TROUBLESHOOTING / Diagnosing Procedure DIAGNOSING PROCEDURE These six basic steps are essential for efficient troubleshooting. 1. Study the system Study the machine's technical manuals to know what the system construction and functions are, how it works, and what the system component specifications are.
Fuse failure is often caused by a fine crack in the fuse. Such fine cracks are very hard to detect by visual inspection. Be sure to check for fuse failures only with a tester.
2. Ask operator Get the full story and history from the operator. ・Operating Conditions: Find out what type of work the machine has been applied to and if the machi-ne has been operated correctly. ・Trouble Occurrence Time: Check when the ma-chine had the trouble, i.e. morning, etc. ・Symptom: Check what the character of the trouble was, and if the trouble appeared suddenly or was getting worse gradually.
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・Past Record of Failure: Check if the machine had any other trouble previously and which parts have been repaired or replaced before. 3. Perform Essential Inspection Before starting the troubleshooting, perform the daily maintenance points as described in the Operator's Manual. Check the electrical system for any failures such as low battery voltage, loose connections, blown fuses. Any electrical system failure may affect the machine control performance, resulting in overall malfunction of the machine. If the troubleshooting is started without noticing a blown fuse, the results of the troubleshooting may reach an incorrect conclusion, causing the loss of a lot of time.
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