TM 10-3930-675-24-1
TOPHANDLER SLEWING TROUBLESHOOTING
THIS WORK PACKAGE COVERS
Error Code 256 - Tophandler Clockwise Slewing, Com-
Error Code 128 - Joystick-to-ECU (790) Failure
ponent Failure
Error Code 130 - Overload Protection System Failure
Error Code 258 - Tophandler Counterclockwise Slew-
Error Code 255 - Tophandler Clockwise Slewing, Wir-
ing, Wiring Circuit Failure
ing Circuit Failure
Error Code 259 - Tophandler Counterclockwise Slew-
ing, Component Failure
INITIAL SETUP
References
TM 10-3930-675-10
Current Supply (A34738.0200) (WP 0048 00-31)
ECS Electrical Servo (A34648.0200) (WP 0048 00-
5)
ECS Attachment (A34652.0200) (WP 0048 00-23)
NOTE
Refer to WP 0004 00 for additional troubleshooting guidance, information, and illustrations that
locate critical components.
Refer also to illustrations at end of work package for component location.
Table 1. Error Code 128 - Joystick-to-ECU (790) Failure Troubleshooting Procedures.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Error Code 128 - Joystick-to-ECU (790) Failure. 1. Enter diagnostic menu "DIAG a. Operate the joystick slewing
SERVO 6(13)" and check
CW and CCW function
SLEW CW/CCW voltage.
slowly. Should have 1 to 9V
Voltage should be around 5V
over the full range of function.
with no joystick activations.
If the voltage suddenly goes
out of range, replace joystick
(WP 0082 00).
b. If no voltage (5V) is found,
continue with step 2.
2. Inspect ECU (790) connector a. Repair or replace damaged
1. Check connector, harness
wires or connectors (WP 0113
and ECU (790) for damage.
00).
Check ECU tray ground wires. b. Replace damaged ECU (790)
(WP 0080 00).