PACS Status Report - WE

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PACS Status Report - WE SVR-2 MPE, 18 Jan
2007 O.H. Bauer
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FM ILT WE Configuration

• DPU FM
• SPU FM (partly repaired)
• DECMEC EQM (not redundant and only blue array)
• BOLC FM
• Second set-up used for SPU OBS development

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Instrument Overview and Subsystem Responsibilities
Cryo-Harness
13
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WE Status I

• DPU
• Problems in CFM identified (ringing of bus lines)
  and S/W work-around implemented
• FM apparently does not show the same symptoms,
  but showed some erratic behaviour (MEMCOPY
  routine caused corrupted data packets)
• SPU, DECMEC (but also LFI REBA, ...)
• During tests at CRISA read errors from the DSP
  program memory (PRAM), only with special memory
  contents, were found.
• Error was found on all DSP PCBs ? systematic
  design error!
• PACS FM SPU partially repaired, can be used for
  FM ILT.
• ? Complete repair and re-qualification after ILT
  will take four weeks.
• BOLC OK

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WE Status II

• DECMEC
• During TV test (cold phase, -25C) DECMEC FM
  stopped after one hour of operation two dead
  transistors found, temperature/design problem
• ?Delivery of qualified FM (not EMC can be done
  after FPU delivery) later than mid Feb has
  dramatic impact on ILT schedule and delivery
• ?Most of ILT has to be executed with EQM, which
  is not fully FM-equivalent (lacking redundancy,
  only blue DEC)
• ?Change to red array and swap of EQM against FM
  need warm-up to 40 K

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Schedule

• Schedule Summary FM (refurbished CQM for FPU)
• ILT at MPE cool down started 19 Oct
  06
• Partial warm-up/cool-down forchange to red GeGa
  array 16/19 Dec 06
• Warm-up/cool-down for exchange
• of chopper, repair of illumination
• problem and possible DECMEC
• exchange 23 Dec 06 18 Feb 07
• ? DECMEC FM delivery to MPE mid Feb 07
  ??
• FM WE/FPU delivery to Project late
  April 07 !?
• Schedule for FS FPU
• FS FPU ready for possible
• delivery to Project
  end Sep 07