Service manual

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EPSON LQ-300+ Revision C
Troubleshooting Troubleshooting 49
3.2.4 Unit and Parts Check
This section describes the checking method of the printhead, motors and sensors to find
the defective units and parts.
Table 3-9. Printing Operation is Abnormal When it is On-Line.
(Self-Test is Normal.)
Cause Check Point Y/N Solution
Initial setting is
wrong.
Check the initial
setting with the
default setting. Is it
OK?
NO
Reset the setting or use the EEPROM
clear to reset setting to the default.
Interface cable is
not connected
properly.
Are cables connected
properly?
NO Connect them properly.
Interface cable is
defective.
- - Replace the interface cable.
Main board is
defective.
- - Replace the main board.
Firmware is
defective.
Is the firmware
version latest?
NO Replace the firmware.
W A R N I N G
When repairing the unit, make sure to turn the printer off and plug
off the power cable except when this manual specifies to keep the
power on.