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Line 49:
Line 49: + + + + + + + + + − Zener diode D2 is reversed in the layout. It is correct in the schematics.+ + + + + +
Digital control board debugging notes (view source)
Revision as of 12:11, 19 October 2009
, 12:11, 19 October 2009no edit summary
== Wrong polarity of Zener Diode on -5V ==
== Wrong polarity of Zener Diode on -5V ==
=== Description ===
Zener diode D2 is reversed in the layout. It is correct in the schematics.
=== Solution ===
The diode was rotated on all the prototyping boards. This indications has '''not yet been entered into the layout'''.
=== Other Details and Current Status ===
This problem may be related to the overload on the -5V circuitry for of the DAC.
== Mismatched JTAG programming header ===
=== Description ===
The connector of the "Xilinx Platform USB II" kit seems to be a reduced size compared to the standard 0.1" spaced pin header with which the board is equipped.
=== Solution ===
For the testing stage, the flying lead connector is sufficient to bypass this problem. The layout must be corrected to the matching header (type?). Change entered already?