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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

    5
    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

    3,040
    1,286
    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

    3,040
    1,286
    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

    5
    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

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

    Imhim

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

    jeff15113

    1
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    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

    5
    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!
     
  9. Gonzoid

    Gonzoid

    1
    1
    Apr 1, 2020
    Not sure if you still needed this information.

    Pin 1: Brown, Headphone jack ring terminal
    Pin 2: Orange, On/Off button
    Pin 3: Green, Going through a 10k resistor towards the headphone jack circuit, not sure what for
    Pin 4: Purple, Headphone jack sleeve terminal and ground for potentiometer
    Pin 5: Blue, Potentiometer
    Pin 6: Red, Headphone jack tip terminal
    Pin 7: Yellow, On/Off button
    Pin 8: Grey, Speaker Negative (-)
    Pin 9: White, tied to black wire, Speaker Positive (+)

    Note that it's a dual pot on board. Tried to upload an image, but was unsuccessful. Hope this helps with your issue.

    Unfortunately my issue is that the left/right speakers are now super quiet and have to be turned up all the way to hear anything, so I will have to troubleshoot that issue.
     
    Dvilla likes this.
  10. Lennie

    Lennie

    5
    0
    Oct 18, 2019
    Thanks for the info - my project is on hold at the moment but this information will definitely help me decipher the Z506.
     
  11. Lennie

    Lennie

    5
    0
    Oct 18, 2019
    My project is currently on hold but this information will definitely help me decipher the Z506 speaker system. Thanks.
     
  12. Ahmad Bilal

    Ahmad Bilal

    1
    0
    Apr 3, 2020
    Please do post what you did as I happen to be in the same page got the speaker with the unit except for the front right anyway to by pass it would be a great help. Anyways with my limited knowledge of electronics I tried shorting the pins 2,7 and 4,5 to get the speakers to work but in vain. Now I don't know if they are out of order or is there something else to do any advice would be appreciated.
    Regards.
     
  13. avramar64

    avramar64

    1
    3
    May 23, 2020
    Hello everyone!

    1 - audio signal to headphones connector (R)
    2 - Vcc after power switch ON
    3 - connected through 10k resistor to pin 2 of DB9 for normal operation. Disconnected for headphones use.
    4 - GND
    5 - Potentiometer cursor
    6 - audio signal to headphones connector (L)
    7 - 20 Vcc from power supply
    8 - FR speaker +
    9 - FR speaker -

    The potentiometer resistor is connected to GND through a 1.2K resistor and to Vcc through 560 ohms resistor. The cursor goes to pin 5 of DB9.

    Potentiometer value is 50K

    An approximate schematic is attached.
     

    Attached Files:

    Falken, Ahmad Bilal and Martaine2005 like this.
  14. Falken

    Falken

    2
    0
    Dec 26, 2020
    Hello!!

    Some picture bro? Finished conections? Step by step please.

    I neee help too.

    Thanks.
     
  15. Falken

    Falken

    2
    0
    Dec 26, 2020
     
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