Marantz 2275 Recap & more

Discussion in 'Marantz Audio' started by Golanr, Mar 24, 2018.

  1. wlhd1610

    wlhd1610 Penny and her new friend Sponsor Subscriber

    Messages:
    2,422
    Location:
    Catskill NY
    Push in the "muting" switch.
    That wire feeds a multitude of boards and switches.
    Like Kyle says I'll bet it got pinched somewhere.
    Maybe pinched under the PE01 board shield below the pushbutton switches board.

    Bob
     

     

    Please register to disable this ad.

  2. Golanr

    Golanr AK Subscriber Subscriber

    Messages:
    96
    Location:
    Chesterfield, MO
    Thank you Kyle and Bob.
    Yes, I did try one at a time, each gave me a funky reading. When all were disconnected, J806 gave me the proper voltage.
    As suggested, I’ll look for pinched cables and test ground as well. It’s strange cause all other inputs, including Phono, work perfectly. Stay tuned.
     
  3. Golanr

    Golanr AK Subscriber Subscriber

    Messages:
    96
    Location:
    Chesterfield, MO
    Did some testing today and did not make progress.
    Started with testing resistance between the 13.4v wire and ground. The fluke did not budge. Like I didn’t even connect the probes. So I set the fluke to VDC and turned my unit on. 13.4v what the hell?

    I tested all other 13.4v wires separately, 3 gave me more than 1.5ohm but the one going to the FM mute button gave me 0.458ohm in the off position and 0ohm in the on position. I looked at the wires and they looked fine, I tried the wiggle the board....nothing changed. Looking for more ideas :dunno:
     
  4. wlhd1610

    wlhd1610 Penny and her new friend Sponsor Subscriber

    Messages:
    2,422
    Location:
    Catskill NY
    Disconnect the feed off of J806 and put your ma meter on J806 and on the wire to see how much current is flowing .

    Bob
     
  5. Golanr

    Golanr AK Subscriber Subscriber

    Messages:
    96
    Location:
    Chesterfield, MO
    Thanks Bob! Let me see if I got it right.
    1. Disconnect the feed off of J806 - OK
    2. Set my fluke to ma and put the red lead on J806 put the black on which wire? The one I disconnected from J806?
    3. Do I test it while the 2275 is on or off? I assume on?

    Thank you
     
  6. wlhd1610

    wlhd1610 Penny and her new friend Sponsor Subscriber

    Messages:
    2,422
    Location:
    Catskill NY
    Yes power on
    You're just putting your dvm in series with the wire you pulled off of J806 to see how much current it's pulling which should tell you one of two things:
    1) very little current which could indicate the P800 14vdc supply is suspect
    2) relatively high current which probably means you have a shorted wire somewhere since you have already disconnected every board simultaneously.

    I'm still betting on a short somewhere.

    I would go to the small terminal board under the chassis that's just behind the preamp board but in front of the P200 board and separate all 5 or 6 wires there that feed out to the rotary switched ,pushbutton switches and boards .
    You should be able to isolate which of the wires is dragging down your voltage.

    Bob
     
    Golanr likes this.

     

    Please register to disable this ad.

  7. Golanr

    Golanr AK Subscriber Subscriber

    Messages:
    96
    Location:
    Chesterfield, MO
    Thanks! I'll do that tomorrow.
    About the small terminal board, do you mean H005?

    Screen Shot 2018-04-10 at 10.07.49 PM.png
     
    Last edited: Apr 11, 2018
  8. rBuckner

    rBuckner Luv 2 Restore Subscriber

    Messages:
    9,613
    Location:
    Prescott, Arizona
    Nope, that's the power rectifier to feed the power amps. I think it's the terminal strip just to the left of that and just a tad lower. The bunch of wires are usually orange in Marantz receivers but may be red in a 2275. I haven't done one in quite awhile.
     
