Troubleshooting; Introduction; Precautions; Checking Prior To Troubleshooting - Brother MFC-3340CN Service Manual
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Also See for MFC-3340CN:
- Manual (231 pages) ,
- Manual de l'utilisateur (233 pages) ,
- User manual (220 pages)
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9.2 TROUBLESHOOTING
9.2.1 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.
9.2.2 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)
Before handling the PCBs, touch a metal portion of the machine to discharge static electricity
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charged in your body.
When repairing the PCBs, handle them with extra care.
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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.
9.2.3 Checking prior to Troubleshooting
Prior to proceeding to the troubleshooting procedures given in
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 35°C)
with normal relative humidity (20 to 80%).
(3) The machine is not exposed to direct sunlight or harmful gases.
Power requirements
Check that:
(1) The power supply specified on the rating plate on 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.
(3) All cables and harnesses are firmly connected.
(4) None of the fuses are blown.
9-25
Section 9.2.4,
make the following
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Troubleshooting
