My Marantz 2230 Rebuild Thread

Discussion in 'Marantz Audio' started by tensleep, Mar 30, 2017.

  1. runningdog

    runningdog AK Subscriber Subscriber

    Messages:
    310
    Location:
    Sonoma, CA
    They are non polarized, they can go in either way.
     
  2. Oerets

    Oerets AK Subscriber Subscriber

    Messages:
    9,675
    Location:
    Derby City U.S.A.
  3. tensleep

    tensleep AK Subscriber Subscriber

    Messages:
    7,115
    Location:
    Dallas Metroplex
    IIRC, diodes block DC in one direction, pass in the other, half-wave rectification for AC, thereby conducting and emitting light for half a wave. Since I don't know if we are dealing with AC or DC voltage in this application, I assumed AC, since no direction was specified in the directions. I took the easy way out and asked, rather than analyze the circuit.

    Legs are equivalent length, one is heavier gauge than the other. I appreciate the link and will inspect the plates when I get back home from work tomorrow for my own education.

    My original question should have read are these going into an AC or a DC circuit - again, my transistor theory is a bit rusty. That's why I love AK! Great safety net.
     
  4. Oerets

    Oerets AK Subscriber Subscriber

    Messages:
    9,675
    Location:
    Derby City U.S.A.
    They are in series IIRC so if no light reverse one or both.

    Yes they do block when reverse biased. A reason the link was supplied before.


    Barney
     
  5. runningdog

    runningdog AK Subscriber Subscriber

    Messages:
    310
    Location:
    Sonoma, CA
    The stereo lamp circuit is DC. And the stereo lamps are in series, regardless of the schematic. The rest of the lamps are on an AC circuit straight off the transformer.

    The LED lamp assemblies that you have will work inserted either direction on both AC and DC circuits.
     
    tensleep likes this.
  6. tensleep

    tensleep AK Subscriber Subscriber

    Messages:
    7,115
    Location:
    Dallas Metroplex
    So the assemblies are more complex than just a simple LED? The ones that go into the fuse type holders are obviously more complex. I am talking about all the 8V lamps that "look" like a simple LED in a base.
     
  7. tensleep

    tensleep AK Subscriber Subscriber

    Messages:
    7,115
    Location:
    Dallas Metroplex
    Also, will the old vellum adhesive on the plastic lens soften if soaked overnight in soapy water?
     
  8. Oerets

    Oerets AK Subscriber Subscriber

    Messages:
    9,675
    Location:
    Derby City U.S.A.
    With a LED you need to have the current/voltage right. I have used them mot=re then a few times to replace stereo indicators.
    Just need to do more then place one in. A resistor maybe a diode depending on flicker.
    Guessing 150ohm.....


    http://ledcalculator.net/



    Bareny
     
    tensleep likes this.
  9. Oerets

    Oerets AK Subscriber Subscriber

    Messages:
    9,675
    Location:
    Derby City U.S.A.
    Never tried that. Just removed the old and used a razor blade to clean it up. Let me know how it works.


    Barney
     
  10. tensleep

    tensleep AK Subscriber Subscriber

    Messages:
    7,115
    Location:
    Dallas Metroplex
    Yes, that is true, but I believe that these aren't simple LEDs supplied in this kit. I believe all of the engineering has already been done by my supplier - just getting confirmation.
     
  11. Bert 1100

    Bert 1100 Super Member

    Messages:
    1,051
    Location:
    Planquiri !
    The leds need to be installed correctly polarity-wise. The longer leg usually is positive. since there are 2 in series, you need to go : positive feed to / + led - / / + led - / to negative feed
    And you need a resistor in series to drop the current, depending on what leds you use. A value of around 1K to start with, measure the current and then change the resistor as needed or if you find the light too bright.
    The leds I use have a nominal current of 20mA.
     
  12. runningdog

    runningdog AK Subscriber Subscriber

    Messages:
    310
    Location:
    Sonoma, CA
    Here's what one widely sold modern bi-pin LED lamp assembly looks like naked. You can see the resistor is hand-soldered in place and forms one leg of the lamp assembly. The complete assembly installs without any additional components needed. The manufacturer refers to these as "AC" and they are not polarity sensitive.

    LED lamp bi pin naked.jpg
     
    KeyserSozee and tensleep like this.
  13. tensleep

    tensleep AK Subscriber Subscriber

    Messages:
    7,115
    Location:
    Dallas Metroplex
    A picture speaks 1000 words - this is what I thought!!!
     
  14. Bert 1100

    Bert 1100 Super Member

    Messages:
    1,051
    Location:
    Planquiri !
    Isn't the stereo lamp feed DC ? If so, the polarity still needs to be observed...
     
  15. runningdog

    runningdog AK Subscriber Subscriber

    Messages:
    310
    Location:
    Sonoma, CA
    The stereo lamp circuit is DC. However the lamps that the OP has are not polarity sensitive and can be installed in either direction. This can be tested with a nine volt battery or another DC power supply.

    LED lamp bi pin powered 2.JPG LED lamp bi pin powered.JPG
     
    tensleep likes this.
  16. runningdog

    runningdog AK Subscriber Subscriber

    Messages:
    310
    Location:
    Sonoma, CA
    Here's the diode without the resistor lit up both ways.

    LED lamp bi pin no resistor 2.JPG LED lamp bi pin no resistor.JPG
     
    tensleep likes this.
  17. tensleep

    tensleep AK Subscriber Subscriber

    Messages:
    7,115
    Location:
    Dallas Metroplex
    Thought about hooking it up like that to test it. I may do this when I get a chance. I have been at work for 14 hours today, still going, or I would have finally finished this receiver.
     
  18. catrafter

    catrafter Marantz Specialist Subscriber

    Messages:
    5,878
    Location:
    Montana
    AFAIK, IRM LEDs are bipolar and will light with either polarity. Most LEDs from the usual suppliers are polarity sensitive.

    Tom
     
  19. tensleep

    tensleep AK Subscriber Subscriber

    Messages:
    7,115
    Location:
    Dallas Metroplex
    15052670899362819719198723822078.jpg 15052671635986866054236648769529.jpg 15052672547132311287731235836185.jpg 15052674778631576607352718254162.jpg 15052702069917656854802019548161.jpg 15052702475791626033636644533225.jpg 15052704130865064795583099149541.jpg 15052704704227710004010873374605.jpg

    I'll finish the face tomorrow and set the voltage levels. These lights are gonna be pretty!!!!
     
    satellite likes this.
  20. satellite

    satellite AK Subscriber Subscriber

    Messages:
    430
    Location:
    Boise Idaho
    Great documentation! I have a good working 2230 with a new light kit waiting to be installed. What are you using for your new vellum paper? Did it come with your kit?
     
    tensleep likes this.

Share This Page