Komatsu Galeo PC138US-8 Shop Manual page 294

SEN02553-01
Machine monitor
Outline
The machine monitor provides monitor display
q
function, mode selection function and switch
function of the electrical equipment etc. Also it
provides an alarm buzzer.
The machine monitor has a CPU (Central Pro-
q
cessing Unit) in it to process, display, and out-
put the information.
The machine monitor consists of display and
q
switches: the display is of LCD type, and the
switches are of flat sheet switch.
If an error occurs in the machine monitor itself,
q
controller or wiring circuit between monitor and
controller, the monitor does not display prop-
erly.
36
10 Structure, function and maintenance standard
Precautions on the machine monitor display
The LCD panel may have black points (points
q
which are not lighted) and bright points (points
which do not go off) for the reason of its char-
acteristics. If the number of the bright points
and black points does not exceed 10, it does
not indicate a failure or a defect.
When the engine is started, the battery voltage
q
may drop suddenly depending on ambient
temperatures and battery conditions. In this
case, the machine monitor may go off for a
moment. However, this phenomenon is not a
failure.
After the machine monitor is used continu-
q
ously, blue points (points which do not go off)
may be seen on the black background. This
phenomenon does not indicate a failure or a
defect.
Blue points can never be a problem as the
screen has usually blue or white background.
(White in the LCD is made up of red, green and
blue.)
PC138US, USLC-8