Centron Technologies MS930A, Service Manual

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5 - 1
5. Maintenance and Troubleshooting
This Chapter describes how to check, adjust and troubleshoot the machine with proper
test equipment.
Troubleshooting flow chart leads service personnel to a faulty assembly or to one or a few
suspicious components. When a faulty assembly or component is isolated, it would be
adjusted in accordance with the procedures in this chapter, or be replaced with a good one.
Followings are the topics covered in this chapter ;
. Precautions for troubleshooting
. Test equipment necessary
. Troubleshooting flow charts
. Adjustments of major characteristics
. Cleaning of sealing-head section.
5-1. Precaution
When performing troubleshooting, keep following general precaution ;
* Use proper test equipment and tools.
* Be careful enough not to touch any AC main line.
* Set a current limit at DC power supply to protect RF power transistor.
* Prepare sufficient heatsink for RF board to avoid temperature increase.
* When replacing a component, use proper rated component.
* Be careful not to touch RF circuits and electrodes with your finger when RF is
being generated. You may be shocked and burnt.
CAUTION
- Dangerous high voltage over a hundred volts may exist at RF circuits while
RF is turned on.
- Finger may be burnt by induction heating if it's placed between two electrodes
of sealing-head, or near RF transistors and transformers.