Ioline FJ Printer, Service Manual

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Chapter 3: Troubleshooting & Testing
Mechanical, electrical, and
electronic diagnostics
Electrical problems
If, during power on, the printer experiences one or all of the follow-
ing, it may have a blown transistor:

Smoke coming from inside the machine.

The carriage won’t move.

The carriage hits the right or left side hard.

The carriage moves in only one direction.

Motors only move in one direction

A motor on the machine will try to keep turning after it stops.
The most common reason for a transistor to fail is a bad or old mo-
tor. As motors age, their bearings start to break down due to insuf-
fi cient lubrication. As this break-down happens the transistors have
to work harder to move the motor, causing them to heat up and
eventually fail. ( Figure 36 ).
In most cases, both the transistor and motor will need replacement.
Contact Ioline Tech Support for more detailed instructions on testing
a transistor.
Troubleshooting sensors
The printer uses the same sensor in multiple places for tracking pa-
per path status. The sensors are industrial-grade and will withstand
many years of use. If a sensor ever fails, the following conditions
might occur:
Figure 36. A good transitor on the left; the one on the right has failed. The presence of
solder bubbling out of the chip indicates it overheated.
Solder