Specifications

Figure 5–1 is a troubleshooting flowchart that follows a logical sequence
to isolate a basic printer fault. The following notes refer to the marked
steps in the flowchart.
1. Communications problems are not dealt with by this flowchart and
can be investigated by:
a. Verifying the host and printer setup parameters (see the LG31
Printer Installation and Operator’s Guide). The LG31 hex-dump
facility can be of considerable use in the investigation of certain
communication and setup problems.
b. Using an alternative host communication port for input.
c. Changing the printer serial interface (SMSI).
2. Before removing power from the printer, note should be made of any
indicators and status information that will be lost when the printer is
switched off. The removal of the serial interface isolates the printer
from the host as a possible trouble source.
3. Note that the shuttle access cover interlock, when activated, will
cause the power supply LEDs to go out.
4. See section 3.6.
5. Note that a major malfunction of the SMSM could also cause a blank
control panel display.
6. See section 3.2.
7. See section 3.4.
8. See section 3.3. The printer initialization sequence should be used
first where appropriate to try and clear an error or where the control
panel is locked up and will lead back into the self test routine.
9. See section 3.2.3.
10. See Chapter 7.
5–4 TROUBLESHOOTING