Brother PT-MT Service Manual - Page 39
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CHAPTER IV TROUBLESHOOTING
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, make sure that its output
voltage level is 8 to 10V under no load.
(3) When starting disassembly jobs, first remove dry cells and discharge electrolytic
capacitor C5.
(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. In particular, if you replace the main PCB, make a final operation check
given in CHAPTER III, Section 3.2, [ 6 ].
Make a note of the troubleshooting procedure so that it will be handy should problems
occur in the future.
IV - 1