IBM RS/6000 SP, Maintenance Information

Page: 48 / 388

MAP 0120: Supervisor Bus Problem
047 (continued)
Ÿ Set B -> PDU-BH-J8
– Replace supervisor harness A or B, depending on which Set had original problem (reference Step
044 on page 1-27).
– Go to Step 053 on page 1-29 to verify fix.
048
– Return supervisor harnesses to original connector locations:
Ÿ
Set A -> PDU-BH-J7
Ÿ Set B -> PDU-BH-J8
Does this frame have a SEPBU?
Yes No
049
Attention: High energy present. Do not touch 48 V dc busbars. Shorting will result in system
outage.
– Open Power Distribution Unit dc panel to access the connector card. This can be done with frame
power on.
– Swap cables at connector card PDU-FC-J406 and PDU-FC-J408.
– Perform "Verification Test for Supervisor Bus" in
IBM RS/6000 SP: Maintenance Information,
Volume 3, Locations and Service Procedures.
– Check system monitor log from the control workstation.
Did the failing addresses move to other Set?
Yes No
050
– Return the cables to original connector locations:
Ÿ
PDU-BH-J7 to Connector card PDU-FC-J406
Ÿ PDU-BH-J8 to Connector card PDU-FC-J408
– Replace cable PDU-FC-P406 (Set A) or PDU-FC-P408 (Set B), depending on which Set
originally failed.
– Go to Step 053 on page 1-29.
051
– Replace connector card (refer to "FRU Removals and Replacements" in IBM RS/6000 SP: Main-
tenance Information, Volume 3, Locations and Service Procedures).
– Go to Step 053 on page 1-29.
052
Problem isolated to SEPBU power chassis.
DANGER
High voltage present. Perform “Lockout/Tagout Procedure for PDU” on page 1-2 or
“Lockout/Bagout Procedure for PDU” on page 1-3 to remove primary power to the frame.
(Step 052 continues)
1-28
RS/6000 SP MAPs