7. LOAD READING PROBLEM - continued
Measure pressure transducer signal of amplified output on main board in central unit.
Measure between test point MP15 (analog ground) and MP4 (signal) for piston side
and between test points MP15 (analog ground) and MP5 (signal) for rod side. The
measurements should be between +0.5 volts and +4.5 volts. +0.5 volts with no
pressure (0 psi) in the hydraulic lines (minimum sensor output). +4.5 volts with
maximum pressure (4,410 psi/300 bar). Refer to Drawing 1 and 3 in Section 10 and
Theory 1, 4, and 5 in Section 12.
Main board in central unit defective.
Replace main board in central unit and reset zero point
on pressure transducers.
Refer to Procedures 3 and 4 in Section 11.