Komatsu PC88MR-10 Shop Manual page 293

Function
The monitor system keeps the operator informed of all the machine conditions, by monitoring them by
using the sensors and switches installed in various parts of the machine and processing them instantly to
display on the machine monitor.
The information displayed on the machine monitor falls into the following types:
1. Alarm when the machine has problem
2. Machine status display (coolant temperature, hydraulic oil temperature, fuel level, etc.)
3. Display of camera image
The switches on the machine monitor have functions to control the machine.
Machine monitor
Function
The machine monitor has monitor display function, mode selection function and switch function for
electrical parts etc. Also it has an alarm buzzer.
The machine monitor has a CPU (Central Processing Unit) in it to process, display, and output the
information.
The machine monitor consists of a display and switches: the display is of LCD type, and the switches are
of flat sheet switch.
If a failure occurs in the machine monitor itself, controller or wiring circuit between monitor and controller,
the monitor does not display properly.
Precautions on the machine monitor display
One of the features of liquid crystal display 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 failure or a defect. Products having 10 or less black or bright spots conform the product
specification; such the condition is quite normal.
When the engine is started, the battery voltage 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.
Continuous operation of the machine monitor may display blue bright spots on the screen having a black
background; it is quite normal.
PC88MR-10
(PC-Q180-042-K-01-A)
10 Structure and function
Machine monitor system
10-215