TM 5-3810-307-24-1-2
7. LOAD READING PROBLEM - continued
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Check power supply at connection board in central unit between X1:14 (gnd)
Correct?
NO
to X1:13 (-5.0v) and X1:14 (gnd) to X1-15(+5.0v) for rod side. Measure
between X1-19 (gnd) to X1-18 (+5.0v) and X1-19 (gnd) to
X1-20 (-5.0v) for piston side. Refer to Drawing 1, 3, 20 in Section 10.
Fault in pressure transducer cable.
YES
Correct?
YES
Refer to Drawing 1 in Section 10.
Main board in central unit defective.
Replace main board and reset zero point
NO
on pressure transducers. Refer to
Drawing 3 in Section 10 and Procedures
3 and 4 in Section 11.
Measure signal from pressure transducers in central unit connection board between X1:14 (gnd)
and X1-16 (signal) for the rod side and between X1:19 (gnd) and X1-21 (signal) for the piston side.
The measurements should be between 0.0 volts and 1.0 volt (0.025 volt).
0.0 volts with no pressure (0 psi) in the hydraulic lines (minimum sensor output).
1.0 volt (0.025 volt) 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.
Check continuity of signal wire and Pin D of pressure transducer(s).
Correct?
NO
First, unplug transducer cable(s) from transducer(s). Second, move
the respective YEL wire(s) connected to X1:16 (rod side) or X1:21
(piston side) on the connection board in the central unit to AGND
terminal X1:14 (rod side) or X1:19 (piston side). Measure Voltage
YES
at the pressure transducer cable connection(s) between
terminals D (ground) and A (+5v). The measurement should be
+5.0 volts. Reconnect respective YEL wire(s) to X1:16 (rod side)
or X1:21 (piston side) on the connection board in the central unit and
reconnect transducer cable(s). Refer to Drawing 1 in Section 10.
Fault in pressure transducer cable(s).
Correct?
NO
Refer to Drawing 1 in Section 10.
Adjust zero point on pressure transducers.
YES
Refer to Procedure 4 in Section 11.
If pressure transducer(s) are not adjustable,
replace pressure transducer(s) and adjust zero
point. Refer to Drawing 1 in Section 10 and
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Procedure 4 in Section 11.
G-22 Change-1