    Golanr likes this.
  9. Golanr

    Golanr AK Subscriber Subscriber

    Messages:
    96
    Location:
    Chesterfield, MO
    Thanks @rBuckner

    OK, so it's the part I highlighted in RED.
    Already been there (the picture is before I disconnected all cables)
    I started with disconnecting the cable coming from J806 (13.4V on the power supply) I disconnected it where the red square is in the picture. Testing it, gave me 13.66V which makes me believe that all is good on P800.
    So I disconnected the rest of the cables inside the red square, they all feed the Tuner boards. I then connected each individually to the cable coming from J806 and tested each again. In each of them, the voltage dropped to 5v-6v. this is what stumped me. I'll proceed with the current testing as Bob suggested and update after.

    Golan
     

    Attached Files:

    Last edited: Apr 11, 2018
  10. wlhd1610

    wlhd1610 Penny and her new friend Sponsor Subscriber

    Messages:
    2,422
    Location:
    Catskill NY
    OK,
    If you have done all that and with every wire disconnected from that terminal strip junction point AND then connecting each one individually ONE at a time to the feed wire from J806 you only get 5 vdc on J806 no matter which wire is connected then I would check the 13.6 volt power supply circuit with the wiring reconnected.
    Check for 14vdc on the base of H804,32vdc on it's collector and 13.4vdc on it's emitter .
    R809 (10 ohm) is usually used as Marantz circuit designer's "failsafe" protection on a lot of the boards.

    Bob
     
    rBuckner likes this.
  11. Golanr

    Golanr AK Subscriber Subscriber

    Messages:
    96
    Location:
    Chesterfield, MO
    Success!!
    Yesterday, just before I left it alone, I decided to test H810 (Zener Diode) which I didn't replace.
    It tested perfectly outside the board, so I put it back in and just left it as is, didn't even continue testing.
    Today, I set everything up for Bob's suggestions. When I turned the receiver on, I saw the signal meter moving, I quickly connected the PE01 board, plugged my headphones and.....it's working :banana:. If anyone can offer an explanation, I'll be happy to listen, but at this point, who cares :music:

    Prep for test.JPG Test.JPG Success.JPG After.JPG

    Next, is new velum paper and LED's. I'll keep updating.
     
    Last edited: Apr 11, 2018
    Mike Sweeney and wlhd1610 like this.

     

    Please register to disable this ad.

  12. rBuckner

    rBuckner Luv 2 Restore Subscriber

    Messages:
    9,613
    Location:
    Prescott, Arizona
    I agree with Bob's suspicions that something was/is amiss on the power supply board with that zener being the #1 suspect. That or there's a cracked or crystallized solder joint that is temporarily connecting due to things being flexed and wiggled around. If it fails again at least you have knowledge of where to look!
     
    Golanr likes this.
  13. Golanr

    Golanr AK Subscriber Subscriber

    Messages:
    96
    Location:
    Chesterfield, MO
    Today was a good day. Managed to blow the 5A fuse after replacing the Filter Caps. Was ready to check the rectifier, but looked at the diagram first. I noticed that I used the word NEGATIVE on the old caps as my Negative mark, rather than reading that the black dot marks Negative :no:. All is good now.
    Also replaced the lights with LEDs. What a pain to do the selector lights...

    Going to grab lunch and then closing. I'll post final pictures when I'm done.

    2275_PS_Caps.jpg LED.JPG Filter Front.JPG Filter Back.JPG
     
    Last edited: Apr 16, 2018
  14. Golanr

    Golanr AK Subscriber Subscriber

    Messages:
    96
    Location:
    Chesterfield, MO
    Finally completed this project! Thank you Bob and everyone who assisted me :beerchug:

    2275 Front Final.JPG
    2275 Top.JPG 2275 Top Front.JPG 2275 KEF 104aB.JPG
     
  15. Jailtime

    Jailtime Standin' on a corner Subscriber

    Messages:
    11,378
    Location:
    Velva ND
    Looks nice! :thumbsup: I like success stories.
     
    Golanr likes this.
  16. rBuckner

    rBuckner Luv 2 Restore Subscriber

    Messages:
    9,613
    Location:
    Prescott, Arizona
    Yes indeed, looks good!!
     
    Golanr likes this.

     

    Please register to disable this ad.

  17. Dingman

    Dingman Do you know where your towel is? Subscriber

    Messages:
    2,380
    Location:
    Des Moines, Ia
    A job well done.
     
    Golanr likes this.

Share This Page