Metrohm 788 IC Filtration Sample Processor - Manual (Page 151)

6.4 Diagnosis
788 IC Filtration Sample Processor
143
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
If no errors are found, this appears on the display:
>RAM test
RAM test ok
x
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
After pressing the key, the program automatically makes a test run to visually check
the LED’s and the display.
Ÿ The LEDs for TOWER 1, TOWER 2 and LEARN blink one after the other for a short time.
Ÿ The background lighting of the display is switched off for a short time and then turned on again.
Ÿ The start test pattern appears (every pixel active).
Ÿ Both lines of the display are turned off.
Ÿ Both lines of the display are occupied one after the other with the characters “#”, “H“ and finally
“I”.
Ÿ 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 or keys.