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  1. 73's de Edd

    Digital piano won't power ON

    Sir Alektron . . . . . I took some new pictures, hopefully they will be more clear, if not let me know the area, and I'll do my best. MAGNIFICENT . . . . now my board viewing is not limited to just being a peephole area. (But also strange, as at one instant I had seen the board mounted on a...
  2. 73's de Edd

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

    Sir Chas . . . . . If you will, place metering in ohms function and in the lowest ohms range . . . unless it is doing it for you by being autoranging.. . . then do this test. Place meter leads together and expect a low reading for the short you are creating, open the leads and expect the "1"...
  3. 73's de Edd

    Need to replace an old style Capacitor

    Sir Andy 1066 . . . . . Can you see it here or supply a photo of yours and its marked on specifications. The most common ones are being used for suppressing motor commutator arcing and reducing interference. https://www.google.co.in/search?tbm=isch&slpassthru=1&q=Capacitor For " Singer "...
  4. 73's de Edd

    Coffee machine power issue

    Got that SHINY piece of equipment going again . . . .ehhhh ? . . . . . . .KUDOS !
  5. 73's de Edd

    Denon AVR-1912 E2/EA

    Sir Michael @Studio1. . . . . . Any chance that . . . ITEM 8 . . . is being the cable in question, as I couldn't see any underneath the unit that looked viable as having that dense of count of side by side cabling conductors. Also looks like they have made HARD foldovers to that cable at two...
  6. 73's de Edd

    What are these 2 "extra" red wires for? Li-Ion RC Battery

    Repeating again . . . .one mo' time . . . . CLOD . . . IS . . . . CLOUD . . . .if you have made a fast typo.
  7. 73's de Edd

    What are these 2 "extra" red wires for? Li-Ion RC Battery

    Herr YOU-NOW-NOES. . . " clud " . . . . . icht bin undt " C'herman " . . . cloud.
  8. 73's de Edd

    Denon AVR-1912 E2/EA

    Sir Michael @ Studio1 . . . . . You say you are short of negative 8 VDC supply on pin 52 of IC801. That IC801, located on the AV1/3D1 board, gets it negative 8VDC supply from either of the dual pins of 16 or 17 of the CP14 connector and your ground reference is being the AGND of its pin...
  9. 73's de Edd

    Digital piano won't power ON

    Sir Alektron . . . For point " I " I couldn't do any testing, since Diode #19 is totally missing from the PCB. I took a measurement from Diode #13 it was like 500 mV. There must have been a production change, as this is a minor supply, as it starts, at the left, it is taking its initial power...
  10. 73's de Edd

    Old rca trouble

    Sir Hsetech70 . . . . . How far have you traveled down this path, with final concern, of all of its voltage supplies being there and correct ? https://antiqueradio.org/RCAT-100Television.htm 73's de Edd .....
  11. 73's de Edd

    Rotel rx203 receiver

    Sir Terryb . . . . . I feel that your situation is 43 years of time and possible tension decrease of 2 coil springs, plus a dial cord polishing plus 3 1/4 turns of coils of loops of the dial cord around a 1/4 inch tuning knob shaft. With the day one condition of that tuning shaft being a...
  12. 73's de Edd

    Repairing an Old Turntable?

    Mme Sarah . . . . I associate your stock photo with coaxial cable If this Record players phono cartridge output is being connected to a male RCA plug, I suggest getting a patch cord such as being used to interconnect TV-VCR's -Cassette players -Video players, etc. Reading its packaging . ...
  13. 73's de Edd

    Digital piano won't power ON

    Sir Alektron . . . . . . I believe that after reading your RED LINED connector info, that we can assume that your +15 and -15V supplies are being good, and now you can track the component trail from A up and to the right to DDD. I might equally assume that your voltage drop situation of 34V...
  14. 73's de Edd

    Identifying diode

    Sir Viktor . . . . . All right . . . .please further enlighten me with your forthcoming answer. Below . . . . FIRSTLY . . .I am seeing the MOST . . . BEE-YOOT-I-FULL . . . tinned and flux free end caps that one could fully EVER expect to see on a . . . . resistor ? The basic color of...
  15. 73's de Edd

    Digital piano won't power ON

    Sir Alektron . . . . . Relevant to your lower AC voltages from the power transformer secondary windings, if they are reading high that could be indicative of some connector is not plugged in, so that a portion of the loading of the supply transformer is not there, so the voltage would be high...
  16. 73's de Edd

    Digital piano won't power ON

    Sir Alektron . . . . the Super CAP had continuity in both direction. In one direction continuity was always there (between + and - ), in the other direction continuity stopped after a while. In one manner, where you had the ohmmeters polarity being connected backwards the cap showed leakage...
  17. 73's de Edd

    Adding line in to AN7465S Multiplexor

    Sir clipper . . . . . At the circuitry position and the level that you were injecting your audio . . .along with the impedance mismatch . . . you basically had yourself a quasi-audio square wave generator. Consult the info below on your unit to find the two 22K load resistors and my mark ups...
  18. 73's de Edd

    Motorola Transistor Replacement

    Sir Kepo . . . .et Jorgo . . . . Post 16 Looks fine to me . . . . if having no minor wire color coding, nor erroneous terminal connections If you have a TR4 POWER TRANSISTOR failure, it would relate to getting either no or excess voltage to the trim motor/actuator. If you have a TR2 POWER...
  19. 73's de Edd

    Denon AVR-1912 E2/EA

    Sir Michael @Studio1. . . . . . Back at my last posting I did not have this info available IC 108 is a 4pin 2388 Low Dropout Voltage Regulator. IN = +12.43V OUT = +8.957V IC 103 is a 3pin 7805A Positive Voltage Regulator. IN = + 10.29V OUT = +5.1V. IC 104 " " 7905A Negative " " IN = - 0.00V...
  20. 73's de Edd

    Denon AVR-1912 E2/EA

    Sir Michael . . . . . Looking at any involved CX102 wiring routes, it looks like it is only being related to the female AC line socket, and then with one wiring routing being directed to one of the MAIN /heavy linear power transformers primary winding, and the other CX102 wiring route is...
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