Seiwa SW AP03 User Manual

Page 45

If these conditions are correct, disconnect all cables except the power and Controller and try
to switch on. If the self-test message now appears, the fault is in one of the attachments.

If these tests do not reveal the problem, another possibility is that the program store
(EPROM) has not been fitted correctly or that a pin is bent or broken. If that is not the
problem, a service call is required.

The steering drive transistors are electronically protected, but can be damaged by extreme
stress. The common symptom is that the steering will drive one way and not the other. Other
types of damage can cause the main fuse to blow when the system is switched from
STANDBY to PILOT.
In such cases, the Junction Box should be returned to your dealer or to Seiwa for repair.

4.4 FUSES
The system has two fuses. The main 20A fuse protects the complete system, while a 0.8A
miniature fuse (See Figs 3.1 and 3.2) protects the control electronics against supply surges.