Metrohm 730 Sample Changer - Manuel (Page 172)

5.4 Diagnosis
730 Sample Changer, Appendix
169
5.4.3 Working Memory (RAM)
This diagnosis step completes a non-destructive test over the en-
tire range of the RAM contents (working memory).
• Prepare instrument for diagnosis (see chapter 5.4.2).
• If necessary, press <ê> several times until
diagnosis
>RAM test
• <ENTER>
If no errors are found, this appears on the display:
>RAM test
RAM test ok
• <ENTER>
diagnosis
>display test
5.4.4 Display
With this diagnosis step, the functionality of the LED’s and the dis-
play is tested.
• Prepare instrument for diagnosis (see chapter 5.4.2).
• If necessary press <ê> several times until
diagnosis
>display test
• <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.”
• The test run can be stopped and started again by pressing the
<5> key.
• The test can be exited with the <QUIT> or <STOP> keys.