TABLE 3-1. DIRECT AND GENERAL SUPPORT TROUBLESHOOTING (CONTD)
Test or Inspection
INTERFERENCE PROBLEM (ERROR CODES E91, E92, E93 OR E94 INTERMITTENT)
Step 1. Check data transfer between CPU and Console (Refer to Malfunction No. 87). If OK go to Step 2.
Repair or replace defective part(s).
Step 2. Check that additional ground link between CPU main board terminal X9/1 and CPU mounting bracket is in place.
If OK go to Step 3.
Install 2ground link (single cable minimum of AWG14 (2.0 mm 2)).
Step 3. Ensure that cable shields are connected properly. (Refer to pages 3-87, 3-88 and 3-89.) If OK go to Step 4.
Connect cable shields correctly.
Step 4. Determine which component of crane electric system is spiking out (e.g. dump valve, outrigger relay).
Install diode or varistor across terminals of spiking component. Diode type such as IN4001 can be used
(watch + and - connection for diode).
ERROR CODE E05 DISPLAYED ON CONSOLE
Step 1. Boom length range exceeded.
Length sensor adjustment changed. (Refer to Malfunction No. 85.)
ERROR CODE E07 DISPLAYED ON CONSOLE
Step 1. No acknowledgment signal from overload relay (K1).