Dm800se USB ports information

Discussion in 'Schematic drawings, Pcb images etc..' started by Johnny B., Jun 13, 2015.

  1. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

    Messages:
    2,533
    Likes Received:
    1,302
    Trophy Points:
    113
    Gender:
    Male
    Location:
    Netherlands
    Home Page:
    Follow the colors, and you know where the PCB trace goes.
    Also the U1000/U1001 pdf datasheet added.

    Good luck.

    dm800se-usb-intern-extern.jpg
     

    Attached Files:

  2. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

    Messages:
    2,533
    Likes Received:
    1,302
    Trophy Points:
    113
    Gender:
    Male
    Location:
    Netherlands
    Home Page:
    And for the DM800SE service port, see this schematic.

    dm800se-usb-serviceport.jpg
     
  3. Jane

    Jane Member

    Messages:
    118
    Likes Received:
    12
    Trophy Points:
    18
    Thank you for the service port information. Do you think if I use TX,RX and GND signals (with an appropriate voltage bridge) I will get a correct output, in case the CP2102 is faulty? I have two DM800SE that have strange output in Putty. I changed Y800 but it did not help.Thanks
     
  4. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

    Messages:
    2,533
    Likes Received:
    1,302
    Trophy Points:
    113
    Gender:
    Male
    Location:
    Netherlands
    Home Page:
    I've tried that with a rs232 module from a vu duo box to make it serial instead of usb but it not works.
    I think because it can't work when the usb chip is still connected to the rx/tx circuit.
    Without the usb chip I have still not tried.

    In any case it is not a normal rx / tx connection, it needs a chip.
     
  5. Jane

    Jane Member

    Messages:
    118
    Likes Received:
    12
    Trophy Points:
    18
    Thanks for the reply. I think Rx/TX is a kind of UART connection. And U90 is a simple USB TO UART BRIDGE.
    I simply use Arduino Uno ( without the Atmel chip) as a USB bridge. I connect Arduino to my laptop via Usb, and RX,TX, GND connect to RX,TX,GND on a mainboard where I need UART output to be shown in putty.
    And it generally works. But my problem is strange character with this mainboard.
    You mentioned VU receiver, did you have a time or will you have soon :) to check if you are able to change a register's value of the CPU of VU and if it remains after rebooting? When I tried with BCM7405, the changed value returned to the default after restart.
    Thanks
     
  6. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

    Messages:
    2,533
    Likes Received:
    1,302
    Trophy Points:
    113
    Gender:
    Male
    Location:
    Netherlands
    Home Page:
    Yeah okay, but what if the USB chip has a problem on the Rx / Tx CPU side, then a second chip on the circuit will show the same.
    At least, it seems to me logic.
    Maybe you can find some issue if you measure the rx/tx with ohm, and compare the values with a good one.

    And no, I have very little free time to pick out special cases.
    But I have discovered at the wrong 800se cpu, if I enable the debug, and Flash sector recovery in the bios, it seems to start further.
    Unfortunately I had not the time to examine it further because of the many repairs I have.
     
  7. Jane

    Jane Member

    Messages:
    118
    Likes Received:
    12
    Trophy Points:
    18
    Yes, as I can see I must still learn from expert like you. But just to check th eproblem again I removed U90 and tried again with UART but the same. But I checked voltage ( and frequency ) on Y800 and it was only about 0.6V, while another DM800SE had about 1.3V on Y800. So I wanted to know where the voltage is coming from. I would say it is from CPU ( Correct?or wrong?)I found out the voltage from CPU is coming to R806 and R803, so I desoldered them and measured voltage.Again on the faulty DM800 was about 0.3V. Do you think CPU is faulty?


    Regarding faulty CPU you say:
    But I have discovered at the wrong 800se cpu, if I enable the debug, and Flash sector recovery in the bios, it seems to start further.
    I tried to set various options with BIOS( pressing S character to start BIOS) but after restart there was again the default value. Is it normal?
    Thanks
     
    Last edited: Sep 16, 2015
  8. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

    Messages:
    2,533
    Likes Received:
    1,302
    Trophy Points:
    113
    Gender:
    Male
    Location:
    Netherlands
    Home Page:
    See this drawing for the tracks to the Y800.

