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RF1 FRONT PANEL EXPANSION PCB Rev A
RevChange Document
Suggested
SCH PCB CAM
DATE
Performed by:
by:
3/7/2006
3/7/2006
x
x
JK
6/27/2006
x
x
JK
6/27/2006
x
x
JK
6/27/2006
x
x
JK
6/27/2006
x
JK
6/27/2006
x
JK
6/27/2006
x
JK
3/1/2006
x
JK
5/2/2006
x
JK
5/6/2006
x
JK
6/27/2006
x
JK
6/27/2006
x
JK
7/12/2006
Last Revised:
7/12/2006
DATE
Description of change:
TOP LEVEL CHANGES
JK
7/12/2006
Change all text from Rev 2 to A
JK
7/12/2006
Update all Part Types
Review/Integrate all outstanding ECNs
Note: ***A new solderpaste stencil IS required***
Change +48V bypass caps from 1 47uF,50V cap to 2 47uF,50V
JK
6/28/2006
caps in series to increase WV.
JK
6/28/2006
Change LEDS from Kingbright to Strongbase.
JK
6/28/2006
Remove end terminations.
JK
6/28/2006
Change column transistors from 2SC5592 to 2SD2114K.
SCHEMATIC CHANGES
Change LED holder part type to ECO-registered part so that it
JK
7/12/2006
shows up in the BOM and update part number.
For any header that will actual be installed with a staked cable,
change the part number attribute to the staked cable's part
JK
6/28/2006
number.
See if mounting pin holes for gain pots can be increased to
JK
7/12/2006
63mil.
Add ref des for bottom mounted headers on the top layer
JK
7/12/2006
silkscreen.
Add note on silkscreen to saying that the bottom mounted
JK
7/12/2006
headers need to be mounted on the bottom.
Reduce pad sizes of 2mm headers or change to round from
JK
7/12/2006
oval shape.
Remove soldermask clearance used for pot/encoder mounting
JK
7/12/2006
pin grounding experiments.
JK
7/12/2006
Change soldermask color to green on drill drawing notes.
Standard procedure
Standard procedure
Standard procedure
SMD components were added.
50V WV is too close to 48V phantom voltage.
Better availability overseas.
not required
Better availability overseas. Although 2SD2114K has
inferior VceSAT, difference is barely noticeable.
Facilitate BOM creation.
Facilitate BOM creation.
PCB CHANGES
Consolidate drill holes.
The adjacent rows are very prone to shorting.
no longer needed
Green for production PCBs.
Reason for change:
Not done -- current fit is just about right.
Increasing the hole size may make the pots fit
too loosely.
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