Manual

6.5 Diagnosis
711 Liquino, Instructions for use
152
6.5.4 Check working memory (RAM)
This diagnosis step carries out a non-destructive test of the whole of the
RAM contents (working memory).
• Prepare instrument for diagnosis (see Sect. 6.5.3).
• If necessary press key <9> several times until
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di agnosi s
> RAM t e s t
• <ENTER>
 The test proceeds automatically. If no faults are found the display
shows:
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> RAM t e s t
RAM TEST OK
• The test is exited by pressing the <STOP> key.
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6.5.5 Check display
This diagnosis step allows the functioning of the LEDs and the display to
be checked.
• Prepare instrument for diagnosis (see Sect. 6.5.3).
• If necessary press key <9> several times until
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• <ENTER>
 When the <ENTER> key is pressed the program automatically car-
ries out a test run for an optical check of the LEDs and display.
a) The LEDs DOS 1, DOS 2, DOS 3 and DOS 4 are switched off and on
several times in sequence.
b) The background lighting is switched off and on several times in se-
quence.
c) Switch-on test pattern appears (each pixel is active).
d) Both display lines are deleted.
e) Both display lines are written in sequence with the characters “#“, “H“
and finally with “I “.
f) Both lines are written from right to left with the endless text
“0123456789ABCDEFGHI JKLMNOPQRSTUVWXYZ“.
• The test run can be interrupted by pressing any key (except
<STOP>) and then restarted.
• The test is exited by pressing the <STOP> key twice.
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>di spl ay cont r ast t est