Service manual

REPAIR
SERVICE MANUAL
Troubleshooting
3-1
PART II REPAIR
CHAPTER 3 TROUBLESHOOTING
1. Introduction
This chapter explains troubleshooting procedures for the word processor. Since it is
impossible to troubleshoot all instances of a problem, only a limited number of cases
are presented. Thorough understanding of the procedures given in each section is
essential for efficient troubleshooting, and can provide a good insight to the problem.
2. Precautions
2.1. Personal Safety
If there is chance of electrical shock, this symbol will precede any
instructions in this manual. Follow the safety advice carefully!
In addition to any specific warnings as described above, be sure to take the following
precautions for your personal safety:
• Unplug the AC adapter from the AC outlet before removing the covers and PCBs, or
before making any mechanical adjustments.
• Unplug the AC adapter from the AC outlet before checking continuity.
• When disconnecting a connector, grasp it firmly. Do not pull on the connector's lead
wires. If the connector has a lock mechanism, unlock it before trying to disconnect it.
2.2. Handling ESD-Sensitive Parts
Many electronic products use parts that are known to be sensitive to electrostatic
discharge (ESD). To prevent damage to ESD-sensitive parts, observe the caution
symbols throughout these instructions, as well as the additional precautions below.
WARNING: