User guide

6.4 Diagnosis
788 IC Filtration Sample Processor
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6.4.3 Working memory (RAM)
This diagnosis step completes a non-destructive test over the entire
range of the RAM contents (working memory).
x
Prepare instrument for diagnosis (see
section 6.4.2
).
x
If necessary, press <
Ð
> several times until
diagnosis
>RAM test
x
<ENTER>
If no errors are found, this appears on the display:
>RAM test
RAM test ok
x
<ENTER>
diagnosis
>display test
6.4.4 Display
With this diagnosis step, the functionality of the LED’s and the display is
tested.
x
Prepare instrument for diagnosis (see
section 6.4.2
).
x
If necessary press <
Ð
>several times until
diagnosis
>display test
x
<ENTER>
After pressing the <ENTER> key, the program automatically makes a test run to visually check
the LED’s and the display.
 The LEDs for
TOWER 1
,
TOWER 2
and
LEARN
blink one after the other for a short time.
 The background lighting of the display is switched off for a short time and then turned on again.
 The start test pattern appears (every pixel active).
 Both lines of the display are turned off.
 Both lines of the display are occupied one after the other with the characters “#”, “
H
“ and finally
“I”.
 Both lines are filled from right to left with the endless running line
“0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ.”.
x
The test run can be stopped and started again by pressing the <5>
key.
x
The test can be exited with the <QUIT> or <STOP> keys.