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Bug #3251

closed

osmo-e1-xcvr: R1 doesn't connect to GND?

Added by laforge almost 6 years ago. Updated almost 6 years ago.

Status:
Resolved
Priority:
Normal
Assignee:
Category:
-
Target version:
-
Start date:
05/09/2018
Due date:
% Done:

100%

Spec Reference:

Description

it seems at least on Dieters' board the GND end of the 3kOhms R1 was somehow not connected to GND. If that connection is manually created, the board consumes >= 50mA more current and the red "LOS" LED shows up at start.


Related issues

Related to E1/T1 Hardware Interface (including icE1usb) - Bug #3248: osmo-e1-xcvr fails to talk SPIClosed05/08/2018

Actions
Actions #1

Updated by laforge almost 6 years ago

  • Related to Bug #3248: osmo-e1-xcvr fails to talk SPI added
Actions #2

Updated by roh almost 6 years ago

i did some measurements and the pcbs seem to be buggy.
there are grounds missing inbetween multiple parts, but R1 not being connected to ground is the only known 'missing trace' so far.

fix:
add a piece of copper enamel wire from C4 connector side to R1 connector side to connect R1 to gnd.
one can use the same the same wire to run gnd to pin44 of U1 as well.

Actions #3

Updated by laforge almost 6 years ago

  • Status changed from New to Resolved
  • % Done changed from 0 to 100

some pcb production issue. Design files are correct, so future batches will unlikely be affected.

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