    But, I advice to measure the ohm value between these two tracks, best is to do this without the crystal.
    Normally this doesn't matter because the crystal gives no ohm value, but by a defect it can.
    Also, best is to measure it between the R803 and the R806 cpu side, this to exclude the other parts.

    In any case, if you have a good measurement between these two tracks, you may assume that the tracks to the cpu dots are fine.
    That is, if the C801 is not shorted.
    If not, bad solder contact with one of the dots, or defect cpu.

    DM800SE-Y800-information.jpg
     
  9. Jane

    Jane Member

    Messages:
    118
    Likes Received:
    12
    Trophy Points:
    18
    Thanks for the reply. SO I measured :
    Good DM800SE: Between crystal 1.7k Ohm, between R806 and R803 1.6k Ohm
    Faulty DM800SE: Between crystal 1.9k Ohm, between R806 and R803 1.7k Ohm

    Do you think are values OK?
     
  10. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

    Messages:
    2,533
    Likes Received:
    1,302
    Trophy Points:
    113
    Gender:
    Male
    Location:
    Netherlands
    Home Page:
    The ohm difference is not something to worry about.
    For example,
    Good DM800SE Ferrari RevD4: Between crystal 16.71k Ohm, between R806 and R803 16.51k Ohm.
    Good DM800SE Estar Rev9: Between crystal 14.94k Ohm, between R806 and R803 14.79k Ohm.

    Although you measure there a wrong vdc value, it seems not to be caused by this circuit.
    I think it only gives a indication that there is something wrong.

    I'm guessing a cpu issue, but it's not to say for sure.
     
  11. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

    Messages:
    2,533
    Likes Received:
    1,302
    Trophy Points:
    113
    Gender:
    Male
    Location:
    Netherlands
    Home Page:
    Sorry I have overlooked it,
    No if you have saved the settings, it must stay.
    Only the Flash sector recovery setting disables after a reboot.
    Therefore you must enable this, as choose use this settings once.

    And, all these settings are stored into the U8 two-wire serial eeprom.
    More info about this ic see the datasheet.
    U8-FT24C04A Datasheet.pdf
     

    Attached Files:

  12. Jane

    Jane Member

    Messages:
    118
    Likes Received:
    12
    Trophy Points:
    18
    Thanks for the info.
    I work like this:
    Start Putty program
    start DM800SE
    wait for "S" to enter BIOS
    Change values in BIOS I need
    I use one of the SAVE option (From the last menu in BIOS, )
    ENTER

    Do you use the same procedure to save the changed values of BIOS?
     
  13. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

    Messages:
    2,533
    Likes Received:
    1,302
    Trophy Points:
    113
    Gender:
    Male
    Location:
    Netherlands
    Home Page:
    Yes it doesn't matter which you choose, the debug setup must stay when you saved it.
     
  14. wolfris

    wolfris New Member

    Messages:
    2
    Likes Received:
    0
    Trophy Points:
    1
    Gender:
    Male
    Hello, Tell me, please, the value of resistors R808 and R809 ??? Ohms.
    Hi, Help my. Tell me, please, the value of resistors R808 and R809 ??? Ohms. DM 800 SE
    Thanks
     
  15. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

    Messages:
    2,533
    Likes Received:
    1,302
    Trophy Points:
    113
    Gender:
    Male
    Location:
    Netherlands
    Home Page:
    Ohm value measured between the ground and the resistor

    Both are bridges, so both are 0 ohm resistors.
    R808 both sides 0.486k
    R809 is a ground bridge.
     
  16. wolfris

    wolfris New Member

    Messages:
    2
    Likes Received:
    0
    Trophy Points:
    1
    Gender:
    Male
    Ok Thanks
     
  17. SaintRafik

    SaintRafik New Member

    Messages:
    3
    Likes Received:
    0
    Trophy Points:
    1
    Gender:
    Male
    Are the capacitor C909 has a value of 1μF?
     

    Attached Files:

  18. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

    Messages:
    2,533
    Likes Received:
    1,302
    Trophy Points:
    113
    Gender:
    Male
    Location:
    Netherlands
    Home Page:
    Hi, Yes the C909 is a 1μF ceramic cap.