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                        FIELD INFORMATION NOTICE
                  (For Authorized Distribution by SunService)

FIN #: I0373-1

Create Date: Mar/05/98

Keywords: 

EMI Clip on the A5000 Vertical Interconnect Board can short the fibre Channel signal traces.

Top FIN/FCO Report: Yes

Products Reference: A5000 EMI CLIP

Product Category: Storage / A5000


PART NUMBERS AFFECTED:

N/A

Product Affected: 

SG-XARY010A-45G       45.5 GB Sun Enterprise Network Array
SG-XARY010A-127G     127.4 GB Sun Enterprise Network Array
SG-XARY010A-254G     254.8 GB Sun Enterprise Network Array
SG-XARY010A-509G     509.6 GB Sun Enterprise Network Array

Parts Affected: 

N/A

References: 

N/A

Issue Description: 

SMCC Engineering has noted several isolated instances involving the 
Enterprise Network Array, where the EMI clip sandwiched between the 
underside of the Horizontal Interconnect Board and the top edge of
the Vertical Interconnect Board nearest the Interface Boards, had
shifted just far enough to allow the EMI clip to overlap and make
contact with the soldermask over the Fibre Channel signal traces.
 
If one trace is grounded by the clip, the unit may experience a hard 
fault or random faults on Loop A. If both traces are grounded by the 
clip, Loop "A" will experience a hard fault.

*This problem can manifest as the following errors on the HOST system:


WARNING: /sbus@2,0/SUNW,socal@d,10000/sf@0,0/ssd@w210000203707d2a3,0 (ssdX):
        SCSI transport failed: reason 'timeout': retrying command

WARNING: /sbus@2,0/SUNW,socal@d,10000/sf@1,0/ssd@w210000203707d288,0 (ssdX):
        SCSI transport failed: reason 'timeout': retrying command

WARNING: /sbus@2,0/SUNW,socal@d,10000/sf@0,0/ssd@w210000203707d1d3,0 (ssdX):
        SCSI transport failed: reason 'timeout': retrying command

WARNING: /sbus@2,0/SUNW,socal@d,10000/sf@1,0/ssd@w210000203707d3e2,0 (ssdX):
        SCSI transport failed: reason 'timeout': retrying command

WARNING: /sbus@2,0/SUNW,socal@d,10000/sf@1,0/ssd@w210000203707d273,0 (ssdX):
        SCSI transport failed: reason 'timeout': retrying command

WARNING: /sbus@2,0/SUNW,socal@d,10000/sf@0,0/ssd@w210000203707d2a3,0 (ssdX):
        SCSI transport failed: reason 'timeout': retrying command

socal0: port 1: Fibre Channel is OFFLINE
WARNING: /sbus@2,0/SUNW,socal@d,10000/sf@1,0/ssd@w210000203707d3e2,0 (ssdX):
        SCSI transport failed: reason 'tran_err': retrying command


*NOTE: The above warning messages serve only as an example. Under actual
       site conditions the device naming convention will vary.


This problem will appear by FRU Isolation on the A5000, to be a "faulty"
Front Drive Backplane on Loop A, or a "faulty" Interface Board on Loop
A.  In either case, the FRUs are NOT likely to be faulty, the EMI clip
should be checked and if necessary, moved off of the signal traces.  The 
fault should not be harmful to the FRUs due to the current limiting 
circuitry in the signal path.

Corrective Action: 

*Reference the Sun Enterprise Network Array Installation and Service
 Manual (Part No. 802-7573-10) for complete diagnostic and FRU replace-
 ment procedures.
 

The following procedure can be used to confirm EMI clip related faults:

On the FPM (Front Panel Module) press the button on the lower right corner
the access the "Menu" and the Level 2 Status Screens. Select the icon on
the left center of the FPM to access the "Interface Boards" (IB) Menu and 
perform the following:


1. Through IB A, Port 0 (Right), verify that the FULL loop fails with
   the Front backplane in the loop, and passes with the Front Backplane
   bypassed. 
   

2. Through IB A, Port 1 (Left), verify that the FULL loop fails with the
   Front backplane in the loop, and passes with the Front backplane by-
   passed.

3. Through IB A, Port 0 (Right), and Backplanes in SPLIT LOOP, verify
   that the Front loop fails with the Front Backplane in the loop, and
   passes with the Front Backplane bypassed.
   

4. Through IB A, Port 1 (Left), and Backplanes in SPLIT LOOP, verify
   that the Rear loop passes.
   

A5000 units that follow this pattern should have the clip checked and then
retested before the backplane or Interface Board are replaced as FRUs.

A5000 units that do not follow this pattern exactly, may have a bad FRU and  
no clip problem, OR may have the clip problem in addition to a bad FRU.


*The clip position may be observed and corrected by following the procedure
 below:


1. Remove the front and rear doors and frames, side skins and top plastics.

2. Remove the top service cover

3. Remove the two screws on the Horizontal Interconnect Board between the 
   EPROM and Handle.

4. Observe the clip position above the L brackets and under the Horizontal 
   Interconnect Board. If the clip is shifted toward the EPROM then it is
   likely on the traces and may be causing the problem.
   
5. With a small screwdriver, shift the clip as far away from the EPROM as 
   possible leaving sufficient room to get the screw back through the hole
   for tightening.

6. Re-test the unit.

7. Re-assemble the unit.

Comments: 

This FIN has been released as INFORMATION ONLY and as such ONLY suggests 
trouble shooting advice. This FIN does NOT require any activity on the
part of any SunService department or field function.

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