Marantz 2325 experts please

Discussion in 'Marantz Audio' started by Echoplex, May 6, 2018.

  1. Echoplex

    Echoplex AK Subscriber Subscriber

    Messages:
    152
    Yes, I was afraid of that. It'll definitely be on the list for P800 updates.

    Ok, will do! Yes, will definitely be checking each resistor carefully.

    Well....found something else on PE01 that needs replaced. RE11 resistor that sits right behind BA312 looks like it's been repaired from the top; right where the lead joint bend is, there's a dab of solder on it that looks like someone cut it, then repaired it. Strange...

    Guess this is what I get for being curious huh? No good deed goes unpunished! :D What started out as a simple repair has now turned into a full blown overhaul!

    Makes sense, especially with all the power up/power down cycles..maybe at the front is better? Hmmm....Looks like I've got some reading and researching to do.
    For now, they'll stay as is.

    Yes, will be updating PE01 with lots of Wimas for sure! They seem to have quite the repuation here, and it has my attention.

    Thanks much for all the helpful advice!
     

     

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  2. Echoplex

    Echoplex AK Subscriber Subscriber

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    Excellent! Love reference photos and diagrams....really speeds up the learning process!
    Sure thing....keep'em coming! Thanks much;)
     
  3. wurlyman

    wurlyman Active Member

    Messages:
    223
    Location:
    Sacramento, CA
    Here's my PE01 board as it is now. I will soon be replacing the BA312 op-amps (IC chips) with a new modification that I've just purchased.

    _DSC0094a.JPG
     
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  4. Echoplex

    Echoplex AK Subscriber Subscriber

    Messages:
    152
    Yes, I've been checking these out as well.:)

    Looks like it will be a nice upgrade; lower noise floor and flatter frequency response from the plots posted on Sparko Labs website. Definitely convenient...smaller module boards for essentially a drop-in replacement.
    [​IMG]


    I’ll be interested to hear your review on the results. Please keep us posted.
     

    Attached Files:

    Last edited: May 10, 2018
  5. wurlyman

    wurlyman Active Member

    Messages:
    223
    Location:
    Sacramento, CA
    Yes, it is simple. Requires removing 8 resistors, 2 caps and replacing 4 caps and 1 resistor and of course the Op Amps. I'll post it after it's done.
     
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  6. Echoplex

    Echoplex AK Subscriber Subscriber

    Messages:
    152
    Well, got my parts in for the P700 boards yesterday.

    Time for R719/R720 to get some new resistors. Also, going to be replacing the zener diodes w/3W versions.

    Was thinking that it might be a good idea to use ceramic tube insulators this time around because the heat shrink was pretty cooked on the originals. Or, is it even necessary since the new ones are rated higher?

    Also, after swapping the new ones in, will I need to make any adjustments to P700 before powering up? Thx!
     

     

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  7. wurlyman

    wurlyman Active Member

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    223
    Location:
    Sacramento, CA

    Here's how I did mine. You might re-check bias as per service manual.
     

    Attached Files:

  8. Echoplex

    Echoplex AK Subscriber Subscriber

    Messages:
    152
    Will do. Thx!
     
  9. catrafter

    catrafter Marantz Specialist Subscriber

    Messages:
    6,035
    Location:
    Montana
    20V 3W zeners
    1N5932BRLG
    Thanks to Echoplex for mentioning these.

    Tom
     
  10. wurlyman

    wurlyman Active Member

    Messages:
    223
    Location:
    Sacramento, CA
    Tom, I didn't replace those. What is the purpose? it wasn't brought up when I was doing my rebuild.
    Thanks,
    Stu
     
  11. catrafter

    catrafter Marantz Specialist Subscriber

    Messages:
    6,035
    Location:
    Montana
    I am always learning and trying to 'up' my game.
    I have only seen the original zeners fail under the conditions in this post. It is interesting that some Marantz documents reference H716 and H717 as BZ parts and others reference them as CZ, which has a higher power rating.

    Tom
     
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  12. Echoplex

    Echoplex AK Subscriber Subscriber

    Messages:
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    Progress! Got the new resistors and zeners put in on both amp modules tonight.
    Thanks to Tom (catrafter) for the advice.

    Pansonic Metal Oxide Resistors
    1.2k Ohm 3W
    Mouser Part #
    667-ERG-3SJ122
    P700 locations R719/R720

    On-Semiconductor Zener Diodes
    20V 3W
    Mouser Part # 863-1N5932BRLG
    P700 locations H716/H717

    [​IMG]
    [​IMG]


    Check out the old resistors from R719 locations @ bottom of photo...pretty cooked!
    [​IMG]
     

    Attached Files:

    Last edited: May 13, 2018
  13. Leestereo

    Leestereo Super Member

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    2,023
    Location:
    Ottawa, ON
    We're all in that boat, I think...
     

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