IBM RS/6000 SP, Maintenance Information

Page: 257 / 388

MAP 0400: Supervisor Power 12 Volts DC Problem
MAP 0400: Supervisor Power 12 V dc Problem
Problem detected with supervisor power supply 12 V dc:
Ÿ Main power switch LED is On
Ÿ
-OR- PDU rear panel LED is On
Ÿ
-BUT- all frame supervisor LEDs are Off.
Refer to Figure 1-22, for a diagram of the RS/6000 SP +12 V dc supervisor power.
Line
Filter
CB
12v
Power
Supply
Node
Power
Supply
+12v
+12v
LED
J402
J406
+12v
J7
J8
Switch 2 4 6 8 10 12 14
11 13 15
1 3 5
7 9
J408
Supervisor BUS ’B’ Odd Nodes
Supervisor BUS ’A’ Even Nodes
+12v
RS232
LEDs
(Yellow)
(Yellow)
(Green)
(Green)
Supervisor Bus
Communications
RS232 Active
+48v Status
AC Power
Frame
Connector
Card
Frame
Supervisor
Card
Supervisor
Customer
200-240 AC
3 phase
input
Figure 1-22. PDU Supervisor Power + 12 V dc Diagram
001
Problem with supervisor power supply 12 V dc:
Did you get here from “MAP 0110: Supervisor Subsystem” on page 1-10?
Yes No
002
– Check green and yellow LEDs on processor nodes. If none are lit, detach supervisor harness
from one processor node, then reinsert to cause Node Supervisor Self-Test to run. Refer to
"Node/Switch Supervisor Self-Test" in
IBM RS/6000 SP: Maintenance Information, Volume 3,
Locations and Service Procedures for this procedure.
Were any green or yellow LEDs on any processor node lit before or during this test?
Yes No
003
– Go to Step 005 on page 1-238.
004
Chapter 1. Maintenance Analysis Procedures (MAPs)
1-237