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8.1.1
Problem Analysis
1.
R.ad
Comm.nts. Determine the customer's concern, if possible. Frequently the customer
in-
cludes with the computer a message desaibing the problem.
• If the message indicates a problem with a particular section of the computer, you may need to
test only that section. However, you should do a complete verification of the computer after
you have repaired it.
• If the message indicates a problem with a
peripheral
(rather than with the computer itself), test
the Integral
PC
I/O
circuitry
and the corresponding interface. You also need to test the periph-
eral (refer to its service manual).
2. Ob.erve Symptom •• If possible, try to observe the trouble by duplicating the situation described.
Determine how the observed or reported behavior diffelS from the proper behavior. (Also take
note of functions that work properly.) You may' want to run the tests of the customer diagnostic
disc
to verify a reported error condition.
3. . . , .... t.
Probl.ms. Separate the symptoms into distinct problems. Use the troubleshooting pro-
cedure below to correct one problem at a time, starting with the more critical system functions.
4. Consider
C.u •••. Consider possible causes (or each problem. Keep them in mind as you perform
the troubleshooting procedure.
8.1.2 Turn-On Self Tests
Prepare the computer as described in chapter 3, then turn on the power. The normal power-on se-
quence
is
as follows:
• The disc drive light blinks.
• The yellow attention LED on the printer switch panel blinks twice.
• The display lights up.
• The printhead sweeps twice and stops at the home position .
.. • The IICOpyright window' appealS at the bottom of the display after several seconds.
The turn-on self tests run automatically whenever the power is turned on with the operating system
installed.
An
error message will
be
displayed· in the copyright window if any self test is failed.
If
the
copyright window shows no error messages, all of the self tests were passed.
If the computer does not appear to come on when you tum on the power
(if
you see no display
activity within 20 seconds), follow the procedure given in table 8-2, lurn-On Problems.-
Not •• An
interface or memory module installed in an external I/O port may prevent the com-
puter from turning on. If the customer has sent any interfaces or memory modules with the
unit, try the turn-on self test
first
with them installed. If the computer doesn't turn on cor-
rectly, remove the interfaces or modules one at a time (always turn off the power before
removal), repeating the turn-on test after each removal. If the computer turns on correctly,
troubleshoot the interface or memory module that you have just removed.
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