Specifications

— What is the quality of the printed page? If the printing is erratic
or skewed, check for a mechanical failure (Section 5.4). If it is
poor quality, perform the print-quality adjustment procedure in
Chapter 5.
• Check for audible indications:
— Did the audio alarm sound? Power down and then power up the
printer to see if the problem repeats (see Figure 5–1).
— Were there any unusual sounds (grinding, chattering, and so
forth)? Power down and then power up the printer to see if the
problem repeats (see Section 5.4).
Figure 5–1 is a troubleshooting tree flow chart that follows a logical
sequence to isolate a fault. Note that by removing the interface cable
the host is removed as a possible trouble source.
Table 5–1 is a list of faults and their possible causes. This table provides
a quick method of diagnosing printer faults of a more obvious nature.
The controls and indicators include the following:
— Outer control panel (for details, see the LG31 Printer Installa-
tion/Operator’s Manual)
— Inner control panel (for details, see the LG31 Printer Installa-
tion/Operator’s Manual)
— Power supply switch
— LEDs ON power supply board
— LEDs on logic boards
— Logic board potentiometers
— Logic board jumpers
5–2 TROUBLESHOOTING