Testing With Self-Diagnosis Function - Komatsu PC88MR-10 Shop Manual

Testing with self-diagnosis function

Testing outline
(ALL-Q19Y-360-K-00-A)
The air conditioner controller performs various self-diagnosis such as inside air temperature sensor, outside
air temperature sensor, evaporator temperature sensor, temperature control system, vent (mode) changeover
system, sunlight sensor, and refrigerant pressure with the dual pressure switch. If an error is detected on the
temperature control system, vent (mode) changeover system, or refrigerant, the machine monitor
momentarily shows a warning screen and then "Air conditioner system state monitor" lights up continuously.
a The machine monitor displays the system state monitor "!" when an error occurs in the communication
between the machine monitor and the air conditioner controller.
a The system performs self-diagnosis of various sensors. If any failure is detected, a failure code is
displayed on the "Electrical Systems Abnormality Record" screen in the service mode of the machine
monitor.
a Once a failure is detected in the self-diagnosis, the error condition is not canceled even if the failed part
returns to normal.
Turning the starting switch "OFF" clears a failure.
a FRESH/RECIRC air changeover servomotor is not checked in the self-diagnosis.
How to open the electrical system abnormality record screen in service mode
of the machine monitor
Overview of machine monitor operating procedure
Standard screen
Press [1], [2], and [3] in this order while holding down O [4].
Service menu (Mode)
Press O [F3] twice. Press [F6].
03 Abnormality Record
Press O [F3] once. Press [F6].
02 Electrical systems abnormality record screen
Detailed description of machine monitor operating procedure
1. On the normal operation screen, while pressing number key [4], press [1], [2], and [3] in this order.
2. Validate the selection by pressing [F6].
PC88MR-10
(ALL-Q19Y-001-K-00-A)
(PC220-Q19Y-100-K-00-A)
80 Appendix

Testing with self-diagnosis function

80-39