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  1. 73's de Edd

    Identifying parts of the FM kit

    Sir *Neon23 . . . . . The CXA prefix is usually associated with Sony IC's. And now I give you this utilization of a CXA1019 just for comparison. You can see that they seem to fall in pin by pin. Take particular note of the first few pages where they break down the pin by pin internal...
  2. 73's de Edd

    Yamaha rxv 465 no display and no power..

    Sir Hemant Choudhary . . . . . That systems dual polarity, DUAL LEVEL power supply shifts up from the low level, which you currently have, to the full supply level after the filters take on their initial charge. This is being accomplished by RY100 and its Q1016 driver, at the top of the...
  3. 73's de Edd

    Philips Oscilloscope Type PM 3206. Service Manual

    Sir Gopakumar . . . . . I just hope that this unit did not end up coming from, and being stored for decades in an old MAERSK shipping container in Bhubaneswar. Where its HOT-HOT-HOT and 118% humidity . . . with the added extra . . . from not having mere beads of sweat . . . but a continuous...
  4. 73's de Edd

    Internet schematic OK

    Sir Tedstruck . . . . . With " the rest of the story ". . . .and using with an 80-100 watt panel . . .and don't "over expect", even with that. It certainly seems so. 73's de Edd .....
  5. 73's de Edd

    Tek 475 scope

    Sir Corri . . . . . After initially finding that you are Amerikanski . . . .and will be using 120VAC power. . .along whth that ohms reading across the primary of the power transformer . . . .is looking as normal. MY next step would be to switch DVM to AC metering mode and measure the line...
  6. 73's de Edd

    Philips Oscilloscope Type PM 3206. Service Manual

    Sir Gopakumar . . . . . Had to think about that old one one a bit . . . . .then definitely decided that it just chronologically fell BOTH in the POST Neanderthal and Cro magnon periods and then came up with this . . . https://elektrotanya.com/philips_pm3206_oscilloscope_sm.pdf/download.html...
  7. 73's de Edd

    SONY Treble button issue

    Sir Rick79 . . . . . All its mass inter page complexity, is now simplified down to a one page UNITIZED draw out . Initially take note of the left IC1601 System Control and its pins 38----41 as being its Analog to Digital conversion inputs and each is receiving a voltage reference from the...
  8. 73's de Edd

    Yamaha R-8 receiver drops memory at power off

    Sir Mickey Trageser . . . . . IT"s IN THE BOOK . . . . . .By Johnny Standley . . . .and I just happen to have THAT relevant Yamaha book ! One each .047 FARAD 5.5 VDC Super Cap, being needed, and I would replace the old C179 shunting it. Just find 42 pin IC108's . . . . . pin 40 and track...
  9. 73's de Edd

    Pcb not working?

    Sir Stevehawk . . . . . If those are being black spots where the foil path has vaporized at those points, there is some serious power passing in that circuitry in order to do that, and a fault somewhere within the power loop. Take DVM in hand and turn it on and place in its lowest ohms mode...
  10. 73's de Edd

    Low end, how to work with flicker LEDs on 1.5v

    Sir the13bats . . . . . . . .aka . . .a baker's dozen of bats . . . . I would make any comment . . . . . only after you have digested all of the info found at . . . . . https://www.evilmadscientist.com/2011/does-this-led-sound-funny-to-you/ PLUS . . . . . 73's de Edd .....
  11. 73's de Edd

    Need Help regarding Yamaha RXV371. No Sound Output

    If it was the loss of the +7 VDC supply it must have been the R1326 fusible resistor, D1309 FWB rectifier pack or the C1320 electrolytic storage capacitor.
  12. 73's de Edd

    Resistor Value.

    I only selected that schematic, because it had so much in common with what he is working with. FOR THE CIRCUITRY TO THE RIGHT OF THE SM POWER TRANSFORMER AND THE RIGHT OF THE OPTICAL ISOLATOR. That is not my draw, and the only fault, I see is that who ever drew it used the familiar ground symbol...
  13. 73's de Edd

    Squawk Box

    Sir Kim . . . . . How close are you to having motor drive and remote action again ?. If that was my unit to repair I would be using a paralleled pair of 18650 li Ion cells for motor power with 3.7 VDC and a whole day or more of run time. If those motor drive transistors don't warm up, I would...
  14. 73's de Edd

    EP-613 linear reg. power supply ,looking for service manual or schematics.

    That's why I asked of the design . . . I have seen both types. A unit using a giant transformer for a linear AC power supply OR a unit with switch mode technology and ferrite power transformers.
  15. 73's de Edd

    Resistor Value.

    Sir Constantine . . . . . Looks like your unit circuitry is just a POWER oscillator that drives the transformer , and uses no IC's. It's probably using that other single small signal bipolar transistor in assisting in clamping down the base drive level to the power output to regulate the...
  16. 73's de Edd

    Troubleshooting Obsolete Snap-On Motherboard (unidentifiable IC's)

    Sir MtnMann . . . Have you got the WHOLE unit ? Sort of looks like it interfaces thru a solenoid / pick up coil. Read this, and see what you can further full us in on . . . . http://www.icantclick.org/gallery2/d/91534-1/WB230_WB240+users+manual.pdf 73's de Edd ...
  17. 73's de Edd

    EP-613 linear reg. power supply ,looking for service manual or schematics.

    SIr dorke . . . . . How about checking to see if that basic design is using tandem 3055 transistors as the pass transistors and is based upon a 723 chip as the regulator and its variable aspects.. 73's de Edd
  18. 73's de Edd

    Resistor Value.

    Sir Constantine . . . . Your initial repair must have had some serious damage by the looks of the parts which you replaced . Does it now pass the initial power up test, when using a 60 watt lamp in place of the fuse? What is the identification of the heatsinked special power IC being seen...
  19. 73's de Edd

    Guitar synth fails self test

    Sir glen . . . . . If all of the Rockin' Rolands very special bells and whistles operate and it's just very low audio . . . . . . All roads tend to lead to Rome . . . . and to Adobe page 14 and its IC46 . . . . .TDA1313T . . . with its inputs and outputs and as to to whether Q24, 25 and 29...
  20. 73's de Edd

    Resistor Value.

    Sir Constantine . . . . . That's strange . . . . as it Fotie-grafs as . . . . GREEN-BLACK-BLACK-GOLD-BLACK. Can you do a light central area paint scraping and then read from either lead end to center point . . or quarter point and then get an ohmmic reading, to then use that to interpolate...
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