Troubleshooting; Precautions; After Repairing - Brother P-touch 65 Service Manual

4.1 TROUBLESHOOTING

This section gives the service personnel some of the troubleshooting procedures to be
followed if an error or malfunction occurs with this machine. It is impossible to anticipate
all of the possible troubles which may occur in future and determine the troubleshooting
procedures, so this chapter covers some sample troubles. However, those samples will
help service personnel pinpoint and repair other defective elements if he/she analyzes
and examines them well.
4.1.1

Precautions

Be sure to observe the following precautions to prevent the secondary problems from
happening during troubleshooting:
(1) Get a good idea of what the trouble is. Whenever more than one trouble source is
found, plan the most reasonable repairing procedure after reviewing the relationship
between them.
(2) When supplying power to this machine having problems with either a set of batteries
or the AC line adapter, make sure that its output voltage level is 8 to 10V under no
load.
(3) When using a circuit tester for testing the conductivity, remove all of the batteries
(and disconnect the AC line adapter) from this machine.
(4) To repair an error which occurred in the thermal print head and its related sections,
disconnect the thermal head cable until repairs are finished.
4.1.2

After Repairing

After repairing the defective section, be sure to check again to see if the repaired section
works correctly. Also make a note of the troubleshooting procedure so that it will be
handy should problems occur in the future.
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