Results 1 to 11 of 11

Thread: MXR Flanger 117 map required

  1. #1
    Senior Member
    Join Date
    Sep 2012
    Location
    South coast UK
    Posts
    649
    Thumbs Up/Down
    Received: 16/0
    Given: 24/0
    Rep Power
    8

    MXR Flanger 117 map required

    Hello all
    A bit of a long shot. Got a MXR Flanger 117 with no effect but working bypass
    I have the original map but there don't seem to be a 117 version available ?
    if anyone can assist i would be truly grateful

    have a good day

    BBB

    0 Not allowed! Not allowed!

  2. #2
    Member
    Join Date
    Dec 2009
    Location
    Canada
    Posts
    265
    Thumbs Up/Down
    Received: 143/0
    Given: 4/0
    Rep Power
    10
    Here is the M-117 schematic. Which version schematic do you have?

    https://music-electronics-forum.com/...1&d=1571150504
    Attached Files Attached Files

    0 Not allowed! Not allowed!

  3. #3
    Senior Member
    Join Date
    Sep 2012
    Location
    South coast UK
    Posts
    649
    Thumbs Up/Down
    Received: 16/0
    Given: 24/0
    Rep Power
    8
    thanks Dmeek . im not sure. not the version above
    it says MXR 117 version 2 on it
    Click image for larger version. 

Name:	SAM_6192.JPG 
Views:	28 
Size:	1.49 MB 
ID:	55570

    bbb

    0 Not allowed! Not allowed!

  4. #4
    Member
    Join Date
    Dec 2009
    Location
    Canada
    Posts
    265
    Thumbs Up/Down
    Received: 143/0
    Given: 4/0
    Rep Power
    10
    That's the newer series. I don't have a schematic for that one. The MN3204 chip is the bbd delay, pin 3 is input. other than that these SMD boards are very hard to trace without a schematic.
    Check that you have +5V or more on MN3204 pin 5

    0 Not allowed! Not allowed!

  5. #5
    Senior Member vintagekiki's Avatar
    Join Date
    Jul 2006
    Posts
    1,635
    Thumbs Up/Down
    Received: 291/1
    Given: 241/0
    Rep Power
    16

    0 Not allowed! Not allowed!
    Who does not know and knows that he does not know - teach him Confucius)
    Who knows and does not know that he knows - wake him Confucius)

  6. #6
    Senior Member
    Join Date
    Sep 2012
    Location
    South coast UK
    Posts
    649
    Thumbs Up/Down
    Received: 16/0
    Given: 24/0
    Rep Power
    8
    thank you... I have searched the internet and checked out all these before i post a request .Hoping that someone might have one, but again none of these are about the model i have
    BBB

    0 Not allowed! Not allowed!

  7. #7
    Senior Member
    Join Date
    Sep 2012
    Location
    South coast UK
    Posts
    649
    Thumbs Up/Down
    Received: 16/0
    Given: 24/0
    Rep Power
    8
    thanks i will check that out
    bbb

    0 Not allowed! Not allowed!

  8. #8
    Senior Member
    Join Date
    May 2006
    Posts
    3,848
    Thumbs Up/Down
    Received: 203/2
    Given: 20/0
    Rep Power
    18
    When you say "no effect", do you mean no signal at all, or do you simply mean no flanging effect? Both are possible, but have different causes.

    Though not always the case, disappearing flanger or chorus effects can often occur because of a miscalibrated trimmer. All bucket-brigade devices, regardless of what they are used for, require a DC bias voltage at their input. If the voltage is set too high or too low, no audio signal will pass. Adjusted a little high or a little low, signal will pass, but will be distorted and less than maximum volume. In the case of the MN3204, that trimmer will be tied to pin 3, usually through a fixed resistor. It is possible to play with the bias setting, without risking damage to the delay chip.

    The trimmer closest to the MN3204 might be the bias trimmer, but I'm not absolutely sure. There is often a second trimmer connected to the output of a BBD (in this case, pins 7 and 8), which adjusts the relative balance/level of the two parallel outputs of the chip, so as to minimize clock noise. And that trimmer close to the chip might be it. One way to verify is to check for continuity between pins 7 and 8 and the two outside lugs of that trimmer.

    The reissue board you show has some changes which make it diverge from the original schematic a bit. Not necessarily tonally, but in terms of the specific circuitry required. So I don't know , or rather can't be certain, about which trimmer corresponds to which in the original schematic.

    0 Not allowed! Not allowed!

  9. #9
    Senior Member
    Join Date
    Sep 2012
    Location
    South coast UK
    Posts
    649
    Thumbs Up/Down
    Received: 16/0
    Given: 24/0
    Rep Power
    8
    There was bypass and when you switched over to effect. led came on but no signal at all.
    tried to trace the signal but i have to admit. No schematic its hard for me.

    BBB

    0 Not allowed! Not allowed!

  10. #10
    Senior Member
    Join Date
    May 2006
    Posts
    3,848
    Thumbs Up/Down
    Received: 203/2
    Given: 20/0
    Rep Power
    18
    Do you have some means to bypass the bypass circuit? IN other words, to feed the input jack to the circuit input and circuit output to output jack.

    0 Not allowed! Not allowed!

  11. #11
    Senior Member
    Join Date
    Sep 2012
    Location
    South coast UK
    Posts
    649
    Thumbs Up/Down
    Received: 16/0
    Given: 24/0
    Rep Power
    8
    not sure mark. to be honest im going to leave this one. I just don't get enough time to do the jobs as it is
    thanks for the help, without the map i won't waste my time
    many thanks
    BBB

    0 Not allowed! Not allowed!

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Mu-tron Flanger
    By lowell in forum Guitar Effects
    Replies: 4
    Last Post: 02-08-2018, 06:59 PM
  2. Wasburn fx4 flanger
    By QJerry in forum Schematic Requests
    Replies: 0
    Last Post: 11-10-2011, 07:23 AM
  3. a/da flanger question
    By rockinrendell in forum Guitar Effects
    Replies: 7
    Last Post: 05-13-2009, 02:28 PM
  4. MXR Flanger 117 Issues
    By simplefun in forum Guitar Effects
    Replies: 0
    Last Post: 11-12-2008, 12:23 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •