IBM 270, Service Manual

Page: 142 / 622

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)