PFW1540: Problem isolation procedures

The PFW1540 procedures are used to locate problems in the processor subsystem or I/O subsystem(s).

If a problem is detected, these procedures help you isolate the problem to a failing unit. Find the symptom in the following table; then follow the instructions given in the Action column.

Problem Isolation Procedures
Symptom/Reference Code/Checkpoint	Action
You have or suspect an I/O card or I/O subsystem failure.You received one of the following SRNs or reference codes: 101-000, 101-517, 101-521, 101-538, 101-551 to 101-557, 101-559 to 101-599, 101-662, 101-727, 101-c32, 101-c33, 101-c70	Go to PFW1542: I/O problem isolation procedure.
The service processor on your Model 590 or Model 595 posts a failure and halts the IPL before the server firmware standby is reached. The server logs an error code indicating a problem with one of the MCMs.	Go to PFW1543: Model 590 and model 595 MCM problem isolation procedure.
The service processor on your Model 590 or Model 595 posts a failure and halts the IPL before the server firmware standby is reached. The server logs an error code indicating a memory subsystem failure.	Go to PFW1546: Model 590 and model 595 Memory problem isolation procedure.
You have or suspect a memory or processor subsystem problem on a server other than a Model 590 or Model 595. You received the following SRN or reference code: 101-185	Go to PFW1548: Memory and Processor Problem Isolation Procedure.
If you were directed to the PFW1540 procedure by an SRN and that SRN is not listed in this table.	Go to PFW1542: I/O problem isolation procedure.

FRU identify LEDs

Your system is configured with an arrangement of LEDs that help identify various components of the system. These include but are not limited to:

Rack identify beacon LED (optional rack status beacon)
Processor subsystem drawer identify LED
I/O drawer identify LED
RIO port identify LED
FRU identify LED
Power subsystem FRUs
Processor subsystem FRUs
I/O subsystem FRUs
I/O adapter identify LED
DASD identify LED

The identify LEDs are arranged hierarchically with the FRU identify LED at the bottom of the hierarchy, followed by the corresponding processor subsystem or I/O drawer identify LED, and the corresponding rack identify LED to locate the failing FRU more easily. Any identify LED in the system may be flashed; refer to Managing your server using the Advanced System Management Interface.

Any identify LED in the system may also be flashed by using the "Identify and Attention Indicators" task through the AIX® diagnostic programs. The procedure to use the Identify and Attention Indicators task in the AIX diagnostics is outlined in "Tasks and Service Aids" in Working with AIX diagnostics.