Precautions; Checking Prior To Troubleshooting - Brother CB200 Service Manual

5.2.3

Precautions

Be sure to observe the following to prevent the secondary troubles from happening:
(1) Always unplug the AC 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
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electricity 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.
5.2.4

Checking prior to Troubleshooting

Prior to proceeding to the troubleshooting procedures given in Subsection 5.2.5, 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
35 C) with normal relative humidity (45 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 printer 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.
Recording paper
Check that:
(1) A recommended type of recording paper is used.
(2) The recording paper is not dampened.
(3) The recording paper is not slack.
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