E-19 Function Switch Does Not Work - Komatsu PC88MR-10 Shop Manual

E-19 Function switch does not work

Failure Function switch does not work.
Signal of function switch can be checked with monitoring function.
Related
(Code: 04503)
information
No. Cause
Defective machine
1
monitor
PC88MR-10
Procedure, measuring location, criteria, and remarks
Machine monitor may be defective. (Since this is an internal defect,
troubleshooting cannot be performed.)
Troubleshooting of electrical system (E-mode)
(PC88MR-HBC-400-A-Z0-A)
40 Troubleshooting
40-407