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  1. 73's de Edd

    What kind of diode is this?

    M . . . . on powering up the LED emitter . . . . . does it seem to be generating visible or IR light . . . .without me consulting its data sheet . . . . since you already have one out ? Pause . . . . . . . . quickly confirmed as being I.R.
  2. 73's de Edd

    Emerson MW8779W doesn't heat but turns on!

    On the control panel PCB is it using a 42 pin uProcessor and is there a Daewoo board marking anywhere on the PCB ?
  3. 73's de Edd

    Denon AVR-1912 E2/EA

    If you read improper polarities right at the 7000 series voltage regulators, and if you are using an autoranging meter, will you now look down and check the leads plugging into the meter to see if they might be reversed there ? ( ¿¿¿ BLUSH-BLUSH ??? ) Then . . . pull out a standard 9V...
  4. 73's de Edd

    Pioneer SA-505 clicking

    Tir Sooter . . . . . . . .drats! my lys-dexia's kicking in again . . . don't ever grows olds ! I was just initially covering ALL aspects in the testing of BOTH of those diodes, not really expecting any fault with those diodes,as it would require a RARE opening of a diode junction to have a...
  5. 73's de Edd

    Denon AVR-1912 E2/EA

    Sir Michael . . . . . I just didn't initially include all of the +8 and -8VDC supply connections terminations. In this one, the top center is where the + and -8VDC supplies have their origins at their respective regulators. I just can't perceive of the misread of polarities . . . . start...
  6. 73's de Edd

    What kind of diode is this?

    Sir Leggyownz . . . . . Referencing to your Photo #1 and in reading the board, it looks like power +5vdc ? feeds from R1 to power up the light emitter LED on the " D1 " unit and the photo transistor feeds back to U1 then the U1 logic output goes up to pin 1 of your 3 pin connector. Just...
  7. 73's de Edd

    My Metal PSU is leaking electricity and its short in DC voltage

    Sir Sashikanta . . . . . You say . . . Earth, -V +V all showing current, I checked it through tester. The only thing that I might / can interpret from this language / explanation is possibly you are taking a DVM and placing in AC mode and referenced from a good earth ground, with you then...
  8. 73's de Edd

    Pioneer SA-505 clicking

    Sir tooter . . . . . Back on day one you say " i tested the voltage on the board across the pins where the relay actuator lives and I get 48v " The next relay info was being after replacing the relay I can only measure 6v across the relay On your last requested test, you then came up with...
  9. 73's de Edd

    Yorkville 100watt Mixer/Amp - Replaced Transistors

    Sir Jason . . . . . . .Geeeeee Here are the inputs for the tone. The signal lead could go to the same options of: The base of BC560 . . . . Q16 Or bottom lead of 100K . . . . . RA16 Or that bare jumper wire that is between the two green pads. Audio ground could go to the top lead of 100K...
  10. 73's de Edd

    RCA TV Back-light inverter.............

    Sir Mike Estes . . . . . Whaaaaat . . . . .nobody wanna talk 'a to you ? I just can't turn down another fellow Amerikanski . . . It certainly looks like RCA, Toshiba and Samsung are all using that same common "Samsung " board. Now I hear Alba and Technika and Proscan and Element and Dynex are...
  11. 73's de Edd

    Digital piano won't power ON

    Sir Alektron . . . .et al . . . Indeed, at the frequencies and fast and short pulses involved in that circuitry, that IK electrolytic, and having its ESR, would only be as effective as a 10 or 22 ufd cap. Also, check the 10 ufd squirrely one out of circuit. STRANGELY enough, Punysonic was...
  12. 73's de Edd

    Yorkville 100watt Mixer/Amp - Replaced Transistors

    Sir Jason . . . . . . .Geeeeee A continuance . . . OK on the test tone capability. Lets go to the RA16 base resistor at the BC560 at the input of the Audio Power Output stage and couple a tone into that with a ground at that bottom side of the resistor and use an isolative 0.1 ufd cap at the...
  13. 73's de Edd

    Denon AVR-1912 E2/EA

    Sir Michael . . .et al . . . . OBSERVATION and CONFIRMATION . . . . Your D800 diode IS being just a common 1N4007 diode that is used in a steering diode function and comes from the REG_CNT 2/4 G10 as A+8V and then imparts the ~0.7VDC voltage drop across itself and then has that power line...
  14. 73's de Edd

    Pioneer SA-505 clicking

    Sir tooter . . . . . Here is a condensing of the whole schematic to only your particular areas of interest. Initially find your relay that was tested and then follow the yellow brick road . . . . . .errr . . . . RED arrow path, back to its dedicated power supply source. Apply the AC power...
  15. 73's de Edd

    Need help reading a rectifier diode.

    Sir anistorian . . . . Your probable only hope is to know / find and give us the brand and model of stereo . . . for parts researching to its probable "D" numbers that are related to the diode parts in question. Probably those are being equivalent "generic" 1N4001-----7 diodes at a 1 amp...
  16. 73's de Edd

    Yorkville 100watt Mixer/Amp - Replaced Transistors

    Sir Jason . . . . . . .Geeeeee O.K. then . . . . that maintaining of the differential pair of voltages . . .equally . . .as well as their same degrees of loadings, allays that suspicion of a "lazy" filter capacitor of a conjunct power supply pair. I now leave this for you to muse over...
  17. 73's de Edd

    Pioneer SA-505 clicking

    Sir tooter . . . . . One lead of your RY1 / ASR107 relay, that you just had pulled, has one coil connection going to the collector of its Q405 driver transistor, while its other end coil end should go to R414 which is a 820 1 watt resistor. So, using the emitter of Q405 as your metering...
  18. 73's de Edd

    AEG Lavamat W830 washer - control card

    AHHHHH, yes . . .they just got in a new shipment . . .dis mornink . . . so they must be fresh . . . . . http://pdf.datasheetcatalog.com/datasheet/SGSThomsonMicroelectronics/mXywxqt.pdf
  19. 73's de Edd

    Weller EC1002 Repair

    Sir Jim Oliver . . . . How come I can't remember everything ! from all ! times ? On one of my older Weller units, it was just a plastic nut from the inside that held the connector. On yours I believe that it is now dependant upon 2 tapered tabs that are molded on the connector. If you were...
  20. 73's de Edd

    Digital piano won't power ON

    Sir Alektron . . . .et al . . . Why not figure out where you are going to source the new diode from and check their solder offerings and we can comment upon the possibilities that they offer. It's absolutely normal for me to scavenge 70-80's vintage " free " electronics boards to harvest...
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