TROUBLESHOOTING
8 - 7
confirm the change,
[N/-]
or
[MODE
] key to abandon the
changes.
9) Adjust Back Light Threshold
This display can be used to calibrate the LCD back light turn
on and off threshold. Use the following steps to adjust the
back light threshold.
1. The present ambient light level is displayed on the first
row: “Light = xxx.” The current back light threshold
value is displayed on the second row: “Trigger = yyy +/-.”
In a brightly lit room, the light reading should be above
120.
2. The user can block the light sensor, which is located at
the upper left corner of the monitor, with a finger and
watch the light sensor reading. The light reading should
drop to less than 100. Determine the ambient light level
when the back light should be turned on and record the
light sensor reading.
3. Use
[Y/+]
or
[N/-]
key to increase or decrease the trigger
value until it is about the same as the previously recorded
light sensor reading. Press
[MODE]
key to exit this
display. If the threshold value is changed, a message
“Save new light threshold?” will appear. Press
[Y/+]
to
confirm the change,
[N/-]
or
[MODE
] key to abandon the
changes.
10) Serial Number and Pump Toggle
This display shows the unit serial number.
If a pump is installed and pump speed control circuit
available, the display “Pump=Low/(High)” may be toggled by
pressing the
[N/-]
key. Note that changes made here are
