IBM 270, Service Manual

Page: 141 / 622

v
No: Install the first L3 Cache Module (M03, M04, M09, M10) (M12, M13, M05, M06) (M22, M23,
M28, M29) (M26, M27, M19, M20), working
v top to bottom. Then, continue with L3 cache testing, procedure 2 (See page 129).
L3 cache shorts test, procedure 2
1. Choose from the following options:
v
If you are using the new capacitor book option: Connect the meter
″
V
″
to Capacitor book TP-3
(L3-L) and Meter
″
COM
″
to Capacitor book TP-5 (RTN).
v If you are using the short-circuit test tool option: Connect the meter
″
V
″
to test card 1.9V L3 LGA
(blue jack). Meter COM to test card, either
″
COMMON RET (black jack).
2. Record resistance, call this resistance
″
1.9v L3 total resistance
″
1.9v L3TR.
3. Enter recorded fail criteria *, MLR, 1.9 vL3TR in the equation: 1.9vL3TR - MLR > Fail criteria.
4. Is the left side of the equation greater than the right side?
v No: Continue with the next step.
v
Yes: Is the left side of the equation greater than 1 Ohm?
– Yes: Go to L3 cache testing, procedure 3 (See page 129).
– No: Contact your next level of support.
This ends the procedure.
5. 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 7 (See page 129).
6. Are shorts visible?
v
No: Reinstall the L3 cache module and go to step 2.
v Yes: Reject the L3 cache module, install another L3 cache module (M03, M04, M09, M10) (M12,
M13, M05, M06) (M22, M23, M28, M29) (M26, M27, M19, M20). Then, go to step 2 (See page 129).
7. Are all the memory and network interface controller (NIC) cards disengaged?
v
Yes: Reject the L3 cache module, install another L3 cache module (M03, M04, M09, M10) (M12,
M13, M05, M06) (M22, M23, M28, M29) (M26, M27, M19, M20). Then, go to step 2 (See page 129).
v No: Are all the memory disengaged?
– Yes: Disengage one network interface controller (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 3
1. Choose from the following options:
v
If you are using the new capacitor book option: Connect the meter
″
V
″
to Capacitor book TP-4
(L3-D) and Meter
″
COM
″
to Capacitor book TP-5 (RTN).
v If you are using the short-circuit test tool option: Connect meter V to test card 1.5v L3 LGA (white
jack), and meter COM to test card either COMMON RET (black jack).
2. Record resistance, calling it 1.5v L3 total resistance (1.5vL3TR).
3. Enter recorded fail criteria *, MLR, 1.5vL3TR in the equation: 1.5vL3TR - MLR > Fail criteria.
4. Is the left side of the equation greater than the right side?
v No: Continue with step 7 (See page 130).
v
Yes: Is the left side of the equation greater than 1 Ohm?
– Yes: Go to L3 cache testing, procedure 4 (See page 130).
– No: Continue with the next step.
Analyze hardware problems
129