Loading ...
Sorry, an error occurred while loading the content.

12580Re: [tracker2] OT2m defect - poor RX sensitivity problem

Expand Messages
  • Teddy Banks
    Jun 1, 2011
    • 0 Attachment
      C1 and C2 are mounted differently than r1 d5, ie C1 and C2 are mounted
      left to right from the screw, D5 an R1 are mounted vertically. KC0WNY

      On 6/1/2011 10:07 AM, Scott Miller wrote:
      > You can check if it's affected easily enough - just take the cover off
      > and check C1 and C2, near the upper left screw on the PCB when the LEDs
      > are facing you. They should be oriented front to back like the other
      > components in that row, not side to side.
      >
      > Scott
      >
      > On 6/1/2011 6:57 AM, Teddy Banks wrote:
      >> I just received one, but I am just an appliance operator.
      >>
      >> On 5/31/2011 4:11 PM, Scott Miller wrote:
      >>
      >>> I just discovered that our contract manufacturer made an error in
      >>> assembling the latest batch of OT2m boards. They installed capacitors
      >>> C1 and C2 incorrectly, and the result is that the boards require a high
      >>> (> ~1.5Vp-p) audio level to function correctly. We got the first
      >>> portion of the batch assembled and tested just hours prior to Dayton and
      >>> didn't catch the problem then because the audio level on the test setup
      >>> was too high - they were tested for noise handling but not for low audio
      >>> levels.
      >>>
      >>> If you bought an OT2m at Dayton or received one in the last week (only 2
      >>> or 3 units made it out after Dayton before we discovered the problem),
      >>> then it's probably affected by this problem.
      >>>
      >>> There are 3 options for dealing with the defect:
      >>>
      >>> 1. Short solder jumper SJ2. The frequency response will be affected a
      >>> bit, but in our testing it hasn't seemed to have any negative impact on
      >>> the decode performance. This is the easiest fix and requires only a
      >>> soldering iron.
      >>>
      >>> 2. Install the capacitors correctly. C1 should be on the left and C2 on
      >>> the right. They were installed with C1 on top (horizontal) and C2
      >>> below. This will require a hot air pencil or a steady hand with a
      >>> soldering iron.
      >>>
      >>> 3. Send it back to us. You can contact me off-list for an RMA, and if
      >>> you're in the US we can send a pre-paid mailing label.
      >>>
      >>> I'm going to try to track down as many Dayton purchases as I can, but we
      >>> only have records for credit card purchases. If you know anyone who got
      >>> an OT2m at Dayton this year, please let them know.
      >>>
      >>> The test fixture is now set to a very low audio level to check for this
      >>> problem, and I'm going to make sure the CM gets their programming fixed
      >>> right now. I don't know how they managed to get it wrong on this job
      >>> and right on the last one, but they just moved to a new facility so I'm
      >>> thinking they might have also switched to a different pick and place
      >>> machine and re-entered the program manually.
      >>>
      >>> Scott
      >>>
      >> --
      >> KC0WNY - Ted
      >>
      >>
      >>
      >
      >
      > ------------------------------------
      >
      > Yahoo! Groups Links
      >
      >
      >
      >

      --
      KC0WNY - Ted
    • Show all 4 messages in this topic