Brother International MFC-9850 Service Manual - Page 189
TROUBLESHOOTING, 2.1 Introduction, 2.2 Precautions, 2.3 Checking prior to Troubleshooting
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2. TROUBLESHOOTING 2.1 Introduction This section gives the service personnel some of the troubleshooting procedures to be followed if an error or malfunction occurs with the machine. It is impossible to anticipate all of the possible problems which may occur in future and determine the troubleshooting procedures, so this section covers some sample problems. However, those samples will help service personnel pinpoint and repair other defective elements if he/she analyzes and examines them well. 2.2 Precautions Be sure to observe the following to prevent the secondary troubles from happening: (1) Always unplug the AC power cord from the outlet when removing the covers and PCBs, adjusting the mechanisms, or conducting continuity testing with a circuit tester. (2) When disconnecting the connectors, do not pull the lead wires but hold the connector housings. (3) l Before handling the PCBs, touch a metal portion of the machine to discharge static electricity charged in your body. l When repairing the PCBs, handle them with extra care. After repairing the defective section, be sure to check again if the repaired section works correctly. Also record the troubleshooting procedure so that it would be of use for future trouble occurrence. 2.3 Checking prior to Troubleshooting Prior to proceeding to the troubleshooting procedures given in Subsection 2.4, make the following initial checks: Environmental conditions Check that: (1) The machine is placed on a flat, firm surface. (2) The machine is used in a clean environment at or near normal room temperature (10°C to 32.5°C) with normal relative humidity (20 to 80%). (3) The machine is not subjected to rapid change of the ambient temperature. (Moving the machine from a cold place to warm place will cause condensation inside the machine. If it takes place, leave the machine in the warm place for approx. two hours before turning on the power.) Powering on the machine with dew condensation will result in damaged electronic devices. (4) The machine is not exposed to direct sunlight or harmful gases. Power requirements Check that: (1) The power supply specified on the rating plate located on the bottom of the machine is used. The supply voltage stays within the rating ±10%. (2) Each voltage level on AC input lines and DC lines is correct. VI - 16