1 / 9

First Pass Yield

First Pass Yield. YIELD STATUS. NCM Procedure Applied . PY3 experienced a 70% FPY PY4 cannot tolerate a 70% FPY GOAL: Raise FPY to 90% in PY4. Combined FAT & SP Failure Categories. Action Plan #1. NCM Procedure Applied . Flasher Board STF Failures (18% of Fails):

marlin
Download Presentation

First Pass Yield

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. First Pass Yield

  2. YIELD STATUS NCM Procedure Applied • PY3 experienced a 70% FPY • PY4 cannot tolerate a 70% FPY • GOAL: Raise FPY to 90% in PY4

  3. Combined FAT & SP Failure Categories

  4. Action Plan #1 NCM Procedure Applied • Flasher Board STF Failures (18% of Fails): The largest NCM contributor • Root Cause(s): • Main Board Clock Driver behavior • Other potential causes under investigation • Corrective Action: • Revised HAL software/Flasher Bd. CPLD firmware • LBNL investigating MB Clock-possible new part. • “low risk” changes for this year • Prognosis for PY4: • Significant reduction in occurrence. • Watch in Mini-Fat.

  5. Action Plan #2 NCM Procedure Applied • Low PMT Gain Failures (14 % of Fails): Second largest NCM contributor • Root Cause(s): • Software Glitch in testing • Same Gains specs applied to both Ice Top & In-Ice PMTs. (10% PMTs right at Gain Margin) • Corrective Action: • Instituted Software changes for FAT3 • For PY4, Incoming Insp screen to sort lower end gains for Ice Top/ higher end gains for in-ice. • Prognosis for PY4: • Elimination of Low PMT Gain failures

  6. Action Plan #3 NCM Procedure Applied • Reboot Failures (14 % of Fails): Third largest NCM contributor • Root Cause(s): • Initial CPLD programming not robust • Other Root Cause(s) under investigation • Corrective Action: • Reprogrammed CPLDs/ Retested DOMs. Works for most. • 3 “4-29 Rev. CPLD” failures in FAT 3/ Re-run in FAT 4. • Further investigation continues. • Prognosis for PY4: • No new reboot failures in PSL FAT 4, DESY FATs 2, 3. Looks good for this year.

  7. Action Plan #4 NCM Procedure Applied • OTHER: 12% of Failures • Fourth largest NCM contributor • 7 = DC Corning Gel • 2 = Incorrect DB Entries • 2 = Monitor DAQ • 2 = REDO DOMCAL • 1 = Many STF Fails • 1 = Chipped Sphere • 1 = Broken Penetrator Connector • 1 = Pressure Leak • Prognosis for PY4: • No more DC Gel • Break out “Other Category”

  8. Going Forward • We appear to have solved the “Big” reasons for Fallout (80%) • However: Increased production • New, Faster Evaluation Methods • Keep Production Going and return vital analytical info to Project • Supplier Communication: Vital • Open up NCM process to ALL!

More Related