Komatsu PC200-8M0 Shop Manual page 302

SEN06123-00
Machine monitor
Function
<li>The machine monitor has monitor display
q
function, mode selection function and switch
function for electrical parts etc. Also it has an
alarm buzzer.
q The machine monitor has a CPU (Central Pro-
cessing Unit) in it to process, display, and out-
put the information.
The machine monitor consists of a display and
q
switches: the display is of LCD type, and the
switches are of flat sheet switch.
If a failure occurs in the machine monitor itself,
q
controller or wiring circuit between monitor and
controller, the monitor does not display prop-
erly.
Precautions on the machine monitor display
<li>One of the features of liquid crystal display
q
panels is that there may be black spots (spots
that do not light up) or white spots (spots that
stay lit up) on the screen. If there are fewer
than 10 black or white spots, this is not a fail-
ure or a defect. Products having 10 or less
black or bright spots conform the product spec-
ification; such the condition is quite normal.
36
10-600
When the engine is started, the battery voltage
q
may drop suddenly, depending on the ambient
temperature and the condition of the battery. In
this case, the machine monitor display may go
off for a moment. However, this phenomenon
is not a failure.
q Continuous operation of the machine monitor
may display blue bright spots on the screen
having a black background; it is quite normal.
Blue bright spots can never be a problem as
the screen has usually blue or white back-
ground. (White in the LCD is made up of red,
green and blue.)
PC200, 200LC, 220, 220LC-8M0
600 Electrical system
Machine monitor system
1