Transcript (ppt)
Results of 1st Run P.A. Test Fixture
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RESULTS OF 1st RUN PITCH
ADAPTER TEST FIXTURE
Peter Amnuaypayoat
October 15, 2004
[email protected] x8985
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Results of 1st Run P.A. Test Fixture
Equipment Set-Up of Pitch Adapter Testing
STORAGE CASE
ZEBRA CONNECTOR
SOFTWARE/
ELECTRICAL FIXTURE
MCM WITH
PITCH ADAPTER
TEST FIXTURE
CONNECTOR SAVER
GROUND LEAD
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Results of 1st Run P.A. Test Fixture
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Initial Issue of Test Fixture
Zebra connector
Mount
Zebra Connector
Zebra Connector did not have proper conductivity
with Zebra Connector Mount
–Tested Zebra Connector with Ohm meter
• Zebra Connector : 100 Ohms
–Tested Zebra Connector Mount w/ Ohm meter
• Zebra Connector Mount: 1 Ohm
• Zebra Connector Mount has Alodine
surface on all three contact faces of
Zebra Connector
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Initial run did not have any connection between
Zebra Connector and Zebra Connector Mount.
–From testing with an Ohm meter, we found
that a connection could be made with a large
amount of force being applied to the Zebra
Connector.
–This force was too much for the Test Fixture
to be capable of, and presumably too much for
the Pitch Adapter to handle.
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Quick Solution for Issue to Continue Testing
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Switched to alternate Zebra Mount with deeper
Zebra Connector slot
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Applied a thin non-coated conductive wire
between the Zebra Connector and Zebra
Connector Mount
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Connected the “sandwiched” wire, directly to
the grounding lead
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Applied enough force to the Zebra Connector to
have contact with conductive wire
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Test Results of 1st Run Pitch Adapter Test Fixture
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Tested 5 different MCM’s, including 2 with no bad traces (according to Visual Inspection).
– 2 tall MCM’s
– 3 short MCM’s
Test Software was able to count amount of disconnected channels/traces and give there location.
– Delta’s (additional disconnected channels) of Trial runs were NOT visually inspected for each MCM
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Additional disconnected traces/channels were assumed to be nonconductive points between the Zebra Connector and the
Conductive wire
Additional disconnected traces/channels could also be disconnected/malfunctioning chips?
– Delta of disconnected channels were not always in the same location.
Conclusion of 5 test runs:
– Connection between Zebra Connector and Conductive wire was not consistent
– Wire was may have been too stiff and therefore contained “kinks” that allowed nonconductive points between the Zebra
Connector and Conductive wire
– Presumed: if connection between Zebra connector and ground lead were constant (complete connection throughout the entire
strip), ALL Delta’s of trial runs would equal 0
FIRST RUN PITCH ADAPTER TEST RESULTS
MCM
# OF BAD CHANNELS DETECTED FROM # OF BAD CHANNELS DETECTED FROM
VISUAL INSPECTION
P.A. TEST FIXTURE
DELTA OF VISUAL INSPECTION
AND TEST FIXTURE
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25
25
0
2
9
13
4
3
0
4
4
4
0
0
0
5
1
1
0
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Solutions for Zebra Connector to Zebra Connector Mount
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Use a more conductive and pliable wire to be placed between the Zebra connector and the
Zebra connector Mount
2.
Use a Conductive Bond/Epoxy to bond the Zebra Connector into the slot of the Zebra
Connector Mount
– Heat required for Conductive Bond/Epoxy?
– Zebra Connector may not be compatible with Conductive Bond/Epoxy
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Apply “conductive foil” between the Zebra Connector and slot of the Zebra Connector
Mount. Connect foil directly to ground lead.
– Material?
– Availability?
– Thickness?
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Modify Zebra Connector Mount to physically clamp down on Zebra Connector, therefore
“Squeezing” the Zebra Connector and applying enough force to create a uniform
connection
– Machining required
– New parts will need to be created
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Objectives Covered by 1st Run Test
Pitch Adapter Test Fixture
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Proper connection of Zebra Connector to Pitch Adapter
Fine adjustment of contact of Zebra connector to Pitch
Adapter
Fine adjustment of Pressure of Zebra connector to Pitch
Adapter
Ability to accept and test MCM while in new Burn-IN
storage Case
Works with Electrical test fixture and Software
User Friendly and tool free
Software
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Determines # amount of disconnected channels on Pitch
Adapter
Determines location ( which ladder) of disconnected
channels
New Burn-IN Storage Case
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ESD safe
Accepts current Connector Saver
Protection of MCM/no allowance of unwanted flexing
Ease of handling and storage (lid removal and integration
into the P.A. Test fixture)
Reusable
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Outcome of 1st Run of Test Fixture
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Pitch Adapter Test Fixture mechanically performs as expected
New Burn-IN Case and lid mechanically perform and function as expected
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Need to implement a better interface between the Zebra Connector and the Zebra Connector
Mount
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Need to test New Burn-IN Case and lid for:
– thermal cycling
– Burn-IN
AFTER THE FIRST TEST RUN OF THE P.A. TEST FIXTURE, I FEEL QUITE CONFIDENT THAT A
BETTER INTERFACE FOR THE ZEBRA CONNECTOR WILL BE ATTAINED EASILY. AFTER
THE IMPLEMENTATION OF A NEW INTERFACE, WE WILL TEST FOR ZERO
DISCREPENCIES BETWEEN THE VISUALLY INSPECTED MCM’S AND THE TEST FIXTURE
INSPECTED MCM’S.
IF “ADDITIONAL DISCONNECTED TRACES/CHANNELS” ARE
MALFUNCTIONING/DISCONNECTED CHIPS, THEN CURRENT SET UP IS FUNCTIONAL
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