ULNZ3
For use by authorized service providers.
The problem may be a communications line problem.
When a workstation is attached to the system through modems, it may fail or lose communication with the
system for various lengths of time. This is due to a communications line problem.
Refer to the modem service information to determine how to test the modems and verify that the
communications line between the modems is working correctly.
ULNZ4
For use by authorized service providers.
Independent workstation and SDLC support.
The system considers an independent workstation to be an attached remote system when it is attached
using PC Support asynchronous communications on an ASCII workstation controller.
Perform the following:
v See the ASCII Work Station Reference, SA41-3130-00 information for instructions on how to verify that
the remote system (independent workstation) that is attached to the failing port is a supported device.
v See the device hardware maintenance and service information for instructions on how to verify that the
device is working correctly.
UNP20
For use by authorized service providers.
The internal code of the I/O card that detected the error may be defective.
Perform the following:
1. Replace the suspected card.
2. If the failure occurs again, contact your next level of support and report the problem.
This ends the procedure.
UPLF1
For use by authorized service providers.
The system may not have been able to complete the APPN session initiation due to the number of jobs
that were active when the timeout occurred.
The timeout condition could have been caused by a system performance problem. System performance
could be impacted by the capacity of the system. System performance can also be impacted by
processing requests from other systems in the network.
For capacity planning and system performance information, refer to LPS: Performance Tools for AS/400,
GC41-5055-00.
UPSUNIT
For use by authorized service providers.
The uninterruptible power supply (UPS) may be the failing component.
The air moving device (AMD) in the UPS will be stopped when the UPS is not running on batteries or is
charging the batteries on an FC 5033, FC 5034, or FC 5035.
476 iSeries: iSeries Server 270, 800, 810, 820, 825, 830, 840, 870, 890, SB2, and SB3 Hardware Problem Analysis and
Isolation
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