Hanna Instruments HI 504 - Manual (Page 48)

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For example, if SETUP and æ keys are pressed together the
LCD will look like this:
Note A maximum of two keys may be pressed simultaneously to
be properly recognized.
• To exit the keyboard test procedure press LCD, CAL and
SETUP simultaneously; the instrument will remain in the
setup menu and move to the next item (t.02).
EEPROM SELFTEST
The EEPROM selftest procedure involves verifying the stored
EEPROM checksum.
• To enter the EEPROM test procedure select the setup item
t.02 and an “OFF” blinking message will appear on the
LCD.
• Press the æ (or ) key once and the message will switch to
a blinking “GO”.
• Press CFM key to confirm or the æ (or ) key again to
return to the previous status.
• If confirmation is given when the “OFF” message is blink-
ing, no action is performed and it will move to the next
setup item (t.03).
• After confirmation, the selftest pro-
cedure begins with the “tESt”
message blinking for a few seconds.
• The display test is announced by a scrolling “Display test”
message.
• All the segments light up for a
few seconds and then switch off
before exiting the display test pro-
cedure and moving to the next
setup item (t.01).
KEYBOARD TEST
• To enter the keyboard test procedure select setup item t.01.
A blinking “OFF” message will appear on the primary LCD.
• Press the æ (or ) key once and the message will switch to
a blinking “GO”.
• Press CFM to confirm or the æ (or ) key again to return
to the previous state.
• If confirmation is given when the “OFF” message is blink-
ing, no action is performed and it will move to the next
setup item (t.02).
• Once confirmed, the keyboard selftest procedure begins
with the scrolling message “Button test - Press LCD and
CAL and SETUP together to escape”.
• The LCD will then show only a
colon.
• As soon as one more key is pressed, the appropriate seg-
ment out of 88:88 corresponding to the pressed key will
light up on the screen.