Troubleshooting
Both hardware and software (operational code and configuration) problems can
affect the multiaccess enclosure. Light-emitting diodes (LEDs), diagnostic programs,
and error messages provide information needed for problem determination. This
manual is chiefly concerned with diagnosing and correcting hardware problems.
Chapter 5, “Multiaccess Enclosure Firmware and Operational Code” on page 5-1
has information about accessing the multiaccess enclosure.
Diagnosing Hardware Problems
Generally, errors that occur
before the operational code is loaded are
hardware-related. Light-emitting diodes (LEDs) on the front of the multiaccess
enclosure indicate how the hardware components are functioning.
Go to “LED Indicators” on page 3-2 for LED status and indicators for the
multiaccess enclosure. See Chapter 4, “Multiaccess Enclosure FRU Exchange” on
page 4-1 for information on removal and replacement procedures for
field-replaceable units (FRUs).
See “Using Multiaccess Enclosure Firmware” on page 5-2 to run hardware
diagnostics
before the multiaccess enclosure has been configured.
Note: If you can not load the operational code refer to “Preparing the Multiaccess
Enclosure Hard Disk” on page 3-18.
Diagnosing Operational Code and Configuration Problems
Generally, errors that occurs
after the operational code is loaded indicate problems
with the operational code or configuration file.
Errors generate SRCs which are loaded in the service processor. To see them,
from the service processor display:
1. Click on the 3746-9x0 icon
2. In the 3746-9x0 Menu window, click on the Problem Management
3. In the Problem Management window, double click on the (M) Manage
Alarms/Errors/Events (SRCs) option.
See “Using Operational Diagnostics” on page 5-41 to run hardware diagnostics
after operational code and configuration files have been loaded.
Maintenance Actions and Procedures
Items
Then Go To
Basic Verification
“MAP 0300: Multiaccess Enclosure Basic
Verification” on page 3-6
Parallel Channel problem
“MAP 0310: Parallel Channel Problem
Isolation” on page 3-16
Verifying repair action on Parallel Channel
“MAP 0320: Verifying Repair Action for
Parallel Channel” on page 3-17
External Wrap test on Parallel Channel
Adapter
“External Wrap Testing Parallel Channel
Adapters” on page 3-23
Chapter 3. Multiaccess Enclosure Problem Determination
3-5
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