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Need help with pinout of Logitech Z506 DB9 connector

Discussion in 'Troubleshooting and Repair' started by Lennie, Oct 18, 2019.

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  1. Lennie

    Lennie

    3
    0
    Oct 18, 2019
    I bought a Logitech Z506 5.1 speaker system at a garage sale for $5. It was missing the Front Right (Control) Speaker and 1 Rear speaker but I want to try to hook it up to an HDTV as a 3.1 speaker system. The problem is I need to "bypass" the Control. What is the pinout of the DB9 connector on the subwoofer? I'm hoping I can switch the power by shorting 2 of the pins and control the volume with a potentiometer on the Left & Right channels.
     
  2. 73's de Edd

    73's de Edd

    2,773
    1,159
    Aug 21, 2015
    Sir Lennie . . . . .

    You say . . . . .
    I bought a Logitech Z506 5.1 speaker system at a garage sale for $5.


    SUCH a deal . . . already !

    Gleaning from your already astute observations . . . . .

    I would expect the DB connector to be routing 2 heavier wires as the speaker connections for that now wildly errant speaker.
    Check out all of the other wires used on that DB connector and see if you can associate their terminations with the YELLOW
    box markings that I have added on the schematic.
    Volume is controlled within that IC electronically in internal gain / transconductance stages via that pot.

    As far as the missing speaker connections I think that it will involve only one amp section of the left located STA540 Pwr amp.
    I'm looking at the HEAVY poly caps associated with the crcuitry going into the right STA540 . . . . suggesting that whole / total unit
    might be joined up in tanem . . . . JUST for driving the center woofer.

    That leaves the left speaker being fed by one section of the many amps in the left STA540 . . . . . now CHE E E E E E ECK IT OUT .

    MARKED UP TECHNO REFERENCING . . . .

    Logitech-Speaker.JPG
     
    Last edited by a moderator: Oct 19, 2019
  3. 73's de Edd

    73's de Edd

    2,773
    1,159
    Aug 21, 2015
    ERRATA . . . . caught after > 1 hr edit limitation. . . . . . on a reread.

    Check out all of the other wires used on that DB connector and see if you can associate their terminations with the YELLOW
    box markings that I have added on the schematic.


    On that illustration, the bottom line of the YELLOW box, needs to be lifted up so that it passes between pins 14 and 15 of the I.C.

    Text . . .

    I'm looking at the HEAVY poly caps being associated with the circuitry going into the right STA540 . . . . suggesting that whole / total unit
    might be joined up in tandem . . . . JUST for driving the center bass woofer.


    Observation . . . .

    Looks like a DB9 connector being used . . . . . on this product info photo and specs.

    https://secure.logitech.com/en-us/product/surround-sound-speaker-z506

    .
     
    Last edited: Oct 19, 2019
  4. Lennie

    Lennie

    3
    0
    Oct 18, 2019
    Thanks for the info I will try to reverse engineer the pinout of the DB9 connector on the Z506 subwoofer. If anyone actually owns the Right Front (control) speaker and could ohms check it for which pins are the power switch and which are the volume control knob & which are the Front Right speaker output that would be greatly appreciated.
     
  5. Imhim

    Imhim

    2
    0
    Jan 28, 2020
    Did you ever figure out a way to use the subwoofer with the control speaker?
     
  6. Imhim

    Imhim

    2
    0
    Jan 28, 2020
    Without the control speaker. I trying to do the same thing.
     
  7. jeff15113

    jeff15113

    1
    0
    Jan 28, 2020
    I found something that might be of help. Its the pinout of x230 FR speaker connecter. Its looks identical to the z506. Maybe the pinout is the same? I also have the sub without the control speaker. Looking forward to figuring this out.
     

    Attached Files:

  8. Lennie

    Lennie

    3
    0
    Oct 18, 2019
    No the connector is the same but the pinout is different. The Z506 has a single line volume control (e.g. just a pot for feedback). I haven't figured it out yet. If anyone has the control speaker and can trace the signals that would be a big help!
     
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