IBM pSeries 690 Service Manual page 921

L3 Cache Shorts Test, Step 2:
Meter "COM" to Test Card either "COMMON RET" (Black Jack)
Install another L3
cache module
[U1.18-P1-Cx]
Is the left Side
Yes
of the equation
greater than 1
Ohm?
Reject the L3
cache module
D
C
Connect Meter
"V" to Test Card "1.9V L3 LGA" (Blue Jack)
Record Resistance.
Call this resistance" 1.9v L3 Total Resistance"( 1.9vL3TR)
Enter recorded Fail Criteria *, MLR, 1.9vL3TR in the
equation below
1.9vL3TR - MLR > Fail Criteria
Is the left Side of
Yes
the equation Greater
than the Right Side?
Examples:
0.10 > 0.40 Follow NO (Fail)
0.90 > 0.40 Follow YES (Pass)
NO
Contact Next
DO NOT POWER
ON
Level Of Support
Yes
Disengage One I/O Book
Primary I/O Book First
Secondary I/O Books second
NO
Yes Has this L3
been removed &
reinstalled
Are all the
NO
memory & I/O
disengaged?
Are all
Yes
The Memory
Disengaged?
Disengage A Memory Book
Memory are removed one at a time
Chapter 9. Removal and Replacement Procedures
Reinstall the
L3 cache module
NO
Remove L3
cache module
Inspect Interposer
for shorts
Yes
NO
Are Shorts
Visible?
NO
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