Troubleshooting; Precautions; After Repairing - Brother P-touch PT-1180 Service Manual

3.3

TROUBLESHOOTING

This section gives the service personnel some of the troubleshooting procedures to be followed if
an error or malfunction occurs with the PT-1100/1130/1170/1180/11Q, PT-1250/1160 and ST-
1150. 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.
3.3.1

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 the PT-1100/1130/1170/1180/11Q, PT-1250/1160 and ST-1150
having problems from either a set of batteries or the AC adapter, make sure that its output
voltage level is 8 to 10V under no load.
(3) When supplying power from a stabilized power unit, use the power unit with approx. 3A
capacity and choose the output level of 7 to 9V.
When connecting it to the PT-1100/1130/1170/1180/11Q, PT-1250/1160 and ST-1150, be
careful with the polarity.
(4) When using a circuit tester for testing the conductivity, remove all of the batteries and the
AC adapter from the PT-1100/1130/1170/1180/11Q, PT-1250/1160 and ST-1150.
(5) To repair an error which occurred in the thermal head and its related sections, disconnect
the thermal head cable until repairs are finished.
3.3.2

After Repairing

After troubleshooting, be sure to check the failure to make sure that the failure has been
completely remedied. Note and keep the troubleshooting procedure acturally followed for later
troubleshooting.
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