7. LOAD READING PROBLEM
PROBLEM: Load reading incorrect.
Check selected operating mode (code on operating mode switch).
Select operating mode switch to correct position (see operating mode in
load chart) between test point MP15 (ground) and MP2 (-5V). Refer to
Theory 1 in Section 12. If incorrect, replace main board and reset
pressure channel. Refer to Drawing 3 in Section 10 and
Procedures 3 and 4 in Section 11.
Check boom length reading on display.
Reset length potentiometer. With fully retracted boom, turn
potentiometer axle counter-clockwise until it reaches a soft stop.
(See Section 6.) Refer to Procedure 5 in Section 11.
Measure radius and check with the displayed radius.
Check if mechanical adjustment of angle sensor is correct.
Angle sensor box should be in line with boom and
adjusted to actual boom angle. Refer to Procedure 5 in Section 11.
Check power supply to pressure transducers (rod and piston side). Unplug each transducer cable
from transducer. Measure at each pressure transducer cable connection between terminals B
(ground) and C (-5V) and between terminals B (Ground) and A (+5V). Refer to Drawings 1 and 19
in Section 10.