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Error Messages and Self-Tests
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Figure 9-1. Screen Test Pattern
To initiate the Terminal Test, press the following keys in
the sequence shown:
II
..
5ervice
key"
OR
..
TERMINAL
TEST
..
TERMINAL
TEST
If a RAM error occurs, a message beginning with the
phrase
"RAM ERROR"
is displayed across the bottom of the
screen. The message contains information identifying the
bad RAM chip(s) and describing the nature of the detected
error condition. In such a case, or for any other error
message, write down the message so you can relate it ac-
curately to your HP Service Representative over the tele-
phone (this allows him
to
arrive prepared with the proper
replacement parts) and then pressCIIII. TheCIIII key clears
the message from the screen and causes the Terminal Test
to proceed with the next subsequent test until all eight of
the tests listed above have been performed. The degree to
which your terminal is usable while waiting for the service
visit will vary according to how many and which RAM
chips are bad and the severity of the error condition.
If the ROM and RAM chips all pass the test but the test
pattern on the screen is malformed, then this would sug-
gest a problem with the video portion of the terminal (the
sweep mechanism, the yoke alignment, and so forth).
User Data Comm Test
The User Data Comm Test is actually a set of tests that
requires the presence of a test hood, a cable with a test hood,
or a modem with local and/or remote data loopback
capability.
To execute the User Data Comm Test, pless the following
keys in the sequence shown:
II
..
"erv1ce
key"
..
DATACOMM
TEST
If either a test hood or a cable with a test hood is present,
the following tests are performed:
1. A control line test.
2. A baud rate test (this test verifies that the baud rate
mechanism is functioning properly within
+
or - 5% of
the configured baud rate).
3. A data loopback test.
If
a modem with local and/or remote loopback capability is
present, then only the data loop back test is performed.
All three tests use an asynchronous configuration and are
performed on whichever port is assigned to the data corom
line by the
Da
t
a
c
om / P
r
i n
t e r configuration parameter cur-
rently stored in non-volatile memory. The baud rate test is
performed at the baud rate specified by the
Baud Rate
configuration parameter currently stored in non-volatile
memory.
If
a modem is used for this test, the "FULL
DUPLEX MODEM" configuration has to be used for the
port being tested.
As with the Terminal Test, the message "TESTING!" is
displayed at the bottom of the screen until the test is
finished or until an error condition occurs. Upon comple-
tion of the test, the data comm port which was tested is
automatically reconfigured according to the data corom
configuration parameters currently stored in non-volatile
memory. As the port is being reconfigured, the RS-232C
Data Terminal Ready (CD) control line will not drop so; if a
modem is attached to the port, a modem disconnect will not
occur.
Note that the User Data Comm Test temporarily disables
the terminal's interrupt system. Data received over the
port while the test is in progress may be lost.
9-3
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