IBM i 830, Repair Manual

Page: 29 / 1000

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If you suspect that the air at the system site is too hot or too cold, you need a
thermometer to check the temperature.
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If you suspect the moisture content of the air at the system site is too low or too
high, use a wet/dry bulb to check the humidity. See “General Intermittent
Problem Checklist” on page 16 for more information.
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If you need to check AC receptacles for correct wiring, you need an ECOS**
tester, Model 1023-100, or equivalent tester. The tester lets you quickly check the
receptacles. If you cannot find a tester, use an analog multimeter instead. Do not
use a digital multimeter.
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To send data with a Licensed Internal Code Trouble Report (LICTR), you need a
blank tape for a storage dump. Since you cannot predict when you might need a
blank tape, you should always keep a blank tape available.
How to Use This Intermittent Problem Section
You are here because of intermittent problems.
Follow the steps in this procedure to correct an intermittent problem.
1. Read all of the information in “Correcting Intermittent Problems” before you
attempt to correct an intermittent problem. Then continue with the next step of
this procedure.
2. Perform ALL steps in the “General Intermittent Problem Checklist” on page 16.
Then return to this step of this procedure and answer the following question.
Did you correct the intermittent problem?
No Yes
↓
This ends the procedure.
3.
Go to “How to Analyze the Intermittent Problem” on page 20.
This ends the procedure.
Correcting Intermittent Problems
What Is an Intermittent Problem?
An intermittent problem is a problem that occurs for a short time, and then goes
away. The problem may not occur again until some time in the future, if at all.
Intermittent problems cannot be made to appear again easily.
Some examples of intermittent problems are:
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An system reference code (SRC) occurs on the control panel (the System
Attention light is on) but disappears when you power off, then power on the
system. An entry does not appear in the Product Activity Log.
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An entry appears in the problem log when you use the Work with Problems
(WRKPRB) command. For example, the FC 5032 I/O Card Unit becomes
powered off, but starts working again when you power it on.
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The workstation I/O processor is in a hang condition but starts working
normally when you enter Vary Configuration command (
VRYCFG *CTL
RESET(*YES)
).
Hints for Correcting Intermittent Problems
An intermittent problem can show many different symptoms, so it may be difficult
for you to determine the real cause without completely analyzing the failure. To
help with this analysis, you should determine as many symptoms as possible.
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The complete SRC and unit reference code (URC) information is necessary to
determine the exact failing area and the probable cause.
Intermittent Problems
Chapter 1. Starting Problem Analysis
15