Now it's time to ...

Discussion in 'Yamaha' started by amr2, Mar 20, 2018.

  1. amr2

    amr2 Active Member

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  2. Blue Shadow

    Blue Shadow I gotta get me a new title

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    19,720
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    looks like some serious cleaning and detailing on those units before it is time to do much of anything. Enjoy getting intimate with your new amps.
     
  3. BOUXY

    BOUXY Super Member

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    4,603
    Location:
    WPG,MB CANADA
    Clean clean and then some more CLEAN:)
     
  4. amr2

    amr2 Active Member

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    480
    Yes. It needs a lot of cleaning! I’m going to restore them as best I can. ;)
     
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  5. parman

    parman Member # 78,336 Subscriber

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    worse than Detroit
    NICE!!!!
     
  6. rottalpha

    rottalpha Yamaholic Subscriber

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  7. amr2

    amr2 Active Member

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    I'm going to add a speaker protection module inside. Something compact that can be added elegantly.
     
  8. SoCal Sam

    SoCal Sam Lunatic Member

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    17,703
    P2200's!!
     
  9. bmanone

    bmanone Active Member

    Messages:
    117
    Location:
    Calico Rock, Arkansas
    amr2,
    I've repaired and refurbished two P2200s, one had a intermittent popping sound after the repair. Traced the problem down to some counterfeit transistors (tested OK on the cheap transistor tester), see picture below. Both of my P2200s sound really good, they are my favorites. I didn't add speaker protection, but I did a couple of 2 amp inline fuses to my speaker cable, I hope it's enough protection. Looking forward to seeing what you do for speaker protection. counterfeit.jpg
     
  10. amr2

    amr2 Active Member

    Messages:
    480
    counterfeits....:no: A couple of weeks ago I repaired an amplifier, somone tried to repair it before. And I found this:

    BF245A, N-channel silicon field-effect transistor:

    IMG_4842.JPG

    About the protection, I already have the modules, one per channel. I'll put them next to the output connectors, reversibly and without modifying the chassis. I hope to upload some pics soon.
     
  11. asdf_x2

    asdf_x2 Active Member

    Messages:
    166
    Location:
    Finland
    I'm also looking forward to seeing your protection circuit placement. I just recently got a P2201 (a P2200 without the meters) and have been wondering how to retrofit a DC protection/delay circuit in it.
     

     

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  12. Mrvintage

    Mrvintage New Member

    Messages:
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    Location:
    Parry Sound Ontario Canada
    Good evening
    I have a complete 22 page service manual for P2200 if that will help in your Yamaha project. I have 3 P-2200 I’m building a vintage system with
     
  13. amr2

    amr2 Active Member

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    480
    The speaker protección modules. One for each channel

    769A1B99-1E06-4F72-B458-64CDD8F403A9.jpeg
     
  14. bmanone

    bmanone Active Member

    Messages:
    117
    Location:
    Calico Rock, Arkansas
  15. amr2

    amr2 Active Member

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  16. bmanone

    bmanone Active Member

    Messages:
    117
    Location:
    Calico Rock, Arkansas
    I saw that unit when I was looking, I think it'll work great. Do you know how much current it'll draw? Do you plan to use an inline fuse? I thought about using the BE lines, I was just a bit concerned about the current draw (should be small though, relay coil draws 77mA) and injecting noise into the amplification stage.
     

     

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  17. amr2

    amr2 Active Member

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    I have to check it, but I think the current draw should be low, less than 100mA, and noise shouldn’t be a problem.

    I did not plan to use an inline fuse.
     
  18. bmanone

    bmanone Active Member

    Messages:
    117
    Location:
    Calico Rock, Arkansas
    Installed my speaker protection boards yesterday, I ended up using BE (13V. AC) to power the modules. Here are some pictures of right side installation (left side was complete first).

    Speaker Protection Board

    Locating the Board

    Mounting holes drilled and tapped

    Rubber insulator sheet

    Screws and spacers in place on board

    Board Mounted

    Board wired

    Board wired to speaker terminals, BE ac power, and right amplifier board

    Protection Board installed showing clearance to amp board


    The P2200 works great with the protection board installed. No more turn-on pop, no more playing on after the unit is powered off, and lastly no more worry about excessive dc offset causing speaker damage. This board does not protect the amplifier from dead shorts across the speaker terminals.
     
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  19. amr2

    amr2 Active Member

    Messages:
    480
    Excelent work Barry! This is how I plan to place the modules.

    BTW, what capacitors have you used to recap the boards? Panasonic FC?
     
  20. bmanone

    bmanone Active Member

    Messages:
    117
    Location:
    Calico Rock, Arkansas
    Alberto,
    Thanks, I used Panasonic FC's:
    4 x P10352-ND EEU-FC1J471 CAP ALUM 470UF 20% 63V RADIAL
    4 x P10301-ND EEU-FC1V471 CAP ALUM 470UF 20% 35V RADIAL​
    Vishay axial:
    2 x 4245PHBK-ND MAL213818221E3 CAP ALUM 220UF 20% 63V AXIAL​
    EPCOS (TDK) Film:
    2 x 495-5047-1-ND B32529C0474J189 CAP FILM 0.47UF 5% 63VDC RADIAL​
    Nichicon Aluminum Poly:
    2 x 493-3711-ND RR71A101MDN1 CAP ALUM POLY 100UF 20% 10V T/H​
    I also replaced the common anode and common cathode diode arrays with these Schottky types:
    2 x 1655-1098-ND MBRF10150CTR DIODE ARRAY SCHOTTKY 150V ITO220
    2 x 1655-1097-ND MBRF10150CT DIODE ARRAY SCHOTTKY 150V ITO220​
    I had 3 of 4 (D114 and D115) diode arrays fail on one of my P2200s. These SCHOTTKY diodes have the added benefit of a lower voltage drop to rectify BE, offsetting the voltage drop cause by the speaker protection boards!
    Hope this helps with your project!
    Barry
     

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