sir bgk62 . . . . . I just verified their electrical functions on the SWAN schematic . . . The 38679's could be replaced by 1N5404's if that is what you already have in stock. That would be one step up in PIV rating and + 6x the current carrying capability. I see two of them being used as...
  2. 73's de Edd

    Realistic STA-2100D

    Sir tomcat65 . . . . . Here is the power flow path related to the incandescent STEREO indicator lamp of that unit. Do take note . . . that it is being a small, low power lamp that is only rated at 6V @ 60 milliamperes. Probably being a very small (grain of wheat) type of lamp...
  3. 73's de Edd

    Voltage regulator problem !!

    Sir Omar wahbi . . . . First take a 2,5 cm brush and water and detergent and give the board a thorough scrub from top to bottom to preclude humidity plus the present dust trails causing a conductive mud path between any high voltage and the sensing circuitry over to the right. Circuitry design...
  4. 73's de Edd

    Monitor problem on/off switch

    Sir mrel . . . . . As blurred as it is . . .I can STILL make out tact (tactile) push button switches. A positive test would be to pull one of the LEAST or NEVER used switches to the side and unsolder and swap with that POWER one that gets the constant use. Then you can get a new one if that...
  5. 73's de Edd

    CreativeLabs L3800 2.1 sound system works fine for 20 minutes

    Bass always works but after the 20 mins the satellite / treble and midrange remoted speakers drop out ? Get a fan, set on high, and get it in as close as possible to the circuitry and direct onto the electronics and see if the cooling then gives unlimited run time . . . as compared to the...
  6. 73's de Edd

    Technics SA-818 FM Muting Problem

    Investigate to see if C125 bypass filtering tied into pin 11 has had a decline of capacitance. Also C119 on pin 7... . . . . .C117 pn pin 5.
  7. 73's de Edd

    Diode Equivelent

  8. 73's de Edd

    Diode Equivelent

    Sir bgk62 . . . . . The supplied reference is for parts FAR more bucolic than your parts supplied numbers. The diodes are apparently for AC line frequency rectification of a power supply or power device which is using those parts. The RCA 39804 relates to an axial leaded rectifier akin to...
  9. 73's de Edd

    Emerson MW8779W doesn't heat but turns on!

    Sr Benny7440 . . . . . Well at least I can now give you some more techno info and commend you on your perseverence, as do your countrymen in keeping their classic '57 Chebbys . . . .'55 Fordecitos and '52 Olds-mo-bubbles . . .still a going. Since you blew the fuse, that confirms that you...
  10. 73's de Edd

    Help! Color dropping in and out on 1978 Zenith Chromacolor II television

    Sir LucidusAtra . . . . . Pending further clarification . . . . With your description of the push in to activate aspect of the fine tuning knob, and the separate AFT sw and if your unit looks like this, you have an electronics tuner utilized there and its not subject to 144+ huner contacts...
  11. 73's de Edd

    Yamaha rxv 465 no display and no power..

    Sir Hermant . . . Reference to page 112 VERY TOP , just right off center for the 3.3 VDC main supply and this circuitry which is providing SWITCHED 3.3 VDC In your inspecting of the the missing transistor pcb foil tabs, does it definitely show tell tale solder remnants that suggest of a...
  12. 73's de Edd

    Help! Color dropping in and out on 1978 Zenith Chromacolor II television

    Sir LucidusAtra . . . . . Confirm if this is being the signal path. VCR comes into the Zenith thru the mentioned 300/75 transformer *** and you then either can play a tape or have a Digital converter box coming into the VCR for watching off air digital TV . . . .or . . . . using RCA video...
  13. 73's de Edd

    Yamaha rxv1070 receiver struck by lightning

    Sir Mattydaddy . . . . I certainly don't like the way that display is showing . . . . at all. After having the unit unplugged from the AC line for 30 min or so for initiating a full system reset, since that unit is using a separate 24 series earom for its program memory, and should initiate...
  14. 73's de Edd

    Yamaha rxv 465 no display and no power..

    Sir Hemant Choudhary . . . . . Fine now, with there not being any excessive DC voltage on the multiple voltage sensing transistors that you just tested.. Now lets see why there is only being that short temporary power relay action, and it not latching, and staying on. But you DO need to...
  15. 73's de Edd

    Sony Amplifier TA-AX3

    Sir microlith . . . . . . In the time progression of electronically amplified phonographs / turntables. There were the first vacuum tube models which rapidly had their cartridges evolve to crystal cartridges which were designed to have a very hi voltage output, specifically so that they could...
  16. 73's de Edd

    Successful Stanford Research SR530 lock-in amplifier repair

    Stir Seeve . . . . .(ooooooops . . . it's my dern lysdexia kickin' in agin' ) By the colors . . . . Is the left of this RED area, being any more serious than this portion ? YELLOW . . . . Bet one end of this film resistor is being at nearly 0 ohms to ground.. PINK . . . . .This must be...
  17. 73's de Edd

    Successful Stanford Research SR530 lock-in amplifier repair

    Could your mystical mystery device be associated with the processing of a dual diversity receivers signals . Mariner 69's telemetry signal processing encroached and surpassed that degree of refinement / enhancement. Your adjunct package routing also fully answers the mystical . . . . "...
  18. 73's de Edd

    Are those blown capacitors?

    Sir NikolayM . . . . I'm only seeing " hold down " and " tack " adhesives. The yellow circle is where they made a mod and held down the part. If the control is so bad that it has to be held, that is probably beyond cleaning stage and a mechanical wiper loosening . . . . . . ergo . . ...
  19. 73's de Edd

    Sony Amplifier TA-AX3

    Three input options on the left plus complete tape input and loop thru capabilities Speaker connections over to the right Possibly different AC connections other than these that are being shown . . .with one switched AC outlet at the bottom. What else could there be that you don't "apprehend"...
  20. 73's de Edd

    I've got a switch that i don't know the correct name of. Can someone help?

    Sir WireLord55 . . . . . Nooooooooooooooooooooooo . . . . AND does that show that you NEGLECTED to solder suck /or/ solder wick + rosin flux all of the 18 connections to be able to lift that fiberboard plate and its contacts out ? That is being a VERY-VERY-VERY special 6 pole double...
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