CHAPTER 1 TROUBLESHOOTING
1.INTRODUCTION
Troubleshooting is the counter measure procedures that the service personnel should follow if an error or malfunction occurs with the machine. It is impossible to anticipate all of the possible troubles which may occur in future and determine the troubleshooting procedures, so this chapter covers some sample troubles. However, those samples will help the service personnel pinpoint and repair other defective elements.
1.1Precautions
Be sure to observe and follow all the precautions to prevent any secondary problems from happening during troubleshooting.
(1)Always turn off the power and unplug the power cable before removing any covers or PCBs, adjusting the machine and so on. If you need to take voltage measurements with the power switched on, take the greatest of care not to receive an electric shock.
(2)When connecting or disconnecting cable connectors, make sure that you hold the connector body and not the cables.
(3)Electronic devices are sensitive to static build up; make sure that you touch a metal portion of the machine to discharge yourself before accessing the PCBs.
Handle PCBs with care when repairing them.
Verify again that the repaired portion works properly.
1.2Initial Check
Check the following items before attempting to repair the machine.
<Operating Environment>
(1)Put your machine on a flat, stable surface such as a desk that is free of vibration and shocks.
(2)Use the machine in a
(3)Ensure the machine is not exposed to direct sunlight, excessive heat, moisture, or dust.
(4)Keep the machine horizontal when you carry it. To prevent injuries when moving or lifting this machine, make sure to use at least two people.
<Power Supply>
(1)The AC input power supply described on the rating plate of the machine should be within ±10% of the rated voltage.
(2)The AC input power supply is within the regulated value.
(3)The cables and harnesses are connected correctly.
(4)The fuses are not blown.
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