IBM iSeries 270 Service Manual page 142

5. Are all the memory and NIC cards disengaged?
v No: Continue with the next step.
v Yes: Do not power on the system. Contact your next level of support.
This ends the procedure.
6. Are all the memory disengaged?
v No: Disengage a memory book (memory is removed one at a time). Then, go to step 2 (See page
129).
v Yes: Disengage one NIC card (primary NIC card first, secondary NIC cards second). Then, go to
step 2 (See page 129).
7. Has this L3 been remove and reinstalled?
v No: Remove the L3 cache module, and inspect the interposer for shorts. Continue with the next
step.
v Yes: Go to step 9 (See page 130).
8. Are shorts visible?
v No: Reinstall the L3 cache module and go to L3 cache shorts test, procedure 2 (See page 129).
v Yes: Reject the L3 cache module, install another L3 cache module. Then, go to L3 cache shorts
test, procedure 2 (See page 129).
9. Are all the memory and NIC cards disengaged?
v Yes: Reject the L3 cache module, install another L3 cache module. Then, go to L3 cache shorts
test, procedure 2 (See page 129).
v No: Are all the memory disengaged?
– Yes: Disengage one NIC card (primary NIC card first, secondary NIC cards second), then go to
step 2 (See page 129).
– No: Disengage a memory book (memory are removed one at a time. Then, go to step 2 (See
page 129).
L3 cache shorts test, procedure 4
1. Choose from the following options:
v If you are using the new capacitor card option: Connect the meter "V" to Capacitor book TP-3
(L3-L) and Meter COM to Capacitor book TP-4 (L3-D).
v If you are using the short-circuit test tool option: Connect the meter "V" to test card "1.9v L3 LGA"
(blue jack), and meter "COM" to test card either "1.5V" (white jack).
2. Record the resistance reading on your meter while the leads are attached to the shorts test card. Call
this resistance "1.9 to 1.5 L3 Total Resistance" (1.9/1.5L3TR).
3. Enter recorded 1.9/1.5L3TR, MLR, 1.9vL3TR, 1.5vL3TR in the equation: 1.9/1.5L3TR - MLR >
(1.9vL3TR - MLR + 1.5vL3TR - MLR - 0.4).
Note: The same equation in a different form: 1.9/1.53T3 > (1.9vL3TR + 1.5vL3TR - MLR - 0.4).
4. Is the left side of the equation greater than the right side?
v No: Continue with the next step.
v Yes: Are all the L3 cache modules installed?
– Yes: Go to L3 cache testing, procedure 5 (See page 131).
– No: Install another L3 cache module, and go to L3 cache testing, procedure 2 (See page 129).
5. Has this L3 been removed and reinstalled?
v No: Continue with the next step.
v Yes: Reject the L3 cache module, and install another L3 cache module. Then, go to L3 cache
testing, procedure 2 (See page 129).
6. Remove the L3 cache module, and inspect the interposer for shorts.
7. Are shorts visible?
130
Hardware (Remove and Replace; Part Locations and Listings)