User`s guide

System Initialization and Acceptance Testing (Normal Operation)
4.2 Power-On Self-Tests (POST)
The following modules have one green LED, which indicates that the module is
receiving +5 and +12 Vdc and has passed self-tests:
CXA16
CXB16
CXY08
4.2.3 Power-Up Tests for Mass Storage Devices
An RF-series ISE may fail either during initial power-up or during normal
operation. In both cases, the failure is indicated by the lighting of the red fault
LED on the drive’s front panel. The ISE also has a red fault LED, but it is not
visible from the outside of the system enclosure.
If the drive is unable to execute the Power-On Self-Test (POST) successfully,
the red fault LED remains lit and the ready LED does not come on, or both
LEDs remain on.
POST is also used to handle two types of error conditions in the drive:
• Controller errors are caused by the hardware associated with the controller
function of the drive module. A controller error is fatal to the operation of
the drive, since the controller cannot establish a logical connection to the
host. The red fault LED lights. If this occurs, replace the drive module.
• Drive errors are caused by the hardware associated with the drive control
function of the drive module. These errors are not fatal to the drive, since
the drive can establish a logical connection and report the error to the host.
Both LEDs go out for about 1 second, then the red fault LED lights.
4.3 CPU ROM-Based Diagnostics
The KA52\53\54 ROM-based diagnostic facility is the primary diagnostic
tool for troubleshooting and testing of the CPU, memory, Ethernet, and DSSI
subsystems. ROM-based diagnostics have significant advantages:
• Load time is virtually nonexistent.
• The boot path is more reliable.
• Diagnosis is done in a more primitive state.
The ROM-based diagnostics can detect failures in field-replaceable units
(FRUs) other than the CPU module. For example, they can isolate to two
memory SIMMS. (Table 5–4 lists the FRUs indicated by ROM-based diagnostic
error messages.)
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